MICROSTRIPLINE-FED AND STRIPLINE-FED APERTURE-COUPLED CYLINDRICAL RECTANGULAR MICROSTRIP ANTENNAS

Stripline-fed and microstripline-fed aperture-coupled cylindrical rect angular microstrip antennas are investigated. The equivalence principl e is invoked to separate the feedline and the antenna patch with equiv alent magnetic currents distribution on the aperture region. The Loren tz reciprocity theorem is applied to find the interactions between the aperture and the feedline. The unknown patch current and aperture fie ld are determined by solving coupled integral equations, which involve spectral-domain Green's functions, using Galerkin procedure. Numerica l results of input-impedance and far-field patterns are compared with those for antennas on a planar surface.