WO2014115224A1 - アンテナ装置 - Google Patents
アンテナ装置 Download PDFInfo
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- WO2014115224A1 WO2014115224A1 PCT/JP2013/007445 JP2013007445W WO2014115224A1 WO 2014115224 A1 WO2014115224 A1 WO 2014115224A1 JP 2013007445 W JP2013007445 W JP 2013007445W WO 2014115224 A1 WO2014115224 A1 WO 2014115224A1
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- Prior art keywords
- feed element
- antenna
- feed
- parasitic
- connection point
- Prior art date
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/0006—Particular feeding systems
- H01Q21/0075—Stripline fed arrays
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/24—Combinations of antenna units polarised in different directions for transmitting or receiving circularly and elliptically polarised waves or waves linearly polarised in any direction
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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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
- H01Q1/521—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure reducing the coupling between adjacent antennas
- H01Q1/523—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure reducing the coupling between adjacent antennas between antennas of an array
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/28—Combinations of substantially independent non-interacting antenna units or systems
-
- 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 disclosure relates to an antenna device, a wireless communication device including the antenna device, and an electronic device including the wireless communication device.
- a wireless communication device for receiving a broadcast signal such as terrestrial digital television broadcasting and a display device for displaying the content of the received broadcast signal are in widespread use.
- Various shapes and arrangements have been proposed for the antenna of a wireless communication device (see, for example, Patent Document 1).
- the antenna of the wireless communication device can approach other metal parts in the electronic device due to the limited size of the housing of the electronic device There is sex. At this time, current in the reverse direction to the current flowing to the antenna flows to the metal component, which may lower the gain of the antenna. Also, capacitance may occur between the antenna and the metal component, which may reduce the bandwidth of the antenna.
- a plurality of antennas are provided inside or outside the casing of the electronic device, and adaptive control such as combining diversity scheme is performed to combine received signals received by the plurality of antennas in phase.
- adaptive control such as combining diversity scheme is performed to combine received signals received by the plurality of antennas in phase.
- the problems of antenna gain reduction and bandwidth reduction may be more pronounced than with one antenna.
- the present disclosure provides an antenna apparatus that is effective to mitigate gain reduction and bandwidth reduction. Further, the present disclosure provides a wireless communication device including the antenna device and an electronic device including the wireless communication device.
- the antenna device is In an antenna device comprising at least one antenna and a ground conductor plate, Each of the at least one antenna A dielectric substrate having a first surface and a second surface; A strip-shaped first feed element formed on a first surface of a dielectric substrate, the first feed element having a first end connected to a feed point and an open second end.
- the first feed element and the parasitic element are disposed opposite each other at least in part, including the second end of the first feed element and the second end of the parasitic element.
- the antenna device, the wireless communication device, and the electronic device according to the present disclosure are effective to mitigate the decrease in gain and the decrease in bandwidth of the antenna device.
- FIG. 1 is a perspective view showing an electronic device 100 according to a first embodiment. It is a disassembled perspective view of the electronic device 100 of FIG.
- FIG. 2 is a cross-sectional view of the electronic device 100 cut along a line AA of FIG. It is the top view which looked at the antenna apparatus 107 of FIG. 2 from the front side. It is the top view which looked at the antenna apparatus 107 of FIG. 2 from the back surface side.
- It is a radiation pattern figure of the electromagnetic wave of the vertical polarization of the antenna 1 of FIG. It is a radiation pattern figure of the electromagnetic wave of the vertical polarization of the antenna 2 of FIG. It is a radiation pattern figure of the electromagnetic wave of the vertically polarized wave of the antenna 3 of FIG.
- antenna 1A of FIG. It is an enlarged view of antenna 1A of FIG. It is the top view which looked at antenna device 107B concerning a modification of a 2nd embodiment from the back side. It is a graph which shows the frequency characteristic of the average gain of antenna 1A, 2A, 3A, 4 of FIG.15 and FIG.16.
- FIG. 1 is a perspective view showing an electronic device 100 according to the first embodiment.
- FIG. 2 is an exploded perspective view of the electronic device 100 of FIG.
- FIG. 3 is a cross-sectional view of the electronic device 100 taken along the line AA of FIG.
- XYZ coordinates shown in the drawing.
- the + Z side of the electronic device 100 is called “front side”
- the ⁇ Z side of the electronic device 100 is called “back side”.
- a wavelength corresponding to the frequency f included in the operation band of the electronic device 100 is assumed to be ⁇ .
- the electronic device 100 is configured by housing a television receiver 106 in an external housing including the front panel 101 and the back cover 105.
- the television receiver 106 includes a liquid crystal display (LCD) 102, a main circuit board 103, and an antenna device 107.
- the antenna device 107 includes antennas 1 to 4 formed on the dielectric substrates 10, 20, and 30, respectively, and a ground conductor plate 104.
- the ground conductor plate 104 is, for example, a plate-like conductor component of the electronic device 100.
- the ground conductor plate 104 has, for example, the same size as the liquid crystal display 102, and has, for example, a rectangular shape having a length ⁇ / 2 in the X direction and a length ⁇ / 4 in the Y direction.
- the ground conductor plate 104 is disposed, for example, at a position parallel to and close to the liquid crystal display 102.
- the back cover 105 may be configured by chamfering the edges on the + X side, the ⁇ X side, the + Y side, and the ⁇ Y side of the rear surface (see FIGS. 2 and 3).
- the dielectric substrates 10, 20, 30 may be disposed at the chamfered positions of the back cover 105. As shown in FIG. 2, for example, dielectric substrate 10 is disposed at the chamfered portion on the + X side of back cover 105, and dielectric substrates 20 and 30 are disposed at the chamfered portion on the + Y side of back cover 105. May be
- the electronic device 100 of FIG. 1 is, for example, a portable device for receiving a broadcast signal in the frequency band (473 MHz to 767 MHz) of digital terrestrial television broadcasting and displaying the content thereof.
- the main circuit board 103 includes a circuit that controls the overall operation of the electronic device 100.
- main circuit board 103 is, for example, a printed wiring board, and includes a power supply circuit for supplying a power supply voltage to each circuit on main circuit board 103, a wireless reception circuit (tuner), and an LCD drive circuit.
- the wireless reception circuit is connected to antennas 1 to 4 respectively, and performs polarization diversity processing on four received signals received by antennas 1 to 4 (that is, each of them is selected according to the signal-to-noise ratio). Weighting received signals) and combining them into one received signal.
- the wireless reception circuit outputs a video signal and an audio signal included in the combined reception signal.
- the LCD drive circuit performs predetermined image processing on the video signal from the wireless reception circuit to drive the liquid crystal display 102 to display an image.
- the electronic device 100 includes an audio processing circuit that performs predetermined processing on an audio signal from the wireless reception circuit, a speaker that outputs the processed audio signal, a recording device and a reproduction device for the video signal and the audio signal, And components, such as a metal member for heat dissipation for reducing heat generated from components, such as main circuit board 103 mentioned above, are provided (not shown).
- the antenna device 107 provided with the antennas 1 to 4 and the wireless receiving circuit on the main circuit board 103 constitute a wireless communication device for receiving a wireless signal.
- FIG. 4 is a plan view of the antenna device 107 of FIG. 2 as viewed from the front side.
- FIG. 5 is a plan view of the antenna device 107 of FIG. 2 as viewed from the rear side.
- the antenna device 107 faces the main circuit board 103 on the front surface and faces the back cover 105 on the rear surface.
- the antenna 1 includes a dielectric substrate 10, a strip-shaped feeding element 11 formed on the front surface (FIG. 4) of the dielectric substrate 10, and a strip-shaped non-formed on the back surface (FIG. 5) of the dielectric substrate 10. And a feed element 12.
