JP2008042651A - Communication apparatus and method of adjusting resonance frequency - Google Patents

Communication apparatus and method of adjusting resonance frequency Download PDF

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JP2008042651A
JP2008042651A JP2006215949A JP2006215949A JP2008042651A JP 2008042651 A JP2008042651 A JP 2008042651A JP 2006215949 A JP2006215949 A JP 2006215949A JP 2006215949 A JP2006215949 A JP 2006215949A JP 2008042651 A JP2008042651 A JP 2008042651A
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antenna
antenna element
guide
rod
communication device
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JP4819614B2 (en
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Naoki Tatsuzawa
直樹 龍澤
Kazunori Hoshino
和則 星野
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Casio Hitachi Mobile Communications Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To adjust resonance frequencies of antenna elements by reducing magnetic coupling between neighboring antenna elements. <P>SOLUTION: A communication apparatus 1 is equipped with a rod antenna 30 that is a first antenna element, an antenna guide 10 in which the rod antenna 30 is housed, and a second antenna element 40 that is disposed adjacently to the antenna guide 10. In the antenna guide 10, a tubular magnetic substance sheet 11 is provided in its outer circumferential portion adjacent to the second antenna element 40. The magnetic substance sheet 11 is provided with a slit 12 in an axial direction. Magnetic coupling between the rod antenna 30 housed in the antenna guide 10 and the second antenna element 40 is reduced by the magnetic substance sheet 11, and antenna performance such as antenna gains or reception sensitivity of the antenna elements can be maintained. Furthermore, since the magnetic substance sheet 11 is provided with the slit 12, the resonance frequency of the second antenna element 40 can be adjusted. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、通信機器及び共振周波数の調整方法に関する。   The present invention relates to a communication device and a method for adjusting a resonance frequency.

近年、携帯電話機に代表される携帯用の通信機器では、高機能化が要求され、近接非接触通信機能、地上デジタルテレビ受信機能、ＧＰＳ機能等を備えたものが開発されている。   In recent years, portable communication devices typified by mobile phones are required to have higher functions, and those equipped with a proximity non-contact communication function, a digital terrestrial television reception function, a GPS function, and the like have been developed.

これらの機能にはそれぞれアンテナ素子が必要であり、アンテナ素子が多数化する一方、携帯用の通信機器には小型化、軽量化の要求があるため、アンテナ素子同士やアンテナ素子と通信機器内の回路等の導電体を近接して配置する必要がある。このため、アンテナ素子同士やアンテナ素子と通信機器内の導電体とが近接することにより電磁結合し、アンテナ素子の同調が崩れたり回路に渦電流が発生したりして通信機能が低下するおそれがあり、これを回避する必要がある。   Each of these functions requires an antenna element, and the number of antenna elements is increased. On the other hand, portable communication devices are required to be smaller and lighter. It is necessary to arrange conductors such as circuits close to each other. For this reason, there is a possibility that the antenna elements may be electromagnetically coupled when they are close to each other or between the antenna elements and the conductor in the communication device, and the communication function may be deteriorated due to the loss of tuning of the antenna elements or the generation of eddy currents in the circuit. There is a need to avoid this.

そこで、アンテナ素子と導電体との影響を低減するために、アンテナ素子と導電体との間に磁性体シートを配置する等の対策がとられている（例えば、特許文献１参照）。
特開２００５−１２２５９５号公報 Therefore, in order to reduce the influence of the antenna element and the conductor, measures such as arranging a magnetic sheet between the antenna element and the conductor are taken (for example, see Patent Document 1).
JP 2005-122595 A

ところで、上記従来技術では、二つのアンテナ素子同士が隣接して配置されると、アンテナ素子間の磁気結合により共振周波数が変化し、各アンテナ素子のアンテナ利得や受信感度等のアンテナ性能が変化する。   By the way, in the above prior art, when two antenna elements are arranged adjacent to each other, the resonance frequency changes due to the magnetic coupling between the antenna elements, and the antenna performance such as antenna gain and reception sensitivity of each antenna element changes. .

