JP5351647B2 - Auxiliary antenna coupler - Google Patents

Auxiliary antenna coupler Download PDF

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JP5351647B2
JP5351647B2 JP2009177565A JP2009177565A JP5351647B2 JP 5351647 B2 JP5351647 B2 JP 5351647B2 JP 2009177565 A JP2009177565 A JP 2009177565A JP 2009177565 A JP2009177565 A JP 2009177565A JP 5351647 B2 JP5351647 B2 JP 5351647B2
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auxiliary antenna
antenna coupler
mobile terminal
feeding unit
power feeding
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JP2011035513A (en
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由樹 岡野
大輔 栗田
慎 中松
岡田　　隆
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NTT Docomo Inc
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本発明は、携帯電話などの無線通信機能を有する携帯端末及びこれに類似の装置に補助アンテナを結合させる補助アンテナ結合器に関する。   The present invention relates to a portable terminal having a wireless communication function such as a cellular phone and an auxiliary antenna coupler for coupling an auxiliary antenna to a similar device.

屋内などの弱電界地域において携帯電話をはじめとする携帯端末やこれに類似する装置を用いる際、携帯端末に搭載されたアンテナの特性に起因して通信が不可能になってしまう場合がある。こうした問題への対策として、高い性能を有する補助アンテナを携帯端末の外部に接続するという方法がこれまで広く用いられている。   When a portable terminal such as a cellular phone or a similar device is used in a weak electric field area such as indoors, communication may be impossible due to the characteristics of an antenna mounted on the portable terminal. As a countermeasure against such a problem, a method of connecting an auxiliary antenna having high performance to the outside of a portable terminal has been widely used so far.

携帯端末における補助アンテナの取付構造は、従来、特許文献１で明らかにされているように、無線特性に関する保守・動作確認を目的として携帯端末に具備された無線信号取り出し用外部端子を利用し、この外部端子に同軸線路等の接続ケーブルを介して補助アンテナを接続するという形態をとるのが一般的であった。しかし、このような取付構造は外部端子を備える携帯端末にのみ採用可能であり、また、外部端子を備えた携帯端末は、外部端子を設けるための切替回路を端末内に搭載する必要があり、この切替回路において信号の損失が生じるため当該携帯端末の無線特性が劣化してしまうという問題があった。   Conventionally, the auxiliary antenna mounting structure in the portable terminal uses an external terminal for taking out a wireless signal provided in the portable terminal for the purpose of maintenance and operation confirmation regarding the wireless characteristics, as clarified in Patent Document 1, In general, an auxiliary antenna is connected to the external terminal via a connection cable such as a coaxial line. However, such a mounting structure can be used only for a portable terminal equipped with an external terminal, and a portable terminal equipped with an external terminal needs to be equipped with a switching circuit for providing the external terminal in the terminal. There is a problem in that the wireless characteristics of the portable terminal deteriorate due to loss of signals in the switching circuit.

このような問題を解消すべく、特許文献２で明らかにされているような外部端子を用いない補助アンテナの取付構造が考案された。これは、携帯端末に搭載されたアンテナ素子の極近傍に携帯端末のアンテナ素子の形状に対応した形状の補助アンテナ結合器を配置して、携帯端末のアンテナ素子から放射された電力を一旦この補助アンテナ結合器で吸収し、接続ケーブルを介して補助アンテナに供給するという形態をとるものであり、非特許文献１に示すように既に商用化されている。非特許文献１の補助アンテナ結合器２００は図１１に示すように給電部２０１と結合部２０２とを備え、図１２に示すように、携帯端末１のアンテナ素子搭載位置２と結合部２０２とを対向させて用いる。   In order to solve such problems, an auxiliary antenna mounting structure that does not use an external terminal as clarified in Patent Document 2 has been devised. This is because an auxiliary antenna coupler having a shape corresponding to the shape of the antenna element of the mobile terminal is disposed in the immediate vicinity of the antenna element mounted on the mobile terminal, and the power radiated from the antenna element of the mobile terminal is temporarily subsidized. It is absorbed by an antenna coupler and supplied to an auxiliary antenna via a connection cable. As shown in Non-Patent Document 1, it has already been commercialized. The auxiliary antenna coupler 200 of Non-Patent Document 1 includes a power feeding unit 201 and a coupling unit 202 as shown in FIG. 11, and includes an antenna element mounting position 2 and a coupling unit 202 of the mobile terminal 1 as shown in FIG. Use them facing each other.

