JP2002305461A - Radio communication module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compact radio communication module, having an antenna that is compact and which can obtain improved radiation characteristics and gain. SOLUTION: An antenna, a radio communication circuit section, that is connected to the antenna and transmits or receives electric waves, and a communication control circuit section that controls the operation of the radio communication circuit section, and at the same time, executes a series of communication procedures with a communication party are composed on the same printed circuit board 11. A linear conductive foil, whose one end is open, is provided on the printed circuit board; loop-shaped conductive foil, whose one end is connected to the ground is provided on the opposite surface of the printed circuit board or the surface for holding the linear conductive foil surface and the insulating surface, with the other end of the linear conductive foil and that of the loop-shaped conductive foil being connected electrically; and the end at the side, that is connected electrically, is set to a power feed point in the radio communication module.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless communication module which is incorporated in a white goods or the like and constructs a home communication network.

[0002]

2. Description of the Related Art Conventionally, a radio communication module of this type has an antenna, a radio communication circuit section for transmitting and receiving radio waves, and a communication control section for performing communication control, each configured as an independent unit, and is configured on the same printed circuit board. There were few things being done. Even when the three blocks are configured on the same printed circuit board, the antenna provided on the printed circuit board is configured in a loop shape, has a small dipole structure, or has a zigzag shape as shown in FIG. Those having a simple pattern were used. In FIG. 4, 1 is a printed board, 2 is a shield plate, 3 is an antenna made of copper foil on the printed board, and 4 is a communication control circuit unit. The wireless communication circuit is covered with a shield plate 2.

[0003]

However, when the antenna size is smaller than the wavelength, the conventional wireless communication module cannot obtain a sufficient antenna gain. However, there is a problem that the communication distance is shortened.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and comprises an antenna, a radio communication circuit unit connected to the antenna for transmitting and receiving radio waves, and a communication device for controlling the operation of the radio communication circuit unit. A communication control circuit unit for executing a series of communication procedures with a partner is configured on the same printed circuit board, and the antenna is provided with a linear conductor foil having one end open on the printed circuit board, A loop-shaped conductor foil, one end of which is connected to ground, is provided on the surface opposite to the linear conductor foil surface or on the surface sandwiching the linear conductor foil surface and the insulating layer. The end is electrically connected to the other end of the loop-shaped conductor foil, and the end on the side where the electric connection is made is used as a power supply point.

[0005] According to the above invention, a compact and high-performance antenna can be realized by the synergistic effect of the loop-shaped conductor foil and the linear conductor foil, so that a compact and highly reliable wireless communication module can be provided. Become like

[0006]

A wireless communication module according to a first aspect of the present invention includes an antenna, a wireless communication circuit unit connected to the antenna for transmitting and receiving radio waves, and a communication unit for controlling the operation of the wireless communication circuit unit. The communication control circuit unit for executing a series of communication procedures with the other party is configured on the same printed circuit board, and the antenna is provided with a linear conductive foil having one end open on the printed circuit board, A loop-shaped conductor foil, one end of which is connected to the ground, is provided on the opposite surface of the substrate or the surface between the linear conductor foil surface and the insulating layer, and the other end of the linear conductor foil and the loop conductor The other end of the foil is electrically connected, and the end on the electrically connected side is used as a feeding point.

[0007] The synergistic effect of the loop-shaped conductor foil and the linear conductor foil makes it possible to realize a small-sized and high-performance antenna, so that a small-sized wireless communication module with high communication reliability can be obtained. .

In the wireless communication module according to a second aspect of the present invention, the linear conductive foil constituting the antenna and having one open end is disposed so as to be bent along the end surface of the printed circuit board.

Since the printed circuit board surface is effectively used, it contributes to downsizing of the wireless communication module and obtains a good antenna gain.

[0010] In the wireless communication module according to the third aspect of the present invention, a part of the loop-shaped conductor foil, one end of which is connected to the ground, constituting the antenna is parallel to the linear conductor foil whose one end is open. Are located.

[0011] Then, the shape can be made smaller and a good antenna gain can be obtained.

A wireless communication module according to a fourth aspect of the present invention is provided with a shield plate so as to cover the wireless communication circuit section and the communication control circuit section.

[0013] Since the circuit section is housed in one housing, the shape of the wireless communication module can be made smaller and a good antenna gain can be obtained.

