JP2012178645A - Radio communication device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compact, lightweight and inexpensive radio communication device using a plurality of antennas.SOLUTION: The radio communication device includes: a first circuit board 24 mounted with a first terminal section 28 including a plurality of terminals; a high frequency circuit 36 mounted on the first circuit board 24 and connected to the first terminal section 28; a second circuit board mounted with a second terminal section including a plurality of terminals; and a conductive section connecting the first terminal section 28 and the second terminal section. The plurality of terminals included in at least either of the first terminal section 28 and the second terminal section are interconnected via a capacitor 68, and the first terminal section 28 and the second terminal section serve as antennas for the high frequency circuit 36.

Description

  The present invention relates to a wireless communication apparatus.

  In recent years, a wireless communication device has been miniaturized and a wristwatch type has also appeared. Some have separate communication functions of different frequencies. For example, it is a device having a 2.4 GHz band communication function and a 1.575 GHz band GPS reception function. With such a device, position display and time display can be obtained in an outdoor environment. High-density mounting is indispensable for miniaturization and weight reduction, and an antenna structure is important for improving communication quality under severe communication environment.

  Also, in a small wireless communication device that performs separate communication at two frequencies, two antennas made of sheet metal are prepared, and a structure that increases the distance between the antennas to reduce interference between the antennas is shown. (For example, refer to Patent Document 1).

JP 2008-11016 A

  However, the structure of Patent Document 1 requires an antenna element made of sheet metal, and requires a means for connecting the high-frequency circuit and the antenna, and further restricts the antenna arrangement in order to reduce interference between the antennas. For this reason, it may be difficult to reduce the size, weight, and cost of the device.

  SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following forms or application examples.

  Application Example 1 A circuit board on which a terminal unit including a plurality of terminals is installed, a high-frequency circuit installed on the circuit board and connected to the terminal unit, a capacitor that connects between the terminals of the terminal unit, And the terminal part connected by the capacitor is an antenna of the high-frequency circuit.

  According to this, since the terminal portion connected by the capacitor functions as an antenna of the high-frequency circuit, an antenna element such as a chip antenna is not required, and an antenna connection means is also unnecessary, so that wireless communication using an antenna is possible. It is possible to reduce the size, weight and cost of the device.

  Moreover, generally the terminal part is installed in the circuit board outer peripheral part. This position is close to free space and away from an IC such as a CPU that becomes a noise source. Therefore, when this is used so as to function as an antenna, the antenna performance is improved.

  Application Example 2 A first circuit board on which a first terminal unit including a plurality of terminals is installed, a high-frequency circuit installed on the first circuit board and connected to the first terminal unit, and a plurality of terminals A second circuit board on which the second terminal part is included, and a conduction part that connects the first terminal part and the second terminal part, and the first terminal part and the second terminal part A plurality of terminals included in at least one of the terminal portions are connected via a capacitor, and the first terminal portion and the second terminal portion are antennas of the high-frequency circuit. .

  According to this, a plurality of terminals included in at least one of the first terminal portion and the second terminal portion are connected via the capacitor, and the first terminal portion and the second terminal portion are connected to the high-frequency circuit. By functioning as an antenna, an antenna element such as a chip antenna is not required, and an antenna connection means is also unnecessary, so that a wireless communication device using a plurality of antennas can be reduced in size, weight, and cost.

  Moreover, generally the 1st terminal part and the 2nd terminal part are installed in each circuit board outer peripheral part. This position is close to free space and away from an IC such as a CPU that becomes a noise source. Therefore, when this is used so as to function as an antenna, the antenna performance is improved.

  Application Example 3 In the wireless communication apparatus, the antenna includes at least a first antenna and a second antenna, and the first antenna and the second antenna are positioned in directions substantially orthogonal to each other. A wireless communication device.

  According to this, there is little mutual interference between antennas, and efficient wireless communication becomes possible.

  Application Example 4 In the wireless communication apparatus, the first antenna and the second antenna are used for communication with different frequencies.