特開平１０−１３６４３０号公報JP-A-10-136430 特開２０００−９１８２８号公報JP 2000-91828 A

Nokia、"Nokia Antenna Coupler AXF-13L"、[online]、 [平成21年7月1日検索]、インターネット<URL : http://europe.nokia.com/axf-13l>Nokia, "Nokia Antenna Coupler AXF-13L", [online], [Search July 1, 2009], Internet <URL: http://europe.nokia.com/axf-13l>

特許文献２や非特許文献１に記載の補助アンテナ取付構造を用いる場合、携帯端末に搭載されたアンテナ素子の形状や配置に応じて補助アンテナ結合器を用意する必要があるという問題があった。   When the auxiliary antenna mounting structure described in Patent Document 2 or Non-Patent Document 1 is used, there is a problem that an auxiliary antenna coupler needs to be prepared according to the shape and arrangement of the antenna elements mounted on the mobile terminal.

また、従来の補助アンテナ結合器は単一の周波数帯でのみ実用的な結合特性が得られるものであるため、マルチバンド対応携帯端末に対しては補助アンテナの利用がいずれかの周波数のみに限られてしまうという問題があった。   In addition, since the conventional auxiliary antenna coupler can obtain practical coupling characteristics only in a single frequency band, the use of the auxiliary antenna is limited to only one of the frequencies for a multi-band compatible mobile terminal. There was a problem that would be.

本発明の目的は、各携帯端末に対して共通に用いることができ、かつ、複数の周波数帯で補助アンテナを利用可能とする補助アンテナ結合器を実現することにある。   An object of the present invention is to realize an auxiliary antenna coupler that can be used in common for each mobile terminal and can use an auxiliary antenna in a plurality of frequency bands.

本発明の補助アンテナ結合器は、略矩形の携帯端末に対向し、かつ当該携帯端末の対向面に対し平行に配置して使用し、給電部と、一端が上記給電部に接続され他端が開放された４本の分岐素子と、を備える。上記給電部が上記携帯端末の中央部と対向している状態において、上記４本の分岐素子のうち２本は、上記給電部から放射状に上記携帯端末の長手方向の一辺に概ね沿って互いに逆向きに延伸され、残りの２本は、上記給電部から放射状に上記携帯端末の長手方向の他辺に概ね沿って互いに逆向きに延伸されている。   The auxiliary antenna coupler of the present invention is used to face a substantially rectangular portable terminal and to be arranged in parallel to the facing surface of the portable terminal, and has a power feeding unit and one end connected to the power feeding unit and the other end And four branch elements opened. In the state where the power feeding unit is opposed to the central portion of the mobile terminal, two of the four branch elements are opposite to each other along the one side in the longitudinal direction of the mobile terminal radially from the power feeding unit. The remaining two are extended radially opposite from each other along the other side in the longitudinal direction of the mobile terminal.

本発明の補助アンテナ結合器によれば、補助アンテナ結合器を各携帯端末に対して共通化することができ、かつ、複数の周波数帯で補助アンテナが利用可能となる。   According to the auxiliary antenna coupler of the present invention, the auxiliary antenna coupler can be made common to each portable terminal, and the auxiliary antenna can be used in a plurality of frequency bands.

