JP2008278414A - Antenna apparatus - Google Patents

Antenna apparatus Download PDF

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JP2008278414A
JP2008278414A JP2007122433A JP2007122433A JP2008278414A JP 2008278414 A JP2008278414 A JP 2008278414A JP 2007122433 A JP2007122433 A JP 2007122433A JP 2007122433 A JP2007122433 A JP 2007122433A JP 2008278414 A JP2008278414 A JP 2008278414A
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loop antenna
matching circuit
antenna
ground conductor
loop
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JP4910868B2 (en
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Nobuyasu Takemura
暢康 竹村
Masataka Otsuka
昌孝 大塚
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Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To accomplish an antenna apparatus which is approximately non-directional and holds high receiving sensitivity, almost without increasing antenna capacity. <P>SOLUTION: A component 1 is a first loop antenna disposed around a ground conductor 12 forming a ground plate, a component 2 is a second loop antenna disposed at a position of a prescribed height from the ground conductor 12 while approximately coaxially facing the first loop antenna 1, and a component 3 is a dielectric substrate on which the ground conductor 12 is formed. The first loop antenna 1 and the second loop antenna 2 are grounded via a first matching circuit 4, a second matching circuit 5, a third matching circuit 6 and a fourth matching circuit 7 connected to their respective terminal portions. A component 8 is a switching means connected to the first matching circuit 4 connected to the first loop antenna 1 and the third matching circuit 6 connected to the second loop antenna 2, and a component 9 is a receiver connected to the switching means 8. Furthermore, components 20 and 21 are power feeding parts, respectively. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

この発明は、スマートキーレスシステムの車載機など、主に無線機に用いられるアンテナ装置に関するものである。   The present invention relates to an antenna device mainly used for a radio device such as an in-vehicle device of a smart keyless system.

図５は従来のアンテナ装置の概略構成図及び接続状態を説明する構成図である。図において、１２はグランド導体、１３はループアンテナ、１４は裏面にグランド導体１２が設けられた誘電体基板、１５は受信装置、１６は第１の整合回路、１７は第２の整合回路である。図５における従来のアンテナ装置の構成では、グラウンド導体１２から高さｈの位置にループアンテナ１３が設けられている。   FIG. 5 is a schematic configuration diagram and a configuration diagram illustrating a connection state of a conventional antenna device. In the figure, 12 is a ground conductor, 13 is a loop antenna, 14 is a dielectric substrate provided with a ground conductor 12 on the back surface, 15 is a receiving device, 16 is a first matching circuit, and 17 is a second matching circuit. . In the configuration of the conventional antenna device in FIG. 5, the loop antenna 13 is provided at a position h from the ground conductor 12.

次に動作について説明する。
グランド導体１２から高さｈの位置に配置されたループアンテナ１３は、使用周波数帯域で動作するようにループアンテナ１３の給電部側の端部に接続された第１の整合回路１６及びループアンテナ１３の他方の端部に接続された第２の整合回路１７により、アンテナのインピーダンスを調整する。インピーダンスの調整されたループアンテナ１３の給電部に受信装置１５が接続され、受信装置１５により信号が受信される（例えば、特許文献１参照）。
特開２００３−８３２６ Next, the operation will be described.
The loop antenna 13 disposed at a height h from the ground conductor 12 includes the first matching circuit 16 and the loop antenna 13 that are connected to the end of the loop antenna 13 on the power feeding unit side so as to operate in the use frequency band. The antenna impedance is adjusted by the second matching circuit 17 connected to the other end of the antenna. The receiving device 15 is connected to the power feeding unit of the loop antenna 13 whose impedance is adjusted, and a signal is received by the receiving device 15 (see, for example, Patent Document 1).
JP2003-8326

