JP2011142484A - Antenna device and radio terminal device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make an antenna device into a multi-band and low SAR by simple structure. <P>SOLUTION: The antenna device is provided with: a metal rotation hinge 108; a feeding part 401; a filter circuit 402; a radiation element 403; and a metal spring 501. Here, the filer circuit 402 is constituted so as to shield current with a frequency f1 and to pass current with a frequency f2. The antenna device is made into the multi-band by using the metal rotation hinge 108 and the metal spring 501 as an antenna element in the frequency f1, and using the metal rotation hinge 108, the metal spring 501, the filter circuit 402, and the radiation element 403 as the antenna element in the frequency f2. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

The present invention relates to an antenna device, and is suitable for application to, for example, a portable wireless terminal.

Future trends in mobile communication systems include expansion or addition of frequency bands and provision of new communication services in order to realize a more comfortable communication environment. Accordingly, portable radio terminal antennas tend to require a larger size or the addition of new antennas.
However, in recent years, communication devices such as portable wireless terminals have been widely used, and further downsizing of communication devices has been demanded. For this reason, it is necessary to reduce the size of the antenna as well.
Further, when a portable wireless terminal is placed on a metal plate such as a metal desk, that is, when the antenna and the metal plate are arranged close to each other, the antenna characteristics tend to deteriorate and communication quality tends to be impaired. For this reason, improvement of this characteristic is also necessary.
In this way, the antenna is required to achieve downsizing while maintaining or improving performance even under severe use conditions.

  Conventionally, there are technologies disclosed in Patent Literature 1 to Patent Literature 4 as antenna miniaturization or multiband technology. The contents disclosed in Patent Document 1 to Patent Document 4 will be described below.

  FIG. 16 is a diagram illustrating the antenna configuration of Patent Document 1. In FIG. In the antenna device 10, the metal rotating hinge 14 in the hinge portion 13 that opens and closes the first housing 11 and the second housing 12 is used as an antenna. For this reason, the antenna device described in Patent Document 1 can save space for the antenna without newly providing an antenna element, and can reduce the size of the device.

  As described above, the antenna device described in Patent Document 1 uses the metal rotary hinge as an antenna to reduce the size of the device.

  FIG. 17 is a diagram showing the antenna configuration of Patent Document 2. In FIG. In the antenna device 20, a metal rotary hinge 21 and a radiating element 22 are used as an antenna. FIG. 18 is a diagram illustrating an antenna configuration of Patent Document 3. In FIG. In the antenna device 30, a metal rotary hinge 31 and a radiating element 32 are used as an antenna. FIG. 19 is a diagram illustrating an antenna configuration of Patent Document 4. In FIG. In the antenna device 40, a metal rotary hinge 41 and a radiating element 42 are used as an antenna. For this reason, the antenna devices described in Patent Document 2 to Patent Document 4 can save space by using a metal rotary hinge as an antenna, and further, by providing a radiating element, miniaturization and multibanding can be achieved. be able to.

  As described above, the antenna devices described in Patent Document 2 to Patent Document 4 use the metal rotary hinge as an antenna and further include a radiating element, thereby reducing the size and multiband of the device.

JP 2007-88692 A JP 2009-94859 A JP 2009-94860 A JP 2009-124635 A

  However, since the antenna device of Patent Document 1 uses a metal rotary hinge as a single unit, it is difficult to make a multiband. In addition, when used as a cellular antenna, there is a problem in that the SAR (Specific Absorption Rate) is increased because the metal rotating hinge, that is, the antenna is close to the position of the cheek during a call.

  The antenna devices disclosed in Patent Document 2 to Patent Document 4 use a metal rotating hinge as an antenna and further include a radiating element to reduce the size and multiband. However, the metal rotating hinge is used in a low frequency band. Therefore, the metal rotary hinge must be a metal body having a large volume. In addition, the metal rotary hinge and the radiating element are fed without passing through the filter circuit, and each resonance frequency is adjusted by the electrical length, but the metal rotary hinge is a metal body with a large volume and has a wide band characteristic. In view of the fact that the metal rotating hinge and the radiating element are close to each other, it is difficult to improve the performance of the antenna due to the influence of electromagnetic coupling. That is, in order to improve the antenna characteristics, it is necessary to secure the isolation characteristics between the antennas. For example, it is necessary to secure the isolation characteristics by a method in which the radiating element protrudes from the metal rotating hinge. There is a problem that the size of the apparatus is increased.

