JP3402154B2 - Antenna device - Google Patents
Antenna deviceInfo
- Publication number
- JP3402154B2 JP3402154B2 JP27118697A JP27118697A JP3402154B2 JP 3402154 B2 JP3402154 B2 JP 3402154B2 JP 27118697 A JP27118697 A JP 27118697A JP 27118697 A JP27118697 A JP 27118697A JP 3402154 B2 JP3402154 B2 JP 3402154B2
- Authority
- JP
- Japan
- Prior art keywords
- conductor film
- antenna device
- dielectric substrate
- exciting
- radiation
- 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.)
- Expired - Lifetime
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- Details Of Aerials (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、通信機器等に用い
られるアンテナ装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antenna device used for communication equipment and the like.
【０００２】[0002]
【従来の技術】従来より、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が知られている。これら
線状アンテナは線状の放射導体を有しており、この放射
導体から電磁波が放出される。近年、携帯電話等の携帯
用通信機器の普及により、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が、携
帯用通信機器に使用するアンテナ装置に、上述したダイ
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
を用いると、これら線状アンテナを構成する放射導体は
線状であるためアンテナ自体の体積が大きく、携帯用通
信機器の小型化の妨げになるという問題がある。2. Description of the Related Art Conventionally, linear antennas such as dipole antennas and monopole antennas have been known. These linear antennas have a linear radiation conductor, and an electromagnetic wave is emitted from this radiation conductor. In recent years, with the spread of portable communication devices such as mobile phones, small size, high gain, low cost,
Moreover, an antenna device that is easy to mount is required, but if a linear antenna such as the dipole antenna or the monopole antenna described above is used for the antenna device used for the portable communication device, the radiation that constitutes these linear antennas is used. Since the conductor is linear, the volume of the antenna itself is large, which hinders downsizing of portable communication devices.
【０００３】また、線状アンテナを通信機器に取り付け
る際には、この線状アンテナは、一般にコネクタを介し
て通信機器本体の外部に取り付けられる。このように、
アンテナ装置が通信機器本体の外部に取り付けられると
アンテナ装置が破損し易いという問題があり、また、ア
ンテナ装置がコネクタを介して通信機器に取り付けられ
ると、アンテナ装置を通信機器に取り付ける前後でアン
テナ装置の入力インピーダンスが変化してしまうという
問題や、アンテナ装置の通信機器への取付けにコネクタ
を使用することにより製造コストがかかるという問題も
ある。When the linear antenna is attached to a communication device, the linear antenna is generally attached to the outside of the communication device main body via a connector. in this way,
When the antenna device is attached to the outside of the communication device body, there is a problem that the antenna device is easily damaged, and when the antenna device is attached to the communication device through the connector, the antenna device is attached before and after the attachment to the communication device. There is also a problem that the input impedance of the antenna changes, and a manufacturing cost is increased by using the connector for attaching the antenna device to the communication device.
【０００４】これらの問題を解決するため、以下に示す
ような、通信機器本体に内蔵される回路基板に実装でき
るアンテナ装置が提案されている。図４は、特開平７−
２２１５３７号公報に提案されたアンテナ装置を示す斜
視図である。図４に示すアンテナ５０は誘電体基板５１
を備えている。この誘電体基板５１の表面全体には放射
導体膜５２が形成されている。また誘電体基板５１の裏
面の一方の短辺側寄りに、その裏面のほぼ半分にわたっ
て接地導体膜５３が形成されている。さらに誘電体基板
５１の裏面の、他方の短辺側寄りから誘電体基板５１の
側面にかけて給電導体膜５４が形成されている。また誘
電体基板５１の内部に、内壁に導体を有するスルーホー
ル５５が形成されており、これにより放射導体膜５２と
給電導体膜５４が電気的に接続されている。In order to solve these problems, the following antenna devices have been proposed which can be mounted on a circuit board built in a communication device body. FIG.
It is a perspective view which shows the antenna device proposed by 221537. The antenna 50 shown in FIG. 4 is a dielectric substrate 51.
Is equipped with. A radiation conductor film 52 is formed on the entire surface of the dielectric substrate 51. Further, a ground conductor film 53 is formed on one side of the back surface of the dielectric substrate 51 near one short side thereof and over almost half of the back surface. Further, a power supply conductor film 54 is formed on the back surface of the dielectric substrate 51 from the side closer to the other short side to the side surface of the dielectric substrate 51. Further, a through hole 55 having a conductor on its inner wall is formed inside the dielectric substrate 51, whereby the radiation conductor film 52 and the feeding conductor film 54 are electrically connected.