  According to this, separate communications can be performed at different frequencies.

  Application Example 5 In the wireless communication apparatus, the antenna includes at least a first antenna and a second antenna, the first antenna is used for communication at a first frequency, and the second antenna is The wireless communication apparatus is characterized in that the terminal portion is shorter than the first antenna and is used for communication at a second frequency higher than the first frequency.

  According to this, efficient wireless communication can be realized.

  Application Example 6 In the wireless communication device described above, the terminal unit is arranged separately on both surfaces of the circuit board or on the same surface.

  According to this, by selecting a high-performance antenna configuration, the transmission efficiency and the reception sensitivity of the high-frequency circuit are improved.

  Application Example 7 In the wireless communication device, the antenna is a dipole antenna.

  According to this, since it becomes a high-performance antenna, the transmission efficiency and reception sensitivity of the high-frequency circuit are improved. A monopole antenna requires a large-area GND in order to exhibit its performance, but it is difficult to sufficiently secure it with a small wireless communication device such as a wristwatch type. On the other hand, since a dipole antenna does not require GND in principle, it is suitable for a small wireless communication apparatus such as a wristwatch type.

  Application Example 8 In the wireless communication apparatus, the antenna is a diversity antenna.

  According to this, since the antenna with the better reception state can be selected, it becomes a high-performance antenna and the transmission efficiency and reception sensitivity of the high-frequency circuit are improved.

  Application Example 9 In the above wireless communication device, the first internal circuit installed on the second circuit board and connected to the second terminal unit, the first circuit board, and A second internal circuit connected to the first terminal part and outputting a DC signal or a low-frequency signal, one end connected to the second terminal part and the other end connected to the first internal circuit. It further includes at least one of a first high frequency cutoff element to be connected and a second high frequency cutoff element having one end connected to the first terminal portion and the other end connected to the second internal circuit. Wireless communication device.

  According to this, since the high-frequency circuit and the antenna are connected via the second terminal portion on the surface of the second circuit board connected to the first internal circuit via the first high-frequency cutoff element, the first The DC signal or low frequency signal of the signal input to the internal circuit and the high frequency signal used in the high frequency circuit are separated by frequency. Further, since the high frequency circuit and the antenna are connected via the first terminal portion on the surface of the first circuit board connected to the second internal circuit via the second high frequency cutoff element, the high frequency circuit and the antenna are connected to the second internal circuit. The DC signal or low frequency signal of the input signal and the high frequency signal used in the high frequency circuit are separated by frequency.

  Application Example 10 In the wireless communication device, the first and second high frequency cutoff elements are inductance elements.

  According to this, the inductance element functions as a so-called low-pass filter. That is, since it has a high impedance for the frequency component of the high frequency signal and a low impedance for the frequency component of the DC signal or the low frequency signal, the leakage of the high frequency signal to the first and second internal circuits is prevented. In addition, a DC signal or a low-frequency signal applied to the first and second terminal portions can be passed to the first and second internal circuits.

  Application Example 11 In the wireless communication apparatus, the first and second high frequency cutoff elements are resistance elements.

  According to this, the resistance element has a function of blocking a high-frequency signal (a large amount of current). Further, since the current flowing through the first and second internal circuits is very small, a certain resistance value can be allowed. Therefore, the direct current signal or the low frequency signal applied to the first and second terminal portions can be used as the first and second frequency signals. Can flow to internal circuit.

  Application Example 12 In the wireless communication device, the first internal circuit is a display unit, and the second internal circuit is a digital IC for signal processing.

  According to this, the information in the wireless communication device can be visually confirmed and digital signal processed.