- the feed element 11 and the parasitic element 12 are made of a conductive foil such as copper or silver.
- the dielectric substrate 10, the feed element 11, and the non-feed element 12 are configured as, for example, printed wiring boards having conductor layers on both sides.
- feed element 11 includes element portions 11 a and 11 b connected to each other at connection point 11 c.
- Element portion 11a extends substantially in the + X direction from a position close to ground conductor plate 104, connected at one end to feed point 13, and at the other end connected to element portion 11b at connection point 11c.
- the element portion 11b extends substantially in the -Y direction from the connection point 11c, is open at the open end 11d at one end, and is connected to the element portion 11a at the other end connection point 11c.
- parasitic element 12 includes element portions 12a and 12b connected to each other at connection point 12c.
- Element portion 12a extends substantially in the + X direction from a position close to ground conductor plate 104, and is connected to connection conductor 14 at connection point 14a at one end, and ground conductor plate 104 via connection conductor 14
- the other end connection point 12c is connected to the element portion 12b.
- the element portion 12b extends substantially in the -Y direction from the connection point 12c, is open at the open end 12d at one end, and is connected to the element portion 12a at the other end connection point 12c.
- the feed element 11 has the end (first end) connected to the feed point 13 and the open end 11 d (second end).
- the parasitic element 12 has an end (first end) connected to the ground conductor plate 104 and an open end 12 d (second end).
- the feed element 11 and the parasitic element 12 are disposed to face each other at least in part including the open end 11 d of the feed element 11 and the open end 12 d of the parasitic element 12.
- the feed element 11 and the parasitic element 12 may be arranged to be capacitively coupled to each other at least at a part including the open end 11 d of the feed element 11 and the open end 12 d of the parasitic element 12.
- the antenna 1 includes the feed element 11 and the parasitic element 12 by capacitive coupling between the open end 11 d of the feed element 11 and the open end 12 d of the parasitic element 12, and is folded back at the open ends 11 d and 12 d. Operate as a folded antenna.
- the electrical length L10 of the feed element 11 and the parasitic element 12 capacitively coupled to each other is set to ⁇ / 4, therefore, the electrical length of the return antenna is set to ⁇ / 2, and the return antenna resonates at the frequency f.
- the feeding element 11 and the parasitic element 12 resonate at a frequency f corresponding to the wavelength ⁇ determined by the sum of the electrical length L10 of the feeding element 11 and the electrical length L10 of the parasitic element 12.
- the feed element 11 and the parasitic element 12 may be arranged to overlap each other at least in part, including the open end 11 d of the feed element 11 and the open end 12 d of the parasitic element 12.
- the antenna 2 includes a dielectric substrate 10, a strip-shaped feeding element 21 formed on the front surface (FIG. 4) of the dielectric substrate 10, and a non-strip shape formed on the back surface (FIG. 5) of the dielectric substrate 10. And a feed element 22.
- the feed element 21 and the parasitic element 22 are made of a conductive foil such as copper or silver.
- the dielectric substrate 10, the feed element 21, and the non-feed element 22 are configured, for example, as a printed wiring board having conductor layers on both sides.
- feed element 21 includes element portions 21a and 21b connected to each other at connection point 21c.
- Element portion 21a extends substantially in the + Y direction from a position close to ground conductor plate 104, connected at one end to feed point 23, and at the other end connected to element portion 21b at connection point 21c.
- the element portion 21b extends substantially in the ⁇ X direction from the connection point 21c, is open at the open end 21d at one end thereof, and is connected to the element portion 21a at the connection point 21c at the other end.
- parasitic element 22 includes element portions 22a and 22b connected to each other at connection point 22c.
- Element portion 22a extends substantially in the + Y direction from a position close to ground conductor plate 104, and is connected to connection conductor 24 at connection point 24a at one end, and ground conductor plate 104 via connection conductor 24.
- the element portion 22b extends substantially in the ⁇ X direction from the connection point 22c, is open at the open end 22d at one end thereof, and is connected to the element portion 22a at the other end connection point 22c.
- the feeding element 21 has the end (first end) connected to the feeding point 23 and the open end 21 d (second end).
- the parasitic element 22 has an end (first end) connected to the ground conductor plate 104 and an open end 22 d (second end).
- the feed element 21 and the parasitic element 22 are disposed to face each other at least in part including the open end 21 d of the feed element 21 and the open end 22 d of the parasitic element 22.
- the feed element 21 and the parasitic element 22 may be arranged to be capacitively coupled to each other at least at a part including the open end 21 d of the feed element 21 and the open end 22 d of the parasitic element 22.
- the antenna 2 when the open end 21d of the feed element 21 and the open end 22d of the parasitic element 22 capacitively couple, the antenna 2 includes the feed element 21 and the parasitic element 22 and is folded back at the open ends 21d and 22d. Operate as a folded antenna.
- the electrical length L20 of the feed element 21 and the parasitic element 22 capacitively coupled to each other is set to ⁇ / 4, so the electrical length of the return antenna is set to ⁇ / 2, and the return antenna resonates at the frequency f.
- the feed element 21 and the parasitic element 22 resonate at a frequency f corresponding to the wavelength ⁇ determined by the sum of the electrical length L20 of the feed element 21 and the electrical length L20 of the parasitic element 22.
- the feed element 21 and the parasitic element 22 may be arranged to overlap each other at least in part, including the open end 21 d of the feed element 21 and the open end 22 d of the parasitic element 22.
- the antenna 3 includes a dielectric substrate 10, a strip-shaped feeding element 31 formed on the front surface (FIG. 4) of the dielectric substrate 10, and a non-strip shape formed on the back surface (FIG. 5) of the dielectric substrate 10. And a feed element 32.
- the feed element 31 and the parasitic element 32 are made of a conductive foil such as copper or silver.
- the dielectric substrate 10, the feed element 31, and the non-feed element 32 are configured as, for example, printed wiring boards having conductor layers on both sides.
- feed element 31 includes element portions 31a and 31b connected to each other at connection point 31c.
- Element portion 31a extends substantially in the + Y direction from a position close to ground conductor plate 104, connected at one end to feeding point 33, and connected at the other end to element portion 31b at connection point 31c.
- the element portion 31b extends substantially in the + X direction from the connection point 31c, is open at the open end 31d at one end, and is connected to the element portion 31a at the other end connection point 31c.
- parasitic element 32 includes element portions 32a and 32b connected to each other at connection point 32c.
- Element portion 32a extends substantially in the + Y direction from a position close to ground conductor plate 104, and is connected to connection conductor 34 at connection point 34a at one end thereof, and ground conductor plate 104 via connection conductor 34.
- the other end connection point 32c is connected to the element portion 32b.
- the element portion 32b extends substantially in the + X direction from the connection point 32c, is open at the open end 32d at one end thereof, and is connected to the element portion 32a at the other end connection point 32c.
- the feed element 31 has an end (first end) connected to the feed point 33 and an open end 31 d (second end).
- the parasitic element 32 has an end (first end) connected to the ground conductor plate 104 and an open end 32 d (second end).
- the feed element 31 and the parasitic element 32 are disposed to face each other at least in part including the open end 31 d of the feed element 31 and the open end 32 d of the parasitic element 32.
- the feed element 31 and the parasitic element 32 may be arranged to be capacitively coupled to each other at least at a part including the open end 31 d of the feed element 31 and the open end 32 d of the parasitic element 32.
- the antenna 3 includes the feed element 31 and the parasitic element 32 by capacitive coupling between the open end 31 d of the feed element 31 and the open end 32 d of the parasitic element 32, and is folded back at the open ends 31 d and 32 d. Operate as a folded antenna.
- the electrical length L30 of the feed element 31 and the parasitic element 32 capacitively coupled to each other is set to ⁇ / 4, therefore, the electrical length of the return antenna is set to ⁇ / 2, and the return antenna resonates at the frequency f.