【０００５】このように構成されたアンテナ装置５０が
通信機器本体に内蔵される回路基板に表面実装され、そ
の通信機器本体から、給電導体膜５４、スルーホール５
５を経由して放射導体膜５２に電力が供給され、放射導
体膜５２から電磁波が空中に放射される。図５は、特開
平９−２１４２４０号公報に提案されたアンテナ装置を
示す斜視図である。The antenna device 50 thus configured is surface-mounted on the circuit board built in the communication device main body, and from the communication device main body, the feeding conductor film 54 and the through hole 5 are formed.
Electric power is supplied to the radiation conductor film 52 via 5 and electromagnetic waves are radiated into the air from the radiation conductor film 52. FIG. 5 is a perspective view showing an antenna device proposed in Japanese Patent Laid-Open No. 9-214240.
【０００６】図５に示すアンテナ装置６０は誘電体基板
６１を備えている。この誘電体基板６１の表面には、そ
の表面のほぼ半分にわたって放射導体膜６２が形成され
ており、誘電体基板６１の裏面には面状に広がる接地導
体膜６３が形成されている。また、誘電体基板６１が有
する４つの側面のうちの１つの側面の両端部には、一対
の短絡導体膜６６が形成されており、この一対の短絡導
体膜６６をなす短絡導体膜６４，６５は、いずれも放射
導体膜６２と接地導体膜６３とを結んでいる。また、誘
電体基体６１の内部には励振用導体膜６４が延在してお
り、この励振用導体膜６４の一端は、誘電体基体６１側
面の、一対の短絡導体膜６６に挟まれた領域内に露出し
ている。また、この領域内には給電導体膜６７が形成さ
れており、この給電導体膜６７は励振用導体膜６４の、
誘電体基体６１側面に露出した部分に接続されている。
また、誘電体基板６１の裏面に形成された接地導体膜６
３は、１辺の一部が切り欠かれた形状を有しており、こ
の切り欠かれた部分には、導体膜６８が形成され、この
導体膜６８は、給電導体膜６７と接続している。The antenna device 60 shown in FIG. 5 includes a dielectric substrate 61. A radiation conductor film 62 is formed on the surface of the dielectric substrate 61 over almost half of the surface thereof, and a ground conductor film 63 that spreads in a plane is formed on the back surface of the dielectric substrate 61. Further, a pair of short-circuit conductor films 66 are formed at both ends of one of the four side surfaces of the dielectric substrate 61, and the short-circuit conductor films 64 and 65 forming the pair of short-circuit conductor films 66. Both connect the radiation conductor film 62 and the ground conductor film 63. In addition, an exciting conductor film 64 extends inside the dielectric substrate 61, and one end of the exciting conductor film 64 is a region on the side surface of the dielectric substrate 61 sandwiched by a pair of short-circuit conductor films 66. It is exposed inside. In addition, a power feeding conductor film 67 is formed in this region, and the power feeding conductor film 67 of the exciting conductor film 64 is
It is connected to the exposed portion on the side surface of the dielectric substrate 61.
In addition, the ground conductor film 6 formed on the back surface of the dielectric substrate 61.
3 has a shape in which a part of one side is notched, and a conductor film 68 is formed in the notched portion, and the conductor film 68 is connected to the power feeding conductor film 67. There is.
【０００７】このように構成されたアンテナ装置６０
が、例えば携帯用通信機器の回路基板に実装され、その
携帯用通信機器の本体からアンテナ装置６０の給電導体
膜６７に電力が供給される。すると、励振用導体膜６４
と放射導体膜６２との間の電磁結合により放射導体膜６
２から電磁波が空中に放射される。The antenna device 60 having the above-mentioned structure
However, for example, it is mounted on the circuit board of the portable communication device, and power is supplied from the main body of the portable communication device to the feeding conductor film 67 of the antenna device 60. Then, the exciting conductor film 64
And the radiation conductor film 62 are electromagnetically coupled to each other, the radiation conductor film 6
2 emits electromagnetic waves into the air.