また、各アンテナ素子を送受信すべき電波の周波数帯に対応するよう調整する場合においても、アンテナ素子間の磁気結合が強いと、相互に干渉し合い、あるアンテナ素子を所定の周波数帯に対応するよう調整しても、この調整量に応じて隣接する他のアンテナ素子の対応可能な周波数帯がシフトするため、調整が煩雑になるという問題がある。   In addition, when adjusting each antenna element to correspond to the frequency band of the radio wave to be transmitted / received, if the magnetic coupling between the antenna elements is strong, the antenna elements interfere with each other, and a certain antenna element corresponds to a predetermined frequency band. Even if such adjustment is performed, the frequency band that can be accommodated by other antenna elements adjacent to each other shifts in accordance with the adjustment amount, so that there is a problem that adjustment becomes complicated.

本発明の課題は、互いに異なる周波数帯の電波の送受信を行う複数のアンテナ素子を備えた通信機器において、隣接するアンテナ素子間の磁気結合を低減し、アンテナ素子の共振周波数を調整することである。   An object of the present invention is to reduce the magnetic coupling between adjacent antenna elements and adjust the resonance frequency of the antenna elements in a communication device including a plurality of antenna elements that transmit and receive radio waves in different frequency bands. .

以上の課題を解決するため、請求項１に記載の発明は、第１のアンテナ素子であるロッドアンテナと、ロッドアンテナが収納されるアンテナガイドと、アンテナガイドに隣接して配置された第２のアンテナ素子とを備える通信機器において、前記アンテナガイドには前記第２のアンテナ素子との隣接する外周部に筒状の磁性体シートが設けられていることを特徴とする。   In order to solve the above-described problems, the invention according to claim 1 includes a rod antenna that is a first antenna element, an antenna guide that houses the rod antenna, and a second antenna that is disposed adjacent to the antenna guide. In a communication device including an antenna element, the antenna guide is provided with a cylindrical magnetic sheet on an outer peripheral portion adjacent to the second antenna element.

請求項２に記載の発明は、請求項１に記載の通信機器であって、前記磁性体シートには軸方向にスリットが設けられていることを特徴とする。   A second aspect of the present invention is the communication device according to the first aspect, wherein the magnetic sheet is provided with a slit in the axial direction.

請求項３に記載の発明は、請求項１または２に記載の通信機器であって、前記第２のアンテナ素子に隣接して配置された第３のアンテナ素子をさらに備えることを特徴とする。   A third aspect of the present invention is the communication apparatus according to the first or second aspect, further comprising a third antenna element disposed adjacent to the second antenna element.

請求項４に記載の発明は、請求項３に記載の通信機器であって、前記ロッドアンテナは地上デジタルテレビ放送用のアンテナ素子であり、前記第２のアンテナ素子は近接非接触通信用のアンテナ素子であり、前記第３のアンテナ素子は携帯電話通信用のアンテナ素子であることを特徴とする。   The invention according to claim 4 is the communication device according to claim 3, wherein the rod antenna is an antenna element for digital terrestrial television broadcasting, and the second antenna element is an antenna for proximity non-contact communication. And the third antenna element is an antenna element for mobile phone communication.

請求項５に記載の発明は、第１のアンテナ素子であるロッドアンテナと、ロッドアンテナが収納されるアンテナガイドと、アンテナガイドに隣接して配置された第２のアンテナ素子と、第２のアンテナ素子に隣接して配置された第３のアンテナ素子とを備える通信機器の共振周波数の調整方法であって、前記アンテナガイドの前記第２のアンテナ素子との隣接する外周部に筒状の磁性体シートを設け、この磁性体シートに軸方向にスリットを設けることにより、前記第２のアンテナ素子の共振周波数を第３のアンテナ素子の通信周波数帯から除外することを特徴とする共振周波数の調整方法である。   The invention according to claim 5 is a rod antenna as a first antenna element, an antenna guide in which the rod antenna is housed, a second antenna element disposed adjacent to the antenna guide, and a second antenna. A method for adjusting a resonance frequency of a communication device including a third antenna element disposed adjacent to an element, wherein a cylindrical magnetic body is provided on an outer peripheral portion of the antenna guide adjacent to the second antenna element. A resonance frequency adjusting method, characterized in that a resonance frequency of the second antenna element is excluded from a communication frequency band of the third antenna element by providing a sheet and providing a slit in the axial direction in the magnetic sheet. It is.

