JPH10322124A - Wide-band plate-shaped antenna - Google Patents

Wide-band plate-shaped antenna

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Publication number
JPH10322124A
JPH10322124A JP14455897A JP14455897A JPH10322124A JP H10322124 A JPH10322124 A JP H10322124A JP 14455897 A JP14455897 A JP 14455897A JP 14455897 A JP14455897 A JP 14455897A JP H10322124 A JPH10322124 A JP H10322124A
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plate
antenna
board
wide
excitation
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JP14455897A
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JP3779430B2 (en )
Inventor
Masataka Shimabara
正隆 嶋原
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Nippon Antenna Co Ltd
日本アンテナ株式会社
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Abstract

PROBLEM TO BE SOLVED: To provide a wide-band plate-shaped antenna excellent in mass- productivity, capable of being operated in a wide band and capable of easily operating impedance adjustment or frequency adjustment.
SOLUTION: A core line 4-1 of a feeding cable 4 is connected with the end edge of a resonating board 2 on a ground board 1, so that feeding can be operated. A conductive board 2 smaller than the exciting board 2 is arranged so as to be faced to the exciting board 2, and a capacitance is generated between them. The impedance adjustment of an antenna can be operated by adjusting this capacitance. Also, the adjustment of the operating frequencies of the antenna can be operated by adjusting the surrounding length of the excition board 2 or the surrounding length of the conductive board 3.
COPYRIGHT: (C)1998,JPO

Description

【発明の詳細な説明】 DETAILED DESCRIPTION OF THE INVENTION

【0001】 [0001]

【発明の属する技術分野】本発明は、携帯無線機器に備えるに好適な低姿勢の広帯域特性を有する板状アンテナに関するものである。 The present invention relates to relates to a plate antenna with broadband characteristics suitable low profile to provide for a mobile wireless device.

【0002】 [0002]

【従来の技術】従来、携帯無線機器に備えられる低姿勢のアンテナとして逆F型アンテナが知られている。 Conventionally, an inverted F-type antenna is known as antenna low-profile provided in the portable wireless device. 逆F Reverse F
型アンテナの例として、特開昭61−210707号公報に記載されている逆F型アンテナを図4に示す。 Examples of type antenna, showing the inverted-F antenna that is described in JP-A-61-210707 in FIG. この逆F型アンテナは、金属製の無線機筐体53に設けられており、51は給電素子、52は励振板、54は接地導体、55は金属製の板をコ字状に折り曲げた金属ブリッジ部である。 The inverted-F antenna is provided on a metallic radio housing 53, the feed element 51, 52 is excited plate, 54 a ground conductor, 55 bending the metal plate in a U-shape metal it is a bridge section. このように構成された逆F型アンテナにおいて、給電素子51を介して給電された電力は、励振板52と筐体53の間に電波を励振する。 In such inverted-F antenna configured, power supplied through the feed element 51 excites the radio waves between the excitation plate 52 and the housing 53. この電波は励振板52のエッジ部分を通って空間に放射される。 This radio wave is radiated into space through the edge portion of the excitation plate 52. この場合、励振板52の大きさが波長に比べて小さくされていると、接地導体54は有効に逆F型アンテナの共振周波数を下げる働きをする。 In this case, the magnitude of the excitation plate 52 when being smaller than the wavelength, the ground conductor 54 serves to reduce the resonance frequency of effectively inverted-F antenna.

【0003】また、励振板52と金属ブリッジ部55との間の部分が等価的にキャパシタンスの働きをし、励振板52と筐体53との間隔を狭めた際の入力インピーダンス特性を向上することができるようになる。 [0003] the portion between the excitation plate 52 and the metal bridge 55 is equivalently acts as a capacitance, to improve the input impedance characteristics at the time of narrowing the interval between the excitation plate 52 and the housing 53 so that it is. なお、金属ブリッジ部55に替えて金属ブロックとすることができる。 Incidentally, it can be a metal block in place of the metal bridge 55.