【０００８】[0008]
【発明が解決しようとする課題】図４に示すアンテナ装
置５０では、給電導体膜５４から放射導体膜５２への給
電はスルーホール５５の内壁に形成された導体を経由し
て行われているため、スルーホールの加工精度や、給電
導体膜５４や放射導体膜５２とスルーホール５５内壁の
導体との接続部分が、アンテナ装置の入力インピーダン
スに影響を与え、所望の入力インピーダンスを得ること
が難しいという問題がある。In the antenna device 50 shown in FIG. 4, the feeding from the feeding conductor film 54 to the radiating conductor film 52 is performed via the conductor formed on the inner wall of the through hole 55. It is difficult to obtain a desired input impedance because the processing accuracy of the through hole and the connection portion between the feeding conductor film 54 and the radiation conductor film 52 and the conductor of the inner wall of the through hole 55 affect the input impedance of the antenna device. There's a problem.
【０００９】これに対し、図５に示すアンテナ装置６０
は給電導体膜６０から放射導体膜６２への給電が、励振
用導体膜６４と放射導体膜６２との間の電磁結合により
行われる。つまり、放射導体膜に給電をするために誘電
体基板に励振用導体膜と放射導体膜とを接続するための
スルーホールを形成することは不要であり、放射導体膜
６２への給電はこの放射導体膜６２と非接触である励振
用導体膜６４を経由して行われる。従って、このアンテ
ナ装置６０では、図４に示すアンテナ装置５０にみられ
るような入力インピーダンスを変動させる要因は少な
く、所望の入力インピーダンスが得られやすい。ところ
が、図５に示すアンテナ装置６０は、励振用導体膜６４
を誘電体基体板６１の内部に形成しなければならないた
め、アンテナ装置の製造工程数が増加し、コスト高とな
るという問題がある。On the other hand, the antenna device 60 shown in FIG.
The power feeding from the power feeding conductor film 60 to the radiation conductor film 62 is performed by electromagnetic coupling between the exciting conductor film 64 and the radiation conductor film 62. That is, it is not necessary to form a through hole for connecting the exciting conductor film and the radiation conductor film in the dielectric substrate in order to feed the radiation conductor film, and the radiation conductor film 62 is fed with this radiation. It is performed via the exciting conductor film 64 that is not in contact with the conductor film 62. Therefore, in this antenna device 60, there are few factors that change the input impedance as seen in the antenna device 50 shown in FIG. 4, and it is easy to obtain the desired input impedance. However, the antenna device 60 shown in FIG.
Must be formed inside the dielectric base plate 61, which increases the number of manufacturing steps of the antenna device and raises the cost.
【００１０】本発明は上記事情に鑑み、所望の入力イン
ピーダンスを容易に得ることができ、コストダウンが図
られた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, it is an object of the present invention to provide an antenna device capable of easily obtaining a desired input impedance and reducing costs.
【００１１】[0011]
【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）上下面および側面で囲まれてなる誘電体基体
（２）上記誘電体基体下面に広がる接地導体膜
（３）上記誘電体基体上面に形成された、互いの間の所
定の間隔を隔てた２つの端を有しこれら２つの端をこの
上面の縁に沿って周回して結ぶ放射導体膜
（４）互いの間に所定の間隔を隔てて上記誘電体基体側
面を上下方向に延び上記放射導体膜の２つの端それぞれ
と上記接地導体膜とを結ぶ一対の接地用導体膜
（５）上記誘電体基体側面の上記一対の接地用導体膜に
挟まれた領域内を上下方向に延びる部分を有し、上記誘
電体基体上面の、上記放射導体膜で囲まれた領域内への
延在および上記誘電体基体下面への延在が許容されてな
る励振用導体膜
を備えたことを特徴とする。An antenna device of the present invention which achieves the above object is (1) a dielectric substrate surrounded by upper and lower surfaces and side surfaces (2) a ground conductor film () spread on the lower surface of the dielectric substrate ( 3) A radiating conductor film (4) formed on the upper surface of the dielectric substrate, having two ends spaced apart from each other by a predetermined distance and connecting the two ends in a circular manner along the edge of the upper surface. A pair of grounding conductor films (5) that extend vertically on the side surface of the dielectric substrate with a predetermined space between them and connect the two ends of the radiation conductor film to the grounding conductor film (5). The side surface has a portion extending vertically in a region sandwiched by the pair of grounding conductor films, and the extension of the upper surface of the dielectric substrate into the region surrounded by the radiation conductor film and the dielectric It is equipped with an exciting conductor film that is allowed to extend to the bottom surface of the substrate. Characterize.
