JP2002084122A - Compact antenna - Google Patents
Compact antennaInfo
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- JP2002084122A JP2002084122A JP2000271272A JP2000271272A JP2002084122A JP 2002084122 A JP2002084122 A JP 2002084122A JP 2000271272 A JP2000271272 A JP 2000271272A JP 2000271272 A JP2000271272 A JP 2000271272A JP 2002084122 A JP2002084122 A JP 2002084122A
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- antenna
- conductor
- cylinder
- small
- winding
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Abstract
Description
【０００１】[0001]
【発明が属する技術分野】本発明は、外形寸法が波長の
１/１０以下、かつ多偏波・多周波の放射を有する小型ア
ンテナに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small antenna having an external dimension of 1/10 or less of a wavelength and having multi-polarization and multi-frequency radiation.
【０００２】[0002]
【従来の技術】移動体通信の基地局、移動局に使用され
るアンテナは小型、軽量、電気的には高利得が要求され
る。しかし、アンテナを小型にすると必然的に利得の減
少、狭帯域化を生じる結果となる。また、波長に比して
アンテナ高さを減じると垂直偏波のレベルが減少する。
先に、波長に比して外形寸法が小さく、構造が単純な小
型アンテナが提案されている（特開平１１−１５０４１
２号）。このアンテナの放射指向性は１波長ループアン
テナと同等で、ほぼ直線偏波を放射しアンテナを含む面
内で８の字特性を有し、アンテナ給電部を含む直交した
面内で無指向性となる。このアンテナを移動体に対して
平らに装着すると水平偏波の放射が優勢となり、通常用
いられている移動体通信の垂直偏波の送信・受信には適
用出来ない。また、給電部を下側にして移動体や反射板
上に設置すると水平偏波を放射する。このアンテナを垂
直偏波通信に適用するには、アンテナ給電部を横向きに
して移動体に対して垂直に設置する必要があり、構造
上、機械強度に問題があり、かつ装着が困難となる。2. Description of the Related Art Antennas used in mobile communication base stations and mobile stations are required to be small, light, and electrically high gain. However, reducing the size of the antenna necessarily results in a decrease in gain and a narrower band. Also, reducing the antenna height relative to the wavelength reduces the level of vertically polarized waves.
First, a small antenna having a small external size and a simple structure compared to the wavelength has been proposed (JP-A-11-15041).
No. 2). The radiation directivity of this antenna is the same as that of a one-wavelength loop antenna, radiates almost linearly polarized waves, has a figure-eight characteristic in the plane including the antenna, and is non-directional in the orthogonal plane including the antenna feed section. Become. When this antenna is mounted flat on a mobile object, the emission of horizontally polarized waves becomes predominant, and the antenna cannot be applied to the transmission and reception of vertically polarized waves in mobile communication used in general. Further, when the power supply unit is placed on a moving body or a reflecting plate with the power supply unit being on the lower side, horizontally polarized waves are radiated. In order to apply this antenna to vertically polarized wave communication, it is necessary to install the antenna vertically with respect to the moving body with the antenna feed section sideways, which causes a structural problem in mechanical strength and makes it difficult to mount the antenna.
【０００３】[0003]
【発明が解決しようとする課題】この発明は以上のよう
な問題点に鑑みてなされたものであって、その目的は上
記の要求を満足する低姿勢かつ多偏波発生の小型・計
量、高利得アンテナを提供することにある。SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has as its object to provide a small-sized, low-profile, multi-polarization, high-power, and low-power generator that satisfies the above-mentioned requirements. It is to provide a gain antenna.