上記のような従来のループアンテナ１３の給電部におけるインピーダンス特性及び反射特性の一例を図６に示す。図において、１８はインピーダンス特性、１９はＶＳＷＲ＝２の円である。ループアンテナ１３の給電部におけるインピーダンス特性１８はＶＳＷＲ≦２の特性となる周波数範囲ｆ１〜ｆ２の周波数帯域幅が狭く、性能が十分ではない。
以上のように、このアンテナの放射特性は一つのループアンテナ１３の特性により決まるため、アンテナ放射利得の低い方向からの電波に対しては受信感度が劣化するという問題があった。
また、車両内部に搭載する場合には、十分なアンテナ長を確保することが難しい構造であり、アンテナ長が制限されるために、使用周波数帯域の広帯域化が困難であるという問題があった。 An example of the impedance characteristic and the reflection characteristic in the feeding part of the conventional loop antenna 13 as described above is shown in FIG. In the figure, 18 is an impedance characteristic, and 19 is a circle of VSWR = 2. The impedance characteristic 18 in the power feeding portion of the loop antenna 13 has a narrow frequency bandwidth in the frequency range f1 to f2 in which VSWR ≦ 2 is satisfied, and the performance is not sufficient.
As described above, since the radiation characteristic of this antenna is determined by the characteristic of one loop antenna 13, there is a problem that the reception sensitivity deteriorates with respect to the radio wave from the direction where the antenna radiation gain is low.
In addition, when mounted inside a vehicle, it is difficult to ensure a sufficient antenna length, and there is a problem that it is difficult to widen the use frequency band because the antenna length is limited.

この発明は上記のような問題点を解決することを課題とする。
具体的には、従来のアンテナ容積をほとんど増加させずにアンテナ容積の許容範囲内で小型に形成でき、受信感度の劣化が低減されてほぼ無指向性の所要の受信感度を保持するアンテナ装置を実現することを課題とする。
また、従来のアンテナ容積をほとんど増加させずにアンテナ容積の許容範囲内で小型に形成でき、受信感度の劣化が低減されてほぼ無指向性の所要の受信感度が保持されると共に、使用周波数帯域が広帯域化されたアンテナ装置を実現することを課題とする。 This invention makes it a subject to solve the above problems.
Specifically, a conventional antenna device that can be formed in a small size within the allowable range of the antenna volume without substantially increasing the antenna volume, reduces the deterioration of the reception sensitivity, and maintains a required reception sensitivity that is almost omnidirectional. The challenge is to achieve this.
In addition, the conventional antenna volume can be reduced to a small size within the allowable range of the antenna volume, the reception sensitivity is reduced, and the required reception sensitivity is almost omnidirectional. An object of the present invention is to realize an antenna device having a wider bandwidth.

この発明に係わるアンテナ装置は、第１の整合回路と第３の整合回路のそれぞれの出力端に接続された切替手段と、前記切替手段に接続された受信装置とを備え、前記切替手段と前記受信装置により前記第１の整合回路と前記第３の整合回路からの出力信号を選択して受信するので、第１のループアンテナと第２のループアンテナの切り替えにより指向性ダイバーシチとして動作できる。
即ち、この発明に係わるアンテナ装置は、地板を構成するグランド導体と、両端部にそれぞれ接続された第１の整合回路と第２の整合回路を介して前記グランド導体に接続された使用する周波数帯の波長に比べて小さい第１のループアンテナと、前記第１のループアンテナにほぼ同軸で対向させて前記グランド導体から隔てて設けられ、前記第１の整合回路と同じ側の端部に接続された第３の整合回路と他方の端部に接続された第４の整合回路を介して前記グランド導体に接続された使用する周波数帯の波長に比べて小さな第２のループアンテナと、前記第１の整合回路と前記第３の整合回路のそれぞれの出力端に接続された切替手段と、前記切替手段に接続された受信装置と、を備え、前記切替手段と前記受信装置により前記第１の整合回路と前記第３の整合回路からの出力信号を選択して受信することを特徴とするものである。 The antenna device according to the present invention comprises switching means connected to the output terminals of the first matching circuit and the third matching circuit, and a receiving device connected to the switching means, the switching means and the Since the receiving device selects and receives the output signals from the first matching circuit and the third matching circuit, it can operate as directional diversity by switching between the first loop antenna and the second loop antenna.
That is, the antenna device according to the present invention includes a ground conductor constituting a ground plane, a first matching circuit connected to both ends, and a frequency band to be used connected to the ground conductor via a second matching circuit. A first loop antenna having a wavelength smaller than that of the first loop antenna, the first loop antenna being substantially coaxially opposed to the first loop antenna and separated from the ground conductor, and connected to an end on the same side as the first matching circuit. A second loop antenna smaller than the wavelength of the frequency band to be used connected to the ground conductor via a third matching circuit and a fourth matching circuit connected to the other end; Switching means connected to respective output terminals of the matching circuit and the third matching circuit, and a receiving device connected to the switching means, wherein the first matching is performed by the switching means and the receiving device. Times It is characterized in that the selecting and receiving the output signal from the third matching circuit.

