JP2007318236A - Portable radio device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a portable radio device capable of ensuring stable antenna characteristics, irrespective of a change in status of opening/closing of a case. <P>SOLUTION: The device has: a lower case 1 and an upper case 2; a hinge portion 3 for coupling the lower case 1 to the upper case 2 openably and closably; hinge fixing portions 3A and 3B for constituting the hinge portion 3; a hinge movable portion 3C provided inside the hinge portion 3; antennas 31, 34 provided on the hinge portion 3; and a protrusion 33A configuring a means capable of changing an antenna length by the opening/closing of the cases. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a portable radio having a function for enhancing the performance of an antenna.

  In recent years, portable wireless devices such as mobile phones have become widespread, and users demand small, lightweight, and well-designed products. Considering these user-friendliness and design, portable radios that adopt a foldable shape (hereinafter referred to as foldable portable radio) are the mainstream. However, with the spread of this foldable portable wireless device, the following adverse effects have occurred. That is, the antenna element vicinity condition and the antenna GND condition change depending on the open / close state of the housing, and the antenna characteristics may not be stably obtained. Therefore, in the folding portable wireless device, it is an important issue to stabilize the antenna performance regardless of whether the housing is opened or closed.

By the way, various types of conventional antennas are known, and an example thereof will be described with reference to FIG. 10 (see, for example, Patent Document 1).
That is, as shown in the figure, there are a lower casing 101 having a transmitter (not shown) and an upper casing 102 having a receiver (not shown), and a hinge for rotatably connecting these casings 101, 102. In the foldable mobile phone having the portion 103, the antenna 104 housed on the lower housing 101 side can be automatically arranged at a position away from the user's head in conjunction with the operation of opening the upper housing 102. It is configured as follows. In the figure, reference numeral 120 denotes a substrate.

Specifically, an eccentric cam 106 that is integrally attached to the rotation shaft 103A of the hinge portion 103 and rotates in conjunction with opening and closing of the housing, a storage arm 107 that retractably stores the antenna 103, In order to pivotally support the storage arm 107, the fulcrum pin 108 rotatably attached to the lower casing 101 and the rotational movement of the cam 106 interlocked with the opening operation of the upper casing 102 are received. And an extrusion member 110 that shifts in a direction to push out the upper portion of the storage arm 107 against an elastic force.
JP 2004-328346 A

  However, in the configuration described above, the influence of, for example, the distance between the antenna 104 and the lower casing 101, the GND condition of the substrate 120, and the proximity metal parts differ depending on the open / close state of the housing. Furthermore, even when the upper casing 102 is opened, the distance between the antenna 103 and the lower casing 101, the GND condition of the substrate 120, and the proximity are similarly determined between the state in which the antenna 103 is pulled out and the retracted state. Since the influences of metal parts and the like are different, there is a possibility that the antenna characteristics change during use, and stable characteristics cannot be obtained.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a portable wireless device capable of ensuring stable antenna characteristics regardless of changes in the state of opening and closing of the housing.

The portable wireless device of the present invention includes a first housing, a second housing, a hinge portion that connects the first housing and the second housing so as to be openable and closable, and an antenna provided in the hinge portion. And means capable of changing the antenna length by opening and closing the casing.
With this configuration, the antenna length can be adjusted by opening / closing the housing, the resonance frequency of the antenna can be adjusted, and stable antenna characteristics can be ensured regardless of the state change of the housing opening / closing.

In the portable wireless device of the present invention, the antenna includes a hinge fixing portion and a hinge movable portion which are metal bodies constituting the antenna inside the hinge portion.
With this configuration, it is not necessary to prepare an antenna element separately, and the cost and mounting volume can be reduced.

In the portable wireless device of the present invention, the means capable of changing the antenna length is selectively connected to the extension element provided in the hinge fixing portion, and the extension element and the hinge movable portion in conjunction with the opening / closing operation of the casing. It is comprised with the protrusion provided in the said hinge movable part connected to.
With this configuration, it is possible to adjust the resonance frequency by changing the length of the metal body in which the antenna is operated by opening and closing the housing, and to ensure stable antenna characteristics regardless of the state change of the housing opening and closing.

