Experimental results on a scanned beam microstrip antenna array with a proximity coupled YBCO feed network

The design, fabrication, and measurement of a scanned beam microstrip antenna array with a high-temperature superconducting YBCO feed network are described. A novel geometry is introduced which integrates the antenna array into a window on the vacuum enclosure of the cryocooler for maximum thermal and RF efficiency. The model considered includes surface wave and mutual coupling effects, which are of importance in large array applications. Experimental results demonstrate broadband radiation with expected gain values for broadside and 45-degree scan angles.<
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