JP2005101762A - High-frequency part and communication apparatus employing it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a high-frequency part capable of preventing a PCS/DCS transmission signal from being transmitted to a PCS-receiving terminal and a DCS-receiving terminal at PCS/DCS transmission. <P>SOLUTION: When a positive voltage control signal is inputted to the DCS/PCS transmission/reception switching control signal input terminal Vc2 of a switch circuit SW2, diodes D3 and D4 go to conductive state. Since the cathode of the switch circuit SW2 is connected to the anode side of a diode D6 in a switch circuit SW3 with a resistor element R0, the diode D6 also goes to conduction state. When the diodes D4 and D6 go to conductive state, transmission line DSL2 becomes substantially open state for a transmission signal, as viewed from the diode D3 and transmission line DSL3 becomes substantially open state, as viewed from the switch circuit SW2 side thus having specified isolation, respectively. Consequently, the transmission signal is attenuated on these transmission lines and will not be transmitted to a DCS-receiving signal output terminal Rx2. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention is a high-frequency component that handles transmission / reception signals of two communication systems each having a transmission / reception frequency band different from each other, in particular, the transmission signal band of the first communication system and the reception signal band of the second communication system partially match. The present invention also relates to a high-frequency component that can individually transmit and receive, and a communication device using this high-frequency component.

  Currently, there are a plurality of specifications such as a CDMA system and a TDMA system in a wireless communication system such as a cellular phone, and the TDMA system uses GSM using the 900 MHz band, DCS using the 1800 MHz band, and 1900 MHz band. There are PCS and the like. Among these, in PCS, 1850 to 1910 MHz is assigned as the frequency band of the transmission signal, and 1930 to 1990 MHz is assigned as the frequency band of the reception signal. In DCS, 1710 to 1785 MHz is assigned as the frequency band of the transmission signal, and 1805 to 1880 MHz is assigned as the frequency band of the reception signal.

  When communication signals of these three different communication systems (GSM, DCS, and PCS) are transmitted and received with one antenna, signals other than the frequency band for actual communication are not necessary. For example, when transmitting and receiving in the GMS system (900 MHz band), communication signals in the DCS system (1800 MHz band) and the PCS system (1900 MHz band) are unnecessary.

  As a high-frequency module that transmits and receives such GSM, DCS, and PCS communication signals with a single antenna, a diplexer that separates a GSM communication signal and a DCS / PCS communication signal that are greatly different in frequency band, a GSM transmission signal, and a GSM reception 2. Description of the Related Art Conventionally, a switch circuit that switches a signal, a switch circuit that switches a DCS / PCS transmission signal and a DCS / PCS reception signal, and a switch circuit that switches a DCS reception signal and a PCS reception signal has been proposed. (For example, refer to Patent Document 1).

  FIG. 9 is an equivalent circuit diagram of such a conventional high-frequency module. In the following description, a GSM transmission signal is input from a transmission signal input terminal Tx1, a GSM reception signal is output from a reception signal output terminal Rx1, and a transmission signal is transmitted. A case where a DCS transmission signal or a PCS transmission signal is input from the input terminal Tx2, a DCS reception signal is output from the reception signal output terminal Rx2, and a PCS reception signal is output from the reception signal output terminal Rx3 will be described.

  The diplexer DiPX210 is provided with three input / output units P41 to P43. The input / output unit P41 on the switch circuit SW101 side is connected to the input / output unit P43 on the antenna ANT side via the low-pass filter LPF202, and the input / output unit P43 is connected to the input / output unit P42 on the switch circuit SW102 side via the high-pass filter HPF203. It is connected to the.

  The low-pass filter LPF 202 includes a capacitor Ct1 connected between the input / output unit P41 and the input / output unit P43 and a parallel circuit of an inductor Lt1 including a transmission line, and the input / output unit P41 side of the parallel circuit and the ground. It consists of a connected capacitor Cu1. The high-pass filter HPF 203 includes capacitors Cc1 and Cc2 connected in series between the input / output unit P42 and the input / output unit P43, and a capacitor Ct2 connected between the connection point of the capacitors Cc1 and Cc2 and the ground. And an inductor Lt2 made of a transmission line.

  In the switch circuit SW101, the input / output unit P11 is connected to the GSM transmission signal input terminal Tx1 through the low pass filter LPF201, the input / output unit P12 is connected to the GSM reception signal output terminal Rx1, and the input / output unit P13 is connected to the diplexer DiPX210. Has been.

  The input / output unit P13 on the diplexer DiPX210 side is connected to the input / output unit P11 on the GSM transmission signal input terminal Tx1 side via the diode D1, and is connected to the transmission line GSL2 having a length of about ¼ of the wavelength of the GSM transmission signal. To the input / output unit P12 on the GSM reception signal output terminal Rx1 side. The end of the transmission line GSL2 on the input / output part P12 side is grounded via the diode D2 and the capacitor GC5.

  The diode D2 has a cathode connected to the transmission line GSL2, and an anode connected to the control signal input terminal Vc1 via the resistance element R1. The diode D1 has an anode connected to the input / output terminal P13 and the transmission line GSL2, and a cathode grounded through the inductor GSL1.

  The low-pass filter LPF201 has an input / output unit P51 connected to the input / output unit P11 of the switch circuit SW1, and an input / output unit P52 connected to the GSM transmission signal input terminal Tx1 via a capacitor. The low-pass filter LPF201 includes a capacitor GCc1 connected between the input / output units P51 and P52 and a parallel circuit of an inductor GLt1 including a transmission line, and a capacitor GCu1 connected between both ends of the parallel circuit and the ground. It consists of GCu2.

  In the switch circuit SW102, the input / output unit P21 is connected to the DCS / PCS transmission signal input terminal Tx2 via the low pass filter LPF204, the input / output unit P22 is connected to the switch circuit SW103 via the capacitor DPC0, and the input / output unit P23 is It is connected to the diplexer DiPX210.

  The input / output unit P23 on the diplexer DiPX210 side is connected to the input / output unit P21 on the DCS / PCS transmission signal input terminal Tx2 side via the diode D3, and has a length of about 1/4 of the wavelength of the DCS / PCS transmission signal. It is connected to the input / output unit P22 on the switch circuit SW3 side via the transmission line DSL2. The end of the transmission line DSL2 on the input / output part P22 side is grounded via a diode D4 and a capacitor DC4. In addition, a series circuit of a capacitor DPCt and an inductor DPSLt is connected to both ends of the diode D3, and an end on the input / output unit P21 side of the diode D3 is grounded via the inductor DPSL1 and the capacitor DPC1.

  The diode D3 has an anode connected to the control signal input terminal Vc2 via the inductor DPSL1, and a cathode connected to the transmission line DSL2. The anode of the diode D4 is connected to the transmission line DSL2, and the cathode is grounded together with the capacitor DC4 via the resistance element R2.