  Although the antenna device of Patent Document 4 includes a slit portion so that a current of a desired frequency flows through each antenna from the reduction of the SAR, power is supplied without passing through a filter circuit. It is difficult to completely branch the current. In particular, since the metal rotary hinge is a metal body with a large volume and has a wide band, the leakage current to the metal rotary hinge in the frequency band that was attempted to flow through the radiating element is large, and it is difficult to significantly reduce the SAR. There's a problem.

  The present invention has been made in view of the above points, and by using a metal rotating hinge, a metal spring, a filter circuit, and a radiating element, it is possible to achieve a reduction in size, a multiband, a low SAR, a metal desk, and the like. An object of the present invention is to provide a hinge-integrated antenna device that improves antenna characteristics when a portable wireless terminal is placed on a metal plate.

In order to solve this problem, an antenna device according to the present invention is an antenna device provided in a foldable portable wireless terminal including a first housing and a second housing, and includes a power feeding unit and the first housing. And a metal rotating hinge that is electrically connected to the power feeding unit, and is electrically connected to the metal rotating hinge, and the first metal together with the metal rotating hinge. A metal body that operates at a frequency, and a filter circuit that is electrically connected to the metal body, blocks a current of the first frequency, and passes a current of a second frequency lower than the first frequency;
A radiating element connected to the filter circuit,
The metal rotary hinge, the metal body, the filter circuit, and the radiating element are configured to operate at the second frequency.

  With this configuration, a metal rotating hinge is also used as an antenna to save space, a filter circuit is used to reduce the number of bands, a metal body and a radiation element are used to reduce the SAR, and the metal body is By using it, the antenna characteristics on the metal plate are improved.

  According to the present invention, it is possible to reduce the size, multiband, and reduce the SAR with a simple structure, and to improve the antenna characteristics when a portable wireless terminal is placed on a metal plate such as a metal desk. Can do.

Schematic front view showing the configuration of a portable radio terminal to which the antenna device according to Embodiment 1 of the present invention is applied. 1 is a schematic rear view showing a configuration of a portable wireless terminal to which an antenna device according to Embodiment 1 of the present invention is applied. 1 is a schematic side view showing a configuration of a portable wireless terminal to which an antenna device according to Embodiment 1 of the present invention is applied. 1 is a schematic rear view showing the configuration of a portable wireless terminal equipped with an antenna device according to Embodiment 1 of the present invention. 1 is a schematic perspective view showing the configuration of an antenna device according to Embodiment 1 of the present invention. Schematic in which a closed portable wireless terminal equipped with an antenna device according to Embodiment 1 of the present invention is arranged on a metal plate. Schematic diagram showing the relationship between the coordinate system and the portable wireless terminal on the metal plate from which data was acquired Vertical polarization component of XY plane in portable wireless terminal on metal plate where data was acquired Schematic diagram in which a portable radio terminal at the time of opening provided with an antenna device according to Embodiment 1 of the present invention is arranged on a metal plate. Schematic which shows the state at the time of the telephone call of the portable radio | wireless terminal provided with the antenna apparatus which concerns on Embodiment 1 of this invention. Schematic perspective view showing the configuration of the antenna device according to Embodiment 2 of the present invention. Schematic perspective view showing the configuration of the antenna device according to Embodiment 3 of the present invention. Schematic perspective view showing the configuration of the antenna device according to Embodiment 4 of the present invention. Schematic perspective view showing the configuration of the antenna device according to Embodiment 5 of the present invention. Schematic perspective view showing the configuration of the antenna device according to Embodiment 6 of the present invention. The figure which shows the antenna structure of patent document 1 The figure which shows the antenna structure of patent document 2 The figure which shows the antenna structure of patent document 3 The figure which shows the antenna structure of patent document 4

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, components having the same configuration or function and corresponding parts are denoted by the same reference numerals and description thereof will not be repeated.

(Embodiment 1)
FIG. 1 is a schematic front view showing a configuration of a portable wireless terminal to which an antenna device according to Embodiment 1 of the present invention is applied. As shown in FIG. 1, the portable wireless terminal 100 according to the first embodiment includes a first housing 101 and a second housing 102, and the first housing 101 and the second housing 102 are hinge portions. 103 is rotatably connected and is configured to be opened and closed.

