JP2011188398A - Radio communication apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a radio communication apparatus that is improved in antenna characteristics. <P>SOLUTION: A radio communication apparatus includes a first casings including a substrate on which an antenna is mounted, a second casing, and a slide module for sliding the second casing with respect to the first casing. Furthermore, at least two contacts are provided between a ground of the substrate and the slide module and capacitance is loaded on one contact. The contacts are provided at positions, which are separated from the antenna, inside an area where the substrate and the slide module are overlapped during a slide open state. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a wireless communication apparatus that performs wireless communication.

  2. Description of the Related Art A cellular phone is known as a two-case type in which a main body side housing including a main body side substrate on which an operation unit is mounted and a display side housing including a display side substrate on which a liquid crystal display unit is mounted are separately provided. .

  The two-case type includes a folding type and a slide type. In recent years, a slide-type mobile phone has been attracting attention from the viewpoint of being able to enlarge the liquid crystal display unit and convenience in using a mounted camera.

FIG. 33 is a diagram showing an example of the appearance of a slide type mobile phone. (A) shows a slide closed state, and (B) shows a slide open state.
The slide type mobile phone 100 includes a lower body side casing 110 and an upper display side casing 120. A keyboard 111 such as a character / number input key, a microphone 112, and the like are mounted on the main body side housing 110, and electronic components such as a battery and an antenna are mounted on the main body side substrate inside the main body side housing 110. The display-side casing 120 is equipped with an LCD (Liquid Crystal Display) 121, a receiver (earpiece) 122, a multifunction key 123, and the like.

  Furthermore, the slide-type mobile phone 100 has a slide module (not shown) that is a module for sliding the display-side housing 120 with respect to the main body-side housing 110.

  With the slide opening / closing mechanism by the slide module, in the slide closed state shown in FIG. Further, in the slide open state shown in (B), the display side housing 120 is linearly slid and opened with respect to the main body side housing 110 to expose the operation unit such as the keyboard 111.

  On the other hand, mobile phones are required to be small, thin, and light, and accordingly, the area given to mobile phone antennas is shrinking, and it is difficult to maintain good antenna characteristics. Yes. For this reason, development of a mobile phone having a structure that satisfies a desired shape design and suppresses deterioration of antenna characteristics is demanded.

  As a conventional technology of a slide-type mobile phone, a technology has been proposed in which a load is provided on a slide rail in order to improve antenna characteristics (Patent Document 1). Moreover, the technique which inserted the resonance circuit between the slide rail and the ground conductor is proposed (patent document 2).

JP 2006-203806 A JP 2009-44326 A

  However, the slide type mobile phone as described above has a problem that the antenna characteristics deteriorate when the slide is open. This is because, in the slide open state, the metal part of the slide module comes near the antenna installed on the main body side substrate, and the antenna current is canceled by this metal part. When such a phenomenon occurs, radio wave radiation at the antenna is hindered.

  The present invention has been made in view of these points, and an object of the present invention is to provide a wireless communication apparatus with improved antenna characteristics.

  In order to solve the above problems, a wireless communication device is provided. The wireless communication apparatus includes a first housing including a substrate on which an antenna is mounted, a second housing, and a slide module that slides the second housing with respect to the first housing. And at least two contacts are provided between the ground of the substrate and the slide module, and a capacity is loaded on one of the contacts.

  Antenna characteristics can be improved.