【０００４】[0004]
【課題を解決するための手段】本願の請求項１に係る発
明は、ヘリカル状のアンテナ導体を有する小型アンテナ
において、仮想筒状部の一側壁面においてヘリカル状に
配置された１側アンテナ導体を間隔を保持して複数個設
けるとともに、仮想筒状部の他側壁面に配置され前記各
１側アンテナ導体の巻き終わりとこれら１側アンテナ導
体に隣る他の１側アンテナ導体の巻き初めとを接続する
他側アンテナ導体を設け、切り離された１側アンテナ導
体の巻き初めとこれに隣る１側アンテナ導体の巻き終わ
りから延びる他側アンテナ導体間を給電点とすることを
特徴とする小型アンテナを提供する。本願の請求項２に
係る発明は、請求項１に係る発明において、前記仮想筒
状部は円筒形状であることを特徴とする小型アンテナを
提供する。本願の請求項３に係る発明は、請求項１に係
る発明において、前記仮想筒状部は多角形の筒状である
ことを特徴とする小型アンテナを提供する。本願の請求
項４に係る発明は、請求項１に係る発明において、前記
仮想筒状部には絶縁物が満たされていることを特徴とす
る小型アンテナを提供する。本願の請求項５に係る発明
は、請求項４に係る発明において、前記１側アンテナ導
体と他側アンテナ導体の少なくとも一方は前記絶縁物に
プリントにより形成されていることを特徴とする小型ア
ンテナを提供する。The invention according to claim 1 of the present application is directed to a small antenna having a helical antenna conductor, wherein the one-side antenna conductor arranged helically on one side wall surface of the virtual tubular portion is provided. A plurality of the first antenna conductors are disposed on the other side wall surface of the virtual tubular portion while maintaining the interval, and the winding end of each of the one-side antenna conductors and the winding start of the other one-side antenna conductor adjacent to the one-side antenna conductor are determined. A small-sized antenna having a connected other-side antenna conductor, and having a feeding point between the other-side antenna conductor extending from the winding start of the separated one-side antenna conductor and the winding end of the adjacent one-side antenna conductor. I will provide a. The invention according to claim 2 of the present application provides the small antenna according to claim 1, wherein the virtual tubular portion has a cylindrical shape. The invention according to claim 3 of the present application provides the small antenna according to claim 1, wherein the virtual tubular portion is a polygonal tubular shape. The invention according to claim 4 of the present application provides the small antenna according to claim 1, wherein the virtual cylindrical portion is filled with an insulator. The invention according to claim 5 of the present application is the invention according to claim 4, wherein at least one of the first antenna conductor and the other antenna conductor is formed by printing on the insulator. provide.
【０００５】[0005]
【発明の実施の形態】次に、本発明を、図面を用いて詳
細に説明する。本発明は、本質的にボビンとなる巻き枠
は必要ないが、これを用いることができる。次に絶縁物
からなる円筒状の巻き枠を用いた実施の形態についてま
ず説明する。図１は、本発明に係る小型アンテナの斜視
図である。図１に示すように、本発明の小型アンテナ
は、厚みを有する絶縁物からなる円筒状の巻き枠１の外
側（一側壁面）に、導線またはリボン状導体からなる１
側アンテナ導体２を巻き枠１下部を始点３としてその長
さ方向にスパイラル状に巻き枠１上端点４まで１ターン
で巻き上げる。Next, the present invention will be described in detail with reference to the drawings. The present invention does not require a bobbin that is essentially a bobbin, but it can be used. Next, an embodiment using a cylindrical winding frame made of an insulator will be described first. FIG. 1 is a perspective view of a small antenna according to the present invention. As shown in FIG. 1, the small antenna according to the present invention includes a cylindrical winding 1 made of a thick insulator, and a wire or ribbon-shaped conductor formed on the outside (one side wall surface).
The side antenna conductor 2 is wound in a spiral manner in a length direction to the upper end point 4 of the winding frame 1 in one turn with the lower portion of the winding frame 1 as a starting point 3.
