JPH10276032A - Antenna system - Google Patents
Antenna systemInfo
- Publication number
- JPH10276032A JPH10276032A JP7798297A JP7798297A JPH10276032A JP H10276032 A JPH10276032 A JP H10276032A JP 7798297 A JP7798297 A JP 7798297A JP 7798297 A JP7798297 A JP 7798297A JP H10276032 A JPH10276032 A JP H10276032A
- Authority
- JP
- Japan
- Prior art keywords
- conductor film
- antenna device
- dielectric substrate
- radiation
- radiation conductor
- 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.)
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、携帯型通信機器等
に用いられるアンテナ装置に関する。The present invention relates to an antenna device used for portable communication equipment and the like.
【０００２】[0002]
【従来の技術】携帯型通信機器に用いられるアンテナ装
置としては、小型、高利得、低コストで、かつ実装の容
易なアンテナ装置が求められている。ところが、従来よ
り用いられているダイポールアンテナやモノポールアン
テナ等の線状アンテナは体積が大きいため、通信機器の
小型化の妨げになるとともに、通信機器本体への実装も
容易ではなく、小型化が要求されている携帯型通信機器
等に用いることは困難である。2. Description of the Related Art As an antenna device used for a portable communication device, a small, high-gain, low-cost and easy-to-mount antenna device is required. However, conventional linear antennas such as dipole antennas and monopole antennas have a large volume, which hinders miniaturization of communication devices, and is not easy to mount on communication device main bodies. It is difficult to use it for required portable communication devices and the like.
【０００３】このような問題を解決するためにいくつか
のアンテナ装置が提案されている。図９は、特開平７−
２８３６３９号公報に提案されたアンテナ装置を示す斜
視図である。アンテナ装置５０を構成する誘電体基体５
１には、内壁に放射導体膜が形成されたスルーホール５
２が形成されている。また、誘電体基体５１の表面に
は、表面電極５３が形成され、裏面には、コネクタ外部
導体板５４が取り付けられており、表面電極５３と、コ
ネクタ外部導体板５４とは、スルーホール５２の内壁に
形成された放射導体膜により、電気的に接続されてい
る。さらに、コネクタ外部導体板５４の、誘電体基体５
１が取り付けられている面と反対側の面に、同軸コネク
タ５５が取り付けられており、この同軸コネクタ５５の
外部導体および内部導体は、コネクタ外部導体板５４お
よびスルーホール５２内の放射導体膜にそれぞれ電気的
に接続されている。Some antenna devices have been proposed to solve such a problem. FIG.
1 is a perspective view showing an antenna device proposed in Japanese Patent No. 283639. Dielectric substrate 5 constituting antenna device 50
1 is a through hole 5 having a radiation conductor film formed on the inner wall.
2 are formed. A surface electrode 53 is formed on the surface of the dielectric substrate 51, and a connector external conductor plate 54 is attached to the back surface. The surface electrode 53 and the connector external conductor plate 54 It is electrically connected by the radiation conductor film formed on the inner wall. Further, the dielectric substrate 5 of the connector external conductor plate 54
A coaxial connector 55 is mounted on a surface opposite to the surface on which the first and second mounting members 1 are mounted. The outer conductor and the inner conductor of the coaxial connector 55 Each is electrically connected.
【０００４】このように構成されたアンテナ装置５０
は、同軸コネクタ５５が通信機器本体に設けられたコネ
クタに接続されることにより通信機器本体の外部に配設
され、通信機器本体から、同軸コネクタ５５を経由して
アンテナ装置５０に高周波電力が供給され、スルーホー
ル５２の内壁に形成された放射導体膜から電磁波が放射
される。[0004] The antenna device 50 configured as described above.
Is disposed outside the communication device main body by connecting the coaxial connector 55 to a connector provided on the communication device main body, and supplies high-frequency power from the communication device main body to the antenna device 50 via the coaxial connector 55. Then, an electromagnetic wave is radiated from the radiation conductor film formed on the inner wall of the through hole 52.
【０００５】このアンテナ装置５０は、放射導体膜が形
成されたスルーホール５２の延びる方向に対して垂直に
広がる面内において無指向性である。このようなアンテ
ナ装置が、例えば携帯電話に実装される場合、一般的に
携帯電話は垂直偏波の電磁波を送受信するため、アンテ
ナ装置は、スルーホールの延びる方向と、携帯電話本体
の長手方向とが一致するように携帯電話本体に実装され
る。[0005] The antenna device 50 is non-directional in a plane extending perpendicularly to the direction in which the through-hole 52 in which the radiation conductor film is formed extends. When such an antenna device is mounted on, for example, a mobile phone, the mobile phone generally transmits and receives vertically polarized electromagnetic waves, so that the antenna device has a through hole extending direction and a longitudinal direction of the mobile phone main body. Are mounted on the mobile phone main body so as to match.
