A novel bandpass filter based on substrate integrated waveguide

Substrate integrated waveguides (SIWs) have been preferred over conventional micro-strip and coplanar transmission lines owing to their minimal conductor losses especially at millimeter-wave frequencies. These have been extensively used in different active and passive circuits (M. Bozzi, A. Georgiadis, IET, 5, 909–920, 2011). Different configurations of SIW-based filters have also been presented, including LTCC-based multilayered structures, and half-mode and ridged SIW filters. These typical SIW designs can suffer from size constraints or require complex fabrication procedures.