It is a figure which shows the structural example of a radio | wireless communication apparatus. It is a figure which shows a main body side board | substrate. It is the figure which looked at FIG. 2 from the A direction. It is a figure which shows the connection part of an antenna. It is a figure which shows a slide module. It is the figure which looked at FIG. 5 from the B direction. It is the figure which looked at FIG. 5 from the C direction. It is a figure which shows a rail part. It is the figure which looked at FIG. 8 from the D direction. It is the figure which looked at FIG. 8 from E direction. It is a figure which shows a base part. It is the figure which looked at FIG. 11 from the F direction. It is the figure which looked at FIG. 11 from the G direction. It is a figure which shows a slide open state. It is the figure which looked at FIG. 14 from the H direction. It is a figure which shows the electric current distribution of a slide open state. It is a figure which shows an antenna characteristic. It is a figure which shows the position of the contact seen from the main body side board | substrate. It is a figure which shows the position of the contact seen from the slide module. It is the figure which looked at FIG. 18 from I direction. It is the figure which looked at FIG. 18 from the J direction. It is a figure which shows generation | occurrence | production of a current loop. It is a figure which shows the electric current distribution of a slide open state. It is a figure which shows a VSWR characteristic. It is a figure which shows the state by which the resonance circuit is inserted. It is a figure which shows a VSWR characteristic. It is a figure which shows the electric current which flows through a resonance circuit. It is a figure which shows the position of the contact and coupling conductor installation location seen from the main body side board | substrate. It is a figure which shows the position of the contact and coupling conductor installation location seen from the slide module. It is a figure which shows an example of the conductor for coupling | bonding. It is a figure which shows the structure by which the coupling conductor is installed. It is a figure which shows a VSWR characteristic. It is a figure which shows an example of the external appearance of a slide type mobile telephone. (A) shows a slide closed state, and (B) shows a slide open state.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a diagram illustrating a configuration example of a wireless communication apparatus. The wireless communication device 1 includes a first housing 10, a second housing 20, and a slide module 30. The wireless communication device 1 can be applied to, for example, a portable wireless device, and can be applied to a slide-type mobile phone.

  The first housing 10 includes a substrate 12 on which an antenna 11 is mounted. The second housing 20 is mounted on the slide module 30, and the slide module 30 slides the second housing 20 with respect to the first housing 10.

  In addition, at least two contact points connected by a conductor are provided between a substrate ground (hereinafter referred to as GND) 12a which is a ground of the substrate 12 which is a part of the antenna 11 and the slide module 30. Load capacity (C) at the contact. In the case of the figure, two contacts 41 and 42 are provided, and a capacity is loaded on the contacts 42.

  A detailed configuration and operation will be described later. Further, hereinafter, the first casing 10 is referred to as a main body side casing 10, the substrate 12 is referred to as a main body side substrate 12, and the second casing 20 is referred to as a display side casing 20.

Next, as an application example of the wireless communication apparatus 1, a case where it is applied to a slide type mobile phone will be described in detail. First, the structure of the slide type mobile phone will be described.
FIG. 2 is a view showing the main body side substrate 12. 3 is a view of FIG. 2 as viewed from the direction A, and FIG. 4 is a view showing a connection portion of the antenna 11.

  The main body side board 12 includes a main body side main board 12-1 and a main body side sub board 12-2. The main body side main board 12-1 and the main body side sub board 12-2 are connected to each other via the connector 2 for connection. Connect. Components such as a keyboard, a battery, and a microphone are mainly mounted on the main body side sub-board 12-2. The antenna 11 is connected to the antenna feeding point 11a on the main body side main board 12-1, and is mounted on the upper end portion of the main body side main board 12-1.

  In addition, the main body side main board 12-1 includes a part of a control circuit for controlling user interface components mounted on the main body side sub board 12-2 and communication for performing wireless communication through the antenna 11. A control circuit and the like are mounted.

  Here, when considering the installation position of the antenna 11 of the slide type mobile phone, the installation position includes the upper end portion of the display side substrate, the upper end portion of the main body side main substrate 12-1, and the main body side. Any of the three lower end portions of the main board 12-1 can be considered.

  However, if the antenna 11 is installed at the lower end portion of the main body side main board 12-1, the user's hand / finger is easily applied to the antenna, and therefore the lower end portion of the main body side main board 12-1 can be avoided. Further, if the upper end portion of the display side substrate is used, the local average SAR (Specific Absorption Rate: power value per unit time / unit mass absorbed by a specific part of the human body) becomes high, so the upper end portion of the display side substrate. Can also be avoided. Therefore, the upper end portion of the main body side main board 12-1 as shown in FIGS. 2 to 4 is generally selected as the optimum antenna installation location.

  On the other hand, monopole antennas are often used as antennas for mobile phones. In the monopole antenna, the substrate GND on which the monopole antenna is installed also becomes an antenna and becomes a part of the antenna. That is, a current that contributes to radio wave radiation flows not only to the antenna but also to the GND of the circuit board to which the antenna is connected, and the antenna characteristics change depending on the current distribution on the GND of the circuit board.

  For this reason, even if the antenna is small, there is an advantage that a gain can be obtained by the size of the GND of the substrate, and the monopole antenna is widely used in small portable wireless devices such as mobile phones. A monopole antenna is also used for the antenna 11 of the slide-type mobile phone, and the GND (substrate GND 12a) of the main board 12-1 on the main body is a part of the antenna 11. Note that the change in antenna characteristics due to the current distribution on GND appears more prominently at lower frequencies.