【０００６】このようにアンテナ装置が実装された携帯
電話を実際に人間が用いると、アンテナ装置は、スルー
ホールの延びる方向に垂直な面内では無指向性であるた
め、アンテナ装置から送信される電磁波の一部は人体方
向に照射される。この人体方向に照射された電磁波は人
体で吸収され、通信に使用されないばかりか人体の健康
を害することになりかねないという問題がある。When a person actually uses a mobile phone on which the antenna device is mounted as described above, the antenna device is omnidirectional in a plane perpendicular to the direction in which the through hole extends, and is transmitted from the antenna device. Part of the electromagnetic wave is emitted toward the human body. There is a problem that the electromagnetic waves irradiated in the direction of the human body are absorbed by the human body and not only are not used for communication but also may impair the health of the human body.
【０００７】この問題を解決するため次のようなアンテ
ナ装置が考えられる。図１０は、そのアンテナ装置を示
す斜視図である。図１０に示すアンテナ装置６０は、直
方体形状の誘電体基体６１を有しており、その誘電体基
体６１の上面に、互いに近接した２つの端６２ａ，６２
ｂを有しその上面の四辺に沿うようにこれら２つの端６
２ａ，６２ｂをループ状に結ぶ放射導体膜６２が形成さ
れており、この放射導電膜の長さは送信対象の電磁波の
共振波長になるように調整されている。また誘電体基体
６１の下面には、面状に広がる接地導体膜６３が形成さ
れており、この接地導体膜６３は一辺の一部が切り欠か
れた形状を有している。また誘電体基体６１の側面に
は、共平面線路構造を有する給電導体膜６４，６５が形
成されている。この給電導体膜６４，６５は、それぞれ
放射導電膜６２の２つの端６２ａ，６２ｂに接続されて
互いに平行に上下方向に延びそれら給電導体膜６４，６
５のうちの一方の給電導体膜６５は、接地導電膜６３に
も接続され、もう一方の給電導体膜６４は誘電体基体６
１の下面まで達している。To solve this problem, the following antenna device can be considered. FIG. 10 is a perspective view showing the antenna device. The antenna device 60 shown in FIG. 10 has a rectangular parallelepiped dielectric substrate 61, and two ends 62 a and 62 adjacent to each other are provided on the upper surface of the dielectric substrate 61.
b and these two ends 6 along the four sides of its upper surface.
A radiating conductor film 62 connecting the 2a and 62b in a loop is formed, and the length of the radiating conductive film is adjusted to be the resonance wavelength of the electromagnetic wave to be transmitted. On the lower surface of the dielectric substrate 61, a grounding conductor film 63 which spreads in a plane is formed, and the grounding conductor film 63 has a shape in which one side is partially cut away. Feeding conductor films 64 and 65 having a coplanar line structure are formed on side surfaces of the dielectric substrate 61. The power supply conductor films 64 and 65 are connected to the two ends 62a and 62b of the radiation conductive film 62 and extend in the vertical direction in parallel with each other.
5, one of the power supply conductor films 65 is also connected to the ground conductive film 63, and the other power supply conductor film 64 is connected to the dielectric substrate 6.
1 has reached the lower surface.
【０００８】このように構成されたアンテナ装置６０
は、放射導体膜６２を備えているため１波長ループアン
テナの構造を有する。従って、放射導体膜６２からは誘
電体基体６１の上面に対し垂直に最大利得の電磁波が放
射される。また、この放射導体膜６２は誘電体基体６１
の上面に形成され、この誘電体基体６１の下面には接地
導体膜６３が形成されているため、放射導体膜６２から
放射された電磁波のうち、接地導体膜６３に向かう電磁
波は接地導体膜６３で反射される。従って、このアンテ
ナ装置６０を、例えば携帯電話に取り付ける場合に、人
間が携帯電話を使用する際にアンテナ装置の接地導体膜
が人間の方を向くように取り付けると、人間側には電磁
波は放射されず、電磁波は接地導体膜から放射導体膜に
向かう方向に最大利得で、効率よく通信に使用される。[0008] The antenna device 60 thus configured
Has the structure of a one-wavelength loop antenna since it has the radiation conductor film 62. Therefore, an electromagnetic wave having the maximum gain is radiated from the radiation conductor film 62 vertically to the upper surface of the dielectric substrate 61. The radiation conductor film 62 is formed on the dielectric substrate 61.
And the ground conductor film 63 is formed on the lower surface of the dielectric substrate 61. Of the electromagnetic waves radiated from the radiation conductor film 62, the electromagnetic wave directed to the ground conductor film 63 is Is reflected by Therefore, when the antenna device 60 is mounted on a mobile phone, for example, if a human uses the mobile phone and the ground conductor film of the antenna device is mounted so as to face a human, electromagnetic waves are radiated to the human side. Instead, the electromagnetic wave has a maximum gain in the direction from the ground conductor film to the radiation conductor film, and is used efficiently for communication.
