JP2006254092A - Folding portable radio device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem wherein antenna performance deteriorates in a portable field radio due to electromagnetic interaction, if a hand of a user approaches a resonant element improving call performance. <P>SOLUTION: The field radio comprises an upper cabinet 1, a lower cabinet, a hinge section 2 for connecting the upper cabinet 1 and the lower cabinet 2 in freely rotatable fashion, a circuit board 6 provided within the lower cabinet 2 for having a ground pattern, and an antenna element 7 arranged at the upper cabinet 1 side and received unbalance power supply in relation to the ground pattern. Extended elements 41, 42, 51, and 52 are arranged and separated from the circuit board 6 in a predetermined spacing along the longitudinal direction of the circuit board 6. Both ends of the extended elements 41, 42, 51, and 52 are electrically connected to the ground pattern. Resonant elements 43 and 53 for shutting off predetermined frequencies are placed at a position of substantially half of the extended elements 41, 42, 51, and 52. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an antenna of a foldable portable radio device, and more particularly to a foldable portable radio device capable of reducing local average SAR and obtaining high antenna performance in a state of being held and used by a user. About.

  In recent years, a technique for reducing a local average SAR (Specific Absorption Rate) is required for an antenna mounted on a portable wireless device. In general, when the antenna radiation pattern faces the human head side, the local average SAR tends to increase. Therefore, in order to reduce the SAR, it is necessary to direct the radiation pattern of the antenna to the side opposite to the human head. For this reason, a method of loading a parasitic element near the antenna feeding portion is known. That is, in Patent Document 1, for example, a parasitic element is loaded on the opposite side of the human head in a state parallel to the substrate ground operating as the ground conductor of the antenna. This parasitic element has its length set to about 1/2 wavelength of the radio frequency and is used as a waveguide element, so that the radiation pattern of the antenna is directed to the side opposite to the human head side and SAR is reduced. .

Further, when the antenna mounted on the portable wireless device is held and used by the user's hand, the antenna performance deteriorates due to the electromagnetic interaction between the user's hand and the antenna. Therefore, as a means for solving this problem, as shown in FIG. 7, for example, a configuration in which the metal portions of the upper casing 101 and the lower casing 102 of the folding portable wireless device are used as antennas has been proposed.
This foldable portable wireless device has a structure in which an upper case, which is an upper casing 101, and a lower case, which is a lower casing 102, are connected by a hinge 103, and rotates around the hinge 103. Thus, it can take two states, an open state and a closed state. The upper case and the lower case are made of a resin molded product that is an insulator.

Further, the folding portable wireless device has a metal frame 101A attached to the upper case. In general, the metal frame 101A is made of a metal having high conductivity, light weight and high strength, such as a magnesium alloy. Thereby, the strength of the thin upper case 101 is ensured and the metal frame 101A also operates as an antenna element. In general, the length of the long side of the metal frame 101A is about 90 mm.
Furthermore, this foldable portable wireless device has a metal frame 101A and a hinge metal fitting 103A that constitutes a part of a hinge part 103, which will be described later, attached to the upper case 101 with an attachment screw 101B. The metal fitting 103A is electrically connected, and the upper case and the hinge metal fitting 103A are mechanically fixed.

On the other hand, the hinge portion 103 includes a hinge fitting 103A, a hinge fitting 103B, and a rotating shaft 103C. The hinge fitting 103A, the hinge fitting 103B, and the rotating shaft 103C are made of conductive metal, and are electrically connected to each other at a contact point between them.
By attaching a part of the hinge metal fitting 103B and the power supply terminal 104 to the lower case with the attaching screw 102B, the hinge metal fitting 103B and the power supply terminal 104 are electrically connected, and the lower case and the hinge metal fitting 103B are mechanically connected. Fixed to.
On the other hand, the power feeding terminal 104 is connected to the radio circuit 105B via the antenna changeover switch 105A on the circuit board 105 disposed inside the lower case. The circuit board 105 is a printed circuit board on which circuit components that realize various functions of the portable wireless device are mounted, and a ground pattern serving as a circuit ground potential is formed on almost the entire surface.