【0004】 [0004]

【発明が解決しようとする課題】従来の一般的な逆F型アンテナの800MHz帯における電圧定在波比(VS THE INVENTION Problems to be Solved] voltage standing wave ratio in the 800MHz band of a conventional reverse F antenna (VS
WR)の周波数特性の一例を図3(b)に示す。 An example of the frequency characteristics of the WR) shown in FIG. 3 (b). この図に示すように、VSWRが「2」以下とされた周波数帯域fbは、中心周波数の約8%であり、逆F型アンテナが動作する周波数帯域は狭帯域になってしまっていた。 As shown in this figure, the frequency band fb which VSWR is less "2" is about 8% of the center frequency, the frequency band inverted-F antenna operates had ended up with narrowband.
このため、製作後に周波数特性等の調整を行う必要が生じ、量産に適しにくいアンテナであるという問題点があった。 Therefore, necessary to adjust such as frequency characteristics after fabrication occurs, there is a problem that it is difficult to antenna suitable for mass production. また、給電素子51とインピーダンス整合をとるように逆F型アンテナのインピーダンス調整を行う際には、給電素子51が励振板52に接続される給電位置の変更や、接地導体54の高さあるいは励振板52への接続位置を変更することが必要となる。 Further, when the impedance adjustment of the inverted F-type antenna to take feed element 51 and the impedance matching is changed and the feeding position feed element 51 is connected to the excitation plate 52, the height or the excitation of the ground conductor 54 it is necessary to change the connection position of the plate 52. さらに、使用周波数帯域の中心周波数に共振するように逆F型アンテナの動作周波数を調整する際には、励振板52の周囲長の変更や給電素子51が励振板52に接続される給電位置の変更を行う必要がある。 Furthermore, when adjusting the operating frequency of the inverted F-type antenna to resonate at the center frequency of the use frequency band, the feed position where the perimeter of the changes and the feed element 51 of the excitation plate 52 is connected to the excitation plate 52 there is a need to make changes.

【0005】このように、従来の逆F型アンテナにおいては、量産に向かないと共に、インピーダンス調整や周波数調整を行う作業が繁雑であり、その作業に長時間を費やすという問題点があった。 [0005] Thus, in the conventional inverted F-type antenna, with not suitable for mass production, the work of performing impedance adjustment and frequency adjustment are is complicated, there is a problem that spend a long time for the work. そこで、本発明は、広帯域で動作可能であると共に、インピーダンス調整や周波数調整を容易に行うことのできる量産性に優れた広帯域板状アンテナを提供することを目的としている。 The present invention, together with is operable in a wide band, and its object is to provide a wideband plate-like antenna which is excellent in mass productivity which can perform impedance adjustment and frequency adjustment easily.

【0006】 [0006]

【課題を解決するための手段】上記目的を達成するために、本発明の広帯域板状アンテナは、アース板と、該アース板を貫通するよう配置された同軸状の給電ケーブルと、該給電ケーブルの先端の芯線が端縁に接続されていると共に、所定の周囲長とされた励振板と、該励振板より小さな形状とされていると共に、該励振板と所定間隔だけ隔てて対向配置されている導体板とからなり、前記導体板の端縁に前記給電ケーブルの先端近傍のシールド部が接続されていると共に、前記導体板が前記アース板と対向配置されている。 To achieve the above object, according to the Invention The wide-band plate antenna of the present invention includes a ground plate, a coaxial feed cable which is arranged to penetrate the earth plate, the power feed cables the tip core wire of the is connected to the edge, and the excitation plate which is a predetermined peripheral length, with there is a smaller shape than 該励 oscillation plate, are disposed to face only 該励 oscillation plate a predetermined distance consists of a conductive plate are, together with the shield portion near the distal end of the feeder cable to the edge of the conductor plate is connected, the conductor plate is disposed opposite to the ground plate.

【0007】このような本発明によれば、広帯域板状アンテナの動作可能な周波数帯域を中心周波数に対して約15%もの広帯域とすることができる。 [0007] According to the present invention, may be about 15% of wideband with respect to the center frequency operable frequency band of the wideband plate-shaped antenna. また、広帯域板状アンテナのインピーダンス調整を、導体板の周囲長を変更することにより調整することができると共に、広帯域板状アンテナの動作周波数の調整を励振板の周囲長や導体板の周囲長を変更することにより行うことができる。 Further, the impedance adjustment of Broadband Planar antenna, it is possible to adjust by changing the peripheral length of the conductive plate, the peripheral length of the perimeter and the conductive plates of the excitation plate to adjust the operating frequency of the wideband plate-shaped antenna it can be carried out by changing. 従って、給電位置の付け直しや接地導体の付け直し等の繁雑な作業を行うことなく、インピーダンス調整および周波数調整を容易に行うことができ、量産性に優れたアンテナとすることができる。 Therefore, without performing troublesome operations with fix, with again and the ground conductor of the feed position, the impedance adjustment and frequency adjustment can be easily performed, it may be a good antenna for mass production.