  In the switch circuit SW103, the input / output unit P31 is connected to the PCS reception signal output terminal Rx3 via a capacitor, the input / output unit P32 is connected to the DCS reception signal output terminal Rx2, and the input / output unit P33 is switched via the capacitor DPC0. It is connected to the circuit SW102.

  The input / output unit P33 on the switch circuit SW102 side is connected to the input / output unit P31 on the PCS reception signal output terminal Rx3 side via the diode D5, and the transmission line DSL3 having a length of about ¼ of the wavelength of the PCS reception signal. To the input / output unit P32 on the DCS reception signal output terminal Rx2 side. The end of the transmission line DSL3 on the input / output terminal P32 side is grounded via a diode D6 and a capacitor DC6. The end of the diode D5 on the input / output part P31 side is grounded via the inductor PSL3 and the capacitor PC3.

  The diode D5 has an anode connected to the control signal input terminal Vc3 via the inductor PSL3, and a cathode connected to the transmission line DSL3. The diode D6 has an anode connected to the transmission line DSL3 and a cathode connected to the ground together with the capacitor DC6 via the resistance element R3.

  The low-pass filter LPF204 has an input / output unit P61 connected to the input / output unit P21 of the switch circuit SW102, and an input / output unit P62 connected to the DCS / PCS transmission signal input terminal Tx2 via a capacitor. The low-pass filter LPF 204 includes a parallel circuit of a capacitor Ct3 and an inductor Lt3 composed of a transmission line, a parallel circuit of a capacitor Ct4 and an inductor Lt4 composed of a transmission line, and a parallel circuit of these parallel circuits. It consists of capacitors Cu2, Cu3, Cu4 respectively connected between both ends and the ground.

  An operation in the case of transmitting and receiving GSM, DCS, and PCS communication signals using such a conventional high-frequency module will be described. Here, the GSM communication signal is input from the transmission signal input terminal Tx1 and output from the reception signal output terminal Rx1, the DCS communication signal is input from the transmission signal input terminal Tx2 and output from the reception signal output terminal Rx2, and the PCS communication signal Indicates a case where the signal is input from the transmission signal input terminal Tx2 and output from the reception signal output terminal Rx3.

(1) During GSM transmission / reception When transmitting a GSM transmission signal, a positive voltage control signal is input to the control signal input terminal Vc1 of the switch circuit SW101.
When a positive voltage control signal is input from the control signal input terminal Vc1, the diodes D1 and D2 are turned on, and the GSM transmission signal input from the transmission signal input terminal Tx1 is transmitted to the anode side of the diode D1. Here, since the transmission line GSL2 has a line length of about 1/4 of the wavelength of the GSM transmission signal, the transmission line GSL2 rotates the phase with respect to the GSM transmission signal so that the reception signal output terminal Rx1 side is open, It functions as an isolation circuit having a predetermined isolation. For this reason, the GSM transmission signal is transmitted to the antenna ANT through the low pass filter LPF 202 of the diplexer DiPX 210, but is hardly transmitted to the reception signal output terminal Rx1 side.

On the other hand, when transmitting a GSM reception signal, a control signal of 0 voltage or negative voltage is input to the control signal input terminal Vc1.
When a 0-voltage or negative-voltage control signal is input to the control signal input terminal Vc1, the diodes D1 and D2 are opened. When the diode D1 is opened, the GSM reception signal from the antenna ANT is transmitted to the transmission line GSL2, but is blocked by the diode D1 and is not transmitted to the transmission signal input terminal Tx1 side. On the other hand, since the diode D2 is open, the transmission line GSL2 functions as a mere transmission line for the GSM reception signal, so that the GSM reception signal is transmitted to the reception signal output terminal Rx1.

(2) DCS / PCS transmission When transmitting a DCS transmission signal or a PCS transmission signal, a positive voltage control signal is input to the control signal input terminal Vc2 of the switch circuit SW102.

  When a positive voltage control signal is input from the control signal input terminal Vc2, a current flows to the ground via the diode D3, the transmission line DSL2, the diode D4, and the resistance element R2. As a result, the diodes D3 and D4 of the switch circuit SW102 become conductive. When the diode D3 becomes conductive, the input / output unit P21 and the input / output unit P23 of the switch circuit SW102 are conductive. Thereby, the DCS transmission signal or the PCS transmission signal input from the DCS / PCS transmission signal input terminal Tx2 is input from the input / output unit P21 to the switch circuit SW102 via the low-pass filter LPF204, and input / output unit via the diode D3. The data is transmitted from P23 to the antenna ANT via the diplexer DiPX210.

  On the other hand, when the diode D4 becomes conductive, the end of the transmission line DSL2 on the input / output part P22 side is equivalently grounded by the diode D4 and the capacitor DC4. Here, since the transmission line DSL2 has a line length of about 1/4 of the wavelength of the DCS / PCS transmission signal, the transmission line DSL2 side viewed from the cathode of the diode D3 is substantially open, and the transmission line DSL2 is connected to the input / output unit from the transmission line DSL2. The circuit on the P22 side functions as an isolation circuit having a predetermined attenuation. Thereby, the DCS or PCS transmission signal transmitted to the transmission line DSL2 side is attenuated by the isolation circuit and hardly transmitted to the switch circuit SW103 side, that is, the reception signal output terminal side.

(3) During PCS reception When transmitting a PCS reception signal, a control signal of 0 voltage or negative voltage is input to the control signal input terminal Vc2 of the switch circuit SW102. Further, a positive voltage control signal is input to the control signal input terminal Vc3 of the switch circuit SW103.

  When a control signal of 0 voltage or negative voltage is input to the control signal input terminal Vc2, the diodes D3 and D4 of the switch circuit SW102 are opened, and the diode D3 side is opened when viewed from the input / output unit P23 of the switch circuit SW102. Become. On the other hand, since the end of the transmission line DSL2 on the diode D4 side is not short-circuited equivalently when the diode D4 is opened, the transmission line DSL2 functions as a simple transmission line, and the input / output unit P23 of the switch circuit SW102. And the input / output unit P22 are conducted. Thus, the PCS reception signal received by the antenna ANT and input to the input / output unit P23 of the switch circuit SW102 via the diplexer DiPX210 is transmitted to the input / output unit P33 of the switch circuit SW103 via the transmission line DSL2 and the input / output unit P22. Although transmitted, it is not transmitted to the DCS / PCS transmission signal input terminal Tx2.

