JP2010028500A - Radio communication circuit and radio communication apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a radio communication circuit capable of achieving both of the miniaturization of the circuit and the acquisition of high antenna radiation characteristics, and to provide a radio communication apparatus which includes the radio communication circuit. <P>SOLUTION: The radio communication circuit includes a receiving circuit 14 formed on a substrate; an antenna 11 connected to the receiving circuit 14; and a conductor line 12 connected to a position A of a ground conductor 13a on the substrate, which exists within λ/40 (λ is the wavelength of radio frequency signal) from an antenna feeding end B of the antenna 11 and has a length of 0.9×λ/4(2n+1) to 1.1×λ/4(2n+1) (n is 0, or a positive integer). <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a wireless communication circuit having a receiving circuit with a high required level of reception sensitivity, such as a GPS receiving circuit and a digital TV receiving circuit, and a wireless communication device including the wireless communication circuit.

  In recent years, in mobile devices such as mobile phones, a built-in antenna in which an antenna is housed in a housing has become mainstream. Further, in the built-in antenna, since the antenna is close to the ground pattern of the circuit board accommodated in the housing, the impedance is lowered and the band is narrowed. In the case of a monopole antenna, there is a problem that the radiation pattern is disturbed according to the size of the ground pattern of the circuit board.

  Here, since the open end line (stub) of a predetermined length functions as a ground / short circuit, the ground potential can be stabilized by connecting it to the ground pattern of the circuit board. If the ground potential is stabilized, the antenna radiation characteristic (gain) is improved, and the shielding property against noise of the wireless communication circuit is also improved. As a result, the performance of the wireless communication circuit, particularly the reception sensitivity is improved. (See Patent Documents 1 and 2.)

  For example, in Patent Document 1, an L-shaped elongated plate having one end connected to this surface is provided on the ground surface of the circuit board, and the current flowing through the ground pattern of the circuit board is reduced by this plate, thereby degrading directivity characteristics. A configuration to reduce is proposed.

  Further, in Patent Document 2, an impedance characteristic and a radiation characteristic are provided by providing a conductor having a length of a quarter wavelength of a radio frequency signal at a position separated by a quarter wavelength from a connection point between a radio circuit and an antenna. A configuration that can improve the bandwidth and increase the bandwidth has been proposed.

  However, there are cases in which good antenna radiation characteristics cannot be obtained with either configuration.

JP 2000-40910 A JP 2008-17352 A

  The present invention has been made in view of the above problems in the prior art, and includes a wireless communication circuit capable of achieving both a reduction in circuit size and good antenna radiation characteristics, and the wireless communication circuit. An object is to provide a wireless communication device.

  The present invention provided to solve the above problems includes a receiving circuit (wireless receiving circuit 14) provided on a substrate (substrate 13), an antenna (antenna 11) connected to the receiving circuit, and a ground conductor on the substrate. The length of the (substrate ground plane 13a) connected to a position (ground connection point A) within λ / 40 (λ is the wavelength of the radio frequency signal) from the antenna feeding end (antenna feeding end B) of the antenna. 0.9 × λ / 4 (2n + 1) or more and 1.1 × λ / 4 (2n + 1) or less (n is 0 or a positive integer) conductor wire (conductor wire 12), and a wireless communication circuit (wireless communication) Circuit 10) (FIGS. 3 and 4).

Here, it is preferable that the conductor wire is a flexible conductor wire.
The conductor wire is preferably a cable conductor of an earphone or a headphone.
Further, the receiving circuit is required to have a receiving sensitivity of −100 dB, and is suitable for a GPS receiving circuit or a digital TV receiving circuit, for example.

  In addition, the present invention provided to solve the above-described problems includes a receiving circuit provided on a substrate, an antenna connected to the receiving circuit, and a ground conductor on the substrate, λ / 40 (λ Is connected to a position within the wavelength of the radio frequency signal), and the length is 0.9 × λ / 4 (2n + 1) or more and 1.1 × λ / 4 (2n + 1) or less (n is 0 or a positive integer) And a conductor wire, and a wireless communication device having a wireless communication circuit.

