JP2008118359A - Walkie-talkie - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a walkie-talkie which exhibits favorable antenna characteristics over a wide band. <P>SOLUTION: The walkie-talkie comprises a first housing equipped with a first substrate connected with a feed element, a second housing equipped with a second substrate connected with a parasitic element, a hinge for connecting the first housing and the second housing in such a manner that they can turn with respect to each other, and a substrate connecting portion for electrically connecting the first substrate and the second substrate. The feed element and the parasitic element are arranged in such a manner that their arrangement positions on the respective first and second substrates may be on a diagonal line. Moreover, the feed element and the parasitic element are so arranged as to be capacitively coupled with each other. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a portable wireless device that exhibits good antenna characteristics over a wide band.

  In recent portable wireless devices, the size of terminals (portable wireless devices) has been reduced in accordance with the needs of users, and the functions to be used have also been advanced. By mounting a high-functional device for adding various functions despite the miniaturization of the terminal, the mounting volume of the high-functional device in the portable wireless device has increased.

  In addition to the miniaturization of terminals, from the viewpoint of the external appearance design of terminals, in terminals such as mobile phones, antennas are being built in which an antenna is arranged in a housing. As described above, with increased functionality of the terminal, the mounting volume in the housing is forced to increase against the downsizing of the terminal, such as a camera and a removable memory, and the free space in the terminal is limited . Actually, a sufficient space for housing the antenna cannot be secured, and it has become difficult to obtain good antenna characteristics.

  As conventional techniques related to an antenna of a portable wireless device that improves such problems, there are techniques disclosed in Patent Documents 1 and 2. In the invention disclosed in Patent Document 1, in a terminal configured in a foldable form having an upper circuit board and a lower circuit board, the upper circuit board and the lower circuit board are connected by a coaxial cable, and the upper and lower circuit boards are connected to each other. Excited and operated as a dipole antenna. The invention disclosed in Patent Document 1 reduces the space required for the built-in antenna and realizes good antenna characteristics.

In the invention disclosed in Patent Document 2, in a terminal configured in a form having an upper substrate and a lower substrate, a power feeding element connected to the lower substrate and a GND on the upper substrate so as to face the power feeding element are not fed The elements are connected. The invention disclosed in Patent Document 2 capacitively couples the feeding element and the parasitic element so that the upper substrate itself can operate as an antenna, and realizes good antenna characteristics.
JP 2004-172919 A JP 2006-041899 A

  However, in the invention disclosed in Patent Document 1, it is necessary to pass a coaxial cable for connecting the upper and lower circuit boards through the hinge portion, and there is a concern that the hinge portion structure has restrictions and lacks flexibility in design. The invention disclosed in Patent Document 2 exhibits good antenna characteristics by adding a parasitic element, but it is difficult to improve impedance characteristics over a wide band.

  In view of such a problem, the present invention provides a portable wireless device in which a feeding element and a parasitic element connected to a first board and a second board are arranged on a diagonal line, and are arranged at positions where they are capacitively coupled. It is intended to provide.

  To achieve the above object, the invention described in claim 1 includes a first housing including a first substrate to which a feeding element is connected and a second substrate to which a parasitic element is connected. 2 housings, a hinge portion that couples the first housing and the second housing to each other in a freely rotatable manner, and a board connecting portion that electrically connects the first board and the second board. The feeding element and the parasitic element are arranged on the diagonal lines when viewed from the arrangement positions arranged on the first substrate and the second substrate, and are arranged so that the feeding element and the parasitic element are capacitively coupled. It is a portable wireless device.

  According to a second aspect of the present invention, in the portable wireless device according to the first aspect, the feeding element and the parasitic element are arranged at positions that do not contact the board connecting portion.

  According to a third aspect of the present invention, in the portable wireless device according to the first or second aspect, the feeding element and the parasitic element are configured in an L shape or an inverted L shape.

  According to a fourth aspect of the present invention, in the portable wireless device according to the first or second aspect, the feeding element and the parasitic element are configured in a stripline shape.

  According to a fifth aspect of the present invention, in the portable wireless device according to the first or second aspect, the feeding element and the parasitic element are formed in a spiral shape.

  According to a sixth aspect of the present invention, in the portable wireless device according to the first or second aspect, when the portable wireless device is in an open state, the feeding element and the parasitic element are the first casing and the second casing. It arrange | positions in the position which does not contact in the thickness direction, It is characterized by the above-mentioned.

  According to a seventh aspect of the present invention, in the portable wireless device according to any one of the first to sixth aspects, the spacing between the feeding element and the parasitic element when they are closest to each other is within 3 mm. It is characterized by becoming.

  According to the present invention, the feeding element and the parasitic element connected to the first substrate and the second substrate are arranged on the diagonal line, and are arranged at positions where the respective elements are capacitively coupled to each other. A portable wireless device having characteristics can be provided.