  On the other hand, in the switch circuit SW103, when a positive voltage control signal is input to the control signal input terminal Vc3, a current flows to the ground via the diode D5, the transmission line DSL3, the diode D6, and the resistance element R3. As a result, the diodes D5 and D6 of the switch circuit SW103 are turned on, and the input / output unit P31 and the input / output unit P33 of the switch circuit SW103 are conducted. Thereby, the PCS reception signal input to the input / output unit P33 is transmitted to the PCS reception signal output terminal Rx3 via the input / output unit P31. At this time, since the transmission line DSL3 is formed with a line length of ¼ of the wavelength of the PCS reception signal, the diode D6 side of the transmission line DSL3 is short-circuited, and the PCS reception signal is viewed from the input / output unit P33. Thus, the transmission line DSL3 side is opened. As a result, since the circuit on the input / output unit P32 side from the transmission line DSL3 functions as an isolation circuit having a predetermined attenuation amount, the PCS reception signal transmitted to the transmission line DSL3 is attenuated by this isolation circuit and received by DCS. Almost no signal is transmitted to the signal output terminal side Rx2. However, since the isolation circuit including the transmission line DSL3 cannot completely block the PCS reception signal, the frequency band of the DCS reception signal is defined as a pass band between the transmission line DSL3 and the DCS reception signal output terminal Rx2. The PCS reception signal is prevented from being transmitted to the DCS reception signal output terminal Rx2. At this time, since the PCS reception signal has a smaller power than the transmission signal, the SAW filter is not destroyed.

  In this way, at the time of PCS reception, the PCS reception signal received by the antenna ANT can be transmitted only to the PCS reception signal output terminal Rx3.

(4) At the time of DCS reception When transmitting a DCS reception signal, a control signal of 0 voltage or negative voltage is input to both the control signal input terminal Vc2 of the switch circuit SW102 and the control signal input terminal Vc3 of the switch circuit SW103.

  When a control signal of 0 voltage or negative voltage is input to the control signal input terminal Vc2, the diode D3 of the switch circuit SW102 is opened, and the diode D3 side is opened as viewed from the input / output unit P23 of the switch circuit SW102. On the other hand, since the end of the transmission line DSL2 on the diode D4 side is not short-circuited equivalently when the diode D4 is opened, the transmission line DSL2 functions as a simple transmission line, and the input / output unit P23 of the switch circuit SW102. And P22 conduct. Thus, the DCS reception signal received by the antenna ANT and input to the input / output unit P23 of the switch circuit SW102 via the diplexer DiPX210 is transmitted to the input / output unit P33 of the switch circuit SW103 via the transmission line DSL2 and the input / output unit P22. Although transmitted, it is not transmitted to the DCS / PCS transmission signal input terminal Tx2.

  On the other hand, in the switch circuit SW103, when the control signal of 0 voltage or negative voltage is input to the control signal input terminal Vc3, the diodes D5 and D6 of the switch circuit SW103 are opened. When the diode D5 is opened, the diode D5 side is opened as viewed from the input / output unit P33 of the switch circuit SW103. Further, since the diode D6 is in an open state, the end of the transmission line DSL3 on the diode D6 side is not short-circuited equivalently, so that the transmission line DSL3 functions as a simple transmission line. Thus, the DCS reception signal input to the input / output unit P33 is transmitted to the DCS reception signal output terminal Rx2 via the transmission line DSL3 and the input / output unit P32, but is not transmitted to the PCS reception signal output terminal Rx3.

In this way, at the time of DCS reception, the DCS reception signal received by the antenna ANT is transmitted only to the DCS reception signal output terminal Rx2.
JP 2000-165288 A

  However, in the conventional high-frequency module shown in FIG. 9, the transmission line DSL2 side is not in an ideal open state when viewed from the cathode of the diode D3 with the diodes D3 and D4 of the switch circuit SW102 made conductive. The / DCS transmission signal slightly leaks to the switch circuit SW103. Here, when a positive voltage is applied to the control signal input terminal Vc3, the diode D5 becomes conductive, and the leaked transmission signal is transmitted to the reception signal output terminal Rx3. Accordingly, there is a possibility that a circuit element such as an LNA connected to the reception signal output terminal Rx3 is destroyed. The transmission line DSL3 has a line length that is ¼ of the wavelength of the PCS reception signal, and does not necessarily match the line length of ¼ of the wavelength of the DCS / PCS transmission signal, but the frequency of these signals is close. When a positive voltage is applied to the control signal input terminal Vc3 and the diode D6 becomes conductive, the input / output unit P32 side from the transmission line DSL3 functions as an isolation circuit, and the DCS / PCS transmission signal is attenuated to some extent. There is almost no leakage to the reception signal output terminal Rx2.

  On the other hand, when a zero voltage or a negative voltage is input to the control signal input terminal Vc3, the diodes D5 and D6 are opened. When the diode D5 is opened, no DCS / PCS transmission signal is transmitted to the reception signal output terminal Rx3. However, when the diode D6 is opened, the transmission line DSL3 functions as a mere transmission line for the DCS / PCS transmission signal. Therefore, the DCS / PCS transmission signal is transmitted to the reception signal output terminal Rx2. In order to prevent this, a SAW filter that passes only the frequency band of the DCS reception signal may be inserted between the transmission line DSL3 and the reception signal output terminal Rx2. However, since the transmission signal has a higher power than the reception signal, the SAW filter The possibility of destroying the filter arises.

  Further, as described above, the frequency band of the PCS transmission signal and the frequency band of the DCS reception signal partially overlap. Specifically, the frequency bands of 1850 to 1880 MHz overlap. Therefore, even if a SAW filter that passes the DCS reception signal frequency band is inserted between the transmission line DSL3 and the reception signal output terminal Rx2, even if this SAW filter is not destroyed, a part of the PCS transmission signal is not transmitted during PCS transmission. It is transmitted to the reception signal output terminal Rx2. Accordingly, there is a possibility that a circuit element such as an LNA connected to the reception signal output terminal Rx2 is destroyed.

  An object of the present invention is to prevent a transmission signal from being transmitted to a reception signal output terminal of one of the communication systems when transmitting one of the two communication systems having an individual frequency band as a transmission / reception band. An object of the present invention is to provide a high-frequency component and a communication device using the same.