  Here, it is preferable to have a battery folder (battery folder 22) to which a dry battery (dry battery E) is attached to be a power source, and the conductor wire is a negative electrode (negative electrode 12e) of the battery folder (FIG. 9). , FIG. 10).

According to the wireless communication circuit of the present invention, the reference ground of the antenna can be stabilized by connecting a conductor wire of an appropriate length to a ground conductor (such as a ground surface of a circuit board) near the antenna feeding end. Therefore, it is possible to achieve both reduction in circuit size and acquisition of good antenna radiation characteristics.
In addition, according to the wireless communication device of the present invention, since the wireless communication circuit of the present invention is employed, the apparatus can be reduced in size and performance.

FIG. 1 shows a schematic diagram of a quarter-wavelength open end line (stub).
As shown in FIG. 1, the open end line (stub) of a quarter wavelength has an open end (open) and a connection end functions as a ground / short, so this is used as a reference ground for an antenna feed line. By connecting to the ground pattern (ground conductor) of the substrate, the ground potential at the connection point can be stabilized. This is as described in Patent Documents 1 and 2.

  However, even if the potential is stable at a part of the ground conductor, the ground potential near the antenna feed end fluctuates and the electromagnetic transmission is disturbed (disturbance means that quasi-TEM transmission is not performed) There was a problem that good antenna radiation characteristics could not be obtained.

  The inventor has addressed this problem in the configuration shown in FIG. 2 in that the stability of the ground has the greatest influence on the antenna radiation characteristics among the reference ground (ground conductor) of the feed line and the antenna feed end. Based on the knowledge that it is in the vicinity, intensive studies were made to improve the device in a limited space of miniaturization of the device, and the present invention was achieved.

  Hereinafter, a configuration of an embodiment of a wireless communication circuit and a wireless communication device according to the present invention will be described. The present invention will be described with reference to the embodiment shown in the drawings, but the present invention is not limited to this, and can be appropriately changed according to the embodiment. -As long as an effect is produced, it is included in the scope of the present invention.

  FIG. 3 shows a basic conceptual diagram of a wireless communication circuit according to the present invention. In other words, in the present invention, the conductor wire 12 (quarter wavelength tip open) of an appropriate length is provided to a predetermined portion (ground connection point) A in the vicinity of the antenna feeding end B on the ground conductor (substrate ground surface 13a). The connection end 12s of the line is connected to stabilize the ground potential at that portion, thereby obtaining good antenna radiation characteristics.

FIG. 4 shows a configuration example of a wireless communication circuit according to the present invention. The wireless communication circuit refers to a wireless communication circuit module or a wireless communication circuit block, and FIG. 4 shows a mode of a wireless reception circuit module (GPS circuit module) in which a patch antenna is mounted on a substrate.
The wireless communication circuit 10 according to the present invention includes a receiving circuit 14 provided on a substrate 13, an antenna 11 connected to the receiving circuit 14, and a ground conductor (ground surface 13 a) on the substrate 13 from a feeding end B of the antenna 11. The connection end 12s is connected to a position (ground connection point) A within λ / 40 (λ is the wavelength of the radio frequency signal), and the length is 0.9 × λ / 4 (2n + 1) or more, 1.1 × λ / 4 (2n + 1) or less (n is 0 or a positive integer).

  Here, the antenna 11 may be any type of antenna used in a wireless communication device. For example, a patch antenna, a rod antenna, a monopole antenna, a multilayer chip antenna (an inverted F antenna, a meander line antenna, etc.), and the like can be given.

  The antenna 11 may be a connector mounted on the same board as the circuit module, a pattern configured on the same board, or a completely different component or a different board as shown in FIG. In addition, any aspect of the aspect in which the module is connected to the antenna feeding point of the module by a contact pin or the like may be used.

