JPH02209002A - Antenna system - Google Patents
Antenna systemInfo
- Publication number
- JPH02209002A JPH02209002A JP1030219A JP3021989A JPH02209002A JP H02209002 A JPH02209002 A JP H02209002A JP 1030219 A JP1030219 A JP 1030219A JP 3021989 A JP3021989 A JP 3021989A JP H02209002 A JPH02209002 A JP H02209002A
- Authority
- JP
- Japan
- Prior art keywords
- plate
- metal plate
- coaxial connector
- metal
- ground
- 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
- 239000002184 metal Substances 0.000 claims description 90
- 239000004020 conductor Substances 0.000 claims description 35
- 239000003989 dielectric material Substances 0.000 claims description 5
- 239000011888 foil Substances 0.000 claims description 2
- 230000005684 electric field Effects 0.000 abstract description 7
- 230000000694 effects Effects 0.000 description 4
- 238000007747 plating Methods 0.000 description 3
- 230000009977 dual effect Effects 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000002305 electric material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は、マイクロストリップアンテナに関するもの
で、更に詳しく言えば、２周波数帯を共用する放射素子
に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a microstrip antenna, and more specifically, to a radiating element that shares two frequency bands.
第５図（５１）、 （ｂ）は１例えば昭和５７年度電子
通信学会総合全国大会６４３に公報された従来の２周波
数帯を共用するアンテナ装置を示す平面図及び断面口で
あ）０図にお−て、（１）は地板、（２ｃ）は円環状の
金属板、（２ｄ）は円形状の金属板、 （４ａ）、（４
ｂ）は同軸コネクタ、（７）は地板（１）と円環状の金
属板（２ｃ）とを短絡する円環状の導体である。Figures 5 (51) and (b) are a plan view and a cross-sectional view of a conventional antenna device that shares two frequency bands, as published in 1988 IEICE General Conference 643). So, (1) is the main plate, (2c) is an annular metal plate, (2d) is a circular metal plate, (4a), (4
b) is a coaxial connector, and (7) is an annular conductor that short-circuits the ground plate (1) and an annular metal plate (2c).
次に動作につ−て説明する。第５図において。Next, the operation will be explained. In FIG.
同軸コネクタ（４ａ）から給電される周波数ｆ１ の電
波は地板（１）と円環状の金属板（２Ｃ）との間に電界
を励起し、電波は地板（１）面の法線方向に放射される
。The radio waves of frequency f1 supplied from the coaxial connector (4a) excite an electric field between the ground plane (1) and the annular metal plate (2C), and the radio waves are radiated in the normal direction of the plane of the ground plane (1). Ru.
また、同軸コネクタ（４ｂ）から給電される周波数ｆ２
の電波は０円形状の金属板（２ｄ）と円環状の金属板（
２ｃ）との間に電界を励起し、電波は円形状の金属板（
２ｄ）面の法線方向に放射される。ここに周波数ｆ２は
周波数ｆ１ よシ高いものである。Also, the frequency f2 supplied from the coaxial connector (4b)
The radio waves are generated by a circular metal plate (2d) and an annular metal plate (2d).
2c), and the radio waves are transmitted through a circular metal plate (
2d) radiated in the normal direction of the surface. Here, the frequency f2 is higher than the frequency f1.
このように、従来のアンテナ装置にお−ては。In this way, in the conventional antenna device.
地板（１）上に円環状の金属板（２Ｃ）と円形状の金属
板（２ｄや２つの導体を配置し、２つの同軸コネクタＣ
４ｍ＞＊ Ｃ４ｂ）を備えることによ９．２周波数帯を
共用可能とし、地板（１）の法線方向に電波を放射する
ものである。Arrange a circular metal plate (2C) and a circular metal plate (2d) on the main plate (1) and connect two coaxial connectors C.
4m>*C4b), it is possible to share the 9.2 frequency band and radiate radio waves in the normal direction of the ground plane (1).
上記のように、従来のアンテナ装置は以上のように構成
されているので、同軸コネクタ（４ａ）。As mentioned above, since the conventional antenna device is configured as above, the coaxial connector (4a).