【０００６】ここで１側アンテナ導体２を巻き枠１の内
側（他側壁面）に上部折り曲げ部分５として折り曲げ、
巻き枠１の内壁に沿って巻き枠内周の１／８だけ巻き初
めの始点１からずれた点まで斜めに内側折り曲げ部（他
側アンテナ導体）６として下端へ引き下ろし、巻き枠下
部で再び下部折り曲げ部分７として折り曲げ、巻き枠１
の一側壁面へ向けて引き出し、さらにこの始点８から上
記と同様巻き枠１の外周（一側壁面）に沿ってもう１つ
の１側アンテナ導体９をスパイラル状に巻き上げるとい
う巻き方を繰り返し、結果的に全周で８回のスパイラル
状アンテナ導体を有する小型アンテナを構成する。そし
て、１側アンテナ導体２の始点３と最後の他側アンテナ
導体１０の巻き終わり端１１間は切り離されていて、こ
の間をアンテナの給電点とすることができ、例えば、同
軸ケーブル１２を接続することができる。[0006] Here, the one-side antenna conductor 2 is bent inside the winding frame 1 (the other side wall surface) as an upper bent portion 5,
Along the inner wall of the winding frame 1, it is diagonally pulled down to the lower end as an inner bent portion (other-side antenna conductor) 6 to a point shifted from the starting point 1 at the beginning of winding by ８ of the inner circumference of the winding frame. Folded as winding part 7 and reel 1
And the other one-side antenna conductor 9 is spirally wound along the outer periphery (one side wall surface) of the winding frame 1 from the starting point 8 in the same manner as described above. A small antenna having eight spiral antenna conductors around the entire circumference is constructed. The starting point 3 of the one-side antenna conductor 2 and the winding end 11 of the last other-side antenna conductor 10 are separated from each other and can be used as a feeding point of the antenna. For example, a coaxial cable 12 is connected. be able to.
【０００７】本発明において、アンテナ導体２の１回巻
きに注目すると、これは波長に比して小さい直径のノー
マルモードヘリカルアンテナと見なすことが出来る。ノ
ーマルモードヘリカルアンテナは、その直径とピッチ角
を適当に選ぶことにより、円偏波を放射することが知ら
れている。すなわち、本発明のアンテナはこのノーマル
モードヘリカルアンテナを８本縦続接続したアンテナと
解釈出来る。したがって、このアンテナ全長が１波長あ
るいは波長の整数倍に近いとき、共振が起こる。このと
き、アンテナ導体上の電流分布は定在波状となって、そ
れらの電流素子からの合成で放射が起こる。これらの共
振点においてアンテナ寸法は波長に比して小さいため、
通常の波長程度のアンテナとは異なり、放射指向性は単
純なものとなり、全方向性に近いものとなる。本発明の
アンテナはピッチ角が大きいことにより、垂直偏波が優
勢となる。また、このアンテナを金属製移動体に装着し
たときその構造の軸対称性のゆえに機械強度を取りやす
く、電気的には金属が反射板の効果を生じ、アンテナか
ら放射される垂直偏波成分は映像効果で倍加される。す
なわち、比較的低姿勢でありながら垂直放射の期待出来
るアンテナが実現出来る。In the present invention, focusing on the single turn of the antenna conductor 2, this can be regarded as a normal mode helical antenna having a diameter smaller than the wavelength. It is known that a normal mode helical antenna emits circularly polarized waves by appropriately selecting its diameter and pitch angle. That is, the antenna of the present invention can be interpreted as an antenna in which eight normal mode helical antennas are cascaded. Therefore, when the entire length of the antenna is close to one wavelength or an integral multiple of the wavelength, resonance occurs. At this time, the current distribution on the antenna conductor becomes a standing wave, and radiation is generated by combining the current elements. At these resonance points, the antenna dimensions are smaller than the wavelength,
Unlike an antenna having a normal wavelength, the radiation directivity is simple and close to omnidirectional. The antenna of the present invention has a large pitch angle, so that vertical polarization becomes dominant. In addition, when this antenna is mounted on a metal moving body, mechanical strength is easily obtained due to the axial symmetry of the structure, the metal electrically acts as a reflector, and the vertical polarization component radiated from the antenna is Doubled with visual effects. That is, an antenna that can be expected to emit vertical radiation while having a relatively low attitude can be realized.
【０００８】[0008]
【実施例】(実施例１)上述のごとく、本発明のアンテナ
は複数の周波数で共振を起こす。その基本周波数である
アンテナ導体全長約１波長の場合につき説明する。図１
に示す構造のアンテナを全長L=２メートルの導線で試作
した。アンテナの巻き枠１は発泡スチロール製で、その
高さ：７５ｍｍ、巻き枠外径：４０ｍｍ、巻き枠内径：
２０ｍｍである。このときの基本共振周波数は、 ｆreso＝Ｃ ／Ｌ＝３ｘ１０8／２ｍ＝１５０ＭＨz である。(Embodiment 1) As described above, the antenna of the present invention resonates at a plurality of frequencies. The case where the total length of the antenna conductor is about one wavelength, which is the fundamental frequency, will be described. FIG.