  Next, the slide module 30 will be described. FIG. 5 is a view showing the slide module 30. 6 is a view of FIG. 5 viewed from the B direction, and FIG. 7 is a view of FIG. 5 viewed from the C direction. The slide module 30 includes a metal rail portion 31 and a base portion 32. The rail portion 31 is fixed to a resin case (not shown) of the display side housing 20 with screws. The base portion 32 is fixed to a resin case (not shown) of the main body side housing 10 with screws.

  FIG. 8 is a view showing the rail portion 31. 9 is a view of FIG. 8 viewed from the D direction, and FIG. 10 is a view of FIG. 8 viewed from the E direction. Concave portions 31a and 31b for sliding operation are provided at both ends of the rail portion 31, and a concave low friction resin (not shown) is embedded in the concave portions 31a and 31b. It is.

  FIG. 11 is a diagram showing the base portion 32. 12 is a view of FIG. 11 viewed from the F direction, and FIG. 13 is a view of FIG. 11 viewed from the G direction. At both ends of the base portion 32, convex-shaped portions 32a and 32b are provided for engaging with the concave-shaped portions 31a and 31b of the rail portion 31 to perform a sliding operation. The convex portions 32a and 32b are processed into a convex shape that meshes with the above-mentioned low friction resin, and the sliding operation is realized by contacting the low friction resin with a low frictional force so that the rail portion 31 can slide. To do.

  Next, the slide open state will be described. FIG. 14 is a diagram showing a slide open state, and FIG. 15 is a diagram of FIG. 14 viewed from the H direction. 14 and 15 show a slide open state when the rail portion 31 on which the display side housing 20 is mounted is slid to expose the operation portion of the main body side housing 10.

  A display-side substrate (not shown) is attached to the rail portion 31 of the slide module 30. The main body side main substrate 12-1 is attached to the base portion 32 of the slide module 30.

  With the configuration of the slide module 30 as described above, when the rail portion 31 is slid starting from the base portion 32, the display-side housing 20 and the rail portion 31 screwed to the rail portion 31 are integrated. In order to slide, the whole display side housing | casing 20 slides with respect to the main body side housing | casing 10. FIG. 14 and 15, when the rail portion 31 is slid in the right direction, the display side housing 20 is overlapped with the main body side housing 10 to be in a slide closed state.

  Next, the cause of the deterioration of the antenna characteristics in the conventional slide type mobile phone will be described. FIG. 16 is a diagram showing a current distribution in the slide open state. The current distribution when the space | interval of the main body side main board | substrate 12-1 (board | substrate GND12a) and the slide module 30 is a slide open state whose 3 mm is shown is shown.

  The antenna current flowing through the antenna 11 and the board GND 12a of the main body side main board 12-1 has a current distribution that gathers at the antenna 11 and the antenna feeding point 11a, and the current is maximized at the periphery of the antenna 11 and the antenna feeding point 11a. .

  On the other hand, in the slide open state, an overlapping portion is generated between the main board 12-1 on which the antenna 11 is installed and the slide module 30. In this overlapping portion, the substrate GND 12a and the metal of the slide module 30 are formed. The face faces closely. Then, a reverse phase current that tries to cancel (cancel) the antenna current flowing through the antenna 11 and the substrate GND 12 a flows on the slide module 30.

  As shown in FIG. 16, the antenna current flowing through the substrate GND 12a flows to the left because it goes to the antenna 11 and the antenna feeding point 11a, and the current (reverse phase current) flowing through the slide module 30 faces right to try to cancel the antenna current. Flowing into.

  When such a phenomenon occurs, the antenna current is canceled by the reverse-phase current around the slide module 30 at a position below the antenna 11 and the antenna feeding point 11a.

  In this case, in particular, a very strong negative phase current immediately below the antenna 11 and immediately below the antenna feeding point 11a. Further, it varies depending on the distance between the substrate GND 12a and the slide module 30, and the larger the distance, the weaker the reverse phase current, and the smaller the distance, the stronger the reverse phase current.

FIG. 17 is a diagram illustrating antenna characteristics. As antenna characteristics, VSWR (Voltage Standing Wave Ratio) is shown. The vertical axis represents VSWR and the horizontal axis represents frequency.
VSWR is an index of high frequency characteristics that represents the degree to which a part of the signal is reflected on the circuit when the high frequency signal passes through the device. When the value of VSWR is 1, it is an ideal state where there is no reflection at all, and the larger the reflection, the larger the numerical value and the larger the signal loss and the like.

