JP3006867B2 - Wideband planar antenna - Google Patents

Wideband planar antenna

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Publication number
JP3006867B2
JP3006867B2 JP2283737A JP28373790A JP3006867B2 JP 3006867 B2 JP3006867 B2 JP 3006867B2 JP 2283737 A JP2283737 A JP 2283737A JP 28373790 A JP28373790 A JP 28373790A JP 3006867 B2 JP3006867 B2 JP 3006867B2
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element
planar antenna
feed element
flat metal
plate
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JPH04157905A (en
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矩芳 寺田
吉英 山田
誠 木島
英章 木村
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エヌ・ティ・ティ移動通信網株式会社
日本電信電話株式会社
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Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は衛星通信や移動通信等に用いられるアンテナに関し、特に、それ自体でアンテナとして用いられる他、アレーアンテナの放射素子として用いられる広帯域特性を有するプリントアンテナおよびパッチアンテナ等の広帯域平面アンテナの構造に係る。 DETAILED DESCRIPTION OF THE INVENTION The present invention [relates] relates antenna used for satellite communication or mobile communication, etc., in particular, other used by itself as an antenna, a broadband characteristic used as a radiating element of the array antenna according to the structure of the wideband planar antenna such as a printed antenna and a patch antenna having a.

〔従来の技術〕 [Prior art]

プリントおよびパッチ等の平面アンテナで広帯域化を図るための構成として、給電素子の前方に複数枚の無給電素子を多層に積み上げた多層構造のものと、同一平面内に給電素子と多数の無給電素子を有する1層構造のものとがある。 As a configuration for achieving broadband in planar antenna such as a printed and patches, and a multilayer structure by stacking a plurality of parasitic elements in multilayer in front of the feed element, the feed element and a plurality of parasitic in the same plane there are those of single-layer structure including an element.

前者の多層構造については第6図に示すような、Ball For the former multilayer structure as shown in FIG. 6, Ball
Corp.社出願の「広帯域マイクロストリップアンテナ及びその製法」(特開昭63−189002)がある。 There is a "wide-band microstrip antenna and its manufacturing method" (JP-A-63-189002) of Corp., filed. このアンテナは同図(a)に示すように、給電素子の前方に無給電素子を2層重ねた3層構造を採っている。 The antenna as shown in FIG. 6 (a), adopts a three-layer structure in which stacked parasitic elements 2 layers in front of the feed element. 同図において In FIG.
51は金属板、52は誘電体板、53は放射素子、54は給電点、55および56は広帯域化のための無給電素子、57および58は無給電素子の支持板である。 51 metal plate, 52 is a dielectric plate, 53 is the radiating element, 54 designates a feed point, the parasitic element for 55 and 56 broadband, 57 and 58 are supporting plate of the passive element.

広帯域化は、増幅器等で周知技術であるスタガ同調の概念と同じである。 Broadband is the same as the stagger tuning concepts are well known techniques in amplifier or the like. 即ち同図(b)に示すように、給電素子と直上の無給電素子の周波数を目標の帯域の両端に位置するように選定し、最上面の無給電素子の周波数が帯域中央に配置することにより、広い帯域で良好な整合を得ることができる。 That is, as shown in FIG. (B), selects the frequency of the parasitic element immediately above the feed element so as to be positioned at both ends of the band of the target, the frequency of the parasitic element of the top surface is arranged in the band center Accordingly, it is possible to achieve a good alignment in a wide band. 実現性能としては、反射量がVSWR The realization performance, the amount of reflection VSWR
<1.5となる帯域幅が17%となる極めて広帯域な特性が得られている。 <Extremely wideband characteristic bandwidth is 17%, which is 1.5 is obtained.

一方、1層構造の例としては、第7図に示すような、 On the other hand, examples of the 1-layer structure, as shown in FIG. 7,
CKAananden「Compact Broadband Microstrip Antenn CKAananden "Compact Broadband Microstrip Antenn
a」(Electronics Letters 25th September 1986 Vol.2 a "(Electronics Letters 25th September 1986 Vol.2
2,No.20)、及び第8図のKCGuptaの「Nonradiating E 2, No.20), and "Nonradiating E of KCGupta of Figure 8
dges and Four Edges Gap−Coupled Multiple Resonato dges and Four Edges Gap-Coupled Multiple Resonato
r Broad−Band Microstrip Antennas」(IEEE Transact r Broad-Band Microstrip Antennas "(IEEE Transact
ions on Antennas and Propagation,Vol.AP−33,No.2,F ions on Antennas and Propagation, Vol.AP-33, No.2, F
ebruary 1985)などの文献に記されたものがある。 ebruary 1985) there is a thing that has been written in the literature, such as.

