アンテナ近傍の周囲反射物体による近傍界/遠方界に対する影響に関する解析的検討(シミュレーション技術,一般)  [in Japanese] An Analytical Study on Affection of Reflective Objects around an Antenna on Near-field / Far-field  [in Japanese]

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Abstract

本報告では,λ/2ダイポールアンテナ周囲に金属フレームを配置した場合において,その内側に設けた観測面上の近傍電磁界に対する影響について解析的に検討を行い,さらに,同観測面上の電磁界を用いてニアファー変換を行うことで,遠方界への影響についても同時に検討を行った.具体的には,まずλ/2ダイポールアンテナ周囲を囲む仮想閉空間上の近傍電磁界サンプリング間隔が遠方界の推定精度に及ぼす影響について検討を行い,その収束性を確認した.次に,金属フレームを配置した場合における近傍電磁界の振幅分布・位相分布の解析値を用いて遠方界の推定を行った結果,金属フレームを配置有無による遠方界推定値は,相対的な差異0.43dB以内であり,この場合,金属フレームによる影響は小さいことが分かった.

In this report, Near-field around a λ/2 dipole antenna, surrounded by a metal frame, was analytically examined, and Far-field radiations were also examined by the method of near-field to far-field transformation, using the analyzed field-data. At first, accuracy of far-field estimation due to near-field sampling, which divides virtual closed surface surrounding an antenna, was examined by only λ/2 dipole antenna, and the convergence of estimation was clarified. Next, Amplitude and phase distributions around a λ/2 dipole antenna surrounded by a metal frame were examined, and far-field radiation characteristics were estimated using the analyzed field-data. As a result, relative differences of estimated values, between with / without metal frames, is within 0.426 dB. Hence the affection on estimation accuracy due to metal frame, surrounding a λ/2 dipole antenna, is a little in this case.

Journal

電子情報通信学会技術研究報告. EST, エレクトロニクスシミュレーション   [List of Volumes]

電子情報通信学会技術研究報告. EST, エレクトロニクスシミュレーション 111(224), 39-44, 2011-09-29  [Table of Contents]

The Institute of Electronics, Information and Communication Engineers

References:  4

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Codes

  • NII Article ID (NAID) :
    110008899803
  • NII NACSIS-CAT ID (NCID) :
    AA12526305
  • Text Lang :
    JPN
  • Article Type :
    ART
  • ISSN :
    0913-5685
  • NDL Article ID :
    023340470
  • NDL Call No. :
    Z16-940
  • Databases :
    CJP  NDL  NII-ELS