JPH0414304A - Stacked loop antenna - Google Patents
Stacked loop antennaInfo
- Publication number
- JPH0414304A JPH0414304A JP11791890A JP11791890A JPH0414304A JP H0414304 A JPH0414304 A JP H0414304A JP 11791890 A JP11791890 A JP 11791890A JP 11791890 A JP11791890 A JP 11791890A JP H0414304 A JPH0414304 A JP H0414304A
- Authority
- JP
- Japan
- Prior art keywords
- antenna
- loop
- conductors
- conductor
- reactance element
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000004020 conductor Substances 0.000 claims abstract description 72
- 230000005540 biological transmission Effects 0.000 abstract description 2
- 230000010363 phase shift Effects 0.000 abstract description 2
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 239000005357 flat glass Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- 238000013459 approach Methods 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 239000012212 insulator Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
Classifications
-
- 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
- H01Q1/1271—Supports; Mounting means for mounting on windscreens
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
Landscapes
- Details Of Aerials (AREA)
Abstract
Description
【発明の詳細な説明】
(産業上の利用分野)
本発明は、双ループアンテナに係り、特に自動車用の電
話アンテナとして窓ガラス等の絶縁体にプリントして形
成するアンテナに用いて好適なものである。DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a twin-loop antenna, and is particularly suitable for use in an antenna printed on an insulator such as a window glass as a telephone antenna for automobiles. It is.
自動車窓等に付設するUHF帯のアンテナとして、接地
導体に沿って左右両方向に半波長の半ループ状の一対の
導体素子を給電点から分岐させ、各導体素子の終端を接
地し、給電点に不平衡給電を行う構成の双ループ状アン
テナが知られている(特開昭62−69704号、米国
特許第4,721.964号)。As a UHF band antenna attached to a car window, etc., a pair of half-wavelength half-loop-shaped conductor elements are branched from the feed point in both left and right directions along a ground conductor, the terminal end of each conductor element is grounded, and the antenna is connected to the feed point. A twin-loop antenna configured to perform unbalanced power feeding is known (Japanese Patent Laid-Open No. 62-69704, US Pat. No. 4,721.964).
第11図は上述の双ループアンテナを自動車のリア窓ガ
ラスにプリントして形成した従来例を示す。FIG. 11 shows a conventional example in which the above-mentioned twin loop antenna is printed on the rear window glass of an automobile.
第11図において、1は例えば車載電話用の送受信アン
テナであり、リア窓ガラス2上に防曇用ヒータ線3及び
ラジオ用(FM/AM)アンテナ導体4と共にプリント
されている。送受信アンテナ1は、自動車のボディー5
に沿って設けられ、給電点6から左右に分岐した一対の
半ループ素子1a、1bを備える。素子1a、1bの終
端IC11dは接地され、給電点6には同軸線の給電ケ
ーブル7の芯線から不平衡給電される。In FIG. 11, reference numeral 1 denotes a transmitting/receiving antenna for, for example, a car-mounted telephone, which is printed on a rear window glass 2 together with an anti-fog heater wire 3 and a radio (FM/AM) antenna conductor 4. The transmitting/receiving antenna 1 is mounted on the body 5 of the automobile.
A pair of half-loop elements 1a and 1b are provided along the feed point 6 and branched left and right from the feed point 6. The terminal ICs 11d of the elements 1a and 1b are grounded, and unbalanced power is fed to the feed point 6 from the core wire of the coaxial feed cable 7.
この送受信アンテナ1は850〜950MHzのUHF
帯で良好なゲイン及び無指向に近い指向特性を示す。This transmitting/receiving antenna 1 has a UHF frequency of 850 to 950 MHz.
It shows good gain in the band and almost omnidirectional directional characteristics.
第11図に示す送受信アンテナ1は、自動車の側方から
の到来電波に対し指向特性に若干の落ち込みを有し、ま
た利得がポールアンテナ等と比べて幾分小さいと言った
欠点があった。The transmitting/receiving antenna 1 shown in FIG. 11 has disadvantages in that it has a slight drop in directivity with respect to radio waves arriving from the side of a car, and its gain is somewhat smaller than that of a pole antenna or the like.