  FIG. 5A shows the configuration of the antenna 11 used in FIG. Here, a configuration of a patch antenna using a degenerate separation method for exciting circularly polarized waves at one feeding point (one feeding) for GPS mounted on a mobile device such as a mobile phone, a PDA, and a handy game machine. Is shown. Specifically, the antenna 11 includes a dielectric 11s made of ceramics, a rectangular patch 11a that is an antenna radiation surface (conductor) provided on the dielectric 11s, and one end soldered to the center of the patch 11a. A feeding line 11d that is a lead wire that has two feeding points 11b and the other end penetrates the dielectric 11s and protrudes to the back surface side, and an antenna ground surface 11c that is a conductor layer provided on the back surface side of the dielectric 11s; Similarly, a conductor-line feed land 11e provided on the back surface side of the dielectric 11s and receiving the feed line 11d.

  The ground serving as the reference potential of the antenna 11 is the antenna ground surface 11c provided on the back surface of the dielectric 11s (or the ground surface of the inner layer of the antenna substrate, or the module substrate if the antenna is mounted on the module substrate). Surface or inner ground plane). However, it is a requirement on antenna characteristics (VSWR, gain, efficiency, etc.), the ground plane size standard, the distance from the feed point to the end of the ground plane is ¼ wavelength or more, from end to end of the ground plane It is practically difficult to satisfy a wavelength of 1/2 wavelength or more. This is because a large substrate that can form such a ground plane does not fit in a set housing of a mobile device. The present invention is effective for this problem.

FIG. 5B shows a substrate configuration of the wireless reception circuit module.
On the surface (front surface) on which the antenna 11 is mounted on the substrate 13 that is a dielectric, a substrate ground surface 13a that is a conductor layer, a receiving land 13b that is a conductor layer that receives the feeder 11d, and a substrate ground surface 13a. And a resist layer 13r for protecting the receiving land 13b. At this time, the substrate ground surface 13a is a solid ground pattern, but the ground pattern is removed only at a portion through which the feeder line 11d passes, and a receiving land 13b in a state insulated from the ground pattern (substrate ground surface 13a) is formed. ing. The substrate 13 is a multilayer substrate.

  In the substrate ground surface 13a, a via-hole connection 12b penetrating the substrate 13 is provided at a ground connection point A within a distance x from the antenna feeding end B that is an end of the receiving land 13b. Here, the distance x is λ / 40 (λ is the wavelength of the radio frequency signal).

  The true position in the ground conductor near the antenna feeding end is the position A ′ on the antenna ground surface 11 c of the antenna 11 (FIG. 5A). However, it is physically impossible to provide the conductor wire 12 on the antenna ground plane 11c. In the present invention, since the antenna ground surface 11c of the antenna 11 and the substrate ground surface 13a of the substrate 13 are electromagnetically coupled, the position A and the position A ′ are considered to be substantially equivalent, and the conductor wire 12 is provided at the position (ground connection point) A. ing.

  A sheet metal piece 12a is connected to a via-hole connection (through-hole conductor line) 12b on the back side of the substrate 13 by soldering. At this time, the combination of the sheet metal piece 12a and the via hole connection 12b is a conductor wire 12, and the length of the conductor wire 12 is 0.9 × λ / 4 (2n + 1) or more and 1.1 × λ / 4 (2n + 1) or less. (N is 0 or a positive integer). Here, the length of the conductor line 12 (line length) is set so that the electrical length becomes a quarter wavelength (λ / 4 (2n + 1)) in consideration of the parasitic capacitance between the conductor lines 12 and the like. Although it is most preferable, “quarter wavelength” ± “10%” is allowed. This is because the influence of the line length within ± 10% can be ignored in the distributed constant line.

  The substrate 13 is provided with a hole 13d penetrating from the receiving land 13b to the back surface side, and the signal line of the conductor layer also serving as the receiving land for receiving the power supply line 11d at the position of the hole 13d on the back surface side of the substrate 13 is provided. 13c is provided. Further, a receiving circuit 14 such as a GPS circuit connected to the signal line 13 c is provided on the back surface of the substrate 13. The present invention is suitable for a receiving circuit having a high required level of receiving sensitivity that requires −100 dB as receiving sensitivity. Examples of the receiving circuit 14 include a GPS receiving circuit and a digital TV receiving circuit.