- the feed element 31 and the parasitic element 32 resonate at a frequency f corresponding to the wavelength ⁇ determined by the sum of the electrical length L30 of the feed element 31 and the electrical length L30 of the parasitic element 32.
- the feed element 31 and the parasitic element 32 may be arranged to overlap each other in at least a part including the open end 31 d of the feed element 31 and the open end 32 d of the parasitic element 32.
- the antenna 4 is a monopole antenna provided with a feed element 41 in the form of a strip, and is connected to the feed point 43.
- the feed element 41 may protrude from the housing of the electronic device 100 in the ⁇ X direction or another direction.
- the electrical length L40 of the feed element 41 is set to ⁇ / 4, and the antenna 4 resonates at the frequency f.
- the antenna device 107 includes the feeding points 13, 23, 33, and 43, and the antennas 1 to 4 connected to the respective feeding points.
- the antennas 1 to 4 are respectively connected to the wireless receiving circuit of the main circuit board 103 via a feed line having an impedance of, for example, 50 ohms.
- the wireless reception circuit uses antennas 1 to 4 to receive a wireless signal having a frequency f.
- At least one of the antennas 1 to 4 may have a polarization direction different from that of the other antennas.
- the antennas 1 to 4 are provided as follows.
- the antenna 1 is provided close to the + X side of the ground conductor plate 104, and the feeding point 13 is provided close to the + X side and the + Y side corner of the ground conductor plate 104.
- the antenna 2 is provided close to the + Y side of the ground conductor plate 104, and the feeding point 23 is provided close to the + X side and + Y side corner of the ground conductor plate 104.
- the antenna 3 is provided close to the + Y side of the ground conductor plate 104, and the feeding point 33 is provided close to the corner on the ⁇ X side and + Y side of the ground conductor plate 104.
- the antenna 4 is provided close to a corner on the ⁇ X side and the + Y side of the ground conductor plate 104, and the feeding point 43 is provided close to a corner on the ⁇ X side and the + Y side of the ground conductor plate 104.
- the antenna 1 receives radio waves of vertical polarization having a polarization direction parallel to the X axis.
- the antenna 2 receives vertically polarized radio waves having a polarization direction parallel to the Y axis.
- the antenna 3 receives radio waves of vertical polarization having a polarization direction parallel to the Y axis.
- the antenna 4 receives horizontally polarized radio waves.
- antennas 1 to 4 are configured such that the resonant frequencies of antennas 1 to 4 are the same.
- the antennas 1 to 3 may have dimensions different from one another in order to realize the same resonant frequency while considering the influence from other parts of the electronic device 100.
- FIG. 6 is a radiation pattern diagram of vertically polarized radio waves of the antenna 1 of FIG.
- FIG. 7 is a radiation pattern diagram of vertically polarized radio waves of the antenna 2 of FIG.
- FIG. 8 is a radiation pattern diagram of vertically polarized radio waves of the antenna 3 of FIG.
- FIG. 9 is a radiation pattern diagram of vertically polarized radio waves of the antenna 4 of FIG.
- FIG. 10 is a radiation pattern diagram of horizontally polarized radio waves of the antenna 1 of FIG.
- FIG. 11 is a radiation pattern diagram of horizontally polarized radio waves of the antenna 2 of FIG.
- FIG. 12 is a radiation pattern diagram of horizontally polarized radio waves of the antenna 3 of FIG.
- FIG. 13 is a radiation pattern diagram of horizontally polarized radio waves of the antenna 4 of FIG.
- the antennas 1 to 4 are substantially omnidirectional for vertically polarized radio waves over the entire frequency band of digital terrestrial television broadcasting.
- FIG. 14 is a graph showing the frequency characteristics of the average gain of the antennas 1 to 4 of FIG.
- the vertical axis of the graph shows the average gain when cross polarization is ⁇ 6 dB (horizontal polarization gain + (vertical polarization gain ⁇ 6)).
- the average value of the average gain of each of the antennas 1 to 4 was ⁇ 7.9 dBd or more at each frequency of digital terrestrial television broadcasting.
- the antenna device 107 includes the antennas 1 to 4 and the ground conductor plate 104, and the antennas 1 to 3 have the following configurations.
- the antenna 1 includes a dielectric substrate 10, a strip-shaped feed element 11 formed on the front surface of the dielectric substrate 10, and a strip-shaped non-feed element 12 formed on the rear surface of the dielectric substrate 10.
- the feed element 11 has an end (first end) connected to the feed point 13 and an open end 11 d (second end).
- the parasitic element 12 has an end (first end) connected to the ground conductor plate 104 and an open end 12 d (second end).
- the feed element 11 and the parasitic element 12 are disposed to face each other at least in part including the open end 11 d of the feed element 11 and the open end 12 d of the parasitic element 12.
- the feed element 11 and the parasitic element 12 may be arranged to be capacitively coupled to each other at least at a part including the open end 11 d of the feed element 11 and the open end 12 d of the parasitic element 12.
- the feeding element 11 and the parasitic element 12 resonate at a frequency f corresponding to a wavelength ⁇ determined by the sum of the electrical length L10 of the feeding element 11 and the electrical length L10 of the parasitic element 12.
- the antenna 2 includes a dielectric substrate 20, a strip-shaped feed element 21 formed on the front surface of the dielectric substrate 20, and a strip-shaped non-feed element 22 formed on the rear surface of the dielectric substrate 20.
- the feed element 21 has an end (first end) connected to the feed point 23 and an open end 21 d (second end).
- the parasitic element 22 has an end (first end) connected to the ground conductor plate 104 and an open end 22 d (second end).
- the feed element 21 and the parasitic element 22 are disposed to face each other at least in part including the open end 21 d of the feed element 21 and the open end 22 d of the parasitic element 22.
- the feed element 21 and the parasitic element 22 may be arranged to be capacitively coupled to each other at least at a part including the open end 21 d of the feed element 21 and the open end 22 d of the parasitic element 22.
- the feeding element 21 and the parasitic element 22 resonate at a frequency f corresponding to the wavelength ⁇ determined by the sum of the electrical length L20 of the feeding element 21 and the electrical length L20 of the parasitic element 22.
- the antenna 3 includes a dielectric substrate 30, a strip-shaped feed element 31 formed on the front surface of the dielectric substrate 30, and a strip-shaped non-feed element 32 formed on the rear surface of the dielectric substrate 30.
- the feed element 31 has an end (first end) connected to the feed point 33 and an open end 31 d (second end).
- the parasitic element 32 has an end (first end) connected to the ground conductor plate 104 and an open end 32 d (second end).
- the feed element 31 and the parasitic element 32 are disposed to face each other at least in part including the open end 31 d of the feed element 31 and the open end 32 d of the parasitic element 32.
- the feed element 31 and the parasitic element 32 may be arranged to be capacitively coupled to each other at least at a part including the open end 31 d of the feed element 31 and the open end 32 d of the parasitic element 32.
- the feed element 31 and the parasitic element 32 resonate at a frequency f corresponding to the wavelength ⁇ determined by the sum of the electrical length L30 of the feed element 31 and the electrical length L30 of the parasitic element 32.
- the antennas 1 to 3 realize a wide band by utilizing capacitive coupling between the feed element and the parasitic element and the resonance of the ground conductor plate 104 caused by the flow of current through the ground conductor plate 104. can do.
- an inverted L-shaped folded antenna using parallel resonance between the feed element and the non-feed element as the antennas 1 to 3 it is possible to mitigate the decrease in gain and the decrease in bandwidth.
