A novel evanescent-mode bandpass filter (BPF) is presented using folded and ridge substrate integrated waveguides (FSIWs & RSIWs). Both measured and simulated S-parameters are presented to show the characteristics, with good agreements achieved between them. It is experimentally validated that such a BPF has better performance in spurious suppression and much smaller size than those of conventional SIW cavity-coupled counterparts.
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Wu et al. (2009) studied this question.
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