  In manufacturing the wireless communication circuit 10 according to the present invention, first, the antenna 10 shown in FIG. 5A and the substrate 13 of the wireless reception circuit module shown in FIG. 5B are respectively manufactured, and then the wireless reception is performed. The antenna 10 is mounted by inserting the feeder line 11d of the antenna 10 into the hole 13d of the substrate 13 of the circuit module, and soldering the feeder line 11d on the back side of the substrate 13, thereby completing the wireless communication circuit 10. To do.

  As described above, by connecting the conductor wire 12 having an appropriate length to the ground connection point A at a predetermined position in the vicinity of the antenna feeding end B on the ground conductor (the ground surface 13a of the circuit board), the reference ground of the antenna 11 can be obtained. Thus, the circuit can be reduced in size and good antenna radiation characteristics (VSWR, gain, efficiency, etc.) can be ensured.

  In the wireless communication circuit 10 of FIG. 4, a part of the conductor wire 12 shows a form in which the sheet metal piece 12 a protrudes from the back surface of the substrate 13 (FIG. 6A). It is good also as a thin conductor wire (FIG.6 (b)).

  In FIG. 6B, a substrate ground surface 13a, a conductor line 11d, and a signal line 13c connected thereto are provided on the back surface of the substrate 13. On the substrate ground surface 13a, the connection end 12s of the conductor wire 12 which is a conductor thin wire is connected to a ground connection point A at a predetermined position near the power supply end B of the antenna 11 in the signal line 13c. Since the thin wire conductor is flexible, it can be accommodated in a gap between the substrate and the parts in the set housing, so that it does not hinder the downsizing and thinning of the set. In that case, an insulating film such as vinyl or Teflon (registered trademark) may be attached to the thin wire conductor so as not to short-circuit the peripheral circuit.

  Moreover, since the cable conductor of the earphone or the headphone used in applications such as DTV and radio tuner is a thin conductor wire, the cable conductor may also be used as the conductor wire 12 of the present invention.

  By the way, in the wireless communication circuit of FIG. 3, it is preferable that at least one other conductor line 12 'is connected to the ground conductor (substrate ground surface 13a) in the vicinity of the path of the antenna feeder line 11d. FIG. 7 shows an example of the configuration.

  By adding a conductor line 12 ′, which is a quarter-wavelength open end line, in the vicinity of the antenna feed line 11d, the electromagnetic transmission characteristics are stabilized not only at the antenna feed line B but also throughout the feed line 11d. The radiation characteristics of the antenna can be further improved.

  As shown in FIG. 8, the fluctuation of the potential generated in the ground (substrate ground surface 13a) that runs parallel to the antenna feeding line 11d is synchronized with the standing wave of the feeding line 11d. This is because the fluctuation can be suppressed if another stub (conductor line 12 ′) is attached at a position less than a half wavelength from the antenna feeding end B, which is (minimum amplitude).

  At this time, it is most effective at a position of a quarter wavelength from the antenna feeding end B corresponding to a standing wave peak (maximum amplitude). That is, the distance Y between the conductor wire 12 and the conductor wire 12 ′ on the substrate ground surface 13a needs to be λ / 2 >> Y (λ is the wavelength of the radio frequency signal), and Y = λ / 4 is most preferable. .

Next, a wireless communication device according to the present invention will be described.
A wireless communication device according to the present invention is equipped with the wireless communication circuit 10 described above. Examples of the wireless communication device include a mobile phone (including one that can watch 1Seg broadcasting), a smart phone, a GPS-equipped PDA, and the like.

FIG. 9 shows a configuration example (1) of the wireless communication device according to the present invention.
As shown in FIG. 9, the wireless communication device 100 includes a dry battery E mounted on the wireless communication circuit 10 of the present invention, other circuits 21 such as a microcomputer, a memory, and a power source, and the negative electrode 12e and the positive electrode 22p that are spring springs. And a battery folder 22 serving as a power source for the other circuit 21, and the conductor wire 12 in the wireless communication circuit 10 serves as the negative electrode 12 e of the battery folder 22.