本発明はこの問題を解消して、指向特性及び利得を改善
することを目的とする。The present invention aims to solve this problem and improve directivity and gain.
〔課題を解決するための手段]
本発明の双ループアンテナは、2つの連接したループ状
導体と、各ループの連結部に形成された給電点と、上記
各ループ状導体に負荷されたリアクタンス素子導体とか
ら成る。[Means for Solving the Problems] The twin-loop antenna of the present invention includes two connected loop-shaped conductors, a feeding point formed at the connecting portion of each loop, and a reactance element loaded on each of the loop-shaped conductors. It consists of a conductor.
(作用〕
給電点から見たアンテナのインピーダンスが、リアクタ
ンス素子導体の付加により純抵抗に近づく。従ってアン
テナと伝送ケーブルとの整合損失が軽減されて利得が向
上すると共に、ループ間の受信波の位相ずれが小さくな
り、ループの連接方向の指向性の落ち込みが補償されて
無指向に近づく。(Effect) The impedance of the antenna seen from the feed point approaches pure resistance by adding the reactance element conductor.Therefore, matching loss between the antenna and transmission cable is reduced and gain is improved, and the phase of the received wave between the loops is reduced. The deviation becomes smaller, the drop in directivity in the direction of loop connection is compensated for, and the directionality approaches omnidirectionality.
第1図は本発明の双ループアンテナの導体パターンを示
す。この導体パターンは絶縁面上に導電材を印刷したり
、或いは絶縁体中に導電線を埋め込んで形成することが
できる。この双ループアンテナは2つの接合した円形ル
ープ導体10a、10bを備え、その接合部分に形成さ
れた長さが約2mmの空隙11を挾んで一対の給電端子
部12a、12bが形成されている。これらの給電端子
部12a、12bの一方(例えば12a)が信号用にま
た他方がアース用に使用される。FIG. 1 shows the conductor pattern of the twin loop antenna of the present invention. This conductor pattern can be formed by printing a conductive material on an insulating surface or by embedding conductive wires in an insulator. This twin-loop antenna includes two joined circular loop conductors 10a and 10b, and a pair of power feeding terminal portions 12a and 12b are formed across a gap 11 having a length of about 2 mm formed at the joined portion. One of these power supply terminal portions 12a and 12b (for example, 12a) is used for a signal, and the other is used for grounding.
各ループ導体10a、10bの端子部12a、12bに
対して180’隔てた部分に、リアクタンス素子導体1
3a、13bが形成されている。A reactance element conductor 1 is placed at a portion 180' apart from the terminal portions 12a and 12b of each loop conductor 10a and 10b.
3a and 13b are formed.
各リアクタンス素子導体13a、13bは、ループ導体
10a、10bの一部を遠心方向にU字状に膨出させて
成り、ループ導体10a、10bの端子12a、12b
から見たアンテナインピーダンスのリアクタンス分を打
ち消して純抵抗に近づける作用を行う。Each reactance element conductor 13a, 13b is formed by bulging a part of the loop conductor 10a, 10b in a U-shape in the centrifugal direction, and the terminal 12a, 12b of the loop conductor 10a, 10b
It has the effect of canceling out the reactance component of the antenna impedance seen from the surface, making it close to pure resistance.
第1図のアンテナは、800〜900MHzの帯域で1
波長の双ループアンテナとして作動するように、ループ
導体10a、10bの半径が定められている。設計周波
数を900MHzとすると、1波長は333.3 mm
で、これはアンテナ導体を取付ける絶縁材の比誘電率ε
1により波長短縮を受ける。The antenna in Figure 1 has a frequency of 1
The radius of the loop conductors 10a, 10b is determined to operate as a wavelength twin loop antenna. If the design frequency is 900MHz, one wavelength is 333.3 mm
This is the relative dielectric constant ε of the insulating material to which the antenna conductor is attached.
1 causes the wavelength to be shortened.