（４ｂ）から給電される電波は主に地板口）面の法線方
向に放射されるため、地板（１）と平行な面内の方向へ
放射される電界強度は低く地板（１）面と同一面内方向
では通信を行えない等の問題点があった。Since the radio waves fed from (4b) are mainly radiated in the normal direction of the ground plate (1) surface, the electric field strength radiated in the direction parallel to the ground plate (1) is low. There were problems such as the inability to communicate in the same direction.
この発明は上記のような問題点を解消するためになされ
たもので、地板の面と平行な面内に電波を放射できると
ともに、２周波数帯以上の多周波帯を共用できるアンテ
ナ装置を得ることを目的とする。This invention was made to solve the above-mentioned problems, and provides an antenna device that can radiate radio waves in a plane parallel to the plane of the ground plane and can share multiple frequency bands of two or more frequencies. With the goal.
この発明に係るアンテナ装置は、地板上方に所定の距離
を保って２個の任意形状の金属板を配置し、地板上方に
配置した金属板の対向する両端を導体によシ地板と短絡
し、ｉた上記金属板上方に配置される金属板の対向する
両端を導体によシ上記金属板に短絡し、一方の同軸コネ
クタの内導体。In the antenna device according to the present invention, two metal plates of arbitrary shapes are arranged above the ground plane at a predetermined distance, and opposite ends of the metal plates arranged above the ground plane are short-circuited to the ground plane by a conductor. The opposite ends of the metal plate disposed above the metal plate are short-circuited to the metal plate by a conductor, and the inner conductor of one coaxial connector is connected to the metal plate.
外導体をそれぞれ、地板上方に配置した金属板。A metal plate with each outer conductor placed above the ground plane.
地板に導通させ、他方の同軸コネクタの内導体。Conductive to the ground plane and the inner conductor of the other coaxial connector.
外導体をそれぞれ、上記金属板上方に配置した金属板な
らびに上記金属板に導通させて構成したものである。The outer conductor is electrically connected to a metal plate disposed above the metal plate and the metal plate, respectively.
この発明におけるアンテナ装置においては、同軸コネク
タから給電された電波によシ、地板と地板上方に配置さ
れる金属板との間に電界が励起され、金属板の周囲と地
板との間からループアンテナと同じ指向性が得られるも
のである。In the antenna device according to the present invention, an electric field is excited between the ground plane and the metal plate placed above the ground plane by radio waves fed from the coaxial connector, and the loop antenna is generated between the periphery of the metal plate and the ground plane. The same directivity can be obtained.
以下、この発明の実施例を図について説明する。 Embodiments of the present invention will be described below with reference to the drawings.
第１図（ａ）、 （ｂ）において、 （１）は地板、（
２ａ） 、（２ｂ）は地板上方の所定の位置に配置する
金属板、（）は金属板（５ａ）、 （３ｂ）の対向する
両端を地板（１）、金属板（２ａ）に短絡する導体、（
４ａ）、 （４ｂ）は同軸コネクタである。In Figures 1(a) and (b), (1) is the main plate, (
2a) and (2b) are metal plates placed at predetermined positions above the ground plane, and () are conductors that short-circuit opposite ends of the metal plates (5a) and (3b) to the ground plane (1) and metal plate (2a). ,(
4a) and (4b) are coaxial connectors.
上記のように構成されたアンテナ装置の動作につりで説
明する。同軸コネクタ（４ａ）から給電される周波数ｆ
１ の電波は地板（１）と第１の金属板（２ａ）との間
に電界を励起し、地板（１）と第１の金属板（２ａ）と
の間から、第１の金属板（２ａ）の周囲を全長とするル
ープアンテナと同じ指向性パターンが放射される。また
、同軸コネクタ（４ｂ）から給電される周波数ｆ２の電
波は第１の金属板（２ｍ）を地板とし、第２の金属板（
２ｂ）との間に電界を励起し、第２の金属板（２ｂ）の
周囲を全長とするループアンテすと同じ指向性パターン
が放射される。周知のように、ループアンテナの指向性
パターンは、ループアンテナの直径りを例えばｚＤ／λ
＝ ｏ、 ｅ （ここに、λは波長）に選ぶことによシ
、ループアンテナが配置される面内に最大の放射を生じ
させ、配置される面と直交する方向にはほとんど放射を
なくすことができる。The operation of the antenna device configured as described above will be explained in detail. Frequency f supplied from coaxial connector (4a)
The radio waves of 1 excites an electric field between the ground plane (1) and the first metal plate (2a), and from between the ground plane (1) and the first metal plate (2a), the first metal plate ( The same directivity pattern as the loop antenna whose entire length is around 2a) is radiated. In addition, the radio waves of frequency f2 supplied from the coaxial connector (4b) use the first metal plate (2m) as the base plate and the second metal plate (2m) as the base plate.