本発明によれば、ロッドアンテナが収納されるアンテナガイドの第２のアンテナ素子との隣接部に筒状の磁性体シートを設けることで、アンテナガイドに収納されるロッドアンテナと第２のアンテナ素子との磁気結合が低減され、各アンテナ素子のアンテナ利得や受信感度等のアンテナ性能を維持することができる。また、磁性体シートにスリットを設けることで、第２のアンテナ素子の共振周波数を調整することができる。   According to the present invention, the rod antenna and the second antenna element accommodated in the antenna guide are provided by providing the cylindrical magnetic sheet in the adjacent portion of the antenna guide in which the rod antenna is accommodated with the second antenna element. And the antenna performance such as antenna gain and reception sensitivity of each antenna element can be maintained. Moreover, the resonant frequency of a 2nd antenna element can be adjusted by providing a slit in a magnetic material sheet.

以下、本発明を適用した通信機器の実施形態について詳細に説明する。
図１は複数のアンテナ素子を備える通信機器１を示す回路ブロック図である。 Hereinafter, embodiments of a communication device to which the present invention is applied will be described in detail.
FIG. 1 is a circuit block diagram showing a communication device 1 having a plurality of antenna elements.

通信機器１は、メインアンテナ２０、ロッドアンテナ３０、ＲＦＩＤ（Radio Frequency Identification）アンテナ４０の３つのアンテナ素子を有し、メインアンテナ２０用の整合回路２１、アンテナスイッチ２２、送受信回路２３、ロッドアンテナ３０用の整合回路３１、受信回路３２、ＯＦＤＭ復調回路３３、ＲＦＩＤアンテナ４０用の整合回路４１、受信回路４２、検波回路４３、及びこれらの回路を制御する制御ＣＰＵ５０を備える。   The communication device 1 includes three antenna elements, a main antenna 20, a rod antenna 30, and an RFID (Radio Frequency Identification) antenna 40, and includes a matching circuit 21 for the main antenna 20, an antenna switch 22, a transmission / reception circuit 23, and a rod antenna 30. A matching circuit 31, a receiving circuit 32, an OFDM demodulating circuit 33, a matching circuit 41 for the RFID antenna 40, a receiving circuit 42, a detecting circuit 43, and a control CPU 50 for controlling these circuits.

メインアンテナ２０は携帯電話通信用の８００ＭＨｚ近傍、２ＧＨｚ近傍の２帯域に対応している。８００ＭＨｚ近傍の帯域は、受信帯域を８４３〜８７０ＭＨｚ、送信帯域を８９８〜９２５ＭＨｚとし、２ＧＨｚ近傍の帯域は受信帯域を２１１０〜２１３０ＭＨｚ、送信帯域を１９２０〜１９４０ＭＨｚとする。   The main antenna 20 corresponds to two bands near 800 MHz and 2 GHz for mobile phone communication. The band near 800 MHz has a reception band of 843 to 870 MHz, the transmission band 898 to 925 MHz, and the band near 2 GHz has a reception band of 2110 to 2130 MHz and a transmission band of 1920 to 1940 MHz.

整合回路２１はコイルとコンデンサを組み合わせてなり、メインアンテナ２０とアンテナスイッチ２２側とのインピーダンスを整合する。アンテナスイッチ２２は整合回路２１と送受信回路２３内の送信回路または受信回路のいずれか一方とを接続する。受信回路は、メインアンテナ２０が受信し、整合回路２１、アンテナスイッチ２２を通過した信号のフィルタリング、周波数変換、増幅等を行い、復調、Ａ／Ｄ変換等の処理を行った後、制御ＣＰＵ５０へ出力する。送信回路は制御ＣＰＵ５０より入力された信号に、Ｄ／Ａ変換、変調、等の信号処理を施した後、アンテナスイッチ２２、整合回路２１を介してメインアンテナ２０に出力する。   The matching circuit 21 is a combination of a coil and a capacitor, and matches the impedance between the main antenna 20 and the antenna switch 22 side. The antenna switch 22 connects the matching circuit 21 and either the transmission circuit or the reception circuit in the transmission / reception circuit 23. The receiving circuit performs filtering, frequency conversion, amplification, etc. of the signal received by the main antenna 20 and passed through the matching circuit 21 and the antenna switch 22, and performs processing such as demodulation and A / D conversion, and then to the control CPU 50. Output. The transmission circuit subjects the signal input from the control CPU 50 to signal processing such as D / A conversion and modulation, and then outputs the signal to the main antenna 20 via the antenna switch 22 and the matching circuit 21.