In the portable wireless device of the present invention, the extension element of the hinge fixing portion is configured as a single element, and the extension element and the metal body are connected only when the casing is opened or only when the casing is closed. To do.
With this configuration, when the resonance frequency when opened is higher than when the case is closed, the resonance frequency when opened can be shifted to a lower side, and stable antenna characteristics can be achieved regardless of whether the case is opened or closed. It can be secured. In addition, with this configuration, if the resonance frequency when closed is higher than when the case is opened, the resonance frequency when closed can be shifted to a lower side, and a stable antenna can be used regardless of whether the case is opened or closed. Characteristics can be secured.

In the portable wireless device of the present invention, the extension element of the hinge fixing portion is composed of two elements, a first extension element and a second extension element, and the first extension element includes the metal body and a housing. Is connected when the metal element is opened, and the second extension element is connected when the metal body and the casing are closed.
With this configuration, even when the metal body constituting the hinge portion is short, the length of the metal body that is operating the antenna by opening and closing the housing can be changed by both opening and closing the housing, the resonance frequency can be adjusted, and stable antenna characteristics can be ensured.

In the portable wireless device of the present invention, a resonance circuit is provided between the first extension element, the second extension element, and the metal body.
With this configuration, the antenna can be used in a plurality of frequency bands.

In the portable wireless device of the present invention, the antenna is configured by an antenna element provided in a hinge fixing portion which is a metal body inside the hinge.
With this configuration, the antenna can be configured even when there is no metal body constituting the hinge portion.

In the portable wireless device according to the present invention, the means capable of changing the antenna length includes an extension element provided in the hinge movable part, and the extension element and the antenna element of the hinge fixing part interlocked with the opening / closing operation of the casing. And a protrusion provided on the antenna element to be selectively connected.
With this configuration, the antenna length can be changed by opening and closing the housing, the resonance frequency can be adjusted, and stable antenna characteristics can be ensured regardless of the state change of the housing opening and closing.

In the portable wireless device according to the present invention, the extension element provided in the hinge movable part is configured as a single element, and the extension element and the extension element are provided only when the casing is opened or only when the casing is closed. The antenna element is connected.
With this configuration, when the resonance frequency when opened is higher than when the case is closed, the resonance frequency when opened can be shifted to a lower side, and stable antenna characteristics can be achieved regardless of whether the case is opened or closed. It can be secured. Or, with this configuration, when the resonance frequency when closed is higher than when the case is opened, the resonance frequency when closed can be shifted to the lower side, and a stable antenna regardless of whether the case is opened or closed. Characteristics can be secured.

In the portable wireless device of the present invention, the extension element provided on the hinge movable part is composed of two of a third extension element and a fourth extension element, and the third extension element and the antenna element are The fourth extension element and the antenna element are connected when the casing is closed, and are connected when the casing is closed.
With this configuration, even when it is difficult to secure the antenna element length, the antenna element length can be changed by both opening and closing the housing by opening and closing the housing, the resonance frequency can be adjusted, and stable antenna characteristics can be secured.

In the portable wireless device of the present invention, a resonance circuit is provided between the third extension element, the fourth extension element, and the antenna element.
With this configuration, the antenna can be used in a plurality of frequency bands.

  According to the present invention, the portable radio capable of stabilizing the antenna characteristics regardless of the state change due to the opening / closing of the housing by means of changing the antenna length by opening / closing the housing using the antenna provided in the hinge portion. Can provide a machine.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
(First embodiment)
First, a folding portable wireless device according to a first embodiment of the present invention will be described. 1A and 1B are front views of the folding portable wireless device according to the present embodiment, in which FIG. 1A is a front view showing a state where the housing is opened, and FIG. 1B is a front view showing a state where the housing is closed.
The foldable portable wireless device of this embodiment includes a lower casing 1 that is a first casing, an upper casing 2 that is a second casing, and a hinge portion 3 that rotatably connects these casings. . Further, the hinge part 3 is composed of hinge fixing parts 3A and 3B and a hinge movable part 3C, and the upper casing 2 and the lower casing 1 are opened and closed by the rotation of the hinge movable part 3C.