【００１２】ここで、上記励振用導体膜の、上記放射導
体膜側の先端がトリミングされてなることが効果的であ
る。本発明のアンテナ装置は、図５に示すアンテナ装置
と同様に、放射導体膜への給電にあたり、誘電体基体に
励振用導体膜と放射導体膜とを接続するためのスルーホ
ールの形成は不要であり、放射導体膜への給電はこの放
射導体膜と非接触である励振用導体膜を経由して行われ
る。このため、本発明のアンテナ装置は所望の入力イン
ピーダンスが得られやすい。しかも、本発明のアンテナ
装置が備えている励振用導体膜は、誘電体基体側面を上
下方向に延びる部分を有し、誘電体基体上下面への延在
が許容されてなるものである。つまり、励振用導体膜
は、誘電体基体の外面に備えられている。従って、製造
後のアンテナ装置の入力インピーダンスが所望の入力イ
ンピーダンスとは異なっていても、この励振用導体膜
の、上記放射導体膜側の先端をトリミングして、放射導
体膜と励振用導体膜の先端との間のギャップ長を変化さ
せることができ、ギャップ長を変化させることによりア
ンテナ装置の入力インピーダンスが変化し、所望の入力
インピーダンスを得ることができる。さらに、本発明の
アンテナ装置が備えている励振用導体膜は、上述したよ
うに、誘電体基体の外面に備えられているため、図４に
示すような、励振用導体膜が誘電体基体の内部に備えら
れているアンテナ装置と比較して、アンテナ装置の製造
工程数が削減され、コストダウンが図られる。Here, it is effective that the tip of the exciting conductor film on the side of the radiating conductor film is trimmed. Like the antenna device shown in FIG. 5, the antenna device of the present invention does not require formation of a through hole for connecting the exciting conductor film and the radiating conductor film to the dielectric substrate when feeding the radiating conductor film. The electric power is supplied to the radiation conductor film via the excitation conductor film which is not in contact with the radiation conductor film. Therefore, the antenna device of the present invention can easily obtain a desired input impedance. Moreover, the exciting conductor film provided in the antenna device of the present invention has a portion that extends vertically on the side surface of the dielectric substrate, and is allowed to extend to the upper and lower surfaces of the dielectric substrate. That is, the exciting conductor film is provided on the outer surface of the dielectric substrate. Therefore, even if the input impedance of the manufactured antenna device is different from the desired input impedance, the tip of the exciting conductor film on the side of the radiating conductor film is trimmed to form the radiating conductor film and the exciting conductor film. The gap length between the tip and the tip can be changed, and the input impedance of the antenna device can be changed by changing the gap length to obtain a desired input impedance. Further, since the exciting conductor film provided in the antenna device of the present invention is provided on the outer surface of the dielectric substrate as described above, the exciting conductor film as shown in FIG. As compared with the antenna device provided inside, the number of manufacturing steps of the antenna device is reduced, and the cost is reduced.
【００１３】[0013]
【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１は、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。図１に示すアンテナ装置１０は
直方体形状の誘電体基体１１を備えている。この誘電体
基体１１の上面には、互いの間に所定の間隔を隔てた２
つの端１２ａ，１２ｂを有しこれら２つの端１２ａ，１
２ｂをこの上面の縁に沿って周回して結ぶ放射導体膜１
２が形成されている。また、誘電体基体１１の下面には
面状に広がる接地導体膜１３が形成されており、この接
地導体膜１３は、１辺の中央が切り欠かれた形状を有し
ている。また、誘電体基体１１が有する４つの側面のう
ちの１つの側面には、一対の接地用導体膜１６が形成さ
れている。この一対の接地用導体膜１６は互いの間に所
定の間隔を隔てて上下方向に延び放射導体膜１２の２つ
の端１２ａ，１２ｂそれぞれと接地導体膜１３とを結ぶ
ものであり、一対の接地用導体膜１６のうちの一方の接
地用導体膜１４は、放射導体膜１２の端１２ａと接地導
体膜１３とを結び、他方の接地用導体膜１５は放射導体
膜１２の端１２ｂと接地導体膜１３とを結んでいる。こ
の誘電体基体１１には、誘電体基体１１の下面から側面
を経由し、上面まで延在する励振用導体膜１７が形成さ
れている。この励振用導体膜１７は、誘電体基体１１側
面の一対の接地用導体膜１６に挟まれた領域内を上下方
向に延びる部分を有し、誘電体基板１１上面の、放射導
体膜１２で囲まれた領域内に延在するとともに誘電体基
体１１下面にも延在している。また、接地用導体膜１
４，１５、励振用導体膜１７それぞれの、誘電体基体１
１側面の下部に形成された部分１４ａ，１５ａ，１７ａ
は、アンテナ装置１０の回路基板への表面実装時の電極
を兼ねている。BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below. FIG. 1 is a perspective view showing a first embodiment of the antenna device of the present invention. The antenna device 10 shown in FIG. 1 includes a rectangular parallelepiped dielectric substrate 11. On the upper surface of this dielectric substrate 11, a predetermined distance 2 is provided between each other.