ロッドアンテナ３０は地上デジタルテレビ放送用の１３ｃｈ（４７３．１４２８５７ＭＨｚ）〜６２ｃｈ（７６７．１４２８５７ＭＨｚ）の帯域に対応している。
整合回路３１はコイルとコンデンサを組み合わせてなり、ロッドアンテナ３０側と受信回路３２側とのインピーダンスを整合する。
受信回路３２はロッドアンテナ３０が受信し、整合回路３１を通過した信号のフィルタリング、周波数変換、増幅等を行った後、ＯＦＤＭ復調回路３３へ出力する。
ＯＦＤＭ復調回路３３は受信回路３２より入力された信号に、復調、Ａ／Ｄ変換、ＦＦＴ処理、パラレル／シリアル変換等の信号処理を施した後、制御ＣＰＵ５０に出力する。 The rod antenna 30 corresponds to a band of 13 ch (473.142857 MHz) to 62 ch (767.142857 MHz) for digital terrestrial television broadcasting.
The matching circuit 31 is a combination of a coil and a capacitor, and matches the impedance between the rod antenna 30 side and the receiving circuit 32 side.
The reception circuit 32 receives the signal from the rod antenna 30 and performs filtering, frequency conversion, amplification, and the like on the signal that has passed through the matching circuit 31, and then outputs the signal to the OFDM demodulation circuit 33.
The OFDM demodulation circuit 33 performs signal processing such as demodulation, A / D conversion, FFT processing, parallel / serial conversion, etc. on the signal input from the receiving circuit 32 and then outputs the signal to the control CPU 50.

ＲＦＩＤアンテナ４０は近接非接触通信用の１３．５６ＭＨｚの通信に対応している。
受信回路４２は、ＲＦＩＤアンテナ４０が受信し、整合回路４１を通過した信号に周波数変換、増幅等を行った後、検波回路４３に出力する。検波回路４３は受信回路より入力された信号を復調し、制御ＣＰＵ５０に出力する。 The RFID antenna 40 corresponds to 13.56 MHz communication for proximity contactless communication.
The reception circuit 42 performs frequency conversion, amplification, etc. on the signal received by the RFID antenna 40 and passed through the matching circuit 41, and then outputs the signal to the detection circuit 43. The detection circuit 43 demodulates the signal input from the reception circuit and outputs it to the control CPU 50.

次に、３つのアンテナ素子の実装構造について説明する。図２は通信機器１本体のメインアンテナ２０、ロッドアンテナ３０、ＲＦＩＤアンテナ４０が組み付けられた部分を示す斜視図であり、図３は図２の分解斜視図である。   Next, a mounting structure of three antenna elements will be described. 2 is a perspective view showing a portion of the communication device 1 main body 20 where the main antenna 20, the rod antenna 30, and the RFID antenna 40 are assembled. FIG. 3 is an exploded perspective view of FIG.

メインアンテナ２０は、誘電体チップアンテナ、メアンダラインアンテナ等のアンテナ素子であり、図２，図３に示すように通信機器１内部の下端部に配置される。
ロッドアンテナ３０は、筒状のアンテナガイド１０に格納され、アンテナガイド１０から引き出して使用可能とされる。アンテナガイド１０は、図２，図３に示すように通信機器１の側端部に配置され、上端からロッドアンテナ３０が挿入される。 The main antenna 20 is an antenna element such as a dielectric chip antenna or a meander line antenna, and is arranged at the lower end portion inside the communication device 1 as shown in FIGS.
The rod antenna 30 is stored in the cylindrical antenna guide 10 and can be used by being pulled out from the antenna guide 10. The antenna guide 10 is disposed at the side end of the communication device 1 as shown in FIGS. 2 and 3, and the rod antenna 30 is inserted from the upper end.