絶縁材としてガラス(ε、 =3.0 )を使用すると
、短縮率は、
埃0.58
7−へ丁
で、短縮された波長は、
λ’ =333.3 Xo、58=192.5(am)
である。従ってループ導体10a、10bの半径を、
R= 192.5/2π=30.6(mm)とする。な
おこの実施例での導体幅は4.Otrmである。Using glass (ε, = 3.0) as the insulating material, the shortening factor is 0.58 7-h, and the shortened wavelength is λ' = 333.3 Xo, 58 = 192.5 ( am)
It is. Therefore, the radius of the loop conductors 10a and 10b is set to R=192.5/2π=30.6 (mm). Note that the conductor width in this example is 4. It is Otrm.
リアクタンス素子導体13a、13bの寸法は、U字チ
ャンネル形状の横幅を9.6 mmとし、また深さLを
端子12a、12bから見たリアクタンスが最小となる
ように決定する。第2図のスミスチャート及び定在波比
SWRのグラフは、L=25閣にしたときのインピーダ
ンス特性を示す。The dimensions of the reactance element conductors 13a and 13b are determined such that the width of the U-shaped channel is 9.6 mm and the depth L is such that the reactance seen from the terminals 12a and 12b is minimized. The Smith chart and standing wave ratio SWR graph in FIG. 2 show impedance characteristics when L=25.
また第3図に参考としてリアクタンス素子導体12a、
12bがない従来のアンテナパターンのスミスチャート
及びSWRのグラフを示す。Also, as a reference in FIG. 3, the reactance element conductor 12a,
12b shows a Smith chart and an SWR graph of a conventional antenna pattern without 12b.
第2図と第3図との対比から判るように、リアクタンス
素子導体13a、13bを付加すると、特性インピーダ
ンスZ、=50Ω(正規化インピーダンスZ/Z、 =
1.0)に近いアンテナインピーダンスが820〜94
0MHzの帯域で得られる。As can be seen from the comparison between FIG. 2 and FIG. 3, when the reactance element conductors 13a and 13b are added, the characteristic impedance Z, = 50Ω (normalized impedance Z/Z, =
Antenna impedance close to 1.0) is 820-94
Obtained in the 0MHz band.
また車載電話の受信周波数帯850〜940MHz及び
送信周波数帯910〜940MHzにおいては、SWR
が1.5以下であり、従来(第3図)よりもフィーダケ
ーブルとの整合性が改善されていることが判る。In addition, in the receiving frequency band of 850 to 940 MHz and the transmitting frequency band of 910 to 940 MHz of the car phone, SWR
is 1.5 or less, and it can be seen that the consistency with the feeder cable is improved compared to the conventional method (FIG. 3).
第4図に第1図に示したアンテナ導体の指向特性を示し
、第5図にリアクタンス素子導体13a、13bを付け
ない従来のアンテナ導体の指向特性を示す。第4図と第
5図の対比から判るように、実施例のアンテナ導体は、
特に進行方向側方の利得が改善され、はぼ無指向に近い
指向特性を持っている。なお、第4図、第5図において
、利得の基準OdBはダイポールアンテナであり、また
垂直偏波について測定した。FIG. 4 shows the directional characteristics of the antenna conductor shown in FIG. 1, and FIG. 5 shows the directional characteristics of a conventional antenna conductor without reactance element conductors 13a and 13b. As can be seen from the comparison between FIG. 4 and FIG. 5, the antenna conductor of the example is
In particular, the gain on the sides in the direction of travel has been improved, and the beam has a directional characteristic that is almost omnidirectional. Note that in FIGS. 4 and 5, the reference gain OdB is a dipole antenna, and measurements were made for vertical polarization.
また第6図は実施例のアンテナ導体の水平面内(0〜3
60°)の平均利得の周波数特性(点線)及びリアクタ
ンス素子導体13a、13bの無い従来のアンテナパタ
ーンの周波数特性(−点鎖線)を示す。図から判るよう
に実施例のアンテナパターンは、800〜960MHz
の帯域で平均利得が約2dBはど従来例より改善されて
いる。なお、第6図のグラフの基準(OdB)はダイポ
ールアンテナであり、垂直偏波で測定した。Moreover, FIG. 6 shows the horizontal plane (0 to 3
60°) (dotted line) and the frequency characteristic of a conventional antenna pattern without reactance element conductors 13a and 13b (-dotted chain line). As can be seen from the figure, the antenna pattern of the example is 800 to 960 MHz.