補助アンテナ結合器１００の構成例を示す図。The figure which shows the structural example of the auxiliary antenna coupler 100. FIG. 補助アンテナ結合器１００を用いた補助アンテナの接続イメージを示す図。The figure which shows the connection image of the auxiliary antenna using the auxiliary antenna coupler 100. FIG. 補助アンテナ結合器１００の別の構成例を示す図。The figure which shows another structural example of the auxiliary antenna coupler 100. FIG. 補助アンテナ結合器１００の電流分布を示す図。The figure which shows the electric current distribution of the auxiliary antenna coupler 100. 補助アンテナ結合器１００と携帯端末との相互結合特性例を示す図。The figure which shows the mutual coupling characteristic example of the auxiliary antenna coupler 100 and a portable terminal. 補助アンテナ結合器１００における分岐素子１０２の素子長に対する相互結合量の変化を示す図。The figure which shows the change of the mutual coupling amount with respect to the element length of the branch element 102 in the auxiliary antenna coupler 100. FIG. 補助アンテナ結合器の配置位置を変化させた場合の携帯端末との相互結合量の変化を示す図。The figure which shows the change of the mutual coupling | bonding amount with a portable terminal at the time of changing the arrangement position of an auxiliary antenna coupler. 補助アンテナ結合器の配置位置を変化させるイメージを示す図。The figure which shows the image which changes the arrangement position of an auxiliary antenna coupler. 携帯端末のアンテナ素子搭載位置を変化させた場合の補助アンテナ結合器との相互結合量の変化を示す図。The figure which shows the change of the mutual coupling | bonding amount with an auxiliary antenna coupler at the time of changing the antenna element mounting position of a portable terminal. 携帯端末のアンテナ素子搭載位置を変化させるイメージを示す図。The figure which shows the image which changes the antenna element mounting position of a portable terminal. 補助アンテナ結合器２００の構成例を示す図。The figure which shows the structural example of the auxiliary antenna coupler 200. FIG. 補助アンテナ結合器２００と携帯端末との位置関係のイメージを示す図。The figure which shows the image of the positional relationship of the auxiliary antenna coupler 200 and a portable terminal.

図１に補助アンテナ結合器１００の構成例を示す。補助アンテナ結合器１００は、給電部１０１と４本の分岐素子１０２ａ、１０２ｂ、１０２ｃ、１０２ｄを備える。また、図２に補助アンテナ結合器１００を用いた補助アンテナの接続イメージを示す。   FIG. 1 shows a configuration example of the auxiliary antenna coupler 100. The auxiliary antenna coupler 100 includes a power feeding unit 101 and four branch elements 102a, 102b, 102c, and 102d. FIG. 2 shows a connection image of an auxiliary antenna using the auxiliary antenna coupler 100.

補助アンテナ結合器１００は、携帯端末１の極近傍に携帯端末１と対向し、かつ、携帯端末１の対向面に平行に配置し、携帯端末１に搭載されたアンテナ素子から放射された電力を一旦補助アンテナ結合器１００で吸収した上で、この吸収した電力を接続ケーブル２０を介して補助アンテナ１０に供給するという形態で使用する。   The auxiliary antenna coupler 100 is disposed in the vicinity of the mobile terminal 1 so as to face the mobile terminal 1 and parallel to the facing surface of the mobile terminal 1, and to radiate power radiated from the antenna element mounted on the mobile terminal 1. Once absorbed by the auxiliary antenna coupler 100, the absorbed power is supplied to the auxiliary antenna 10 through the connection cable 20.

補助アンテナ結合器１００の４本の分岐素子１０２ａ、１０２ｂ、１０２ｃ、１０２ｄは、それぞれ一端が給電部１０１に接続され他端が解放された長さＬの素子である。ただし、必ずしも素子全体が４分岐していなくても、例えば図１に示す１０２ａと１０２ｃや、１０２ｂと１０２ｄのように給電部近傍の一部分であれば一体化されていても構わない。   The four branch elements 102a, 102b, 102c, and 102d of the auxiliary antenna coupler 100 are elements having a length L in which one end is connected to the power feeding unit 101 and the other end is released. However, even if the entire element does not necessarily have four branches, it may be integrated as long as it is a part in the vicinity of the power feeding unit, such as 102a and 102c and 102b and 102d shown in FIG.

