Magic Tee Using Gap Waveguide Technology

This paper presents a gap waveguide technology-based planar magic tee component designed at W band. The proposed four-port magic tee is implemented using two different guiding structures such as ridge gap waveguide (RGW) and groove gap waveguide (GGW) transmission lines. First, the two gap waveguide transmission lines are realized at W band. Later, the performance of each structure is characterized with respect to reflection coefficient characteristics. Secondly, the H plane of the magic tee is realized using RGW structure and the E arm of magic tee is realized using GGW structure. The simulation results show reflection coefficient characteristics better than -10dB over the entire W band. In addition, the magic tee has isolation better than 30 dB between the orthogonal ports and between the collinear arms. It also achieves good amplitude and phase imbalance over the entire operating bandwidth. The proposed magic tee serves as a promising candidate in developing a comparator circuit which is a key requirement in millimeter wave monopulse tracking radar.