ＲＦＩＤアンテナ４０は導線を複数回巻いたコイルであり、図２，図３に示すようにケーブル状に形成されている。ＲＦＩＤアンテナ４０は通信機器１本体の筐体２に矩形状に配置され、筐体２と、筐体２に嵌合するケーブル押さえ３とにより挟持され、固定される。図２の状態では、ＲＦＩＤアンテナ４０は下部においてメインアンテナ２０と近接し、側部においてアンテナガイド１０と近接する。このため、後述するようにアンテナガイド１０内に格納されるロッドアンテナ３０と、アンテナガイド１０と近接して配置されるＲＦＩＤアンテナ４０との磁気結合強度を低下させるために、アンテナガイド１０の外周部には磁性体シート１１が貼り付けられている。   The RFID antenna 40 is a coil in which a conductive wire is wound a plurality of times, and is formed in a cable shape as shown in FIGS. The RFID antenna 40 is disposed in a rectangular shape on the housing 2 of the communication device 1 main body, and is sandwiched and fixed by the housing 2 and the cable presser 3 fitted to the housing 2. In the state of FIG. 2, the RFID antenna 40 is close to the main antenna 20 at the lower portion and close to the antenna guide 10 at the side portion. For this reason, in order to reduce the magnetic coupling strength between the rod antenna 30 housed in the antenna guide 10 and the RFID antenna 40 disposed close to the antenna guide 10 as described later, the outer peripheral portion of the antenna guide 10 The magnetic material sheet 11 is affixed to.

なお、磁性体シート１１には、アンテナガイド１０に対してＲＦＩＤアンテナ４０と反対側の部分に、軸方向にスリット１２が設けられている。磁性体シート１１にスリット１２を設けることで、後述するように、ＲＦＩＤアンテナ４０とメインアンテナ２０との磁気結合の強度が調整される。   The magnetic sheet 11 is provided with a slit 12 in the axial direction at a portion opposite to the RFID antenna 40 with respect to the antenna guide 10. By providing the slits 12 in the magnetic sheet 11, the strength of magnetic coupling between the RFID antenna 40 and the main antenna 20 is adjusted as will be described later.

ここで、磁性体シート１１の有無によるＲＦＩＤアンテナ４０とロッドアンテナ３０、メインアンテナ２０との磁気結合について説明する。
図４は通信機器１における各アンテナ素子の位置関係を示す模式図であり、図５は磁性体シート１１がない場合、図６は磁性体シート１１がある場合の各アンテナ素子の磁気的な結合関係を示す模式図である。 Here, the magnetic coupling between the RFID antenna 40, the rod antenna 30, and the main antenna 20 depending on the presence or absence of the magnetic sheet 11 will be described.
4 is a schematic diagram showing the positional relationship of each antenna element in the communication device 1. FIG. 5 shows the magnetic coupling of each antenna element when the magnetic sheet 11 is not present, and FIG. It is a schematic diagram which shows a relationship.

図４に示すように、ロッドアンテナ３０をアンテナガイド１０に格納すると、ＲＦＩＤアンテナ４０とアンテナガイド１０に格納された状態のロッドアンテナ３０とが近接する。このため、図５に示すように、ＲＦＩＤアンテナ４０とロッドアンテナ３０との磁気結合が強くなる。   As shown in FIG. 4, when the rod antenna 30 is stored in the antenna guide 10, the RFID antenna 40 and the rod antenna 30 stored in the antenna guide 10 come close to each other. For this reason, as shown in FIG. 5, the magnetic coupling between the RFID antenna 40 and the rod antenna 30 is strengthened.

そこで、アンテナガイド１０の外周部に磁性体シート１１を設けると、図６に示すように、ＲＦＩＤアンテナ４０とロッドアンテナ３０との磁気結合を弱めることができる。しかし、磁性体シート１１を設けると、ＲＦＩＤアンテナ４０のインダクタンスＬ１がＬ２に、静電容量Ｃ１がＣ２に変化し、ＲＦＩＤアンテナ４０の共振周波数がメインアンテナ２０の通信用の周波数帯域にシフトし、この周波数帯域におけるＲＦＩＤアンテナ４０とメインアンテナ２０との磁気結合が強くなる。   Therefore, when the magnetic sheet 11 is provided on the outer periphery of the antenna guide 10, the magnetic coupling between the RFID antenna 40 and the rod antenna 30 can be weakened as shown in FIG. However, when the magnetic material sheet 11 is provided, the inductance L1 of the RFID antenna 40 is changed to L2, the capacitance C1 is changed to C2, and the resonance frequency of the RFID antenna 40 is shifted to the communication frequency band of the main antenna 20, Magnetic coupling between the RFID antenna 40 and the main antenna 20 in this frequency band is strengthened.