The first housing 101 has an operation unit 104 including various operation keys, and a microphone 105 for inputting sound.
Is provided. The second housing 102 includes a display unit 106 that displays various information and a receiver unit 107 that outputs a received voice.

  The hinge portion 103 that connects the first housing 101 and the second housing 102 is provided with a metal rotary hinge 108 having a substantially cylindrical shape or a substantially columnar shape made of a metal body. The metal rotary hinge 108 has a configuration in which a first member 109 and a second member 110 that rotate with each other are connected. Since the first member 109 is mechanically fixed to the first resin portion 111 configured in the first housing 101 and the second member 110 is mechanically fixed to the second resin portion 112 configured in the second housing 102, The first housing 101 and the second housing 102 can be freely rotated.

  FIG. 2 is a schematic rear view showing the configuration of the portable wireless terminal to which the antenna device according to Embodiment 1 of the present invention is applied. As shown in FIG. 2, the portable radio terminal 200 according to the first embodiment includes a first circuit board 201 in a first casing 101 and a second circuit board 202 in a second casing 102. . Here, the metal rotary hinge 108 and the first circuit board 201 are provided with a predetermined distance D1, and the metal rotary hinge 108 and the second circuit board 202 are provided with a predetermined distance D2. A signal cable 203 for transmitting information between the first circuit board 201 and the second circuit board 202 is provided on the opposite side of the metal rotating hinge 108 in the hinge portion 103. One end of the signal cable 203 is connected to the first circuit board 201 via the connector 204, and the other end is connected to the second circuit board 202 via the connector 205.

  FIG. 3 is a schematic side view showing a configuration of a portable radio terminal to which the antenna device according to Embodiment 1 of the present invention is applied. As shown in FIG. 3, the portable wireless terminal 300 according to the first embodiment has a distance D1 between the metal rotary hinge 108 and the first circuit board 201, the metal rotary hinge 108, and the second circuit even when the terminal is closed. A distance D2 from the substrate 202 is maintained.

  As described above, the metal rotary hinge 108 is suitable for use as an antenna because the predetermined distance D1 or D2 is secured from the substrate, that is, the metal body, at the time of opening and closing, so that the characteristic change at the time of opening and closing is small.

  FIG. 4 is a schematic rear view showing the configuration of the portable radio terminal equipped with the antenna device according to the first embodiment of the present invention. As shown in FIG. 4, the portable wireless terminal 400 according to the first embodiment includes a power supply unit 401 on the first circuit board 201 of the first housing 101, a metal rotating hinge 108 on the hinge unit, A third circuit board 404 in which a filter circuit 402 and a radiating element 403 are mounted on the two housings 102 is provided.

  FIG. 5 is a schematic perspective view showing the configuration of the antenna device according to Embodiment 1 of the present invention. As shown in FIG. 5, the antenna device 500 according to the first embodiment includes a metal rotary hinge 108, a first circuit board 201, a power feeding unit 401, a filter circuit 402, a radiating element 403, a third circuit board 404, a metal spring. 501 is provided.

  In FIG. 5, the first circuit board 201 is provided in the first housing 101 (not shown), and the shaded portion is the ground of the antenna device 500, and a wireless circuit (not shown) is mounted on the shaded portion. The The third circuit board 404 is provided in the second housing 102 (not shown), and the filter circuit 402 and the radiating element 403 are mounted thereon. Here, the metal spring 501 is disposed perpendicular to the metal rotary hinge 108.

  The metal rotary hinge 108 is connected to the power supply unit 401. The metal spring 501 is connected to the metal rotary hinge 108. The filter circuit 402 is connected to the metal spring 501. The radiating element 403 is connected to the filter circuit 402.

  Next, operations at the frequency f1 and the frequency f2 of the antenna device 500 according to the first embodiment will be described. Here, the frequency f1 and the frequency f2 have a relationship of frequency f1> frequency f2, and the filter circuit 402 has a characteristic of blocking the current of the frequency f1 and passing the current of the frequency f2.

  At the frequency f1, since the current at the frequency f1 is cut off by the filter circuit 402, the metal rotary hinge 108 and the metal spring 501 are used as antenna elements. At the frequency f2, since the current of the frequency f2 is passed through the filter circuit 402, the metal rotary hinge 108, the metal spring 501, the filter circuit 402, and the radiating element 403 are used as antenna elements.

