A Novel Method of Optimization SIW Bandpass Filter Using Coupling Matrix

Abstract

In this paper, a novel three-pole substrate integrated waveguide (SIW) bandpass filter (BPF) using the coupling Matrix is proposed, commercially available printed circuit board (PCB) technology. The detailed design procedure beginning from the normalized Chebyshev lowpass filter, to the final optimized SIW bandpass filter is presented. The test filter having a 4.01% fractional bandwidth centered at 1.76 GHz was simulated on a 1.27 mm thick, Rogers RT/Duroid 6010LM substrate with a 10.2 dielectric constant. The design has also been validated and results presented. The simulation response of the SIW bandpass filter show good agreement with a low insertion loss of 1.3 dB. The simulated return losses of about 15 dB were achieved across the filter passband.