With this configuration, the folding portable wireless device can ensure high antenna performance in a call state. In other words, the antenna using the metal portion of the upper and lower casings 101 and 102 and the antenna element 106 are selected by the antenna changeover switch 105A according to the use situation. In general, the antenna using the metal portion of the upper and lower housings is selected and used in a state where the portable radio is opened, and the antenna element 106 is selected in a state where the portable radio is closed. In the state where the antenna using the metal part of the upper and lower casings is selected, the circuit board is connected via the antenna changeover switch 105A in order to use the electrical length of the antenna element 106 as a resonant element at the operating frequency. One end of the antenna element 106 is electrically connected to the ground pattern 105. With this configuration, the main polarization direction of the radio wave can be set to the width direction of the portable wireless device, so that higher antenna efficiency can be ensured in a call state.
JP 2003-60417 A

  As described above, in the configuration in which the radiation pattern is directed to the opposite side of the human head using the parasitic element, there is no problem when the size of the portable wireless device is sufficiently large with respect to the use frequency. However, for example, at 900 MHz (1/2 wavelength is 16.6 cm) used in a mobile phone, it is difficult to mount inside a mobile radio, and even in a high frequency band (eg, 1950 MHz) There is a problem that the improvement effect is small when the holding state changes and the hand of the holder approaches the parasitic element. Further, in the configuration using the metal portion of the upper and lower casings as shown in the conventional example of FIG. 7, there is a problem that the antenna performance is slightly deteriorated when the user's hand is close to the antenna feeding unit and the antenna element. .

  The present invention has been made in view of the above circumstances, and provides a foldable portable wireless device capable of reducing SAR and ensuring high antenna performance when a user's holding state changes in a call state. With the goal.

  The foldable portable wireless device of the present invention includes a first casing, a second casing, a hinge portion that rotatably connects the first casing and the second casing, A circuit board provided in the second casing and having a ground pattern; and an antenna element that is unbalancedly fed to the ground pattern and disposed on the first casing side. An expansion element is disposed at a predetermined distance from the circuit board along the longitudinal direction, both ends of the expansion element are electrically connected to the ground pattern, and a predetermined frequency is set at a position approximately half of the expansion element. It is characterized by comprising a resonance element that cuts off. According to the above configuration, high antenna performance can be obtained in a call state regardless of a user's holding state while reducing SAR.

  In addition, the antenna device includes an antenna element provided in the first casing and a power feeding element connected to a wireless circuit on the circuit board, and the hinge portion includes a first hinge portion and a second hinge made of conductive metal. And a connecting portion that electrically connects the first hinge portion and the second hinge portion and rotatably supports the first hinge portion, and the first hinge portion is provided in the first casing. Electrically connected to the end of the antenna element, and the second hinge part is provided in the second casing and is arranged at a predetermined interval from a ground pattern on the circuit board. It is characterized by being electrically connected to. According to the above configuration, the antenna element, the hinge part, the power feeding element, and the ground pattern on the circuit board operate as a dipole antenna, and reduce the SAR, while maintaining the user's holding state and in the talking state. High antenna performance can be obtained.

  Further, at least two expansion elements are arranged. According to the above configuration, the antenna performance can be further improved in a call state.

  In the second casing, a reactance element and switching means for switching the reactance element are provided between an end of the expansion element and the circuit board. According to the above configuration, high antenna performance can be ensured at a plurality of frequencies.

  In addition, an opening / closing detection means for detecting an opening / closing state of the first casing and the second casing is provided, and the opening / closing detection means controls the switching means according to a detection result of the opening / closing state. Features. According to the above configuration, high antenna performance can be obtained in a state in which the folding portable wireless device is closed.

  ADVANTAGE OF THE INVENTION According to this invention, the folding portable radio | wireless apparatus which can ensure a high antenna performance can be provided in the state of a telephone call and the state where the housing | casing of a folding portable radio | wireless machine is closed.