【０００９】[0009]
【発明が解決しようとする課題】図１０に示すアンテナ
装置６０の放射導体膜６２には、給電導体膜を経由して
２つの端６２ａ，６２ｂから電力が供給される（以下、
この２つの端６２ａ，６２ｂを給電点と呼ぶ）。一般
に、１波長ループアンテナの場合、放射導体膜の電力の
給電点が互いに接近した点であると、そのアンテナは１
００Ω以上の高インピーダンスとなり、放射導体膜に電
力を効率よく供給することは難しい。従って、インピー
ダンスを小さくし放射導体膜に電力を効率よく供給する
には、アンテナ装置が、図１０に示すように共平面線路
構造の給電導体膜を有する場合、放射導体膜の給電点間
の距離を調整する、すなわち給電導体膜間のギャップ幅
を調整すればよい。このギャップ幅を調整することによ
りインピーダンスを小さくし、放射導体膜に電力を効率
よく供給することができる。また、放射導体膜のインピ
ーダンスおよび給電導体膜のインピーダンスは、互いに
整合させる必要があり、図１０に示すような共平面線路
構造を有する給電導体膜のインピーダンスＺは、給電導
体膜のギャップ幅を２Ｗ、給電導体膜の幅をＳとする
と、以下の式で表わすことができる。Power is supplied to the radiating conductor film 62 of the antenna device 60 shown in FIG. 10 from the two ends 62a and 62b via the feeding conductor film (hereinafter, referred to as the feeding conductor film).
These two ends 62a and 62b are called feeding points). In general, in the case of a one-wavelength loop antenna, if the power supply points of the radiation conductor film are close to each other, the antenna will
The impedance becomes higher than 00Ω and it is difficult to efficiently supply power to the radiation conductor film. Therefore, in order to reduce the impedance and efficiently supply power to the radiation conductor film, if the antenna device has a feed conductor film having a coplanar line structure as shown in FIG. , That is, the gap width between the power supply conductor films may be adjusted. By adjusting the gap width, the impedance can be reduced and power can be efficiently supplied to the radiation conductor film. Further, the impedance of the radiation conductor film and the impedance of the power supply conductor film need to be matched with each other, and the impedance Z of the power supply conductor film having the coplanar line structure as shown in FIG. If the width of the power supply conductor film is S, it can be expressed by the following equation.
【００１０】Ｚ∝｛√（１／εreff）｝ｋ … （１） ただし εreff：実効誘電率 ｋ＝Ｗ／（Ｗ＋Ｓ） … （２） ここで、実効誘電率εreffは、給電導体膜からは誘電体
基体内と空気中との双方に電界が発生することから、空
気の誘電率を１として、以下の式で表わされる。Z∝ ｛√ (1 / ε reff )｝ k (1) where ε reff : effective permittivity k = W / (W + S) (2) Here, the effective permittivity ε reff is Since an electric field is generated both in the dielectric substrate and in the air from, it is expressed by the following equation, where the dielectric constant of the air is 1.
【００１１】εreff＝（εr ＋１）／２ … （３） ただし εr ：誘電体基体の誘電率 ところで、放射導体膜に電力が効率よく供給されるよう
にインピーダンスを小さくするにあたって、給電導体膜
間のギャップ幅２Ｗを広げなければならない場合があ
る。このとき給電導体膜のインピーダンスＺを放射導体
膜のインピーダンスに整合させようとすると、（１）式
で表わされる給電導体膜のインピーダンスＺの式中のｋ
は（２）式で表わされるため、ギャップ幅２Ｗを広げる
と、それに伴ない給電導体膜の幅Ｓも広げる必要があ
る。給電導体膜のギャップ幅と２本の給電導体膜の幅と
の和は２Ｗ＋２Ｓであるから、誘電体基体の側面の幅が
２Ｗ＋２Ｓよりも小さい場合、給電導体膜のインピーダ
ンスを放射導体膜のインピーダンスに整合させることは
不可能となる。従って、誘電体基体の側面に給電導体膜
を形成する場合、給電導体膜の幅Ｓが制限をうけ、給電
導体膜のインピーダンスを所望の値にすることができな
くなり、放射導体膜のインピーダンスと給電導体膜のイ
ンピーダンスとを整合させることができない場合が生じ
るという問題がある。Ε reff = (ε r +1) / 2 (3) where ε r is the dielectric constant of the dielectric substrate. In order to reduce the impedance so that power is efficiently supplied to the radiation conductor film, the power supply conductor In some cases, it is necessary to increase the gap width 2W between the films. At this time, if an attempt is made to match the impedance Z of the power supply conductor film to the impedance of the radiation conductor film, k in the expression of the impedance Z of the power supply conductor film expressed by the equation (1) is obtained.
Is expressed by the equation (2). Therefore, when the gap width 2W is increased, the width S of the power supply conductor film also needs to be increased accordingly. Since the sum of the gap width of the power supply conductor film and the width of the two power supply conductor films is 2W + 2S, when the width of the side surface of the dielectric substrate is smaller than 2W + 2S, the impedance of the power supply conductor film is reduced to the impedance of the radiation conductor film. Matching becomes impossible. Therefore, when the power supply conductor film is formed on the side surface of the dielectric substrate, the width S of the power supply conductor film is limited, and the impedance of the power supply conductor film cannot be set to a desired value. There is a problem that it may not be possible to match the impedance of the conductor film.
