Quasi-optical multiplexing using leaky-wave near-field focusing techniques in substrate integrated waveguide technology

This work describes a quasi-optical multiplexing technique in substrate integrated waveguide (SIW) technology. It is based on the frequency dispersion response (spectral-spatial decomposition) of the fundamental SIW leaky mode, which emanates from the SIW and radiates inside the host dielectric substrate. Full-wave simulations in the 10GHz-20 GHz band demonstrate that the rejection between channels can be increased and the insertion losses reduced by using near-field focusing techniques.