  Hereinafter, the portable wireless device of this embodiment will be described with reference to the drawings. The present embodiment is not limited to the one described below, and various modifications can be made without departing from the spirit of the present embodiment. In the present embodiment, a mobile phone will be described as an example of a portable wireless device.

FIG. 1 is a diagram schematically showing a configuration of a mobile phone according to the present embodiment.
The mobile phone according to the present embodiment includes an upper circuit board 1, an upper housing 2, a lower circuit board 3, a lower housing 4, a hinge portion 5, an upper and lower circuit board joint portion 6, and a parasitic element 7. And a feeding element 8. In the present embodiment, a display unit such as a display, a speaker, a camera, and the like are provided on the upper housing 2 side, and an operation unit, a microphone, an external interface, and the like are provided on the lower housing 4 side. Note that each functional unit included in a general mobile phone, such as a display unit, an operation unit, a microphone, a speaker, and a camera, is not a characteristic part of the present invention, and thus description thereof is omitted here.

  An upper circuit board 1 is provided on the upper housing 2 side, and also functions as a control board for controlling, for example, the above-described display unit, speaker, camera, and the like. A parasitic element 7 is connected to the ground line of the upper circuit board 1. In this parasitic element 7, the end (other end) opposite to the side connected to the earth line is an open end.

  A lower circuit board 3 is provided on the lower housing 4 side, and also functions as a control board for controlling, for example, the operation unit, the microphone, and the external interface described above. The lower circuit board 3 is provided with a power feeding element (antenna element) 8 connected to a signal wiring pattern or the like on the lower circuit board 3. Similarly to the parasitic element 7, the feeding element 8 has an open end at the other end opposite to the connection end of the lower circuit board 3.

  The upper housing 2 and the lower housing 4 are molded by plastic or the like, and the hinge portion 5 that joins the upper housing 2 and the lower housing 4 formed in this manner in a foldable manner. It has. And the upper circuit board 1 and the lower circuit board 3 are connected by the upper and lower circuit board junction part 6 comprised with flexible substrates, such as a flexible wire. For example, an operation signal from the lower circuit board 3 is sent to the upper circuit board 1 through the upper and lower circuit board joints 6 by an operation by the operation unit and displayed on the display unit.

  The feed element 8 and the parasitic element 7 are arranged on a diagonal line as illustrated in FIGS. In the present embodiment, the mobile phone is disposed at a position (see FIG. 2) so as not to contact the upper and lower circuit board joint 6 when the mobile phone is in an open state (when not folded). This is because the feeding element 8 and the parasitic element 7 come into contact with the upper and lower circuit board joints 6 to affect the frequency band and it becomes difficult to obtain good antenna characteristics. .

  FIG. 3 shows a case where the feeding element is fixedly arranged and the parasitic element is arranged at a position facing the feeding element (a), and a case where the parasitic element is arranged on a diagonal line with the feeding element (b). The experimental result which shows the relationship between a frequency band and a return loss is illustrated by graphing.

  Including Patent Document 2 described above and the like, when the arrangement position of the parasitic element with respect to the feeding element is arranged at the opposite position, the frequency band is narrowed as indicated by the symbol a in FIG. On the other hand, when the parasitic element is disposed on the diagonal line, the frequency band is widened as indicated by reference sign b in FIG.

  In this way, by arranging the feeding element 8 and the parasitic element 7 on a diagonal line, an electrostatic capacitance is formed between the feeding element 8 and the parasitic element 7 and capacitively coupled, and the upper circuit board 1 and The lower circuit board 3 is excited. As a result, the upper circuit board 1 and the lower circuit board 3 can be operated as a dipole antenna without using a coaxial line, and a portable radio device having good antenna characteristics over a wide band can be provided.

  In FIG. 1 and FIG. 2, the power supply element 8 is connected to the lower circuit board 3 and the parasitic element 7 is connected to the upper circuit board 1. However, the configuration of the present embodiment is not limited to this. For example, the feed element 8 may be connected to the upper circuit board 1 and the parasitic element 7 may be connected to the lower circuit board 3. Further, the power supply element 8 is arranged on the left side and the parasitic element 7 is arranged on the right side when viewed from the longitudinal direction of the mobile phone, but the power supply element 8 may be on the right side and the parasitic element 7 may be arranged on the left side. . In the present embodiment, if the arrangement of the feeding element 8 and the parasitic element 7 is on a diagonal line, the arrangement position can be freely configured up and down, left and right.

  The distance L between the feeding element 8 and the parasitic element 7 is preferably within 3 mm as shown in FIG. If the distance L is larger than 3 mm, for example 4 mm, capacitive coupling becomes difficult and the frequency band becomes narrow.