これを防ぐために、磁性体シート１１にスリット１２を設け、ＲＦＩＤアンテナ４０のインダクタンスＬ１、静電容量Ｃ１の変化を調整する。これにより、ＲＦＩＤアンテナ４０の共振周波数がメインアンテナ２０の通信用の周波数帯域までシフトすることを防ぐことができ、メインアンテナ２０の利得の低下を抑えることができる。   In order to prevent this, the magnetic sheet 11 is provided with slits 12 to adjust changes in the inductance L1 and the capacitance C1 of the RFID antenna 40. As a result, the resonance frequency of the RFID antenna 40 can be prevented from shifting to the communication frequency band of the main antenna 20, and a decrease in the gain of the main antenna 20 can be suppressed.

次に、アンテナガイドに磁性体シートを設けない場合、スリットがない磁性体シートを設けた場合、スリットがある磁性体シートを設けた場合における、ＲＦＩＤアンテナの共振周波数の変動値、メインアンテナのＶＳＷＲ（Voltage Standing Wave Ratio；電圧定在波比）値、メインアンテナの利得を計測した結果を図７〜図１１に示す。
なお、アンテナガイドの外径は５ｍｍ、磁性体シートを貼り付ける軸方向の長さは５０ｍｍとし、スリットの間隔は１ｍｍとした。 Next, when the magnetic sheet is not provided on the antenna guide, when the magnetic sheet without slits is provided, or when the magnetic sheet with slits is provided, the fluctuation value of the resonance frequency of the RFID antenna, the VSWR of the main antenna The results of measuring the (Voltage Standing Wave Ratio) value and the gain of the main antenna are shown in FIGS.
The outer diameter of the antenna guide was 5 mm, the axial length for attaching the magnetic sheet was 50 mm, and the slit interval was 1 mm.

図７はロッドアンテナのアンテナガイドへの格納時とアンテナガイドからの引き出し時との、ＲＦＩＤアンテナの共振周波数の変動値を示す表である。ＲＦＩＤアンテナの共振周波数の変動値は、図５に示すように、磁性体シートがない場合には、約２３０ｋＨｚであった。一方、磁性体シート（スリットなし）がある場合には約４０ｋＨｚ、磁性体シート（スリットあり）がある場合には約５０ｋＨｚであった。このため、磁性体シートがあることによりロッドアンテナの格納時／引き出し時に関わらず、ＲＦＩＤアンテナの共振周波数を一定の範囲に保つことができる。   FIG. 7 is a table showing fluctuation values of the resonance frequency of the RFID antenna when the rod antenna is stored in the antenna guide and when the rod antenna is pulled out from the antenna guide. As shown in FIG. 5, the fluctuation value of the resonance frequency of the RFID antenna was about 230 kHz when there was no magnetic sheet. On the other hand, when there was a magnetic sheet (without slits), it was about 40 kHz, and when there was a magnetic sheet (with slits), it was about 50 kHz. For this reason, the presence of the magnetic sheet makes it possible to keep the resonance frequency of the RFID antenna in a certain range regardless of when the rod antenna is stored / drawn.

図８は磁性体シートがない場合、図９は磁性体シート（スリットなし）がある場合、図１０は磁性体シート（スリットあり）がある場合の各条件における、周波数とメインアンテナのＶＳＷＲ値との関係を示すグラフである。図８〜図１０に示すように、メインアンテナへ入力した電力が空中へ放射されるために、受信帯域から送信帯域の間にかけてＶＳＷＲ値が低下した。加えて、メインアンテナとＲＦＩＤアンテナとの共振により、メインアンテナへ入力した電力がＲＦＩＤアンテナへ放射されるためにＶＳＷＲ値が低下する周波数（共振点Ａ１〜Ａ３，Ｂ１〜Ｂ３）が存在した（図８〜図１０参照）。   FIG. 8 shows the frequency and the VSWR value of the main antenna in each condition when there is no magnetic sheet, FIG. 9 shows the case where there is a magnetic sheet (without slits), and FIG. 10 shows the case where there is a magnetic sheet (with slits). It is a graph which shows the relationship. As shown in FIGS. 8 to 10, since the power input to the main antenna is radiated into the air, the VSWR value decreased from the reception band to the transmission band. In addition, due to resonance between the main antenna and the RFID antenna, there is a frequency (resonance points A1 to A3, B1 to B3) at which the VSWR value decreases because the power input to the main antenna is radiated to the RFID antenna (see FIG. 8 to FIG. 10).