【００１２】本発明は上記事情に鑑み、放出される電磁
波が通信に効率よく使用され、給電導体膜間のギャップ
幅が広くても、放射導体膜のインピーダンスと、給電導
体膜のインピーダンスとを整合させることができるアン
テナ装置を提供することを目的とする。In view of the above circumstances, the present invention matches the impedance of the radiation conductor film with the impedance of the power supply conductor film even when the emitted electromagnetic wave is used efficiently for communication and the gap width between the power supply conductor films is wide. It is an object of the present invention to provide an antenna device capable of causing the antenna device to operate.
【００１３】[0013]
【課題を解決するための手段】上記目的を達成する本発
明のアンテナ装置は、 （１）上面および下面を有するとともに縦に延びる辺で
区切られた側面を有する誘電体基体 （２）この誘電体基体の上面に形成されたループ状の放
射導体膜 （３）この誘電体基体の下面に形成された、この下面に
広がる接地導体膜 （４）この誘電体基体の側面のこの辺の両側に１本づつ
形成された、それぞれが上記放射導体膜に接続されて互
いに平行に上下方向に延び、１本が上記接地導体膜に接
続された２本の給電導体膜 を備えたことを特徴とする。According to the present invention, there is provided an antenna apparatus comprising: (1) a dielectric substrate having an upper surface and a lower surface and having side surfaces separated by vertically extending sides; and (2) the dielectric substrate. A loop-shaped radiating conductor film formed on the upper surface of the substrate. (3) A ground conductor film formed on the lower surface of the dielectric substrate and extending on the lower surface. (4) One film is provided on both sides of this side of the side surface of the dielectric substrate. And two power supply conductor films each connected to the radiation conductor film and extending in the vertical direction in parallel with each other, one of which is connected to the ground conductor film.
【００１４】図１、図２は、本発明のアンテナ装置の作
用の説明図である。図１は、図１０に示すアンテナ装置
の水平断面図であり、図２は、本発明のアンテナ装置の
水平断面図である。図２に示す本発明のアンテナ装置１
０は直方体状の誘電体基体１１を備えており、誘電体基
体１１の側面の、上下方向にのびる４本の辺のうち１本
の辺１１ａの両側に１本づつ給電導体膜１２，１３が形
成されている。従って、辺１１ａから給電導体膜１２ま
での距離と、辺１１ａから給電導体膜１３までの距離と
をあわせた距離を、図１に示す給電導体膜間の距離と等
しく設計したとき、図２に示すアンテナ装置の方が、図
１に示すアンテナ装置と比較して、２本の給電導体膜間
の距離が近くなり、上述した（３）式の示す実効誘電率
εreffが大きくなる。従って、従来のアンテナ装置と本
発明のアンテナ装置において、上述した（２）式中のＷ
の値が等しい場合、従来のアンテナ装置および本発明の
アンテナ装置の給電導体膜のインピーダンスＺをいずれ
もＺ＝Ｚ1 に調整しようとすると、本発明のアンテナ装
置の方が実効誘電率εreffが大きいことに伴って、
（１）式に示すｋの値も大きくする必要がある。このｋ
の値を大きくするということは、本発明のアンテナ装置
の給電導体膜の幅Ｓを、従来のアンテナ装置の給電導体
膜の幅Ｓよりも狭めることになる。従って、本発明のア
ンテナ装置は、従来のアンテナ装置よりも給電導体膜の
幅が狭くてもインピーダンスを整合させることができ
る。FIG. 1 and FIG. 2 are explanatory diagrams of the operation of the antenna device of the present invention. FIG. 1 is a horizontal sectional view of the antenna device shown in FIG. 10, and FIG. 2 is a horizontal sectional view of the antenna device of the present invention. Antenna device 1 of the present invention shown in FIG.
Reference numeral 0 denotes a rectangular parallelepiped dielectric substrate 11, and feeder conductor films 12, 13 are provided one by one on both sides of one side 11a of four sides extending vertically in the side surface of the dielectric substrate 11. Is formed. Therefore, when the total of the distance from the side 11a to the power supply conductor film 12 and the distance from the side 11a to the power supply conductor film 13 is designed to be equal to the distance between the power supply conductor films shown in FIG. 1, the distance between the two feed conductor films is shorter, and the effective dielectric constant re ref shown by the above-mentioned equation (3) is larger than that of the antenna apparatus shown in FIG. Therefore, in the conventional antenna device and the antenna device of the present invention, W in the above-described formula (2) is used.
If the values are equal, both the impedance Z of the feeding conductor films of the conventional antenna device and the antenna device of the present invention when trying to adjust the Z = Z 1, the effective permittivity epsilon reff towards the antenna device of the present invention With being big,
The value of k shown in equation (1) also needs to be increased. This k
When the value of is increased, the width S of the feed conductor film of the antenna device of the present invention is made smaller than the width S of the feed conductor film of the conventional antenna device. Therefore, the antenna device of the present invention can match the impedance even if the width of the feed conductor film is smaller than that of the conventional antenna device.
【００１５】ここで本発明のアンテナ装置の放射導体膜
が、この放射導電膜の、上記２本の給電導体膜との接続
点どうしの間が電気的に開放された開ループ状のもので
あってもよいし、また、放射導体膜が、帯状の導体膜が
一巡した閉ループ状のものであってもよい。Here, the radiating conductor film of the antenna device of the present invention is an open-loop radiating conductive film in which a connection point between the radiating conductive film and the two feeding conductor films is electrically opened. Alternatively, the radiation conductor film may be a closed loop shape in which a band-shaped conductor film makes a round.
