Calibrated Free-Space Microwave Measurements With an Ultrawideband Reflectometer-Antenna System |
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Authors: | Zhao M Shea J D Hagness S C van der Weide D W |
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Affiliation: | Dept. of Electr. & Comput. Eng., Wisconsin Univ., Madison, WI; |
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Abstract: | 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 |
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