磁性体シートがない場合には、図８に示すように、共振点Ａ１は送信帯域よりも高い周波数帯に、共振点Ｂ１は受信帯域よりも低い周波数帯にあった。しかし、磁性体シート（スリットなし）がある場合には、図９に示すように、共振点の周波数が低下し、送信帯域よりも高い周波数帯の共振点Ａ１は送信帯域にシフトした（共振点Ａ２）。一方、図１０に示すように、磁性体シート（スリットあり）を設けた場合には、共振点の周波数低下が抑えられ、共振点Ａ１が送信帯域までシフトすることがなかった（共振点Ａ３）。   When there was no magnetic material sheet, as shown in FIG. 8, the resonance point A1 was in a frequency band higher than the transmission band, and the resonance point B1 was in a frequency band lower than the reception band. However, when there is a magnetic sheet (without slits), as shown in FIG. 9, the frequency of the resonance point decreases, and the resonance point A1 in the frequency band higher than the transmission band shifts to the transmission band (resonance point). A2). On the other hand, as shown in FIG. 10, when a magnetic sheet (with slits) was provided, the frequency drop at the resonance point was suppressed, and the resonance point A1 did not shift to the transmission band (resonance point A3). .

図１１は磁性体シートの有無及びスリットの有無による、通信周波数とメインアンテナの利得（ｄＢ）との関係を示すグラフである。図１１に示すように、磁性体シート（スリットなし）を設けた場合には、磁性体シートを設けない場合と比較して、メインアンテナの利得が低下した。一方、磁性体シート（スリットあり）を設けた場合には、磁性体シート（スリットなし）を設けた場合と比較して、メインアンテナの利得の低減が抑えられたことがわかる。   FIG. 11 is a graph showing the relationship between the communication frequency and the gain (dB) of the main antenna depending on the presence / absence of a magnetic sheet and the presence / absence of a slit. As shown in FIG. 11, when the magnetic material sheet (without slits) was provided, the gain of the main antenna was reduced compared to the case where the magnetic material sheet was not provided. On the other hand, it can be seen that when the magnetic sheet (with slits) is provided, the reduction in the gain of the main antenna is suppressed as compared with the case where the magnetic sheet (without slits) is provided.

複数のアンテナ素子を備える通信機器１を示す回路ブロック図である。It is a circuit block diagram showing communication equipment 1 provided with a plurality of antenna elements. 通信機器１本体のメインアンテナ２０、ロッドアンテナ３０、ＲＦＩＤアンテナ４０が組み付けられた部分を示す斜視図である。It is a perspective view which shows the part by which the main antenna 20, the rod antenna 30, and the RFID antenna 40 of the communication apparatus 1 main body were assembled | attached. 図２の分解斜視図である。FIG. 3 is an exploded perspective view of FIG. 2. 通信機器１における各アンテナ素子の位置関係を示す模式図である。2 is a schematic diagram illustrating a positional relationship between antenna elements in the communication device 1. FIG. 磁性体シート１１がない場合の各アンテナ素子の磁気的な結合関係を示す模式図である。It is a schematic diagram which shows the magnetic coupling relationship of each antenna element when there is no magnetic material sheet. 磁性体シート１１がある場合の各アンテナ素子の磁気的な結合関係を示す模式図である。It is a schematic diagram which shows the magnetic coupling relationship of each antenna element in case there exists a magnetic material sheet. ＲＦＩＤアンテナの共振周波数の変動値を示す表である。It is a table | surface which shows the fluctuation value of the resonant frequency of a RFID antenna. 磁性体シートがない場合の周波数とメインアンテナのＶＳＷＲ値との関係を示すグラフである。It is a graph which shows the relationship between the frequency when there is no magnetic material sheet, and the VSWR value of a main antenna. 磁性体シート（スリットなし）がある場合の周波数とメインアンテナのＶＳＷＲ値との関係を示すグラフである。It is a graph which shows the relationship between the frequency when there is a magnetic material sheet (without a slit) and the VSWR value of the main antenna. 磁性体シート（スリットあり）がある場合の周波数とメインアンテナのＶＳＷＲ値との関係を示すグラフである。It is a graph which shows the relationship between the frequency when there exists a magnetic material sheet (with a slit), and the VSWR value of a main antenna. 周波数とメインアンテナの利得との関係を示すグラフである。It is a graph which shows the relationship between a frequency and the gain of a main antenna.

