JP2004242005A - Portable radio - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a folding portable radio apparatus that can secure high antenna performance even in a telephone call state and has no projection. <P>SOLUTION: The portable radio apparatus is equipped with a first antenna element 1 which is arranged in an upper case 4, a second antenna element 2 which is arranged in a lower case 5 and constitutes a dipole antenna with the first antenna element 1, and an expansion antenna element 3 which is provided in the upper case 4 to expand upward to outside the upper case 4; and the expansion antenna element 3 is equipped with an electric connection part 8 which is electrically connected to the first antenna element on the side of the upper case 4 when the expansion antenna element 3 is expanded. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a foldable portable radio having good antenna characteristics.
[0002]
[Prior art]
In general, a foldable mobile phone has a mechanism in which an upper housing and a lower housing are connected by a hinge and can be opened and closed, and can take two states, an open state and a closed state. For this reason, there are two advantages, that is, the convenience that the display screen viewed in the open state can be enlarged, and the portability that the display screen can be made compact in the closed state.
[0003]
Conventional foldable mobile phone antennas include a protruding antenna disposed on a lower housing (for example, see Patent Literature 1) and a protruding antenna disposed on an upper housing (for example, Patent Literature 2). See). Generally, helical antennas and telescopic monopole antennas are used for these protruding antennas, and since the antenna part protrudes from the housing, it is necessary to increase the antenna gain while holding the mobile phone by hand. It has the advantage that it can be done.
[0004]
On the other hand, as an antenna built in the housing of a conventional flip type mobile phone, a flip-shaped antenna such as a coiled antenna (for example, see Patent Document 3) or a microstrip line antenna (for example, see Patent Document 4) is used. Type antennas are known.
[0005]
[Patent Document 1]
Japanese Patent Application Laid-Open No. 2002-27066 [Patent Document 2]
JP 2001-45123 A [Patent Document 3]
JP-A-9-64778 [Patent Document 4]
JP 10-190330 A
[Problems to be solved by the invention]
However, in the above-described conventional foldable mobile phone, since the antenna portion has a protruding structure, when the mobile phone is taken out of a pocket or the like, the antenna portion is caught by a part of the pocket or the like and taken out. There was a problem that it was difficult.
[0007]
On the other hand, the above-described conventional flip-type mobile phone does not have such a problem because there is no portion protruding from the housing. However, there is a problem that the gain performance of the antenna is deteriorated when the flip part is closed because the body of the mobile phone and the antenna built in the flip part are close to each other. In addition, even when the flip unit is opened, there is a possibility that the antenna gain may be degraded if the antenna built in the flip unit is covered with a hand during a call.
[0008]
The present invention has been made in view of the above-described conventional problems and circumstances, and has as its object to provide a foldable portable wireless device having no protrusion that can ensure high antenna performance even during a call. And
[0009]
[Means for Solving the Problems]
In order to achieve the above object, a portable wireless device according to the present invention is a foldable portable wireless device having an openable and closable mechanism by connecting an upper housing and a lower housing with a hinge portion, An interior of one of the upper housing and the lower housing includes a telescopic antenna element that can be pulled out from the inside of the housing, and the telescopic antenna element is for pulling out the telescopic antenna element from inside the housing. In a housing having a knob at the tip and having the telescopic antenna element inside, the knob and the outer wall of the housing are faced with the telescopic antenna element housed inside the housing. A recess is provided so as to be one.
[0010]
For this reason, even when the user is holding a hand to make a call, a higher antenna gain can be obtained by pulling out the telescopic antenna element from the housing than in the housed state. Further, when the telescopic antenna element is housed in the housing, the portable wireless device has no projection, so that the portable wireless device can be smoothly inserted into and removed from a pocket or the like. Therefore, it is possible to provide a foldable portable wireless device having no projection that can ensure high antenna performance even in a call state.
[0011]
Further, the portable wireless device according to the present invention includes a first antenna element provided in the upper housing, and a dipole antenna together with the first antenna element when the upper housing and the lower housing are opened. A second antenna element provided in the lower housing, wherein the telescopic antenna element is electrically connected to the first antenna element or the second antenna element when pulled out of the housing. It is desirable to have a connecting portion for connecting electrically or electromagnetically at the end opposite to the knob.
[0012]
Further, in the portable wireless device according to the present invention, the extendable antenna element is electrically connected to the first antenna element or the second antenna element via a reactance element that absorbs a change in feed impedance. Therefore, a change in the feeding impedance can be absorbed by changing the electrical length of the dipole antenna according to the state of the telescopic antenna element. For this reason, it is possible to achieve good antenna performance in a call state regardless of the state of the telescopic antenna element.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of a portable wireless device according to the present invention will be described in detail with reference to the drawings in the order of [first embodiment] and [second embodiment].