この発明に係わるアンテナ装置では、切替手段と受信装置により第１のループアンテナと第２のループアンテナからの出力信号を選択して受信する指向性ダイバーシチを可能にしたため、従来のアンテナ容積をほとんど増加させずにアンテナ容積の許容範囲内で小型に形成でき、受信感度の劣化が低減されてほぼ無指向性の所要の受信感度を保持するアンテナ装置を実現できる。   In the antenna device according to the present invention, since the directional diversity for selecting and receiving the output signals from the first loop antenna and the second loop antenna by the switching means and the receiving device is enabled, the conventional antenna volume is almost increased. Therefore, it is possible to realize an antenna device that can be formed in a small size within the allowable range of the antenna volume without reducing the deterioration of the reception sensitivity and can maintain a required reception sensitivity that is almost omnidirectional.

実施の形態１．
図１は、この発明の実施の形態１に係わるアンテナ装置を示す構成説明図である。図において、１は地板を形成するグランド導体１２の周囲に配置された第１のループアンテナ、２はグランド導体１２から所定の高さの位置に第１のループアンテナ１にほぼ同軸で対向させて配置した第２のループアンテナ、３は裏面にグランド導体１２が形成された誘電体基板である。なお、図１では、グランド導体１２を誘電体基板３の一面に設けた場合を例示し、第１のループアンテナ１および第２のループアンテナ２の形状として２通りの形状を例示するが、他の構成は共通であるため、接続構成としては一方のループアンテナの形状に対応する構成を示している。４は第１のループアンテナ１の一端に接続された第１の整合回路、５は第１のループアンテナの他端に接続された第２の整合回路、６は第２のループアンテナ２の一端に接続された第３の整合回路、７は第２のループアンテナ２の他端に接続された第４の整合回路であり、第１のループアンテナ１及び第２のループアンテナ２はそれぞれの端部に接続された第１の整合回路４、第２の整合回路５、第３の整合回路６、第４の整合回路７を介して接地されている。８は第１のループアンテナ１に接続された第１の整合回路４と第２のループアンテナ２に接続された第３の整合回路６に接続された切替手段、９は切替手段８に接続された受信装置である。また、２０は第１のループアンテナ１の給電部、２１は第２のループアンテナ２の給電部である。
なお、第２のループアンテナ２の高さは、高くすると放射効率が上がり、低くすると放射効率が下がるので、ループアンテナの配置スペースなどを考慮して設定する。 Embodiment 1 FIG.
FIG. 1 is a configuration explanatory view showing an antenna apparatus according to Embodiment 1 of the present invention. In the figure, 1 is a first loop antenna disposed around a ground conductor 12 forming a ground plane, and 2 is substantially coaxially opposed to the first loop antenna 1 at a predetermined height from the ground conductor 12. The second loop antenna 3 is a dielectric substrate having a ground conductor 12 formed on the back surface. FIG. 1 illustrates the case where the ground conductor 12 is provided on one surface of the dielectric substrate 3, and illustrates two shapes as the shapes of the first loop antenna 1 and the second loop antenna 2. Since these configurations are common, the configuration corresponding to the shape of one loop antenna is shown as the connection configuration. 4 is a first matching circuit connected to one end of the first loop antenna 1, 5 is a second matching circuit connected to the other end of the first loop antenna, and 6 is one end of the second loop antenna 2. The third matching circuit 7 is connected to the second loop antenna 2, and the fourth matching circuit 7 is connected to the other end of the second loop antenna 2. The first loop antenna 1 and the second loop antenna 2 are connected to their respective ends. The first matching circuit 4, the second matching circuit 5, the third matching circuit 6, and the fourth matching circuit 7 connected to the unit are grounded. Reference numeral 8 is a switching means connected to the first matching circuit 4 connected to the first loop antenna 1 and a third matching circuit 6 connected to the second loop antenna 2, and 9 is connected to the switching means 8. Receiving device. Reference numeral 20 denotes a power feeding unit of the first loop antenna 1, and 21 denotes a power feeding unit of the second loop antenna 2.
The height of the second loop antenna 2 is set in consideration of the arrangement space of the loop antenna and the like because the radiation efficiency increases when the height is increased and the radiation efficiency decreases when the height is decreased.

