WO2004001895A1 - 携帯無線機用アンテナ - Google Patents
携帯無線機用アンテナ Download PDFInfo
- Publication number
- WO2004001895A1 WO2004001895A1 PCT/JP2003/007708 JP0307708W WO2004001895A1 WO 2004001895 A1 WO2004001895 A1 WO 2004001895A1 JP 0307708 W JP0307708 W JP 0307708W WO 2004001895 A1 WO2004001895 A1 WO 2004001895A1
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- WO
- WIPO (PCT)
- Prior art keywords
- antenna
- circuit board
- inverted
- shaped
- plate
- Prior art date
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/12—Supports; Mounting means
- H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
- H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
- H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
- H01Q1/242—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use
- H01Q1/243—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use with built-in antennas
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q11/00—Electrically-long antennas having dimensions more than twice the shortest operating wavelength and consisting of conductive active radiating elements
- H01Q11/02—Non-resonant antennas, e.g. travelling-wave antenna
- H01Q11/04—Non-resonant antennas, e.g. travelling-wave antenna with parts bent, folded, shaped, screened or electrically loaded to obtain desired phase relation of radiation from selected sections of the antenna
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
- H01Q9/0442—Substantially flat resonant element parallel to ground plane, e.g. patch antenna with particular tuning means
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/30—Resonant antennas with feed to end of elongated active element, e.g. unipole
- H01Q9/42—Resonant antennas with feed to end of elongated active element, e.g. unipole with folded element, the folded parts being spaced apart a small fraction of the operating wavelength
Definitions
- the present invention relates to an antenna for a portable wireless device.
- the conventional built-in antenna has a directivity in which radiation in the direction of the human body is large, there is a problem that transmission and reception performance may be reduced due to the influence of the human body.
- An object of the present invention is to reduce the size and thickness of a portable wireless device while increasing the gain and the bandwidth.
- the subject of the present invention is a plate-shaped parasitic power supply having a longitudinal electrical length that is about one half of the wavelength, which is opposite to the plate surface of the circuit board to which the feeder element is connected.
- the subject of the present invention is to make the element width of the feeding element a certain width or more.
- the objective is to increase the gain, increase the bandwidth, and reduce the SAR, and to reduce the size and thickness of the portable wireless device.
- the antenna for a portable wireless device includes a circuit board for arranging a circuit of the portable wireless device, and one end of one of the circuit boards via a power supply point.
- a power supply element connected to a surface of the circuit board, and a non-powered plate that is arranged to face one of the other circuit surfaces of the circuit board and operates as a reflector with an electrical length in the longitudinal direction that is approximately half the wavelength.
- an antenna element BRIEF DESCRIPTION OF THE FIGURES
- FIG. 1 is a diagram illustrating a configuration of a portable wireless device antenna according to Embodiment 1 of the present invention
- FIG. 2 is a diagram illustrating a specific example of a portable wireless device antenna according to Embodiment 1
- FIG. FIG. 8 is a diagram showing an example of frequency band characteristics of the portable radio antenna according to the first embodiment
- FIG. 3B is a diagram showing an example of radiation characteristics of the portable radio antenna according to the first embodiment.
- FIG. 4 is a diagram showing a configuration of a portable radio device antenna according to Embodiment 2 of the present invention.
- FIG. 5 is a diagram showing a configuration of a portable radio device antenna according to Embodiment 3 of the present invention.
- Is a diagram showing a configuration of a portable wireless device antenna according to a fourth embodiment of the present invention
- FIG. 7 is a diagram showing a configuration of a portable wireless device antenna according to a fifth embodiment of the present invention
- FIG. 9 is a diagram showing a configuration of a portable radio antenna according to a sixth embodiment of the present invention.
- FIG. 9 is a diagram showing a configuration of a portable radio antenna according to a seventh embodiment of the present invention.
- a diagram showing a configuration of a portable wireless device antenna according to Embodiment 8 of the present invention
- FIG. 11A is a diagram showing a configuration of a mobile radio antenna according to Embodiment 9 of the present invention.
- FIG. 11B is a diagram showing a configuration of a parasitic element of the antenna for a portable wireless device according to Embodiment 9.
- FIG. 12A is a diagram showing a configuration of a portable wireless device antenna according to Embodiment 10 of the present invention.
- FIG. 12B is a diagram showing a detailed configuration of an antenna for a portable wireless device according to Embodiment 10 of the present invention.
