H-Band SPDT Waveguide Switch Based on Glide-Symmetric Electromagnetic Bandgap Structures

This work presents the design and analysis of a single-pole double-throw (SPDT) waveguide switch implemented using multilayer waveguide (MLW) technology. The proposed fully metallic air-filled structure operates in the H-band (220-330 GHz) and employs a glide-symmetric unit cell acting as an electromagnetic bandgap (EBG) material to suppress leakage and improve manufacturing tolerance. The SPDT enables signal routing between two output branches through a rotating metallic part. The design achieves insertion losses below 2 dB and return losses better than 10 dB across most of the H-band.