Millimeter-wave Wideband Half-Mode SIW Phase Shifter based on IDC Slots and Thin Dielectric Slab

This research work proposes a compact, low-profile, wideband half mode substrate integrated waveguide (HMSIW) phase shifter employing interdigital capacitor (IDC) slots and a very thin dielectric slab. The proposed phase shifter design is divided into three sections. An HMSIW with a series of rectangular grooves are etched on the top conducting layer to obtain the initial phase shift. Next, the IDC-based slots are engraved to further improve the phase shift. Lastly, the phase shift is obtained in wideband due to the extra loading of the dielectric slab patterned with rectangular strips that constitutes the final structure. The proposed three versions of the HMSIW phase shifter designs provide a phase shift of 15 degree, 70 degree, and 101 degree, respectively, for the three cases with an overlapping bandwidth of 24.6 GHz to 33.2 GHz corresponding to a fractional bandwidth of 29.7%.