Substrate integrated image guide (SIIG) - a low-loss waveguide for millimetre-wave applications

A novel synthesized version of the well-known rectangular dielectric image guide is presented in this work for low-cost millimetre-wave applications. Lower effective permittivity regions surrounding a guiding channel were artificially created by using a laser to cut a triangular hole lattice in low-loss high permittivity substrates. Simulation and measurement results for straight sections of such a substrate integrated image guide (SIIG) in TMM substrate and high resistivity silicon are presented. Specific properties of the structure with respect to electromagnetic band gaps (EBG), radiation and leakage, design flexibility, fabrication, and integration in the context of substrate integrated circuits (SIC) are discussed for the first time.