BRIEF DESCRIPTION OF THE DRAWINGS Explanatory drawing which shows the whole structure of the arm mounting | wearing type | mold radio | wireless communication apparatus which concerns on 1st Embodiment. The top view and bottom view which show the circuit assembly mounted in the arm mounting | wearing type | mold radio | wireless communication apparatus which concerns on 1st Embodiment. The top view which shows the arm mounting | wearing type | mold radio | wireless communication apparatus which concerns on 1st Embodiment. The figure which shows the upper surface of the circuit board which concerns on 1st Embodiment. The figure and sectional drawing which show the upper surface of the circuit board which concerns on 2nd Embodiment. The top view which shows the arm mounting | wearing type | mold radio | wireless communication apparatus which concerns on 2nd Embodiment. Sectional drawing which shows the arm mounting | wearing type | mold radio | wireless communication apparatus which concerns on 3rd Embodiment. The figure which shows the upper surface of the display panel board | substrate which concerns on 3rd Embodiment. Sectional drawing which shows the arm mounting | wearing type | mold radio | wireless communication apparatus which concerns on 4th Embodiment. The figure which shows the upper surface of the circuit board which concerns on 5th Embodiment. 1 is a block diagram showing an arm-mounted wireless communication apparatus according to Embodiment 1. FIG. FIG. 3 is a diagram illustrating an upper surface of a circuit board according to the first embodiment. FIG. 3 is a diagram showing an upper surface of a display panel substrate according to the first embodiment. FIG. 10 is a diagram illustrating a configuration of an antenna according to a third embodiment. FIG. 10 is a diagram illustrating a configuration of an antenna according to a fourth embodiment.

  Based on the drawings, an arm-mounted wireless communication device as a wireless communication device according to the present embodiment will be described.

(First embodiment)
FIG. 1 is an explanatory diagram showing the overall configuration of the wrist-worn radio communication apparatus according to the present embodiment. 2A and 2B are a plan view and a bottom view showing the circuit assembly mounted on the arm-mounted radio communication device according to the present embodiment.

  The arm-mounted wireless communication device 2 according to the present embodiment includes a device main body 12 in which a side on which a liquid crystal display panel (display unit) (first internal circuit) 10 is disposed is a surface side, a pair of arm bands 14R, 14L. Each arm band 14R, 14L has a band base end attached to both ends of the apparatus body 12, and these bands can be connected to each other by a buckle 16 at each end.

  The apparatus main body 12 includes a casing 18 on the front surface side, and a back cover 20 fixed to the back side of the casing 18 on the back side of the apparatus main body 12. A circuit assembly 22 is built in the apparatus main body 12 constituted by the casing 18 and the back cover 20. The circuit assembly 22 has a structure in which main components are stacked in the thickness direction inside the apparatus main body 12. That is, in the circuit assembly 22, as shown in FIG. 2, the liquid crystal display panel 10, the circuit board (first circuit board) 24, and the circuit driving battery 26 are arranged in the thickness direction.

  FIG. 3 is a top view showing the arm-mounted radio communication device 2 according to the present embodiment. The wrist-worn radio communication device 2 includes a circuit board 24 and a display panel board (second circuit board) 32. On the circuit board 24, various integrated circuits (ICs) to be described later and circuit board side terminals are arranged. A multilayer substrate is used for the circuit board 24, and a surface layer pattern (wiring pattern) is formed on a substrate made of a glass-epoxy substrate, a phenol resin substrate, or a ceramic substrate.

  On the display panel substrate 32, the liquid crystal display panel 10 and display panel side terminals described later are arranged.

  Generally, the circuit board side terminal on the circuit board 24 and the display panel side terminal on the display panel board 32 are “stacked alternately in a zebra shape with conductive silicone rubber using metal particles as a conductor and electrically insulating silicone rubber. Are connected by “a rubber connector” (commonly referred to as a zebra, hereinafter referred to as a zebra connector (conductive portion)). Here, since the signal supplied to the liquid crystal display panel 10 is a DC signal or a low frequency (1 MHz or less) signal, it is separated from a high frequency signal having a frequency of 2.4 GHz or 1.575 GHz, which is currently used for normal wireless communication. Can be made.