【0008】 [0008]

【発明の実施の形態】本発明の広帯域板状アンテナの実施の形態の構成例における斜視図を図1に示す。 The perspective view of a configuration example of an embodiment of the wide-band plate antenna of the embodiment of the present invention is shown in FIG. 図1において、1はグランドプレーンとされるアース板であり、広帯域板状アンテナが無線機に設置される際に、無線機の筐体が金属製とされる場合には、この筐体がアース板1を兼ねることができる。 In Figure 1, 1 is a grounding plate which is a ground plane, when the wideband plate-shaped antenna is installed in the wireless device, when the casing of the radio is made of metal, the housing ground it can also serve as a plate 1. また、2は矩形状の励振板であり、3は励振板2に対向するよう配置された矩形状の導体板である。 Also, 2 is a rectangular excitation plate, 3 is a rectangular conductor plate arranged so as to face the excitation plate 2. さらに、4は広帯域板状アンテナに給電する同軸ケーブルとされた給電ケーブルであり、給電ケーブル4の芯線4−1は励振板2の端縁に接続され、給電ケーブル4のシールド部とされる外被は導体板3の端縁に接続されている。 Furthermore, outside a power supply cable which is a coaxial cable for feeding the Broadband Planar antenna, wire 4-1 of the feed cable 4 is connected to the edge of the excitation plate 2, which is shielded portion of the feeder cable 4 4 be is connected to the edge of the conductive plate 3. また、給電ケーブル4はアース板1を貫通するように設けられており、給電ケーブル4の他端から信号源5により給電されている。 Also, feed cable 4 is provided so as to penetrate the ground plate 1, and is powered by the signal source 5 from the other end of the supply cable 4.

【0009】また、図1に示す本発明の広帯域板状アンテナの側面図を図2に示す。 [0009] Figure 2 shows a side view of a wide-band plate antenna of the present invention shown in FIG. 図2に示すように給電ケーブル4は、アース板1を貫通するようアース板1に植設されており、この給電ケーブル4の上端部の外被に接続された導体板3は、アース板1から所定間隔だけ離隔されて配置されている。 Feed cable 4 as shown in FIG. 2 is embedded in the ground plate 1 so as to penetrate the ground plate 1, the conductive plate 3 connected to the jacket of the upper portion of the feeder cable 4 is grounded plate 1 They are arranged to be spaced apart by a predetermined distance from. さらに、この導体板3の上には所定間隔dだけ離隔されて励振板2が対向するよう配置されている。 Further, the excitation plate 2 are separated by a predetermined distance d on top of the conductive plate 3 is arranged to face. なお、導体板3の大きさは励振板2より小さくされている。 The size of the conductive plate 3 is smaller than the excitation plate 2. また、励振板2の端縁には給電ケーブル4の芯線4−1が接続されている。 Also, the edge of the excitation plate 2 core 4-1 of the feed cable 4 is connected. このような構成により、給電ケーブル4から給電された電力により、励振板2と導体板3およびアース板1の間に磁流が流れるようになる。 With this configuration, the power supplied from the power supply cable 4, to flow magnetic current between the excitation plate 2 and the conductive plate 3 and the ground plate 1. この磁流により励振された電磁波は、励振板2 Electromagnetic wave excited by this magnetic current, excitation plate 2
の端縁部分を介して空間に放射されるようになる。 It comes to be radiated into space through the edge portions of the. すなわち、アンテナとして動作するようになる。 That is, to operate as an antenna.

