Design of an H-Band Rectangular TE30 Mode Power Coupling Structure for High-Order Overmoded Multiple Sheet Electron Beam Devices

In this paper, an H-band (220–325 GHz) rectangular TE30 mode power coupling structure for high-order overmoded multiple sheet electron beam devices is designed. The structure mainly consists of a rectangular
$\text{TE}_{30}$
mode converter and an overmoded Y-shaped coupler with a Bragg reflector. A processing model for a power coupling structure joined back-to-back is designed for future manufacturing and measuring. Simulation results show that the port reflection
$S_{1(1)}$
, 1(1) is lower than the -15 dB over the bandwidth of 48.2 GHz (242.1-290.3 GHz), and the transmission
$S_{2(3),\ 1(1)}$
is higher than - 1 dB over the bandwidth of 38.6 GHz (241.7-280.3 GHz).