  The hinge fixing part 3A and the hinge movable part 3C of the hinge part 3 include a metal body 31 formed of a conductive material, for example, magnesium alloy, aluminum or the like. The metal body 31 includes a metal body fixing portion 32 and a metal body movable portion 33. A part of the upper housing 2 and the metal body movable portion 33 provided inside the hinge movable portion 3C are rotated together. The housing 2 and the lower housing 1 can be opened and closed.

  An extension element 34 is disposed in the hinge fixing portion 3B, and the extension element 34 is formed of a conductive material such as copper or aluminum, for example. Further, since the extension element 34 is in an immobile state, when the casing is opened, the extension element 34 is connected to a protrusion 33A provided on the metal body movable portion 33 (see FIG. 1A), and the casing is closed. Is not connected (see FIG. 1B).

  A circuit board 11 is mounted inside the lower housing 1, and a wireless circuit 12 is mounted on the circuit board 11. The radio circuit 12 is connected to the metal body fixing part 32 that constitutes the hinge part 3 through the feeding point 13.

  On the other hand, a circuit board 21 is mounted inside the upper housing 2, and the circuit board 21 is connected to the circuit board 11 via the hinge portion 3. The upper casing 2 is provided with a large liquid crystal display unit 22 on the inner side and a small liquid crystal display unit 23 on the outer side.

Next, the operation of the foldable portable wireless device configured as described above will be described.
When this radio is used, radio waves are radiated by the metal body 31 of the hinge portion 3 that is fed at the feeding point 13 and operates as an antenna. The metal body 31 operates as a monopole antenna when the upper housing 2 is closed.
On the other hand, in a state where the upper housing 2 is opened, the metal body 31 operating as a monopole antenna and a metal component such as GND of the circuit board 21 mounted on the upper housing 2 are coupled to each other. The component operates as a director. When the upper housing 2 is opened, the metal body 31 is connected to the extension element 34 disposed on the hinge fixing portion 3B by the projection 33A provided on the metal body 31 to constitute the hinge portion 3 (metal The body 31) + (extension element 34) operates as a monopole antenna.

  Thus, according to the portable wireless device of the first embodiment of the present invention, when the upper case 2 is opened, the length of the metal body 31 constituting the hinge part 3 operating as a monopole antenna is set. It can be extended for a long time by being connected to the extension element 34. Therefore, the resonance frequency of the antenna can be changed according to the opening / closing of the casing, and high antenna performance can be secured at all times regardless of whether the casing is opened or closed.

Next, FIG. 2 shows a VSWR (Voltage Standing Wave Ratio) characteristic α1 when the casing is open and a VSWR (voltage) when the casing is closed when the extension element 34 is not provided. The standing wave ratio) characteristic β1 is shown.
Without the extension element 34, the electrical length of the antenna changes due to a change in the state of opening / closing of the casing, specifically, a change in the GND length of the circuit board 21 and a change in the position of the metal component mounted inside the casing. The characteristic changes. According to FIG. 2, resonance is obtained at a desired frequency f1 when the casing is closed, and resonance is performed at a frequency f2 higher than the desired frequency f1 when the casing is opened. In the closed state, VSWR = 2 at the desired frequency f1, and in the open state, VSWR = 4 at the desired frequency f1, and in the open state, the reflection loss due to matching loss is large.

  Therefore, in the present embodiment, this resonance frequency shift is eliminated by adding the extension element 34 and adjusting the antenna length. The length of the extension element 34 used here is, for example, that the desired frequency f1 is 2 GHz, the resonance frequency f2 in the open state is 2.2 GHz, and the metal body 31 resonates at a length of (1/4) λ. Is about 3 mm (where λ is the wavelength).

