A superconducting antenna array with a proximity coupled feed network operating at 20 GHz has been developed. The antenna is a 4 X 4 array and its performance was measured from 18 GHz to 22 GHz. At temperatures below 80 K, there was a 15 dBi gain measured at several frequencies in this range. The design of a low loss superconducting phase shifter monolithically incorporated into the YBCO feed network is indicated.
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