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Free-space measurement of complex permittivity and complex permeability of magnetic materials at microwave frequencies

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3 Author(s)
D. K. Ghodgaonkar ; Pennsylvania State Univ., University Park, PA, USA ; V. V. Varadan ; V. K. Varadan

A free-space measurement system operating in the 8.2-40-GHz frequency range is used to measure the reflection and transmission coefficients, S11 and S21, of planar samples. The complex electric permittivity and the magnetic permeability are calculated from the measured values of S11 and S21. The measurement system consists of transmit and receive horn lens antennas, a network analyzer, mode transitions, and a computer. Diffraction effects at the edges of the sample are minimized by using spot-focusing lens antennas. Errors due to multiple reflections between antennas via the surface of the sample are corrected by using a free-space TRL (thru, reflect, line) calibration technique. For thin, flexible samples, the sample had to be sandwiched between two half-wavelength (at mid-band) quartz plates to eliminate sagging. Results are reported in the frequency range of 8.6-13.4 GHz for materials such as Teflon, sodium borosilicate glass, and microwave-absorbing materials

Published in:

IEEE Transactions on Instrumentation and Measurement  (Volume:39 ,  Issue: 2 )