Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference (한국전기전자재료학회:학술대회논문집)

The Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회)
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Determination of Microwave Dielectric Properties of Grain by Free Space Transmission Method

자유공간 전송방법을 이용한 마이크로파 유전특성연구

  • 김종헌 (광운대학교 공대 전파공학과) ;
  • 김기복 (서울대학교 농대 농공학과) ;
  • 노상하 (서울대학교 농대 농공학과)
  • Published : 1997.04.01
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Abstract

A free sparse transmission method using X-band standard gain horn antenna is applied to measure the attenuation and phase shift of microwave signal through the wetted grain such as rough rice, brown rice and barley. The moisture content of grain varied from 11 to 25% based on its wetted condition. The dielectric constant and loss factor, which depend on the moisture content of the wetted grain are obtained from the measured attenuation and phase shift by vector network analyzer. The measured values of dielectric constants as a function of moisture density are compared with values of those obtained using the predicted model for estimating dielectric constants of grain.

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