WO2010007823A1 - 複共振アンテナ - Google Patents
複共振アンテナ Download PDFInfo
- Publication number
- WO2010007823A1 WO2010007823A1 PCT/JP2009/057449 JP2009057449W WO2010007823A1 WO 2010007823 A1 WO2010007823 A1 WO 2010007823A1 JP 2009057449 W JP2009057449 W JP 2009057449W WO 2010007823 A1 WO2010007823 A1 WO 2010007823A1
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- WIPO (PCT)
- Prior art keywords
- electrode
- tip
- frequency
- antenna
- end portion
- Prior art date
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- 239000003989 dielectric material Substances 0.000 abstract description 2
- 230000015556 catabolic process Effects 0.000 abstract 1
- 238000006731 degradation reaction Methods 0.000 abstract 1
- 239000000758 substrate Substances 0.000 description 11
- 239000004020 conductor Substances 0.000 description 7
- 239000002131 composite material Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 230000005855 radiation Effects 0.000 description 4
- 238000010295 mobile communication Methods 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- 230000000593 degrading effect Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000007261 regionalization Effects 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/10—Resonant antennas
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
-
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/30—Arrangements for providing operation on different wavebands
- H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
- H01Q5/342—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes
- H01Q5/357—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes using a single feed point
- H01Q5/364—Creating multiple current paths
- H01Q5/371—Branching current paths
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/30—Arrangements for providing operation on different wavebands
- H01Q5/378—Combination of fed elements with parasitic elements
-
- 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
- Patent Document 1 discloses an antenna that uses a plurality of radiating element conductors to widen a use bandwidth.
- a composite antenna used in a plurality of frequency bands is disclosed in Patent Document 2.
- FIG. 1 is a perspective view of the antenna shown in Patent Document 1.
- FIG. The main part of this antenna is composed of a first dielectric substrate 21 and a second dielectric substrate 22, and a ground electrode is formed on the entire lower surface of the first dielectric substrate 21.
- An L-shaped first radiating element conductor 23, a second radiating element conductor 24, and a third radiating element conductor 25 are formed on one or both surfaces of the second dielectric substrate 22, respectively.
- the entire length of the first radiating element conductor 23 is set to be slightly longer than approximately 1/8 at the center frequency of the used frequency band, and the length of the second radiating element conductor 24 is set to be slightly shorter than that.
- the overall length of the third radiating element conductor 25 is set to approximately 1 ⁇ 4 wavelength of the center frequency of the higher frequency band of the two bands used.
- FIG. 2 is a configuration diagram of the composite antenna disclosed in Patent Document 2.
- This composite antenna 10 Includes a main element (11, 14) having one end as a feeding point and a sub-element (13, 16) having the other end of the main element folded back and having the terminal end as an open end.
- the folded antennas A and B correspond to a plurality of use frequency bands, and the main elements (11, 14) and the sub elements (13, 16) are projected from the ground plane 3.
- JP 2003-258527 A Japanese Patent Laid-Open No. 11-68453
- the antenna of Patent Document 1 as shown in FIG. 1 has a structure in which a substrate on which a radiation electrode is formed is set up against another substrate (mother substrate). It cannot be adapted for mobile communication devices such as terminals.
- the composite antenna of Patent Document 2 as shown in FIG. 2 can be used in two frequency bands, but is not compatible with the three frequency bands. That is, even if three sub-elements are provided so as to be folded with respect to a main element having one end as a feeding point in the same way of thinking, the three resonance characteristics deteriorate due to interference between the sub-elements. There is no guarantee that a composite antenna that can be used in one frequency band will be obtained.
- An object of the present invention is to provide a multi-resonant antenna that can be used in three frequency bands so that independent resonance characteristics can be obtained without degrading the three resonance characteristics.
- the present invention is configured as follows. (1) a first electrode having a length corresponding to the first frequency band, extending from the power feeding unit in the first direction along the periphery of the substantially rectangular region, and having an open end; The tip has a length corresponding to a second frequency band higher than the first frequency, and extends from the power supply portion in a second direction opposite to the first direction along the periphery of the substantially rectangular region. A second electrode having an open portion; It has a length corresponding to a third frequency band that is an intermediate frequency between the first and second frequencies.
- the third electrode is arranged in the first and second electrodes arranged on the outer side thereof, and close to the long first electrode side, thereby corresponding to the third electrode. Good matching can be obtained at the resonance frequency. Further, since the third electrode does not significantly affect the characteristics of the two resonances caused by the first and second electrodes, the desired three resonance characteristics can be obtained. These reasons will become clear from the description of the embodiment later.
- FIG. 3 is a perspective view of an electrode pattern forming region of the multi-resonant antenna according to the first embodiment.
- a first electrode extending in the first direction (counterclockwise direction) from the power feeding unit 30 along the periphery of the rectangular region and having the tip T1 opened.