  Here, one end of the spring spring of the negative electrode 12e is fixed by soldering after being inserted into the via hole connection 12b. At this time, the combination of the negative electrode 12e and the via hole connection 12b is a conductor wire 12, and the length of the conductor wire 12 is 0.9 × λ / 4 (2n + 1) or more and 1.1 × λ / 4 (2n + 1) or less ( n is 0 or a positive integer).

  The substrate ground plane 13a is provided with a via-hole connection 12b penetrating the substrate 13 at a position (ground connection point) A within the distance λ / 40 (λ is the wavelength of the radio frequency signal) from the antenna feeding end B described above. ing.

FIG. 10 shows a configuration example (2) of the wireless communication device according to the present invention.
The wireless communication device 100 includes a wireless communication circuit 10 according to the present invention and a battery folder 22 that has a dry battery attached to a negative electrode 12e and a positive electrode 22p, which are spring springs, and serves as a power source. The conductor wire 12 in the circuit 10 is the negative electrode 12 e of the battery folder 22.

  Here, the antenna 11 is a rod antenna extending from the set housing 101 to the outside, and one end of the antenna 11 is connected to a sheet metal 11f serving as an antenna feeding point in the set housing 101 (FIG. 10A). , (B)).

FIG. 10C shows the configuration of the substrate 13 viewed from the back side (C side in the figure) of the wireless communication device 100 in FIG.
On the back surface of the substrate 13, an antenna feeding point land 13e is provided at a position corresponding to the sheet metal 11f when mounted, and a pogo pin 13f as a contact probe is mounted on the land 13e. The land 13e is connected to the receiving circuit 14 through a signal line. Thus, when the substrate 13 is mounted on the set 101, the pogo pin 13f contacts the sheet metal 11f, and the antenna 11 is connected to the receiving circuit 14 via the sheet metal 11f, the pogo pin 13f, and the land 13e (FIG. 10 ( a)). The position where the pogo pin 13f of the land 13e is provided is the antenna feeding end B referred to in the present invention.

FIG. 10D shows the configuration of the substrate 13 as viewed from the front side (D side in the figure) of the wireless communication device 100 in FIG.
On the front surface of the substrate 13, a substrate ground surface 13a having a predetermined ground pattern, a negative electrode 12e as a spring spring, and a positive electrode 22p formed by bending a conductor plate are provided.

  Here, the minus electrode 12e is fixed at the same position or in the vicinity thereof with the antenna feeding end B and the substrate 13 interposed therebetween. In this configuration, the negative electrode 12e becomes the conductor wire 12, and the length of the spring spring that is the negative electrode 12e is 0.9 × λ / 4 (2n + 1) or more and 1.1 × λ / 4 (2n + 1) or less (n is 0 or a positive integer).

  In addition, since the root of the negative electrode 12e (conductor wire 12) is the ground connection point A and the position A and the antenna feeding end B face each other across the substrate 13, the ground connection point A and the antenna feeding end B are As a distance, the thickness of the substrate 13 is set to λ / 40 (λ is the wavelength of the radio frequency signal) or less.

FIG. 11 shows another configuration of the substrate 13 as viewed from the front side (D side in the figure) of the wireless communication device 100 in FIG.
On the front surface of the substrate 13, a substrate ground surface 13a having a smaller ground pattern than in the case of FIG. 10D and the same position with the antenna feeding end B and the substrate 13 sandwiched between the substrate ground surface 13a. Alternatively, a conductive line 12f that is a coplanar line or a microstrip line formed on the substrate 13 from a position (ground connection point) A in the vicinity thereof, and a negative electrode 12e that is a spring spring are provided.

  In this configuration, the combination of the negative electrode 12e and the conductive line 12f becomes the conductor line 12, and the sum of the length L1 of the spring spring as the negative electrode 12e and the line length L2 of the conductive line 12f is 0.9 × λ / 4 ( 2n + 1) or more and 1.1 × λ / 4 (2n + 1) or less (n is 0 or a positive integer).