Has two ends 12a, 12b and these two ends 12a, 1
Radiation conductor film 1 that circulates and ties 2b around the edge of the upper surface
2 is formed. Further, a ground conductor film 13 spreading in a planar shape is formed on the lower surface of the dielectric substrate 11, and the ground conductor film 13 has a shape in which the center of one side is cut out. A pair of grounding conductor films 16 is formed on one of the four side surfaces of the dielectric substrate 11. The pair of grounding conductor films 16 extend in the vertical direction at a predetermined interval between each other and connect the two ends 12a and 12b of the radiating conductor film 12 to the grounding conductor film 13, respectively. One of the conductor films 16 for grounding connects the end 12a of the radiation conductor film 12 and the ground conductor film 13, and the other conductor film 15 for grounding is connected to the end 12b of the radiation conductor film 12 and the ground conductor. It connects to the membrane 13. The dielectric substrate 11 is provided with an exciting conductor film 17 extending from the lower surface to the upper surface of the dielectric substrate 11 to the upper surface. The excitation conductor film 17 has a portion extending vertically in a region sandwiched by a pair of ground conductor films 16 on the side surface of the dielectric substrate 11, and is surrounded by the radiation conductor film 12 on the upper surface of the dielectric substrate 11. The dielectric substrate 11 also extends to the bottom surface of the dielectric substrate 11. In addition, the conductor film 1 for grounding
4, 15 and exciting conductor film 17 respectively, dielectric substrate 1
Portions 14a, 15a, 17a formed at the bottom of one side surface
Also serves as an electrode when the antenna device 10 is surface-mounted on the circuit board.
【００１４】このように構成されたアンテナ装置１０
は、放射導体膜１２への給電にあたり、誘電体基体１１
に励振用導体膜１７と放射導体膜１２とを接続するため
のスルーホールを形成することは不要であるため、所望
の入力インピーダンスが得られやすい。しかも、このア
ンテナ装置１０は、誘電体基体１１の外面に形成された
励振用導体膜１７を備えているため、製造後のアンテナ
装置の入力インピーダンスが所望の入力インピーダンス
とは異なっていても、この励振用導体膜１７の、放射導
体膜１２側の先端１７ａをトリミングして、放射導体膜
１２と励振用導体膜１７の先端１７ａとの間のギャップ
１８の長さを調整することができ、所望の入力インピー
ダンスを得ることができる。また、このアンテナ装置１
０は、上述したように、励振用導体膜１７が誘電体基体
１１の外面に形成されているため、励振用導体膜が誘電
体基体の内部に形成されたアンテナ装置と比較して、ア
ンテナ装置の製造工程数が削減され、コストダウンが図
られる。The antenna device 10 thus configured
Is for feeding the radiation conductor film 12 to the dielectric substrate 11
Since it is not necessary to form a through hole for connecting the exciting conductor film 17 and the radiation conductor film 12, it is easy to obtain a desired input impedance. Moreover, since the antenna device 10 includes the exciting conductor film 17 formed on the outer surface of the dielectric substrate 11, even if the input impedance of the manufactured antenna device is different from the desired input impedance, The length of the gap 18 between the radiation conductor film 12 and the tip 17a of the exciting conductor film 17 can be adjusted by trimming the tip 17a of the exciting conductor film 17 on the radiation conductor film 12 side. The input impedance of can be obtained. In addition, this antenna device 1
As described above, since the excitation conductor film 17 is formed on the outer surface of the dielectric base body 11, the antenna device 0 is an antenna device compared to the antenna device in which the excitation conductor film is formed inside the dielectric base body. The number of manufacturing steps is reduced and the cost is reduced.