第7図に示すAanandanの例では、同図(a)のように給電点64を有する短冊形の給電素子63に並列に5素子の長さの等しい短冊形無給電素子65〜69を配列している。 In the example of Aanandan shown in FIG. 7, by arranging strip-shaped parasitic element 65 to 69 of equal length in parallel with 5 element feed element 63 of strip form having a feeding point 64 as shown in FIG. (A) ing.
このアンテナの帯域特性を(b)に示す。 It shows the band characteristic of the antenna in (b). ここで、70はアンテナ入力インピーダンスの周波数変化の軌跡を表しており、同図の円はスミスチャートである。 Here, 70 represents the locus of the frequency change of the antenna input impedance, a circle in the figure is a Smith chart. また、同図の小円71の内側がVSWR<2となる範囲を示している。 Also it shows the extent to which the inside of the small circle 71 in FIG become VSWR <2. この例ではVSWR<2で6%の帯域幅が示されている。 Bandwidth 6% VSWR <2 is shown in this example.

〔発明が解決しようとする課題〕 [Problems that the Invention is to Solve]

上述したような広帯域平面アンテナの内、第6図に示す多層構造のものにおいては、第1層と第2の層を極めて近接して配置する必要があり、高い精度の組み立て技術が必要となり、また、誘電体板を3枚重ねてアンテナを組み上げる必要があることから、量産性を損ねるとともに、重量の増大を伴うという欠点があった。 Of wideband planar antenna as described above, in a multilayer structure shown in FIG. 6, it is necessary to arrange the first layer and the second layer in close proximity, it requires a high precision of assembly techniques, Further, since it is necessary to assemble the antennas three sheets of the dielectric plate, with deteriorating the productivity, has a drawback that with increased weight.

一方、第7図に示すような1層構造の広帯域平面アンテナにおいては、無給電素子を加えることにより帯域幅は10倍程度に増大することができるものの、例えば、自動車電話方式用アンテナとしては比帯域10%程度が要求されており、6%という値は広帯域性能としては不十分であった。 Meanwhile, in the wideband planar antenna of one-layer structure as shown in FIG. 7, although the bandwidth by adding parasitic elements can be increased to about 10 times, for example, as an antenna for an automobile telephone system ratio band about 10% are required, a value of 6% was insufficient as a broadband performance.

また、同図(a)に示す放射特性に見られるように、 Moreover, as seen in the radiation characteristic shown in FIG. 6 (a),
周波数により英字符Eで示すようにビーム方向が変化するという不都合も生ずる。 Also occurs inconvenience that the beam direction as indicated by alphabetic marks E by frequency changes.

更に、第8図のGuptaの例では、同図(a)に示すように給電点74を有する矩形の給電素子73に並列に2個の矩形無給電素子75,76を配列している。 Further, in the example of Gupta of Figure 8, it is arranged two rectangular parasitic element 75, 76 in parallel to a rectangular feeding element 73 having a feeding point 74 as shown in the diagram (a). このアンテナの帯域特性は同図(b)に示すようになる。 Band characteristic of the antenna is as shown in FIG. (B).

同図において、80はアンテナ入力インピーダンスの周波数変化の軌跡を表わしており、VSWR<2となる帯域幅 In the figure, 80 represents the locus of the frequency change of the antenna input impedance, bandwidth of VSWR <2
77は15%強の性能が得られている。 77 have been obtained the performance of the 15% strength. しかし、帯域幅は改善されたものの、3層構造の1/2程度が達成されたのみで、広帯域性としては未だ十分で無い。 However, although the bandwidth is improved, only it has been achieved about 1/2 of the three-layer structure, not yet sufficient for a wideband property. また、同図(a)の放射特性に見られるように、周波数により英字符Fで示すようにビーム方向が変化するという不都合も生ずる。 Moreover, as seen in the radiation characteristic of the drawing (a), also occurs inconvenience that the beam direction changes as shown by the letter marks F by frequency.

