Design of new wideband waveguide Magic‐T for X‐band applications

Abstract

AbstractThe design and fabrication of low loss and wideband Magic‐T with 10 dB return loss (RL) bandwidth over 40% is proposed for X‐band application, which can be used in monopulse comparator network. The proposed Magic‐T is composed of WR90 waveguides include an exponentially conducting cone, metallic multistep l‐shaped septum, and some other conducting posts. By implementation of these optimized conducting cone, septum, and posts, the 20 dB RL bandwidth over 36% is achieved with very low insertion loss (IL) (<0.15 dB) at each port. Moreover, high isolation (>40 dB) across all port over X‐band is another feature of the proposed Magic‐T. The equal power division (in amplitude and phase) at H‐arm and phase cancellation of input power at E‐arm introduce the proposed Magic‐T as a good candidate for sum/difference comparator network for monopulse application. Validation of the simulation results by experimental ones proves the wideband RL, low IL, and high isolation coefficient of the proposed high‐power Magic‐T as well.