  FIG. 17 shows the VSWR at around 800 MHz and the VSWR at around 2 GHz when the distance between the main body side main board 12-1 and the slide module 30 is 3 mm and 7 mm.

  With VSWR at around 2 GHz, there is no significant difference in the amount of deterioration between the main body side main board 12-1 and the slide module 30 when the distance between them is 3 mm and 7 mm. However, in the VSWR at around 800 MHz, it can be seen that the amount of deterioration increases as the distance between the main body side main board 12-1 and the slide module 30 decreases from 7 mm to 3 mm.

Here, the reason why the band around 800 MHz is more greatly deteriorated when the distance between the main body side main board 12-1 and the slide module 30 is reduced to 3 mm will be described.
In the band around 800 MHz, the lengths of the main body side main board 12-1 and the slide module 30 are about 1/4 with respect to the wavelength λ. And the length of both are approximately λ / 2, so that the entire housing becomes a dipole antenna.

  Therefore, when the current flowing through the substrate GND 12a of the main board 12-1 and the current flowing through the slide module 30 are in phase, the dipole mode is added to the monopole mode (original operation mode), and a large amount of antenna current flows. Good antenna characteristics can be obtained.

  However, when an out-of-phase condition occurs, a large amount of out-of-phase current flows in an attempt to cancel the antenna current, and the out-of-phase current cancels the antenna current, reducing the original function as a monopole antenna. .

  Since a larger amount of antenna current flows in the 800 MHz band than in the 2 GHz band, when a reverse-phase relationship occurs, a larger amount of reverse-phase current flows in the 800 MHz band than in the 2 GHz band. For this reason, in the 800 MHz band, it is more susceptible to the negative phase current flowing through the slide module 30 than in the 2 GHz band. For this reason, when the interval between the main body side main board 12-1 and the slide module 30 is narrowed, the band around 800 MHz is more greatly deteriorated.

  Next, a configuration around the contact of the slide type mobile phone to which the wireless communication device 1 is applied will be described. FIG. 18 is a diagram showing the positions of the contacts 41 and 42 as viewed from the main body side substrate 12, and FIG. 19 is a diagram showing the positions of the contacts 41 and 42 as viewed from the slide module 30. FIG. 20 shows a view of FIG. 18 viewed from the I direction, and FIG. 21 shows a view of FIG. 18 viewed from the J direction.

  Two contacts 41 and 42 are provided between the substrate GND 12a and the slide module 30 (the basic substrate configuration and the slide opening / closing mechanism are the same as those described above). The contacts 41 and 42 are located in a region where the main body side main board 12-1 and the slide module 30 overlap when the display side case 20 is slid to expose the operation surface of the main body side case 10. Therefore, it is provided at a location away from the antenna 11 and the antenna feeding point 11a. This is because the peak of the reverse phase current is separated as much as possible from the antenna 11 and the antenna feeding point 11a. One contact 42 is loaded with a capacity.

  FIG. 22 is a diagram showing the occurrence of a current loop. Two contact points 41 and 42 for connecting the substrate GND 12a and the slide module 30 are provided as far as possible from the antenna 11 and the antenna feeding point 11a, and a capacity is loaded on one of the contact points 42.

  The loading of the capacity can be easily realized by mounting a capacitor on the main body side main board 12-1. With this configuration, a current loop is generated between the substrate GND 12a and the slide module 30.

  FIG. 23 is a diagram showing a current distribution in the slide open state. The simulation result of the current distribution when the space | interval of the main body side main board | substrate 12-1 and the slide module 30 is a slide open state whose 3 mm is 860 MHz is shown.

  Two contacts 41 and 42 for connecting the substrate GND 12a and the slide module 30 are provided, and a capacity is loaded on one of the contacts. Then, a current loop is formed between the substrate GND 12a and the slide module 30, and resonance occurs due to an inductance component (L component) due to the current loop and a capacitance component (C component) of the contact 42.

  Accordingly, as shown in FIG. 23, the peak position of the current of the slide module 30 can be moved from the antenna 11 and the antenna feeding point 11a toward the contacts 41 and 42.

