Substrate integrated waveguide dual‐band filter with wide‐stopband performance

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.