- a (first radiation electrode) 31 is formed.
- a second electrode (second radiation electrode) 32 is formed which extends in the second direction (clockwise direction) from the power feeding unit 30 along the periphery of the rectangular region and has the tip T2 opened. .
- the first electrode 31 has a length corresponding to the frequency of the 900 MHz band which is the first frequency
- the second electrode 32 has a length corresponding to the 2100 MHz band which is the second frequency band. Yes.
- the second electrode 32 extends along the first electrode 31 from the middle of the first electrode 31 and the second electrode 32 from the middle of the second electrode 32 and the tip portion T3.
- a third electrode (third radiation electrode) 33 is formed in which is opened.
- the third electrode 33 is an intermediate frequency between the first and second frequencies, and is higher than the first frequency, lower than the second frequency, and has a length corresponding to the frequency of the 1600 MHz band which is the third frequency band. have.
- the third electrode 33 is arranged so that the tip portion T3 of the third electrode 33 is closer to the tip portion T1 side of the first electrode 31 than the tip portion T2 of the second electrode 32 is.
- the tip T3 of the third electrode 33 is formed so as to be closer to the tip than the center (1/2 length) in the length direction of the first electrode 31.
- FIG. 4 is a diagram showing the frequency characteristics of the return loss of the multi-resonant antenna 101 shown in FIG.
- the reduction in the return loss in the first frequency band indicated by f1 is due to the resonance of the first electrode 31 shown in FIG. 3, and the reduction in the return loss in the second frequency band indicated by f2 is shown in FIG. This is due to resonance of the second electrode 32. Further, the reduction in return loss in the third frequency band indicated by f3 is due to the resonance of the third electrode 33 shown in FIG.
- FIG. 5 is a diagram showing frequency characteristics of the efficiency of the multi-resonant antenna 101 shown in FIG.
- a curve E1 having a frequency of 815 to 935 MHz is caused by resonance of the first electrode 31 shown in FIG. 3
- a curve E2 having a frequency of 1910 to 2140 MHz is caused by resonance of the second electrode 32 shown in FIG.
- a curve E3 having a frequency of 1555 to 1595 MHz is due to resonance of the third electrode 33 shown in FIG.
- the first electrode 31 that resonates at the lowest frequency and the second electrode 32 that resonates at the highest frequency are disposed outside, and the first electrode 31 that is an intermediate frequency is disposed inside the first electrode 31.
- a third electrode 33 that resonates at a frequency of 2 is disposed, and the third electrode 33 is disposed on the side closer to the first electrode 31.
- the capacitance balance between the third electrode and the first and second electrodes can be achieved, sufficient matching can be achieved, and deterioration in efficiency can be suppressed.
- the tip portion T3 of the third electrode 33 is closer to the tip portion T1 side of the first electrode 31 than the tip portion T2 of the second electrode 32, whereby the first electrode and the third electrode are connected. It can be strongly coupled capacitively. However, it is important that the open ends of the third electrode and the first electrode are not so strongly coupled.
- FIG. 6 is a diagram showing a configuration of two antennas as a comparative example of the multi-resonant antenna 101 according to the first embodiment.
- the configuration of the first electrode 31 and the second electrode 32 is the same as that shown in FIG.
- the third electrode 33A is drawn from the same position as that shown in FIG. 3, but only extends partially along the first electrode 31, and the tip T3 has the first electrode 31.
- the tip portion T1 of the second electrode 32 is disposed closer to the tip portion T2.
- the first electrode 31 and the second electrode 32 are branched from the power feeding unit 30 as in the example of FIG. 3, but the other electrode 34 is the second electrode 32. And an end portion close to the power feeding portion 30 is grounded.
- the tip portion T3 of the third electrode 33 is disposed closer to the tip portion T1 of the first electrode 31 than the tip portion T2 of the second electrode 32.
- the third electrode 33 does not branch from the middle of the first electrode 31 as shown in FIG. 7 and does not branch from the middle of the second electrode 32 as shown in FIG. You may form so that it may extend directly from 30.
- various electrodes are formed on the upper surface of a substrate made of a rectangular plate-like dielectric.
- the present invention is not limited to those formed on the substrate, You may form in the substantially rectangular area
- the first, second, and third electrodes may be integrally formed on a part of the casing of an electronic device such as a mobile phone terminal.
