An 18–40 GHz Ridge Waveguide Magic-T Using Stepped Conducting T-Junction Transition

This paper presents a wideband ridge waveguide Magic-T based on an E- and an H-arm waveguide power divider using a stepped conducting T-junction transition. The Magic-T is designed to cover the full band of 18–40 GHz with a relative bandwidth of 76%. This bandwidth cannot be achieved by a Magic-T based on a conventional rectangular waveguide. Thus, the ridge waveguide ports have been employed and an 18–40 GHz ridge waveguide Magic-T has been fabricated and measured. It is demonstrated that the proposed Magic-T achieves better than 0.3 dB insertion loss and 15 dB return loss, less than 0.2 dB magnitude imbalance, and 2.5° phase imbalance. In addition, the measured data show good agreement with the simulation results, and high isolation is also obtained.