【００１５】尚、図１に示すアンテナ装置１０の励振用
導体膜１７は、誘電体基体１１の下面から側面を経由し
上面にまで延在しているが、励振用導体膜は、誘電体基
体側面の一対の接地用導体膜に挟まれた領域内を上下方
向に延びる部分を有するものであれば、励振用導体膜と
放射導体膜との間で電磁結合が生じ、電波の送受信が行
われる。従って、アンテナ装置の使用条件により、誘電
体基体１１の上下面にまで励振用導体膜を延在させるこ
とが不要の場合は、誘電体基体側面の一対の接地用導体
膜に挟まれた領域内にのみ、あるいは側面と上面、ない
し側面と下面にのみ励振用導体膜を形成すればよい。The excitation conductor film 17 of the antenna device 10 shown in FIG. 1 extends from the lower surface of the dielectric substrate 11 to the upper surface through the side surfaces. The excitation conductor film is the dielectric substrate. As long as it has a portion that extends vertically in the area sandwiched between the pair of grounding conductor films on the side surface, electromagnetic coupling occurs between the exciting conductor film and the radiating conductor film to transmit and receive radio waves. . Therefore, if it is not necessary to extend the conductor film for excitation to the upper and lower surfaces of the dielectric substrate 11 depending on the usage conditions of the antenna device, the inside of the region sandwiched by the pair of ground conductor films on the side surface of the dielectric substrate. The exciting conductor film may be formed only on the side surface or on the side surface and the upper surface or on the side surface and the lower surface.
【００１６】図２は、本発明のアンテナ装置の第２実施
形態を示す斜視図である。尚、図２については、図１に
示す構成要素と同一の構成要素には同一番号を付して示
し、図１との相違点のみについて説明する。図２に示す
アンテナ装置２０は、図１に示すアンテナ装置１０を構
成する誘電体基体１１の側面に、アンテナ装置の回路基
板への表面実装用の電極２１が形成されている。FIG. 2 is a perspective view showing a second embodiment of the antenna device of the present invention. In FIG. 2, the same components as those shown in FIG. 1 are designated by the same reference numerals, and only the differences from FIG. 1 will be described. The antenna device 20 shown in FIG. 2 has electrodes 21 for surface mounting on the circuit board of the antenna device, which are formed on the side surfaces of the dielectric substrate 11 that constitutes the antenna device 10 shown in FIG.
【００１７】図１に示すアンテナ装置１０では、接地用
導体膜１４，１５，励振用導体膜１７それぞれの、誘電
体基体１１側面の下部に形成された部分１４ａ，１５
ａ，１７ａが、アンテナ装置１０の回路基板への表面実
装時の電極を兼ねているが、図２に示すように、回路基
板への表面実装用の電極２１を備え、この電極２１を用
いてアンテナ装置を回路基板表面に実装してもよい。In the antenna device 10 shown in FIG. 1, portions 14a and 15 of the grounding conductor films 14 and 15 and the exciting conductor film 17, respectively, which are formed below the side surface of the dielectric substrate 11.
Although a and 17a also serve as electrodes when the antenna device 10 is surface-mounted on the circuit board, as shown in FIG. 2, an electrode 21 for surface-mounting the circuit board is provided, and this electrode 21 is used. The antenna device may be mounted on the surface of the circuit board.
【００１８】[0018]
【実施例】以下、実施例について説明する。以下に、図
１に示すアンテナ装置を製造し、製造したアンテナ装置
の励振用導体膜をトリミングした時の結果について述べ
る。ここでは、アンテナ装置は以下のようにして製造し
た。EXAMPLES Examples will be described below. Hereinafter, the result of manufacturing the antenna device shown in FIG. 1 and trimming the exciting conductor film of the manufactured antenna device will be described. Here, the antenna device was manufactured as follows.
【００１９】先ず、誘電体基体１１の材料を選定した。
誘電体の材料としては、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
る材料が好ましい。ここではＳｒ（Ｎｉ1/3 Ｎｉ2/3 ）
Ｏ3 系セラミック誘電体を用いた。この材料は、送受信
される電磁波の周波数が３．８ＧＨｚの時の比誘電率ε
r がεr ＝２３であり、Ｑ値が１０００である。この材
料を用いて、長さ、幅、高さが、それぞれ１０ｍｍ、８
ｍｍ、４ｍｍの誘電体基体１１を製造した。First, the material of the dielectric substrate 11 was selected.
