Two novel compact substrate integrated waveguide (SIW) band-pass filters are presented in this work. They operate in dual mode at 5.8 GHz with high selectivity of a relative bandwidth of 2% and 5%, respectively. The filter has the dimension of λg × 0.6 λg, which is about 60% of a conventional SIW dual-mode band-pass filter. Simulation and measurements agree well. The empirical design formulae are presented as well.
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Hu et al. (2010) studied this question.
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