図１に示すアンテナ装置では、第１の整合回路４から第４の整合回路７、切替手段８、受信装置９を同一の誘電体基板３のグランド導体１２と第１のループアンテナ１の間に設ける構成となっているが、誘電体基板３の外付けにしても同様の機能は得られる。
また、第１のループアンテナ１および第２のループアンテナ２は、それぞれ両端部に整合回路を接続することにより、使用する周波数帯の波長に比べて小さくなっている。 In the antenna device shown in FIG. 1, the first matching circuit 4 to the fourth matching circuit 7, the switching means 8, and the receiving device 9 are placed between the ground conductor 12 of the same dielectric substrate 3 and the first loop antenna 1. The same function can be obtained even if the dielectric substrate 3 is externally provided.
Further, the first loop antenna 1 and the second loop antenna 2 are made smaller than the wavelength of the frequency band to be used by connecting matching circuits to both ends.

次に動作について説明する。
グランド導体１２の周囲に配置された第１のループアンテナ１は、使用周波数帯域で動作するように第１のループアンテナ１の給電部２０に接続された第１の整合回路４及び第１のループアンテナ１の他方の端部に接続された第２の整合回路５により、第１のループアンテナ１の給電部２０におけるアンテナのインピーダンスを調整する。
また、第２のループアンテナ２は、使用周波数帯域で動作するように第２のループアンテナ２の給電部２１に接続された第３の整合回路６及び第２のループアンテナ２の他方の端部に接続された第４の整合回路７により、第２のループアンテナ２の給電部２１におけるアンテナのインピーダンスを調整する。
したがって、第１のループアンテナ１と第２のループアンテナ２それぞれの共振周波数を概ね同一にでき、また、第２のループアンテナ２は第１のループアンテナ１に対向させて配置されているため、第１のループアンテナ１と第２のループアンテナ２は電磁結合して２共振特性が得られる。 Next, the operation will be described.
The first loop antenna 1 disposed around the ground conductor 12 includes the first matching circuit 4 and the first loop connected to the power feeding unit 20 of the first loop antenna 1 so as to operate in the use frequency band. The second matching circuit 5 connected to the other end of the antenna 1 adjusts the impedance of the antenna in the power feeding unit 20 of the first loop antenna 1.
The second loop antenna 2 includes the third matching circuit 6 connected to the power feeding unit 21 of the second loop antenna 2 and the other end of the second loop antenna 2 so as to operate in the used frequency band. The impedance of the antenna in the power feeding unit 21 of the second loop antenna 2 is adjusted by the fourth matching circuit 7 connected to.
Therefore, the resonance frequencies of the first loop antenna 1 and the second loop antenna 2 can be made substantially the same, and the second loop antenna 2 is disposed to face the first loop antenna 1, The first loop antenna 1 and the second loop antenna 2 are electromagnetically coupled to obtain two resonance characteristics.