  By moving the peak position of the current, the negative phase current flowing through the slide module 30 in the vicinity of the antenna 11 and the antenna feeding point 11a is reduced, and the canceled antenna current can be reduced, thereby improving the antenna characteristics. Is possible.

Here, the resonance frequency f is f = 1 / 2π (LC) ^1/2 where L is the inductance and C is the capacitance. Therefore, the substrate GND 12a and the slide module 30 are set so that f is, for example, 1 GHz or less. L and C are determined based on the interval. For example, the smaller the interval, the smaller L, so C is determined to be larger.

  As a result of the simulation, it was effective to adjust the resonance frequency by the current loop to about 900 MHz to 1 GHz, which is slightly higher than that in the case of an 800 MHz band antenna.

  Next, the difference in effect between the present invention and the prior art will be described. In the prior art disclosed in Japanese Unexamined Patent Application Publication No. 2006-203806 (hereinafter referred to as Prior Art 1), in order to improve the antenna characteristics, a load is provided on the slide rail to broaden the antenna or change the radiation pattern. It is described. However, although the prior art 1 describes measures for improving antenna characteristics in the 2 GHz band, no indication is given regarding antenna characteristics in a band of 1 GHz or less.

  Recent mobile phones are becoming thinner and the distance between the main body side substrate 12 and the slide module 30 is also decreasing in a slide type mobile phone, but the effect becomes significant at a frequency of 1 GHz or less.

  As described above with reference to FIG. 17, the antenna characteristics inevitably deteriorate when the interval is reduced, but the band around 800 MHz is greatly deteriorated while the 2 GHz band is slightly deteriorated. Prior art 1 does not present a solution to such a problem.

  In addition, as described above with reference to FIG. 16, the current flowing through the slide module 30 is out of phase with respect to the antenna current, and in particular, the anti-phase current is very strong under the antenna and under the antenna feeding point. It is difficult to control the reverse-phase current under such a situation where the capacitive coupling between metals is strong only by adjusting the impedance of the load as in the prior art 1.

  FIG. 24 is a diagram showing VSWR characteristics. The vertical axis represents VSWR and the horizontal axis represents frequency. The simulation result of each VSWR characteristic of the prior art 1 and the radio | wireless communication apparatus 1 of this invention in the band around 800 MHz is shown. As can be seen from the figure, the VSWR of the wireless communication device 1 is closer to 1 as compared with the prior art 1, indicating that the antenna characteristics are improved.

  On the other hand, the conventional technique (hereinafter referred to as Conventional technique 2) of Japanese Patent Application Laid-Open No. 2009-44326 has a configuration in which a resonance circuit is inserted. FIG. 25 is a diagram showing a state in which a resonance circuit is inserted. The substrate GND 12a and the slide module 30 are connected by one contact, and the resonance circuit 130 is inserted on the substrate GND 12a side.

  FIG. 26 is a diagram showing the VSWR characteristics. The vertical axis represents VSWR and the horizontal axis represents frequency. The simulation result of the VSWR characteristic of the prior art 1 and the VSWR characteristic of the prior art 2 is shown. As can be seen from the figure, the antenna characteristic of the conventional technique 2 in the band around 800 MHz is slightly improved compared to the conventional technique 1.

  FIG. 27 is a diagram illustrating a current flowing through the resonance circuit 130. The reason for the slight improvement in antenna characteristics in the band around 800 MHz compared to the prior art 1 is that in the prior art 2, the current amplified by the resonance is almost closed inside the resonance circuit 130 and the current flowing through the substrate GND 12a. This is because it does not lead to a major change.

  On the other hand, in the wireless communication device 1 of the present invention, two contact points 41 and 42 are provided between the substrate GND 12a and the slide module 30, and a capacity is loaded on one contact point 42 so that the main body side main substrate 12 is loaded. -1 substrate GND 12a itself is formed into a resonance circuit.

  Thereby, since the negative phase current can be changed greatly, the negative phase current can be moved to the contact side by installing the contacts 41 and 42 at locations away from the antenna 11 and the antenna feeding point 11a. As a result, the antenna characteristics can be greatly improved as compared with the above-described conventional techniques 1 and 2.

  Next, a modified example will be described. The modification has a configuration in which the C component is generated by replacing the contact 42 loaded with a capacitor with a coupling conductor. Since the C component appears in the portion where the metals are close to each other, this C component is used instead of actually loading the capacity. Specifically, the coupling conductor is connected to the substrate GND 12a, and the slide module 30 and the coupling conductor are brought close to each other to generate the C component.

