A novel method to design a wideband substrate integrated waveguide (SIW) bandpass filter (BPF) with compact size, wide stopband and high selectivity is presented. In this method some unique electromagnetic band-gap (EBG) cells are periodically etched on the top layer of SIW to realize a wide passband propagating below the equivalent waveguide cutoff frequency. By changing the configuration of EBG cells, undesired harmonics in upper stopband can be suppressed and a wideband BPF with wide stopband can be obtained. By symmetrically loading two complementary split ring resonators (CSRRs) on the tapered gradient lines of the input/output ports, a transmission zero near the passband can be introduced, and it makes the frequency selectivity of upper sideband improve significantly. As a verification, a wideband SIW BPF with a 3.02 GHz absolute bandwidth (ABW) and a 64.7% fractional bandwidth (FBW) centered at 4.67 GHz is designed, simulated, manufactured, and measured. The results of the experiment and simulation are in good agreement.
In this Letter, a compact and high‐performance ultra‐wideband (UWB) bandpass filter based on half‐mode substrate integrated waveguide (HMSIW) is proposed. A novel slow‐wave structure with lowpass characteristics is developed and loaded on the HMSIW to obtain the UWB frequency response and realise size‐reduction. Moreover, two rectangular slots are etched on the transition structures of the microstrip‐to‐HMSIW to obtain a good UWB impedance matching. As a verification, a prototype is designed, simulated, fabricated and measured. Good agreements can be observed between simulated and measured performances.
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