  Further, since the ground connection point A and the antenna feeding end B face each other with the substrate 13 interposed therebetween, the thickness of the substrate 13 is λ / 40 (λ is wireless) as the distance between the ground connection point A and the antenna feeding end B. Frequency signal wavelength) or less.

  As factors that make the ground potential of the wireless communication circuit unstable, (1) certain parts become noise sources, and (2) in mobile sets, the ground plane is actually grounded. In addition, there are two aspects that it is easy to be excited by noise (ΔI noise or noise from peripheral circuits) because it is small and small. In the present invention, the radio communication circuit 10 shown in FIG. 3 and FIG. 7 is a countermeasure for the above (2), but the radio communication device 100 shown in FIG. 9 and FIG. This is a countermeasure for both (2). That is, the most important noise source is the power supply circuit. By stabilizing the potential of the battery electrode ground in the vicinity of the circuit, the ground excitation of the power supply circuit is suppressed from the original, and the ground potential is further stabilized. Is possible.

  In addition, the spring spring of the battery electrode usually electromagnetically couples with the antenna and remarkably deteriorates the radiation characteristics of the antenna. However, the inductivity of the spring spring is capacitive by making the electrical length a quarter wavelength. There is also a secondary effect of canceling out and preventing the coupling between the antenna and the electromagnetic coupling. If the battery electrode is not a spring spring but a low-impedance leaf spring, the antenna and the electromagnetic coupling do not occur, but the leaf spring has a smaller stroke and is more easily plastically deformed than the spring spring. Therefore, there is a high risk of causing a malfunction when the set is vibrated or dropped, which is not preferable.

Hereinafter, test examples for verifying the wireless communication circuit of the present invention will be shown.
(Test Example 1)
In the wireless communication circuit 10 (GPS module with antenna) of FIG. 4, the antenna characteristic (VSWR (voltage standing wave ratio)) is changed by changing the distance x between the ground connection point A and the antenna feeding end B under the following conditions. It was measured. In the measurement, measurement was performed by connecting a measurement cable to the signal line 13c instead of the reception circuit 14.

[Test conditions]
(1) Antenna 11
Patch antenna (2) board 13
・ Material: Glass epoxy (FR-4)
-External dimensions: 34 mm square-Board ground surface 13 a: 34 mm square (solid ground)
(3) Radio frequency signal / GPS carrier frequency 1.57542 GHz
(4) Distance x
・ Change in the range of x = 0.8-20mm.

  When the conductor wire 12 was not provided, the distance from the antenna feeding end B to the end of the substrate ground plane was 21 mm at the maximum, which was smaller than λ / 4 = 47.6 mm, and the VSWR was not good. When actually measured, VSWR was 5.2 (initial value).

FIG. 12 shows the measurement results of Test Example 1.
As a result, although VSWR ≦ 2 when x / λ = 0.025 or less, VSWR suddenly increases as VSWR exceeds 2 from the vicinity where x / λ exceeds 0.025, and thereafter x / λ increases. Became worse. That is, in order to suppress the VSWR of the wireless communication module (GPS) with an antenna having an insufficient ground size and unstable characteristics (high VSWR) to 2 or less, which is usually referred to as a practical range, the connection position of the conductor wire 12 (ground connection) The point A) must be within λ / 40 (= 0.025λ) from the nearest point (antenna feed end B) of the antenna feed point.

(Test Example 2)
In the wireless communication device 100 shown in FIG. 9, the change in GPS reception sensitivity was investigated by changing the length of the conductor wire 12 under the following conditions. The length of the conductor wire 12 is the combined length of the negative electrode 12e and the via hole connection 12b.
[Test conditions]
(1) Antenna 11
Patch antenna (2) board 13
・ Material: Glass epoxy (FR-4)
Board ground surface 13a: solid ground (3) radio frequency signal GPS carrier frequency 1.57542 GHz
(4) Conductor wire 12 length L
-Change in the range of L = 32.6-61.6 mm.