- the antenna 1 When the antennas 1 and 2 are provided adjacent to each other as shown in FIGS. 4 and 5, the antenna 1 receives horizontally polarized radio waves, while the antenna 2 receives vertically polarized radio waves. Therefore, the direction of the ground current resulting from the receiving operation of the antenna 1 and the direction of the ground current resulting from the receiving operation of the antenna 2 are orthogonal to each other. As a result, the isolation between the antennas 1 and 2 can be increased, and therefore, the decrease in gain can be substantially prevented.
- the distance between the feeding point 23 of the antenna 2 and the feeding point 33 of the antenna 3 is set to ⁇ / 4 or more, when the ground current resulting from the receiving operation of the antenna 2 flows, The ground current resulting from the reception operation does not flow. As a result, the isolation between the antennas 2 and 3 can be increased, thus substantially preventing a decrease in gain.
- the antenna 3 receives vertically polarized radio waves, while the antenna 4 receives horizontally polarized radio waves. Therefore, the isolation between the antennas 3 and 4 can be increased as compared to the case where the antennas 3 and 4 receive radio waves having the same polarization direction, thus substantially preventing a gain reduction. it can.
- the antennas 1 to 4 can be provided in the vicinity of the ground conductor plate 104, so that the electronic device 100 can be miniaturized.
- the electronic device 100 since there is no need to provide a housing for housing the antenna device including the antennas 1 to 4 in addition to the housing of the electronic device 100 itself, it is possible to provide the electronic device 100 which is inexpensive and excellent in water resistance. Can.
- the antennas 1 to 3 can be disposed on the chamfered portion of the back cover 105, the thinness of the appearance of the electronic device 100 can be emphasized, and the housing structure can be reinforced.
- the second embodiment will be described below with reference to FIGS. 15 to 19.
- the electronic device 100 according to the second embodiment includes an antenna device 100A shown in FIG. 15 and FIG. 16 instead of the antenna device 107 in FIG.
- the antenna device 107A includes the antennas 1A, 2A, 3A, 4 formed on the dielectric substrates 10, 20, 30, respectively, and the ground conductor plate 104.
- a first wavelength corresponding to the first frequency f1 included in the operating band of the electronic device 100 is ⁇ 1
- a second wavelength corresponding to the second frequency f2 included in the operating band is ⁇ 2.
- the other configuration of the electronic device 100 according to the second embodiment is the same as that of the first embodiment, and thus the description thereof is omitted.
- FIG. 15 is a plan view of the antenna device 107A according to the second embodiment as viewed from the front side.
- FIG. 16 is a plan view of the antenna device 107A of FIG. 15 as viewed from the rear side.
- the antenna 1A will be described.
- the antenna 1 ⁇ / b> A includes the dielectric substrate 10, the feeding element (first feeding element) 11, and the non-feeding element 12 as in the antenna 1 of the first embodiment.
- the antenna 1A further includes a strip-shaped second feeding element 15 formed on the front surface (FIG. 15) of the dielectric substrate.
- the feed element 15 is made of a conductor foil such as copper or silver.
- the dielectric substrate 10, the feeding elements 11 and 15, and the non-feeding element 12 are configured as, for example, printed wiring boards having conductor layers on both sides.
- the feed element 15 has a first end and a second end connected respectively to connection points 11 e and 11 f at different positions on the feed element 11.
- feed element 15 includes element portions 15a and 15b connected to each other at connection point 15c.
- the element portion 15a extends substantially in the -Y direction from the element portion 11a of the feed element 11, and is connected to the element portion 11a of the feed element 11 at a connection point 11e at one end thereof and a connection point 15c at the other end Are connected to the element portion 15b.
- the element portion 15b extends substantially in the + X direction from the connection point 15c, is connected to the element portion 11b of the feed element 11 at the connection point 11f at one end thereof, and is connected to the element portion 15a at the other end connection point 15c. It is connected.
- Feeding element 15 is arranged to be capacitively coupled to feeding element 11 at least at a part between the first end (connection point 11 e) and the second end (connection point 11 f) of feeding element 15. .
- FIG. 17 is an enlarged view of the antenna 1A of FIG.
- the feed elements 11 and 15 are arranged parallel to each other with a distance L0 (for example, a distance about the width of the feed elements 11 and 15 itself), so that a virtual capacitor C1 is generated therebetween.
- L0 for example, a distance about the width of the feed elements 11 and 15 itself
- the antenna 1A When the open end 11d of the feed element 11 and the open end 12d of the parasitic element 12 capacitively couple, the antenna 1A includes the feed element 11 and the parasitic element 12, and the first folded back at the open ends 11d and 12d. Operate as an antenna.
- the electrical length L11 of the feed element 11 and the parasitic element 12 capacitively coupled to each other is set to ⁇ 1 / 4, so that the electrical length of the first return antenna is set to ⁇ 1 / 2, and the first return antenna has a frequency of Resonate at f1.
- the feed element 11 and the parasitic element 12 resonate at the first frequency f1 corresponding to the first wavelength ⁇ 1 determined by the sum of the electrical length L11 of the feed element 11 and the electrical length L11 of the parasitic element 12 .
- the antenna 1 A further includes a portion from the feed point 13 of the feed element 11 to the connection point 11 e, the feed element 15, and the feed element 11.
- a portion from the connection point 11f to the open end 11d and the parasitic element 12 operate as a second folded antenna folded back at the open ends 11d and 12d.
- the electric length L12 of the portion from the feeding point 13 to the connection point 11e of the feeding element 11, the feeding element 15 and the portion from the connection point 11f of the feeding element 11 to the open end 11d when capacitively coupled to the parasitic element 12 is It is set to ⁇ 2 / 4.
- the electrical length L12 of the parasitic element 12 when capacitively coupled to the feeding elements 11 and 15 is set to ⁇ 2 / 4. Therefore, the electrical length of the second folded antenna is set to ⁇ 2 / 2, and the second folded antenna resonates at the frequency f2.
- the feed element 11, the feed element 15, and the non-feed element 12 correspond to the second wavelength ⁇ 2 determined by the sum of the electric length L12 of the feed elements 11 and 15 and the electric length L12 of the non-feed element 12. It resonates at the second frequency f2.
- the feed element 15 and the parasitic element 12 may be disposed to face each other at least in part. Also, the feed element 15 and the parasitic element 12 may be arranged to be capacitively coupled to each other at least in part. Also, the feed element 15 and the parasitic element 12 may be arranged to overlap each other at least in part.
- the antenna 2A includes a dielectric substrate 20, a feeding element (first feeding element) 21, and a non-feeding element 22 as in the antenna 2 of the first embodiment.
- the antenna 2A further includes a strip-shaped second feeding element 25 formed on the front surface (FIG. 15) of the dielectric substrate 20.
- the feed element 25 is made of a conductor foil such as copper or silver.
- the dielectric substrate 20, the feed elements 21 and 25, and the parasitic element 22 are configured as, for example, printed wiring boards having conductor layers on both sides.
- feed element 25 has first and second ends connected respectively to connection points 21 e and 21 f at different positions on the feed element 21.
- feed element 25 includes element portions 25a and 25b connected to each other at connection point 25c.
- the element portion 25a extends substantially in the -X direction from the element portion 21a of the feed element 21, and is connected to the element portion 21a of the feed element 21 at the connection point 21e at one end thereof and the connection point 25c at the other end Are connected to the element portion 25b.
- the element portion 25b extends substantially in the + Y direction from the connection point 25c, is connected to the element portion 21b of the feed element 21 at the connection point 21f at one end thereof, and is connected to the element portion 25a at the other end connection point 25c. It is connected.
- Feeding element 25 is arranged to be capacitively coupled to feeding element 21 at least at a part between the first end (connection point 21 e) and the second end (connection point 21 f) of feeding element 25. .
- the feed elements 21 and 25 are arranged in parallel with each other with a predetermined distance (for example, a distance about the width of the feed elements 21 and 25 themselves), so that virtual capacitors are generated between them.