In the present invention, transmission / reception signal input / output units to which transmission signals of the first and second communication systems each having an individual frequency band as a transmission / reception band are output and each reception signal is input, and each transmission signal is input. A first switch element connected between the transmission / reception signal input / output unit and the transmission signal input unit, the transmission / reception signal input unit and the reception A first transmission line having a predetermined length connected between the signal output unit and a second switch element connected between a connection point between the first transmission line and the reception signal output unit and the ground; A first switch circuit that simultaneously turns on or off the first switch element and the second switch element by a first control signal to switch the connection between the transmission / reception signal input / output unit and the transmission signal input unit or the reception signal output unit;
A reception signal input unit connected to the reception signal output unit of the first switch circuit, a first reception signal output unit that outputs a reception signal of the first communication system, and a second that outputs a reception signal of the second communication system A third switching element connected between the received signal input unit and the first received signal output unit, and connected between the received signal input unit and the second received signal output unit. A second transmission line having a predetermined length; and a fourth switch element connected between a connection point between the second transmission line and the second received signal output unit and the ground, and the third switch element by a second control signal And a fourth switch element that simultaneously controls on or off, and a second switch circuit that switches a connection between the received signal input unit and the first received signal output unit or the second received signal output unit. , Turn on the first switch circuit It is characterized in that the first control signal with a control signal path to provide a signal of the fourth on control to the switch element.

  In addition, the present invention is characterized in that the transmission signal frequency band of the first communication system and the reception signal frequency band of the second communication system partially overlap.

  In this configuration, since the first control signal is also transmitted to the fourth switch element of the second switch circuit via the control signal path, the first switch element, the second switch element, and the fourth switch element are simultaneously turned on or off. Be controlled.

  Using this control operation, on-control is performed so that the first switch element, the second switch element, and the fourth switch element are in a conductive state during transmission signal transmission.

  When the first switch element is turned on, the transmission signal input unit and the transmission / reception signal input / output unit are conducted in the first switch circuit, and the transmission signal is transmitted from the transmission signal input unit to the transmission / reception signal output unit. On the other hand, by setting the first transmission line of the first switch circuit to a length of about ¼ of the wavelength of the transmission signal in advance, the second switch element becomes conductive, so that The end on the second switch element side is equivalently grounded, and the end on the transmission / reception signal input / output unit side of the first transmission line is substantially open when viewed from the transmission / reception signal input unit side with respect to the transmission signal. Also, setting the second transmission line of the second switch circuit to a length of about ¼ of the wavelength of the reception signal of the first communication system that is close to the frequency of the transmission signal in advance, By being in the conductive state, the end of the second transmission line on the fourth switch element side is equivalently grounded, and the end of the second transmission line on the first switch circuit side is the first switch with respect to the transmission signal. The circuit is substantially open when viewed from the circuit side. As a result, even if the transmission signal frequency band of the first communication system and the reception signal frequency band of the second communication system partially coincide with each other, the first switch circuit and the second switch circuit have two stages. Since the transmission signal of one communication system is attenuated, leakage of the transmission signal of the first communication system to the reception signal output unit that outputs the reception signal of the second communication system is greatly suppressed.

  Further, according to the present invention, the first to fourth switching elements are respectively composed of first to fourth diodes, and the first diode and the second diode are connected in series with respect to the direct current path, The three diodes and the fourth diode are connected in series with respect to the DC current path, and the first switch circuit is ON / OFF controlled by the presence or absence of the DC current flowing through the first diode and the second diode by the first control signal, The second switch circuit is configured to be turned on or off by the presence or absence of a direct current flowing through the third diode and the fourth diode by the second control signal, and any one of the first diode and the second diode connected in series. The control signal path by connecting the end of the terminal and the connection point of the third diode and the fourth diode connected in series. It is characterized in that the configuration was.

  Further, according to the present invention, the first to fourth switch elements are respectively composed of first to fourth diodes, the cathode of the first diode is connected to the transmission / reception signal input / output unit of the first switch circuit, and the second diode The anode of the third diode is connected to the first transmission line, the cathode of the third diode is connected to the reception signal input section of the second switch circuit, the anode of the fourth diode is connected to the second transmission line, and the first diode A first control signal input section for controlling the first switch circuit on the anode side; a second control signal input section for controlling the second switch circuit on the anode side of the third diode; and a cathode of the second diode; A control signal path is configured by connecting a control signal path resistance element to the anode side of the fourth diode.

  Further, according to the present invention, the first to fourth switch elements are respectively composed of first to fourth diodes, the anode of the first diode is connected to the transmission / reception signal input / output unit of the first switch circuit, and the second diode The cathode of the third diode is connected to the first transmission line, the cathode of the third diode is connected to the reception signal input section of the second switch circuit, the anode of the fourth diode is connected to the second transmission line, and the second diode A control signal input unit for controlling each switch circuit is provided on each of the anode side and the anode side of the third diode, and a control signal path resistance element is connected between the cathode of the first diode and the anode side of the fourth diode. Thus, a control signal path is configured.

  In these configurations, since the first control signal is also transmitted to the fourth diode of the second switch circuit via the control signal path including the resistance element, the first diode, the second diode, and the fourth diode are simultaneously controlled. .

  Using this control operation, control is performed so that the first diode, the second diode, and the fourth diode are in a conductive state during transmission signal transmission.

  When the first diode is turned on, the transmission signal input unit and the transmission / reception signal input / output unit conduct in the first switch circuit, and the transmission signal is transmitted from the transmission signal input unit to the transmission / reception signal output unit. On the other hand, the first transmission line of the first switch circuit is set in advance to a length of about ¼ of the wavelength of the transmission signal, and the second diode becomes conductive, so that the first transmission line The end on the two diode side is equivalently grounded, and the end on the transmission / reception signal input / output unit side of the first transmission line is substantially open when viewed from the transmission / reception signal input unit side with respect to the transmission signal. Also, if the second transmission line of the second switch circuit is set in advance to a length of about ¼ of the wavelength of the received signal of the first communication system close to the frequency of the transmitted signal, the fourth diode becomes conductive. As a result, the end of the second transmission line on the fourth diode side is equivalently grounded, and the end of the second transmission line on the first switch circuit side is on the first switch circuit side with respect to the transmission signal. It will be in a substantially open state as seen from. Thereby, even if the transmission signal frequency band of the first communication system and the reception signal frequency band of the second communication system partially match, the first communication is performed in two stages of the first switch circuit and the second switch circuit. Since the transmission signal of the system is attenuated, transmission of the transmission signal of the first communication system to the reception signal output unit that outputs the reception signal of the second communication system is greatly suppressed.

  The present invention also provides a first control signal resistance element connected between the cathode of the second diode and the ground for energizing the first control signal, and a fourth diode for energizing the second control signal. A second control signal resistance element connected between the cathode and the ground, and the resistance value of the control signal path resistance element is within a range in which the fourth diode can be operated by the first control signal. It is characterized by being larger than the resistance value of the control signal resistance element.

  The present invention also provides a first control signal resistance element connected between the cathode of the first diode and the ground for energizing the first control signal, and a fourth diode for energizing the second control signal. A second control signal resistance element connected between the cathode and the ground, and the resistance value of the control signal path resistance element is within a range in which the fourth diode can be operated by the first control signal. It is characterized by being larger than the resistance value of the control signal resistance element.

