| A full-wave spectral-domain analysis is applied to characterize microstrip antennas and circuit discontinuities. This method adopts the spectral-domain Green's function, which takes all the physical effects into account. The E-field integral equation formulation is used and the method of moments is employed to obtain the current distribution on the microstrip structure. The methodology developed in this dissertation applies to multi-port microstrip circuits, but it is limited to four port junctions when highly accurate results are required. The scattering parameters and the radiation properties are characterized by those numerically calculated current distribution on the metalization area. Direct fed microstrip patch antennas and T-junction microstrip circuit discontinuities have been studied by this method and compared with measurements. Other types of microstrip configurations, such as right-angle cross, square Archimedean spiral, and log-periodic patch, have also been analyzed. |