When an electric field is excited between the second metal plate (2b) and a loop antenna whose entire length is around the second metal plate (2b), the same directional pattern is emitted. As is well known, the directivity pattern of a loop antenna is defined by the diameter of the loop antenna, for example, zD/λ.
By choosing = o, e (where λ is the wavelength), maximum radiation is generated in the plane where the loop antenna is placed, and almost no radiation is generated in the direction perpendicular to the plane where the loop antenna is placed. Can be done.
従って、この発明によるアンテナ装置においては、地板
（１）と同一面内に電波を放射することができ、かつ１
周波数ｆ１ 、 ｔ２の２周波数帯共用アンテナとして
も用いることができるものである。Therefore, the antenna device according to the present invention can radiate radio waves in the same plane as the ground plane (1), and
It can also be used as a dual frequency band antenna of frequencies f1 and t2.
次に第２図（ａ）、 （ｂ）に示すように、地板（１）
と第１の金属板（２ａ）並びに第１の金属板（２ａ）と
第２の金属板（２ｂ）との間に誘電体（５）を配置した
場合について説明する。Next, as shown in Figure 2 (a) and (b), the main plate (1)
A case will be described in which a dielectric material (5) is disposed between the first metal plate (2a) and the first metal plate (2a) and the second metal plate (2b).
−ｆｆＫマイクロストリップアンテナの共振周波数ｆｒ
は、地板上に配置される誘電体の誘電率をｇｒｅＲ電体
上に配置される導体板の直径をＤとすれば１次式で表わ
される。-ffK microstrip antenna resonant frequency fr
is expressed by a linear equation, where D is the dielectric constant of the dielectric material placed on the ground plane and D is the diameter of the conductor plate placed on the greR electric material.
従って１例えばεｒ＝２．３ の誘電体を用いればア
ンテナの径は約０．６６ 倍に小型化することができる
という効果がある。Therefore, if a dielectric material having εr=2.3, for example, is used, the diameter of the antenna can be reduced by about 0.66 times.
次に、第３図（ａ）、 （ｂ）に示すように、第１の地
板（１ａ）と第１の金属板（２ａ）と誘電体（５）、第
２の地板（１ｂ）と第２の金属板（２ｂ）と誘電体（５
）とを一体とした積層板によ多構成し、第１の金属板（
２ａ）、第２の金属板（２ｂ）の対向する両端をスルー
ホールメッキ（６）にて、第１の地板（１ａ）並びに第
２の地板（１ｂ）と短絡して構成した場合について説明
する。この場合、誘電体の両面に、金属箔を接着した積
層板を用いて所定の寸法に加工した。第１の地板（１ａ
）と第１の金属板（２ａ）と誘電体（５）とを一体とし
た第１の積層板と、第２の地板（１ｂ）と第２の金属板
（２ｂ）と誘電体（５）とを一体とした第２の積層板に
おいて、第１の金属板（２ａ）の対向する両端を複数個
のスルーホールメッキ（６）にて第１の地板（１ａ）と
短絡し、また、ｔ４２の金属板（２ｂ）の対向する両端
を複数個のスルーホールメッキ（６）にて第２の地板（
１ｂ）に短絡する。同軸コネクタ（４ａ）の外導体を第
１の地板（１ａ）と、同軸コネクタ（４ａ）の内導体と
第１の金属板（２ａ）と、ｔた同軸コネクタ（４ｂ）の
外導体を第２の地板（１ｂ）と、同軸コネクタ（４ｂ）
の内導体を第２の金属板（２ｂ）とに導通させて構成す
る。Next, as shown in FIGS. 3(a) and (b), the first base plate (1a), the first metal plate (2a) and the dielectric (5), the second base plate (1b) and the 2 metal plate (2b) and dielectric material (5
) are integrated into a laminated plate, and the first metal plate (
2a), a case will be explained in which the opposing ends of the second metal plate (2b) are short-circuited to the first base plate (1a) and the second base plate (1b) by through-hole plating (6). . In this case, a laminate with metal foil adhered to both sides of the dielectric was used to process the dielectric into predetermined dimensions. First base plate (1a
), a first laminate plate that integrates a first metal plate (2a), and a dielectric (5), a second base plate (1b), a second metal plate (2b), and a dielectric (5). In the second laminated board that is integrated with the first metal plate (2a), both opposing ends of the first metal plate (2a) are short-circuited to the first base plate (1a) by a plurality of through-hole platings (6), and t42 A second base plate (
1b). The outer conductor of the coaxial connector (4a) is connected to the first base plate (1a), the inner conductor of the coaxial connector (4a) is connected to the first metal plate (2a), and the outer conductor of the coaxial connector (4b) is connected to the second base plate (1a). main plate (1b) and coaxial connector (4b)
The inner conductor is electrically connected to the second metal plate (2b).