[0014]
[First Embodiment]
FIG. 1 is a front view illustrating a portable wireless device according to a first embodiment of the present invention, and FIG. 2 is a side view illustrating a portable wireless device according to the first embodiment of the present invention. As shown in these drawings, in the portable wireless device of the first embodiment, the upper case 4 corresponding to the upper case and the lower case 5 corresponding to the lower case are connected by the hinge 6 in the claims. The portable wireless device is a folded type portable wireless device, and can take two states, an open state and a closed state, by rotating around the hinge 6. Note that the upper case 4 and the lower case 5 are formed of a molded product of a resin which is an insulator.
[0015]
The upper case 4 includes therein an antenna element 1 corresponding to the first antenna element described in the claims and a sound generating element 7. The antenna element 1 is a plate-like conductor plate. However, the present invention is not limited to the plate-like conductor plate, and may use, for example, a ground pattern of a circuit board provided in the upper case 4, a metal frame that mechanically supports the sound generating element 7, or constitutes the upper case 4 itself. A metal plate can also be used. The sound emitting element 7 is used when the user listens to a voice during a call, and a sound hole surface for emitting the sound is directed in the X direction in the coordinate system shown in FIG. The user makes a call by touching the vicinity of the sound element 7 on the X side outside the upper case 4 to his / her ear.
[0016]
Further, inside the upper case 4, the telescopic antenna element 3 made of, for example, a conductive shape memory alloy is arranged. The telescopic antenna element 3 is mechanically supported by utilizing frictional resistance with a sliding portion 9 formed on the inner wall of the upper case 4. A knob 10 is attached to the tip of the telescopic antenna element 3, and a part of the telescopic antenna element 3 is pulled out from the upper case 4 by pulling up the knob 10 as shown in FIGS. be able to. FIGS. 3 and 4 are a front view and a side view showing the portable wireless device of the first embodiment in a state where the extendable antenna element 3 is pulled out from the upper case 4.
[0017]
Further, inside the upper case 4, there is provided a connecting portion for electrically connecting the extendable antenna element 3 to the antenna element 1 when the extendable antenna element 3 is pulled out from the upper case 4 to the maximum. A corresponding connection terminal 8 is provided. The end 3a of the telescopic antenna element 3 has a shape that is bent inward as shown in FIG. Therefore, when the telescopic antenna element 3 is pulled out from the upper case 4, the bent end 3 a comes into contact with the connection terminal 8 as shown in FIG. 4. The connection terminal 8 and the antenna element 1 are connected via a reactance element 11. The reactance element 11 is a two-terminal circuit composed of, for example, a combination of a coil and a capacitor, and absorbs a change in feed impedance.
[0018]
The upper case 4 is provided with a recess h so that the knob 10 is flush with the outer wall of the upper case 4 when the telescopic antenna element 3 is completely housed in the upper case 4. Therefore, in this state, the upper case 4 has no protruding portion. When the telescopic antenna element 3 is stored in the upper case 4, the telescopic antenna element 3 does not contact the connection terminal 8. When the upper case 4 and the lower case 5 are opened, the antenna elements 1 and 2 operate as a dipole antenna.
[0019]
Further, the lower case 5 is provided with an antenna element 2 corresponding to the second antenna element in the claims, a matching circuit 13, and a radio circuit unit 14 therein. The antenna element 2 is configured by a ground pattern formed on substantially the entire surface of a circuit board on which the matching circuit and the radio circuit 14 are mounted. The matching circuit 13 matches the impedance of the antenna element 1 to 50Ω, and is connected to the antenna element 1 via the feed line 12. The wireless circuit section 14 performs signal processing on a transmission signal and a reception signal, and is connected to the antenna element 1 via the power supply line 12 and the matching circuit 13.
[0020]
The operation of the antenna in the portable wireless device of the present embodiment having the above components will be described. In the following description, it is assumed that the radio frequency is 900 MHz (wavelength is 333 mm).
[0021]
As described above, when the telescopic antenna element 3 as shown in FIGS. 1 and 2 is housed in the upper case 4, the antenna element 1 and the antenna element 2 operate as a dipole antenna. Assuming that the long side length of the antenna element 1 is L1 (= 70 mm) and the long side length of the antenna element 2 is L2 (= 80 mm), the total length of the dipole antenna composed of the antenna elements 1 and 2 is L1 + L2 (= 150 mm), which is 0.45 wavelength slightly shorter than 0.5 wavelength.