以上のように、使用周波数で動作するようにインピーダンスの調整された第１のループアンテナ１と第２のループアンテナ２を切替手段８により切り替え、第１のループアンテナ１と第２のループアンテナ２により順次受信を行い、受信装置９に出力する。受信装置９では受信した信号レベルの高いほうを選択するように切替手段８を制御して第１のループアンテナ１と第２のループアンテナ２を切り替え、指向性ダイバーシチとして動作する。
なお、上記ではグランド導体１２を誘電体基板３の一面に形成した場合を示したが、グランド導体板のみで形成しても良い。また、切替手段８と受信装置９を別個に構成した場合を例示したが、１つにまとめて構成しても良い。 As described above, the switching means 8 switches the first loop antenna 1 and the second loop antenna 2 whose impedances are adjusted so as to operate at the used frequency, and the first loop antenna 1 and the second loop antenna 2 are switched. Are sequentially received and output to the receiving device 9. The receiving device 9 operates as directional diversity by controlling the switching means 8 so as to select the higher received signal level to switch between the first loop antenna 1 and the second loop antenna 2.
Although the case where the ground conductor 12 is formed on one surface of the dielectric substrate 3 has been described above, it may be formed only by the ground conductor plate. Moreover, although the case where the switching means 8 and the receiver 9 were comprised separately was illustrated, you may comprise collectively.

ここで、実施の形態１に係わるアンテナ装置で効果を奏する理由について説明する。
図２は第１のループアンテナ１の給電部２０と第２のループアンテナ２の給電部２１におけるインピーダンス特性及び反射特性の一例を示した特性説明図である。図において、１０はインピーダンス特性、１１はＶＳＷＲ＝２の円である。第１のループアンテナ１の給電部２０と第２のループアンテナ２の給電部２１におけるインピーダンス特性は、ＶＳＷＲ≦２の特性となる周波数範囲ｆ１〜ｆ２の周波数帯域が広く、広帯域な特性を有していることがわかる。 Here, the reason why the antenna device according to Embodiment 1 is effective will be described.
FIG. 2 is a characteristic explanatory diagram showing an example of impedance characteristics and reflection characteristics in the power feeding unit 20 of the first loop antenna 1 and the power feeding unit 21 of the second loop antenna 2. In the figure, 10 is an impedance characteristic, and 11 is a circle of VSWR = 2. The impedance characteristics of the power feeding unit 20 of the first loop antenna 1 and the power feeding unit 21 of the second loop antenna 2 have a wide frequency band in the frequency range f1 to f2 in which the characteristics of VSWR ≦ 2 and have a wide band characteristic. You can see that

また、図３はそれぞれ第１のループアンテナ１と第２のループアンテナ２の水平面内および垂直面内の放射特性の一例を示したものである。第１のループアンテナ１と第２のループアンテナ２それぞれの水平面内と垂直面内の直交２方向の放射特性はそれぞれ概ね回転対称な放射パターンを有しており、第１のループアンテナ１と第２のループアンテナ２でそれぞれの放射パターンを互いに補償できる放射特性となっていることがわかる。   FIG. 3 shows an example of radiation characteristics in the horizontal plane and in the vertical plane of the first loop antenna 1 and the second loop antenna 2, respectively. The radiation characteristics in the two orthogonal directions in the horizontal plane and the vertical plane of each of the first loop antenna 1 and the second loop antenna 2 each have a substantially rotationally symmetric radiation pattern. It can be seen that the radiation characteristics of the two loop antennas 2 can compensate each radiation pattern.

