A low cost W-band multilayer SIW filter

Using commercially available printed-circuit-board (PCB) technology, a compact W-band substrate integrated waveguide (SIW) filter is developed with multilayer topology in this letter. Full-wave simulations based on coupling matrix theory have been used to synthesize and optimize the proposed filter. A coupling aperture interface structure is developed for experiments. As demonstrations, the proposed multilayer SIW filter is fabricated on a 1.016 mm thick RO5880 substrate with a compact footprint as small as 3.7 mm by 13mm, and measured by vector network analyser (VNA). Good agreement is obtained between simulated and measured results. This work demonstrates that high performance W-band multilayer SIW filters can be massively realized by using low cost PCB process.