Resonant characteristics of parallel plate waveguide cavities with irises

This paper shows the analysis of electromagnetic scattering by parallel plate waveguide cavities. The internal region is separated into two areas by additional plates, which arises internal coupling problems. The applied numerical technique here is the point matching method considering the edge condition. As a numerical example, the radar cross section is presented for the E-polarized case and the H-polarized case. The authors clarify the internal contribution in terms of the cavity resonances.