JP2006166260A - Foldable portable radio - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure good antenna performance even in a foldable portable radio device having a plurality of antennas having no hinge mechanism.
A connection condition of a holding member 104 that can be bent and can hold an open state for connecting a first housing 102 and a second housing 103 is defined as reactance elements 111, 112, 113, The impedance is controlled by switching 114. Thereby, good antenna performance is realized by making the ground length seen from the antenna selected from the first antenna 120 or the second antenna 121 close to the antenna resonance frequency.
[Selection] Figure 1

Description

  The present invention relates to a foldable portable wireless device having an antenna for wireless communication provided with two housings connected to each other so as to be opened and closed.

An electronic apparatus having a structure that realizes holding of opening / closing of a casing by using a planar connecting member that bends instead of a hinge mechanism has been proposed (for example, see Patent Document 1).
In the folding portable wireless device in which the first housing and the second housing are formed to be openable and closable by hinges, the ground length viewed from the antenna is switched to the ground length corresponding to the frequency band to be used. Thus, a method for obtaining good antenna characteristics has been proposed (see, for example, Patent Document 2).

JP-A-5-259656 JP 2003-332938 A

However, in the configuration of an electronic device that uses a bent planar connecting member as described in Patent Document 1 to maintain the opening and closing of the housing, an antenna necessary for application to a portable wireless device is easily provided. There is a problem that the antenna performance cannot be ensured.
Further, in the method of switching to the ground length corresponding to the frequency band using the ground length viewed from the antenna as described in Patent Document 2, good antenna performance is not guaranteed when a plurality of antennas are provided.

  The present invention has been made in view of the above circumstances, and provides a foldable portable radio device capable of obtaining good antenna performance by switching the ground length without having a hinge structure. With the goal.

  In order to achieve the above object, a foldable portable radio of the present invention includes a first casing in which a first circuit board is disposed, and a second casing in which a second circuit board is disposed. A holding member made of a conductive material connected to each of the first circuit board and the second circuit board, and a wireless circuit unit provided on either the first circuit board or the second circuit board A plurality of antennas connected to the radio circuit unit via a feeder line, and the holding member is connected to the first circuit board via a switching circuit provided on each of the first circuit board and the second circuit board. Connected to the first circuit board and the second circuit board, and the switching circuit electrically opens the holding member to the ground of the first circuit board and the ground of the second circuit board, or Impedance by switching between short circuit Characterized in that it is a control possible.

  That is, according to the reception state of the plurality of antennas, the connection of the holding member to the ground of the first circuit board and the ground of the second circuit board is switched to either electrically open or short-circuited. By electrically controlling the impedance, the ground length viewed from the antenna can be brought close to the antenna resonance frequency (integer multiple of λ / 4), and good antenna performance is guaranteed regardless of environmental conditions.

In the present invention, it is preferable that the first casing and the second casing are mechanically connected to each other by the holding member so as to be opened and closed.
As described above, since the first housing and the second housing are mechanically connected to each other by the holding member so as to be openable and closable, the hinge structure can be eliminated, and the cost can be reduced by simplifying the structure. Can do.

Furthermore, it is desirable to provide a reception state detection unit that switches the antenna according to the reception level at the antenna.
That is, higher antenna performance can be realized by selecting an appropriate antenna according to the reception state.

The holding member is preferably connected to the ground of the first circuit board or the second circuit board via a predetermined reactance element.
Thus, the impedance control of the holding member can be easily performed by connecting the holding member to the ground via a predetermined reactance element.

  According to the folding portable wireless device of the present invention, the ground length viewed from the antenna can be brought close to the antenna resonance frequency (integer multiple of λ / 4), and high antenna performance can be realized regardless of environmental conditions.

Hereinafter, an embodiment of a foldable portable wireless device according to an embodiment of the present invention will be described with reference to the drawings.
In the present embodiment, an 800 MHz band foldable portable radio device used in a terrestrial cellular system will be described as an example.
FIG. 1 is a schematic rear view showing a folding portable wireless device for explaining an embodiment of the present invention, and FIG. 2 is an opened view showing a structure of the folding portable wireless device according to the embodiment. It is a front view of a state.

As shown in FIG. 1, the foldable portable wireless device 101 includes a first housing 102 and a second housing 103, and the first housing 102 and the second housing 103. Are connected to each other by a holding member 104 so as to be mechanically openable and closable.
The foldable portable wireless device 101 including the first casing 102 and the second casing 103 is 190 mm in length and 40 mm in width in the opened state.

As shown in FIG. 2, the first housing 102 is provided with a display unit 131 made up of, for example, a liquid crystal LCD display, a receiver, and the like, and the dimensions thereof are set to 70 mm in length and 40 mm in width. The second housing 103 is provided with, for example, an operation unit 132, a wireless circuit, and the like, and the dimensions thereof are set to 70 mm in length and 40 mm in width.
The first casing 102 includes a first circuit board 105 therein, and the second casing 103 includes a second circuit board 106 therein.

The first circuit board 105 and the second circuit board 106 are each composed of, for example, a printed board having a thickness of 1 mm, and the dimensions thereof are set to 65 mm in length and 35 mm in width.
A holding member 104 is connected to the first circuit board 105 and the second circuit board 106.
The holding member 104 is formed of a conductive material, and its dimensions are set to, for example, a length of 60 mm, a width of 20 mm, and a thickness of 0.2 mm.

  The holding member 104 has a first reactance element 111, a second reactance element 111 as a control means for electrically opening or shorting the ground of the first circuit board 105 and the second circuit board 106. The reactance element 112, the third reactance element 113, and the fourth reactance element 114 are connected.