  In these configurations, in each of the above-described high-frequency components, the current amount of the first control signal flowing to the fourth diode side via the control signal path resistance element is reduced, and current consumption is suppressed. Further, the second control signal of the second switch circuit is prevented from flowing to the first switch circuit side via the control signal path resistance element, and does not affect the control of the second switch circuit that switches the received signal. .

  The communication device of the present invention is characterized in that any one of the high-frequency components is provided in a front end portion.

  In this configuration, two communication systems in which the frequency band of one transmission signal and the frequency band of the other reception signal partially overlap are transmitted and received by one high-frequency component, and the transmission signal wraps around the reception signal transmission system. Therefore, a small communication device having excellent communication characteristics is configured.

  According to the high frequency component of the present invention, when transmitting and receiving two communication systems in which the frequency band of one transmission signal partially overlaps the frequency band of the other reception signal, the transmission signal to the reception signal output terminal is transmitted. The wraparound can be significantly suppressed, and the destruction of the circuit element connected to the reception signal output terminal due to the transmission signal can be prevented.

  Further, according to the high frequency component of the present invention, in addition to the above effects, the amount of current consumption can be suppressed, and the control of the second switch circuit can be stabilized.

  In addition, according to the communication device of the present invention, since the sneaking of the transmission signal to the reception signal transmission system is significantly suppressed, the communication characteristics can be greatly improved.

A high-frequency module that transmits and receives three types of communication systems including the high-frequency component according to the first embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is an equivalent circuit diagram of the high-frequency module according to the present embodiment. In the following description, a GSM transmission signal is input from a transmission signal input terminal Tx1, a GSM reception signal is output from a reception signal output terminal Rx1, and a transmission signal A case where a DCS transmission signal or a PCS transmission signal is input from the input terminal Tx2, a DCS reception signal is output from the reception signal output terminal Rx2, and a PCS reception signal is output from the reception signal output terminal Rx3 will be described.

  The diplexer DiPX25 is provided with three input / output units P41 to P43. The input / output unit P41 on the switch circuit SW1 side is connected to the input / output unit P43 on the antenna ANT side via the low pass filter LPF22, and the input / output unit P43 is connected to the switch circuit SW2 on the high pass filter HPF23 side. It is connected to the.

  The low-pass filter LPF22 includes a capacitor Ct1 connected between the input / output unit P41 and the input / output unit P43 and a parallel circuit of an inductor Lt1 including a transmission line, and the input / output unit P41 side of the parallel circuit and the ground. It consists of a connected capacitor Cu1. The high pass filter HPF23 includes capacitors Cc1 and Cc2 connected in series between the input / output unit P42 and the input / output unit P43, and a capacitor Ct2 connected between the connection point of the capacitors Cc1 and Cc2 and the ground. And an inductor Lt2 made of a transmission line.

  The switch circuit SW1 includes an input / output unit P11 connected to the GSM transmission signal input terminal Tx1 through the low-pass filter LPF21, an input / output unit P12 connected to the GSM reception signal output terminal Rx1, and an input / output unit P13 connected to the diplexer DiPX25. And are provided.

  The input / output unit P13 on the diplexer DiPX25 side is connected to the input / output unit P11 on the GSM transmission signal input terminal Tx1 side via the diode D1, and the transmission line GSL2 having a length of about ¼ of the wavelength of the GSM transmission signal is connected to the input / output unit P13. To the input / output unit P12 on the GSM reception signal output terminal Rx1 side. The end of the transmission line GSL2 on the input / output part P12 side is grounded via a diode D2 and a capacitor GC5.

  The diode D2 has a cathode connected to the transmission line GSL2, and an anode connected to the GSM transmission / reception switching control signal input terminal Vc1 via the resistor element R1. The diode D1 has an anode connected to the input / output terminal P13 and the transmission line GSL2, and a cathode grounded through the inductor GSL1.

  The low-pass filter LPF21 has an input / output unit P51 connected to the input / output unit P11 of the switch circuit SW1, and an input / output unit P52 connected to the GSM transmission signal input terminal Tx1 via a capacitor. The low-pass filter LPF21 includes a parallel circuit of a capacitor GCc1 connected between the input / output units P51 and P52 and an inductor GLt1 including a transmission line, and a capacitor GCu1 connected between both ends of the parallel circuit and the ground. It consists of GCu2.

  The switch circuit SW2 is connected to the DCS / PCS transmission signal input terminal Tx2 through the low pass filter LPF24, connected to the input / output unit P22 connected to the switch circuit SW3 through the capacitor DPC0, and connected to the diplexer DiPX25. An input / output unit P23 is provided. Here, the switch circuits SW2 and SW3 correspond to the first switch circuit and the second switch circuit of the present invention, respectively, and the input / output units P21, P22, and P23 respectively represent the transmission signal input unit, the reception signal output unit, and the present invention. It corresponds to a transmission / reception signal input / output unit.

  The input / output unit P23 on the diplexer DiPX25 side is connected to the input / output unit P21 on the DCS / PCS transmission signal input terminal Tx2 side via the diode D3, and has a length of about ¼ of the wavelength of the DCS / PCS transmission signal. It is connected to the input / output unit P22 on the switch circuit SW3 side via the transmission line DSL2. The end of the transmission line DSL2 on the input / output part P22 side is grounded via a diode D4 and a capacitor GC5. In addition, a series circuit of a capacitor DPCt and an inductor DPSLt is connected to both ends of the diode D3, and an end portion on the input / output unit P21 side of the diode D3 is grounded through the inductor DPSL1 and the capacitor DPC1. Here, the transmission line DSL2 corresponds to the first transmission line of the present invention, and the diodes D3 and D4 correspond to the first switch element and the second switch element of the present invention, respectively.

  The diode D3 has an anode connected to the DCS / PCS transmission / reception switching control signal input terminal Vc2 via the inductor DPSL1, and a cathode connected to the transmission line DSL2. The anode of the diode D4 is connected to the transmission line DSL2, and the cathode is grounded together with the capacitor DC4 via the resistance element R2. Here, the DCS / PCS transmission / reception switching control signal input terminal Vc2 corresponds to the first control signal input section of the present invention.

  Furthermore, the cathode of the diode D4 is connected to the connection point between the transmission line DSL3 and the diode D5 of the switch circuit SW3 via the resistance element R0. From the diode D4 to the transmission line DSL3 via the resistance element R0 corresponds to the control signal path of the present invention.

  The switch circuit SW3 is connected to an input / output unit P31 connected to the PCS reception signal output terminal Rx3 via a capacitor, an input / output unit P32 connected to the DCS reception signal output terminal Rx2, and connected to the switch circuit SW2 via a capacitor DPC0. An input / output unit P33 is provided. Here, the input / output units P31, P32, and P33 correspond to the first received signal output unit, the second received signal output unit, and the received signal input / output unit of the present invention, respectively.