- a predetermined distance for example, a distance about the width of the feed elements 21 and 25 themselves
- the antenna 2A When the open end 21d of the feed element 21 and the open end 22d of the parasitic element 22 perform capacitive coupling, the antenna 2A includes the feed element 21 and the parasitic element 22, and is folded back at the open ends 21d and 22d. Operate as an antenna.
- the electrical length L21 of the feed element 21 and the parasitic element 22 capacitively coupled to each other is set to ⁇ 1 / 4, so that the electrical length of the first return antenna is set to ⁇ 1 / 2, and the first return antenna has a frequency of Resonate at f1.
- the feed element 21 and the parasitic element 22 resonate at the first frequency f1 corresponding to the first wavelength ⁇ 1 determined by the sum of the electric length L21 of the feed element 21 and the electric length L21 of the parasitic element 22. .
- the antenna 2A further includes a portion from the feed point 23 of the feed element 21 to the connection point 21e, the feed element 25, and the feed element 21.
- the connection point 21f to the open end 21d and the parasitic element 22 operates as a second folded antenna folded back at the open ends 21d and 22d.
- the electric length L22 of the portion from the feeding point 23 to the connection point 21e of the feeding element 21, the feeding element 25 and the portion from the connection point 21f of the feeding element 21 to the open end 21d when capacitively coupled to the parasitic element 22 is It is set to ⁇ 2 / 4.
- the electrical length L22 of the parasitic element 22 when capacitively coupled to the feeding elements 21 and 25 is set to ⁇ 2 / 4. Therefore, the electrical length of the second folded antenna is set to ⁇ 2 / 2, and the second folded antenna resonates at the frequency f2.
- the feed element 21, the feed element 25, and the parasitic element 22 correspond to the second wavelength ⁇ 2 determined by the sum of the electric lengths L22 of the feeding elements 21 and 25 and the electric length L22 of the parasitic element 22. It resonates at the second frequency f2.
- the feed element 25 and the parasitic element 22 may be disposed to face each other at least in part. Also, the feed element 25 and the parasitic element 22 may be arranged to be capacitively coupled to each other at least in part. Also, the feed element 25 and the parasitic element 22 may be arranged to overlap each other at least in part.
- the antenna 3 ⁇ / b> A includes a dielectric substrate 30, a feeding element (first feeding element) 31, and a non-feeding element 32 as in the antenna 3 of the first embodiment.
- the antenna 3A further includes a strip-shaped second feeding element 35 formed on the front surface (FIG. 15) of the dielectric substrate 30.
- the feed element 35 is made of a conductor foil such as copper or silver.
- the dielectric substrate 30, the feed elements 31, 35, and the non-feed element 32 are configured as, for example, printed wiring boards having conductor layers on both sides.
- feed element 35 has first and second ends connected respectively to connection points 31 e and 31 f at different positions on the feed element 31.
- feed element 35 includes element portions 35a and 35b connected to each other at connection point 35c.
- the element portion 35a extends substantially in the + X direction from the element portion 31a of the feed element 31, and is connected to the element portion 31a of the feed element 31 at a connection point 31e at one end thereof and at a connection point 35c at the other end It is connected to the element portion 35b.
- the element portion 35b extends substantially in the + Y direction from the connection point 35c, is connected to the element portion 31b of the feed element 31 at the connection point 31f at one end thereof, and is connected to the element portion 35a at the other end connection point 35c. It is connected.
- Feeding element 35 is arranged to be capacitively coupled to feeding element 31 at least in part between the first end (connection point 31e) and the second end (connection point 31f) of feeding element 35. .
- the feed elements 31 and 35 are arranged in parallel with each other with a predetermined distance (for example, a distance about the width of the feed elements 31 and 35 themselves), so that virtual capacitors are generated therebetween.
- a predetermined distance for example, a distance about the width of the feed elements 31 and 35 themselves
- the antenna 3A When the open end 31d of the feed element 31 and the open end 32d of the parasitic element 32 capacitively couple, the antenna 3A includes the feed element 31 and the parasitic element 32, and the first folded back at the open ends 31d and 32d. Operate as an antenna.
- the electrical length L31 of the feed element 31 and the parasitic element 32 capacitively coupled to each other is set to ⁇ 1 / 4, so that the electrical length of the first return antenna is set to ⁇ 1 / 2, and the first return antenna has a frequency of Resonate at f1.
- the feed element 31 and the parasitic element 32 resonate at the first frequency f1 corresponding to the first wavelength ⁇ 1 determined by the sum of the electric length L31 of the feed element 31 and the electric length L31 of the parasitic element 32. .
- the antenna 3 A further includes a portion from the feed point 33 of the feed element 31 to the connection point 31 e, the feed element 35, and the feed element 31.
- the connection point 31f to the open end 31d, and the parasitic element 32 and operates as a second folded antenna folded back at the open ends 31d and 32d.
- the electric length L32 of the portion from the feeding point 33 to the connection point 31e of the feeding element 31, the feeding element 35, and the portion from the connection point 31f of the feeding element 31 to the open end 31d when capacitively coupled to the parasitic element 32 is It is set to ⁇ 2 / 4.
- the electrical length L32 of the parasitic element 32 when capacitively coupled to the feeding elements 31 and 35 is set to ⁇ 2 / 4. Therefore, the electrical length of the second folded antenna is set to ⁇ 2 / 2, and the second folded antenna resonates at the frequency f2.
- the feed element 31, the feed element 35, and the parasitic element 32 correspond to the second wavelength ⁇ 2 determined by the sum of the electric lengths L32 of the feed elements 31 and 35 and the electric length L32 of the parasitic element 32. It resonates at the second frequency f2.
- the feed element 35 and the parasitic element 32 may be disposed to face each other at least in part. Also, the feed element 35 and the parasitic element 32 may be arranged to be capacitively coupled to each other at least in part. Also, the feed element 35 and the parasitic element 32 may be arranged to overlap each other at least in part.
- the antenna 4 is configured in the same manner as the antenna 4 of the first embodiment.
- the wireless receiving circuit of the main circuit board 103 receives wireless signals having frequencies f1 and f2 using the antennas 1A, 1B, and 1C.
- FIG. 18 is a plan view of an antenna device 107B according to a modification of the second embodiment as viewed from the rear surface side.
- the parasitic elements of the antennas 1A, 2A, 3A had a shape different from that of the feeding element (FIG. 15) (that is, the same shape as the parasitic elements of the antennas 1 to 3 in FIG. 5).
- the parasitic element may have the same shape as that of the feeding element (FIG. 15).
- the antenna device 107B includes the antennas 1B, 2B, 3B and 4 formed on the dielectric substrates 10, 20 and 30, respectively, and the ground conductor plate 104.
- the front surfaces of the antennas 1B, 2B and 3B are configured in the same manner as the antennas 1A, 2A and 3A of FIG.
- the antenna 1B includes the dielectric substrate 10, the feeding elements 11 and 15, and the non-feeding element (first non-feeding element) 12, similarly to the antenna 1A of FIGS.
- the antenna 1B further includes a strip-shaped second parasitic element 16 formed on the rear surface (FIG. 18) of the dielectric substrate 10.
- the feed element 15 is made of a conductor foil such as copper or silver.
- the dielectric substrate 10, the feeding elements 11 and 15, and the non-feeding elements 12 and 16 are configured as, for example, printed wiring boards having conductor layers on both sides.
- the parasitic element 16 has a first end and a second end connected respectively to connection points 12 e and 12 f at different positions on the parasitic element 12.
- parasitic element 16 includes element portions 16a and 16b connected to each other at connection point 16c.
