Analysis of High Frequency Characteristics of Sheet Beam Rectangular Waveguide Grating Operating in High-Order Mode

For the rectangular waveguide grating slow-wave structure, the dispersion relation was obtained by the eigen-function method. The coupling impedance and the Ohmic loss were derived from the relevant equations. Two theoretical models were studied by comparing their calculation results of the HF characteristics of the rectangular waveguide grating slow wave structure with those obtained by HFSS code and CST-MWS. The HF characteristics of the larger size SWS operating in the high order mode and the SWS operating in the fundamental mode were compared, and the results presented in this paper demonstrate the possibility of using the high-order mode in devices.