以上のことから、実施の形態１のアンテナ装置では、第１の整合回路４及び第２の整合回路５によりインピーダンスが調整された第１のループアンテナ１と、第３の整合回路６及び第４の整合回路７によりインピーダンスが調整された第２のループアンテナ２それぞれの共振周波数を概ね同一にでき、且つ、第１のループアンテナ１と第２のループアンテナ２が電磁結合することにより２共振特性が得られ、使用する周波数帯域において広帯域化を図ることが可能である。
さらに、第１のループアンテナ１と第２のループアンテナ２を切替手段８により切り替えることで、アンテナの放射特性を変化させることができ、第１のループアンテナ１と第２のループアンテナ２の切り替えにより指向性ダイバーシチとして動作するため、ほぼ無指向性の高い受信感度を得ることができる。 From the above, in the antenna device of the first embodiment, the first loop antenna 1 whose impedance is adjusted by the first matching circuit 4 and the second matching circuit 5, the third matching circuit 6 and the fourth matching circuit 4. The resonance frequencies of the second loop antennas 2 whose impedances are adjusted by the matching circuit 7 can be made substantially the same, and the first loop antenna 1 and the second loop antenna 2 are electromagnetically coupled to each other so that two resonance characteristics are obtained. Thus, it is possible to increase the bandwidth in the frequency band to be used.
Further, by switching the first loop antenna 1 and the second loop antenna 2 by the switching means 8, the radiation characteristics of the antenna can be changed, and the switching between the first loop antenna 1 and the second loop antenna 2 is possible. Because of this, it operates as directional diversity, so that it is possible to obtain reception sensitivity with almost high omnidirectionality.

実施の形態２．
次に、この発明の実施の形態２に係わるアンテナ装置について、実施の形態１で図１に例示したアンテナ装置に基づいて説明する。実施の形態２に係わるアンテナ装置は、第１のループアンテナ１と第２のループアンテナ２を、それぞれのアンテナ軸の方向をずらせ、角度ずれにより互いのループが重ならないような配置として構成した点が実施の形態１と異なるものである。 Embodiment 2. FIG.
Next, an antenna apparatus according to Embodiment 2 of the present invention will be described based on the antenna apparatus illustrated in FIG. The antenna device according to the second embodiment is configured such that the first loop antenna 1 and the second loop antenna 2 are arranged so that the directions of the respective antenna axes are shifted so that the loops do not overlap each other due to an angle shift. Is different from the first embodiment.

以上のように、第１のループアンテナ１と第２のループアンテナ２の軸の方向をずらせて配置した場合でも、第１の整合回路４及び第２の整合回路５によりインピーダンスが調整された第１のループアンテナ１と、第３の整合回路６及び第４の整合回路７によりインピーダンスが調整された第２のループアンテナ２のそれぞれの共振周波数を概ね同一にでき、且つ、電磁結合させられるため、使用する周波数帯域において広帯域化を図ることが可能である。
また、第１のループアンテナ１と第２のループアンテナ２を切替手段８により切り替えることで、アンテナの放射特性を変化させることができ、第１のループアンテナ１と第２のループアンテナ２の切り替えにより指向性ダイバーシチとして動作するため、ほぼ無指向性の高い受信感度を得ることができる。
さらに、それぞれのアンテナ軸の方向をずらすことにより、第１のループアンテナ１と第２のループアンテナ２の放射特性の設定の自由度が増し、適切な指向性ダイバーシチとして動作するため、ほぼ無指向性の高い受信感度を得ることができる。 As described above, even when the axes of the first loop antenna 1 and the second loop antenna 2 are shifted from each other, the impedances adjusted by the first matching circuit 4 and the second matching circuit 5 are adjusted. The resonance frequencies of the first loop antenna 1 and the second loop antenna 2 whose impedances are adjusted by the third matching circuit 6 and the fourth matching circuit 7 can be made substantially the same and electromagnetically coupled. It is possible to increase the bandwidth in the frequency band to be used.
Further, the radiation characteristics of the antenna can be changed by switching the first loop antenna 1 and the second loop antenna 2 by the switching means 8, and the switching between the first loop antenna 1 and the second loop antenna 2 can be performed. Because of this, it operates as directional diversity, so that it is possible to obtain reception sensitivity with almost high omnidirectionality.
Furthermore, by shifting the directions of the respective antenna axes, the degree of freedom in setting the radiation characteristics of the first loop antenna 1 and the second loop antenna 2 is increased, and the antenna operates as appropriate directivity diversity. High reception sensitivity can be obtained.