【００１６】[0016]
【発明の実施の形態】以下、本発明の実施形態について
説明する。図３は本発明のアンテナ装置の第１実施形態
を示す斜視図、図４はその上面図、図５はその下面図、
図６は、図３に示すアンテナ装置の、２本の給電導体膜
のうちの一方の給電導体膜が形成された側面を示す図、
図７は、図３に示すアンテナ装置の、他方の給電導体膜
が形成された側面を示す図である。Embodiments of the present invention will be described below. 3 is a perspective view showing a first embodiment of the antenna device of the present invention, FIG. 4 is a top view thereof, FIG. 5 is a bottom view thereof,
FIG. 6 is a diagram illustrating a side surface of the antenna device illustrated in FIG. 3 on which one of the two feed conductor films is formed;
FIG. 7 is a diagram illustrating a side surface of the antenna device illustrated in FIG. 3 on which the other feeding conductor film is formed.
【００１７】図３に示すアンテナ装置２０は、上面およ
び下面が正方形である直方体形状の誘電体基体２１を備
えている。この誘電体基体２１の上面は、図４に示すよ
うに互いに近接した２つの端２２ａ，２２ｂを有し、こ
の上面の四辺に沿うようにこれら２つの端２２ａ，２２
ｂをループ状に結ぶ放射導体膜２２が形成されている。
この放射導体膜２２は、２つの端２２ａ，２２ｂどうし
の間が電気的に開放された開ループ状のものであり、ル
ープの長さは送信対象の電磁波の共振波長の長さに調整
されている。また、誘電体基体２１の下面には、図５に
示すようにこの下面に広がる接地導体膜２３が形成され
ており、この接地導体膜２３は、一辺の一部が切り欠か
れた形状を有している。また誘電体基体２１の側面に
は、図６、図７に示すように、２本の給電導体膜２４，
２５が形成されており、この２本の給電導体膜２４，２
５は、図３に示すように、側面を縦に区切る４つの辺の
うちの図３の手前側に示される辺２６の両側に１本づ
つ、互いに平行に上下方向に延びるように形成されてお
り、給電導体膜２４，２５は、それぞれ放射導体膜２２
の端２２ａ，２２ｂに接続されており、給電導体膜２５
は、接地導体膜２３に接続されており、給電導体膜２４
は、図５に示すように誘電体基体２１の下面にまで達し
ている。The antenna device 20 shown in FIG. 3 includes a rectangular parallelepiped dielectric substrate 21 having a square upper and lower surfaces. The upper surface of the dielectric substrate 21 has two ends 22a and 22b close to each other as shown in FIG. 4, and these two ends 22a and 22b are arranged along four sides of the upper surface.
A radiating conductor film 22 that connects b in a loop is formed.
The radiation conductor film 22 has an open loop shape in which the two ends 22a and 22b are electrically open between each other. The length of the loop is adjusted to the resonance wavelength of the electromagnetic wave to be transmitted. I have. On the lower surface of the dielectric substrate 21, a ground conductor film 23 extending on the lower surface is formed as shown in FIG. 5, and the ground conductor film 23 has a shape in which one side is partially cut away. doing. As shown in FIGS. 6 and 7, two power supply conductor films 24,
25, and the two power supply conductor films 24, 2
As shown in FIG. 3, 5 is formed so as to extend in the vertical direction in parallel with each other on both sides of a side 26 shown on the near side of FIG. The feed conductor films 24 and 25 are respectively provided on the radiation conductor film 22.
Of the power supply conductor film 25
Are connected to the ground conductor film 23 and
Has reached the lower surface of the dielectric substrate 21 as shown in FIG.
【００１８】このように構成されたアンテナ装置２０
は、放射導体膜２２を備えているため１波長ループアン
テナの構造を有する。従って、放射導体膜２２からは誘
電体基体２１の上面に対し垂直に最大利得の電磁波が放
射される。また、この放射導体膜２２は誘電体基体２１
の上面に形成され、この誘電体基体２１の下面には接地
導体膜が形成されているため、放射導体膜２２から放射
された電磁波のうち、接地導体膜２３に向かう電磁波は
接地導体膜２３で反射される。従って、アンテナ装置３
０からは、接地導体膜２３から放射導体膜２２に向かう
方向に最大利得の電磁波が放射され、電磁波は効率よく
通信に使用される。The antenna device 20 configured as described above
Has the structure of a one-wavelength loop antenna since it has the radiation conductor film 22. Therefore, the radiation conductor film 22 emits an electromagnetic wave having the maximum gain perpendicular to the upper surface of the dielectric substrate 21. The radiation conductor film 22 is formed on the dielectric substrate 21.
The ground conductor film is formed on the lower surface of the dielectric substrate 21. Of the electromagnetic waves radiated from the radiating conductor film 22, the electromagnetic wave traveling toward the ground conductor film 23 is formed by the ground conductor film 23. Is reflected. Therefore, the antenna device 3
From 0, an electromagnetic wave having the maximum gain is radiated from the ground conductor film 23 toward the radiation conductor film 22, and the electromagnetic wave is efficiently used for communication.