- FIG. 13 is a diagram showing a configuration of an antenna for a portable wireless device according to Embodiment 11 of the present invention.
- FIG. 14 is a diagram illustrating a specific example of the antenna for a portable wireless device according to Embodiment 11, and FIG. 15A is an example of a frequency band characteristic of the antenna for a portable wireless device according to Embodiment 11.
- FIG. 15B is a diagram illustrating an example of a radiation pattern of the antenna for a portable wireless device according to Embodiment 11.
- FIG. 15C is a diagram showing another example of the radiation pattern of the antenna for a portable wireless device according to Embodiment 11.
- FIG. 16 is a diagram showing a configuration of a portable antenna for a portable water heater according to Embodiment 12 of the present invention.
- FIG. 17 is a diagram showing a configuration of a mobile radio antenna according to Embodiment 13 of the present invention.
- FIG. 1 is a diagram showing a configuration of an antenna for a portable wireless device according to Embodiment 1 of the present invention.
- the antenna for a portable wireless device shown in FIG. 1 includes an inverted L-shaped antenna 10, a circuit board 12, and a plate antenna 14.
- the antenna for a portable wireless device shown in FIG. 1 is built in the portable wireless device.
- the inverted L-shaped antenna 10 is a feed element whose one end is electrically connected to one plate surface of the circuit board 12 via a feed point.
- the inverted L-shaped antenna 10 Fire / absorb.
- the circuit board 12 is a circuit board of a portable wireless device, and is connected to circuit components including the inverted L-shaped antenna 10.
- the plate antenna 14 is provided opposite to the plate surface of the circuit board 12 to which the inverted L-shaped antenna 10 is connected, and the electrical length in the longitudinal direction is determined by the portable wireless device. This is a parasitic element that has approximately one-half the wavelength of radio waves for communication.
- the plate antenna 14 is electromagnetically coupled to the inverted L-shaped antenna 10 and the circuit board 12, and operates as a reflector.
- the dimensions of the inverted L-shaped antenna 10, the circuit board 12 and the plate antenna 14 and the distance from each other are adjusted to predetermined values, and the self-impedance of the inverted L-shaped antenna 10 and the plate antenna 1 are adjusted.
- the self-impedance and the mutual impedance between the inverted L-shaped antenna 10 and the plate antenna 14 that is, changing the coupling capacitance between each antenna
- the input of the portable antenna It is possible to widen the impedance.
- the plate antenna 14 can be operated as a reflector, so that it has a more unidirectional radiation pattern as compared to, for example, a case where a linear antenna or the like is operated as a reflector, and has a high gain.
- SAR Specific Absorption Rate
- FIG. 2 is a diagram illustrating a specific example of the antenna for a portable wireless device according to the present embodiment.
- the dimension in the longitudinal direction of the plate antenna 14 is 0.52 ⁇ (0.42 ⁇ + 0.1 ⁇ ), which is about half the wavelength.
- the length of the circuit board 12 is set to 0.42 ⁇ , which is shorter than the plate antenna 14. By adopting this dimension, the plate antenna 14 resonates with the radio wave to be communicated, and induces the same current distribution on the circuit board 12 as the plate antenna 14 to operate as a reflector.
- FIG. 3D is a diagram illustrating frequency band characteristics of the above-described antenna for a portable wireless device.
- the solid line shows the VS WR (Voltage Standing Wave Ratio) at each frequency of the above-mentioned portable radio antenna
- the dotted line shows the portable radio without the plate antenna 14.
- the VS WR at each frequency of the antenna is shown.
- the provision of the plate antenna 14 can achieve a wider band.
- FIG. 3B is a diagram showing the radiation characteristics ( ⁇ : ⁇ component on the negative surface) of the above-described portable radio antenna.
- the solid line indicates the radiation characteristics of the above-described portable radio antenna
- the dotted line indicates the radiation characteristics of the portable radio antenna without the plate antenna 14.
- a wider band is achieved by the parasitic element, and the electrical length in the longitudinal direction of the parasitic element is about half the wavelength of the radio wave to be communicated.
- a feature of the antenna for a portable wireless device is that the feeding element is arranged on a circuit board having a predetermined dimension by forming the feeding element in a meander shape.
- FIG. 4 is a diagram showing a configuration of a portable wireless device antenna according to the second embodiment.