[0022]
On the other hand, when the telescopic antenna element 3 as shown in FIG. 3 and FIG. 4 is pulled out from the upper case 4 to the maximum, the antenna element 1 and the telescopic antenna element 3 are electrically connected. If the length is L3 (= 40 mm), the total length of the dipole antenna composed of the antenna elements 1 and 2 and the telescopic antenna element 3 is L1 + L2 + L3 (= 190 mm), which is 0.57 wavelength slightly longer than 0.5 wavelength. Become.
[0023]
When the total length of the dipole antenna changes, the feed impedance also changes, but the reactance element 11 provided in the upper case 4 absorbs the change. Therefore, the impedance matched by the matching circuit 13 does not change depending on the state of the telescopic antenna element 3.
[0024]
5 and 6 are a top view and a front view, respectively, showing a state in which the user holds the portable wireless device of the present embodiment shown in FIGS. Here, the horizontal (XY) plane averaging gain when the telescopic antenna element 3 is in the housed state shown in FIGS. 1 and 2 is mainly due to the function of the dipole antenna configuration of the antenna element 1 and the antenna element 2 and the dipole ratio gain. It is about -15 dBd. In this state, since the antenna element 2 is covered with the hand, radio wave radiation from the antenna element 2 is considerably suppressed. In addition, since the antenna element 1 is close to the user's ear, radio wave radiation from the antenna element 1 is also suppressed. That is, the electrical length of the dipole antenna is reduced.
[0025]
On the other hand, when the telescopic antenna element 3 is in the extended state shown in FIGS. 3 and 4, the telescopic antenna element 3 protrudes to a position away from the user's ear and head, so that radio wave radiation from the telescopic antenna element 3 is not emitted. It is not obstructed by the human body such as hands. Therefore, the antenna gain becomes relatively high, and the horizontal (XY) plane averaging gain is improved by the length L3 of the telescopic antenna element 3, and becomes, for example, about -11 dBd (dipole ratio gain).
[0026]
As described above, according to the portable wireless device of the present embodiment, even if the user holds the hand and makes a call, if the telescopic antenna element 3 is pulled out from the upper case 4, the antenna is higher than the stored state. Gain is obtained. Further, when the telescopic antenna element 3 is housed in the upper case 4, the portable wireless device of the present embodiment has no protrusion, so that the portable wireless device of the present embodiment can be smoothly inserted into and removed from a pocket or the like.
[0027]
Note that the length and shape of each of the antenna elements 1 and 2 described in the present embodiment are not limited to those described above, and similar effects can be obtained as long as the dipole antenna changes its electrical length due to extension or storage of the telescopic antenna element 3. Is obtained. Further, in the present embodiment, the reactance element 11 is provided between the connection terminal 8 and the antenna element 1. However, when the change of the feeding impedance due to the change of the state such as the extended state or the housed state does not matter, for example, expansion and contraction When the extension amount of the antenna element 3 is designed to be relatively small, the same effect can be obtained without the reactance element 11.
[0028]
Further, in the present embodiment, the connection terminal 8 and the telescopic antenna element 3 are electrically connected to each other, but electrodes are provided between the connection terminal 8 and the telescopic antenna element 3 so as to oppose each other. The telescopic antenna element 3 can also be electromagnetically connected to the connection terminal 8 by the electrostatic coupling. That is, the connection terminal 8 and the telescopic antenna element 3 can also be electromagnetically coupled to each other by electrostatic coupling using a gap provided therebetween.
[0029]
[Second embodiment]
FIG. 7 is a front view showing a portable wireless device according to a second embodiment of the present invention, and FIG. 8 is a side view showing a portable wireless device of the second embodiment according to the present invention. The portable wireless device of the second embodiment shown in these figures differs from the portable wireless device of the first embodiment in that a telescopic antenna element 3, a sliding contact portion 9, a knob 10, a connecting element 8, and a reactance element are provided. 11 is provided inside the lower case 5. As in the first embodiment, a knob 10 is attached to the tip of the telescopic antenna element 3, and when the knob 10 is pulled down, a part of the telescopic antenna element 3 is formed as shown in FIGS. 9 and 10. Can be pulled out from the lower case 5. FIG. 9 and FIG. 10 are a front view and a side view showing the portable wireless device of the second embodiment in a state where the extendable antenna element 3 is pulled out from the lower case 5.
