An automated amplitudes-only measurement system for permittivity determination using free-space method


Akay M. F. , Kharkovsky S. N. , Hasar U.

18th IEEE Instrumentation and Measurement Technology Conference (IMTC/2001), Budapest, Hungary, 21 - 23 May 2001, pp.503-506 identifier identifier

  • Publication Type: Conference Paper / Full Text
  • Volume:
  • City: Budapest
  • Country: Hungary
  • Page Numbers: pp.503-506

Abstract

An automated PC based free-space system for determining the permittivity of high-loss materials is proposed. The main feature of the system is to measure only the amplitudes of transmission and reflection coefficients using free-space method and determine the permittivity dynamically using a computer. Firstly, the expressions for the reflection and transmission coefficients involving the permittivity of the high-loss material are derived. Then these equations are solved together by using the halving method. In order to measure the amplitudes of reflection and transmission coefficients, a simple and inexpensive microwave measurement system is established. The parallel port is used as an interface between the computer and the designed control circuit. A software program is developed for the treatment of the measured signal amplitudes and determination the permittivity of high-loss materials.