Compact multi-layer Band-Pass filter in Substrate Integrated Waveguide (SIW) technology

In this paper, a new miniaturized wide Band-Pass Substrate Integrated Waveguide (SIW) filter is proposed. The miniaturized design is based on two techniques, combining the Slow-Wave and Half-Mode SIW principles. Also different substrates for each layer with high contrast in the effective permittivity are used. This technique shows that the SIW filter is 90% miniaturized with a bandwidth covering the X-band, insertion loss are less than 2dB and return loss under -12.5dB. Results are compared with previous published papers and show a good efficiency when miniaturizing.