実施の形態３．
図４は、この発明の実施の形態３に係わるアンテナ装置を示す構成説明図である。この実施の形態３に係わるアンテナ装置は、実施の形態１及び実施の形態２で説明した構成において、第１のループアンテナ１を誘電体基板３の表面に形成したグランド導体１２の周囲の誘電体基板３の表面に形成したものである。なお、その他の構成は実施の形態１と実施の形態２での構成説明と同様である。 Embodiment 3 FIG.
FIG. 4 is an explanatory diagram showing a configuration of an antenna apparatus according to Embodiment 3 of the present invention. In the antenna device according to the third embodiment, the dielectric around the ground conductor 12 in which the first loop antenna 1 is formed on the surface of the dielectric substrate 3 in the configuration described in the first and second embodiments. It is formed on the surface of the substrate 3. Other configurations are the same as those described in the first and second embodiments.

また、動作についても、それぞれ実施の形態１と実施の形態２での動作説明と同様であり、それぞれ実施の形態１と実施の形態２の効果と同様の効果を奏する。   The operation is the same as that described in the first embodiment and the second embodiment, and the same effects as those of the first and second embodiments are obtained.

さらに、第１のループアンテナ１を誘電体基板３の表面に形成しているため、誘電体基板３と一体で製作することができ、アンテナ導体の部品点数を増やすことなく、指向性ダイバーシチの動作を実現でき、ほぼ無指向性の高い受信感度を得ることができる。   Further, since the first loop antenna 1 is formed on the surface of the dielectric substrate 3, it can be manufactured integrally with the dielectric substrate 3, and the operation of directional diversity can be performed without increasing the number of antenna conductor components. Thus, it is possible to obtain a highly non-directional reception sensitivity.

以上のことから、この発明に係わるアンテナ装置によれば、従来のアンテナ容積をほとんど増加させずにアンテナ容積の許容範囲内で小型に形成でき、受信感度の劣化が低減されてほぼ無指向性の所要の受信感度を保持するアンテナ装置を実現できる。
また、従来のアンテナ容積をほとんど増加させずにアンテナ容積の許容範囲内で小型に形成でき、受信感度の劣化が低減されてほぼ無指向性の所要の受信感度が保持されると共に、使用周波数帯域が広帯域化されたアンテナ装置を実現できる。 From the above, according to the antenna device according to the present invention, the conventional antenna volume can be formed in a small size within the allowable range of the antenna volume without substantially increasing the antenna volume, and the deterioration of the reception sensitivity is reduced, so that it is almost non-directional. An antenna device that can maintain the required reception sensitivity can be realized.
In addition, the conventional antenna volume can be reduced to a small size within the allowable range of the antenna volume, the reception sensitivity is reduced, and the required reception sensitivity is almost omnidirectional. Can realize an antenna device having a wider bandwidth.

この発明の実施の形態１に係わるアンテナ装置を示す構成説明図である。BRIEF DESCRIPTION OF THE DRAWINGS It is structure explanatory drawing which shows the antenna apparatus concerning Embodiment 1 of this invention. 第１のループアンテナ１と第２のループアンテナ２の給電部におけるインピーダンス特性及び反射特性を示す特性説明図である。FIG. 6 is a characteristic explanatory diagram showing impedance characteristics and reflection characteristics in a feeding section of the first loop antenna 1 and the second loop antenna 2. 第１のループアンテナ１と第２のループアンテナ２の放射特性を示した特性説明図である。FIG. 3 is a characteristic explanatory diagram showing radiation characteristics of a first loop antenna 1 and a second loop antenna 2. この発明の実施の形態３に係わるアンテナ装置を示す構成説明図である。It is composition explanatory drawing which shows the antenna apparatus concerning Embodiment 3 of this invention. 従来のアンテナ装置の概略構成図及び接続状態を説明する構成図である。It is the schematic block diagram of the conventional antenna apparatus, and the block diagram explaining a connection state. ループアンテナ１３の給電部におけるインピーダンス特性及び反射特性を示したものである。The impedance characteristic and the reflection characteristic in the electric power feeding part of the loop antenna 13 are shown.