The shapes of the feed element 8 and the parasitic element 7 are not limited to the L-shape and the inverted L-shape shown in FIGS. 1 and 2, but various shapes such as an F-shape, a meander shape, and a helical shape. Applicable.
Other examples of the shapes of the feeding element 8 and the parasitic element 7 of the present embodiment are shown in FIGS.

  Various shapes such as a stripline shape as shown in FIG. 4 and a coil (spiral) shape as shown in FIG. 5 can be applied as the shapes of the feeding element 8 and the parasitic element 7. Moreover, as shown in FIG.6 (b), it can also be set as the structure arrange | positioned so that it may shift | deviate in the thickness direction of the upper housing | casing 2 and the lower housing | casing 4 of a mobile telephone.

  When viewed from the back of the mobile phone as shown in FIG. 6A, the feeding element 8 and the parasitic element 7 appear to overlap, but when viewed from the side of the cellular phone, the feeding element 8 and the parasitic element 7 is configured not to overlap. In this case, the distance L between the feeding element 8 and the parasitic element 7 is applied in the thickness direction as shown in FIG.

  In FIG. 6, the feeding element 8 is described as being on the upper side in the thickness direction and the parasitic element 7 is positioned on the lower side in the thickness direction. However, this arrangement relationship may be reversed, and the feeding element 8 is positioned on the lower side. Needless to say, the configuration may be such that 7 is on the upper side.

  In addition, by combining the shape shifted in the thickness direction with the L-shape, F-shape, inverted L-shape, stripline shape, coil shape, etc., a wider variety of feed elements and parasitic It can also be an element. Whatever shape of antenna is used, the above-described effects specific to the present invention can be expected.

  Further, it is assumed that a metal sheet metal is used as the power supply element 8 and the parasitic element 7. However, in this embodiment, it is not limited to a sheet metal, For example, a metal copper wire, a metal wire (coil), a metal film etc. are also applicable. Further, for example, a metal piece with a resin support such as a molded product, a printed board, or a chip element can be used instead.

  Furthermore, the length, thickness, shape, and the like of the feed element 8 and the parasitic element 7 are appropriately changed according to the frequency and impedance matching conditions desired for the portable wireless device to which the present embodiment is applied. Good.

  As described above, according to the portable wireless device of the present embodiment, the parasitic element 7 connected to the ground line of the upper circuit board 1 and the feeder element 8 connected to the lower circuit board 3 are arranged diagonally. Thus, since the upper and lower circuit boards easily operate as an antenna, the structural restrictions of the portable wireless device can be reduced. In addition, as shown in the graph of FIG. 3 described above, it is possible to obtain good antenna characteristics over a wide band.

It is an external view which shows an example of the portable wireless apparatus of this embodiment. It is a figure which shows an example of the electric power feeding element 8 and the parasitic element 7 of this embodiment, (a) shows the case where it sees from the back surface, (b) shows the case where it sees from the side surface. It is a graph which shows a frequency band typically. It is a figure which shows the case where a stripline shape is used for the feed element 8 and the parasitic element 7. It is a figure which shows the case where a coil shape is used for the feed element 8 and the parasitic element. It is a figure which shows the other example of arrangement | positioning of the feed element 8 and the parasitic element 7 of this embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Upper circuit board 2 Upper housing | casing 3 Lower circuit board 4 Lower housing | casing 5 Hinge part 6 Upper-lower circuit board junction part 7 Parasitic element 8 Feeding element

Claims (7)

A first housing including a first substrate to which a feeding element is connected;
A second housing including a second substrate to which a parasitic element is connected;
A hinge portion that rotatably couples the first housing and the second housing;
A board connecting portion for electrically connecting the first board and the second board;
The feeding element and the parasitic element are arranged on diagonal lines when viewed from the arrangement positions arranged on the first substrate and the second substrate, and the feeding element and the parasitic element are capacitively coupled. A portable radio characterized by being arranged.   The portable wireless device according to claim 1, wherein the power feeding element and the parasitic element are arranged at positions that do not contact the board connecting portion.   The portable wireless device according to claim 1, wherein the feeding element and the parasitic element are configured in an L shape or an inverted L shape.   The portable wireless device according to claim 1, wherein the feeding element and the parasitic element are configured in a stripline shape.   The portable wireless device according to claim 1 or 2, wherein the feeding element and the parasitic element are formed in a spiral shape. When the portable radio is open,
The portable wireless device according to claim 1 or 2, wherein the feeding element and the parasitic element are arranged at positions that do not contact in the thickness direction of the first casing and the second casing. Machine.   The portable wireless device according to any one of claims 1 to 6, wherein the feeding element and the parasitic element are arranged within an interval of 3 mm when they are closest to each other.

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