An antenna having the structure shown in Fig. 1 was prototyped with a conductor having a total length of L = 2 meters. The winding frame 1 of the antenna is made of polystyrene foam, and its height: 75 mm, outer diameter of the winding frame: 40 mm, inner diameter of the winding frame:
20 mm. The basic resonance frequency at this time is freso = C / L = 3 × 10 8 / 2m = 150 MHz.
【０００９】図２は基本周波数でのリターンロス特性を
示し、１１８ＭＨＺで−１０ｄＢｉ以下の整合がとれて
いる。このアンテナ単体の放射指向性は図３に示す水平
面内で最大放射（実線、垂直から１０度傾いた偏波）が
ほぼ無指向性を示し、垂直面内で給電点を含む面内（図
４）、および給電点と直行する面内（図５）はともにほ
ぼ無指向性を示す。また、この周波数における実測利得
は−７ｄＢi であった。このときのアンテナ外形寸法は
波長の約１/３３と非常に小型でありながら、高い利得
を示した。金属移動体に取り付けて使用すると、その映
像効果でさらなる利得の増加を期待出来る。すなわち、
本発明のアンテナは、波長に比して十分小型でありなが
ら、波長あるいは波長以上の寸法を有する移動体その他
に装着することにより、移動体自体をアンテナとして励
振する一種の寄生アンテナとも解釈出来る。FIG. 2 shows a return loss characteristic at a fundamental frequency, and a matching of -10 dBi or less is achieved at 118 MHZ. As for the radiation directivity of this antenna unit, the maximum radiation (solid line, polarized wave inclined at 10 degrees from the vertical) shows almost no directivity in the horizontal plane shown in FIG. 3, and the radiation directivity in the plane including the feeding point in the vertical plane (FIG. ) And the plane perpendicular to the feed point (FIG. 5) show almost no directivity. The measured gain at this frequency was -7 dBi. The external dimensions of the antenna at this time were very small, about 1/33 of the wavelength, and showed high gain. If it is used by attaching it to a metal moving object, it can be expected that the gain will be further increased by the image effect. That is,
The antenna of the present invention can be interpreted as a kind of parasitic antenna, which is sufficiently small in comparison with the wavelength, but is mounted on a moving object or the like having a wavelength or a size larger than the wavelength to excite the moving object itself as an antenna.
【００１０】前述のごとく、本発明のアンテナは基本周
波数の整数倍に近い周波数で共振する。このときもその
外形寸法は波長に比して小さいことより、小型アンテナ
として実用に適す。As described above, the antenna of the present invention resonates at a frequency close to an integral multiple of the fundamental frequency. At this time, the outer dimensions are smaller than the wavelength, so that the antenna is suitable for practical use as a small antenna.
【００１１】図６は基本周波数の約２倍、および４倍に
近い周波数でのリターンロス特性を示す。図６から周波
数：ｆ2 ＝２９０ＭＨｚ、ｆ4 ＝４３０ＭＨｚでともに
リターンロスが−１０ｄＢｉ以下を示し、何ら整合回路
を付加することなく５０Ω給電線と整合が得られる。ま
た、この周波数における実測利得はともに約−６ｄＢｉ
と十分実用に供しうる値を示した。FIG. 6 shows return loss characteristics at frequencies approximately twice and four times the fundamental frequency. Frequency From Figure 6: f 2 = 290MHz, f 4 = both return loss at 430MHz showed the following -10dBi, 50Ω feeder line and the matching can be obtained without any addition of the matching circuit. The measured gain at this frequency is about -6 dBi.
And a value practically usable.
【００１２】図７はｆ2 における水平面内での垂直偏波
(実線)および給電点と直行した垂直面内指向性(点線)を
示した。本アンテナは、先の基本周波数におけると同じ
く垂直偏波の放射が優勢であるが、水平偏波との差は約
６ｄＢと比較的少なく、図では水平偏波の指向性は省略
した。結果より、水平面内無指向性、垂直面内は水平面
より多少傾いた方向に最大放射が認められるが、無指向
性に近いものが得られている。給電点を含む面内の指向
性も同様の結果が得られている。FIG. 7 shows the vertical polarization in the horizontal plane at f 2 .