  As described above, the metal rotary hinge 108 is also used as an antenna element having the frequency f1 and the frequency f2, thereby saving space. The filter circuit 402 cuts off the current of the frequency f1 and allows the current of the frequency f2 to pass to achieve multiband.

  FIG. 6 is a schematic view in which a closed portable wireless terminal equipped with the antenna device according to Embodiment 1 of the present invention is arranged on a metal plate. As shown in FIG. 6, in this state 600, the first housing 101, the second housing 102, the metal rotary hinge 108, the third circuit board 404, the metal spring 501, and the metal plate 601 are shown.

  When the antenna is arranged horizontally on the metal plate, the metal plate creates a mirror image of the antenna, and the antenna's radiation characteristic deteriorates because the anti-phase current of the antenna flows on the metal plate. However, when the antenna is arranged vertically on the metal plate, the antenna current is not canceled. Here, since the metal spring 501 is arranged to be perpendicular to the metal plate 601, the antenna current is not canceled by the mirror image.

  FIG. 7 is a schematic diagram showing the relationship between the portable wireless terminal on the metal plate from which data was acquired and the coordinate system. As shown in FIG. 7, the portable wireless terminal of this relationship 700 includes a first casing 101, a second casing 102, a metal rotary hinge 108, a first circuit board 201, a second circuit board 202, and a metal spring 501. The signal cable 203 (not shown) is provided and is disposed on the metal plate 601. Here, the metal rotary hinge 108 and the metal spring 501 are simulated by a copper wire having a diameter of 3 mm.

  FIG. 8 shows the vertical polarization component of the XY plane in the portable wireless terminal on the metal plate from which data was acquired. As shown in FIG. 8, the characteristic 800 is shown by a solid line that is normalized by the maximum value of the characteristic in the relationship 700. A broken line is a characteristic when there is no metal spring 501 from the relationship shown in 700. The characteristic 800 is obtained at a frequency of 2 GHz. The solid line represents the length of resonance with the metal rotary hinge 108 and the metal spring 501, and the broken line represents the length of resonance with the metal rotary hinge 108 alone.

  The solid line of this characteristic 800 is obtained by setting the length of the metal spring 501 to 5 mm, but the average gain is improved by about 1 dB compared to the broken line without the metal spring 501. As an example this time, the length of the metal spring 501 is 5 mm, but the average gain of the vertical polarization component in the XY plane on the metal plate 601 tends to improve as the length increases. For this reason, the length of the metal spring 501 may be designed in accordance with the quality required for the communication system.

  FIG. 9 is a schematic diagram in which an opened portable wireless terminal equipped with the antenna device according to Embodiment 1 of the present invention is arranged on a metal plate. As shown in FIG. 9, this state 900 shows the first housing 101, the second housing 102, the metal rotary hinge 108, the third circuit board 404, the metal spring 501, and the metal plate 601.

  When the antenna is arranged horizontally on the metal plate, the metal plate creates a mirror image of the antenna, and the antenna's radiation characteristics deteriorate because the antenna's reverse-phase current flows on the metal plate. However, when the antenna is arranged vertically on the metal plate, the antenna current is not canceled. Here, since the metal spring 501 includes a component perpendicular to the metal plate 601, the antenna current is not canceled by the mirror image in this component. For this reason, the average gain of the vertical polarization component is improved by the metal spring 501.

  FIG. 10 is a schematic diagram showing a state of a portable wireless terminal equipped with the antenna device 500 during a call. As shown in FIG. 10, in this state 1000, the first housing 101, the second housing 102, the metal rotary hinge 108, the third circuit board 404 on which the filter circuit 402 and the radiating element 403 are mounted, the metal spring 501, A human head 1001 is shown.

  At the frequency f1, the metal rotary hinge 108 and the metal spring 501 are used as antenna elements. At the frequency f2, the metal rotary hinge 108, the metal spring 501 and the filter circuit 402 and the radiating element 403 mounted on the third circuit board 404 are used. Are used as antenna elements. Here, the metal spring 501 and the third circuit board 404 are arranged at a position remote from the cheek, that is, the human head. Moreover, since the current is distributed in each direction, the SAR is reduced.

  As described above, according to the antenna device 500 according to the first embodiment, the portable wireless terminal is placed on a metal plate such as a metal desk, while achieving miniaturization, multiband, and low SAR. In this case, the antenna characteristics can be improved.