The average gain in this band is about 2 dB, which is an improvement over the conventional example. Note that the standard (OdB) for the graph in FIG. 6 is a dipole antenna, and measurements were made using vertically polarized waves.
第2図、第4図、第6図に示すように、実施例の双ルー
プアンテナの利得及び指向性が改善されているのは、給
電ケーブルとの整合性が良くなって整合損失が軽減され
たのと、左右のループの受信波の位相ずれが少なくなっ
たためである。As shown in Figures 2, 4, and 6, the gain and directivity of the twin loop antenna of the example are improved because the matching with the feeding cable is improved and matching loss is reduced. This is because the phase shift between the received waves of the left and right loops has become smaller.
第1図に示した双ループアンテナは、上半分と下半分と
が対称形状であるので、片半分のみを使用して鏡像アン
テナとして作動させることができる。この場合には、第
7図に示すように、自動車のガラス2の面上に、接地電
位であるボディー5に近接して第1図の上半分の半ルー
プ導体10a、10b及びL字状リアクタンス素子導体
13a、13bを配置し、リアクタンス素子導体13a
、13bの終端に端子14a、14bを設けてこれを接
地すると共に、半ループ導体10a、10bの接合点の
給電端子部12aに同軸給電ケーブル7の芯線を接続す
る。なお第7図の例においても、従来の第11図と同様
にヒータ線3及びラジオ用アンテナ導体3をガラス2の
面上に形成してもよい。Since the twin loop antenna shown in FIG. 1 has a symmetrical top and bottom half, it can be operated as a mirror antenna using only one half. In this case, as shown in FIG. 7, the half-loop conductors 10a, 10b and the L-shaped reactance in the upper half of FIG. Element conductors 13a and 13b are arranged, and reactance element conductor 13a
, 13b are provided and grounded, and the core wire of the coaxial power supply cable 7 is connected to the power supply terminal portion 12a at the junction of the half-loop conductors 10a, 10b. In the example shown in FIG. 7 as well, the heater wire 3 and the radio antenna conductor 3 may be formed on the surface of the glass 2 as in the conventional case shown in FIG.
更に第8図に示すように、半ループ導体10a、10b
及びL字状リアクタンス素子導体13a、13bと共に
接地ライン15をガラス面上にプリントで形成し、この
接地ライン15にL字状リアクタンス素子導体13a、
13bの各終端を結合すると共に、給電ケーブル7の外
側導体(接地)を結合するような導体配置も可能である
。Furthermore, as shown in FIG. 8, half-loop conductors 10a, 10b
A ground line 15 is formed by printing on the glass surface together with the L-shaped reactance element conductors 13a and 13b, and the L-shaped reactance element conductor 13a,
It is also possible to arrange the conductors such that each terminal end of the power supply cable 13b is coupled together with the outer conductor (ground) of the power supply cable 7.
また第9図に示すように、複数の半ループ導体10a、
10bを連結させて、その終端にL字状リアクタンス素
子導体13a、13bを付加してもよい。また第10図
に示すように、半ループ導体10a、10bの間に直線
導体16を挿入して、半ループ導体10a、10bを左
右に離してもよい。直線導体16の長さは波長の1/2
の整数倍が良い。Further, as shown in FIG. 9, a plurality of half-loop conductors 10a,
10b may be connected and L-shaped reactance element conductors 13a and 13b may be added to the ends thereof. Alternatively, as shown in FIG. 10, a straight conductor 16 may be inserted between the half-loop conductors 10a and 10b, and the half-loop conductors 10a and 10b may be separated to the left and right. The length of the straight conductor 16 is 1/2 of the wavelength
An integer multiple of is good.
なお上述の各側では、ループ導体10a、10bは円又
は半円であるが、多角形でもよい。Note that on each side described above, the loop conductors 10a, 10b are circular or semicircular, but may be polygonal.
