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Calibrated Free-Space Microwave Measurements With an Ultrawideband Reflectometer-Antenna System

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4 Author(s)
Zhao, M. ; Dept. of Electr. & Comput. Eng., Wisconsin Univ., Madison, WI ; Shea, J.D. ; Hagness, S.C. ; Van Der Weide, D.W.

We present a 3-12 GHz compact mixer-based reflectometer (CMR) and horn antenna system, and demonstrate its use in detecting backscatter signals with a free space calibration procedure. We evaluate the frequency-domain performance of the CMR-antenna system for measuring the complex reflection coefficient of a dielectric slab and compare it with that of a commercial vector network analyzer (VNA)-antenna setup. Time-domain responses are also investigated, and show the effectiveness of this calibration method. This low-cost, compact system eliminates the need for traditional mechanical standards and a VNA, is effective in reducing reflection artifacts, and allows for flexibility in the placement of reference planes; thus it is well suited for array-based imaging applications

Published in:

Microwave and Wireless Components Letters, IEEE  (Volume:16 ,  Issue: 12 )

Date of Publication:

Dec. 2006

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