  FIG. 4 is a view showing the upper surface of the circuit board 24 according to the present embodiment. 4 shows a state in which the display panel substrate 32 (see FIG. 3) is removed from the circuit board 24. The circuit board 24 includes a high frequency analog IC (high frequency circuit) 36 having transmission and reception functions, a plurality of circuit board side terminals 28 constituting the first terminal portion, a high frequency analog IC 36 and the circuit board side terminals 28. A wiring 52 to be connected is arranged. The high frequency analog IC 36 transmits and receives a high frequency signal (RF signal) such as 2.4 GHz or 1.575 GHz.

  In addition to functioning as a connection terminal between the circuit board 24 and the display panel substrate 32, the circuit board-side terminal 28 functions as an antenna of the high-frequency analog IC 36 of the arm-mounted wireless communication device 2. The plurality of circuit board side terminals 28 are naturally separated in order to transmit different signals. Therefore, it does not function as an antenna as it is. Therefore, a small-capacitance coupling capacitor 68 is connected to the plurality of circuit board side terminals 28. That is, the connection is made at a high frequency. On the other hand, since the signal applied to the circuit board side terminal 28 is a direct current signal or a low frequency signal, there is no possibility of causing a functional problem even if it is coupled by a small capacity coupling capacitor 68. Further, the antenna length, that is, the frequency can be adjusted by the number of coupling capacitors 68 connected to the plurality of circuit board side terminals 28.

  In general, the circuit board-side terminal 28 is installed on the outer periphery of the circuit board 24. This position is close to free space and is away from an IC such as a CPU that becomes a noise source. Therefore, when this is used as an antenna, antenna performance is improved.

  Here, the impedance between the circuit board side terminals 28 connected by the coupling capacitor 68 will be described. When the capacitance C of the coupling capacitor 68 is 20 pF, the impedance Z when the frequency of the high frequency signal is 2.4 GHz is Z = 1 / jωC, and the impedance Z is about 3 ohms. Here, ω is an angular frequency. The impedance Z with a frequency of 1.575 GHz is about 5 ohms. With this value, high-frequency signals can be connected with sufficiently low impedance.

  On the other hand, since the signal applied to the circuit board side terminal 28 is a DC signal or a low frequency signal, there is no possibility that a problem will occur even if the signals are coupled with such a capacity. For example, when the frequency is 1 MHz, the impedance Z is about 8 Mohm, and it can be regarded as substantially open at this frequency.

  Further, the antenna length, that is, the frequency can be adjusted by the number of coupling capacitors 68 connected to the plurality of circuit board side terminals 28. For example, the wavelength λ in a vacuum of 2.4 GHz is 12.5 cm. Since the required length of the monopole antenna is λ / 4, it is 3.125 cm. Here, for example, when a glass epoxy substrate is used, the relative dielectric constant εr is 4.7, and the required length of the antenna is 3.125 ÷ 4.7 ^ (1/2), which is 1.44 cm. Further, for example, when a high dielectric constant ceramic substrate is used, the relative dielectric constant εr is 30 and the required length of the antenna is 3.125 ÷ 30 ^ (1/2), which is 0.57 cm.

  For example, the wavelength λ in a vacuum of 1.575 GHz is 19 cm. Since the required length of the monopole antenna is λ / 4, it is 4.75 cm. Here, for example, when a glass epoxy substrate is used, the relative dielectric constant εr is 4.7, and the required length of the antenna is 2.75 ÷ 4.7 ^ (1/2), which is 2.19 cm. For example, when a high dielectric constant ceramic substrate is used, the relative dielectric constant εr is 30 and the required length of the antenna is 4.75 ÷ 30 ^ (1/2), which is 0.87 cm. The above antenna length values are all feasible values.

  According to the present embodiment, the arm-mounted radio communication device 2 uses at least one continuous terminal among the plurality of circuit board side terminals 28 as an antenna, so that an antenna element such as a chip antenna becomes unnecessary. Since the antenna connecting means is not required, the device can be reduced in size, weight and cost.