【0010】本発明の広帯域板状アンテナの特徴点は、 [0010] The characteristic point of the wide-band-shaped antenna of the present invention,
放射素子として動作しないように導体板3を励振板2より小さくしていること、および、励振板2に導体板3を狭い間隔dで対向させて、励振板2と導体板3との間に大きな容量を生じさせていることである。 It has a conductor plate 3 so as not to operate as a radiating element and smaller than the excitation plate 2, and, by opposing a narrow gap d of the conductive plate 3 to the excitation plate 2, between the excitation plate 2 and the conductive plate 3 is that is causing a large capacity. なお、励振板2と導体板3との間に容量を発生させるのは、広帯域板状アンテナのインピーダンス調整を導体板3により行うためである。 Note that to generate a capacitance between the excitation plate 2 and the conductive plate 3, in order to carry out the conductive plate 3 and the impedance adjustment of Broadband Planar antenna. すなわち、導体板3の幅や長さを適切な寸法に調整することにより、励振板2との間に発生する容量が変化して広帯域板状アンテナのインピーダンス調整を行うことができるようになる。 That is, by adjusting the width and length of the conductive plate 3 to the proper dimensions, it is possible to perform impedance adjustment of Broadband Planar antenna capacitance generated between the excitation plate 2 is changed. これにより、広帯域板状アンテナのインピーダンス整合を、導体板3の周囲長、すなわち大きさを調整することにより行うことができるようになる。 Thus, the impedance matching of Broadband Planar antenna, the perimeter of the conductive plate 3, that is, can be performed by adjusting the size. したがって、従来の逆F型アンテナのように励振板への給電位置の付け直しや接地導体の接続のし直しをすることなく、容易にインピーダンス調整を行えるようになる。 Therefore, without a re-connection with re and the ground conductor of the feeding position of the excitation plate as in the conventional inverted F-type antenna, so that can perform easy impedance adjustment. なお、作業工程が若干増加するが、 It should be noted that, although the working process is increased slightly,
励振板2と導体板3との間隔dを調整することによってもインピーダンス調整を行うことができる。 It is possible to perform an impedance adjusted by adjusting the distance d between the excitation plate 2 and the conductive plate 3.

【0011】また、インピーダンス調整用の導体板3を励振板2より小さくして、その下方に、かつ励振板2により覆われるように配置したことにより、導体板3による放射パターンや利得への影響を極力少なくすることができる。 Further, the conductive plate 3 for impedance adjustment to be smaller than the excitation plate 2, in its lower and by arranging so as to be covered by the excitation plate 2, the influence of by the conductive plate 3 to the radiation pattern and gain it can be significantly reduced. また、動作中心周波数における波長に対する導体板3の長辺の長さを有効長(例えば、1/4波長)とすることにより、周波数特性を持つようになり、導体板3の長辺の長さを調整することにより、本発明の広帯域板状アンテナの共振周波数の調整も行うことができる。 The effective length the length of the long side of the conductive plate 3 with respect to wavelength at the operating center frequency (e.g., 1/4-wavelength) by a, will have a frequency characteristic, the length of the long side of the conductive plate 3 by adjusting the adjustment of the resonance frequency of the wide-band plate antenna of the present invention can also be carried out.
さらに、当然のことではあるが、本発明の広帯域板状アンテナの共振周波数の調整を、励振板2の周囲長を調整することにより行うことができる。 Moreover, as a matter of course, the adjustment of the resonance frequency of the wide-band plate antenna of the present invention can be carried out by adjusting the peripheral length of the excitation plate 2. このように、励振板2あるいは導体板3の周囲長、すなわち大きさを調整することにより、動作周波数の調整を行うことができるので、従来の逆F型アンテナにおけるような、励振導体における給電位置の接続のし直しや接地導体の接続のし直し等の繁雑な作業を行うことなく動作周波数の調整を行うことができるようになる。 Thus, the circumferential length of the excitation plate 2 or the conductive plate 3, i.e. by adjusting the size, it is possible to adjust the operating frequency, such as in a conventional inverted F-type antenna, feed location in the excitation conductor it is possible to adjust the operating frequency without performing the a troublesome work and the like again to connect to back and the ground conductor connection.

【0012】以上説明した本発明の広帯域板状アンテナにおいては、中心周波数に対して約15%もの広帯域において動作するようになり、従来の逆F型アンテナの約2倍とされる周波数帯域で動作するようになる。 [0012] In Broadband Planar antenna of the present invention described above, now works in about 15% of wideband with respect to the center frequency, operating at about twice the the the frequency band of the conventional inverted F-type antenna It becomes the way. また、 Also,
本発明の広帯域板状アンテナにおける導体板3は、アース板1に接続されないように設けられているが、導体板3は逆F型アンテナにおける接地導体の役割を行っているものと考えられる。 The conductive plate 3 in a broadband-shaped antenna of the present invention is provided so as not to be connected to the ground plate 1, the conductive plate 3 is considered to have done the role of the ground conductor in the inverted-F antenna. さらに、本発明の広帯域板状アンテナの高さは、従来の逆F型アンテナと同様であって、 Further, the height of the wide-band plate antenna of the present invention is similar to a conventional inverted-F antenna,
本発明によれば低姿勢で広帯域な板状アンテナとすることができる。 It can be a wide-band plate antenna with low profile according to the present invention. さらに、放射パターンも従来の逆F型アンテナとほぼ同等とすることができる。 Furthermore, it is possible radiation pattern is also approximately equal to the conventional inverted F-type antenna.