各分岐素子は、給電部１０１が携帯端末１の中央部と対向している状態において、４本の分岐素子のうち１０２ａと１０２ｂの２本は、給電部１０１から放射状に携帯端末の長手方向の一辺に概ね沿って互いに逆向きに延伸される。また、１０２ｃと１０２ｄの２本は、上記給電部から放射状に上記携帯端末の長手方向の他辺に概ね沿って互いに逆向きに延伸される。この要件を満たしていれば図１の形状に限定されず、例えば図３(a)や(b)に示すような形状にしても構わない。また、図１及び図３に示す形状は携帯端末が折り畳み型の場合に最適化した形状であるが、必ずしもこのように携帯端末の形状にあわせて３次元で構成せず、例えば平面的に構成しても構わない。   In the state where the power feeding unit 101 is opposed to the central part of the mobile terminal 1, each of the branching elements is such that two of the four branching elements 102 a and 102 b radiate from the power feeding unit 101 in the longitudinal direction of the mobile terminal. They are stretched in opposite directions along substantially one side. Further, two of 102c and 102d are extended in opposite directions from each other along the other side in the longitudinal direction of the mobile terminal in a radial manner from the power supply unit. As long as this requirement is satisfied, the shape is not limited to the shape shown in FIG. 1, and for example, the shape shown in FIGS. 3A and 3B may be used. The shape shown in FIGS. 1 and 3 is an optimized shape when the mobile terminal is a foldable type. However, the shape is not necessarily configured in three dimensions according to the shape of the mobile terminal, for example, a planar configuration. It doesn't matter.

図４は、補助アンテナ結合器１００の動作原理を示す各分岐素子上の電流分布のイメージ図である。図４(a)は第１周波数帯における電流分布、図４(b)は第２周波数帯における電流分布を示したものであり、図４(a)及び(b)の両矢印は図４(c)に示すように、電流の振幅が中央部が最大、両端が最小であることを表している。なお、第１周波数帯とは、ある分岐素子長Ｌにおいて１／２波長となる周波数を中心周波数とする周波数帯で、図４(a)からわかるように給電部付近で振幅が最大、開放端において最小となり、補助アンテナ結合器１００全体で１／２波長モードで動作する。また第２周波数帯とは、ある分岐素子長Ｌにおいて３／２波長となる周波数を中心周波数とする周波数帯で、図４(b)からわかるように給電部付近及び分岐素子の中央付近で振幅が最大となり、補助アンテナ結合器１００全体で３／２波長モードで動作する。   FIG. 4 is an image diagram of a current distribution on each branch element showing the operation principle of the auxiliary antenna coupler 100. 4 (a) shows the current distribution in the first frequency band, FIG. 4 (b) shows the current distribution in the second frequency band, and the double arrows in FIGS. 4 (a) and 4 (b) are shown in FIG. As shown in c), the current amplitude is maximum at the center and minimum at both ends. The first frequency band is a frequency band whose center frequency is a frequency that is ½ wavelength in a certain branch element length L. As can be seen from FIG. The auxiliary antenna coupler 100 as a whole operates in the half wavelength mode. The second frequency band is a frequency band whose center frequency is a frequency of 3/2 wavelengths in a certain branch element length L. As can be seen from FIG. 4 (b), the amplitude is in the vicinity of the feeding section and the center of the branch element. And the auxiliary antenna coupler 100 as a whole operates in the 3/2 wavelength mode.

図５に、図１に示す補助アンテナ結合器１００の給電部１０１におけるアンテナ入力特性を、ＦＤＴＤ法に基づく計算機シミュレーションにより導出した結果を示す。ここで、分岐素子長Ｌは第１周波数帯における波長換算で０．２７５波長である。なお、ここでいうアンテナ入力特性とは、補助アンテナ結合器１００の給電部と携帯端末１に搭載されたアンテナ素子の給電部との間の周波数ごとの相互結合特性のことである。この相互結合量がゼロに近いほど、補助アンテナ結合器１００と携帯端末１に搭載されたアンテナ素子との間の結合が大きいことを示す。補助アンテナ結合器１００を介して補助アンテナ１０を使用する場合、相互結合量が小さくなるほど損失が増大し補助アンテナ１０の利得を低下させてしまうため、所望の動作周波数帯においてできるだけ高い（例えば−１５ｄＢ以上の）相互結合量を実現する必要がある。図５から、本発明の補助アンテナ結合器１００によれば、第１周波数帯の中心周波数ｆ１において−５ｄＢ以上の相互結合量が、また、第２周波数帯の中心周波数ｆ２において−１５ｄＢ以上の相互結合量がそれぞれ得られることがわかる。 FIG. 5 shows the result of deriving the antenna input characteristics in the power feeding unit 101 of the auxiliary antenna coupler 100 shown in FIG. 1 by computer simulation based on the FDTD method. Here, the branch element length L is 0.275 wavelength in terms of wavelength in the first frequency band. The antenna input characteristic referred to here is a mutual coupling characteristic for each frequency between the power feeding unit of the auxiliary antenna coupler 100 and the power feeding unit of the antenna element mounted on the portable terminal 1. It shows that the coupling | bonding between the auxiliary antenna coupler 100 and the antenna element mounted in the portable terminal 1 is so large that this mutual coupling amount is near zero. When the auxiliary antenna 10 is used via the auxiliary antenna coupler 100, the loss increases and the gain of the auxiliary antenna 10 decreases as the mutual coupling amount decreases, so that it is as high as possible in a desired operating frequency band (for example, −15 dB) It is necessary to realize the above mutual coupling amount. From FIG. 5, according to the auxiliary antenna coupler 100 of the present invention, a mutual coupling amount of −5 dB or more at the center frequency f 1 of the first frequency band and −15 dB or more at the center frequency f 2 of the second frequency band. It can be seen that the mutual bond amounts of are obtained.

