A segmentation method for the analysis of thin cavity antennas

A cavity method that is not restricted to shapes which have separable geometries is described. Metallic surfaces are replaced by perfect electrically conducting walls and radiating sides and apertures are replaced by perfect magnetically conducting walls. The result is a closed cavity. It is also assumed that any prescribed and induced electric currents flow in the z direction, while the prescribed and induced magnetic currents flow in planes transverse to z. This, in effect, states the problem to be transverse magnetic. Input impedance can be calculated by allowing the cavity to radiate and introducing radiation loss and ohmic loss into an effective dielectric constant of the closed cavity. The microstrip patch antenna is considered as a simple example.<>