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Progress In Electromagnetics Research Letters
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COMPACT MULTIBAND TRANSVERSAL BANDPASS FILTERS WITH MULTIPLE TRANSMISSION ZEROES

By X. Zhan, Z.-X. Tang, H. Liu, Y. Wu, and B. Zhang

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Abstract:
Novel compact multiband microstrip transversal bandpass filters (BPF) using short-circuited or open-circuited stub-loaded half-wavelength resonators (SLR) are presented. The dual-band BPF consists of two SLRs and two T-shaped feedlines, and the tri-band BPF can be implemented by a simple reconfiguration of adding one resonator above the original circuit of the dual-band BPF. Multiple transmission zeroes are created to improve the selectivity of the filters. Furthermore, the high degree of design freedom is obtained for every passband of dual- or triple-band BPF is achieved by independent resonators and independent signal paths. To verify the proposed concept, two dual-band bandpass filters (filter I and II) and one tri-band bandpass filter (filter III) are designed and fabricated. Both theoretical and measured results are presented, with good agreements.

Citation:
X. Zhan, Z.-X. Tang, H. Liu, Y. Wu, and B. Zhang, "Compact Multiband Transversal Bandpass Filters with Multiple Transmission Zeroes," Progress In Electromagnetics Research Letters, Vol. 34, 157-167, 2012.
doi:10.2528/PIERL12080501

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