(Embodiment 2)
FIG. 11 is a schematic perspective view showing the configuration of the antenna device according to Embodiment 2 of the present invention. The second embodiment of the present invention is characterized in that a radiation element is added to the already described first embodiment of the present invention to change the arrangement position of the filter circuit.

  As shown in FIG. 11, the antenna device 1100 according to the second embodiment includes a metal rotary hinge 108, a first circuit board 201, a power feeding unit 401, a filter circuit 402, a radiating element 403, a third circuit board 404, a metal spring. 501 and a radiating element 1101 are provided.

  In FIG. 11, the first circuit board 201 is provided in the first housing 101 (not shown), and the shaded portion is the ground of the antenna device 1100, and a wireless circuit (not shown) is mounted on the shaded portion. The The third circuit board 404 is provided in the second housing 102 (not shown), and the filter circuit 402, the radiating element 403, and the radiating element 1101 are mounted thereon.

  The metal rotary hinge 108 is connected to the power supply unit 401. The metal spring 501 is connected to the metal rotary hinge 108. The radiating element 1101 is connected to the metal spring 501. The filter circuit 402 is connected to the radiating element 1101. The radiating element 403 is connected to the filter circuit 402.

  Next, operations at frequency f1 and frequency f2 of antenna apparatus 1100 according to Embodiment 2 will be described. Here, the frequency f1 and the frequency f2 have a relationship of frequency f1> frequency f2, and the filter circuit 402 has a characteristic of blocking the current of the frequency f1 and passing the current of the frequency f2.

  At the frequency f1, since the current at the frequency f1 is cut off by the filter circuit 402, the metal rotary hinge 108, the metal spring 501, and the radiating element 1101 are used as antenna elements. At the frequency f2, since the current of the frequency f2 is passed by the filter circuit 402, the metal rotary hinge 108, the metal spring 501, the radiating element 1101, the filter circuit 402, and the radiating element 403 are used as antenna elements.

  Since the electrical length of the frequency f1 can be increased by adding the radiating element and changing the arrangement position of the filter circuit in this manner, the size of the metal rotary hinge can be reduced.

  As described above, according to the antenna device 1100 according to the second embodiment, the portable radio terminal is placed on a metal plate such as a metal desk, while achieving miniaturization, multiband, and low SAR. In this case, the antenna characteristics can be improved.

(Embodiment 3)
FIG. 12 is a schematic perspective view showing the configuration of the antenna device according to Embodiment 3 of the present invention. The third embodiment of the present invention is characterized in that the radiating element mounted on the substrate of the first embodiment of the present invention described above is made of sheet metal.

  As shown in FIG. 12, the antenna device 1200 according to the third embodiment includes a metal rotary hinge 108, a first circuit board 201, a power feeding unit 401, a filter circuit 402, a third circuit board 404, a metal spring 501, and a radiating element. 1201 is provided.

  In FIG. 12, the first circuit board 201 is provided in the first housing 101 (not shown), and the shaded portion is the ground of the antenna device 1200, and a wireless circuit (not shown) is mounted on the shaded portion. The The third circuit board 404 is provided in the second housing 102 (not shown), and the filter circuit 402 is mounted thereon.

  The metal rotary hinge 108 is connected to the power supply unit 401. The metal spring 501 is connected to the metal rotary hinge 108. The filter circuit 402 is connected to the metal spring 501. The radiating element 1201 is connected to the filter circuit 402.

  Since the radiating element is made of sheet metal in this way, bending can be performed, so that it can be processed into various shapes depending on the mounting space.

  As described above, according to the antenna device 1200 according to the third embodiment, the portable radio terminal is placed on a metal plate such as a metal desk, while achieving miniaturization, multiband, and low SAR. In this case, the antenna characteristics can be improved.

(Embodiment 4)
FIG. 13 is a schematic perspective view showing the configuration of the antenna device according to Embodiment 4 of the present invention. The fourth embodiment of the present invention is characterized in that the feeding path from the feeding section is changed when the metal rotary hinge of the first embodiment of the present invention described above is provided on the second housing side.

  As shown in FIG. 13, the antenna device 1300 according to the fourth embodiment includes a metal rotary hinge 108, a first circuit board 201, a power feeding unit 401, a filter circuit 402, a third circuit board 404, a metal spring 501, and a radiating element. 1301 is provided. Here, the metal spring 501 is disposed perpendicular to the radiating element 1301.