(Second Embodiment)
FIG. 5 shows a top view and a cross-sectional view of the circuit board according to the present embodiment. 5A is a top view, FIG. 5B is a cross-sectional view, and FIG. 5C is a diagram showing capacitive coupling. 5 shows a state in which the display panel substrate 32 (see FIG. 3) is removed from the circuit board 24. In the description of the present embodiment, the same components as those of the above-described embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  As shown in FIG. 5A, the arm-mounted radio communication device 4 according to the present embodiment is replaced with a circuit board side terminal instead of the coupling capacitor 68 (see FIG. 4) of the arm-mounted radio communication device 2 described above. A pattern (conductor) 64 is provided on the outer layer (or the inner layer) of the circuit board 24 at the opposing portion of 28. As a result, as shown in FIG. 5C, the circuit board side terminals 28 function as an antenna by capacitively coupling the circuit board side terminals 28.

Here, the coupling capacitance between the circuit board side terminals 28 will be described. The capacity of the plate capacitor is C = ε × ε ₀ × S / d. Here, ε is a relative dielectric constant, ε ₀ is a dielectric constant in vacuum, S is an area of the circuit board side terminal 28, and d is a distance between the circuit board side terminal 28 and the pattern (conductor) 64. When a high dielectric constant substrate is used for the circuit board 24, ε is 30, S is 0.4 mm ² (length 2 mm, width 0.2 mm), and d is 0.01 mm, the coupling capacitance is about 10.6 pF. Become. In this case, the impedance Z when the frequency of the high frequency signal is 2.4 GHz is about 6 ohms from Z = 1 / jωC. Here, ω is an angular frequency. Since each capacitor is about 6 ohms, the circuit board side terminals 28 are about 12 ohms and can be connected with a sufficiently low impedance. A plurality of circuit board side terminals 28 can be connected at a high frequency by this capacity. Further, the impedance Z having a frequency of 1.575 GHz is about 18 ohms and can be connected with a sufficiently low impedance.

  On the other hand, since the signal applied to the circuit board side terminal 28 is a DC signal or a low frequency signal, there is no possibility that a problem will occur even if the signals are coupled with such a capacity. For example, if the frequency is 1 MHz, the impedance per piece is about 15 M ohms, and the distance between the circuit board side terminals 28 is about 30 M ohms.

  Further, the antenna length, that is, the frequency can be adjusted by the length of the pattern (conductor) 64 as described in the first embodiment.

  FIG. 6 is a view showing the upper surface of the circuit board 24 according to the present embodiment. FIG. 6 shows a state in which the display panel substrate 32 (see FIG. 3) is removed from the circuit board 24. A signal processing digital IC (second internal circuit) 38 is disposed on the circuit board 24. The signal processing digital IC 38 incorporates a digital circuit for sampling a received signal before analog / digital conversion, a phase lock loop circuit, and the like.

  In order to surely prevent leakage of the high frequency signal to the signal processing digital IC 38, when the impedance of the signal processing digital IC 38 on the circuit board 24 is low or the line is long as viewed from the high frequency analog IC 36, the signal processing is performed. An inductance element 46 or a resistance element 48 as a second high frequency cutoff element may be inserted between the digital IC 38 for use and the circuit board side terminal 28. The signal supplied to the signal processing digital IC 38 is a DC signal or a low-frequency signal, and since the current is very small, even if the inductance element 46 or the resistance element 48 is inserted, there is almost no possibility of causing a problem.

  Further, in the present embodiment, since there is a possibility that a high frequency signal leaks to the display panel substrate 32 through the zebra connector, it is desirable that the zebra connector has a high resistance or has an inductance characteristic. Also in this case, the signal supplied to the liquid crystal display panel 10 is a DC signal or a low-frequency signal, and since the current is very small, there is almost no problem.

  According to this embodiment, since it is not necessary to mount a capacitor, the apparatus can be further reduced in size, weight, and cost.

