A new structure using increased-width waveguide to realize E-plane filters
was proposed and it has been able to reach wide bandwidth. The bandwidth of
4GHz can be realized at the low frequency end in the Ka band and this can
satisfy the requirements of full-band multi-channel frequency branching. Th
e design theory was presented, and computer simulation and experimental res
ults were given to show the feasibility of the new structure and the validi
ty of the analysis and design method.