The first reactance element 111, the second reactance element 112, the third reactance element 113, and the fourth reactance element 114 are impedance adjustment elements such as coils and capacitors.
The first ground point 115, the second ground point 116, the third ground point 117, and the fourth ground point 118 are ground points, respectively.

The first reactance element 111 and the second reactance element 112 are connected to the ground of the second circuit board 106 via the first ground point 115 and the second ground point 116, and the third reactance element The element 113 and the fourth reactance element 114 are connected to the ground, which is a circuit pattern having the ground potential of the first circuit board 105, via the third ground point 117 and the fourth ground point 118.
The first grounding point 115, the second grounding point 116, the third grounding point 117, and the fourth grounding point 118 are not limited to the locations shown in FIG. 1, and can be connected to the ground of the circuit board. The connection location is not particularly limited.

  A first switch 109 and a second switch 110 are provided on the first circuit board 105 and the second circuit board 106. The first switch 109 and the second switch 110 are changeover switches that switch the reactance elements 111, 112, 113, and 114 described above in order to electrically control the impedance of the holding member 104.

  In addition, a reception state detection unit 108 is provided in the wireless circuit unit 107 of the second circuit board 106. The reception state detection unit 108 has a control function for switching and selecting the antenna having the higher reception level of the first antenna 120 and the second antenna 121 corresponding to the surrounding received electric field strength.

  The first antenna 120 is constituted by a conducting wire having a diameter of 1 mm, for example, and is disposed between the first circuit board 105 and the second circuit board 106. The first antenna 120 is composed of a conductor having a length of about ¼ wavelength in the 800 MHz band used in the terrestrial cellular system, and is set to have a total length of about 90 mm, for example.

  The second antenna 121 is disposed in the vicinity of the charging terminal 119 disposed at the end of the second housing 103 and, like the first antenna 120, is approximately ¼ in the 800 MHz band used in the terrestrial cellular system. For example, the total length is set to about 90 mm.

  The foldable portable wireless device 101 configured as described above is configured so that the reception state detection unit 108 has one of the first antenna 120 and the second antenna 121 having a high reception level from the surrounding reception electric field strength. Select.

Then, the first reactance element 111, the second reactance element 112, the third reactance element 113, and the fourth reactance element are arranged so that the ground length approaches the antenna resonance frequency (integer multiple of λ / 4) for the selected antenna. The impedance of the holding member 104 connected to the first housing 102 and the second housing 103 is electrically controlled via the reactance element 114.
Thereby, in this portable wireless device 101, good antenna performance can be obtained regardless of the state by switching the ground length by the antenna to be selected.

  As described above, in the foldable wireless device 101 of the present invention, the grounding of the first circuit board 105 and the grounding of the second circuit board 106 are performed according to the reception states of the plurality of antennas 120 and 121. By switching the connection of the holding member 104 to either electrically open or shorted to electrically control the impedance, the ground length viewed from the antenna is set to the antenna resonance frequency (integer multiple of λ / 4). And good antenna performance can be ensured regardless of the surrounding received electric field level.

In addition, since the first housing 102 and the second housing 103 are mechanically connected to each other by the holding member 104 so as to be openable and closable, a hinge structure can be eliminated and the cost can be reduced by simplifying the structure. be able to.
Furthermore, higher antenna performance can be realized by selecting one of the first antenna 120 and the second antenna 121 according to the reception state.

In addition, the impedance control of the holding member 104 can be easily performed by connecting the holding member 104 to the ground via the predetermined reactance elements 111, 112, 113, and 114.
In the present embodiment, the case where the present invention is applied to a portable wireless device including a mobile phone as a communication device has been described. However, the present invention is not limited to this, and is a composite including a transmitter, a receiver, and the like. It can also be applied to other types of terminal equipment.

  The folding portable wireless device according to the present invention can obtain good antenna performance regardless of the reception state.

It is a schematic rear view which shows the open state of the foldable portable radio | wireless machine by this invention. It is a front view which shows the open state of the foldable portable radio | wireless machine which concerns on embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 101 Folding portable radio | wireless machine 102 1st housing | casing 103 2nd housing | casing 104 Holding member 105 1st circuit board 106 2nd circuit board 107 Radio | wireless circuit part 108 Reception state detection part 109 1st switch 110 1st Two switches 111 First reactance element 112 Second reactance element 113 Third reactance element 114 Fourth reactance element 120 First antenna 121 Second antenna

Claims (4)

A first housing in which a first circuit board is disposed;
A second housing in which a second circuit board is disposed;
A holding member made of a conductive material connected to each of the first circuit board and the second circuit board;
A wireless circuit unit provided on either the first circuit board or the second circuit board;
A plurality of antennas connected to the radio circuit unit via a feeder line,
The holding member is connected to the first circuit board and the second circuit board via switching circuits provided on the first circuit board and the second circuit board, respectively.
The switching circuit is capable of impedance control by switching whether the holding member is electrically opened or short-circuited with respect to the ground of the first circuit board and the ground of the second circuit board. A foldable portable radio.   The foldable portable wireless device according to claim 1, wherein the first casing and the second casing are mechanically connected to each other by the holding member so as to be opened and closed.   The foldable portable wireless device according to claim 1 or 2, further comprising a reception state detection unit that switches the antenna according to a reception level at the antenna.   The folding member according to any one of claims 1 to 3, wherein the holding member is connected to a ground of the first circuit board or the second circuit board via a predetermined reactance element. Tatami portable radio.

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