符号の説明Explanation of symbols

１ 通信機器
１０ アンテナガイド
１１ 磁性体シート
１２ スリット
２０ メインアンテナ（第３のアンテナ素子）
３０ ロッドアンテナ（第１のアンテナ素子）
４０ ＲＦＩＤアンテナ（第２のアンテナ素子） 1 Communication Equipment 10 Antenna Guide 11 Magnetic Sheet 12 Slit 20 Main Antenna (Third Antenna Element)
30 Rod antenna (first antenna element)
40 RFID antenna (second antenna element)

Claims (5)

第１のアンテナ素子であるロッドアンテナと、ロッドアンテナが収納されるアンテナガイドと、アンテナガイドに隣接して配置された第２のアンテナ素子とを備える通信機器において、
前記アンテナガイドには前記第２のアンテナ素子との隣接する外周部に筒状の磁性体シートが設けられていることを特徴とする通信機器。 In a communication device including a rod antenna that is a first antenna element, an antenna guide that houses the rod antenna, and a second antenna element that is disposed adjacent to the antenna guide,
A communication device, wherein the antenna guide is provided with a cylindrical magnetic sheet on an outer periphery adjacent to the second antenna element. 前記磁性体シートには軸方向にスリットが設けられていることを特徴とする請求項１に記載の通信機器。   The communication device according to claim 1, wherein a slit is provided in the magnetic material sheet in an axial direction. 前記第２のアンテナ素子に隣接して配置された第３のアンテナ素子をさらに備えることを特徴とする請求項１または２に記載の通信機器。   The communication apparatus according to claim 1, further comprising a third antenna element disposed adjacent to the second antenna element. 前記ロッドアンテナは地上デジタルテレビ放送用のアンテナ素子であり、前記第２のアンテナ素子は近接非接触通信用のアンテナ素子であり、前記第３のアンテナ素子は携帯電話通信用のアンテナ素子であることを特徴とする請求項３に記載の通信機器。   The rod antenna is an antenna element for digital terrestrial television broadcasting, the second antenna element is an antenna element for proximity contactless communication, and the third antenna element is an antenna element for mobile phone communication The communication device according to claim 3. 第１のアンテナ素子であるロッドアンテナと、ロッドアンテナが収納されるアンテナガイドと、アンテナガイドに隣接して配置された第２のアンテナ素子と、第２のアンテナ素子に隣接して配置された第３のアンテナ素子とを備える通信機器の共振周波数の調整方法であって、
前記アンテナガイドの前記第２のアンテナ素子との隣接する外周部に筒状の磁性体シートを設けるとともに、
前記磁性体シートに軸方向にスリットを設けることにより、
前記第２のアンテナ素子の共振周波数を第３のアンテナ素子の通信周波数帯から除外することを特徴とする共振周波数の調整方法。 A rod antenna that is a first antenna element, an antenna guide that houses the rod antenna, a second antenna element that is disposed adjacent to the antenna guide, and a second antenna element that is disposed adjacent to the second antenna element. 3 is a method for adjusting a resonance frequency of a communication device including the antenna element of 3,
While providing a cylindrical magnetic sheet on the outer periphery of the antenna guide adjacent to the second antenna element,
By providing a slit in the axial direction in the magnetic sheet,
A method for adjusting a resonance frequency, wherein the resonance frequency of the second antenna element is excluded from the communication frequency band of the third antenna element.
JP2006215949A 2006-08-08 2006-08-08 Communication device and method for adjusting resonance frequency Expired - Fee Related JP4819614B2 (en)

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JP2002171109A (en) * 2000-11-30 2002-06-14 Toshiba Corp Mobile communication terminal and antenna mounting structure used therefor
JP2005333244A (en) * 2004-05-18 2005-12-02 Mitsubishi Electric Corp Mobile telephone set
JP2006180193A (en) * 2004-12-22 2006-07-06 Matsushita Electric Ind Co Ltd Antenna device and mobile wireless communication apparatus

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JPH1042013A (en) * 1996-07-25 1998-02-13 Daido Steel Co Ltd Portable telephone
JP2002057519A (en) * 2000-08-08 2002-02-22 Daido Steel Co Ltd Radio wave reducing device for portable telephone
JP2002171109A (en) * 2000-11-30 2002-06-14 Toshiba Corp Mobile communication terminal and antenna mounting structure used therefor
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