Hereinafter, embodiments of a folding portable wireless device according to the present invention will be described in detail with reference to the accompanying drawings. Note that the radio frequency is set to 900 MHz and 1950 MHz.
[First embodiment]
1A and 1B are a rear view and a side view showing a basic configuration of a folding portable wireless device according to the first embodiment of the present invention. As with the conventional folding portable wireless device shown in FIG. 7, the upper casing (constituting the first casing) 1 and the lower casing (constituting the second casing) 2 can be freely opened and closed by the hinge portion 3. However, unlike the above-described conventional folding portable wireless device, the first extension element unit 4 and the second extension element are provided in the lower case constituting the lower casing 2. Part 5.

  In addition, as in the conventional folding portable wireless device shown in FIG. 7, this folding portable wireless device has a circuit board 6 disposed in the lower case. A changeover switch 61, a wireless circuit 62, and the like are provided. Further, this foldable portable radio device is similar to the above-described conventional foldable portable radio device, mainly an antenna element 7 used in a state in which the foldable portable radio device is closed, and an antenna changeover switch. And a power feeding terminal 8 connected to the radio circuit 62 via 61.

  The first expansion element portion 4 is a conductive sheet metal (for example, a copper plate having a thickness of 0.3 mm) disposed along the long side (longitudinal direction) edge of one side of the circuit board 6 having a substantially rectangular shape. The first expansion element 41, the second expansion element 42, and the first reactance element 43 are formed. The dimensions of the first expansion element portion 4 are 80 mm in length and 3 mm in width, and are arranged along the long side (longitudinal direction) edge of the circuit board 6 while keeping the distance between the circuit board 6 and D1. Here, the interval D1 is set to 5 mm.

The first extension element 41 has a size of 39 mm in length and 3 mm in width. One end is connected to the ground pattern of the circuit board 6 in the vicinity of the hinge portion 3 and the power supply terminal 8 on the circuit board 6 and the other end. Are arranged with a distance D1 from the circuit board 6 in the longitudinal direction of the board.
Like the first expansion element 41, the second expansion element 42 has a size of 39 mm in length and 3 mm in width, and one end is on the side facing the hinge portion 3 in the longitudinal direction of the substrate and the first The extension element 41 is electrically connected to the ground pattern of the circuit board 6 in the vicinity of the extension line in the longitudinal direction. The first expansion element 41 and the second expansion element 42 are electrically connected via the first reactance element 43.

  The first reactance element 43 is configured by a chip component of about 1 mm × 0.5 mm × 0.5 mm, and is configured by a combination of reactance constants that are open to a radio frequency of 1950 MHz. Here, for example, the inductor L = 27 nH and the capacitor C = 0.2 pF are set. By arranging the first reactance element 43, only the radio frequency 1950 MHz can be cut off. Accordingly, the first extension element 41 and the second extension element 42 operate as a resonant element having a wavelength of about ¼ at a radio frequency of 1950 MHz. On the other hand, since the first reactance element 43 is short-circuited at a radio frequency of 900 MHz, the first expansion element 41 and the second expansion element 42 are set as conductor elements having a length of 80 mm and a width of 3 mm. Thus, by installing the first reactance element 43, the first expansion element unit 4 operates as a different conductor element at radio frequencies of 900 MHz and 1950 MHz.

  On the other hand, the configuration of the second expansion element unit 5 is the same as that of the first expansion element unit 4 described above, and the circuit board 6 has a long side opposite to the first expansion element unit 4. Arranged along. In addition, the configurations of the third expansion element 51, the fourth expansion element 52, and the second reactance element 53 are the same as those of the first expansion element unit 4 described above, and thus detailed description thereof will be given here. Is omitted.

