Vol. 19

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2010-12-20

High Selectivity Broadband Bandpass Filter with Dual-Mode Folded-T-Type Resonator

By Hong-Wei Deng, Yong-Jiu Zhao, Xue-Shun Zhang, Wen Chen, and Wei Liu
Progress In Electromagnetics Research Letters, Vol. 19, 163-169, 2010
doi:10.2528/PIERL10111701

Abstract

In this letter, a compact and high selectivity broadband bandpass filter (BPF) is proposed using the dual-mode folded-T-type resonator and the short stub loaded parallel-coupling feed structure. The resonator can generate one even-mode and one odd-mode in the desired band. Two resonant frequencies can be adjusted easily to satisfy the bandwidth of the BPF. A parallel-coupling feed structure with a cross coupling has been applied to generate two transmission zeros in the lower and upper stopband. Furthermore, the loaded short stub can create two transmission zeros near the upper cut-off frequency and in the upper stopband. Simultaneity, the transmission zero in the lower stopband moves towards the cut-off frequency. One filter prototype with the fractional bandwidth 57% is fabricated for experimental verification of the predicted results. The size for the resonator is only 0.156λg×0.303λg in which λg is the guided wavelength of 50 Ω microstrip at the center frequency.

Citation


Hong-Wei Deng, Yong-Jiu Zhao, Xue-Shun Zhang, Wen Chen, and Wei Liu, "High Selectivity Broadband Bandpass Filter with Dual-Mode Folded-T-Type Resonator," Progress In Electromagnetics Research Letters, Vol. 19, 163-169, 2010.
doi:10.2528/PIERL10111701
http://jpier.org/PIERL/pier.php?paper=10111701

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