FIG. 3 shows the VSWR characteristic α2 when the casing is open and the VSWR characteristic β2 when the casing is closed when the extension element 34 is added.
When the casing is in an open state, the extension element 34 is connected to the metal body 31 constituting the hinge portion 3 so that the resonance frequency in the state in which the casing is open can be shifted to a lower side. As a result, even when the housing is opened, the VSWR characteristics can be made substantially equal to the closed state.
Further, since the extension element 34 and the metal body 31 are not connected in the closed state, the VSWR characteristic does not change. In other words, by adding the extension element 34, the VSWR in the state where the housing is opened is changed from “4” to “2”, which can be improved by 1.4 dB in terms of reflection loss, and the antenna radiation efficiency is also improved. It can be improved by the amount of reflection loss improvement.

(Second Embodiment)
Next, a folding portable wireless device according to the second embodiment will be described. In the present embodiment, the same parts as those in the first embodiment are denoted by the same reference numerals to avoid redundant description.
4A and 4B are front views of the folding portable wireless device according to the present embodiment, in which FIG. 4A is a front view showing a state where the housing is opened, and FIG. 4B is a front view showing a state where the housing is closed.

As shown in the figure, in this foldable portable wireless device, as in the first embodiment, the extension element 34 is disposed on the hinge fixing portion 3B. A protrusion 33B is provided at a position 180 degrees out of phase with the protrusion 33A of the embodiment.
That is, contrary to the first embodiment, the protrusion 33B is configured to be connected to the extension element 34 when the casing is closed and not connected when the casing is open.

  Therefore, the antenna operation is resonance of only the metal body 31 when the casing is opened, and resonance of (metal body 31) + (extension element 34) when the casing is closed, and a desired frequency band. Ensure the characteristics of. That is, in the second embodiment, the length of the metal body 31 operating as a monopole antenna is elongated by connecting to the extension element 34 when the casing is closed. As a result, the resonance frequency of the antenna can be changed by opening and closing the casing, and high antenna performance can always be ensured regardless of opening and closing of the casing.

(Third embodiment)
Next, a folding portable wireless device according to the third embodiment will be described. Also in this embodiment, the same parts as those in the first embodiment are denoted by the same reference numerals to avoid redundant description.

5A and 5B are front views of the folding portable wireless device according to the present embodiment, in which FIG. 5A is a front view in a state where the housing is opened, and FIG. 5B is a front view in a state where the housing is closed.
In this foldable portable wireless device, as shown in the figure, an extension element 34A and an extension element 34B, which are a long first extension element and a short second extension element, are provided inside the hinge fixing portion 3B. Are arranged in an immobile state. Therefore, when the housing is opened, the metal body movable portion 33 is connected to the extension element 34A having a long electric length via the protrusion 33A provided on the metal body movable portion 33. On the other hand, in a state in which the housing is closed, the metal body movable portion 33 is connected to the extension element 34B having an electrical length shorter than that of the extension element 34A via the protrusion 33A.

  Therefore, as an antenna operation, the resonance of (metal body 31) + (extension element 34A) constituting the hinge portion 3 when the casing is opened, and (metal body 31) + (extension element) when the casing is closed. The characteristics of a desired frequency band are secured by the resonance of 34B). As described above, in the third embodiment, the metal body 31 constituting the hinge part 3 operating as a monopole antenna is connected to either the extension element 34A or 34B in any state of opening and closing of the housing to increase the electrical length. It is stretched. In particular, when the housing is in the open state, the electrical length is the longest because it is connected to the extension element 34A.

In this way, by adjusting the length of the electrical length according to the open / close state of the housing, the resonance frequency of the antenna when the housing is opened / closed can be changed, and high antenna performance can be achieved regardless of whether the housing is open / closed. It can be secured. Further, even when the metal body 31 constituting the hinge portion 3 is extremely short, the antenna resonant frequency can be adjusted by providing the extension elements 34A and 34B, and high antenna characteristics can be secured.
The length relationship between the extension elements 34A and 34B is not limited to that described above, and the same effect can be obtained when 34B is longer than the extension element 34A.

(Fourth embodiment)
Next, a folding portable wireless device according to the fourth embodiment will be described. Also in this embodiment, the same parts as those in the first embodiment are denoted by the same reference numerals to avoid redundant description.