- the element portion 16a extends substantially in the -Y direction from the element portion 12a of the parasitic element 12, and is connected to the element portion 12a of the parasitic element 12 at a connection point 12e at one end thereof, and is connected at the other end
- the point 16c is connected to the element portion 16b.
- the element portion 16b extends substantially in the + X direction from the connection point 16c, and is connected to the element portion 12b of the parasitic element 12 at the connection point 12f at one end, and the element portion 16a at the connection point 16c at the other end It is connected to the.
- the antenna 1B When the open end 11d of the feed element 11 and the open end 12d of the parasitic element 12 capacitively couple, the antenna 1B includes the feed element 11 and the parasitic element 12, and the first folded back at the open ends 11d and 12d. Operate as an antenna.
- the electrical length L11 of the feed element 11 and the parasitic element 12 capacitively coupled to each other is set to ⁇ 1 / 4, so that the electrical length of the first return antenna is set to ⁇ 1 / 2, and the first return antenna has a frequency of Resonate at f1.
- the feed element 11 and the parasitic element 12 resonate at the first frequency f1 corresponding to the first wavelength ⁇ 1 determined by the sum of the electrical length L11 of the feed element 11 and the electrical length L11 of the parasitic element 12 .
- the antenna 1 B further includes a portion from the feed point 13 of the feed element 11 to the connection point 11 e, the feed element 15, and the feed element 11.
- the electrical length L12 of the portion from the feeding point 13 to the connection point 11e of the feeding element 11, and the portion from the connection point 11f of the feeding element 11 to the open end 11d when capacitive coupling is performed with the parasitic elements 12 and 16. Is set to ⁇ 2 / 4.
- the portion from the connection point 14a of the parasitic element 12 to the connection point 12e when capacitively coupled to the feed elements 11 and 15, the parasitic element 16 and the portion from the connection point 12f of the parasitic element 12 to the open end 12d The electrical length L12 is set to ⁇ 2 / 4. Therefore, the electrical length of the second folded antenna is set to ⁇ 2 / 2, and the second folded antenna resonates at the frequency f2.
- the feed element 11, the feed element 15, the parasitic element 12, and the parasitic element 16 are determined by the sum of the electric length L12 of the feed elements 11 and 15 and the electric length L12 of the parasitic elements 12 and 16. It resonates at the second frequency f2 corresponding to the two wavelengths ⁇ 2.
- the feed elements 11 and 15 and the parasitic element 16 may be disposed to face each other at least in part.
- the feed elements 11 and 15 and the parasitic element 16 may be arranged to be capacitively coupled to each other at least in part.
- the feed elements 11 and 15 and the parasitic element 16 may be arranged to overlap each other at least in part.
- the antenna 2B includes the dielectric substrate 20, the feeding elements 21 and 25, and the non-feeding element (first non-feeding element) 22, similarly to the antenna 2A of FIGS.
- the antenna 2B further includes a strip-shaped second parasitic element 26 formed on the rear surface (FIG. 18) of the dielectric substrate 20.
- the feed element 25 is made of a conductor foil such as copper or silver.
- the dielectric substrate 20, the feed elements 21 and 25, and the non-feed elements 22 and 26 are configured as, for example, printed wiring boards having conductor layers on both sides.
- the parasitic element 26 has first and second ends connected respectively to connection points 22 e and 22 f at different positions on the parasitic element 22.
- parasitic element 26 includes element portions 26a and 26b connected to each other at connection point 26c.
- the element portion 26a extends substantially in the -X direction from the element portion 22a of the parasitic element 22, and is connected to the element portion 22a of the parasitic element 22 at a connection point 22e at one end thereof and is connected at the other end
- the point 26c is connected to the element portion 26b.
- the element portion 26b extends substantially in the + Y direction from the connection point 26c, and is connected to the element portion 22b of the parasitic element 22 at the connection point 22f at one end, and the element portion 26a at the connection point 26c at the other end It is connected to the.
- the antenna 2B When the open end 21d of the feed element 21 and the open end 22d of the parasitic element 22 capacitively couple, the antenna 2B includes the feed element 21 and the parasitic element 22, and the first folded back at the open ends 21d and 22d. Operate as an antenna.
- the electrical length L21 of the feed element 21 and the parasitic element 22 capacitively coupled to each other is set to ⁇ 1 / 4, so that the electrical length of the first return antenna is set to ⁇ 1 / 2, and the first return antenna has a frequency of Resonate at f1.
- the feed element 21 and the parasitic element 22 resonate at the first frequency f1 corresponding to the first wavelength ⁇ 1 determined by the sum of the electric length L21 of the feed element 21 and the electric length L21 of the parasitic element 22. .
- the antenna 2 B further includes a portion from the feed point 23 of the feed element 21 to the connection point 21 e, the feed element 25, and the feed element 21. , From the connection point 21f to the open end 21d, from the connection point 24a to the connection point 22e of the parasitic element 22, from the connection point 22f to the open end 22d from the parasitic element 26, and the parasitic element 22; And operate as a second folded antenna folded back at the open ends 21d and 22d.
- Electric length L22 of a portion from the feeding point 23 of the feeding element 21 to the connection point 21e when capacitive coupling is performed with the parasitic elements 22 and 26, the feeding element 25 and a portion from the connection point 21f of the feeding element 21 to the open end 21d Is set to ⁇ 2 / 4.
- the portion from the connection point 24a of the parasitic element 22 to the connection point 22e when capacitively coupled to the feed elements 21 and 25, the parasitic element 26, and the portion from the connection point 22f of the parasitic element 22 to the open end 22d The electrical length L22 is set to ⁇ 2 / 4. Therefore, the electrical length of the second folded antenna is set to ⁇ 2 / 2, and the second folded antenna resonates at the frequency f2.
- the feed element 21, the feed element 25, the parasitic element 22, and the parasitic element 26 are determined by the sum of the electric length L22 of the feed elements 21 and 25 and the electric length L22 of the parasitic elements 22 and 26. It resonates at the second frequency f2 corresponding to the two wavelengths ⁇ 2.
- the feed elements 21 and 25 and the parasitic elements 22 and 26 may be disposed to face each other at least in part. Also, the feed elements 21 and 25 and the parasitic elements 22 and 26 may be arranged to be capacitively coupled to each other at least in part. Further, the feed elements 21 and 25 and the parasitic elements 22 and 26 may be arranged to overlap each other at least in part.
- the antenna 3B includes the dielectric substrate 30, the feeding elements 31 and 35, and the non-feeding element (first non-feeding element) 32.
- the antenna 3B further includes a strip-shaped second parasitic element 36 formed on the rear surface (FIG. 18) of the dielectric substrate 30.
- the feed element 35 is made of a conductor foil such as copper or silver.
- the dielectric substrate 30, the feed elements 31, 35, and the non-feed elements 32, 36 are configured as, for example, printed wiring boards having conductor layers on both sides.
- parasitic element 36 has first and second ends connected respectively to connection points 32 e and 32 f at different positions on the parasitic element 32.
- parasitic element 36 includes element portions 36a and 36b connected to each other at connection point 36c.
- the element portion 36a extends substantially in the + X direction from the element portion 32a of the parasitic element 32, and is connected to the element portion 32a of the parasitic element 32 at the connection point 32e at one end thereof and the connection point at the other end It is connected to the element portion 36b at 36c.
- the element portion 36b extends substantially in the + Y direction from the connection point 36c, and is connected to the element portion 32b of the parasitic element 32 at the connection point 32f at one end, and at the other end connection point 36c. It is connected to the.
- the antenna 3B When the open end 31d of the feed element 31 and the open end 32d of the parasitic element 32 capacitively couple, the antenna 3B includes the feed element 31 and the parasitic element 32, and the first folded back at the open ends 31d and 32d. Operate as an antenna.