  The input / output unit P33 on the switch circuit SW2 side is connected to the input / output unit P31 on the PCS reception signal output terminal Rx3 side via the diode D5, and the transmission line DSL3 having a length of about ¼ of the wavelength of the PCS reception signal. To the input / output unit P32 on the DCS reception signal output terminal Rx2 side. The end of the transmission line DSL3 on the input / output terminal P32 side is grounded via a diode D6 and a capacitor DC6. The input / output part P31 side end of the diode D5 is grounded via the inductor PSL3 and the capacitor PC3. Here, the transmission line DSL3 corresponds to the second transmission line of the present invention, and the diodes D5 and D6 correspond to the third switch element and the fourth switch element of the present invention, respectively.

  The diode D5 has an anode connected to the DCS / PCS reception switching control signal input terminal Vc3 via the inductor PSL3, and a cathode connected to the transmission line DSL3. The diode D6 has an anode connected to the transmission line DSL3 and a cathode connected to the ground together with the capacitor DC6 via the resistance element R3. Here, the DCS / PCS reception switching control signal input terminal Vc3 corresponds to the second control signal input section of the present invention.

  And the part comprised by these switch circuits SW2 and SW3 and resistance element R0 is equivalent to the high frequency component of this invention.

  The low-pass filter LPF24 has an input / output unit P61 connected to the input / output unit P21 of the switch circuit SW2, and an input / output unit P62 connected to the DCS / PCS transmission signal input terminal Tx2 via a capacitor. The low-pass filter LPF24 includes a parallel circuit of a capacitor Ct3 and an inductor Lt3 composed of a transmission line, a parallel circuit of a capacitor Ct4 and an inductor Lt4 composed of a transmission line, and a parallel circuit of these parallel circuits. It consists of capacitors Cu2, Cu3, Cu4 respectively connected between both ends and the ground.

  Next, the operation at the time of transmitting the DCS / PCS communication signal of this high frequency module will be described. Note that transmission / reception of GSM communication signals and reception of DCS / PCS communication signals are the same as those of the conventional high-frequency module shown in FIG.

  When transmitting a DCS transmission signal or a PCS transmission signal, a positive voltage control signal is input to the DCS / PCS transmission / reception switching control signal input terminal Vc2 of the switch circuit SW2. Further, a control signal of 0 voltage or negative voltage is input to the DCS / PCS reception switching control signal input terminal Vc3 of the switch circuit SW3. The control signal input to the DCS / PCS transmission / reception switching control signal input terminal Vc2 of the switch circuit SW2 corresponds to the first control signal of the present invention, and is input to the DCS / PCS reception switching control signal terminal Vc3 of the switch circuit SW3. This control signal corresponds to the second control signal of the present invention.

  When a positive voltage control signal is input from the DCS / PCS transmission / reception switching control signal input terminal Vc2, a current flows to the ground via the diode D3, the transmission line DSL2, the diode D4, and the resistance element R2, and the resistance from the diode D4 It also flows through the element R0. The current flowing through the resistance element R0 flows to the ground via the transmission line DSL3, the diode D6, and the resistance element R3. This means that the control signal for the switch circuit SW2 is also input to the diode D6 of the switch circuit SW3. As a result, the diodes D3 and D4 of the switch circuit SW2 and the diode D6 of the switch circuit SW2 become conductive. When the diode D3 becomes conductive, the input / output unit P21 and the input / output unit P23 of the switch circuit SW2 are conductive. Thus, the DCS transmission signal or PCS transmission signal input from the DCS / PCS transmission signal input terminal Tx2 is input from the input / output unit P21 to the switch circuit SW2 via the low-pass filter LPF24, and input / output unit via the diode D3. P23 is transmitted to the antenna ANT via the diplexer DiPX25. On the other hand, when the diode D4 becomes conductive, the end of the transmission line DSL2 on the input / output part P22 side is equivalently grounded by the diode D4 and the capacitor DC4. Here, since the transmission line DSL2 has a line length of about 1/4 of the wavelength of the DCS / PCS transmission signal, the transmission line DSL2 side viewed from the cathode of the diode D3 is substantially open, and the transmission line DSL2 is connected to the input / output unit from the transmission line DSL2. The circuit on the P22 side functions as an isolation circuit having a predetermined attenuation. Thereby, the DCS or PCS transmission signal transmitted to the transmission line DSL2 side is attenuated by this isolation circuit.

  However, the isolation circuit including the transmission line DSL2 alone is not completely attenuated, and a part of the DCS / PCS transmission signal is output from the input / output unit P22 and input to the input / output unit 33 of the switch circuit SW3.

  Here, since 0 voltage or negative voltage is input to the DCS / PCS reception switching control signal input terminal Vc3 of the switch circuit SW3, the diode D5 is in an open state, but the diode D6 is connected to the diode D6 via the resistance element R0. Since part of the current flowing through the diodes D3 and D4 of the switch circuit SW2 flows, the conductive state is established.

When the diode D5 is opened, the DCS / PCS transmission signal flowing into the switch circuit SW3 is blocked by the diode D5 and is not transmitted to the PCS reception signal output terminal Rx3.
On the other hand, when the diode D6 becomes conductive, the end of the transmission line DSL3 on the input / output part P32 side is equivalently grounded by the diode D6 and the capacitor DC6. The transmission line DSL3 has a line length of about ¼ of the wavelength of the PCS reception signal, but this is close to the line length of about ¼ of the wavelength of the DCS / PCS transmission signal, so transmission seen from the input / output unit P33. The line DSL2 side is substantially open to the frequency band of the DCS / PCS transmission signal, and the circuit on the input / output unit P32 side from the transmission line DSL3 of the switch circuit SW3 functions as an isolation circuit having a predetermined attenuation. As a result, the DCS / PCS transmission signal leaked from the input / output unit P22 of the switch circuit SW2 is attenuated again. Thus, since the isolation circuit including the transmission line DSL2 and the isolation circuit including the transmission line DSL3 are attenuated twice, the DCS / PCS transmission signal is almost transmitted to the DCS reception signal output terminal Rx2. Not.

  As a result, the DCS / PCS transmission signal is prevented from being transmitted to the circuit elements connected to the DCS reception signal output terminal Rx2, and destruction of these circuit elements can be prevented. Further, even when a SAW filter is inserted between the DCS reception signal output terminal Rx2 and the transmission line DSL3, even if a PCS transmission signal is input, the power is extremely small, so that the destruction of the SAW filter can be prevented. it can.