FIG. 2 is a perspective view showing a mechanical configuration of the folding portable wireless device according to the first embodiment of the present invention.
The connection between the first extension element portion 4 and the second extension element portion 5 and the circuit board 6 differs depending on the configuration of the portable wireless device, etc., but is generally shown in FIGS. 2 (B), (C), (D). It is realized with the configuration as follows. 2 (B), (C), and (D) are part of a side view of the foldable portable wireless device according to the present invention, between the first expansion element 41 and the circuit board 6. It is an enlarged connection part. In FIG. 2D, reference numeral 2A denotes a lower case constituting the lower housing 2, and 23 denotes a set screw.

  The connection structure shown in FIG. 2B has a configuration in which the connection pin 21 is raised from the circuit board 6 to ensure the connection with the first expansion element 41. The connection pin 21 includes a spring mechanism having a stroke in the thickness direction of the foldable portable wireless device, and ensures a connection state between the expansion element 41 and the circuit board 6 by a pressure contact force of the spring. Further, the connection pin 21 is plated with gold in order to ensure conduction.

  In the connection structure shown in FIG. 2C, a leaf spring 22 having a small stroke width is arranged on the circuit board 6 and a connection state between the circuit board 6 and the conductive sheet metal of the first expansion element 41 is secured by the pressure contact force. To do. The leaf spring 22 is also plated with gold to ensure conductivity.

  In the connection structure shown in FIG. 2D, the ground pattern 24 on the circuit board 6 and the end of the first expansion element 41 are crimped by using a set screw 23 and a nut 25, so The connection state of one expansion element 41 is secured.

  Next, the relationship between the first expansion element group P1 and the second expansion element group P2 and the user (living part) will be described with reference to FIG. Here, FIG. 3A is a rear view of the folding radio apparatus according to the present embodiment, and FIG. 3B is a state where the hand H of the user U holds the lower part of the lower housing 2 (lower case). C) shows a state in which the hand H of the user U holds the upper part of the lower housing 2 (lower case). The first expansion element 41 and the third expansion element 51 are referred to as a first expansion element group A, and the second expansion element 42 and the fourth expansion element 52 are referred to as a second expansion element group B.

First, the case where the radio frequency is 1950 MHz will be described. In this case, the first extension element group P1 and the second extension element group P2 operate as resonant elements having a quarter wavelength at a radio frequency of 1950 MHz.
In FIG. 3B, when the lower position of the lower case is held by the user's hand H, the second expansion element group P2 is effective as a resonance element due to electromagnetic interaction with the user's hand H. Get smaller. On the other hand, the first expansion element group P1 operates as a resonance element because the distance from the user's hand H is large. In this case, the call performance is improved by about 1 dB compared with the case where the first expansion element group P1 and the second expansion element group P2 are not provided.
In FIG. 5C, when the upper position of the lower case is held by the user's hand H, the first expansion element group P1 is electromagnetically affected by the user's hand H, contrary to the previous case. Thus, the effect as a resonance element is reduced. On the other hand, since the second expansion element group P2 is separated from the user's hand, it operates as a resonance element. Compared to the case where the first expansion element group P1 and the second expansion element group P2 are not provided, the call performance is improved by about 1.5 dB.
Here, the amount of improvement in FIG. 6C is large because the user's hand H is close to the antenna feeding portion, the amount of deterioration is slightly larger than in the state of FIG. This is because the improvement effect looks great.

  On the other hand, when the radio frequency is 900 MHz, the first and second expansion element groups P1 and P2 operate as a substrate ground extended on the opposite surface to the human head. In general, the local SAR is highest near the feeding point. This is because the energy density is highest around the power feeding section. Therefore, local SAR can be reduced by reducing the energy density in the vicinity of the power feeding unit. Since the first and second expansion element groups P1 and P2 act so as to disperse the energy in the vicinity of the power feeding unit on the side opposite to the human head, the local SAR is lowered.

  Next, the principle of operation of the first extension element unit 4 and the second extension element unit 5 will be described in detail with reference to FIG. 4 in particular regarding improvement in antenna performance (call performance) and reduction in local SAR. Here, an antenna that performs a dipole operation with the metal frame 11 and the circuit board 6 is referred to as a first antenna, and an antenna that includes an antenna element 7 disposed around the hinge portion 3 is referred to as a second antenna. The first antenna is an antenna that is mainly selected in a call state, and the second antenna is an antenna that is mainly selected in a standby state.