- the antenna for a portable wireless device shown in the figure employs a configuration having a meandering antenna 20 instead of the inverted L-shaped antenna 10 of the antenna for a portable wireless device shown in FIG.
- the other parts are the same as those of the portable wireless device antenna shown in FIG. 1, and thus the description thereof is omitted.
- the meander antenna 20 is a feed element whose one end is electrically connected to one plate surface of the circuit board 12 via a feed point, and is a meander-shaped antenna element.
- the meandering antenna 20 radiates radio waves and performs Z absorption.
- the plate-like antenna 14 is electromagnetically coupled to the meander-like antenna 20 and the circuit board 12 and operates as a reflector.
- the dimensions of the meander antenna 20, the circuit board 12 and the plate antenna 14 and the distance from each other are adjusted to predetermined values, and the self-impedance of the meander antenna 20 and the plate antenna 1 are adjusted.
- the self-impedance of FIG. 4 and the mutual impedance of the meandering antenna 20 and the plate antenna 14 it is possible to widen the input impedance of the portable radio antenna.
- the plate antenna 14 can be operated as a reflector, and has a more unidirectional radiation Z absorption pattern than, for example, a case where a linear antenna or the like is operated as a reflector. Therefore, high gain and SAR reduction can be realized.
- the meandering antenna 20 as the feed element, the electrical length of the feed element can be adjusted in accordance with the short-side dimension of the circuit board 12, and the size of the antenna for the portable wireless device can be reduced. Can be achieved.
- the feeding element is a meander-shaped antenna, the size of the antenna for a portable wireless device can be reduced.
- a feature of the mobile radio antenna according to the third embodiment of the present invention is that the self-impedance of the inverted L-shaped antenna is adjusted by loading the inverted L-shaped antenna with a lumped constant.
- FIG. 5 is a diagram showing a configuration of a portable wireless device antenna according to the third embodiment.
- the portable radio antenna shown in the figure employs a configuration in which a lumped constant 30 is loaded on the inverted L-shaped antenna 10 of the portable radio antenna shown in FIG.
- the other parts are the same as those of the portable radio antenna shown in FIG. 1, and a description thereof will be omitted.
- the lumped constant 30 is loaded on the inverted L-shaped antenna 10 and adjusts the self-impedance of the inverted L-shaped antenna 10.
- the dimensions of the inverted L-shaped antenna 10, the circuit board 12, and the plate antenna 14 are And the distance between each other to a predetermined value, the self-impedance of the inverted L-shaped antenna 10, the self-impedance of the planar antenna 14, and the mutual impedance of the inverted L-shaped antenna 10 and the planar antenna 14.
- the input impedance of the portable wireless device antenna can be broadened.
- the self-impedance of the inverted L-shaped antenna 10 by the lumped constant 30, the dimensions of the inverted L-shaped antenna 10 can be matched to the dimensions of the circuit board 12 in the short direction.
- the size of the antenna for the portable wireless device can be reduced.
- the size of the antenna for the portable wireless device can be reduced.
- a feature of the antenna for a portable wireless device according to Embodiment 4 of the present invention is that the lumped constant is loaded on the plate antenna to adjust the self-impedance of the plate antenna.
- FIG. 6 is a diagram showing a configuration of a portable wireless device antenna according to a fourth embodiment.
- the portable wireless device antenna shown in the figure employs a configuration in which a lumped constant 40 is loaded on the plate antenna 14 of the portable wireless device antenna shown in FIG.
- the other parts are the same as those of the portable radio antenna shown in FIG. 1, and the description thereof is omitted.
- the lumped constant 40 is loaded on the plate antenna 14 and adjusts the self-impedance of the plate antenna 14.
- the dimensions of the inverted L-shaped antenna 10, the circuit board 12 and the plate antenna 14 and the distance from each other are adjusted to predetermined values, and the self-impedance of the inverted L-shaped antenna 10 and the plate antenna 1 are adjusted.
- the input impedance of the portable radio antenna can be broadened.
- the self-impedance of the plate antenna 14 by the lumped constant 40, the dimensions of the plate antenna 14 can be adjusted to the dimensions of the circuit board 12 so that the antenna for the portable radio can be used.
- the size can be reduced.
- the lumped constant is loaded on the plate-shaped antenna, it is possible to reduce the size of the antenna for the portable springless machine.