  When the DCS / PCS communication signal is received, the operation is the same as that of the conventional high-frequency module, and the description thereof is omitted. In the high-frequency module of the present invention, the resistor element R0 is connected between the switch circuit SW2 and the switch circuit SW3, and the possibility that the current due to the second control signal flows to the resistor element R2 via the resistor element R0 is not likely. Although there is no influence on the operation of the switch circuit SW2.

  The result of simulating the isolation characteristic (signal attenuation) between the DCS / PCS transmission signal input terminal Tx2 and the DCS reception signal output terminal Rx2 at the time of DCS / PCS transmission when such a high-frequency module is used. As shown in FIG.

  FIG. 2 is a graph showing a simulation result of an isolation characteristic between the DCS / PCS transmission signal input terminal Tx2 and the DCS reception signal output terminal Rx2, and (a) shows a simulation result of a conventional high-frequency module. ) Is a simulation result of the high-frequency module of the present invention. This simulation shows a case where a positive voltage is applied to the control signal input terminal Vc2, a zero voltage and a negative voltage are applied to the control signal input terminal Vc3. In performing this simulation, the high frequency module shown in the equivalent circuit diagram of FIG. 3 was used. The high-frequency module shown in FIG. 3 connects the inductor Ls2 and the SAW filter SAW2 between the transmission line DSL3 and the DCS reception signal output terminal Rx2 of the high-frequency module shown in FIG. 1, and the input / output unit of the transmission line DSL3. A matching capacitor Cj is connected between the P33 side and the ground. Although not directly related to this characteristic, the SAW filter SAW1 is also connected between the transmission line GSL2 and the GSM reception signal output terminal Rx1.

  As shown in FIG. 2, the isolation of the PCS transmission signal band (1850 to 1910 MHz) can be significantly improved by adopting the configuration of the high frequency module of the present invention.

Next, the structure of the multilayer substrate type high-frequency module having the above-described function will be described with reference to FIGS. The laminated substrate type high-frequency module described below is obtained by eliminating the low-pass filters LPF 21 and 24 of the equivalent circuit shown in FIG.
4 and 5 are diagrams showing specific examples of each layer of the multilayer substrate type high-frequency module.
The multilayer substrate type high-frequency module is formed by sequentially laminating the dielectric layers 51 to 69 shown in FIGS. However, each figure of FIG. 4, FIG. 5 represents the state which looked at each dielectric material layer 51-69 from the lower surface side (side facing a mounting board | substrate), respectively. The symbols shown in FIGS. 4 and 5 correspond to the symbols of the respective elements shown in FIG.

On the lowermost dielectric layer 51, various external terminals for mounting on a mounting substrate are formed. Here, GND is a ground terminal (ground terminal).
A common ground electrode GND is formed on the dielectric layer 52, and a counter electrode of a capacitor indicated by PC3, DCu2 and DPC1 is formed on the dielectric layer 53.

  A common ground electrode GND is formed on the dielectric layer 54, and a counter electrode of a capacitor indicated by DC4, PC6, GC5, DCu1, GCu1, GCu2, Cu1, and Ct2 is formed on the dielectric layer 55. .

  The dielectric layer 56 is formed with a common ground electrode GND and a counter electrode of a capacitor indicated by PC3, the dielectric layer 57 is provided with a counter electrode of a capacitor indicated by Cj, and the dielectric layer 58 has a through electrode. Only holes are formed.

  On the dielectric layer 59, transmission lines indicated by DSL2, DSL3, GSL2 and inductor electrodes indicated by PSL3, DLt1, DLt2, GLt1, Lt1, Lt2, DPSLt are formed.

  The dielectric layer 60 is formed with inductor electrodes indicated by PSL3, GSL2, Lt1, and DPSLt. The dielectric layer 61 is provided with transmission lines indicated by DSL2, DSL3, and GSL2, and PSL3, DLt1, DLt2, Glt1, and Lt2. , DPSLt, inductor electrodes are formed.

  The dielectric layer 62 is formed with inductor electrodes indicated by PSL3, GSL2, Lt1, and DPSLt. The dielectric layer 63 is provided with transmission lines indicated by DSL2, DSL3, and GSL2, and PSL3, DLt1, DLt2, Glt1, and Lt1. , Lt2 and DPSLt, inductor electrodes are formed.

  The dielectric layer 64 is formed with counter electrodes of capacitors indicated by DPC0, DPCt, Ct1, and DCc2, and the dielectric layer 65 is formed with capacitors indicated by DPC0, DPCt, Ct1, Cc1, and DCc2.

  On the dielectric layer 66, counter electrodes of capacitors indicated by DPC0, DPCt, GCc1, DCc2, Cc1, and Cc2 are formed. On the dielectric layer 67, counter electrodes of capacitors indicated by DPC0, DPCt, Cc2, DCc2, and GCc1 are formed. The ground electrode GND is formed, and the dielectric layer 68 is formed with a wiring pattern electrode.

  On the uppermost dielectric layer 69, mounting electrodes for various mounting parts are formed. Dual SAW filters, diodes D1 to D6, resistance elements R0, R1 to R3, inductors DPSL1, GSL1, Ls2, Lant, Lr1, Lr2, and a capacitor Cant are mounted at these predetermined positions.

  Thus, by forming with a laminated substrate, the above-mentioned high frequency module can be formed in a small size and can be constituted as one component.

Next, a high-frequency module according to the second embodiment will be described with reference to FIG.
FIG. 6 is an equivalent circuit diagram of the high-frequency module according to the present embodiment.
In the high-frequency module shown in FIG. 6, the other end of the resistance element R0 having one end connected to the cathode of the diode D4 of the switch circuit SW2 is directly connected to the anode of the diode D6 of the switch circuit SW3. This is the same as the high frequency module shown in FIG. Even in such a configuration, the same effects as those of the first embodiment can be obtained.

Next, a high frequency module according to a third embodiment will be described with reference to FIG.
FIG. 7 is an equivalent circuit diagram of the high-frequency module according to the present embodiment.
In the high-frequency module shown in FIG. 7, the polarity of the diodes D3 and D4 of the switch circuit SW2 is reversed, and the DCS / PCS transmission / reception switching control signal input terminal Vc2 is connected to the anode of the diode D4 via the inductor DSPL1. A resistance element R2 is connected between the cathode of D3 and the ground. Further, a resistance element R0 is connected between the cathode of the diode D3 of the switch circuit SW2 and the diode D5 side of the transmission line DSL3 of the switch circuit SW3.
Even in such a configuration, the same effects as those of the first embodiment can be obtained.

  The resistance value of the resistance element R0 in each of the above-described embodiments is not particularly specified as long as the current from the switch circuit SW1 flows through the diode D6, but is the minimum necessary for controlling the state of the diode D6. By setting the resistance value of the resistance element R0 so that a limited current flows, current consumption flowing through the resistance element R0 can be suppressed. Further, by setting the resistance element R0 to such a resistance value, the control signal of the switch circuit SW3 can be prevented from flowing into the switch circuit SW2, and the control of the switch circuit SW3 can be stabilized.

