A Compact Transition Structure Integrated with DC Feed Filter for Submillimeter Wave Application

A compact transition structure integrated with DC feed low pass filter for submillimeter wave application is designed and simulated. In this structure, the probe transition for suspended microstrip is in longitudinal orientation relative to the waveguide, and a sector suspended microstrip low pass filter is integrated for DC feed circuits. Broad bandwidth with low insert loss (<0.1dB) and high return loss (<-20dB) is achieved by using the commercial simulation software HFSS.