As a small antenna for mobile communication, a circular patch antenna miniaturized with a shorting post is proposed. These shorting posts are placed near the feed post. The circular patch antenna miniaturized by offset feed is excited by a hybrid of the coaxial TM01 mode and the TM11 mode. Hence, the antenna has directivities in several polarization planes so that a low gain pattern not realizable with an antenna with a monopole mode is attained. The theoretical analysis of the antenna is carried out by a cavity model in which an impedance boundary is assumed at the edge of the element. Since the conventional procedure cannot be applied to the coaxial TM01 mode that is the fundamental mode of the antenna, an approximate formulation based on the equivalent circuit containing the feed post and the shorting post as the current sources is proposed. It is confirmed that the numerical results of the input impedance and the experimental results agree well. From the numerical analysis, the modal amplitude characteristics of the magnetic current contributing the radiation and the resonant frequency characteristics of the antenna are discussed from the relationship to the feed method.
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Kuga et al. (1996) studied this question.
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