FIG. 6 is a front view of a foldable portable wireless device according to a fourth embodiment of the present invention, where (A) is a state in which the housing is opened, and (B) is a front view in a state in which the housing is closed. It is.
In the foldable portable wireless device according to the present embodiment, as shown in the figure, the antenna element 35 is fixedly arranged inside the hinge fixing portion 3A of the hinge portion 3, and the lower casing is connected via the feeding point 13. The wireless circuit 12 on the circuit board 11 inside the body 1 is connected.

  An extension element 36 is disposed inside the hinge movable part 3C, and the hinge movable part 3C and the extension element 36 are rotated together with the upper casing 2 by the housing opening / closing operation, and the positions thereof are changed. Therefore, in a state where the upper housing 2 is opened, the antenna element 35 and the extension element 36 are connected via the protrusion 35 </ b> A provided on the antenna element 35. On the other hand, when the housing is closed, the antenna element 35 and the extension element 36 are not connected. As described above, in the antenna operation, the resonance of only the antenna element 35 is achieved when the casing is closed, and the resonance of (antenna element 35) + (extension element 36) is performed when the casing is opened. Ensure characteristics.

  In the fourth embodiment, the length of the antenna element 23 is increased by connecting to the extension element when the casing is opened, so that the resonance frequency of the antenna can be changed by opening and closing the casing. In either case, high antenna performance can be ensured. In addition, the antenna can be configured without the metal body constituting the hinge portion 3.

(Fifth embodiment)
Next, a folding portable wireless device according to a fifth embodiment of the present invention will be described. Also in the present embodiment, the same parts as those in the first and fourth embodiments are denoted by the same reference numerals to avoid redundant description.

7A and 7B are front views of the folding portable wireless device according to the fifth embodiment, in which FIG. 7A is a front view showing a state in which the housing is opened, and FIG. 7B is a front view showing a state in which the housing is closed.
In the foldable portable wireless device of the present embodiment, the extension element 37 is arranged on the hinge movable portion 3C as in the fourth embodiment. However, unlike the extension element 36 of the fourth embodiment, 180 is provided. It is arranged at a position where the phase is shifted.

  That is, also in the present embodiment, the hinge movable portion 3C and the extension element 37 rotate together by the casing opening / closing operation, but unlike the fourth embodiment, the hinge movable section 3C and the extension element 37 are provided on the antenna element 35 when the casing is closed. The antenna element 35 and the extension element 37 are connected via the protrusion 35A, but the antenna element 35 and the extension element 37 are not connected when the housing is opened.

  As described above, in this embodiment, the antenna operation is resonance of only the antenna element 35 when the casing is opened, and resonance of (antenna element 35) + (extension element 37) when the casing is closed. Ensure the characteristics of the desired frequency band. Therefore, in this embodiment, the antenna element length 35 is increased by connecting to the extension element when the casing is closed, so that the resonance frequency of the antenna can be changed by opening and closing the casing. Regardless of the case, high antenna performance can be secured. Further, the antenna can be configured without a metal body constituting the hinge portion 3.

(Sixth embodiment)
Next, a folding portable wireless device according to a sixth embodiment will be described. Also in this embodiment, the same parts as those in the first, fourth, and fifth embodiments are denoted by the same reference numerals to avoid redundant description.

FIG. 8 is a front view of a folding portable wireless device according to a sixth embodiment of the present invention, in which (A) is a state in which the housing is opened, and (B) is a front view in a state in which the housing is closed. It is.
In the foldable portable wireless device of the present embodiment, the hinge movable portion 3C has two extension elements, that is, the extension element 38A (which constitutes the third extension element) and the extension element (which constitutes the fourth extension element). 38B is arranged. The extension elements 38A and 38B are rotated together with the hinge movable portion 3C by the casing opening / closing operation, so that when the casing is opened, the antenna element 35 is elongated through the protrusion 35A provided on the antenna element 35. Connected to the extension element 38A. On the other hand, when the housing is closed, the antenna element 35 is connected to the short extension element 38B via the protrusion 35A.