  In FIG. 13, a first circuit board 201 is provided in a first housing 101 (not shown), and a radiating element 1301 is mounted thereon. The shaded portion of the first circuit board 201 is the ground of the antenna device 1300, and a wireless circuit (not shown) or the like is mounted on the shaded portion. The metal rotary hinge 108 and the third circuit board 404 are provided on the second housing 102 side (not shown).

  The radiating element 1301 is connected to the power supply unit 401. The metal spring 501 is connected to the radiating element 1301. The filter circuit 402 is connected to the metal spring 501. The metal rotary hinge 108 is connected to the filter circuit 402.

  Next, operations at the frequency f1 and the frequency f2 of the antenna device 1300 according to the fourth embodiment will be described. Here, the frequency f1 and the frequency f2 have a relationship of frequency f1> frequency f2, and the filter circuit 402 has a characteristic of blocking the current of the frequency f1 and passing the current of the frequency f2.

  At the frequency f1, since the current of the frequency f1 is cut off by the filter circuit 402, the radiating element 1301 and the metal spring 501 are used as antenna elements. At the frequency f2, since the current of the frequency f2 is passed by the filter circuit 402, the radiating element 1301, the metal spring 501, the filter circuit 402, and the metal rotary hinge 108 are used as antenna elements.

  As described above, when the metal rotary hinge is provided on the second housing side, it is possible to ensure the same antenna characteristics as in the first embodiment by changing the power feeding path from the power feeding unit.

  As described above, according to the antenna device 1300 according to the fourth embodiment, the portable wireless terminal is placed on a metal plate such as a metal desk, while achieving miniaturization, multiband, and low SAR. In this case, the antenna characteristics can be improved.

(Embodiment 5)
FIG. 14 is a schematic perspective view showing the configuration of the antenna device according to Embodiment 5 of the present invention. The fifth embodiment of the present invention is characterized in that the arrangement positions of the filter circuit and the metal spring of the first embodiment of the present invention already described are changed.

  As shown in FIG. 14, the antenna device 1400 according to the fifth embodiment includes a metal rotary hinge 108, a first circuit board 201, a power feeding unit 401, a filter circuit 402, a third circuit board 404, a metal spring 501, and a radiating element. 403 and a fourth circuit board 1401 are provided.

  In FIG. 14, the first circuit board 201 is provided in the first housing 101 (not shown), and the shaded portion is the ground of the antenna device 1400, and a wireless circuit or the like (not shown) is mounted on the shaded portion. The The fourth circuit board 1401 is provided in the second housing 102 (not shown), and the radiation element 403 is mounted thereon.

  The metal rotary hinge 108 is connected to the power supply unit 401. The filter circuit 402 is connected to the metal rotary hinge 108. The metal spring 501 is connected to the filter circuit 402. The radiating element 403 is connected to the metal spring 501.

  Next, operations at frequency f1 and frequency f2 of antenna apparatus 1400 according to Embodiment 5 will be described. Here, the frequency f1 and the frequency f2 have a relationship of frequency f1> frequency f2, and the filter circuit 402 has a characteristic of blocking the current of the frequency f1 and passing the current of the frequency f2.

  At the frequency f1, since the current at the frequency f1 is cut off by the filter circuit 402, the metal rotary hinge 108 is used as an antenna element. At the frequency f2, since the current of the frequency f2 is passed by the filter circuit 402, the metal rotary hinge 108, the filter circuit 402, the metal spring 501, and the radiating element 403 are used as antenna elements.

  As described above, the antenna characteristics can be secured even if the arrangement positions of the filter circuit and the metal spring are changed according to the mounting space.

  As described above, according to the antenna device 1400 according to the fifth embodiment, the portable wireless terminal is placed on a metal plate such as a metal desk, while achieving miniaturization, multibanding, and low SAR. In this case, the antenna characteristics can be improved.

(Embodiment 6)
FIG. 15 is a schematic perspective view showing the configuration of the antenna device according to Embodiment 6 of the present invention. The sixth embodiment of the present invention is characterized in that the arrangement positions of the filter circuit and the metal spring of the fourth embodiment of the present invention already described are changed.

  As illustrated in FIG. 15, the antenna device 1500 according to the sixth embodiment includes a metal rotary hinge 108, a first circuit board 201, a power feeding unit 401, a filter circuit 402, a metal spring 501, and a radiating element 1301. .