- the electrical length L31 of the feed element 31 and the parasitic element 32 capacitively coupled to each other is set to ⁇ 1 / 4, so that the electrical length of the first return antenna is set to ⁇ 1 / 2, and the first return antenna has a frequency of Resonate at f1.
- the feed element 31 and the parasitic element 32 resonate at the first frequency f1 corresponding to the first wavelength ⁇ 1 determined by the sum of the electric length L31 of the feed element 31 and the electric length L31 of the parasitic element 32. .
- the antenna 3 B further includes a portion from the feed point 33 of the feed element 31 to the connection point 31 e, the feed element 35, and the feed element 31.
- the electrical length L32 of the portion from the feeding point 33 to the connection point 31e of the feeding element 31, and the portion from the connection point 31f of the feeding element 31 to the open end 31d when capacitive coupling is performed with the parasitic elements 32 and 36. Is set to ⁇ 2 / 4.
- the electrical length L32 is set to ⁇ 2 / 4. Therefore, the electrical length of the second folded antenna is set to ⁇ 2 / 2, and the second folded antenna resonates at the frequency f2.
- the feed element 31, the feed element 35, the parasitic element 32, and the parasitic element 36 are determined by the sum of the electric lengths L32 of the feed elements 31 and 35 and the electric lengths L32 of the parasitic elements 32 and 36. It resonates at the second frequency f2 corresponding to the two wavelengths ⁇ 2.
- the feed elements 31 and 35 and the parasitic elements 32 and 36 may be disposed to face each other at least in part.
- the feed elements 31 and 35 and the parasitic elements 32 and 36 may be arranged to be capacitively coupled to each other at least in part.
- the feed elements 31 and 35 and the parasitic elements 32 and 36 may be arranged to overlap each other at least in part.
- FIG. 19 is a graph showing the frequency characteristic of the average gain of the antennas 1A, 2A, 3A, 4 of FIGS.
- the vertical axis of the graph shows the average gain when the cross polarization is -6 dB.
- the average value of the average gain of each antenna 1A, 2A, 3A, 4 was -7.9 dBd or more at each frequency of digital terrestrial television broadcasting.
- the antenna device 107A according to the second embodiment includes the antennas 1A, 2A, 3A, 4 and the ground conductor plate 104, and the antennas 1A, 2A, 3A are the antennas according to the first embodiment.
- the following configuration is provided.
- the antenna 1 ⁇ / b> A includes a strip-shaped feed element 15 formed on the front surface of the dielectric substrate 10.
- the feed element 15 has a first end and a second end connected respectively to connection points 11 e and 11 f at different positions on the feed element 11.
- the feed element 11 and the parasitic element 12 are arranged to be capacitively coupled to each other at least at a part including the open end 11 d of the feed element 11 and the open end 12 d of the parasitic element 12.
- the feed element 11 and the parasitic element 12 resonate at a frequency f1 corresponding to the wavelength ⁇ 1 determined by the sum of the electrical length L11 of the feed element 11 and the electrical length L11 of the parasitic element 12.
- the feeding element 11, the feeding element 15, and the parasitic element 12 have a second frequency corresponding to a second wavelength ⁇ 2 determined by the sum of the electrical length L12 of the feeding elements 11 and 15 and the electrical length L12 of the parasitic element 12 Resonate at f2.
- the feed element 15 is arranged to be capacitively coupled to the feed element 11 at least in part between the first end and the second end of the feed element 15.
- the antenna 2 ⁇ / b> A includes a strip-shaped feed element 25 formed on the front surface of the dielectric substrate 20.
- the feed element 25 has first and second ends connected respectively to connection points 21 e and 21 f at different positions on the feed element 21.
- the feed element 21 and the parasitic element 22 are arranged to be capacitively coupled to each other in at least a part of the open end 21 d of the feed element 21 and the open end 22 d of the parasitic element 22.
- the feed element 21 and the parasitic element 22 resonate at a frequency f1 corresponding to the wavelength ⁇ 1 determined by the sum of the electrical length L21 of the feed element 21 and the electrical length L21 of the parasitic element 22.
- the feeding element 21, the feeding element 25, and the parasitic element 22 have a second frequency corresponding to a second wavelength ⁇ 2 determined by the sum of the electric lengths L 22 of the feeding elements 21 and 25 and the electric length L 22 of the parasitic element 22. Resonate at f2.
- the feed element 25 is arranged to be capacitively coupled to the feed element 21 at least in part between the first end and the second end of the feed element 25.
- the antenna 3A includes a strip-shaped feed element 35 formed on the front surface of the dielectric substrate 30.
- the feed element 35 has first and second ends connected respectively to connection points 31 e and 31 f at different positions on the feed element 31.
- the feed element 31 and the parasitic element 32 are arranged to be capacitively coupled to each other in at least a part of the open end 31 d of the feed element 31 and the open end 32 d of the parasitic element 32.
- the feed element 31 and the parasitic element 32 resonate at a frequency f1 corresponding to the wavelength ⁇ 1 determined by the sum of the electric length L31 of the feed element 31 and the electric length L31 of the parasitic element 32.
- the feed element 31, the feed element 35, and the parasitic element 32 have a second frequency corresponding to a second wavelength ⁇ 2 determined by the sum of the electric length L32 of the feed elements 31 and 35 and the electric length L32 of the parasitic element 32. Resonate at f2.
- the feed element 35 is arranged to be capacitively coupled to the feed element 31 at least in part between the first end and the second end of the feed element 35.
- each antenna By forming a virtual capacitor between the two feed elements of each antenna, each antenna resonates in a wide band including frequencies f1 and f2.
- the physical length of the feed element can be shortened at a frequency determined by the capacitance, and the reduction in gain on the high band side can be mitigated.
- the antenna device according to the second embodiment further brings about the effects of the antenna device according to the first embodiment.
- the first and second embodiments have been described as examples of implementation according to the present disclosure.
- the embodiments of the present disclosure are not limited to these, and can be applied to configurations in which changes, replacements, additions, omissions, and the like are appropriately made.
- an antenna device provided with three antennas 1 to 3, one monopole antenna, and a ground conductor plate is disclosed.
- An antenna device may be provided that includes at least one antenna configured in the same manner as one of the sixteen antennas 1A and one of the antennas 1B of FIG. 18 and a ground conductor plate.
- the monopole antenna may be omitted, or an antenna device provided with two or more monopole antennas may be provided.
- ground conductor plate 104 is not limited to being provided as a dedicated component, and other components such as a shield plate of the electronic device 100 may be used as the ground conductor plate 104 of the antenna device. Further, the ground conductor plate 104 is not limited to a rectangular shape, and may have an arbitrary shape.
- the dielectric substrates 10, 20, and 30 are disposed at the chamfered positions of the back cover 105, but the embodiments of the present disclosure are not limited thereto.
- Dielectric substrates 10, 20, and 30 may be disposed parallel to ground conductor plate 104 on the same plane as ground conductor plate 104, and parallel to ground conductor plate 104 on a plane different from ground conductor plate 104. You may arrange each in.
- the electronic device 100 receives the broadcast signal of the frequency band of terrestrial digital television broadcasting, but the embodiment of the present disclosure is not limited thereto.
- the main circuit board 103 may include a wireless transmission circuit that transmits a wireless signal using an antenna device, and may include a wireless communication circuit that performs at least one of transmission and reception of a wireless signal using an antenna device.
- the antenna device provided with the antennas 1 to 4 and the wireless reception circuit on the main circuit board 103 constitute a wireless communication device which performs at least one of transmission and reception of a wireless signal.
- an electronic device that is a portable device for receiving a broadcast signal in the frequency band of digital terrestrial television broadcasting and displaying the content has been described as an example.
