A study of wave radiation from quasi-optical resonators. I

A boundary wave method is employed to investigate the diffraction of a waveguide beam with Gaussian distribution on a metal disk. Computed radiation patterns for two orthogonal polarizations are compared with those measured experimentally, demonstrating the directed character of the diffraction field of an open resonator. It is also shown that inclusion of boundary effects into the analysis results in differences in the computed radiation patterns and in the appearance of a nonzero cross-component of the diffused field. Furthermore, the presence of a diffraction resonance field does not lead to any notable deformation of the amplitude distribution of the resonance field.