Abstract
The first substrate integrated waveguide dual-band bandpass filter with wide-stopband performance is presented. This filter is synthesised and designed with fourth-order Chebyshev responses and identical fractional bandwidths for the two passbands centred at 12 and 16 GHz. Multiple spurious resonances have been intrinsically suppressed by introducing the harmonics-staggered technique and the centred coupling windows. Good agreements can be observed between the measured and simulated results, and better than 25-dB rejection level up to 2.05 f 1 has been successfully achieved.
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