Therefore, as an antenna operation, in the state where the casing is opened, resonance at the maximum extended electrical length is caused by (antenna element 35) + (extension element 38A), and in the state where the casing is closed, compared to the opened state. Is a resonance caused by a short but extended (antenna element 35) + (extension element 38B), and ensures characteristics in a desired frequency band. As a result, in the present embodiment, the antenna element 35 can be switched and connected to one of the extension elements 38A and 38B in conjunction with the casing opening / closing operation to adjust the length of the electrical length. Thus, the resonance frequency of the antenna can be changed for any case of opening and closing the case, and high antenna performance can be ensured regardless of whether the case is open or closed. Even when the hinge fixing portion 3A is short and it is difficult to ensure the electrical length of the antenna element, high antenna characteristics can be ensured by providing the extension elements 38A and 38B as in this embodiment.
The length relationship between the extension elements 38A and 38B is not limited to that described above, and the same effect can be obtained when 38B is longer than the extension element 38A.

(Seventh embodiment)
Next, a folding portable wireless device according to a seventh embodiment will be described.
FIG. 9 is a configuration diagram of the extension elements 34A and 34B or 38A and 38B added to the foldable portable wireless device of the present embodiment. In the present embodiment, the configuration other than the extension elements 34A and 34B or 38A and 38B is the same as that of the third and sixth embodiments, and thus the description thereof is omitted.

  In the foldable portable wireless device of this embodiment, the trap circuit 30 is mounted on the extension elements 34A and 34B or 38A and 38B arranged in the hinge portion 3. This trap circuit 30 is for increasing the impedance at a specific frequency and bringing it into an unconnected state, and is constituted by a resonance circuit in which a coil L and a capacitor C are combined.

  Therefore, for example, when the configuration of the third embodiment shown in FIG. 5 is adopted, the antenna operation is performed when the housing is opened (metal body 31) + (the trap circuit 30 of the extension element 34A). ) To obtain the first resonance, and (metal body 31) + (the entire extension element 34A) obtains the second resonance. On the other hand, in the state where the casing is closed, the first resonance occurs until (metal body 31) + (trap circuit 30 of extension element 34B), and the second resonance occurs at (metal body 31) + (entire extension element 34B). Thus, characteristics in a desired plurality of frequency bands are ensured.

Further, when the configuration of the sixth embodiment shown in FIG. 8 is adopted, the first resonance is performed up to (antenna element 35) + (trap circuit 30 of extension element 38A) when the housing is opened as the antenna operation. , (Antenna element 35) + (the entire extension element 38A) obtains the second resonance. On the other hand, when the casing is closed, the first resonance is generated up to (antenna element 35) + (trap circuit 30 of extension element 38B), and the second resonance is generated at (antenna element 35) + (entire extension element 38B). Thus, characteristics in a desired plurality of frequency bands are ensured.
Therefore, also in the seventh embodiment, high antenna performance can be ensured regardless of opening and closing of the casing, and the antenna can be used in a plurality of frequency bands.

The present invention is not limited to the above-described embodiment, and can be implemented in various forms without departing from the scope of the invention.
That is, the arrangement positions of the extension elements 34, 34A, 34B, 36, 37, 38A, 38B are not limited to the positions shown in FIGS. 1, 4, 5, 6, 7, and 8, but the metal body 31 or the antenna element. As long as the connection / disconnection state between 35 and any of the above-described extension elements can be switched, the same effect can be obtained regardless of the position.
In the above embodiment, the antenna feeding point 13 and the wireless circuit 12 are described as being arranged on the circuit board 11 of the lower casing 1. However, the antenna feeding point is placed on the circuit board 21 of the upper casing 2. The same effect can be obtained also in the case of a configuration in which is arranged.

  The portable wireless device of the present invention has an effect of ensuring stable antenna characteristics regardless of changes in the state of opening and closing of the housing, and is useful for mobile phones, PHS, PDAs, and the like.

