COMPACT THIRD-ORDER MICROSTRIP BANDPASS FILTER USING HYBRID RESONATORS

Fei Xiao, Martin Norgren, Sailing He
2011 Progress In Electromagnetics Research C  
In this paper, a novel microwave bandpass filter structure is proposed. By introducing a metallic via hole, the filter structure operates as one λ/2 and two λ/4 uniform impedance resonators and consequently form a triplet coupling scheme. The equivalent circuit model is analyzed in detail, which shows that there is a transmission zero in the low stopband. Based on that concept, three microstrip filters are designed, fabricated and measured, respectively. The first filter has no source/load
more » ... ing and only one transmission zero is created. By introducing source/load coupling, the second filter can create three transmission zeros. The third filter can create a controllable transmission zero in upper stopband. The simulated and measured results agree very well.
doi:10.2528/pierc10092706 fatcat:oqt4brlbg5dkdglkarkimnag5m