(Solid line) and the in-plane directivity (dotted line) perpendicular to the feeding point are shown. In this antenna, the radiation of the vertically polarized wave is dominant as in the case of the fundamental frequency described above, but the difference from the horizontally polarized wave is relatively small, about 6 dB, and the directivity of the horizontally polarized wave is omitted in the figure. According to the results, omnidirectionality in the horizontal plane and maximum radiation in a direction slightly inclined from the horizontal plane in the vertical plane are recognized, but those near omnidirectionality are obtained. Similar results are obtained for the in-plane directivity including the feeding point.
【００１３】図８はｆ4 における水平面内での垂直偏波
(実線)および給電点と直行した面内(点線)の指向性を示
す。水平面内では無指向性、垂直面内では、水平面に最
大放射を有する繭型の放射が認められ、ｆ2 とほぼ同様
の全方向性を確保しており、この時の外形寸法は波長の
約１/９と小型アンテナの部類に入る。FIG. 8 shows the vertical polarization in the horizontal plane at f 4 .
(Solid line) and directivity in a plane (dotted line) perpendicular to the feeding point. In the horizontal plane omni-directional, in the vertical plane, observed radiation cocoon having a maximum radiation in the horizontal plane, has secured substantially the same omnidirectional and f 2, outer dimensions at this time about the wavelength It is in the category of 1/9 and small antenna.
【００１４】以上、本発明を上述の実施の形態により説
明したが、本発明は本質的にボビンとなる巻き枠は必要
なく、アンテナ導体が特許請求の範囲に定義された形状
を保持している限り本発明の範囲である。また、本発明
の小型アンテナは、円筒形状でなくともよく、３角形、
４角形、５角形等の多角形の筒状を呈していても良い。
更に、１側アンテナ導体は他側アンテナ導体の外側に位
置していなくともよく、その内側に位置していても良
い。このほか、アンテナ導体は、巻き枠の内面或いは外
面にプリント配線技術により形成しても良い。このよう
に、本発明の主旨の範囲内で種々の変形や応用が可能で
あり、これらの変形や応用を本発明の範囲から排除する
ものではない。Although the present invention has been described with reference to the above-described embodiment, the present invention does not essentially require a bobbin winding frame, and the antenna conductor has the shape defined in the claims. As long as it is within the scope of the present invention. In addition, the small antenna of the present invention does not need to have a cylindrical shape, and may have a triangular shape,
It may have a polygonal cylindrical shape such as a quadrangle or a pentagon.
Further, the one-side antenna conductor need not be located outside the other-side antenna conductor, but may be located inside. In addition, the antenna conductor may be formed on the inner surface or outer surface of the winding frame by a printed wiring technique. As described above, various modifications and applications are possible within the scope of the gist of the present invention, and these modifications and applications are not excluded from the scope of the present invention.
【００１５】[0015]
【発明の効果】以上詳細に説明したように、本発明の小
型アレイアンテナは基本周波数において外形寸法が１/
３３波長と非常に小型でありながら、利得：−７ｄＢｉ
と高い利得を有することより、移動局小型アンテナとし
て広い適用分野を有する。また、本発明のアンテナは、
その基本周波数の約整数倍に共振点を有し、アンテナと
して良好に動作することより、移動体通信における２な
いし３周波数共用アンテナとしての利用にも適してい
る。As described in detail above, the small-sized array antenna of the present invention has an outer dimension of 1 /
Gain: -7dBi despite its very small size of 33 wavelengths
With such a high gain, it has a wide field of application as a small mobile station antenna. Further, the antenna of the present invention
Since it has a resonance point at about an integral multiple of its fundamental frequency and operates well as an antenna, it is suitable for use as a two or three frequency shared antenna in mobile communication.
【図１】図１は、本発明の小型アンテナ構造図である。FIG. 1 is a structural diagram of a small antenna of the present invention.
【図２】図２は、基本周波数近傍のリターンロス特性を
示す特性図である。FIG. 2 is a characteristic diagram illustrating a return loss characteristic near a fundamental frequency.
【図３】図３は、本発明の小型アンテナ放射指向性を示
す特性図で、その水平面内指向性（Ｘ−Ｙ面）を示す特
性図ある。FIG. 3 is a characteristic diagram showing the radiation directivity of a small antenna according to the present invention, and is a characteristic diagram showing its directivity in a horizontal plane (XY plane).