- Embodiment 5 The characteristic of the antenna for a portable wireless device according to Embodiment 5 of the present invention is that, by disposing the inverted L-shaped antenna vertically on the circuit board, transmission / reception of radio waves perpendicular to the circuit board is achieved. This is the point that trust is possible.
- FIG. 7 is a diagram showing a configuration of an antenna for a portable wireless device according to the fifth embodiment.
- the antenna for a portable wireless device shown in the figure employs a configuration having an inverted L-shaped antenna 50 instead of the inverted L-shaped antenna 10 of the antenna for a portable wireless device shown in FIG.
- the other parts are the same as those of the portable radio antenna shown in FIG. 1, and the description thereof is omitted.
- the inverted L-shaped antenna 50 is a feed element whose one end is perpendicularly connected to one plate surface of the circuit board 12 via a feed point.
- the inverted L-shaped antenna 50 emits / absorbs radio waves. Since the inverted L-shaped antenna 50 has a portion perpendicular to the plate surface of the circuit board 12, the inverted L-shaped antenna 50 can radiate and absorb a radio wave in a direction perpendicular to the plate surface of the circuit board 12.
- the dimensions of the inverted L-shaped antenna 50, the circuit board 12 and the plate antenna 14 and the distance from each other are adjusted to predetermined values, and the self-impedance of the inverted L-shaped antenna 50, the plate antenna 1
- the plate antenna 14 can be operated as a reflector, and has a more unidirectional radiation / absorption pattern than a case where a linear antenna or the like is operated as a reflector. Gain and SAR reduction can be realized.
- the inverted L-shaped antenna has a portion perpendicular to the circuit board, it is possible to transmit and receive radio waves in a direction perpendicular to the circuit board. (Embodiment 6)
- the feature of the antenna for a portable wireless device according to Embodiment 6 of the present invention is that the self-impedance of the feed element is adjusted by using an inverted-F antenna as the feed element.
- FIG. 8 shows a configuration of an antenna for a portable wireless device according to the sixth embodiment.
- the antenna for a portable wireless device shown in the figure employs a configuration having an inverted F-shaped antenna 60 instead of the inverted L-shaped antenna 10 of the antenna for a portable wireless device shown in FIG.
- the other parts are the same as those of the portable radio antenna shown in FIG. 1, and the description thereof is omitted.
- the inverted F-shaped antenna 60 is a feed element in which one end of three ends is electrically connected to one plate surface of the circuit board 12 via a feed point, and the antenna element is an inverted F-shaped antenna. It was made.
- the inverted F-shaped antenna 60 emits / absorbs radio waves.
- the dimensions of the inverted F-shaped antenna 60, the circuit board 12 and the plate antenna 14 and the distance from each other are adjusted to predetermined values, and the self-impedance of the inverted F-shaped antenna 60, the plate antenna 1
- the input impedance of the portable radio antenna can be broadened.
- the plate antenna 14 can be operated as a reflector, and has a more unidirectional radiation / absorption pattern as compared to a case where a linear antenna or the like is operated as a reflector. Gain and SAR reduction can be realized.
- a wider band is achieved by the parasitic element, and the electrical length in the longitudinal direction of the parasitic element is about half the wavelength of the radio wave to be communicated.
- the feature of the antenna for a portable wireless device according to Embodiment 7 of the present invention is that The point is that the self-impedance of the feed element is adjusted by making the shape a folded shape.
- FIG. 9 is a diagram showing a configuration of an antenna for a portable wireless device according to the seventh embodiment.
- the antenna for a portable wireless device shown in the figure employs a configuration having a folded antenna 70 instead of the inverted L-shaped antenna 10 of the antenna for a portable wireless device shown in FIG.
- the other parts are the same as those of the portable radio antenna shown in FIG. 1, and the description thereof is omitted.
- the folded antenna 70 is a feed element whose one end is electrically connected to one plate surface of the circuit board 12 via a feed point and the other end is connected to the circuit board 12.
- the antenna element has a folded shape.
- the folded antenna 70 emits / absorbs radio waves.
- the dimensions of the folded antenna 70, the circuit board 12 and the plate antenna 14 and the distance from each other are adjusted to predetermined values, and the self-impedance of the folded antenna 70 and the self- By changing the impedance and the mutual impedance between the folded antenna 70 and the plate antenna 14, it is possible to broaden the input impedance of the portable radio antenna.
