JP2006140589A - Antenna structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide technology of greatly improving antenna characteristics such as a gain and a bandwidth by configuring a microwave circuit while effectively utilizing the space so as to increase the effective length of the antenna. <P>SOLUTION: A loop circuit is formed of: a circuit board 61 including wiring patterns; an antenna element 81 installed on the wiring patterns on the circuit board 61; and a metallic member 86 whose both ends are connected to the wiring patterns. The metallic member 86 is provided to a case 12 for housing the circuit board 61. Specifically, the antenna structure is provided with a first metallic member 86 provided to the inner side face of the case 12 and a second metallic member 84 which is provided to the wiring patterns, has elasticity, and is brought into contact with the first metallic member 86. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an antenna structure used for a portable wireless device.

In order to reduce the size and weight of portable radio devices typified by mobile phones, it is also required to reduce the size of the antenna portion. However, if the antenna is downsized, it greatly affects antenna performance such as bandwidth and gain, and it is very difficult to obtain sufficient performance.
Conventionally, a metal plate is often used alone as a small antenna. For example, there is an antenna element in which an electrode pattern is formed on a dielectric, and a conductive plate-like auxiliary element is attached (see Patent Document 1).
JP 2001-339226 A

  However, in the case of a small antenna using a single metal plate as in the prior art, the effective antenna length is small, and the antenna gain, bandwidth, and the like are limited compared to the loop antenna.

  An object of the present invention is to increase the effective antenna length by constructing a three-dimensional circuit while effectively using space, and to greatly improve antenna characteristics such as gain and bandwidth.

  In order to solve the above-described problems, the invention described in claim 1 includes a circuit board 61 having wiring patterns 82 and 83, and wiring patterns 82 and 83 on the circuit board 61 as shown in FIGS. The antenna structure is characterized in that a loop circuit is formed by an antenna element 81 installed on 83 and a metal member 86 having both ends connected to the wiring patterns 82 and 83.

According to the first aspect of the present invention, the three-dimensional loop antenna includes the wiring pattern and the antenna element on the circuit board and the metal member connected to both ends of the wiring pattern. The effective antenna length can be increased by the circuit.
Therefore, antenna characteristics such as gain and bandwidth can be greatly improved as compared with the antenna alone.

  A second aspect of the present invention is the antenna structure according to the first aspect, wherein, for example, as shown in FIGS. 3 and 6, the metal member 86 is provided in a housing 12 that houses the circuit board 61. It is characterized by being.

  According to the second aspect of the present invention, both ends of the metal member provided in the housing are connected to the wiring pattern including the antenna element on the circuit board to constitute a three-dimensional loop antenna.

  A third aspect of the present invention is the antenna structure according to the second aspect, wherein the first metal member is provided on the inner surface of the housing 12 as shown in FIGS. 86 and a second metal member 84 provided on the wiring pattern 82 and having elasticity and contacting the first metal member 86.

  According to the third aspect of the present invention, the second metal member provided on the wiring pattern of the circuit board is in elastic contact with the first metal member provided on the inner side surface of the housing.

  A fourth aspect of the present invention is the antenna structure according to the first aspect, wherein the metal member 96 is installed on the circuit board 61 as shown in FIG. 7, for example. .

  According to the invention described in claim 4, the three-dimensional loop antenna is constituted by the antenna element, the wiring pattern, and the metal member on the circuit board.

  According to the present invention, there is a three-dimensional loop antenna including a wiring pattern and an antenna element on a circuit board, and a metal member connected to both ends of the wiring pattern. Since the length can be increased, antenna characteristics such as gain and bandwidth can be greatly improved as compared with the antenna alone.

Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings.
As shown in FIG. 1, the cellular phone to which the present invention is applied is a foldable type in which a main body 1 and a lid 2 are coupled by a hinge 3, and the main body 1 is provided with an operation unit 4. The display unit 5 is provided.

  As shown in FIG. 2, the main body unit 1 includes a unit assembly 6 that is a circuit unit, a key button unit 41, a microphone 71, a vibrator 72, Various parts such as a macro knob 73, a macro knob holder 74, and a light lens holder 75 are incorporated. A battery cover 13, an interface cap 14, an earphone cap 15, and an SD card slot cap 16 are attached to the lower case 11.

The unit assembly 6 is a circuit board 61 assembled with various electronic components such as a key board 62. A chip antenna 81, which is a dielectric antenna, is mounted as an antenna element on one end of the circuit board 61 in the longitudinal direction.
That is, the chip antenna 81 is installed in the approximate center of the one end part of the circuit board 61, as expanded and shown in FIG. As shown in FIG. 4, the chip antenna 81 is installed inside without being exposed on the front and back surfaces of the circuit board 61, that is, connected to the wiring patterns 82 and 83 on both sides formed in the inner layer. The wiring patterns 82 and 83 installed inside the circuit board 61 extend to both sides along the end of the circuit board 61.