このようにアンテナを構成することにより１組立として
は、同軸コネクタ（４ａ） 、（４ｂ）を第１．第２の
地板（１ａ）、（Ｉｂ）と、第１．第２の金属板（２ａ
） 。By configuring the antenna in this way, as one assembly, the coaxial connectors (4a) and (4b) are connected to the first. The second base plate (1a), (Ib) and the first base plate (1a), (Ib). Second metal plate (2a
).
（２ｂ）に導通させることだけになシ０作業が非常に容
易に行えるという効果がある。(2b) has the effect that zero work can be performed very easily simply by making it conductive.
次に、第４図（ａ）、 （ｂ）に示すように、給電コネ
クタとして２重同軸で構成する場合について説明する。Next, as shown in FIGS. 4(a) and 4(b), a case will be described in which the power feeding connector is configured with a double coaxial structure.
給電コネクタは、同軸コネクタ（４ｂ）の外導体の外側
に同軸コネクタ（４ａ）の内導体を配置して構成する同
軸コネクタ（４ａ）の外導体を地板（１）と、同軸コネ
クタ（４ａ）の内導体を第１の金属板（２ａ）と、同軸
コネクタ（４ｂ）の外導体を第１の金属板（２ａ）と。The power supply connector is configured by placing the inner conductor of the coaxial connector (4a) outside the outer conductor of the coaxial connector (4b), and the outer conductor of the coaxial connector (4a) is connected to the base plate (1) and the inner conductor of the coaxial connector (4a) The inner conductor is the first metal plate (2a), and the outer conductor of the coaxial connector (4b) is the first metal plate (2a).
同軸コネクタ（４ｂ）の内導体を第２の金属板（２ｂ）
と導通させてアンテナを構成する。Connect the inner conductor of the coaxial connector (4b) to the second metal plate (2b)
The antenna is constructed by conducting with the antenna.
このように給電コネクタを２重同軸で構成することによ
シ、同軸コネクタ（４ａ） 、（４ｂ）と第１の金属板
（２ａ）、第２の金属板（２ｂ）との導通を取ることが
容易となり、まだ同軸コネクタ（ａａ） 、 （’ｂ）
が並列して配列されることによ）、スペースファクタが
良いという効果がある。By configuring the power supply connector with a double coaxial structure as described above, conduction can be established between the coaxial connectors (4a) and (4b) and the first metal plate (2a) and the second metal plate (2b). Easily connects coaxial connectors (aa), ('b)
(by arranging them in parallel), the effect is that the space factor is good.
以上のように、この発明によれば、地板の上方に第１の
金属板、第２の金属板を配置し、第１．第２の金属板の
対向する両端をそれぞれ、地板、第１の金属板と短絡し
、第１のコネクタの内、外導体をそれぞれ第１の金属板
、地板とに導通させ。As described above, according to the present invention, the first metal plate and the second metal plate are arranged above the base plate, and the first metal plate and the second metal plate are arranged above the base plate. The opposing ends of the second metal plate are short-circuited to the ground plate and the first metal plate, respectively, and the inner and outer conductors of the first connector are electrically connected to the first metal plate and the ground plate, respectively.