【0013】次に、本発明の広帯域板状アンテナの80 [0013] Then, 80 of the wide-band-shaped antenna of the present invention
0MHz帯における電圧定在波比(VSWR)の周波数特性の一例を図3(a)に示す。 Voltage standing wave ratio in 0MHz band an example of a frequency characteristic of (VSWR) shown in FIG. 3 (a). 図3(a)を参照すると、本発明の広帯域板状アンテナのVSWRは、広い周波数帯域にわたり良好とされている。 Referring to FIG. 3 (a), VSWR of the broadband shaped antenna of the present invention is good over a wide frequency band. この際のVSWR VSWR at this time
が「2」以下とされた周波数帯域faは、中心周波数の約15%となり、きわめて広帯域となる。 There frequency bands fa which is "2" or less, becomes about 15% of the center frequency, the extremely wide band. このため、製作後に共振周波数の調整を行う必要はほとんどなく、量産に適したアンテナとされる。 Therefore, almost no need to adjust the resonant frequency after manufacture, is an antenna that is suitable for mass production. また、共振周波数を調整する場合においても、前述したように共振周波数の調整作業は簡単であって、量産に適したアンテナであることにかわりはない。 Further, in the case of adjusting the resonance frequency is also a simple adjustment of the resonance frequency as mentioned above, the fact remains that an antenna which is suitable for mass production.

【0014】なお、以上の説明では、励振板2および導体板3は矩形状としたが、本発明はこれに限らず、円形、楕円形、多角形等のどのような形状としてもよい。 [0014] In the above description, although the excitation plate 2 and the conductive plate 3 is a rectangular shape, the present invention is not limited to this, circular, elliptical, may be any shape such as a polygon.
また、本発明の広帯域板状アンテナにおいては、給電点および導体板の接続点を励振板2あるいは導体板3の端縁とすることができるので、その接続も容易に行うことができる。 In the wide-band plate antenna of the present invention, since the connection point of the feed point and the conductive plate may be the edge of the excitation plate 2 or the conductive plate 3, can be easily performed that connection.

【0015】 [0015]

【発明の効果】本発明は以上のように構成されているので、広帯域板状アンテナの動作可能な周波数帯域を中心周波数に対して約15%もの広帯域とすることができる。 Since the present invention according to the present invention is constructed as described above, it can be about 15% of wideband with respect to the center frequency operable frequency band of the wideband plate-shaped antenna. また、広帯域板状アンテナのインピーダンス調整を、導体板の大きさである周囲長を変更することにより調整することができると共に、広帯域板状アンテナの動作周波数の調整を励振板の周囲長や導体板の周囲長を変更することにより行うことができる。 Further, the impedance adjustment of Broadband Planar antenna, it is possible to adjust by changing the peripheral length is the size of the conductive plate, the circumferential length of the excitation plate to adjust the operating frequency of the wideband plate-shaped antenna and the conductive plate it can be carried out by changing the peripheral length of the. 従って、インピーダンス調整および周波数調整を容易に行うことができ、 Therefore, it is possible to perform impedance adjustment and frequency adjustment easily,
量産性に優れたアンテナとすることができる。 It can be an excellent antenna for mass production.

【図面の簡単な説明】 BRIEF DESCRIPTION OF THE DRAWINGS

【図1】本発明の広帯域板状アンテナの実施の形態の構成例の斜視図である。 1 is a perspective view of a configuration example of an embodiment of the wide-band plate antenna of the present invention.

【図2】図1に示す本発明の広帯域板状アンテナの側面図である。 2 is a side view of a wide-band plate antenna of the present invention shown in FIG.

【図3】本発明の広帯域板状アンテナのVSWRの周波数特性を示す図、および、従来の逆F型アンテナのVS FIG. 3 shows a frequency characteristic of a VSWR of the ultra wideband disc antenna of the present invention, and, in a conventional inverted F-type antenna VS
WRの周波数特性を示す図である。 Is a graph showing the frequency characteristics of WR.

【図4】従来の逆F型アンテナの一例を示す図である。 4 is a diagram showing an example of a conventional inverted F-type antenna.