  In the illustrated example, one wiring pattern 82 has a substantially U shape, and a metal spring 84 (see FIG. 6) as a metal member installed on the circuit board 61 is connected to the tip of the wiring pattern 82, and the other wiring pattern 83. Has a curved shape, and a connection terminal 85 made of a metal foil installed on the circuit board 61 is connected to the tip thereof.

Further, as shown in FIG. 5, a metal plate 86 as a metal member is provided at one end of the upper case 12 in the longitudinal direction.
That is, the metal plate 86 is attached to the inner side surface of the upper case 12 by bonding or the like along one end portion. In the drawing, substantially L-shaped bent portions 87 and 88 are respectively provided at both end portions of the curved metal plate 68. Is formed. Here, as shown in FIG. 6, one bent portion 87 corresponds to the connection terminal 85 of the circuit board 61, and the other bent portion 88 corresponds to the metal spring 84 of the circuit board 61.

Then, in the assembled state of the main body portion 1 in which the unit assembly 6 is incorporated and the lower case 11 and the upper case 12 are combined, as shown in FIG. 6, one of the metal plates 86 provided on the upper case 12 is bent. The part 87 is connected to the connection terminal 85 of the circuit board 61, and the other bent part 88 is connected to the metal spring 84 of the circuit board 61.
Therefore, an antenna loop circuit is configured by the chip antenna 81 on the circuit board 61 side, the wiring patterns 82 and 83, the metal springs 84 and the connection terminals 85, and the metal plate 86 on the upper case 12 side, that is, the three-dimensional loop antenna 8. Is configured.

As described above, since the three-dimensional loop antenna 8 is provided in one end portion of the main body 1 in the cellular phone, the wiring patterns 82 and 83, the metal spring 84, and the metal plate 86 can be obtained together with the wavelength shortening effect by the dielectric antenna (chip antenna 81). The effective antenna length can be increased by
In addition, in the embodiment, by providing the wiring patterns 82 and 83 and the metal springs 84 in the portion where the other electronic components are not mounted at one end of the circuit board 61, and by providing the metal plate 86 in the corresponding portion of the upper case 12, The antenna effective length can be increased while effectively utilizing the vacant dead space while reducing the size and weight, and thus the antenna characteristics such as gain and bandwidth can be greatly improved as compared with the antenna alone.

FIG. 7 shows the second embodiment. One end of a circuit board 61 is provided with a chip antenna 91 on one side, and a metal plate 96 on the other side is installed. Wiring patterns 92 and 93 connected to 96 are formed.
That is, the metal plate 96 has substantially L-shaped bent portions 97 at both ends, and is mounted on the circuit board 61 by the bent portions 97. The bent portions 97 at both ends and both ends of the chip antenna 91 are mounted. Are connected by wiring patterns 92 and 93 formed on opposite sides of the circuit board 61, respectively.

Thus, on the circuit board 61, the three-dimensional loop antenna 9 including the chip antenna 91, the wiring patterns 92 and 94, and the metal plate 96 is configured.
This three-dimensional loop antenna 9 can also provide the same effects as the three-dimensional loop antenna 8 described above.

In the above embodiment, the antenna structure of the cellular phone is used. However, the present invention is not limited to this, and may be applied to other portable radio devices such as a PDA.
Also, the wiring pattern, the shape of the metal member, and the like are arbitrary, and it is needless to say that other specific detailed structures can be appropriately changed.

BRIEF DESCRIPTION OF THE DRAWINGS The structure of one Embodiment to which this invention is applied is shown, and it is the front view (a), side view (b), and back view (c) which showed an example of the portable radio | wireless machine. It is the disassembled perspective view which showed the components structure of the portable radio | wireless machine. It is the enlarged plan view which showed the antenna element and wiring pattern part which were provided in the circuit board. It is the figure which showed the wiring pattern part of the circuit board of FIG. It is the enlarged plan view which showed the metal member part provided in the housing | casing. It is the enlarged front view which showed the three-dimensional loop antenna part. FIG. 7 is an enlarged perspective view showing an antenna element, a metal member, and a wiring pattern portion provided on a circuit board according to a second embodiment to which the present invention is applied.

Explanation of symbols

11.12 Case 61 Circuit board 8 Three-dimensional loop antenna 81 Antenna element 82/83 Wiring pattern 84 Metal member (metal spring)
85 Connection terminal 86 Metal member (metal plate)
87/88 bent portion 9 three-dimensional loop antenna 91 antenna element 92/93 wiring pattern 96 metal member (metal plate)
97 Bending part

Claims (4)

A circuit board having a wiring pattern;
An antenna element installed on the wiring pattern on the circuit board;
An antenna structure, wherein a loop circuit is formed by a metal member having both ends connected to the wiring pattern.   The antenna structure according to claim 1, wherein the metal member is provided in a housing that houses the circuit board. A first metal member provided on an inner surface of the housing;
The antenna structure according to claim 2, further comprising: a second metal member provided on the wiring pattern and having elasticity and contacting the first metal member.   The antenna structure according to claim 1, wherein the metal member is installed on the circuit board.

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