Landscapes
- Variable-Direction Aerials And Aerial Arrays (AREA)
- Details Of Aerials (AREA)
- Waveguide Aerials (AREA)
Abstract
Description
は、一端を給電点とする主素子(11,14)と、主素子の他端を折り返して終端を開放端とする副素子(13,16)とを含み、ほぼコの字型状の複数の折り返しアンテナA,Bを複数の使用周波数帯域に対応させていて、接地面3から上記主素子(11,14)及び副素子(13,16)を突出させている。
(1)第1の周波数帯に応じた長さを有し、略矩形領域の周囲に沿って給電部から第1の方向へ延びて先端部が開放された第1の電極と、
第1の周波数より高い第2の周波数帯に応じた長さを有し、前記略矩形領域の周囲に沿って前記給電部から前記第1の方向とは逆の第2の方向へ延びて先端部が開放された第2の電極と、
第1・第2の周波数の中間の周波数である第3の周波数帯に応じた長さを有し、前記第1の電極又は第2の電極の途中から若しくは前記給電部から、前記第1・第2の電極が取り囲む前記略矩形領域の内部で前記第1の電極に沿って延びて先端部が開放され、且つ当該先端部が第2の電極の先端部より第1の電極の先端部の側に近接した第3の電極と、
を備えたことを特徴とする。
また、第3の電極は、第1・第2の電極による2つの共振の特性に大きな影響を与えないので、所望の3共振特性を得ることができる。
これらの理由については後の実施形態の説明で明らかとなる。
第1の実施形態に係る複共振アンテナについて図3~図6を参照して説明する。
図3は第1の実施形態に係る複共振アンテナの電極パターン形成領域の斜視図である。矩形板状の誘電体からなる基板50の上面には、矩形領域の周囲に沿って給電部30から第1の方向(左回り方向)へ延びて、先端部T1が開放された第1の電極(第1の放射電極)31を形成している。また矩形領域の周囲に沿って、給電部30から第2の方向(右回り方向)へ延びて、先端部T2が開放された第2の電極(第2の放射電極)32を形成している。
このようにして、3つの共振周波数のうち、最も低い周波数で共振する第1の電極31及び最も高い周波数で共振する第2の電極32を外側に配置し、その内部に中間の周波数である第2の周波数で共振する第3の電極33を配置し、且つこの第3の電極33を第1の電極31に近い側に配置する。このことによって、第3の電極と第1・第2の電極との電極間の容量バランスをとることができ、十分なマッチングがとれ、効率の劣化を抑えることができる。
図6(A)の例では、第1の電極31及び第2の電極32の構成は図3に示したものと同様である。第3の電極33Aは、図3に示したものと同様の位置から引き出しているが、第1の電極31に部分的に沿って延びているだけであり、先端部T3は第1の電極31の先端部T1より第2の電極32の先端部T2寄りに配置している。
また図6(B)のように、グランドに直接接続された電極34を設けた場合には、給電部とグランドの接点の2箇所をRF回路側に接続する必要があり、接点数の増加に伴う不安定性が問題となる。
図7は第2の実施形態に係る複共振アンテナ102の斜視図である。給電部30から右回りに第1の電極31が延びるように形成し、給電部30から右方向へ直線上に延びる第2の電極32を形成している。そして、第1の電極31と第2の電極32が取り囲む矩形領域の内部で、第1の電極31の途中からその第1の電極31に沿って延びる第3の電極33を形成している。
このように第1の電極31の途中から第3の電極33を分岐するようにしても第1の実施形態の場合と同様の3共振特性が得られる。
図8は第3の実施形態に係る複共振アンテナ103の平面図である。この例では、第1の電極31はL字状ではなくコ字状に折り返している。また第3の電極33も第1の電極31の内部に沿ってコ字状に折り返している。この第3の電極33の先端部T3は第2の電極32の先端部T2より第1の電極31の先端部T1に近接している。
図9は第4の実施形態に係る複共振アンテナ104の斜視図である。この複共振アンテナ104を構成する第1の電極31、第2の電極32、及び第3の電極33のパターンは図3に示した複共振アンテナ101のそれぞれの電極パターンとは鏡対称の関係となっている。このような構成であっても当然に第1の実施形態の場合と同様の特性が得られる。
31…第1の電極
32…第2の電極
33…第3の電極
34…電極
50…基板
101~104…複共振アンテナ
T1,T2,T3…先端部
Claims (2)
- 第1の周波数帯に応じた長さを有し、略矩形領域の周囲に沿って給電部から第1の方向へ延びて先端部が開放された第1の電極と、
第1の周波数より高い第2の周波数帯に応じた長さを有し、前記略矩形領域の周囲に沿って前記給電部から前記第1の方向とは逆の第2の方向へ延びて先端部が開放された第2の電極と、
第1・第2の周波数の中間の周波数である第3の周波数帯に応じた長さを有し、前記第1の電極又は第2の電極の途中から若しくは前記給電部から、前記第1・第2の電極が取り囲む前記略矩形領域の内部で前記第1の電極に沿って延びて先端部が開放され、且つ当該先端部が第2の電極の先端部より第1の電極の先端部の側に近接した第3の電極と、
を備えたことを特徴とする複共振アンテナ。 - 前記第3の電極の先端部は前記給電部からみて、第1の電極の長さ方向の中央より先端部寄りに位置する請求項1に記載の複共振アンテナ。
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1100667.3A GB2475802B (en) | 2008-07-17 | 2009-04-13 | Multi-resonant antenna |
JP2010504339A JP5170233B2 (ja) | 2008-07-17 | 2009-04-13 | 複共振アンテナ |
US13/007,360 US8643549B2 (en) | 2008-07-17 | 2011-01-14 | Multi-resonant antenna |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2008185508 | 2008-07-17 | ||
JP2008-185508 | 2008-07-17 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US13/007,360 Continuation US8643549B2 (en) | 2008-07-17 | 2011-01-14 | Multi-resonant antenna |
Publications (1)
Publication Number | Publication Date |