- the plate antenna 14 can be operated as a reflector, and has a more unidirectional radiation Z absorption pattern as compared with a case where a linear antenna or the like is operated as a reflector, for example. Gain and SAR reduction can be realized.
- a wider band is achieved by the parasitic element, and the electrical length in the longitudinal direction of the parasitic element is about half the wavelength of the radio wave to be communicated.
- FIG. 10 is a diagram showing a configuration of a portable wireless device antenna according to the eighth embodiment.
- the antenna for a portable wireless device shown in the figure employs a configuration having a circuit board 80 instead of the circuit board 12 of the antenna for a portable wireless device shown in FIG.
- the other parts are the same as those of the portable radio antenna shown in FIG. 1, and the description thereof is omitted.
- the circuit board 80 is a circuit board of a portable wireless device, to which circuit components including the inverted L-shaped antenna 10 are connected, and which has a hollow slot at the center.
- the dimensions of the inverted L-shaped antenna 12, the circuit board 80, and the plate antenna 14 and the distance from each other are adjusted to predetermined values, and the self-impedance of the inverted L-shaped antenna 10, the plate antenna 1
- the input impedance of the portable wireless device antenna can be broadened.
- the plate antenna 14 can be operated as a reflector, and has a more unidirectional radiation Z absorption pattern as compared with a case where a linear antenna or the like is operated as a reflector, for example. Gain and SAR reduction can be realized.
- the slot is provided at the center of the circuit board, it is possible to reduce the capacity and weight of the portable radio antenna.
- a feature of the antenna for a portable wireless device is that the provision of a slot in the plate-shaped antenna achieves a smaller capacity and a lighter weight.
- FIG. 11A is a diagram showing a configuration of an antenna for a portable wireless device according to the ninth embodiment.
- the antenna for a portable wireless device shown in the figure employs a configuration having a plate antenna 90 instead of the plate antenna 14 of the antenna for a portable wireless device shown in FIG.
- the other parts are the same as those of the portable radio antenna shown in FIG. 1, and the description thereof is omitted. You.
- the plate antenna 90 is provided so as to oppose the plate surface of the circuit board 12 opposite to the plate surface to which the inverted L-shaped antenna 10 is connected, and the electrical length in the longitudinal direction is determined by the portable wireless device. It is a parasitic element that has about half the wavelength of the radio waves to be communicated, and has a hollow slot in the center (see Fig. 11B).
- the plate antenna 90 is electromagnetically coupled to the inverted L-shaped antenna 10 and the circuit board 12, and operates as a reflector.
- the dimensions of the inverted L-shaped antenna 10, the circuit board 12 and the plate antenna 90 and the distance from each other are adjusted to predetermined values, and the self-impedance of the inverted L-shaped antenna 10 and the plate antenna 9 are adjusted.
- the input impedance of the portable radio antenna can be broadened.
- the plate antenna 90 can be operated as a reflector, and has a more unidirectional radiation Z absorption pattern as compared to, for example, a case where a linear antenna or the like is operated as a reflector. Gain and SAR reduction can be realized.
- the portable wireless device antenna performs transmission and reception of radio waves
- current flows through the plate antenna 90, but the current mainly flows through the peripheral portion of the plate antenna 90. There is no effect on the transmission / reception characteristics of the radio antenna.
- the slot is provided at the center of the plate-shaped antenna, it is possible to reduce the capacity and the weight of the antenna for a portable wireless device.
- a feature of the portable wireless device antenna according to Embodiment 10 of the present invention is that the distance between the circuit board and the plate antenna is reduced by inserting a dielectric into the gap between the circuit board and the plate antenna. In addition, it is intended to reduce the height and integrate.
- FIG. 12A is a diagram showing a configuration of the antenna for a portable wireless device according to Embodiment 10. is there.
- the antenna for a portable wireless device shown in the figure employs a configuration having a dielectric 100 in addition to the antenna for a portable wireless device shown in FIG.
- Dielectric 100 is inserted into the gap between circuit board 12 and plate antenna 14
- the dimensions of the inverted L-shaped antenna 10, the circuit board 12 and the plate antenna 14 and the thickness of the dielectric 100 are adjusted to predetermined values, and the self-input of the inverted L-shaped antenna 10 is adjusted.
- the input impedance of the portable radio antenna is broadened. be able to.