【００１９】また、アンテナ装置２０は、２本の給電導
体膜２４，２５が誘電体基体２１の側面の辺２６の両側
に１本づつ形成されているため、従来のアンテナ装置よ
りも給電導体膜の間の距離が近くなり、実効誘電率を大
きくすることができる。従って、アンテナ装置２０は、
従来のアンテナ装置と比較して、発明が解決しようとす
る課題の欄で示した（２）式中の給電導体膜の幅Ｓを狭
くすることができ、２本の給電導体膜２４，２５の間の
ギャップ幅が広い場合であっても、放射導体膜のインピ
ーダンスと、給電導体膜のインピーダンスとを整合させ
ることができる。Further, the antenna device 20 has two feeding conductor films 24 and 25 formed one on each side of the side 26 of the side surface of the dielectric substrate 21. Becomes shorter, and the effective dielectric constant can be increased. Therefore, the antenna device 20
Compared with the conventional antenna device, the width S of the feed conductor film in the formula (2) shown in the section of the problem to be solved by the invention can be reduced, and the two feed conductor films 24 and 25 Even when the gap width between them is wide, the impedance of the radiation conductor film and the impedance of the feed conductor film can be matched.
【００２０】以下に、図３から図７に示すアンテナ装置
２０の製造方法について説明する。先ず、誘電体基体２
１の材料を選定する。この誘電体基体２１の材料は、送
受信される電磁波の周波数帯域において比誘電率が１０
〜１００程度で安定している材料が好ましく、本実施形
態では、Ｓｒ（Ｎｉ1/3 Ｎｂ2/3 ）Ｏ3 系セラミックを
用いる。この材料は、送受信される電磁波の周波数が
３．８ＧＨｚのときの比誘電率が３１であり、Ｑ値が１
８００である。A method of manufacturing the antenna device 20 shown in FIGS. 3 to 7 will be described below. First, the dielectric substrate 2
Select the material No. 1. The material of the dielectric substrate 21 has a relative dielectric constant of 10 in the frequency band of the transmitted and received electromagnetic waves.
A material that is stable at about 100 is preferable. In the present embodiment, an Sr (Ni 1/3 Nb 2/3 ) O 3 ceramic is used. This material has a relative dielectric constant of 31 when the frequency of the transmitted and received electromagnetic waves is 3.8 GHz, and a Q value of 1
800.
【００２１】次に、放射導体膜２２、２本の給電導体膜
２４，２５、および誘電体基体２１の寸法を決定する。
この寸法は以下のようにして決定することができる。放
射導体膜２２のループの長さをλとすると、λは以下の
式で表わすことができる。 λ＝λ0 ／√（εreff） … （１） ただし、λ0 ；電磁波の真空中の波長 εreff；実効誘電率 ここで、（１）式における実効誘電率εreffは、放射導
体膜２２が誘電体基体２１の上面に形成され、また放射
導体膜２２から放射される電磁波が、誘電体基体１１の
上面に対し垂直に放射され、放射導体膜２２の内側およ
び外側に電界が発生することを考慮すると、以下の式で
表すことができる。Next, the dimensions of the radiation conductor film 22, the two feed conductor films 24 and 25, and the dielectric substrate 21 are determined.
This dimension can be determined as follows. Assuming that the length of the loop of the radiation conductor film 22 is λ, λ can be represented by the following equation. λ = λ 0 / √ (ε reff ) (1) where λ 0 ; wavelength of the electromagnetic wave in vacuum ε reff ; effective permittivity Here, the effective permittivity ε reff in the expression (1) is the radiation conductor film 22. Is formed on the upper surface of the dielectric substrate 21, and the electromagnetic wave radiated from the radiation conductor film 22 is radiated perpendicular to the upper surface of the dielectric substrate 11, and an electric field is generated inside and outside the radiation conductor film 22. Is considered, it can be expressed by the following equation.
【００２２】εreff＝（εr ＋３）／４ … （２） ただし、εr ；誘電体基体の誘電率 従って、（２）式で求めた実効誘電率εreffを、（１）
式に代入することによって放射導体膜２２の長さλを求
めることができる。本実施形態では、電磁波の共振周波
数を１．９ＧＨｚとするため、放射導体膜２２のループ
の長さλは、λ＝５４．１６ｍｍとなる。また、１波長
ループアンテナのインピーダンスは、一般的には１００
Ω以上の高インピーダンスであるが、放射導電膜の幅
や、放射導体膜の２つの端の間のギャップ幅を調整する
ことによりインピーダンスを低下させて給電効率を向上
させることができる。本実施形態では、インピーダンス
を５０Ωとするため、放射導体膜２２の幅を１．５ｍ
ｍ、ギャップ幅を０．７５ｍｍとする。Ε reff = (ε r +3) / 4 (2) where ε r ; dielectric constant of the dielectric substrate. Therefore, the effective dielectric constant ε reff obtained by the equation (2) is expressed by (1)
By substituting into the equation, the length λ of the radiation conductor film 22 can be obtained. In the present embodiment, since the resonance frequency of the electromagnetic wave is 1.9 GHz, the loop length λ of the radiation conductor film 22 is λ = 54.16 mm. The impedance of a one-wavelength loop antenna is generally 100
Although it has a high impedance of Ω or more, by adjusting the width of the radiation conductive film and the gap width between the two ends of the radiation conductor film, the impedance can be reduced and the power supply efficiency can be improved. In this embodiment, in order to set the impedance to 50Ω, the width of the radiation conductor film 22 is set to 1.5 m.
m, and the gap width is 0.75 mm.
