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A Quasi-Optical Free-Space Measurement Setup Without Time-Domain Gating for Material Characterization in the W -Band

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3 Author(s)
Daniel Bourreau ; LEST, ENST de Bretagne, Brest ; Alain Peden ; Sandrick Le Maguer

In this paper, a new free-space measurement setup at millimeter waves for material characterization is presented. Using specific Gaussian optics lens antennas and a thru, reflect, and line calibration, the setup provides the free-space four S-parameters over the W-band of planar dielectric slabs without time-domain gating. An efficient optimization procedure is implemented to extract complex permittivity from the four S-parameters of homogeneous dielectric materials. Nonhomogeneous materials can also be tested, and measurements are presented. Very good agreement is observed between simulated and measured four S-parameters of various dielectric plates. Thanks to this new specific calibration and measurement procedure, automation of the test bench is easily achieved

Published in:

IEEE Transactions on Instrumentation and Measurement  (Volume:55 ,  Issue: 6 )