符号の説明Explanation of symbols

１ 第１のループアンテナ、２ 第２のループアンテナ、３ 誘電体基板、４ 第１の整合回路、５ 第２の整合回路、６ 第３の整合回路、７ 第４の整合回路、８ 切替手段、９ 受信装置、１０ インピーダンス特性、１１ ＶＳＷＲ＝２の円、１２ グランド導体、１３ ループアンテナ、１４ 誘電体基板、１５ 受信装置、１６ 第１の整合回路、１７ 第２の整合回路、１８ インピーダンス特性、１９ ＶＳＷＲ＝２の円、２０、２１ 給電部。 DESCRIPTION OF SYMBOLS 1 1st loop antenna 2 Second loop antenna 3 Dielectric substrate 4 1st matching circuit 5 2nd matching circuit 6 3rd matching circuit 7 4th matching circuit 8 Switching means , 9 Receiver, 10 Impedance characteristic, 11 VSWR = 2 circle, 12 Ground conductor, 13 Loop antenna, 14 Dielectric substrate, 15 Receiver, 16 First matching circuit, 17 Second matching circuit, 18 Impedance characteristic , 19 VSWR = 2 circle, 20, 21 Power feeding unit.

Claims (3)

地板を構成するグランド導体と、両端部にそれぞれ接続された第１の整合回路と第２の整合回路を介して前記グランド導体に接続された使用する周波数帯の波長に比べて小さい第１のループアンテナと、前記第１のループアンテナにほぼ同軸で対向させて前記グランド導体から隔てて設けられ、前記第１の整合回路と同じ側の端部に接続された第３の整合回路と他方の端部に接続された第４の整合回路を介して前記グランド導体に接続された使用する周波数帯の波長に比べて小さな第２のループアンテナと、前記第１の整合回路と前記第３の整合回路のそれぞれの出力端に接続された切替手段と、前記切替手段に接続された受信装置と、を備え、前記切替手段と前記受信装置により前記第１の整合回路と前記第３の整合回路からの出力信号を選択して受信することを特徴とするアンテナ装置。 A ground conductor constituting the ground plane, and a first loop smaller than the wavelength of the frequency band to be used connected to the ground conductor via a first matching circuit and a second matching circuit respectively connected to both ends. A third matching circuit connected to an end of the antenna on the same side as the first matching circuit and the other end, provided opposite to the first loop antenna substantially coaxially and spaced from the ground conductor A second loop antenna that is smaller than the wavelength of the frequency band to be used connected to the ground conductor via a fourth matching circuit connected to the first, the first matching circuit, and the third matching circuit Switching means connected to the respective output terminals, and a receiving device connected to the switching means, from the first matching circuit and the third matching circuit by the switching means and the receiving device. Output signal Antenna apparatus characterized by receiving in-option. 誘電体基板の一方の面に前記地板を構成するグランド導体を形成すると共に前記第１のループアンテナを前記グランド導体の周囲の前記誘電体基板の一方の面に形成し、前記第２のループアンテナを前記第１のループアンテナにほぼ同軸で対向させて前記グランド導体から隔てて設けたことを特徴とする請求項１記載のアンテナ装置。 A ground conductor constituting the ground plane is formed on one surface of a dielectric substrate, the first loop antenna is formed on one surface of the dielectric substrate around the ground conductor, and the second loop antenna is formed. The antenna device according to claim 1, wherein the antenna device is provided so as to face the first loop antenna substantially coaxially and separated from the ground conductor. 前記第１のループアンテナの軸方向と前記第２のループアンテナの軸方向とを互いに異なる方向として配置したことを特徴とする請求項１又は２記載のアンテナ装置。 The antenna device according to claim 1 or 2, wherein the axial direction of the first loop antenna and the axial direction of the second loop antenna are arranged as different directions.
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JPH1188246A (en) * 1997-09-08 1999-03-30 Matsushita Electric Ind Co Ltd Antenna system and radio receiver using it
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