Abstract
AbstractA shallow cavity‐backed slot antenna has been used as a flushmounted antenna in a high‐speed moving object since it is resistant to vibration and shock. This paper presents a theoretical analysis for a circularly polarized antenna consisting of a crossed‐slot along the diagonal line on the surface of a rectangular shallow cavity. As a method of analysis, the reaction matching method has been used which was developed by Richmond as a form of the moment method by Harrington. By means of this method, the input impedance can be obtained over a broad frequency range in the case where an offset feed and a multiple feed are used. In this paper, an offset symmetric two‐point feed is used so that the impedance matching can be realized easily. The input characteristics and the radiation characteristics of the antenna element are obtained numerically and the obtained results are discussed.
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