A Compact and Broadband Magic Tee with Waveguide Filter for Ka-Band System

Abstract

In this letter, we propose and fabricate a waveguide Magic Tee with waveguide filter for Ka-band system. The proposed Magic Tee has a reduced $z$ -axis arm, which must typically be long for impedance matching at the input port. A bridge iris is inserted at port 4 for signal application. The $z$ -axis arm at port 4 is significantly shortened by the impedance matching tuning through the iris that is normally uses to connect the adaptor. Thus, the dimension of the proposed Magic Tee is reduced to $7.12\times 10\times 3.6\text{m}{\text{m}}^3$ , and the insertion loss shows good performance of 0.9 dB by applying the impedance matching tuning. The proposed Magic Tee also contains a 7th waveguide filter, which is used to verify the signal division performance. The results of excitation at each port of the Magic Tee show insertion loss less than 4.5 dB and return loss of over 18 dB.