本発明はこのような従来の問題点に鑑み、給電素子の前方に1層の無給電素子を配置する簡単な2層構造によって、これまで3層構造で達成されたと同程度の広帯域性能を得ることの可能な平面アンテナを実現することを目的としている。 The present invention has been made in view of these conventional problems, a simple two-layer structure to place the parasitic elements of one layer in front of the feed element, to obtain the same degree of broadband performance with previous was accomplished in a three-layer structure It is intended to achieve a possible planar antenna that.

〔課題を解決するための手段〕 [Means for Solving the Problems]

本発明によれば、上述の目的は、前記特許請求の範囲に記載した手段により達成される。 According to the present invention, the above object is achieved by the means described in the scope of the appended claims.

すなわち、本発明は、平面の金属板からなるアース板の前面に誘電体板をはさんで、短冊形状の金属平板の給電素子(A)を該給電素子と前記アース板の面とが平行と成るように配置し、更にその前面に1つの金属平板の導波素子(B)を有する平面アンテナにおいて、給電素子と同一面に、金属平板(C)を複数個、給電素子に対して対称となるように配置し、前記導波素子(B)の共振周波数が前記給電素子(A)及び前記金属平板(C) That is, the present invention is, across the dielectric plate to the front surface of the ground plate made of a metal plate of a plane, and the surface of the feed element of the flat metal strip shape (A) and the power feed element and the ground plate is parallel arranged so that, in yet a planar antenna having a waveguide element (B) of one of the flat metal plate in front, on the same plane and the feed element, symmetrical metal flat plate (C) a plurality, relative feed element so as to place the resonant frequency of the waveguide element (B) is the feeding device (a) and the metal flat plate (C)
の各共振周波数のうち最高周波数と最低周波数の間に設定した広帯域平面アンテナである。 A wideband planar antenna set at between the highest and lowest frequencies of the resonance frequencies of the.

〔作 用〕 [For work]

比帯域15%以上の広帯域特性を達成するためには、最低限3つの共振周波数が必要となるが、本発明においては、給電素子と同一面内に複数個の無給電素子を配置することにより、給電素子の周波数に加えて無給電素子の種類に応じた数の共振周波数を、一つの層で得ることができるようにしている。 To achieve fractional bandwidth of 15% or more of the wide band characteristic is a minimum three resonant frequencies are required, in the present invention, by arranging a plurality of parasitic elements to the feed element and the same plane the number of resonant frequencies in accordance with the type of addition parasitic elements to the frequency of the feed element, so that it is possible to obtain a single layer.

すなわち、本発明においては、第1層の給電素子および無給電素子の周波数を目標帯域の両端に設定し、これらの素子の真上に当たる位置に、目標帯域の中心付近の共振周波数を有する無給電素子を配置し、これら複数の周波数の合成により、簡単な2層構造により広帯域化を達成している。 That is, in the present invention, the frequency of the feed element and the parasitic element of the first layer is set at both ends of the target band, the position corresponding to just above these elements, parasitic having a resonant frequency near the center of the target band the elements are arranged, by the synthesis of a plurality of frequencies have achieved broadband a simple two-layer structure.

〔実施例〕 〔Example〕

第1図は本発明の一実施例を示す図であって、(a) Figure 1 is a diagram showing an embodiment of the present invention, (a)
は構造図を示している。 It shows a structure diagram. 同図に示すように、アース板1 As shown in the figure, the ground plate 1
で裏打ちされた誘電体板2の表面に、給電素子3およびその両側に対称位置に配置された無給電素子5,6を形成し、その上方に、無給電素子5の外側から無給電素子6 To in lined dielectric plate second surface, the feed device 3 and the parasitic element 5,6 which are arranged at symmetrical positions formed on both sides, in its upper, non-feed element 6 from the outside of the parasitic element 5
の外側までの寸法(図中に英字符Gで示す)と同程度の幅(G′)を有する第2の無給電素子7を給電素子と0. The dimensions of the to the outside (indicated by letter marks G in the figure) and a second parasitic element 7 having a comparable width (G ') and the feed element 0.
1波長程度の間隔を保って配置し、さらに必要に応じて支持板8を有するように構成されている。 At a distance of about one wavelength is disposed, and is configured to have a support plate 8 as necessary.