As the dielectric material, a material having a relative dielectric constant of about 10 to 100 and stable in the frequency band of transmitted and received electromagnetic waves is preferable. Here, Sr (Ni 1/3 Ni 2/3 )
An O 3 based ceramic dielectric was used. This material has a relative permittivity ε when the frequency of electromagnetic waves transmitted and received is 3.8 GHz.
r is ε r = 23 and the Q value is 1000. Using this material, the length, width and height are 10 mm and 8 respectively.
mm and 4 mm of the dielectric substrate 11 was manufactured.
【００２０】次に、誘電体基体１１に銅ペーストで放射
導体膜１２、接地導体膜１３、一対の接地用導体膜１
６、および励振用導体膜１７のパターンをスクリーン印
刷し、還元雰囲気中で焼成した。ここでは、放射導体膜
１２、一対の接地用導体膜１６、および励振用導体膜１
７の幅は、いずれも２ｍｍとし、励振用導体膜１７の先
端１７ａと、放射導体膜１２との間のギャップ長は１ｍ
ｍとした。Next, the radiation conductor film 12, the ground conductor film 13, and the pair of ground conductor films 1 are made of copper paste on the dielectric substrate 11.
6 and the pattern of the exciting conductor film 17 were screen-printed and fired in a reducing atmosphere. Here, the radiation conductor film 12, the pair of grounding conductor films 16, and the exciting conductor film 1
Each of the widths of 7 is 2 mm, and the gap length between the tip 17a of the exciting conductor film 17 and the radiation conductor film 12 is 1 m.
m.
【００２１】このようにして、アンテナ装置１０を製造
した。以下に、この製造したアンテナ装置１０の励振用
導体膜１７をトリミングした時の結果について説明す
る。図３は、上述のようにして製造したアンテナ装置に
ついて、励振用導体膜をトリミングする前および励振用
導体膜をトリミングした後におけるアンテナ装置のリタ
ーンロスの周波数特性を示す図である。In this way, the antenna device 10 was manufactured. The result of trimming the exciting conductor film 17 of the manufactured antenna device 10 will be described below. FIG. 3 is a diagram showing frequency characteristics of the return loss of the antenna device manufactured as described above before the trimming of the exciting conductor film and after trimming of the exciting conductor film.
【００２２】ここでリターンロスとは、アンテナ装置に
供給される電力に対する、反射電力の割合を対数で表わ
したものである。従って、リターンロスが小さいほど、
アンテナ装置に効率よく電力が供給されることを示す。
このアンテナ装置は、動作周波数での入力インピーダン
スは励振用導体膜と放射導体膜のギャップ長に依存し、
ギャップ長が長い程入力インピーダンスは小さくなる。
従って、入力インピーダンスの大きいアンテナ装置につ
いては励振用導体膜の先端をトリミングし、ギャップ長
を調整することによりリターンロスの改善が可能であ
る。Here, the return loss is the ratio of the reflected power to the power supplied to the antenna device expressed in logarithm. Therefore, the smaller the return loss,
It shows that power is efficiently supplied to the antenna device.
In this antenna device, the input impedance at the operating frequency depends on the gap length between the exciting conductor film and the radiating conductor film,
The longer the gap length, the smaller the input impedance.
Therefore, for an antenna device having a large input impedance, the return loss can be improved by trimming the tip of the exciting conductor film and adjusting the gap length.
【００２３】図３に示す実線は、励振用導体膜をトリミ
ングしなかったときの周波数特性、破線は励振用導体膜
の先端を０．５ｍｍトリミングした時の周波数特性、一
点鎖線は、励振用導体膜の先端を１ｍｍトリミングした
ときの周波数特性である。図３より、励振用導体膜の、
トリミングされる長さを長くすることにより、ピークＡ
が表れる周波数ａはほとんど変化しないが、この周波数
ａでのリターンロスが減少していることがわかる。The solid line shown in FIG. 3 is the frequency characteristic when the exciting conductor film is not trimmed, the broken line is the frequency characteristic when the tip of the exciting conductor film is trimmed by 0.5 mm, and the alternate long and short dash line is the exciting conductor. It is a frequency characteristic when the tip of the film is trimmed by 1 mm. From FIG. 3, the excitation conductor film,
By increasing the trimmed length, peak A
It can be seen that although the frequency a at which the symbol appears is almost unchanged, the return loss at this frequency a is reduced.
【００２４】[0024]
【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、所望の入力インピーダンスが容易に得ら
れ、かつコストダウンが図られる。As described above, according to the antenna device of the present invention, the desired input impedance can be easily obtained and the cost can be reduced.