(Third embodiment)
FIG. 7 is a cross-sectional view showing the arm-mounted wireless communication apparatus according to the present embodiment. In the description of this embodiment, the same components as those of the above-described embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  The arm-mounted wireless communication device 6 according to the present embodiment is a zebra that connects the circuit board side terminal 28 on the circuit board 24 and the plurality of display panel side terminals 40 constituting the second terminal portion on the display panel board 32. A connector 42 is disposed. The arm-mounted wireless communication device 6 is used so that the zebra connector 42 itself functions as an antenna in addition to the second embodiment. In general, the zebra connector 42 is installed on the outer periphery of the circuit board 24. This position is close to free space and is away from an IC such as a CPU that becomes a noise source. Therefore, when the zebra connector 42 is used so as to function as an antenna, the antenna performance is further improved. Moreover, since the volume of the conductor used by functioning as an antenna is increased by the zebra connector 42, the antenna performance is improved. In this case, it is desirable that the resistance of the zebra connector 42 is low.

  FIG. 8 is a view showing the upper surface of the display panel substrate 32 according to the present embodiment. In order to surely prevent leakage of the high frequency signal to the liquid crystal display panel 10, when the impedance of the liquid crystal display panel 10 on the display panel substrate 32 is low or the line is long as viewed from the high frequency analog IC 36 (see FIG. 6). May include an inductance element 46 or a resistance element 48 as a first high-frequency cutoff element between the liquid crystal display panel 10 and the display panel side terminal 40. The signal supplied to the liquid crystal display panel 10 is a DC signal or a low-frequency signal, and the current is very small. Therefore, even if the inductance element 46 and the resistance element 48 are inserted, there is almost no problem.

(Fourth embodiment)
FIG. 9 is a cross-sectional view showing the arm-mounted wireless communication apparatus according to the present embodiment. In the description of the present embodiment, the same components as those of the above-described embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  The arm-mounted wireless communication device 8 according to the present embodiment has a pattern (or an inner layer) on the outer layer (or inner layer) of the display panel substrate 32 that is opposite to the display panel-side terminal 40 in addition to the arm-mounted wireless communication device 6 described above. Conductor) 66 is provided. As a result, as shown in FIG. 9, the display panel side terminals 40 function as an antenna by capacitively coupling the display panel side terminals 40 to each other.

  According to this embodiment, since it is not necessary to mount a capacitor, the apparatus can be further reduced in size, weight, and cost.

(Fifth embodiment)
FIG. 10 is a view showing the upper surface of the circuit board 24 according to the present embodiment. In the description of the present embodiment, the same components as those of the above-described embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  In general, the circuit board 24 and the display panel board 32 (see FIG. 9) are connected vertically or in pairs. Therefore, the arm-mounted radio communication apparatus 100 according to the present embodiment is used so that the upper and lower circuit board side terminals 28 are capacitively coupled by the pattern (conductor) 64 and function as an antenna. In addition, the terminal portions that connect the circuit board 24 and the display panel substrate 32 may be arranged separately on both surfaces of the circuit board 24 or may be arranged on the same surface.

Next, an arm-mounted wireless communication apparatus using a plurality of frequencies according to the above embodiment will be described using examples.
Example 1
FIG. 11 is a block diagram illustrating the arm-mounted wireless communication apparatus according to the present embodiment. The arm-mounted radio communication apparatus 100 according to the present embodiment includes a high frequency analog IC (high frequency circuit) 36a, a first antenna 70a, a high frequency analog IC (high frequency circuit) 36b, a second antenna 70b, and a display unit 50. The control part 51 is provided. The high frequency analog IC 36a is in charge of the 2.4G communication function, and the antenna function is in charge of the first antenna 70a. The high-frequency analog IC 36b is in charge of the 1.575 GGPS reception function, and the antenna function is in charge of the second antenna 70b. The display unit 50 displays communication content, map information, and time information. The control unit 51 controls the system.

  The right zebra connector 42, the circuit board side terminal 28, and the display panel side terminal 40 shown in FIG. 12 are used as the first antenna 70a, and the upper zebra connector 42, the circuit board side terminal 28, and the display panel are used as the second antenna 70b. The side terminal 40 is used.