同図(b)は動作原理図である。 FIG (b) is an operation principle diagram. 給電素子の共振周波数をf0、両側の同寸法の無給電素子の共振周波数をf2として、各々を帯域の上下端に位置するように各素子寸法を選定する。 The resonance frequency of the feed element f0, the resonant frequency of the parasitic element on both sides of the same dimensions as f2, selecting each element dimensions so as to be located respectively on the upper and lower ends of the band. また、給電素子上方の無給電素子7は、共振周波数f1がf0とf2の中間に位置するように素子寸法を選定する。 Further, the feeding device above the parasitic element 7, the resonance frequency f1 is selected element dimensions so as to be positioned in the middle of f0 and f2. ここで、f0とf2は薄い誘電体板2を介した共振であるため狭帯域であるが、f1はアース板1と無給電素子7の広い間隔を挟んだ共振であるため広帯域である。 Here, f0 and f2 is a narrow band for a resonance through the thin dielectric plate 2, f1 is a broadband because it is sandwiched resonate wide spacing of the ground plate 1 and the parasitic element 7. f1の有する広帯域性に対し、f0とf2を合わせる方法は、3層構造による広帯域化と同様の原理に基づくもので、3層と同程度の広帯域特性を実現できる。 To broadband property possessed by f1, a method of aligning the f0 and f2, based on the same principle as broadband by three-layer structure, it is possible to realize a three-layer and comparable broadband characteristics.

第2図は上記実施例の電気的特性を示す図であって、 Figure 2 is a diagram showing the electrical characteristics of the above embodiment,
(a)は反射量と周波数の関係を示しており、(b)はインピーダンスの周波数特性を示している。 (A) shows the relationship between the reflection amount and frequency, shows (b) the frequency characteristic of the impedance. 反射量が− Amount of reflection -
14dB以下(VSWR<1.5)となる帯域で見ると、中心周波数のfcに対し0.9fcから1.07fcまで即ち0.17fcの17%の帯域を有しており、第6図に示した3層から成る構造の平面アンテナと等価な広帯域特性が実現されていることがわかる。 Looking at the band of 14dB or less (VSWR <1.5), with respect to fc the center frequency has a 17% band i.e. 0.17fc from 0.9fc to 1.07Fc, composed of three layers shown in FIG. 6 it can be seen that the planar antenna equivalent broadband characteristics of the structure is realized.

この時の、fcは900MHzで、f0=0.95fc,f1=0.99fc,f2 At this time, fc in the 900MHz, f0 = 0.95fc, f1 = 0.99fc, f2
=1.04fcであり、また、各部の寸法は誘電体板が厚さ6m = A 1.04Fc, also, the size of each part thickness 6m dielectric plate
mのBTレジン(比誘電率3.7)、給電素子は幅15mm、長さ m of BT resin (dielectric constant 3.7), the feed element has a width 15 mm, length
97mmで給電点位置が下端より30mm、無給電素子は幅10m 30mm feed point position is the lower end in 97 mm, parasitic element width 10m
m、長さ91mmであり、給電素子との間隔は5mmである。 m, a length of 91 mm, distance between the feed element is 5 mm.

また上方の無給電素子は幅40mm、長さ126mmで誘電体面から30mmの間隔で係着してある。 The upper parasitic element width 40 mm, it is then engaged wear length 30mm distance from the dielectric surface with 126 mm.

第8図に示す従来の1層構造の広帯域平面アンテナの例では、図中に示す給電素子および無給電素子の幅Wは波長の約1/3が必要であり、従って中心周波数fcが900MH In the example of wideband planar antenna of the conventional one-layer structure shown in FIG. 8, the width W of the feed element and the parasitic element shown in the figure are required approximately 1/3 of the wavelength, therefore the center frequency fc 900MH
zであればWは110mm程度となるから、無給電素子75の外側から無給電素子76の外側までの寸法は330mm以上という非常に大きなものとなっていた。 Since if z W is about 110 mm, the dimension from the outer parasitic elements 75 to the outside of the parasitic element 76 has been a large very that above 330 mm.

