Diffraction of a symmetric TM mode at an open-ended deeply corrugated waveguide with a small period

We investigate the diffraction of TM mode at an open-ended deeply corrugated cylindrical waveguide. We analyze the case when wavelengths and the waveguide radius are much greater than the corrugation period. In this case, equivalent boundary conditions (EBC) can be used. The approach applied uses the solution of the corresponding Wiener–Hopf–Fock equation. Typical radiation patterns are presented and analyzed.