【００２３】このように決定された放射導体膜の寸法か
ら、誘電体基体２１の長さおよび幅を、いずれも１４．
５４ｍｍとする。また誘電体基体２１の厚さについて
は、放射導体膜２２から接地導体２３までの距離を、
１．９ＧＨｚの共振周波数を有する電磁波の共振波長
の、誘電体基体での１／４波長に相当する７．０９ｍｍ
とする。From the dimensions of the radiation conductor film determined in this way, the length and width of the dielectric substrate 21 are both set to 14.
54 mm. Regarding the thickness of the dielectric substrate 21, the distance from the radiation conductor film 22 to the ground conductor 23 is determined by
7.09 mm corresponding to a quarter wavelength of the resonance wavelength of the electromagnetic wave having the resonance frequency of 1.9 GHz on the dielectric substrate.
And
【００２４】また、給電導体膜の幅や、給電導体膜の間
のギャップ幅を調整することにより所望の給電導体膜の
インピーダンスが得られる。本実施形態では、給電導体
膜の幅を２．０ｍｍ、ギャップ幅を０．７５ｍｍとす
る。次に、上述のような寸法を有する誘電体基体を作製
し、この誘電体基体に、接地導体膜２３のパターンと、
上述した寸法を有するように放射導体膜２２および２本
の給電導体膜２４，２５のパターンを、銅ペーストを用
いて厚膜印刷法により印刷し、還元雰囲気中で焼成す
る。Further, by adjusting the width of the power supply conductor film and the gap width between the power supply conductor films, a desired impedance of the power supply conductor film can be obtained. In the present embodiment, the width of the power supply conductor film is 2.0 mm, and the gap width is 0.75 mm. Next, a dielectric substrate having the dimensions as described above is manufactured, and a pattern of the ground conductor film 23 is formed on the dielectric substrate.
The patterns of the radiation conductor film 22 and the two power supply conductor films 24 and 25 are printed by a thick film printing method using a copper paste so as to have the dimensions described above, and fired in a reducing atmosphere.
【００２５】このようにしてアンテナ装置が製造され
る。図４は、本発明のアンテナ装置の第２実施形態を示
す図である。図３に示すアンテナ装置２０の構成要素と
同一の構成要素には同一番号を付して示し、相違点のみ
に付いて説明する。図４に示すアンテナ装置３０を構成
する誘電体基体２１の上面には、この上面の四辺に沿う
ように、帯状の導体膜が一巡した閉ループ状の放射導体
膜３１が形成されている。Thus, the antenna device is manufactured. FIG. 4 is a diagram showing a second embodiment of the antenna device of the present invention. The same components as those of the antenna device 20 shown in FIG. 3 are denoted by the same reference numerals, and only different points will be described. On the upper surface of the dielectric substrate 21 constituting the antenna device 30 shown in FIG. 4, a closed-loop radiating conductor film 31 in which a band-shaped conductor film makes a round is formed along the four sides of the upper surface.
【００２６】このように放射導体膜が、帯状の導体膜が
一巡した閉ループ状のものであってもよい。As described above, the radiation conductor film may have a closed loop shape in which the belt-shaped conductor film makes a round.
【００２７】[0027]
【発明の効果】以上説明したように、本発明のアンテナ
装置によれば、放出される電磁波が通信に効率よく使用
され、給電導体膜間のギャップ幅が広くても、放射導体
膜のインピーダンスと、給電導体膜のインピーダンスと
を整合させることができる。As described above, according to the antenna device of the present invention, the emitted electromagnetic wave is efficiently used for communication, and even if the gap width between the feed conductor films is wide, the impedance of the radiation conductor film is reduced. And the impedance of the power supply conductor film can be matched.
【図面の簡単な説明】[Brief description of the drawings]
【図１】従来のアンテナ装置の水平断面図である。FIG. 1 is a horizontal sectional view of a conventional antenna device.
【図２】本発明のアンテナ装置の水平断面図である。FIG. 2 is a horizontal sectional view of the antenna device of the present invention.
【図３】本発明のアンテナ装置の第１実施形態を示す斜
視図である。FIG. 3 is a perspective view showing a first embodiment of the antenna device of the present invention.
【図４】図３に示すアンテナ装置の上面図である。FIG. 4 is a top view of the antenna device shown in FIG. 3;
【図５】図３に示すアンテナ装置の下面図である。FIG. 5 is a bottom view of the antenna device shown in FIG. 3;
【図６】図３に示すアンテナ装置の、２本の給電導体膜
のうちの一方の給電導体膜が形成された側面を示す図で
ある。6 is a diagram illustrating a side surface of the antenna device illustrated in FIG. 3 on which one of the two feed conductor films is formed.
