A high-temperature superconductor (HTS) microstrip antenna array with right-hand circular polarization is proposed for space\ncommunications. The proposed HTS antenna array can achieve high efficiency, which is able to reduce the antenna�s loss. The array\nconsists of 16 antenna elements being fed by a T-network. A pair of symmetric meander slots is used in each antenna element\nto broaden the input matching bandwidth. A controllable cryostat is used as the refrigeration for HTS. The experiment shows\nthat the gain of the proposed HTS antenna is 8.39 dB, whose 10 dB return loss bandwidth is 2.2% ranging from 5.75GHz to\n5.87GHz. In comparison with a traditional conductor antenna array having the same configuration, the proposed array has an\n8.1 dB improvement in the gain and a 69.2% enhancement in the radiation efficiency.
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