FIG. 13 shows the measurement results of Test Example 2. Here, regarding the length L of the conductor wire 12, when the length is λ / 4 = 47.6 mm, the length is 100%, and the difference (%) in length from that is expressed as a deviation from λ / 4 on the horizontal axis. it's shown.
As a result, reception is performed in a region where the length L of the conductor wire 12 is less than λ / 4-10% (= 0.9 × λ / 4) or more than λ / 4 + 10% (1.1 × λ / 4). Sensitivity deteriorated extremely. In order to secure a practical level of GPS sensitivity of about −150 dBm, the length L of the conductor wire 12 is within λ / 4 ± 10% (that is, 0.9 × λ / 4 (2n + 1) or more, 1.1 Xλ / 4 (2n + 1) or less).

It is a schematic diagram of a 1/4 wavelength open end line (stub). It is a conceptual diagram which shows the basic composition of the radio | wireless communication circuit module with an antenna. It is a conceptual diagram which shows the basic composition (1) of the radio | wireless communication circuit which concerns on this invention. It is sectional drawing which shows the structural example of the radio | wireless communication circuit which concerns on this invention. FIG. 5 is a cross-sectional view illustrating a configuration of an antenna and a substrate in the wireless communication circuit of FIG. 4. It is a perspective view which shows the connection aspect of the conductor wire in the radio | wireless communication circuit of this invention. It is a conceptual diagram which shows the basic composition (2) of the radio | wireless communication circuit which concerns on this invention. It is a figure explaining the concept of the radio | wireless communication circuit of FIG. It is sectional drawing which shows the structure (1) of the radio | wireless communication apparatus which concerns on this invention. It is the schematic which shows the structure (2) of the radio | wireless communication apparatus which concerns on this invention. It is the schematic which shows the other structure of the board | substrate in the radio | wireless communication apparatus of FIG. It is a figure which shows the result of Test Example 1. It is a figure which shows the result of Test Example 2.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Wireless communication circuit, 11 ... Antenna, 11a ... Patch (antenna radiation surface), 11c ... Antenna ground surface, 11d ... Feed line, 11e, 13b, 13e ... Receiving land 11f ... sheet metal,
11s ... dielectric, 12, 12 '... conductor wire, 12a ... sheet metal piece, 12b ... via hole connection, 12e ... minus electrode, 12f ... conductive line, 12s ... connection End, 13 ... substrate, 13a ... ground conductor (substrate ground surface), 13c ... signal line, 13d ... through hole, 13f ... pogo pin, 13r ... resist layer, 14 ...・ Wireless reception circuit, 21... Other circuit, 22 ..Battery folder, 22 p... Plus electrode, 100... Wireless communication device, 101. B ... Antenna feed end

Claims (6)

A receiving circuit provided on the substrate;
An antenna connected to the receiving circuit;
The length of the ground conductor on the substrate is 0.9 × λ / 4 (2n + 1) or more, connected to a position within λ / 40 (λ is the wavelength of the radio frequency signal) from the feeding end of the antenna. .1 × λ / 4 (2n + 1) or less (n is 0 or a positive integer) conductor wire;
A wireless communication circuit comprising:   The wireless communication circuit according to claim 1, wherein the conductor wire is a flexible conductor thin wire.   The wireless communication circuit according to claim 1, wherein the conductor wire is a cable conductor of an earphone or a headphone.   The wireless communication circuit according to claim 1, wherein the receiving circuit is a GPS receiving circuit or a digital TV receiving circuit. A receiving circuit provided on the substrate;
An antenna connected to the receiving circuit;
The length of the ground conductor on the substrate is 0.9 × λ / 4 (2n + 1) or more, connected to a position within λ / 40 (λ is the wavelength of the radio frequency signal) from the feeding end of the antenna. .1 × λ / 4 (2n + 1) or less (n is 0 or a positive integer) conductor wire;
A wireless communication device having a wireless communication circuit. It has a battery folder that is powered by a dry cell,
The wireless communication device according to claim 5, wherein the conductor wire is a negative electrode of a battery folder.

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