【図１】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. 1 is a perspective view showing a first embodiment of an antenna device of the present invention.
【図２】本発明のアンテナ装置の第２実施形態を示す斜
視図である。FIG. 2 is a perspective view showing a second embodiment of the antenna device of the present invention.
【図３】回路基板に実装したアンテナ装置の励振用導体
膜を、トリミングする前およびトリミングした後におけ
るアンテナ装置のリターンロスの周波数特性を示す図で
ある。FIG. 3 is a diagram showing frequency characteristics of return loss of the antenna device before and after trimming the excitation conductor film of the antenna device mounted on the circuit board.
【図４】特開平７−２２１５３７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. 4 is a perspective view showing an antenna device proposed in JP-A-7-221537.
【図５】特開平９−２１４２４０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. 5 is a perspective view showing an antenna device proposed in Japanese Patent Laid-Open No. 9-214240.
１０ アンテナ装置 １１ 誘電体基体 １２ 放射導体膜 １３ 接地導体膜 １４，１５ 接地用導体膜 １６ 一対の接地用導体膜 １７ 励振用導体膜 １７ａ 先端 １８ ギャップ ２１ 電極 10 Antenna device 11 Dielectric substrate 12 Radiation conductor film 13 Ground conductor film 14,15 Grounding conductor film 16 Pair of grounding conductor films 17 Conductor film for excitation 17a tip 18 gap 21 electrodes
フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) H01Q 1/38 H01Q 13/08 Continuation of front page (58) Fields surveyed (Int.Cl. 7 , DB name) H01Q 1/38 H01Q 13/08
Claims (2)
基体と、 前記誘電体基体下面に広がる接地導体膜と、 前記誘電体基体上面に形成された、互いの間の所定の間
隔を隔てた２つの端を有しこれら２つの端を該上面の縁
に沿って周回して結ぶ放射導体膜と、 互いの間に所定の間隔を隔てて前記誘電体基体側面を上
下方向に延び前記放射導体膜の２つの端それぞれと前記
接地導体膜とを結ぶ一対の接地用導体膜と前記誘電体基
体側面の前記一対の接地用導体膜に挟まれた領域内を上
下方向に延びる部分を有し、前記誘電体基体上面の、前
記放射導体膜で囲まれた領域内への延在および前記誘電
体基体下面への延在が許容されてなる励振用導体膜とを
備えたことを特徴とするアンテナ装置。1. A dielectric base body surrounded by upper and lower surfaces and side surfaces, a ground conductor film spreading on the lower surface of the dielectric base body, and a predetermined space formed between them on the upper surface of the dielectric base body. A radiation conductor film which has two ends and which circulates and connects these two ends along the edge of the upper surface, and extends in the up-down direction on the side surface of the dielectric substrate with a predetermined space between them. It has a pair of grounding conductor films that connect each of the two ends of the conductor film and the grounding conductor film, and a portion that extends vertically in a region sandwiched by the pair of grounding conductor films on the side surface of the dielectric substrate. An excitation conductor film which is allowed to extend into the region surrounded by the radiation conductor film on the upper surface of the dielectric substrate and to extend to the lower surface of the dielectric substrate. Antenna device.
の先端がトリミングされてなることを特徴とする請求項
１記載のアンテナ装置。2. The antenna device according to claim 1, wherein a tip of the exciting conductor film on the side of the radiating conductor film is trimmed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27118697A JP3402154B2 (en) | 1997-10-03 | 1997-10-03 | Antenna device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP27118697A JP3402154B2 (en) | 1997-10-03 | 1997-10-03 | Antenna device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11112221A JPH11112221A (en) | 1999-04-23 |
| JP3402154B2 true JP3402154B2 (en) | 2003-04-28 |
Family
ID=17496556
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP27118697A Expired - Lifetime JP3402154B2 (en) | 1997-10-03 | 1997-10-03 | Antenna device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3402154B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4507445B2 (en) | 2001-04-25 | 2010-07-21 | パナソニック株式会社 | Surface mount antenna and electronic device using the same |
| WO2003044891A1 (en) | 2001-11-20 | 2003-05-30 | Ube Industries, Ltd. | Dielectric antenna module |
| JP2004215149A (en) * | 2003-01-08 | 2004-07-29 | Matsushita Electric Ind Co Ltd | Antenna |
-
1997
- 1997-10-03 JP JP27118697A patent/JP3402154B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH11112221A (en) | 1999-04-23 |
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