  FIGS. 4A and 4B show the first and second expansion element portions 4 and 5 and the metal frame 11 in the first antenna when the upper housing 1 and the lower housing 2 are opened. The current intensity distribution is shown. FIG. 4A shows the distribution at a radio frequency of 1950 MHz, and FIG. 4B shows the distribution at a radio frequency of 900 MHz. Further, arrows A and B in FIG. 4C indicate currents flowing through the circuit board 6 and the first expansion element portion 4 in the vicinity of the power feeding portion, respectively.

  A first distribution α1 and a second distribution α2 in FIG. 4A indicate current intensity distributions distributed in the first expansion element group P1 and the second expansion element group P2 at 1950 MHz. Here, the 1950 MHz band is cut off at high frequencies by the first reactance 43 and the second reactance 53. For this reason, the first expansion element group P1 and the second expansion element group P2 operate as quarter-wave resonance elements whose positions are open ends. In addition, since a plurality of resonant elements can be configured in the lower housing 2 (lower case), even if one of the improvement effects is reduced, the other can be complemented.

Next, the third distribution β1 and the fourth distribution β2 in FIG. 4B are current intensity distributions distributed in the metal frame and the first and second expansion element portions 4 and 5 at a radio frequency of 900 MHz, respectively. Is shown.
Since the first reactance element 43 and the second reactance element 53 operate as a short circuit at a radio frequency of 900 MHz, the first and second expansion element sections 4 and 5 operate equivalent to a board expanded from the circuit board 6. do. In the radio frequency 900 MHz band, since it operates as a half-wave dipole antenna, the maximum current position is in the vicinity of the power feeding unit, and since the energy density here is generally high, the local SAR around the power feeding unit is high.
At a radio frequency of 900 MHz, the current is distributed and distributed in the first and second expansion element portions 4 and 5, and thus operates so as to reduce the energy density in the vicinity of the power feeding portion. This reduces the local SAR.

  As described above, the foldable portable wireless device according to the present embodiment operates according to the holding state of the user, unlike a structure in which a resonant element is provided only at a specific location such as a conventional antenna. By changing the resonance element, high antenna performance (call performance) can always be ensured even if the user's holding state changes. Further, by connecting the resonant elements with the first and second reactance elements 43 and 53, it can operate as an expansion element that reduces local SAR in a frequency band that does not operate as a resonant element.

  Further, in the present embodiment, an example is given in which the upper housing 1 is configured by a metal frame. For example, even if the frame of the upper housing 1 is a non-conductive material such as resin, the upper housing 1 If it is the structure which can be fed to the ground pattern on the circuit board via the hinge part, the equivalent antenna performance can be ensured.

  In the present embodiment, the first to fourth expansion elements 41, 42, 51, and 52 are made of plate-like metal conductors. However, if the material is highly conductive, the same effect can be obtained with a flexible substrate or the like. Is obtained. Further, the shapes of the first to fourth expansion elements 41, 42, 51, 52 are not limited to the present embodiment, and the same effect can be obtained with a meander shape, an element loaded with a dielectric, or the like. Furthermore, in the present embodiment, the number of expansion element portions is set to two, but even if there are one or three or more, the resonant element that operates according to the holding state of the user is changed, and the reactance element is further connected between the resonant elements. If it is the structure which can be connected by, an equivalent effect can be acquired. In addition, it is desirable to install the expansion element at the end of the circuit board where the current is concentrated. However, even if it is a structure that can secure a clearance from the circuit components even at the center of the circuit board, the expansion element has a certain effect. Can be obtained.