  This eliminates the need for an antenna element such as a chip antenna, and also eliminates the need for an antenna connection means, thereby making it possible to reduce the size, weight, and cost of the device. Further, the terminal portions of the two zebra connectors 42 used as the first and second antennas 70a and 70b having different frequencies and the zebra connectors 42 are arranged vertically. In other words, since the first antenna 70a and the second antenna 70b are located in directions substantially orthogonal to each other, mutual interference is reduced. Further, when the lengths of the terminal portions of the two zebra connectors 42 used as the first and second antennas 70a and 70b having different frequencies and the lengths of the zebra connectors 42 are different, the longer one of the lengths of the zebra connectors 42 is changed. The lower one (long wavelength) is used for communication, and the shorter one is used for communication having a higher frequency (short wavelength). Thereby, efficient wireless communication can be realized.

  When the impedance of the liquid crystal display panel 10 on the display panel substrate 32 is low or the line is long as viewed from the high frequency analog IC 36, an inductance element is used to reliably prevent leakage of the high frequency signal to the liquid crystal display panel 10. 46 or a resistance element 48 may be inserted. The signal supplied to the liquid crystal display panel 10 is a direct current signal or a signal with an extremely low frequency, and the current is very small. Therefore, even if the inductance element 46 or the resistance element 48 is inserted, there is almost no problem.

  FIG. 12 is a diagram illustrating an upper surface of the circuit board 24 according to the present embodiment. The wrist-worn radio communication apparatus 100 according to the present example can insert an inductance element 46 or a resistance element 48 between the signal processing digital IC 38 and the circuit board side terminal 28 as in the second embodiment. Good.

  FIG. 13 is a diagram showing an upper surface of the display panel substrate 32 according to the present embodiment. In the arm-mounted wireless communication device 100 according to the present embodiment, an inductance element 46 and a resistance element 48 may be inserted between the liquid crystal display panel 10 and the display panel side terminal 40 as in the third embodiment. .

  Note that the first and second embodiments may be applicable to the arm-mounted wireless communication apparatus 100 according to the present embodiment.

(Example 2)
In the arm-mounted radio communication apparatus 100 according to the present embodiment, the circuit board 24 and the display panel board 32 (see FIG. 9) may be connected vertically or horizontally as a pair as in the fifth embodiment. .

(Example 3)
FIG. 14 is a diagram illustrating a configuration of the antenna according to the present embodiment. As shown in FIG. 14, the wrist-worn radio communication apparatus 100 according to the present embodiment is configured such that two circuit board side terminals 28 function as dipole antennas 54. Thereby, since it becomes a high-performance antenna, transmission efficiency and reception sensitivity are improved. A monopole antenna requires a large-area GND in order to exhibit its performance, but it is difficult to sufficiently secure it with a small device such as an arm-mounted radio communication device. On the other hand, since a dipole antenna does not require GND in principle, it is suitable for a small wireless device such as an arm-mounted wireless communication device. You may apply to a left-right pair. Of course, it may be applied to only one pair or to both pairs.

Example 4
FIG. 15 is a diagram illustrating the configuration of the antenna according to the present embodiment. In the description of this example, the same reference numerals are given to the same components as those of the above-described embodiment and examples, and the description thereof is omitted.

  As shown in FIG. 15, the wrist-worn radio communication device 100 according to the present embodiment is configured such that the two circuit board side terminals 28 function as the diversity antenna 56. As a result, since the signal is input through the two radio wave reception routes, the function of the antenna having the better reception state can be selected, so that the antenna becomes a high-performance antenna and the transmission efficiency and the reception sensitivity are improved. You may apply to a left-right pair. Of course, it may be applied to only one pair or to both pairs.

  As a wireless communication device that can use this embodiment, in addition to the arm-mounted wireless communication device described above, a pager (portable small wireless device caller) that uses a high-frequency circuit and an antenna element in a space-saving manner, There are telephone sets, television sets, satellite receivers such as GPS (Global Positioning System), and wireless LAN (Local Area Network).