  FIG. 28 is a diagram showing the positions of contact points and coupling conductor installation locations as seen from the main body side substrate 12, and FIG. 29 is a diagram showing the positions of contact points and coupling conductor installation locations as seen from the slide module 30. In order to form a current loop between the substrate GND 12a and the slide module 30, a contact 41 and a coupling conductor installation location 42a are provided. The substrate 41 and the slide module 30 are connected to the contact 41 by a conductor. A coupling conductor is installed at the coupling conductor installation location 42a.

  FIG. 30 is a diagram illustrating an example of a coupling conductor. For the coupling conductor 42a-1, for example, a flexible board (a flexible and deformable printed board) is used. In this case, the coupling conductor (flexible substrate) 42 a-1 is connected to the substrate GND 12 a and is stretched to the vicinity of the metal surface of the slide module 30 to be coupled. In the case of the figure, the flexible substrate 42 a-1 is deformed into a U shape, and the coupling surface 4 of the flexible substrate 42 a-1 is brought close to the slide module 30.

  FIG. 31 is a diagram showing a configuration in which a coupling conductor is installed. A flexible board 42a-1 is installed between the main body side main board 12-1 (board GND 12a) and the slide module 30, and the distance d between the coupling surface 4 of the flexible board 42a-1 and the slide module 30 is kept constant. To do.

  For example, when resonating at 1 GHz, the interval d is set to about 0.2 to 0.3 mm. With such a configuration, it is possible to generate a C component between the substrate GND 12a and the slide module 30, and it is possible to obtain substantially the same effect as when the capacity is actually loaded.

  FIG. 32 is a diagram showing the VSWR characteristics. The vertical axis represents VSWR, the horizontal axis represents frequency, and the VSWR of the prior art 1 and the VSWR of the above-described modification are shown below the 1 GHz band. As can be seen from the figure, the modified example improves the VSWR characteristics.

  As described above, the wireless communication device 1 has a configuration in which at least two contacts are provided between the ground of the substrate to which the antenna is connected and the slide module, and a capacity is loaded on one contact. As a result, the peak position of the reverse-phase current flowing through the slide module can be moved from the antenna vicinity region to the contact side, and the antenna characteristics can be improved.

  In addition, although the case where the radio | wireless communication apparatus 1 was applied to the slide type mobile phone was demonstrated above, not only a slide type mobile phone but a metal part exists in the vicinity of an antenna, and flows through GND of the board | substrate to which an antenna is connected. The present invention is applicable to all wireless devices in which the current and the current flowing through the metal portion are in a reverse phase relationship.

  That is, for such a wireless device, at least two contacts are provided between the metal part and the GND of the substrate to which the antenna is connected, and a capacitor is loaded on one contact to resonate the substrate GND. Thus, by separating the current peak position from the antenna, the antenna characteristics can be improved.

  As mentioned above, although embodiment was illustrated, the structure of each part shown by embodiment can be substituted by the other thing which has the same function. Moreover, other arbitrary structures and processes may be added.

DESCRIPTION OF SYMBOLS 1 Wireless communication apparatus 10 1st housing | casing 11 Antenna 12 Board | substrate 12a Board | substrate GND
20 Second housing 30 Slide module 41, 42 Contact

Claims (5)

A first housing including a substrate on which an antenna is mounted;
A second housing;
A slide module that slides the second housing relative to the first housing;
With
Providing at least two contact points between the ground of the substrate and the slide module, and loading one of the contact points with a capacity;
A wireless communication apparatus.   2. The wireless communication apparatus according to claim 1, wherein, in the slide open state, the contact point is provided in a region where the substrate and the slide module overlap with each other and away from the antenna.   By providing the contact, resonance is generated by the inductance component of the current loop formed between the ground of the substrate and the slide module and the capacitance component of the capacitance, and the peak position of the current flowing through the slide module is determined. The wireless communication apparatus according to claim 1, wherein the wireless communication apparatus is moved from the vicinity of the antenna to the contact side.   The wireless communication apparatus according to claim 1, wherein the contact for loading the capacitor is a coupling conductor. An antenna,
A substrate to which the antenna is connected;
With
When there is a metal part in the vicinity of the antenna, at least two contact points are provided between the metal part and the ground of the substrate, and a capacity is loaded on one of the contact points.
A wireless communication apparatus.

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