【図７】図３に示すアンテナ装置の、図６に示す給電導
体膜とは異なる給電導体膜が形成された側面を示す図で
ある。7 is a diagram illustrating a side surface of the antenna device illustrated in FIG. 3 on which a power supply conductor film different from the power supply conductor film illustrated in FIG. 6 is formed.
【図８】本発明のアンテナ装置の第２実施形態を示す図
である。FIG. 8 is a diagram showing a second embodiment of the antenna device of the present invention.
【図９】特開平７−２８３６３９号公報に提案されたア
ンテナ装置を示す斜視図である。FIG. 9 is a perspective view showing an antenna device proposed in Japanese Patent Application Laid-Open No. 7-283639.
【図１０】従来のアンテナ装置を示す斜視図である。FIG. 10 is a perspective view showing a conventional antenna device.
１０，２０，３０ アンテナ装置 １１，２１，３１ 誘電体基体 １１ａ，２６ 辺 １２，１３，２４，２５ 給電導体膜 ２２ 放射導体膜 ２２ａ，２２ｂ 端 ２３ 接地導体膜 10, 20, 30 Antenna device 11, 21, 31 Dielectric substrate 11a, 26 side 12, 13, 24, 25 Feeding conductor film 22 Radiating conductor film 22a, 22b End 23 Grounding conductor film
───────────────────────────────────────────────────── フロントページの続き (72)発明者 後藤 尚久 川崎市宮前区土橋６−15−１−Ａ514 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Naohisa Goto 6-15-1-A514 Dobashi, Miyamae-ku, Kawasaki-shi
Claims (3)
びる辺で区切られた側面を有する誘電体基体と、 該誘電体基体の上面に形成されたループ状の放射導体膜
と、 該誘電体基体の下面に形成された、該下面に広がる接地
導体膜と、 該誘電体基体の側面の該辺の両側に１本づつ形成され
た、それぞれが前記放射導体膜に接続されて互いに平行
に上下方向に延び、１本が前記接地導体膜に接続された
２本の給電導体膜とを備えたことを特徴とするアンテナ
装置。1. A dielectric substrate having an upper surface and a lower surface and having side surfaces separated by vertically extending sides, a loop-shaped radiation conductor film formed on an upper surface of the dielectric substrate, A ground conductor film formed on the lower surface and extending on the lower surface; and a ground conductor film formed one on each side of the side of the side surface of the dielectric substrate, each being connected to the radiation conductor film and extending in parallel with each other in a vertical direction. An antenna device, comprising: two feeder conductor films, one of which extends and is connected to the ground conductor film.
記２本の給電導体膜との接続点どうしの間が電気的に開
放された開ループ状のものであることを特徴とする請求
項１記載のアンテナ装置。2. The radiation conductor film according to claim 1, wherein a connection point between the radiation conductor film and the two power supply conductor films is electrically open between the connection points. The antenna device according to claim 1.
した閉ループ状のものであることを特徴とする請求項１
記載のアンテナ装置。3. The radiation conductor film according to claim 1, wherein the radiation conductor film is a closed loop having a band-shaped conductor film.
The antenna device as described in the above.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP07798297A JP3271697B2 (en) | 1997-03-28 | 1997-03-28 | Antenna device |
| DE69726523T DE69726523T2 (en) | 1996-09-12 | 1997-08-29 | antenna |
| EP97115011A EP0829917B1 (en) | 1996-09-12 | 1997-08-29 | Antenna device |
| KR1019970046783A KR100632616B1 (en) | 1996-09-12 | 1997-09-11 | Antenna device |
| US08/928,143 US5945959A (en) | 1996-09-12 | 1997-09-12 | Surface mounting antenna having a dielectric base and a radiating conductor film |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP07798297A JP3271697B2 (en) | 1997-03-28 | 1997-03-28 | Antenna device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10276032A true JPH10276032A (en) | 1998-10-13 |
| JP3271697B2 JP3271697B2 (en) | 2002-04-02 |
Family
ID=13649090
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP07798297A Expired - Fee Related JP3271697B2 (en) | 1996-09-12 | 1997-03-28 | Antenna device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3271697B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1330050C (en) * | 2003-06-25 | 2007-08-01 | 三星电机株式会社 | Internal antenna of mobile communication terminal |
| WO2008023800A1 (en) * | 2006-08-24 | 2008-02-28 | Hitachi Kokusai Electric Inc. | Antenna device |
-
1997
- 1997-03-28 JP JP07798297A patent/JP3271697B2/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1330050C (en) * | 2003-06-25 | 2007-08-01 | 三星电机株式会社 | Internal antenna of mobile communication terminal |
| WO2008023800A1 (en) * | 2006-08-24 | 2008-02-28 | Hitachi Kokusai Electric Inc. | Antenna device |
| US8193989B2 (en) | 2006-08-24 | 2012-06-05 | Hitachi Kokusai Electric Inc. | Antenna apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3271697B2 (en) | 2002-04-02 |
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