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A cavity‐backed slot antenna array using a single waveguide‐fed subarray is proposed to reduce feed‐line loss, increase radiation efficiency, and make the feed network simple. A subarray consists of 2 × 4 slot elements backed by a single cavity. By proper choice of dimensions, it is shown that the proposed antenna has the characteristics of high radiation efficiency and broad frequency bandwidth. The antenna characteristics for the array antenna with 256 elements are measured in the Ku‐band. A single cavity‐backed subarray has a gain of 18 dBi. The gain of the total antenna array (256 elements) is more than 33 dBi.
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Lee et al. (2004) studied this question.
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