- Embodiments of the present disclosure are not limited thereto. Embodiments of the present disclosure can be applied to the above-described antenna device and a wireless communication device that performs at least one of transmission and reception of a wireless signal using the antenna device. In addition, the embodiment of the present disclosure can be applied to an electronic device such as a mobile phone including the above-described wireless communication device and a display device that displays a video signal included in a wireless signal received by the wireless communication device.
- the present disclosure is applicable to an electronic device that receives a wireless signal and displays a video signal included in the received wireless signal.
- the present disclosure is applicable to portable television broadcast receivers, mobile phones, smartphones, personal computers, and the like.
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Abstract
Description
少なくとも1つのアンテナと接地導体板とを備えたアンテナ装置において、
少なくとも1つのアンテナのそれぞれは、
第1の面及び第2の面を有する誘電体基板と、
誘電体基板の第1の面に形成されたストリップ形状の第1の給電素子であって、給電点に接続された第1の端部と、開放された第2の端部とを有する第1の給電素子と、
誘電体基板の第2の面に形成されたストリップ形状の無給電素子であって、接地導体板に接続された第1の端部と、開放された第2の端部とを有する無給電素子とを備え、
第1の給電素子及び無給電素子は、第1の給電素子の第2の端部及び無給電素子の第2の端部を含む少なくとも一部において互いに対向して配置される。
以下、図1~図14を参照して、第1の実施形態について説明する。
図1は、第1の実施形態に係る電子機器100を示す斜視図である。図2は、図1の電子機器100の分解斜視図である。図3は、図1のA-A線で切断した電子機器100の断面図である。各図面において、図面内に示すXYZ座標を参照する。図1他において、電子機器100の+Z側を「前面」と呼び、電子機器100の-Z側を「後面」と呼ぶ。また、電子機器100の動作帯域に含まれる周波数fに対応する波長をλとする。
以上のように構成されたアンテナ装置107の動作について、以下に説明する。
以上説明したように、第1の実施形態に係るアンテナ装置107は、アンテナ1~4及び接地導体板104を備え、アンテナ1~3は以下の構成を備える。
以下、図15~図19を参照して、第2の実施形態について説明する。
[2-1.構成]
第2の実施形態に係る電子機器100は、図1のアンテナ装置107に代えて、図15及び図16に示すアンテナ装置100Aを備える。アンテナ装置107Aは、誘電体基板10,20,30上にそれぞれ形成されたアンテナ1A,2A,3A,4と、接地導体板104とを備える。電子機器100の動作帯域に含まれる第1の周波数f1に対応する第1の波長をλ1とし、動作帯域に含まれる第2の周波数f2に対応する第2の波長をλ2とする。第2の実施形態に係る電子機器100の他の構成は第1の実施形態と同様であるので、説明を省略する。
以上のように構成されたアンテナ装置107Aの動作について、以下に説明する。
以上説明したように、第2の実施形態に係るアンテナ装置107Aは、アンテナ1A,2A,3A,4及び接地導体板104を備え、アンテナ1A,2A,3Aは、第1の実施形態に係るアンテナ装置107のアンテナ1~3の構成に加えて、以下の構成を備える。
以上のように、本開示に係る実装の例示として、第1及び第2の実施形態を説明した。しかしながら、本開示の実施形態は、これらに限定されず、適宜に、変更、置き換え、付加、省略などを行った構成にも適用できる。また、第1及び第2の実施形態で説明した各構成要素を組み合わせて、新たな実施形態とすることも可能である。
10,20,30…誘電体基板、
11,15,21,25,31,35,41…給電素子、
12,16,22,26,32,36…無給電素子、
13,23,33,43…給電点,
14,24,34…接続導体,
14a,24a,34a…接続点,
100…電子機器,
101…フロントパネル、
102…液晶ディスプレイ、
103…主回路基板、
104…接地導体板、
105…バックカバー、
106…テレビジョン受信装置、
107,107A,107B…アンテナ装置。
Claims (10)
- 少なくとも1つのアンテナと接地導体板とを備えたアンテナ装置において、
上記少なくとも1つのアンテナのそれぞれは、
第1の面及び第2の面を有する誘電体基板と、
上記誘電体基板の第1の面に形成されたストリップ形状の第1の給電素子であって、給電点に接続された第1の端部と、開放された第2の端部とを有する第1の給電素子と、
上記誘電体基板の第2の面に形成されたストリップ形状の無給電素子であって、上記接地導体板に接続された第1の端部と、開放された第2の端部とを有する無給電素子とを備え、
上記第1の給電素子及び上記無給電素子は、上記第1の給電素子の第2の端部及び上記無給電素子の第2の端部を含む少なくとも一部において互いに対向して配置されるアンテナ装置。 - 上記第1の給電素子及び上記無給電素子は、上記第1の給電素子の第2の端部及び上記無給電素子の第2の端部を含む少なくとも一部において互いに容量結合するように配置され、
上記第1の給電素子及び上記無給電素子は、上記第1の給電素子の電気長及び上記無給電素子の電気長の和によって決まる波長に対応する周波数で共振する、請求項1記載のアンテナ装置。 - 上記少なくとも1つのアンテナのそれぞれは、
上記誘電体基板の第1の面に形成されたストリップ形状の第2の給電素子であって、上記第1の給電素子上の異なる位置にそれぞれ接続された第1の端部及び第2の端部を有する第2の給電素子をさらに備える、請求項1記載のアンテナ装置。 - 上記第1の給電素子及び上記無給電素子は、上記第1の給電素子の第2の端部及び上記無給電素子の第2の端部を含む少なくとも一部において互いに容量結合するように配置され、
上記第1の給電素子及び上記無給電素子は、上記第1の給電素子の電気長及び上記無給電素子の電気長の和によって決まる第1の波長に対応する第1の周波数で共振し、
上記第1の給電素子、上記第2の給電素子、及び上記無給電素子は、上記第1の給電素子の第1の端部から上記第2の給電素子に接続された位置までの上記第1の給電素子の電気長、上記第2の給電素子の電気長、上記第1の給電素子の第2の端部から上記第2の給電素子に接続された位置までの上記第1の給電素子の電気長、及び上記無給電素子の電気長の和によって決まる第2の波長に対応する第2の周波数で共振し、
上記第2の給電素子は、上記第2の給電素子の第1の端部及び第2の端部の間の少なくとも一部において、上記第1の給電素子と容量結合するように配置される、請求項3記載のアンテナ装置。 - 上記アンテナ装置は、複数の給電点と、上記複数の給電点にそれぞれ接続された複数のアンテナとを備える、請求項1~4のいずれか1つに記載のアンテナ装置。
- 上記複数のアンテナのうちの少なくとも1つは、他のアンテナとは異なる偏波方向を有する、請求項5記載のアンテナ装置。
- 少なくとも1つのモノポールアンテナをさらに備える、請求項1~6のいずれか1つに記載のアンテナ装置。
- 上記アンテナ装置は、板状導体部品を備えた電子機器に設けられ、
上記接地導体板は上記板状導体部品である、請求項1~7のいずれか1つに記載のアンテナ装置。 - 請求項1~8のいずれか1つに記載のアンテナ装置と、
上記アンテナ装置を用いて無線信号の送信及び受信の少なくとも一方を行う無線通信回路とを備えた無線通信装置。 - 請求項9記載の無線通信装置を備えた電子機器。
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EP13869857.6A EP2950392B1 (en) | 2013-01-28 | 2013-12-18 | Antenna device |
JP2014526302A JP6128399B2 (ja) | 2013-01-28 | 2013-12-18 | アンテナ装置 |
US14/330,371 US9692140B2 (en) | 2013-01-28 | 2014-07-14 | Antenna apparatus capable of reducing decreases in gain and bandwidth |
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US9692140B2 (en) | 2017-06-27 |
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US20140320379A1 (en) | 2014-10-30 |
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