本発明は上述のように双ループアンテナの各ループ導体
にリアクタンス素子導体を付加して、アンテナインピー
ダンスを純抵抗に近づけるようにしたので、比較的単純
で占有面積が小さいアンテナパターンでも良好な利得及
び無指向性能が得られる。As described above, the present invention adds a reactance element conductor to each loop conductor of the twin-loop antenna to make the antenna impedance close to pure resistance, so even a relatively simple antenna pattern occupying a small area can achieve good gain and Provides omnidirectional performance.
第1図は本発明の双ループアンテナの一実施例を示す導
体パターン図、第2図は第1図のアンテナのインピーダ
ンス特性を示すスミスチャート及びSWRのグラフ、第
3図は第2図に対応する従来の双ループアンテナのイン
ピーダンス特性図、第4図は第1図のアンテナの指向特
性図、第5図は従来の双ループアンテナの指向特性図、
第6図は第1図のアンテナ及び従来のアンテナの利得−
周波数特性のグラフ、第7図〜第10図は鏡像アンテナ
の例を示す自動車の窓ガラス面の導体を示す図、第11
図は従来の自動車用窓ガラスアンテナの導体配置を示す
図である。
なお図面に用いた符号において、
2・・−−−−一−−−−−−−−−−−−リア窓ガラ
ス3−=−−−−−−−−−−−−−・−ヒータ線4−
・−−−−−−−−−・−一−−−ラジオ用アンテナ5
−−−−−一・−・−・−・−ボディ7−−−−−−−
−一・−−−一−−−−・給電ケーブル10a、 10
b −−−−−−−ルー 7”4体132.12b −
−−−−・−給電点13a、13b−・−リアクタンス
素子導体15・−−−−−一−−−−−−−−−−−−
接地導体である。Figure 1 is a conductor pattern diagram showing an embodiment of the twin loop antenna of the present invention, Figure 2 is a Smith chart and SWR graph showing the impedance characteristics of the antenna in Figure 1, and Figure 3 corresponds to Figure 2. Figure 4 is the directional characteristic diagram of the antenna of Figure 1, Figure 5 is the directional characteristic diagram of the conventional twin loop antenna,
Figure 6 shows the gain of the antenna in Figure 1 and the conventional antenna.
Graphs of frequency characteristics, Figures 7 to 10 are diagrams showing conductors on the window glass surface of a car showing an example of a mirror image antenna, Figure 11
The figure shows the conductor arrangement of a conventional automobile window glass antenna. In addition, in the symbols used in the drawings, 2.---------------------Rear window glass 3-------------------------Heater Line 4-
・---------・-1---Radio antenna 5
−−−−−1・−・−・−・−Body 7−−−−−−−
-1・---1---・Power supply cable 10a, 10
b ----------Lou 7" 4 bodies 132.12b -
----Feeding points 13a, 13b--Reactance element conductor 15-----------
It is a grounding conductor.