第２のコネクタの内、外導体をそれぞれ第２の金属板、
第１の金属板と導通させるように構成したので、地板の
面と平行な方向に電波を放射することができ、２周波数
帯共用アンテナとして用いることができるとともに、容
易に装置が得られると−う効果がある。The inner and outer conductors of the second connector are each covered with a second metal plate,
Since it is configured to be electrically connected to the first metal plate, it is possible to radiate radio waves in a direction parallel to the surface of the ground plate, and it can be used as a dual frequency band antenna, and the device can be easily obtained. It has a beneficial effect.
第１図（り、 （ｂ）、第２図（ａ）、 （ｂ）、第３
図（ａ）、 （ｂ） 。
第４図（ａ）、 （ｂ）はこの発明の一実施例を示す平
面図及び断面図、第５図（ａ）、 （ｂ）は従来のアン
テナ装置を示す平面図及び断面図である。図にお−で、
（１）。
（１ａ）、 （１ｂ）は地板、 （２ａ） 、 （２
ｂ）は金属板、 （２ｃ）は円環状の金属板、（Ｚｄ）
は円形状の金属板、 （３ａ）。
（３ｂ）は導体、 （４ｍ） 、（４ｂ）は同軸コネ
クタ、（５）は誘電体、（６）はスルーホールメッキ、
（７）は円筒状の導体である。
なお１図中、同一符号は同一、又は相当部分を示す。Figure 1 (ri, (b), Figure 2 (a), (b), Figure 3
Figures (a), (b). FIGS. 4(a) and 4(b) are a plan view and a sectional view showing an embodiment of the present invention, and FIGS. 5(a) and (b) are a plan view and a sectional view showing a conventional antenna device. In the diagram,
(1). (1a), (1b) are the main plate, (2a), (2
b) is a metal plate, (2c) is an annular metal plate, (Zd)
is a circular metal plate, (3a). (3b) is a conductor, (4m), (4b) is a coaxial connector, (5) is a dielectric, (6) is a through-hole plating,
(7) is a cylindrical conductor. In addition, in FIG. 1, the same reference numerals indicate the same or equivalent parts.
Claims (4)
第１、第２の金属板および第１、第２の同軸コネクタと
を備え、第１、第２の金属板の対向する両端をそれぞれ
地板、第１の金属板と短絡し、第１の同軸コネクタの内
、外導体をそれぞれ第１の金属板、地板とに導通させ、
第２の同軸コネクタの内、外導体をそれぞれ第２の金属
板、第１の金属板とに導通させることにより構成したこ
とを特徴とするアンテナ装置。(1) A base plate, first and second metal plates arranged above the base plate at a predetermined distance, and first and second coaxial connectors, and opposite ends of the first and second metal plates. are short-circuited to the ground plate and the first metal plate, respectively, and conduct the inner and outer conductors of the first coaxial connector to the first metal plate and the ground plate, respectively,
An antenna device characterized in that the inner and outer conductors of the second coaxial connector are electrically connected to a second metal plate and a first metal plate, respectively.
第１、第２の金属板、地板と第１の金属板、第１の金属
板と第２の金属板の間に装荷する誘電体及び第１、第２
の同軸コネクタとを備え、第１、第２の金属板の対向す
る両端をそれぞれ地板、第１の金属板と短絡し、第１の
同軸コネクタの内、外導体をそれぞれ第１の金属板、地
板とに導通させ、第２の同軸コネクタの内、外導体をそ
れぞれ第２の金属板、第１の金属板とに導通させること
により構成したことを特徴とするアンテナ装置。(2) First and second metal plates placed above the base plate at a predetermined distance; dielectric material loaded between the base plate and the first metal plate; and between the first metal plate and the second metal plate. and first and second
The opposite ends of the first and second metal plates are short-circuited to the ground plate and the first metal plate, respectively, and the inner and outer conductors of the first coaxial connector are connected to the first metal plate, respectively. What is claimed is: 1. An antenna device characterized in that the antenna device is constructed by electrically connecting the inner and outer conductors of the second coaxial connector to the ground plate and electrically connecting the inner and outer conductors of the second coaxial connector to the second metal plate and the first metal plate, respectively.
