This article presents a cavity‐model analysis of spherical‐circular microstrip antennas. In this study, expressions for the input impedance and far‐zone radiated fields are derived and given. Numerical results of the input impedance and radiation patterns for the antenna excited at the TM 11 mode are presented, and are compared with those obtained by the generalized transmission line model and the full‐wave approach to discuss the applicability of the cavity‐model theory for the analysis of spherical microstrip antennas.
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Chen et al. (1994) studied this question.