Claims (1)
に形成された給電点と、上記各ループ状導体に付加され
たリアクタンス素子導体とから成る双ループアンテナ。 2、上記リアクタンス素子導体がU字状の折返し導体か
ら成り、上記給電点から見たアンテナインピーダンスが
純抵抗に近いことを特徴とする請求項1の双ループアン
テナ。 3、上記ループ状導体が、2つの連接した半ループ導体
と、その凹部を閉じるような配置の接地導体とから成り
、上記リアクタンス素子導体が、上記半ループ状導体の
端部と、上記接地導体とを結合するL字状導体から成る
ことを特徴とする請求項1の双ループアンテナ。[Claims] 1. A twin-loop antenna comprising two connected loop-shaped conductors, a feeding point formed at the connecting portion of each loop, and a reactance element conductor added to each of the loop-shaped conductors. 2. The twin loop antenna according to claim 1, wherein the reactance element conductor is made of a U-shaped folded conductor, and the antenna impedance seen from the feeding point is close to pure resistance. 3. The loop-shaped conductor is composed of two connected half-loop conductors and a grounding conductor arranged to close the recess, and the reactance element conductor is connected to the end of the half-loop-shaped conductor and the grounding conductor. 2. The twin-loop antenna according to claim 1, comprising an L-shaped conductor that couples the antenna.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11791890A JPH0414304A (en) | 1990-05-08 | 1990-05-08 | Stacked loop antenna |
GB9109828A GB2246023A (en) | 1990-05-08 | 1991-05-07 | Double loop antenna with a reactance element in each loop |
US07/966,593 US5285210A (en) | 1990-05-08 | 1992-10-26 | Double loop antenna with reactance elements |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11791890A JPH0414304A (en) | 1990-05-08 | 1990-05-08 | Stacked loop antenna |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH0414304A true JPH0414304A (en) | 1992-01-20 |
Family
ID=14723405
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP11791890A Pending JPH0414304A (en) | 1990-05-08 | 1990-05-08 | Stacked loop antenna |
Country Status (2)
Country | Link |
---|---|
JP (1) | JPH0414304A (en) |
GB (1) | GB2246023A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3015919U (en) * | 1995-03-17 | 1995-09-19 | 奥地 英樹 | Compact magnetic loop antenna device for mobile phones |
US6028559A (en) * | 1997-04-25 | 2000-02-22 | Matsushita Electric Industrial Co., Ltd. | Loop antenna |
JP2006217559A (en) * | 2004-03-16 | 2006-08-17 | Yagi Antenna Co Ltd | Broadband twin loop antenna |
US7289075B2 (en) | 2003-12-10 | 2007-10-30 | Asahi Glass Company, Limited | Planar antenna |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB9222213D0 (en) * | 1992-10-22 | 1992-12-02 | Pilkington Glass Ltd | Translucent article having induction loop antenna |
EP0594375A3 (en) * | 1992-10-22 | 1995-03-15 | Pilkington Glass Ltd | Translucent article having induction loop antenna. |
GB9408720D0 (en) * | 1994-05-03 | 1994-06-22 | Quantum Communications Group I | Antenna device |
EP0786824A1 (en) * | 1996-01-27 | 1997-07-30 | Akitoshi Imamura | A microloop antenna |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE7010571U (en) * | 1970-03-21 | 1970-07-13 | Ver Glaswerke Gmbh | CAR LENS WITH BUILT-IN ANTENNA. |
US4479127A (en) * | 1982-08-30 | 1984-10-23 | Gte Products Corporation | Bi-loop antenna system |
DK507584A (en) * | 1984-10-24 | 1986-04-25 | Electronic Identification Syst | PLANT FOR TRANSMISSION OF HIGH-FREQUENCY ELECTROMAGNETIC SIGNALS |
JPS6269704A (en) * | 1985-09-21 | 1987-03-31 | Nippon Sheet Glass Co Ltd | Window antenna for automobile |
EP0221694A3 (en) * | 1985-10-29 | 1988-06-01 | Toyota Jidosha Kabushiki Kaisha | Vehicle antenna system |
US4947180A (en) * | 1989-06-14 | 1990-08-07 | Terk Technologies Corporation | FM antenna |
-
1990
- 1990-05-08 JP JP11791890A patent/JPH0414304A/en active Pending
-
1991
- 1991-05-07 GB GB9109828A patent/GB2246023A/en not_active Withdrawn
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3015919U (en) * | 1995-03-17 | 1995-09-19 | 奥地 英樹 | Compact magnetic loop antenna device for mobile phones |
US6028559A (en) * | 1997-04-25 | 2000-02-22 | Matsushita Electric Industrial Co., Ltd. | Loop antenna |
US7289075B2 (en) | 2003-12-10 | 2007-10-30 | Asahi Glass Company, Limited | Planar antenna |
JP2006217559A (en) * | 2004-03-16 | 2006-08-17 | Yagi Antenna Co Ltd | Broadband twin loop antenna |
JP4634194B2 (en) * | 2004-03-16 | 2011-02-16 | 八木アンテナ株式会社 | Broadband twin loop antenna |
Also Published As
Publication number | Publication date |
---|---|
GB9109828D0 (en) | 1991-06-26 |
GB2246023A (en) | 1992-01-15 |
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