[Second Embodiment]
Next, a second embodiment of the folding portable wireless device according to the present invention will be described in detail with reference to FIGS. FIG. 5 is a rear view showing the basic configuration of the foldable portable wireless device according to the second embodiment. In FIG. 5, the same reference numerals as those shown in FIG. 1 denote the same components, and a description thereof will be omitted.
In the foldable portable radio device according to the present embodiment, in order to switch the connection between the second and fourth expansion elements 42 and 52 and the circuit board 6 according to the state of the foldable portable radio device, the first The changeover switch 9A, the second changeover switch 9B, the detection unit 91, and the third and fourth reactance elements 92, 93 are further different from the foldable portable radio device of the first embodiment.

  The first change-over switch 9A and the second change-over switch 9B are connected to the second and fourth extension elements 42 and 52, respectively, and based on the detection result of the detection unit 91, the second and fourth extension switches The connection between the elements 42 and 52 and the circuit board 6 is switched.

  The first changeover switch 9A and the second changeover switch 9B are configured by switching elements such as SPDT (Single Pole Double Throw), for example, and the opening / closing state of the case of the folding portable wireless device of this embodiment is determined. The connection terminal is switched by a control signal from the detection unit 91 to be detected. The detection unit 91 is configured by, for example, a Hall element, and detects the closed state of the casing by detecting a magnetic field such as a magnet disposed in the upper case of the upper casing 1.

Next, the operation of the folding portable wireless device according to this embodiment will be described.
When the housing is open, the first antenna described above is selected. Further, the detection unit 91 determines that the housing is in an open state, and short-circuits the second and fourth expansion elements 42 and 52 and the circuit board 6 to the first and second change-over switches 9A and 9B. Control to do. In that case, the configuration of the antenna is the same as that of the first embodiment, and an equivalent operation is performed.
On the other hand, when the housing is closed, the second antenna is selected. At this time, the detection unit 91 determines that the detection unit 91 is in a closed state, and connects the second and fourth expansion elements 42 and 52 and the circuit board 6 via the third and fourth reactance elements 92 and 93, respectively. Thus, the first and second change-over switches 9A and 9B are controlled. Here, the third and fourth reactance elements 92 and 93 are set in an open state.

  Next, FIG. 6 has shown the side view in the state which the foldable portable radio | wireless machine which concerns on this embodiment closed. In FIG. 6, the same reference numerals as those in FIG. 1 or FIG. 5 denote the same components, and the description thereof is omitted.

  The fifth distribution γ1 represents the electric field strength distribution distributed on the first and third expansion elements 41 and 51 when the folding portable wireless device according to the present embodiment operates at a radio frequency of 1950 MHz. The sixth distribution γ2 represents the electric field strength distribution distributed on the first and second expansion element units 4 and 5 when the folding portable wireless device according to the present embodiment operates at a radio frequency of 900 MHz. ing.

  Since the third and fourth reactance elements 92 and 93 are set to be open, the first and second expansion element sections 4 and 5 are resonant with the second antenna described above at both the radio frequencies 900 MHz and 1950 MHz. Operates as an element. As a result, the standby performance of the second antenna is improved by about 1 dB.

  As described above, in the foldable portable wireless device of this embodiment, unlike a structure in which a resonant element is provided only at a specific location such as a conventional antenna, a resonance that operates according to a holding state of a user. By changing the elements (first and second expansion element portions 4 and 5), high antenna performance can always be ensured even if the user's holding state changes. Further, by connecting the resonant elements (first and second expansion element sections 4 and 5) with the third and fourth reactance elements 92 and 93, the local SAR is reduced in a frequency band where the resonant elements are not operated. It can be operated as a diminishing expansion element. In addition, high antenna performance is achieved even in the closed state by switching the connection between the resonant elements (first and second expansion element portions 4 and 5) and the circuit board 6 between the open state and the closed state of the housing. it can.

  In the present embodiment, the third and fourth reactance elements are set to open, but the same effect can be obtained if the expansion element operates as a resonance element in the second antenna in the closed state. . Furthermore, in the present embodiment, the number of expansion element portions is set to two, but even if there are one or three or more, the resonant element that operates according to the holding state of the user is changed, and the reactance element is further connected between the resonant elements. If it is the structure which can be connected by, an equivalent effect is acquired. In addition, the position of the expansion element is preferably the end of the circuit board where the current is concentrated. However, even if it is at the center of the circuit board, a certain effect can be obtained as long as the clearance with the circuit components can be secured. can get.