図６に、分岐素子長Ｌを変化させた場合の第１、第２周波数帯における相互結合量の変化をＦＤＴＤ法に基づく計算機シミュレーションにより導出した結果を示す。ここで、分岐素子長Ｌは第１周波数帯における中心周波数ｆ１における波長λf1に対する倍率として表している。図６から、分岐素子長Ｌを０．２５〜０．３０λf1とすることで第１周波数帯と第２周波数帯の双方において、概ね−１０ｄＢ以上の相互結合量が得られることがわかる。 FIG. 6 shows a result of deriving a change in the mutual coupling amount in the first and second frequency bands when the branch element length L is changed by a computer simulation based on the FDTD method. Here, the branch element length L is expressed as a magnification with respect to the wavelength λ f1 at the center frequency f 1 in the first frequency band. From FIG. 6, it can be seen that by setting the branch element length L to 0.25 to 0.30λ f1 , a mutual coupling amount of approximately −10 dB or more can be obtained in both the first frequency band and the second frequency band.

次に、本発明の補助アンテナ結合器１００と携帯端末１との相互結合量が、従来の補助アンテナ結合器２００と比べ、携帯端末１との位置関係の変化や携帯端末１内のアンテナ素子の搭載位置の変化の影響を受けにくいことを明らかにする。   Next, the amount of mutual coupling between the auxiliary antenna coupler 100 of the present invention and the portable terminal 1 is different from that of the conventional auxiliary antenna coupler 200 in the positional relationship with the portable terminal 1 and the antenna elements in the portable terminal 1. Clarify that it is less susceptible to changes in mounting position.

図７に、携帯端末１の位置を固定し、従来の補助アンテナ結合器２００と本発明の補助アンテナ結合器１００の位置を、それぞれ図８(a)及び(b)に示すように直交３軸方向（ｘ、ｙ、ｚ）に変化させた場合の相互結合量の変化を、ＦＤＴＤ法に基づく計算機シミュレーションにより第１、第２周波数帯について導出した結果を示す。ここで、図７(a-1)〜(a-3)はそれぞれ従来の補助アンテナ結合器２００のｘ、ｙ、ｚ方向、図７(b-1)〜(b-3)はそれぞれ本発明の補助アンテナ結合器１００のｘ、ｙ、ｚ方向についてのものである。なお、初期位置（ｘ、ｙ、ｚ）＝（０、０、０）は、補助アンテナ結合器２００については非特許文献１の商品の標準的な使用位置とし、補助アンテナ結合器１００については携帯端末１の対向面と平行であり、かつ、給電部１０１が携帯端末１の中央部と対向し、各分岐素子１０２が携帯端末１の長手方向を向く位置とした。図７から、第１周波数帯においては従来構成、本発明の構成とも直交３軸方向に変化させても相互結合量に大きな変化は生じないが、本発明の構成の方が全般的に高い相互結合量が得られることがわかる。一方、第２周波数帯においては、従来構成では各方向に１０ｍｍ動かすだけで相互結合量が−１５ｄＢ以下に大きく劣化するのに対し、本発明の構成では大きく動かしても概ね−１５ｄＢ以上の相互結合量が得られていることがわかる。   In FIG. 7, the position of the portable terminal 1 is fixed, and the positions of the conventional auxiliary antenna coupler 200 and the auxiliary antenna coupler 100 of the present invention are arranged in three orthogonal axes as shown in FIGS. 8 (a) and 8 (b), respectively. The result of having derived | led-out the change of the mutual coupling amount at the time of changing to a direction (x, y, z) about the 1st, 2nd frequency band by the computer simulation based on the FDTD method is shown. Here, FIGS. 7 (a-1) to (a-3) are the x, y, and z directions of the conventional auxiliary antenna coupler 200, respectively, and FIGS. 7 (b-1) to (b-3) are the present invention. The auxiliary antenna coupler 100 in the x, y, and z directions. The initial position (x, y, z) = (0, 0, 0) is the standard use position of the product of Non-Patent Document 1 for the auxiliary antenna coupler 200, and the auxiliary antenna coupler 100 is portable. It is parallel to the facing surface of the terminal 1, the power feeding unit 101 is opposed to the central part of the mobile terminal 1, and each branch element 102 is in a position facing the longitudinal direction of the mobile terminal 1. From FIG. 7, in the first frequency band, even if the conventional configuration and the configuration of the present invention are changed in the orthogonal three-axis directions, the mutual coupling amount does not change greatly, but the configuration of the present invention is generally higher in mutual relationship. It can be seen that the amount of binding can be obtained. On the other hand, in the second frequency band, the amount of mutual coupling greatly deteriorates to −15 dB or less by simply moving 10 mm in each direction in the conventional configuration, whereas the amount of mutual coupling in the configuration of the present invention is approximately −15 dB or more even if it is moved greatly. It can be seen that the quantity is obtained.