[0030]
The lower case 5 is provided with a recess h so that the knob 10 is flush with the outer wall of the lower case 5 in a state in which the telescopic antenna element 3 is completely housed in the lower case 5. Therefore, in this state, the lower case 5 has no protruding portion.
[0031]
FIG. 11 is a front view showing a state in which the user holds the portable wireless device of the present embodiment shown in FIGS. Here, the horizontal (XY) plane averaging gain when the telescopic antenna element 3 is in the housed state as shown in FIGS. 7 and 8 has a dipole ratio gain of about −15 dBd as in the first embodiment. On the other hand, when the telescopic antenna element 3 is in the extended state shown in FIGS. 9 and 10, since the telescopic antenna element 3 protrudes to a position away from the user's ear and head, radio wave radiation from the telescopic antenna element 3 is not generated. It is not obstructed by the human body such as hands. Therefore, the antenna gain becomes relatively high, and the horizontal (XY) plane averaging gain is improved by the length L3 of the telescopic antenna element 3, and becomes, for example, about -12 dBd (dipole ratio gain).
[0032]
As described above, according to the portable wireless device of the present embodiment, even when the user holds the hand to make a call, if the telescopic antenna element 3 is pulled out from the lower case 5, an antenna higher than the stored state is obtained. Gain is obtained. Further, when the telescopic antenna element 3 is housed in the lower case 5, the portable wireless device of the present embodiment has no protrusion, so that the portable wireless device of the present embodiment can be smoothly inserted into and removed from a pocket or the like.
[0033]
【The invention's effect】
As described above, according to the portable wireless device of the present invention, even when the user holds a hand to make a call, if the telescopic antenna element is pulled out of the housing, a higher antenna gain than in the housed state is obtained. can get. Further, when the telescopic antenna element is housed in the housing, the portable wireless device has no projection, so that the portable wireless device can be smoothly inserted into and removed from a pocket or the like. Therefore, it is possible to provide a foldable portable wireless device having no projection that can ensure high antenna performance even in a call state.
[Brief description of the drawings]
FIG. 1 is a front view showing a portable wireless device according to a first embodiment of the present invention; FIG. 2 is a side view showing a portable wireless device according to a first embodiment of the present invention; FIG. FIG. 4 is a front view showing the portable wireless device of the first embodiment in a state of being pulled out from the upper case. FIG. 4 is a side view showing the portable wireless device of the first embodiment in a state where a telescopic antenna element is drawn out of the upper case. 5 is a top view showing a state in which the user holds the portable wireless device of the first embodiment and holds a telephone call. FIG. 6 is a diagram illustrating a state where the user holds the portable wireless device of the first embodiment and holds a call. FIG. 7 is a front view showing a portable wireless device according to a second embodiment of the present invention. FIG. 8 is a side view showing a portable wireless device of a second embodiment according to the present invention. 9 shows a portable wireless device according to a second embodiment in which the telescopic antenna element is pulled out from the lower case. FIG. 10 is a side view showing the portable wireless device of the second embodiment with the telescopic antenna element pulled out from the lower case. FIG. 11 is a diagram showing a portable wireless device of the second embodiment held by a user's hand. Front view showing the state of making a call by calling
1, 2 antenna element 3 telescopic antenna element 4 upper case 5 lower case 6 hinge part 7 sounding element 8 electric connection part 9 sliding contact part 10 knob part 11 reactance element 13 matching circuit 14 wireless circuit part

Claims (3)

A foldable portable wireless device having a mechanism that can be opened and closed by connecting an upper housing and a lower housing with a hinge portion,
Inside one of the upper housing and the lower housing, a telescopic antenna element that can be pulled out from the inside of the housing,
The telescopic antenna element has a knob at the tip for pulling out the telescopic antenna element from inside the housing,
The housing provided with the telescopic antenna element therein is provided with a concave portion so that the knob and the outer wall of the housing are flush with each other with the telescopic antenna element housed inside the housing. A portable wireless device characterized by the following. A first antenna element provided in the upper housing;
A second antenna element provided in the lower housing, the upper housing and the lower housing constituting a dipole antenna together with the first antenna element when the lower housing is opened,
When the telescopic antenna element is pulled out from the inside of the housing, an end of the connecting part that electrically or electromagnetically connects to the first antenna element or the second antenna element is opposite to the knob. 2. The portable wireless device according to claim 1, further comprising: The portable wireless device according to claim 2, wherein the telescopic antenna element is electrically connected to the first antenna element or the second antenna element via a reactance element that absorbs a change in feed impedance.

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