【符号の説明】 DESCRIPTION OF SYMBOLS

1 アース板 2 励振板 3 導体板 4 給電ケーブル 4−1 芯線 5 信号源 51 給電素子 52 励振板 53 筐体 54 接地導体 55 金属ブリッジ板 1 Ground plate 2 excitation plate 3 conductive plate 4 feeder cable 4-1 core 5 the signal source 51 feeding element 52 excitation plate 53 enclosure 54 grounded conductor 55 metal bridge plate

Claims (1)

    【特許請求の範囲】 [The claims]
  1. 【請求項1】 アース板と、 該アース板を貫通するよう配置された同軸状の給電ケーブルと、 該給電ケーブルの先端の芯線が端縁に接続されていると共に、所定の周囲長とされた励振板と、 該励振板より小さな形状とされていると共に、該励振板と所定間隔だけ隔てて対向配置されている導体板とからなり、 前記導体板の端縁に前記給電ケーブルの先端近傍のシールド部が接続されていると共に、前記導体板が前記アース板と対向配置されていることを特徴とする広帯域板状アンテナ。 And 1. A ground plate, and coaxial feed cable which is arranged to penetrate the earth plate, the tip core wire of the power feeding cable is connected to the end edge, which is a predetermined perimeter an excitation plate, with there is a smaller shape than 該励 oscillation plate consists of a conductive plate which is disposed to face only 該励 oscillation plate a predetermined distance, near the tip of the feeder cable to the edge of the conductor plate with shield portion is connected, broadband Planar antenna, wherein said conductor plate is disposed opposite said ground plate.
JP14455897A 1997-05-20 1997-05-20 Broadband Planar antenna Expired - Fee Related JP3779430B2 (en)

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JP14455897A JP3779430B2 (en) 1997-05-20 1997-05-20 Broadband Planar antenna

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JP14455897A JP3779430B2 (en) 1997-05-20 1997-05-20 Broadband Planar antenna

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JPH10322124A true true JPH10322124A (en) 1998-12-04
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WO2002087012A1 (en) * 2001-04-24 2002-10-31 Telefonaktiebolaget Lm Ericsson Pifa antenna with higp structure
WO2005109569A1 (en) * 2004-05-12 2005-11-17 Yokowo Co., Ltd. Multi-band antenna, circuit substrate, and communication device
US8847833B2 (en) 2009-12-29 2014-09-30 Pulse Finland Oy Loop resonator apparatus and methods for enhanced field control
US8866689B2 (en) 2011-07-07 2014-10-21 Pulse Finland Oy Multi-band antenna and methods for long term evolution wireless system
US8988296B2 (en) 2012-04-04 2015-03-24 Pulse Finland Oy Compact polarized antenna and methods
US9123990B2 (en) 2011-10-07 2015-09-01 Pulse Finland Oy Multi-feed antenna apparatus and methods
US9203154B2 (en) 2011-01-25 2015-12-01 Pulse Finland Oy Multi-resonance antenna, antenna module, radio device and methods
US9246210B2 (en) 2010-02-18 2016-01-26 Pulse Finland Oy Antenna with cover radiator and methods
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WO2002087012A1 (en) * 2001-04-24 2002-10-31 Telefonaktiebolaget Lm Ericsson Pifa antenna with higp structure
WO2005109569A1 (en) * 2004-05-12 2005-11-17 Yokowo Co., Ltd. Multi-band antenna, circuit substrate, and communication device
US9761951B2 (en) 2009-11-03 2017-09-12 Pulse Finland Oy Adjustable antenna apparatus and methods
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US9246210B2 (en) 2010-02-18 2016-01-26 Pulse Finland Oy Antenna with cover radiator and methods
US9406998B2 (en) 2010-04-21 2016-08-02 Pulse Finland Oy Distributed multiband antenna and methods
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US9917346B2 (en) 2011-02-11 2018-03-13 Pulse Finland Oy Chassis-excited antenna apparatus and methods
US9673507B2 (en) 2011-02-11 2017-06-06 Pulse Finland Oy Chassis-excited antenna apparatus and methods
US8866689B2 (en) 2011-07-07 2014-10-21 Pulse Finland Oy Multi-band antenna and methods for long term evolution wireless system
US9450291B2 (en) 2011-07-25 2016-09-20 Pulse Finland Oy Multiband slot loop antenna apparatus and methods
US9123990B2 (en) 2011-10-07 2015-09-01 Pulse Finland Oy Multi-feed antenna apparatus and methods
US9531058B2 (en) 2011-12-20 2016-12-27 Pulse Finland Oy Loosely-coupled radio antenna apparatus and methods
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