また、図９に携帯端末１のアンテナ素子搭載位置２を図１０(a)〜(d)に示す４通りに変化させた場合の補助アンテナ結合器との相互結合量の変化を、ＦＤＴＤ法に基づく計算機シミュレーションにより第１、第２周波数帯について導出した結果を示す。図９は、(a)が従来の補助アンテナ結合器２００に対するものであり、(b)が本発明の補助アンテナ結合器１００に対するものである。また、図１０は、(a)はアンテナ素子搭載位置２の基準構成、(b)は(a)と搭載位置は同じであるが搭載されたアンテナ素子が反転されている構成、(c)も(a)と搭載位置は同じであるが上下基板の接続ケーブルの位置を逆（紙面上(a)は右側、(c)は左側）にした構成、(d)が搭載位置を端末最下部とした構成である。なお、携帯端末１と対向配置する補助アンテナ結合器２００は非特許文献１の商品の標準的な使用位置に固定し、補助アンテナ結合器１００は携帯端末１の対向面と平行に、かつ、給電部１０１が携帯端末１の中央部と対向し、各分岐素子１０２が携帯端末１の長手方向を向く位置に固定している。図９から、第１周波数帯においては従来構成、本発明の構成とも相互結合量は−１５ｄＢ以上得られているが、従来構成ではアンテナ素子搭載位置の相違によるばらつきが大きいのに対し、本発明の構成ではばらつきが小さい。一方、第２周波数帯においては、従来構成では(d)の場合に相互結合量が−１５ｄＢ以下に大きく劣化するのに対し、本発明の構成では第１周波数帯同様、アンテナ素子搭載位置の相違によるばらつきは小さい。   FIG. 9 shows the change in the amount of mutual coupling with the auxiliary antenna coupler when the antenna element mounting position 2 of the mobile terminal 1 is changed in four ways shown in FIGS. 10 (a) to 10 (d). The result derived | led-out about the 1st, 2nd frequency band by the computer simulation based on this is shown. In FIG. 9, (a) is for the conventional auxiliary antenna coupler 200, and (b) is for the auxiliary antenna coupler 100 of the present invention. 10A is a reference configuration of the antenna element mounting position 2, FIG. 10B is a configuration where the mounting position is the same as that of FIG. 10A, but the mounted antenna element is inverted, and FIG. The mounting position is the same as (a), but the connection cable position of the upper and lower boards is reversed (on the paper (a) is the right side, (c) is the left side), and (d) is the mounting position at the bottom of the terminal. This is the configuration. Note that the auxiliary antenna coupler 200 disposed opposite to the mobile terminal 1 is fixed at a standard use position of the product of Non-Patent Document 1, and the auxiliary antenna coupler 100 is parallel to the facing surface of the mobile terminal 1 and is fed. The part 101 is opposed to the central part of the mobile terminal 1, and each branch element 102 is fixed at a position facing the longitudinal direction of the mobile terminal 1. From FIG. 9, in the first frequency band, a mutual coupling amount of -15 dB or more is obtained for both the conventional configuration and the configuration of the present invention. In the conventional configuration, the variation due to the difference in the antenna element mounting position is large. In this configuration, the variation is small. On the other hand, in the second frequency band, in the conventional configuration, the mutual coupling amount is greatly degraded to −15 dB or less in the case of (d), whereas in the configuration of the present invention, the difference in antenna element mounting position is the same as in the first frequency band. Variation due to is small.