BRIEF DESCRIPTION OF THE DRAWINGS It is a front view of the portable radio | wireless machine which concerns on 1st Embodiment of this invention, (A) when a housing | casing is opened, (B) is a front view when a housing | casing is closed. VSWR characteristics at the time of opening and closing the case without the extension element in the portable radio shown in FIG. VSWR characteristics when opening and closing the case with an extension element in the portable wireless device shown in FIG. It is a front view of the portable radio concerning a 2nd embodiment of the present invention, (A) when a case is opened, (B) is a front view when a case is closed It is a front view of the portable radio concerning a 3rd embodiment of the present invention, (A) is a front view when a case is opened, and (B) is a front view when a case is closed. It is a front view of the portable radio concerning a 4th embodiment of the present invention, (A) when a case is opened, and (B) is a front view when a case is closed. It is a front view of the portable radio concerning a 5th embodiment of the present invention, (A) when a case is opened, and (B) is a front view when a case is closed. It is a front view of the portable radio concerning a 6th embodiment of the present invention, (A) when a case is opened, (B) is a front view when a case is closed Explanatory drawing which shows the structure of the extension element which concerns on 7th Embodiment of this invention. Front view showing the configuration of an antenna of a conventional portable radio

Explanation of symbols

1 Lower housing (first housing)
DESCRIPTION OF SYMBOLS 11 Circuit board 12 Wireless circuit 13 Feeding point 2 Upper housing (2nd housing)
DESCRIPTION OF SYMBOLS 21 Circuit board 22, 23 Liquid crystal display part 3 Hinge part 3A, 3B Hinge fixing | fixed part 3C Hinge movable part 30 Trap circuit 31 Metal body 32 Metal body fixing | fixed part 33 Metal object movable part 33A, 33B Protrusion (Means which can change antenna length )
34, 36, 37 Extension element 34A, 34B First extension element, second extension element 35 Antenna element 35A Projection (means capable of changing antenna length)
38A, 38B 3rd extension element, 4th extension element α1 VSWR characteristics with the casing open (when no extension element is used)
β1 VSWR characteristics when the case is closed (without extension element)
α2 VSWR characteristics when the housing is open (with extension element)
β2 VSWR characteristics when the housing is closed (with extension element)

Claims (11)

A first housing;
A second housing;
A hinge portion that connects the first housing and the second housing so as to be openable and closable;
An antenna provided in the hinge portion;
Means capable of changing the antenna length by opening and closing the housing;
A portable radio.   The portable antenna according to claim 1, wherein the antenna includes a hinge fixing portion and a hinge movable portion which are metal bodies constituting the antenna inside the hinge portion. The means capable of changing the antenna length is:
An extension element provided in the hinge fixing portion;
A projection provided on the hinge movable part for selectively connecting the extension element and the hinge movable part in conjunction with the opening / closing operation of the housing;
The portable wireless device according to claim 2, comprising:   4. The portable device according to claim 3, wherein the extension element of the hinge fixing portion is formed of a single element, and the extension element and the metal body are connected only when the casing is opened or only when the casing is closed. transceiver. The extension element of the hinge fixing part is composed of two elements, a first extension element and a second extension element,
The first extension element is connected when the metal body and the housing are opened,
The portable wireless device according to claim 3, wherein the second extension element is connected when the metal body and the housing are closed.   The portable wireless device according to claim 5, wherein a resonance circuit is provided between the first extension element, the second extension element, and the metal body.   The portable wireless device according to claim 1, wherein the antenna includes an antenna element provided in a hinge fixing portion that is a metal body inside the hinge. The means capable of changing the antenna length is:
An extension element provided in the hinge movable part;
A projection provided on the antenna element for selectively connecting the extension element and the antenna element of the hinge fixing portion in conjunction with the opening / closing operation of the housing;
The portable wireless device according to claim 7, comprising: The extension element provided on the hinge movable part is constituted by a single element,
The portable wireless device according to claim 8, wherein the extension element and the antenna element are connected only when the casing is opened or only when the casing is closed. The extension element provided in the hinge movable part is composed of two of a third extension element and a fourth extension element,
The third extension element and the antenna element are connected when the housing is opened,
The portable wireless device according to claim 8, wherein the fourth extension element and the antenna element are connected when the casing is closed.   The portable wireless device according to claim 10, wherein a resonance circuit is provided between the third extension element, the fourth extension element, and the antenna element.

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