  In each of the embodiments described above, a diode is used as each switch element, and the control signal is supplied between the anode and cathode of the diode. However, an element having a control input terminal such as an FET is used as the switch element. May be used. In this case, the “control signal path” according to the present invention is such that the “first control signal” for controlling the first and second switch elements to be turned on is the “second control signal” and the “fourth switch element” is in the off state. What is necessary is just to provide so that a "4th switch element" may be forcibly turned on to a control input terminal.

Next, a communication device including the above-described high frequency module will be described with reference to FIG.
FIG. 8 is a block diagram showing the main part of the communication apparatus.
As shown in FIG. 8, the communication device generates an antenna 81 that transmits and receives GSM, PCS, and DCS communication signals, a front-end unit 82 that separates the three types of communication signals, generates a transmission signal, and demodulates the reception signal. A transmission / reception circuit 83, a user interface key 87, a speaker 85, and a microphone 86, and a baseband controller 84 that controls signals between the transmission / reception circuit 83 and each of the user interfaces. The above-described high-frequency module is used for the front end portion 82.

  By adopting such a configuration, it is not necessary to provide separation means for each of the three types of communication signals using different frequency bands, and a small communication device can be configured while having excellent communication characteristics. .

Equivalent circuit diagram of the high-frequency module according to the first embodiment The graph showing the simulation result of the isolation characteristic between DCS / PCS transmission signal input terminal Tx2 and DCS reception signal output terminal Rx2. Equivalent circuit diagram of the high-frequency module used in the simulation shown in FIG. The figure showing the specific example of each layer of a multilayer substrate type high frequency module The figure showing the specific example of each layer of a multilayer substrate type high frequency module Equivalent circuit diagram of the high-frequency module according to the second embodiment Equivalent circuit diagram of the high-frequency module according to the third embodiment Block diagram showing the main parts of the communication device Equivalent circuit diagram of conventional high-frequency module

Explanation of symbols

SW1, SW2, SW3, SW101, SW102, SW103—switch circuits LPF21, LPF22, LPF24, LPF201, LPF202, LPF204—lowpass filter HPF23, HPF203—highpass filter DiPX25, DiPX210—diplexer 51 to 69—multilayer substrate type high frequency module 81-antenna front end-82
Transceiver circuit-83
Baseband controller-84
Speaker-85
Mike-86
Key-87

Claims (8)

A transmission / reception signal input / output unit to which each transmission signal of the first and second communication systems each having an individual frequency band as a transmission / reception band is output and each reception signal is input, and a transmission signal input to which each transmission signal is input And a reception signal output unit for outputting each reception signal, a first switch element connected between the transmission / reception signal input / output unit and the transmission signal input unit, the transmission / reception signal input unit, and the A first transmission line having a predetermined length connected between the reception signal output unit and a second switch element connected between a connection point between the first transmission line and the reception signal output unit and the ground; The first switch element and the second switch element are simultaneously turned on or off by the first control signal to switch the connection between the transmission / reception signal input / output unit and the transmission signal input unit or the reception signal output unit. The And a latch circuit,
A reception signal input unit connected to the reception signal output unit of the first switch circuit, a first reception signal output unit that outputs a reception signal of the first communication system, and a first that outputs a reception signal of the second communication system A second received signal output unit, a third switch element connected between the received signal input unit and the first received signal output unit, and between the received signal input unit and the second received signal output unit A second transmission line having a predetermined length connected, and a fourth switch element connected between a connection point between the second transmission line and the second reception signal output unit and the ground, and a second control signal A second switch circuit that simultaneously switches on or off the third switch element and the fourth switch element to switch the connection between the reception signal input unit and the first reception signal output unit or the second reception signal output unit; In high frequency parts with
A high-frequency component, comprising: a control signal path that applies the first control signal for controlling the first switch circuit to the fourth switch element as an ON control signal. Each of the first to fourth switch elements includes first to fourth diodes;
The first diode and the second diode are connected in series with respect to the direct current path, and the third diode and the fourth diode are connected in series with respect to the direct current path,
The first switch circuit is turned on or off by the presence or absence of a direct current flowing through the first diode and the second diode by the first control signal, and the second switch circuit is turned on by the second control signal. And is configured to be turned on or off by the presence or absence of a direct current flowing through the fourth diode,
2. The control signal path is configured by connecting one end of the first diode and the second diode connected in series to the third diode and the fourth diode connected in series. High-frequency components as described. A cathode of the first diode is connected to the transmission / reception signal input / output unit of the first switch circuit;
An anode of the second diode is connected to the first transmission line;
A cathode of the third diode is connected to the reception signal input section of the second switch circuit;
The anode of the fourth diode is connected to the second transmission line;
An input portion for the first control signal on the anode side of the first diode; and an input portion for the second control signal on the anode side of the third diode;
The high-frequency component according to claim 2, wherein the control signal path is configured by connecting a resistance element for a control signal path between a cathode of the second diode and an anode side of the fourth diode. A first control signal resistance element connected between a cathode of the second diode and the ground for energizing the first control signal; and a cathode of the fourth diode for energizing the second control signal. And a second control signal resistance element connected between the ground and the ground,
4. The high frequency according to claim 3, wherein a resistance value of the resistance element for the control signal path is set larger than a resistance value of the resistance element for the first control signal in a range in which the fourth diode can be operated by the first control signal. parts. An anode of the first diode is connected to the transmission / reception signal input / output unit of the first switch circuit;
A cathode of the second diode is connected to the first transmission line; a cathode of the third diode is connected to the reception signal input unit of the second switch circuit;
The anode of the fourth diode is connected to the second transmission line;
A control signal input section for controlling each switch circuit on each of the anode side of the second diode and the anode side of the third diode;
3. The high-frequency component according to claim 2, wherein a control signal path resistance element is connected between a cathode of the first diode and an anode side of the fourth diode to configure the control signal path. A first control signal resistance element connected between the cathode of the first diode and the ground for energizing the first control signal; and a cathode of the fourth diode for energizing the second control signal. And a second control signal resistance element connected between the ground and the ground,
6. The high frequency according to claim 5, wherein a resistance value of the control signal path resistance element is larger than a resistance value of the first control signal resistance element in a range in which the fourth diode can be operated by the first control signal. parts. The high-frequency component according to any one of claims 1 to 6, wherein the transmission signal frequency band of the first communication system and the reception signal frequency band of the second communication system partially overlap each other. The communication apparatus provided with the high frequency component as described in any one of Claims 1-7 in the front end part.

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