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SUMMARY The formulation of the wall admittance of a circular microstrip antenna by the spectral domain method is presented. The circular microstrip antenna is calculated using the cavity model. The electromagnetic fields within the antenna cavity are determined from the impedance boundary condition at the side aperture. The contribution from the region… (More)

SUMMARY The wall admittance of an arbitrarily shaped microstrip antenna is generally formulated. As examples, elliptical microstrip antennas with and without a circular slot are calculated. The wall admittance is determined by the spectral domain analysis in order to consider the effect of the dielectric substrate. The electromagnetic fields within the… (More)

1. Introduction The authors have analyzed the resistance-loaded planar monopole antenna located within a rectangular parallelepiped cavity for impulse radar and shown the broadband operation of input impedance for the frequencies from 0.5 GHz to 4.5 GHz [1][2]. This antenna is fed by a coaxial probe from the wall of the rectangular cavity of 48 mm by 44 mm… (More)

SUMMARY The electric currents on the upper, lower and side surfaces of the patch conductor in a circular microstrip antenna are calculated by using the integral equation method and the characteristic between the electric currents on the upper and lower surfaces is compared. The integral equation is derived from the boundary condition that the tangential… (More)

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