【図４】図４は、本発明の小型アンテナ放射指向性を示
す特性図で、その水平面内指向性（Ｘ−Ｚ面）を示す特
性図である。FIG. 4 is a characteristic diagram showing radiation directivity of a small antenna according to the present invention, and is a characteristic diagram showing directivity in a horizontal plane (XZ plane).
【図５】図５は、本発明の小型アンテナ放射指向性を示
す特性図で、その水平面内指向性（Ｙ−Ｚ面）を示す特
性図である。FIG. 5 is a characteristic diagram showing the radiation directivity of the small antenna according to the present invention, and is a characteristic diagram showing the directivity in the horizontal plane (YZ plane).
【図６】図６は、高次共振周波数リターンロス特性を示
す特性図である。FIG. 6 is a characteristic diagram showing a high-order resonance frequency return loss characteristic.
【図７】図７は、ｆ2 ＝２９０ＭＨｚでの放射指向性を
示す特性図である。FIG. 7 is a characteristic diagram showing radiation directivity at f 2 = 290 MHz.
【図８】図８は、ｆ4 ＝４３０ＭＨｚでの放射指向性を
示す特性図である。FIG. 8 is a characteristic diagram showing radiation directivity at f 4 = 430 MHz.
１・・・・・巻き枠 ２・・・・・アンテナ導体 ３・・・・・始点 ４・・・・・上端点 ５・・・・・上部折り曲げ部分 ６・・・・・内側折り曲げ部 ７・・・・・下部折り曲げ部分 ８・・・・・始点 1 ····· Winding frame 2 ······ Antenna conductor 3 ······························································ Inwardly-bent portion 7 ..... Lower bent part 8 ... Start point
Claims (5)
ンテナにおいて、仮想筒状部の一側壁面においてヘリカ
ル状に配置された１側アンテナ導体を間隔を保持して複
数個設けるとともに、仮想筒状部の他側壁面に配置され
前記各１側アンテナ導体の巻き終わりとこれら１側アン
テナ導体に隣る他の１側アンテナ導体の巻き初めとを接
続する他側アンテナ導体を設け、切り離された１側アン
テナ導体の巻き初めとこれに隣る１側アンテナ導体の巻
き終わりから延びる他側アンテナ導体間を給電点とする
ことを特徴とする小型アンテナ。In a small antenna having a helical antenna conductor, a plurality of one-sided antenna conductors arranged in a helical shape on one side wall surface of a virtual cylindrical portion are provided at an interval, and the virtual cylindrical portion is provided. The other side antenna conductor which is arranged on the other side wall surface and connects the end of the winding of each of the one side antenna conductors and the beginning of the winding of the other one side antenna conductor adjacent to the one side antenna conductor is provided. A small antenna characterized in that a feeding point is provided between the beginning of winding of an antenna conductor and the other antenna conductor extending from the end of winding of one adjacent antenna conductor.
徴とする請求項１に記載の小型アンテナ。2. The small antenna according to claim 1, wherein the virtual tubular portion has a cylindrical shape.
を特徴とする請求項１に記載の小型アンテナ。3. The small antenna according to claim 1, wherein the virtual tubular portion is a polygonal tubular shape.
ることを特徴とする請求項１に記載の小型アンテナ。4. The small antenna according to claim 1, wherein the virtual tubular portion is filled with an insulator.
の少なくとも一方は前記絶縁物にプリントにより形成さ
れていることを特徴とする請求項４に記載の小型アンテ
ナ。5. The small antenna according to claim 4, wherein at least one of the first antenna conductor and the other antenna conductor is formed by printing on the insulator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000271272A JP3667612B2 (en) | 2000-09-07 | 2000-09-07 | Small antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000271272A JP3667612B2 (en) | 2000-09-07 | 2000-09-07 | Small antenna |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2002084122A true JP2002084122A (en) | 2002-03-22 |
| JP3667612B2 JP3667612B2 (en) | 2005-07-06 |
Family
ID=18757584
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000271272A Expired - Fee Related JP3667612B2 (en) | 2000-09-07 | 2000-09-07 | Small antenna |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3667612B2 (en) |
-
2000
- 2000-09-07 JP JP2000271272A patent/JP3667612B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP3667612B2 (en) | 2005-07-06 |
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