- the plate antenna 14 can be operated as a reflector, and, for example, has a more unidirectional radiation absorption pattern as compared to a case where a linear antenna or the like is operated as a reflector, and has a high gain. And SAR reduction can be realized.
- the distance between the circuit board 12 and the plate antenna 14 can be reduced, and the portable radio can be used.
- the mechanical antenna can be integrated.
- the dielectric is inserted into the gap between the circuit board and the plate antenna, the height of the portable radio antenna can be reduced and the antenna can be integrated.
- the feature of the antenna for a portable wireless device according to Embodiment 11 of the present invention is that the interval between the feeding element and the parasitic element is reduced by making the shape of the feeding element plate-shaped.
- FIG. 13 is a diagram showing a configuration of a portable radio antenna according to Embodiment 11 of the present invention.
- the antenna for a portable wireless device shown in the figure employs a configuration having a plate-shaped inverted L-shaped antenna 110 instead of the inverted L-shaped antenna 10 of the antenna for a portable wireless device shown in FIG.
- Other parts are the same as those of the portable radio antenna shown in FIG. Therefore, the description is omitted.
- the plate-shaped inverted L-shaped antenna 110 is a feed element whose one end is electrically connected to one plate surface of the circuit board 12 via a feed point, and is a short-side portion of the circuit board 12.
- the element width is more than a certain width.
- the plate-shaped inverted L-shaped antenna 110 emits and absorbs radio waves.
- the dimensions of the plate-shaped inverted L-shaped antenna 110, the circuit board 12 and the plate-shaped antenna 14 and the distance from each other are adjusted to predetermined values, and the self-impedance of the plate-shaped inverted L-shaped antenna 110 is adjusted.
- the self-impedance of the plate antenna 14 and the mutual impedance between the plate-shaped inverted L-shaped antenna 110 and the plate antenna 14 that is, by changing the coupling capacitance between the antennas
- the transmission frequency band it is possible to widen the bandwidth of the antenna for a portable wireless device.
- FIG. 14 is a diagram showing a specific example of the antenna for a portable wireless device according to the present embodiment.
- the dimension of the plate antenna 14 in the longitudinal direction is 0.52 ⁇ , which is about a half of the wavelength.
- the length of the circuit board 12 is set to 0.42; 1, which is shorter than the plate antenna 14.
- FIG. 15D is a diagram showing the frequency band characteristics of the portable radio antenna.
- the solid line shows the VSWR (Voltage Standing Wave Ratio) at each frequency of the antenna for the portable radio described above, and the dotted line shows the VSWR at each frequency of the antenna for the portable radio without the plate antenna 14. Indicates WR.
- the provision of the plate antenna 14 enables Bandwidth can be widened.
- FIG. 15B is a diagram showing a radiation pattern (a vertical component in the XY plane) in the reception frequency band of the antenna for a portable wireless device.
- FIG. 15C is a diagram showing a radiation pattern (a vertical component on the XY plane) in the transmission frequency band of the antenna for a portable wireless device described above.
- the antenna for the portable wireless device according to the present embodiment has a plate-shaped antenna 14 that operates as a reflector, so that the antenna is opposite to the human body in the transmission frequency band (_ X Direction).
- a wider band is achieved by the parasitic element, and the electrical length in the longitudinal direction of the parasitic element is about half the wavelength of the radio wave to be communicated.
- the feature of the antenna for a portable wireless device according to Embodiment 12 of the present invention is that the self-impedance of the plate-shaped inverted L-shaped antenna is adjusted by loading the plate-shaped inverted L-shaped antenna with a lumped constant. is there.
- FIG. 16 is a diagram illustrating a configuration of the antenna for a portable wireless device according to Embodiment 12.
- the mobile radio antenna shown in the figure employs a configuration in which a lumped constant 120 is loaded on the plate-shaped inverted L-shaped antenna 110 of the mobile radio antenna shown in FIG.
- the other parts are the same as those of the portable radio antenna shown in FIG. 13, and thus the description thereof is omitted.
- the lumped constant 120 is loaded on the inverted inverted L-shaped antenna 110 to adjust the self-impedance of the inverted inverted L-shaped antenna 110.
- the dimensions and the distance between the plate-shaped inverted L-shaped antenna 110, the circuit board 12 and the plate-shaped antenna 14 are adjusted to predetermined values, and the plate-shaped inverted L-shaped antenna 110 is adjusted.
