A degree‐two WR90 waveguide circulator using radial dielectric waveguide transformers

Most commercial degree‐two waveguide circulators using gyromagnetic turnstile and post resonators are quarter‐wave coupled by metal transformers. The purpose of this short paper is to experimentally describe one post‐resonator geometry using a self‐jigging, partially dielectric‐loaded radial waveguide transformer. The assembly developed in this work has a return loss of 20 dB and an insertion loss of 0.20 dB over a bandwidth of approximately 12% in the WR90 waveguide.