[0014]

(Embodiment 1) An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram of a wireless communication module showing an embodiment of the present invention. In FIG. 1, 11 is a printed circuit board, 12 is a shield plate, and 13 and 14 are antennas made of copper foil on the printed circuit board. 15 is a through hole. The shield plate 12 is a printed circuit board 11
And is connected to a circuit ground (hereinafter referred to as GND). On the printed board 11, a GND and a circuit pattern are formed by copper foil, and circuit components are mounted.
The shield plate 12 is attached so as to cover the circuit components. Shield plate 12 formed on printed circuit board 11
A circuit pattern covered with a wireless communication circuit unit connected to the antenna 13 for transmitting and receiving radio waves, and a communication control circuit unit for controlling the operation of the wireless communication circuit unit and executing a series of communication procedures with a communication partner It is. The communication control circuit section is constituted by a microcomputer. The antenna 13 is connected to a wireless communication circuit unit mounted in the shield plate 12 with a copper foil. The antennas 13 and 14 are connected by a copper foil. By connecting the antenna 13 and the antenna 14 with a copper foil, the antenna is bent from the antenna 13 to the antenna 14 along the end surface of the printed circuit board 11.

FIG. 2 is a view of the back surface of the printed circuit board of FIG. However, FIG. 2 is a view in which the back surface is seen through from the front surface. In FIG. 2, reference numeral 21 denotes a printed circuit board, which shows the back surface of the printed circuit board 11. Reference numeral 22 denotes a shield plate disposed on the back surface of the printed circuit board 21. 23 and 2
4 is an antenna. Reference numeral 25 denotes a through hole, which is the same as the through hole 15 shown in FIG. Reference numeral 26 denotes a connection point between the antenna 23 and GND. Reference numeral 27 denotes a through hole, which connects the antenna 14 and the antenna 24 shown in FIG. On the printed circuit board 21, GND and a circuit pattern are formed by copper foil. The circuit components are not mounted on the back surface shown in FIG. The shield plate 22 is attached so as to cover the circuit pattern. Antenna 2
3 is connected to the antenna 13 of FIG. Another end of the antenna 23 is connected to GND at 26.

Antenna 13, Antenna 14, Antenna 2
3. One antenna is composed of the antenna 24. Here, the antennas 13, 14, and 24 are linear antennas, and the antenna 23 corresponds to a loop antenna. The antenna 13 and the antenna 23 are arranged in parallel on the front and back of the substrate as shown in FIGS.

As described above, the wireless communication module according to the present invention comprises a series of an antenna, a wireless communication circuit unit connected to the antenna for transmitting and receiving radio waves, and controlling the operation of the wireless communication circuit unit and communicating with a communication partner. The communication control circuit unit that executes the communication procedure is configured on the same printed circuit board, and the antenna is provided with a linear conductor foil having one end opened on the printed circuit board, and the opposite side of the printed circuit board or A loop-shaped conductor foil having one end connected to the ground is provided on the surface between the linear conductor foil surface and the insulating layer, and the other end of the linear conductor foil and the other end of the loop-shaped conductor foil are provided. Are electrically connected, and the end on the side of the electrical connection is used as a power supply point. Then, a small-sized wireless communication module with high communication reliability can be obtained.

In the wireless communication module according to the present invention, the linear conductive foil constituting the antenna and having one open end is disposed so as to be bent along the end surface of the printed circuit board. And because the printed circuit board surface is used effectively, it contributes to the miniaturization of the wireless communication module,
A good antenna gain can be obtained.

Further, in the wireless communication module according to the present invention, a part of the loop-shaped conductor foil, one end of which is connected to the ground, constituting the antenna is arranged in parallel with the linear conductor foil whose one end is open. . And the shape can be made smaller,
In addition, a good antenna gain can be obtained.

In addition, the wireless communication module of the present invention has a shield plate so as to cover the wireless communication circuit section and the communication control circuit section. Then, since the circuit portion is housed in one case, the shape of the wireless communication module can be made smaller and a good antenna gain can be obtained.