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WO2010007823A1 true WO2010007823A1 (ja) | 2010-01-21 |
Family
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PCT/JP2009/057449 WO2010007823A1 (ja) | 2008-07-17 | 2009-04-13 | 複共振アンテナ |
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US (1) | US8643549B2 (ja) |
JP (1) | JP5170233B2 (ja) |
GB (1) | GB2475802B (ja) |
WO (1) | WO2010007823A1 (ja) |
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JP2014233030A (ja) * | 2013-05-30 | 2014-12-11 | 三菱マテリアル株式会社 | アンテナ装置 |
JP2014233031A (ja) * | 2013-05-30 | 2014-12-11 | 三菱マテリアル株式会社 | アンテナ装置 |
JP2014233032A (ja) * | 2013-05-30 | 2014-12-11 | 三菱マテリアル株式会社 | アンテナ装置 |
WO2016203889A1 (ja) * | 2015-06-16 | 2016-12-22 | ソニー株式会社 | アンテナ素子及び情報処理装置 |
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US9172777B2 (en) * | 2013-03-07 | 2015-10-27 | Htc Corporation | Hairpin element for improving antenna bandwidth and antenna efficiency and mobile device with the same |
EP3499641B1 (en) * | 2014-02-12 | 2022-01-26 | Huawei Device Co., Ltd. | Antenna and mobile terminal |
US9991585B2 (en) * | 2014-04-28 | 2018-06-05 | Huawei Device (Dongguan) Co., Ltd. | Antenna apparatus and terminal |
EP3142187A1 (en) * | 2015-09-14 | 2017-03-15 | Advanced Automotive Antennas, S.L.U. | A mimo antenna system for a vehicle |
USD856984S1 (en) * | 2016-06-21 | 2019-08-20 | Redpine Signals, Inc. | Compact multi-band antenna |
TWI765743B (zh) * | 2021-06-11 | 2022-05-21 | 啓碁科技股份有限公司 | 天線結構 |
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2009
- 2009-04-13 WO PCT/JP2009/057449 patent/WO2010007823A1/ja active Application Filing
- 2009-04-13 GB GB1100667.3A patent/GB2475802B/en not_active Expired - Fee Related
- 2009-04-13 JP JP2010504339A patent/JP5170233B2/ja not_active Expired - Fee Related
-
2011
- 2011-01-14 US US13/007,360 patent/US8643549B2/en active Active
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JPS63138710U (ja) * | 1987-03-03 | 1988-09-13 | ||
JPH11317612A (ja) * | 1998-04-30 | 1999-11-16 | Yokowo Co Ltd | 折り返しアンテナとアンテナ装置および無線機 |
JP2007036338A (ja) * | 2005-07-22 | 2007-02-08 | Anten Corp | アンテナ |
WO2007046285A1 (ja) * | 2005-10-17 | 2007-04-26 | Nec Corporation | アンテナユニット及び通信機器 |
WO2007049414A1 (ja) * | 2005-10-25 | 2007-05-03 | Sony Ericsson Mobile Communications Japan, Inc. | マルチバンド対応アンテナ装置および通信端末装置 |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2014233030A (ja) * | 2013-05-30 | 2014-12-11 | 三菱マテリアル株式会社 | アンテナ装置 |
JP2014233031A (ja) * | 2013-05-30 | 2014-12-11 | 三菱マテリアル株式会社 | アンテナ装置 |
JP2014233032A (ja) * | 2013-05-30 | 2014-12-11 | 三菱マテリアル株式会社 | アンテナ装置 |
WO2016203889A1 (ja) * | 2015-06-16 | 2016-12-22 | ソニー株式会社 | アンテナ素子及び情報処理装置 |
Also Published As
Publication number | Publication date |
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US8643549B2 (en) | 2014-02-04 |
JPWO2010007823A1 (ja) | 2012-01-05 |
US20110109513A1 (en) | 2011-05-12 |
GB2475802B (en) | 2012-08-01 |
GB2475802A (en) | 2011-06-01 |
GB201100667D0 (en) | 2011-03-02 |
JP5170233B2 (ja) | 2013-03-27 |
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