これに対し、本実施例の広帯域平面アンテナでは、上述のように給電素子の幅は15mm、無給電素子の幅は10m In contrast, in the wideband planar antenna of the present embodiment, the width of the feed element as described above 15 mm, the width of the parasitic element 10m
m、給電素子と無給電素子との間隔は5mmであるから無給電素子5の外側から無給電素子6の外側までの寸法Gは m, the dimension G of from spacing between the feed element and the parasitic element is 5mm from the outside of the parasitic element 5 to the outside of the passive element 6
45mmであり、本発明によれば、前記従来のものに比べて非常に小形に広帯域平面アンテナを構成できることが分かる。 Is 45 mm, according to the present invention, it is found that can be configured wideband planar antenna very small compared to that of the prior art.

第3図には、本アンテナの磁界面内の放射特性を示す。 The Figure 3 shows the radiation characteristics in the magnetic field surface of the antenna. アース板の幅は150mmとしている。 Width of the ground plate is set to 150mm. 全帯域に亘りアンテナの正面方向を中心とした対称性の良いビームが実現されており、第7図、第8図の構造で問題となっていたビームシフトは解消されている。 And good beam symmetry around the front direction of the antenna over the entire band is achieved, FIG. 7, the beam shift, which has been a structure in issue Figure 8 is eliminated.

第4図は本発明の他の実施例を示す図であって、第1 Figure 4 is a diagram showing another embodiment of the present invention, the first
図に示した実施例の無給電素子5,6と同一面の外側にf3 Outside the same plane and the parasitic element 5,6 of the embodiment shown in FIG f3
の共振周波数を有する短冊形の金属板9,10を添着せしめたものである。 In which was allowed impregnated strip-shaped metal plates 9 and 10 having a resonant frequency of.

本実施例の平面アンテナでは同図(b)に示すように、f3をf2に近接して帯域の外側に来るように設定することにより、先の実施例に較べ、一層の広帯域化が可能となる。 As the planar antenna of the present embodiment shown in FIG. (B), by setting the f3 to come outside of the band in proximity to f2, compared with the previous embodiment, and it can be further widened Become.

以上の実施例では、無給電素子の形状を総て短冊形のものを示しているが、これらは短冊形に限定されるものではなく例えば、第5図(a),(b)の11〜14に示すような形状のものでも良く、所定の周波数を満足し得るものであれば、如何なる形状のものであっても良い。 In the above embodiment, although the shape of the parasitic element indicates what all strip shaped, these are for example not limited to strip-shaped, FIG. 5 (a),. 11 to the (b) it may be of a shape as shown in 14, so long as it can satisfy a predetermined frequency may be of any shape.

〔発明の効果〕 〔Effect of the invention〕

以上述べたように、本発明によれば、給電素子と同一面に複数個の無給電素子を配置することにより2層分の共振特性を実現でき、2層構造の平面アンテナにも拘わらず3層構造に匹敵する広帯域特性を達成できる利点がある。 As described above, according to the present invention, by arranging a plurality of parasitic elements flush with the feed element can be realized resonance characteristics of the two layers, 3 despite planar antenna having a two-layer structure an advantage of achieving wideband characteristics comparable to the layer structure.

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

第1図は本発明の一実施例を示す図、第2図は実施例の電気的特性を示す図、第3図は実施例の広帯域平面アンテナの磁界面内の放射特性を示す図、第4図は本発明の他の実施例を示す図、第5図は無給電素子の形状を短冊形以外のものとした例を示す図、第6図は従来の3層構造の広帯域平面アンテナの例を示す図、第7図は従来の1層構造の広帯域平面アンテナの例を示す図、第8図は従来の1層構造の広帯域平面アンテナの他の例を示す図である。 Diagram showing an embodiment of FIG. 1 according to the present invention, FIG. FIG. 2 showing electric characteristics of the example, FIG. 3 is a diagram showing the radiation characteristics in the magnetic field surface of the wideband planar antenna of embodiment, the 4 Figure is a diagram showing another embodiment of the present invention, FIG. 5 is a diagram showing an example in which the shape of the passive element and the other than the thin and long, FIG. 6 is a wideband planar antenna of the conventional three-layer structure shows an example, FIG. FIG. 7 is showing an example of a wideband planar antenna of the conventional one-layer structure, FIG. 8 is a diagram showing another example of a wideband planar antenna of the conventional one-layer structure. 1……金属板、2……誘電体板、3……放射素子、4… 1 ...... metal plate, 2 ...... dielectric plate, 3 ...... radiating element, 4 ...
…給電点、5,6,9〜14……無給電素子 ... feed point, 5,6,9~14 ...... parasitic element