  In FIG. 15, the first circuit board 201 is provided in the first housing 101 (not shown), and the shaded portion is the ground of the antenna device 1500, and a wireless circuit (not shown) is mounted on the shaded portion. The

  The radiating element 1301 is connected to the power supply unit 401. The filter circuit 402 is connected to the radiating element 1301. The metal spring 501 is connected to the filter circuit 402. The metal rotary hinge 108 is connected to the metal spring 501.

  Next, operations at the frequency f1 and the frequency f2 of the antenna device 1500 according to the sixth embodiment will be described. Here, the frequency f1 and the frequency f2 have a relationship of frequency f1> frequency f2, and the filter circuit 402 has a characteristic of blocking the current of the frequency f1 and passing the current of the frequency f2.

  At the frequency f1, since the current at the frequency f1 is cut off by the filter circuit 402, the radiating element 1301 is used as an antenna element. At the frequency f2, since the current of the frequency f2 is passed by the filter circuit 402, the radiating element 1301, the filter circuit 402, the metal spring 501, and the metal rotary hinge 108 are used as antenna elements.

  As described above, the antenna characteristics can be secured even if the arrangement positions of the filter circuit and the metal spring are changed according to the mounting space.

  As described above, according to the antenna device 1500 according to the sixth embodiment, the portable wireless terminal is placed on a metal plate such as a metal desk, while achieving miniaturization, multibanding, and low SAR. In this case, the antenna characteristics can be improved.

  The antenna device according to the present invention achieves multiband and low SAR without causing an increase in size with a simple structure, and improves antenna characteristics when placed on a metal plate such as a metal desk. Therefore, it is useful as an antenna device in a portable wireless terminal.

10, 20, 30, 40, 500, 1100, 1200, 1300, 1400, 1500 Antenna device 11, 101 First housing 12, 102 Second housing 13, 103 Hinge portion 14, 21, 31, 41, 108 Metal Rotating hinge 22, 32, 42, 1101, 1201, 1301 Radiating element 100, 200, 300, 400 Portable wireless terminal 104 Operation unit 105 Microphone 106 Display unit 107 Reception unit 109 First member 110 Second member 111 First resin unit DESCRIPTION OF SYMBOLS 112 2nd resin part 201 1st circuit board 202 2nd circuit board 203 Signal cable 204,205 Connector 401 Feed part 402 Filter circuit 403 Radiation element 404 3rd circuit board 501 Metal spring 600 Portable radio | wireless at the time of closing on a metal plate Schematic layout of terminals 601 Metal plate 700 Data Schematic diagram showing the relationship between the portable wireless terminal on the obtained metal plate and the coordinate system 800 Vertical polarization component of the XY plane in the portable wireless terminal on the metal plate on which data was acquired 900 On the metal plate Schematic diagram showing arrangement of portable radio terminal when open 1000 Schematic diagram showing state of portable radio terminal during call 1001 Human head 1401 Fourth circuit board

Claims (5)

An antenna device provided in a foldable portable wireless terminal comprising a first housing and a second housing,
A power feeding unit;
A metal rotary hinge provided in a hinge portion for connecting the first housing and the second housing, and electrically connected to the power feeding portion;
A metal body,
A filter circuit that blocks current of a first frequency and allows current of a second frequency lower than the first frequency to pass;
A radiating element operating at the second frequency together with the metal rotating hinge, the metal body and the filter circuit;
An antenna device comprising: An antenna device provided in a foldable portable wireless terminal comprising a first housing and a second housing,
A power feeding unit;
A radiating element electrically connected to the power supply unit;
A metal body,
A filter circuit that blocks current of a first frequency and allows current of a second frequency lower than the first frequency to pass;
A metal rotating hinge that is provided in a hinge portion that connects the first housing and the second housing and operates at the second frequency together with the radiating element, the metal body, and the filter circuit;
An antenna device comprising: The antenna device according to claim 1 or 2, wherein
The antenna device according to claim 1, wherein the metal body is disposed perpendicular to the metal rotary hinge in a state where the first housing and the second housing are closed. The antenna device according to claim 1 or 2, wherein
The antenna device according to claim 1, wherein the metal body is disposed perpendicular to the metal rotary hinge in a state where the first housing and the second housing are opened. A wireless terminal device comprising the antenna device according to any one of claims 1 to 5.

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