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Development of Time Domain EMC Measuring Technology

Research Project

Project/Area Number 04044022
Research Category

Grant-in-Aid for international Scientific Research

Allocation TypeSingle-year Grants
SectionJoint Research
Research InstitutionTohoku University

Principal Investigator

TAKAGI Tasuku  Faculty of Engineering, Tohoku University, 工学部, 教授 (30005235)

Co-Investigator(Kenkyū-buntansha) TOKUDA Masamitu  NTT, EMC研究グループ, リーダー
KANDA Motohisa  NIST, 研究室長
BABA Kenzo  Research Institute for Scientific Measurements, Tohoku University, 科学計測研究所, 助教授 (40006151)
Project Period (FY) 1992
Project Status Completed (Fiscal Year 1992)
Budget Amount *help
¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 1992: ¥2,300,000 (Direct Cost: ¥2,300,000)
KeywordsTime Domain / EMC / Electromagnetic Compatibility / Impulse Noise / Antenna / 不要電磁波 / アンテナ
Research Abstract

The time domain technique is a powerful method for measuring the characteristic phenomena induced by impulse noise. In order to discuss the recent developments of the time domain and related techniques in connection with the electromagnetic compatibility (EMC), we visited the National Institute of Standards and Technology (NIST) in the USA and several research institutes in Japan.
The reflected electromagnetic wave from an absorber, which is placed at the front wall in an anechoic chamber, has been observed by the time domain method, at NIST. They evaluated the reflection coefficients in a frequency region between 30 MHz and 1 GHz. They successfully eliminated reflections from the floor, the left and right walls, the ceiling and the cart, and also the reflection within the antennas
Two types of antennas have been developed by NTT in Japan. One of them is a spherical dipole antenna with optical fiber which enables us to calculate the radiated electric field strength precisely. It can cover frequency range between 30 MHz and 1 GHz, and can radiate even an impulse. The second one is a receiving antenna with electric field sensor based on the integrated optical circuit technique with high sensitivity. An electromagnetic impulse of width wider than 5 ns and peak height larger than 10 V/m can be measured with this sensor.
Moreover, many studies have been done with special attentions on the electrical properties of materials, the random burst noise, the electric and electronic circuits, electrostatic discharge, the characteristic impedance of TEM cell, reproduces of electromagnetic environments in an anechoic chamber and so on.
In view of these developments, we are convinced that the time domain technique can be an effective method to characterize impulse noise associated with EMC problems, although there are many practical problems for future studies.

Report

(1 results)
  • 1992 Final Research Report Summary
  • Research Products

    (8 results)

All Other

All Publications (8 results)

  • [Publications] 馬場健造: "結晶の電気的特性測定のためのタイムドメイン法" 精密電磁気計測国際学会(パリ). 9-12JUN. 109-110 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] 馬場健造: "タイムドメイン法による生物試料の電気的特性の広帯域測定" 電子情報通信学会技術研究報告. EMCJ92-82. 19-24 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] 神田元久: "NISTにおけるEMIの研究と発展および将来展望" 電子情報通信学会技術研究報告. EMCJ92-86. 45-46 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] 馬場健造: "わずかに酸素が欠乏したルチル結晶の電気的特性測定のための時間領域法" 応用物理学会欧文誌(JJAP).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Kenzo Baba: "TIME DOMAIN SPECTROSCOPY FOR MEASUREMENT OF THE ELECTRICAL PROPERTIES OF CRYSTALS" CONFERENCE ON PRECISION ELECTROMAGNETIC MEASUREMENT (PARIS-FRANCE). 9-12JUIN. 109-110 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Kenzo Baba: "Broad-Band Time Domain Spectroscopy for Measurement of the Electrical Properties of Biological Substances" Technical Report of IEICE. EMCJ92-82. 19-24 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Motohisa Kanda: "EMI Research and Development at NIST and their Future Directions" Technical Report of IEICE. EMCJ92-86. 45-46 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary
  • [Publications] Kenzo Baba: "Time Domain Spectroscopy for Electrical Properties of a Slightly Reduced Rutile Crystal" Jpn.J.Appl.Phys.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1992 Final Research Report Summary

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Published: 1992-04-01   Modified: 2016-04-21  

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