───────────────────────────────────────────────────── フロントページの続き (72)発明者 木島 誠 東京都千代田区内幸町1丁目1番6号 日本電信電話株式会社内 (72)発明者 木村 英章 東京都千代田区内幸町1丁目1番6号 日本電信電話株式会社内 (56)参考文献 特開 昭63−88904(JP,A) 実開 平4−27609(JP,U) テレビジョン学会誌 Vol. ────────────────────────────────────────────────── ─── of the front page continued (72) inventor Makoto Kijima, Chiyoda-ku, tokyo Uchisaiwaicho 1 chome No. 6 Nippon Telegraph and Telephone Corporation within (72) inventor Kimura, Hideaki, Chiyoda-ku, tokyo Uchisaiwaicho 1 chome No. 6 Nippon Telegraph and Telephone Corporation within (56) reference Patent Sho 63-88904 (JP, a) JitsuHiraku flat 4-27609 (JP, U) television Journal Vol. 38,N o. 38, N o. 11.1984,pp. 11.1984, pp. 976−984 (58)調査した分野(Int.Cl. 7 ,DB名) H01Q 13/08 JOIS 976-984 (58) investigated the field (Int.Cl. 7, DB name) H01Q 13/08 JOIS

Claims (1)

    (57)【特許請求の範囲】 (57) [the claims]
  1. 【請求項1】平面の金属板からなるアース板の前面に誘電体板をはさんで、短冊形状の金属平板の給電素子(A)を該給電素子と前記アース板の面とが平行と成るように配置し、更にその前面に1つの金属平板の導波素子(B)を有する平面アンテナにおいて、 給電素子と同一面に、金属平板(C)を複数個、給電素子に対して対称となるように配置し、 前記導波素子(B)の共振周波数が前記給電素子(A) 1. A across the front of the ground plate made of a flat metal plate a dielectric plate, the feed element of the flat metal strip shape (A) and the surface of the ground plate and the power feed element becomes a parallel place manner, yet the planar antenna having a waveguide element (B) of one of the flat metal plate in front, on the same plane and the feed element, a symmetric flat metal plate (C) is a plurality, relative feed element place manner, the waveguide element resonant frequency the feeding element (B) (a)
    及び前記金属平板(C)の各共振周波数のうち最高周波数と最低周波数の間に設定したことを特徴とする、広帯域平面アンテナ。 And is characterized in that set between the highest and lowest frequencies of said resonance frequencies of the flat metal (C), wideband planar antenna.
JP2283737A 1990-10-22 1990-10-22 Wideband planar antenna Expired - Lifetime JP3006867B2 (en)

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JP3006867B2 true JP3006867B2 (en) 2000-02-07

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US7315283B2 (en) 2006-04-06 2008-01-01 Tatung Company Dual-band circularly polarized antenna

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JP2806350B2 (en) * 1996-03-14 1998-09-30 日本電気株式会社 Patch type array antenna system
KR100781933B1 (en) * 2005-12-16 2007-12-04 주식회사 이엠따블유안테나 Single layer dual band antenna with circular polarization and single feed point
WO2009013817A1 (en) 2007-07-25 2009-01-29 Fujitsu Limited Wireless tag
JP5310552B2 (en) * 2007-07-25 2013-10-09 富士通株式会社 Wireless tag and manufacturing method thereof
KR101032029B1 (en) * 2008-03-31 2011-05-02 주식회사 이엠따블유 Wide-band Printed-Monopole Antenna using parasitic elements
JP5788548B2 (en) * 2014-03-03 2015-09-30 株式会社フジクラ microstrip antenna

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Title
テレビジョン学会誌 Vol.38,No.11.1984,pp.976−984

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7315283B2 (en) 2006-04-06 2008-01-01 Tatung Company Dual-band circularly polarized antenna

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