Holey and pinned structures comparison for waveguide phase shifters

This paper presents the applicability of using structures to control the phase shift in a waveguide phase shifter. By means of dispersion diagrams, different phase shift unit cells are analyzed. Glide symmetry is also applied to some of these unit cells to evaluate its effects in the propagating modes. Then, unit cells with best dispersive behaviour are selected to design two waveguide phase shifters, one by pinned unit cells and the other by holey pinned unit cells. Both waveguide phase shifters are well matched in the frequency range from 50-75 GHz with insertion losses lower than 0.5 dB. The phase shift produced by both waveguide phase shifter is also evaluated. Pinned waveguide phase shifter is more dispersive compared to the holey waveguide phase shifter, producing a phase shift deviation over 180° of ±50° and ±10°, respectively.