SIW magic tee fed by printed Ridge Gap Waveguide design

Abstract

Magic Tee is a four port passive device presented more than 50 years ago. It is deployed in many applications such as duplexers and antenna feeding structures. This type of devices is developed and implemented through different guiding structures. Two major modern guiding structures are the Substrate integrated waveguide (SIW) and the Ridge Gap Waveguide (RGW). This paper introduces a compact magic Tee design implemented by a mixed technology of SIW and RGW. The traditional magic tee contains three ports in one plane, while the fourth port exists in another plane. This results in a large size of the complete structure. This work proposes mixing two different guiding structures in one design in order to overcome this problem. The final results of the magic Tee with the RGW transition shows a good matching and isolation levels for the required bandwidth.