層板を所定の寸法に加工した第１の地板と第１の金属板
を構成する第１の積層板と、第２の地板と第２の金属板
を構成する第２の積層板および第１、第２の同軸コネク
タとを備え、第１、第２の金属板の対向する両端をスル
ーホールメッキにて第１の地板、第２の地板と短絡し、
第１の同軸コネクタの内、外導体をそれぞれ第１の積層
板の第１の金属板、第１の地板とに導通させ、第２の同
軸コネクタの内、外導体をそれぞれ第２の金属板、第２
の地板とに導通させることにより構成したことを特徴と
するアンテナ装置。(3) A first base plate made of a laminated plate with metal foil adhered to both sides of a dielectric of a predetermined thickness and processed to a predetermined size; a first laminated plate constituting the first metal plate; The first base plate includes a second laminated plate and first and second coaxial connectors that constitute a base plate and a second metal plate, and the opposing ends of the first and second metal plates are plated with through holes. , shorted to the second ground plane,
The inner and outer conductors of the first coaxial connector are electrically connected to the first metal plate and the first ground plate of the first laminate, respectively, and the inner and outer conductors of the second coaxial connector are connected to the second metal plate, respectively. , second
What is claimed is: 1. An antenna device characterized in that the antenna device is constructed by electrically conducting with the ground plane of the antenna device.
第１、第２の金属板および第１の同軸コネクタの内導体
の内側に第２の同軸コネクタの外導体を配置する２重同
軸コネクタとを備え、第１、第２の金属板の対向する両
端をそれぞれ地板、第１の金属板と短絡し、第１の同軸
コネクタの内、外導体をそれぞれ第１の金属板、地板と
に導通させ、第２の同軸コネクタの内、外導体をそれぞ
れ第２の金属板、第１の金属板とに導通させることによ
り構成したことを特徴とするアンテナ装置。(4) The first and second metal plates are placed above the ground plate at a predetermined distance, and the outer conductor of the second coaxial connector is placed inside the inner conductor of the first coaxial connector. a coaxial connector, the opposing ends of the first and second metal plates are short-circuited to the ground plate and the first metal plate, respectively, and the inner and outer conductors of the first coaxial connector are connected to the first metal plate and the ground plate, respectively. 1. An antenna device characterized in that the antenna device is constructed by electrically conducting the inner and outer conductors of the second coaxial connector with the second metal plate and the first metal plate, respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1030219A JPH02209002A (en) | 1989-02-09 | 1989-02-09 | Antenna system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1030219A JPH02209002A (en) | 1989-02-09 | 1989-02-09 | Antenna system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02209002A true JPH02209002A (en) | 1990-08-20 |
Family
ID=12297609
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1030219A Pending JPH02209002A (en) | 1989-02-09 | 1989-02-09 | Antenna system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02209002A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002001674A1 (en) * | 2000-06-27 | 2002-01-03 | Robert Bosch Gmbh | Slot antenna |
| JP2003249818A (en) * | 2002-02-25 | 2003-09-05 | Maspro Denkoh Corp | Microstrip antenna for two frequencies |
| JP2004208151A (en) * | 2002-12-26 | 2004-07-22 | Dx Antenna Co Ltd | Two-frequency shared antenna |
| JP2012503382A (en) * | 2008-09-22 | 2012-02-02 | カトライン−ベルケ・カーゲー | Multi-layer antenna device |
-
1989
- 1989-02-09 JP JP1030219A patent/JPH02209002A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002001674A1 (en) * | 2000-06-27 | 2002-01-03 | Robert Bosch Gmbh | Slot antenna |
| US6750826B2 (en) | 2000-06-27 | 2004-06-15 | Robert Bosch Gmbh | Slotted antenna |
| JP2003249818A (en) * | 2002-02-25 | 2003-09-05 | Maspro Denkoh Corp | Microstrip antenna for two frequencies |
| JP2004208151A (en) * | 2002-12-26 | 2004-07-22 | Dx Antenna Co Ltd | Two-frequency shared antenna |
| JP2012503382A (en) * | 2008-09-22 | 2012-02-02 | カトライン−ベルケ・カーゲー | Multi-layer antenna device |
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