We have evaluated a Fermi antenna newly designed in X band for use in a multichannel reflectometer. The Fermi antenna is a tapered slot antenna provided with both a Fermi-Dirac-function-type tapered slot structure and a corrugated structure along the antenna edge in order to improve radiation patterns of the linearly tapered slot antenna. We attained a 3 dB beam width of 32° in the E plane and 37° in the H plane at 12 GHz. By optimizing the stripline dimensions according to an equivalent circuit model, a bandwidth of 8-18 GHz with a voltage standing-wave ratio less than 2 is obtained. In the mockup experiments using a rotating metal cylinder, the experimental results are in good agreement with the predicted ones.
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