  2, 4, 6, 8, 100 ... Arm-mounted wireless communication device (wireless communication device) 10 ... Liquid crystal display panel (display unit) (first internal circuit) 12 ... Device body 14R, 14L ... Arm band 16 ... Buckle 18 ... Casing 20 ... Back cover 22 ... Circuit assembly 24 ... Circuit board (first circuit board) 26 ... Circuit drive battery 28 ... Circuit board side terminal 32 ... Display panel board (second circuit board) 36, 36a, 36b ... High-frequency analog IC (high-frequency circuit) 38 ... Digital IC for signal processing (second internal circuit) 40 ... Display panel side terminal 42 ... Zebra connector (conduction part) 46 ... Inductance element (first and second high-frequency cutoff elements) 48 ... Resistance element (first and second high-frequency cutoff elements) 50... Display unit 51... Control unit 52 .. wiring 54 .. dipole antenna 56. Antenna 64, 66 ... pattern (conductor) 68 ... coupling capacitor (condenser) 70a ... first antenna 70b ... second antenna.

Claims (12)

A circuit board on which a terminal portion including a plurality of terminals is installed;
A high frequency circuit installed on the circuit board and connected to the terminal portion;
A capacitor for connecting the terminals of the terminal portion;
Including
The wireless communication device, wherein the terminal portion connected by the capacitor is an antenna of the high-frequency circuit. A first circuit board on which a first terminal portion including a plurality of terminals is installed;
A high-frequency circuit installed on the first circuit board and connected to the first terminal portion;
A second circuit board on which a second terminal portion including a plurality of terminals is installed;
A conduction portion connecting the first terminal portion and the second terminal portion;
Including
A plurality of terminals included in at least one of the first terminal portion and the second terminal portion are connected via a capacitor,
The wireless communication device, wherein the first terminal portion and the second terminal portion are antennas of the high-frequency circuit. The wireless communication apparatus according to claim 1 or 2,
The antenna includes at least a first antenna and a second antenna,
The wireless communication apparatus, wherein the first antenna and the second antenna are located in directions substantially orthogonal to each other. The wireless communication device according to claim 3.
The wireless communication apparatus, wherein the first antenna and the second antenna are used for communication at different frequencies. The wireless communication apparatus according to claim 1 or 2,
The antenna includes at least a first antenna and a second antenna,
The first antenna is used for communication at a first frequency,
The wireless communication apparatus, wherein the second antenna has a terminal portion shorter than the first antenna and is used for communication at a second frequency higher than the first frequency. In the radio | wireless communication apparatus as described in any one of Claims 1-5,
The wireless communication apparatus, wherein the terminal portion is arranged separately on both surfaces of the circuit board or on the same surface. The wireless communication apparatus according to claim 6, wherein
The wireless communication apparatus, wherein the antenna is a dipole antenna. The wireless communication apparatus according to claim 6, wherein
The radio communication apparatus according to claim 1, wherein the antenna is a diversity antenna. In the wireless communication apparatus according to any one of claims 1 to 8,
A first internal circuit installed on the second circuit board and connected to the second terminal portion;
A second internal circuit that is installed on the first circuit board and connected to the first terminal unit and from which a DC signal or a low-frequency signal is output,
A first high-frequency cutoff element having one end connected to the second terminal portion and the other end connected to the first internal circuit;
A second high-frequency cutoff element having one end connected to the first terminal portion and the other end connected to the second internal circuit;
A wireless communication apparatus further comprising at least one. The wireless communication device according to claim 9, wherein
The wireless communication apparatus, wherein the first and second high-frequency cutoff elements are inductance elements. The wireless communication device according to claim 9, wherein
The wireless communication apparatus, wherein the first and second high-frequency cutoff elements are resistance elements. The wireless communication apparatus according to any one of claims 9 to 11,
The first internal circuit is a display unit,
The wireless communication device, wherein the second internal circuit is a digital IC for signal processing.

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