- Self-impedance, self-impedance of plate antenna 14 and plate-shaped inverted L-shape By changing the mutual impedance between the antenna 110 and the plate antenna 14 (ie, changing the coupling capacitance between the antennas), it is possible to increase the bandwidth of the portable radio antenna particularly in the transmission frequency band. Can be planned.
- the dimension of the plate-shaped inverted L-shaped antenna 110 can be adjusted in the lateral direction of the circuit board 12. Therefore, the size of the antenna for the portable wireless device can be reduced.
- the band is particularly high in the reception frequency band. Can be secured. As a result, the size and thickness of the mobile radio antenna can be reduced.
- the antenna for the portable wireless device can be further reduced in size.
- the feature of the antenna for a portable wireless device according to Embodiment 13 of the present invention is that the self-impedance of the circuit board is adjusted by loading the circuit board with a lumped constant.
- FIG. 17 is a diagram showing the configuration of the antenna for a portable wireless device according to Embodiment 13.
- the portable wireless device antenna shown in the figure has a configuration in which a lumped constant 130 is loaded on the circuit board 12 of the portable wireless device antenna shown in FIG.
- the other parts are the same as those of the portable radio antenna shown in FIG. 13, and the description thereof is omitted.
- the lumped constant 130 is loaded on the circuit board 12 and adjusts the self-impedance of the circuit board 12.
- the dimensions of the plate-shaped inverted L-shaped antenna 110, the circuit board 12 and the plate-shaped antenna 14 and the distance from each other are adjusted to predetermined values, and the plate-shaped inverted L-shaped antenna 110 is adjusted.
- Self-impedance, self-impedance of plate antenna 14 and inverted plate L are adjusted.
- the size of the antenna for the portable wireless device can be further reduced.
- the width of the feed element may be increased to make it plate-shaped, and then the shape of the feed element may be inverted F-shaped, or the plate-shaped inverted L-shaped antenna may be arranged vertically on the circuit board. it can.
- a portable wireless device can be reduced in size and thickness while achieving a higher gain and a wider band.
- the present invention can be applied to, for example, an antenna for a portable wireless device such as a mobile phone.
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Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP03733477A EP1453137A4 (en) | 2002-06-25 | 2003-06-18 | ANTENNA FOR PORTABLE RADIO |
AU2003242453A AU2003242453A1 (en) | 2002-06-25 | 2003-06-18 | Antenna for portable radio |
US10/499,904 US20050104783A1 (en) | 2002-06-25 | 2003-06-18 | Antenna for portable radio |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002184003A JP2004032242A (ja) | 2002-06-25 | 2002-06-25 | 携帯無線機用アンテナ |
JP2002-184003 | 2002-06-25 | ||
JP2002282993A JP2004120519A (ja) | 2002-09-27 | 2002-09-27 | 携帯無線機用アンテナ |
JP2002-282993 | 2002-09-27 |
Publications (1)
Publication Number | Publication Date |
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WO2004001895A1 true WO2004001895A1 (ja) | 2003-12-31 |
Family
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PCT/JP2003/007708 WO2004001895A1 (ja) | 2002-06-25 | 2003-06-18 | 携帯無線機用アンテナ |
Country Status (5)
Country | Link |
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US (1) | US20050104783A1 (ja) |
EP (1) | EP1453137A4 (ja) |
CN (1) | CN1653645A (ja) |
AU (1) | AU2003242453A1 (ja) |
WO (1) | WO2004001895A1 (ja) |
Cited By (1)
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CN110808446B (zh) * | 2019-12-02 | 2023-07-28 | 西南交通大学 | 一种板状天线折叠支架 |
CN111952724B (zh) * | 2020-09-28 | 2022-11-08 | 西安电子科技大学 | 天线模组及电子设备 |
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- 2003-06-18 WO PCT/JP2003/007708 patent/WO2004001895A1/ja not_active Application Discontinuation
- 2003-06-18 AU AU2003242453A patent/AU2003242453A1/en not_active Abandoned
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Also Published As
Publication number | Publication date |
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CN1653645A (zh) | 2005-08-10 |
EP1453137A1 (en) | 2004-09-01 |
EP1453137A4 (en) | 2005-02-02 |
AU2003242453A1 (en) | 2004-01-06 |
US20050104783A1 (en) | 2005-05-19 |
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