  The present invention is not limited to the embodiment described above, and can be implemented in various forms without departing from the gist of the present invention.

  The foldable portable wireless device of the present invention has an effect of ensuring high antenna performance regardless of a user's holding state in a call state. It is useful for portable radio devices having a radio frequency of 900 MHz.

(A) is a rear view explaining the structure of the foldable portable radio device according to the first embodiment of the present invention, (B) is a side view explaining the structure of the antenna portion. (A) is a perspective view mainly explaining the configuration of the antenna portion of the folding portable wireless device according to the first embodiment of the present invention, (B) is a connection structure of a circuit board and an expansion element using connection pins (C) is an explanatory view showing a connection structure between a circuit board and an expansion element using a connection spring, (D) is an explanatory view showing a connection structure between the circuit board and the expansion element using a screw. (A) is a rear view illustrating the antenna configuration of the folding portable wireless device according to the first embodiment of the present invention, (B) is an explanatory diagram showing a state where the lower case lower part is held by the user's hand, (C) is explanatory drawing which shows the state which hold | maintained the lower case upper part by the user's hand (A) is a current intensity distribution diagram of 1920 MHz in a state in which the first antenna is selected in the open state of the folding portable wireless device according to the first embodiment of the present invention, and (B) is the tatami type portable wireless device. 900 MHz current intensity distribution diagram in a state where the first antenna is selected in the state where the machine is open, (C) is an enlarged view of the main part showing the direction of the current in the circuit board and the expansion element The rear view explaining the antenna structure of the foldable portable radio based on the second embodiment of the present invention Explanatory drawing which shows the antenna structure and current intensity distribution of the foldable portable radio device according to the second embodiment of the present invention. (A) is a front view illustrating a conventional antenna configuration, and (B) is a side view thereof.

Explanation of symbols

1 Upper housing (first housing)
2 Lower housing (second housing)
3 Hinge part 4 1st expansion element part 41 1st expansion element 42 2nd expansion element 43 1st reactance element (resonance element)
5 Second Expansion Element 51 Third Expansion Element 52 Fourth Expansion Element 53 Second Reactance Element (Resonance Element)
6 Circuit board 61 Antenna selector switch 62 Radio circuit 7 Antenna element 8 Feeding terminal

Claims (5)

A first housing;
A second housing;
A hinge portion that rotatably connects the first housing and the second housing;
A circuit board provided in the second casing and having a ground pattern;
An unbalanced power supply to the ground pattern and an antenna element disposed on the first housing side,
An expansion element is disposed at a predetermined distance from the circuit board along the longitudinal direction of the circuit board,
Electrically connecting both ends of the expansion element to the ground pattern;
A foldable portable radio apparatus comprising a resonance element that cuts off a predetermined frequency at a position substantially half of the expansion element. An antenna element provided in the first housing;
A power feeding element connected to a wireless circuit on the circuit board,
The hinge part includes a first hinge part and a second hinge part made of conductive metal, and a connecting part that electrically connects the first hinge part and the second hinge part and rotatably supports the hinge part. And
The first hinge part is provided in the first casing and electrically connected to an end of the antenna element,
2. The folding device according to claim 1, wherein the second hinge portion is provided in the second casing, is disposed at a predetermined interval from a ground pattern on the circuit board, and is electrically connected to the power feeding element. Portable wireless device.   The foldable portable wireless device according to claim 1 or 2, wherein at least two expansion elements are arranged.   4. The device according to claim 1, further comprising: a reactance element and a switching unit that switches the reactance element between the end of the expansion element and the circuit board in the second casing. 5. Folding portable wireless device. An open / close detecting means for detecting open / closed states of the first housing and the second housing;
The foldable portable wireless device according to claim 4, wherein the open / close detection means controls the switching means according to a detection result of an open / close state.

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