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2006 Fiscal Year Final Research Report Summary

Research on Electromagnetic Measurement System Using Modulated Scattering Elements

Research Project

Project/Area Number 17560300
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Electron device/Electronic equipment
Research InstitutionTohoku University

Principal Investigator

CHEN Qiang  Tohoku University, Graduate School of Engineering, Associate Professor, 大学院工学研究科, 助教授 (30261580)

Project Period (FY) 2005 – 2006
Keywordsantenna / measurement / electromagnetic field / radiation efficiency / radiation pattern / modulation
Research Abstract

It is required to measure the radiation efficiency of antennas of mobile phones and PHS accurately and rapidly, because the electromagnetic radiation from the antenna is partially observed by user's human body. In this research, a simultaneous measurement method using the parallel modulation technique has been proposed. The modulated probe element and the measurement system for radiation efficiency measurement have been developed for commercial use.
1. Accuracy improvement of the system. A directive antenna composed of a dipole and a reflector has been developed to increase the gain of the receiving antennas and improve the measurement accuracy. The frequency of local signal has bee adjusted to decrease the noise caused by the modulation. Furthermore, the mutual coupling analysis has been carried out to optimize the location of the probe array.
2. Broad bandwidth design of the system. The probe array has been designed to meet the requirement of the bandwidth of 800MHz-2.8GHz.
3. A 3-D antenna radiation measurement system has also been developed. The radiation efficiency of antennas has been measured by the system and the measurement results have been compared with the numerical results. It has been demonstrated that radiation efficiency of antennas can be measured rapidly with a satisfactory accuracy in about 16 seconds.
4. Phase measurement. It has been studied how to measure the phase information of the electromagnetic field. However, the investigation has found phase measurement difficult because of the delay effect of the feeding cables and modulation circuits of each probe. This part of research becomes the future work of challenge.

  • Research Products

    (15 results)

All 2007 2006 2005

All Journal Article (14 results) Patent(Industrial Property Rights) (1 results)

  • [Journal Article] Preconditioners for CG-FMM-FFT Implementation in EM Analysis of Large-Scale Periodic Array Antennas2007

    • Author(s)
      H.Q.Zhai
    • Journal Title

      IEICE Transactions on Communications E90B・3

      Pages: 707-710

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Numerical analysis of wall material effect on indoor MIMO channel capacity2006

    • Author(s)
      X.P.Yang
    • Journal Title

      IEICE Transactions on Communications E89B・10

      Pages: 2949-2951

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Performance of adaptive array antenna with arbitrary geometry in the presence of mutual coupling2006

    • Author(s)
      Q.Yuan
    • Journal Title

      IEEE Transactions on Antennas and Propagation 54・7

      Pages: 1991-1996

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Analysis of large-scale periodic array antennas by CG-FFT combined with equivalent sub-array preconditioner2006

    • Author(s)
      H.Q.Zhai
    • Journal Title

      IEICE Transactions on Communications E89B・3

      Pages: 922-928

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Numerical analysis of wall material effect on indoor MIMO channel capacity2006

    • Author(s)
      X.P.Yang
    • Journal Title

      IEICE Transactions on Communications vol. E89B, no. 10

      Pages: 2949-2951

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Performance of adaptive array antenna with arbitrary geometry in the presence of mutual coupling2006

    • Author(s)
      Q.Yuan
    • Journal Title

      IEEE Transactions on Antennas and Propagation vol. 54, no. 7

      Pages: 1991-1996

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Analysis of large-scale periodic array antennas by CG-FFT combined with equivalent sub-array nreconditioner2006

    • Author(s)
      H.Q.Zhai
    • Journal Title

      IEICE Transactions on Communications vol. E89B, no. 3

      Pages: 922-928

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Preconditioners for CG-FMM-FFT Implementation in EM Analysis of Large-Scale Periodic Array Antennas2006

    • Author(s)
      H.Q.Zhai
    • Journal Title

      IEICE Transactions on Communications vol. E90B, no. 3

      Pages: 707-710

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Convergence of SOR in MoM analysis of array antenna2005

    • Author(s)
      Q.Chen
    • Journal Title

      IEICE Transactions on Communications E88B・5

      Pages: 2220-2223

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Accurate DOA estimation using array antenna with arbitrary geometry2005

    • Author(s)
      Q.Yuan
    • Journal Title

      IEEE Transactions on Antennas and Propagation 53・4

      Pages: 1352-1357

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Modulated scattering array antennas for mobile handsets2005

    • Author(s)
      Q.Yuan
    • Journal Title

      IEICE Electronics Express 2・20

      Pages: 519-522

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Convergence of SOR in MoM analysis of array antenna2005

    • Author(s)
      Q.Chen
    • Journal Title

      IEICE Transactions on Communications vol. E88B, no. 5

      Pages: 2220-2223

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Accurate DOA estimation using array antenna with arbitrary geometry2005

    • Author(s)
      Q.Yuan
    • Journal Title

      IEEE Transactions on Antennas and Propagation vol. 53, no. 4

      Pages: 1352-1357

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Modulated scattering array antennas for mobile handsets2005

    • Author(s)
      Q.Yuan
    • Journal Title

      IEICE Electronics Express vol. 2, no.20

      Pages: 519-522

    • Description
      「研究成果報告書概要(欧文)」より
  • [Patent(Industrial Property Rights)] 電磁界測定装置2005

    • Inventor(s)
      陳強(他4名)
    • Industrial Property Rights Holder
      デバイス(株)
    • Patent Publication Number
      特開2006-234602
    • Filing Date
      2005-02-25
    • Description
      「研究成果報告書概要(和文)」より

URL: 

Published: 2008-05-27  

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