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This paper reported a broadband 8times16 retro-directive array for millimeter-wave applications. The array element is a proximity-coupled dual-ring antenna with a bandwidth of 33.7% (31-42.8 GHz). The antenna is used to build a 4times4 retrodirective array as a sub-array. Then the sub-arrays are assembled to form an 8times16 array. The design method of the arrays and the measured performances from...
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