以上のように、本発明の補助アンテナ結合器１００によれば、携帯端末との相互結合量が携帯端末との位置関係の変化や携帯端末内のアンテナ素子搭載位置の相違の影響を受けにくいため、携帯端末の形状やアンテナ素子搭載位置によらず共通に用いることができ、かつ、１つの結合器で２つの周波数帯で補助アンテナの利用が可能となる。   As described above, according to the auxiliary antenna coupler 100 of the present invention, the mutual coupling amount with the mobile terminal is not easily affected by the change in the positional relationship with the mobile terminal or the difference in the antenna element mounting position in the mobile terminal. It can be used in common regardless of the shape of the mobile terminal and the antenna element mounting position, and the auxiliary antenna can be used in two frequency bands with one coupler.

１ 携帯端末 ２ アンテナ素子搭載位置
１０ 補助アンテナ １１ 補助アンテナ給電部
２０ 接続ケーブル
１００、２００ 補助アンテナ結合器
１０１、２０１ 給電部 １０２ａ〜ｄ 分岐素子 ２０２ 結合素子 DESCRIPTION OF SYMBOLS 1 Mobile terminal 2 Antenna element mounting position 10 Auxiliary antenna 11 Auxiliary antenna feeder 20 Connection cable 100, 200 Auxiliary antenna coupler 101, 201 Feeder 102a-d Branch element 202 Coupling element

Claims (2)

略矩形の携帯端末に対向し、かつ当該携帯端末の対向面に対し平行に配置して使用する補助アンテナ結合器であって、
給電部と、
一端が上記給電部に接続され、他端が開放された４本の分岐素子と、
上記給電部から分岐されて延伸され、補助アンテナと接続可能な接続ケーブルと、
を備え、
上記給電部が上記携帯端末の中央部と対向している状態において、
上記４本の分岐素子のうち２本は、上記給電部から放射状に上記携帯端末の長手方向の一辺に概ね沿って、互いに逆向きに延伸され、
残りの２本は、上記給電部から放射状に上記携帯端末の長手方向の他辺に概ね沿って、互いに逆向きに延伸された
補助アンテナ結合器。 Auxiliary antenna coupler that is used in opposition to a substantially rectangular portable terminal and arranged in parallel to the facing surface of the portable terminal,
A power feeding unit;
Four branch elements having one end connected to the power supply unit and the other end opened;
A connecting cable that is branched and extended from the power feeding unit and can be connected to the auxiliary antenna,
With
In the state where the power feeding unit faces the central part of the mobile terminal,
Two of the four branch elements are extended in opposite directions from each other along the one side in the longitudinal direction of the mobile terminal radially from the power feeding unit,
The remaining two are auxiliary antenna couplers that extend radially opposite from each other along the other side in the longitudinal direction of the mobile terminal in a radial manner from the power feeding unit. 請求項１に記載の補助アンテナ結合器であって、
上記分岐素子の素子長が、所定の周波数帯において０．２５〜０．３０波長の長さである補助アンテナ結合器。 The auxiliary antenna coupler according to claim 1, wherein
An auxiliary antenna coupler in which the element length of the branch element is 0.25 to 0.30 wavelength in a predetermined frequency band.
JP2009177565A 2009-07-30 2009-07-30 Auxiliary antenna coupler Expired - Fee Related JP5351647B2 (en)

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JPH05199132A (en) * 1992-01-20 1993-08-06 Sharp Corp Reception system
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US5852421A (en) * 1996-04-02 1998-12-22 Qualcomm Incorporated Dual-band antenna coupler for a portable radiotelephone
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