This article presents the design, simulation, fabrication, and experimental validation of a three‐port S‐band waveguide circulator with nonstandard dimensions, implemented using commercially available aluminum tubes with internal dimensions close to WR‐284. The device incorporates two Y‐Gd ferrite disks polarized by permanent magnets and coaxial‐to‐waveguide probe‐type transitions with rear short‐circuit tuning. The transitions achieve |S11 | <−10 dB between 2.6 and 3.95 GHz, whereas the complete circulator assembly provides, at 3.1 GHz, |S11 | <−20 dB, an insertion loss of less than 1.8 dB, and an isolation between 17 and 30 dB. Continuous wave measurements at 10 W confirm stable operation at average power. The proposed approach demonstrates that nonstandard, low‐cost waveguide structures can achieve performance comparable with conventional WR‐284 circulators, offering a compact and cost‐effective alternative for S‐band RF systems.
León et al. (Thu,) studied this question.