FIG. 3 shows the characteristics of the antenna of this embodiment.
The characteristics shown in FIG. 3 are obtained by actually forming antennas having the shapes shown in FIGS. 1 and 2 on a printed circuit board and actually measuring the antenna characteristics. FIG. 3A shows radiation characteristics on a plane parallel to the ground when the antenna 13 is arranged perpendicular to the ground. In the figure, reference numeral 41 indicates the characteristic of vertical polarization, and reference numeral 42 indicates the characteristic of horizontal polarization. As is apparent from the figure, the antenna shows almost no directivity in vertical polarization, and has an antenna gain of -5d.
A good characteristic of Bd is realized. FIG. 3B shows radiation characteristics on a plane parallel to the ground when the antenna 14 is arranged perpendicular to the ground. In the figure, reference numeral 43 denotes the characteristic of vertical polarization, and reference numeral 44 denotes the characteristic of horizontal polarization. As is clear from the figure, the figure shows a figure-eight characteristic similar to that of a dipole antenna in horizontal polarization. As is clear from FIG. 3, in the antenna of this embodiment, the linear antenna 13 and the loop antenna 23 function as main antennas, and most of the energy is radiated from the antenna 13 and the antenna 23. The linear antenna 14 and the antenna 24 function as sub-antennas for assisting radiation of energy from the antennas 13 and 23.

In the embodiment shown in FIGS. 1 and 2, the antenna 14 and the antenna 24 are connected by using the through hole 27, but the antenna 24 and the through hole 2 are connected.
7 can be abolished.

The antenna 13 and the antenna 23 are connected by a through hole 25, and the antenna 14 and the antenna 24 are connected by a through hole 27.
Instead of the through hole 27, an electrical connection may be made by another method. For example, there is a method of passing a lead wire through a connection hole and soldering at both ends.

Also, instead of arranging the antennas 14 and 24 on the printed circuit board 11, equivalent performance can be obtained by arranging them on the outer periphery of the printed circuit board using metal wires (or metal pieces). In this case, the metal wire (or metal piece) is connected to the antenna 13 by means such as soldering.

[0025]

As described above, when the configuration of the present invention is used, it has the same radiation characteristics as a dipole antenna,
An antenna having a good antenna gain, a wireless communication circuit unit, and a communication control unit can be formed compactly on the same printed circuit board.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a surface of a wireless communication module according to an embodiment of the present invention.

FIG. 2 is a configuration diagram of a back surface of the wireless communication module according to the embodiment of the present invention;

3A is a characteristic diagram of the antenna 13 of the wireless communication module according to the embodiment of the present invention; FIG. 3B is a characteristic diagram of the antenna 14 of the wireless communication module according to the embodiment of the present invention;

FIG. 4 is a configuration diagram of a conventional wireless communication module.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Printed circuit board 12 Shield board 13 Antenna 14 Antenna 15 Through hole 21 Printed board 22 Shield board 23 Antenna 24 Antenna 25 Through hole 26 Connection point of antenna 23 and GND 27 Through hole 41, 43 Vertical polarization characteristic diagram 42, 44 Horizontal Polarization characteristics

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H05K 1/16 H05K 1/16 B 5K011 (72) Inventor Masafumi Nakagawa 1006 Odakadoma, Kadoma City, Osaka Matsushita Electric F-term (reference) in Sangyo Co., Ltd.

Claims (4)

[Claims] An antenna, a wireless communication circuit connected to the antenna for transmitting and receiving radio waves, and a communication control circuit for controlling the operation of the wireless communication circuit and executing a series of communication procedures with a communication partner. Are formed on the same printed circuit board, and the antenna is provided with a linear conductive foil having an open end on the printed circuit board, and the surface opposite to the linear conductive foil surface of the printed circuit board or the linear conductive foil is provided. A loop-shaped conductor foil having one end connected to the ground is provided on the surface between the conductor foil surface and the insulating layer, and the other end of the linear conductor foil and the other end of the loop-shaped conductor foil are electrically connected to each other. A wireless communication module, characterized in that the wireless communication module has a configuration in which the power supply point is used as a power supply point. 2. The wireless communication module according to claim 1, wherein the linear conductive foil forming one end of the antenna has an open end, and is disposed so as to be bent along an end surface of the printed circuit board. 3. The antenna according to claim 1, wherein a part of the loop-shaped conductor foil, one end of which is connected to the ground, constituting the antenna is arranged in parallel with the linear conductor foil whose one end is open. The wireless communication module according to any one of the preceding claims. 4. The wireless communication module according to claim 1, wherein a shield plate is provided so as to cover the wireless communication circuit section and the communication control circuit section.