Vol. 79

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2018-10-07

Dual-Mode BPF with Four Transmission Zeros Using S-L Coupling Structure with Quadratic Function Coupling Coefficient

By Fei Liu, Tao Xu, Liang Sun, Yi-Fan Xue, and Hong-Wei Deng
Progress In Electromagnetics Research Letters, Vol. 79, 39-43, 2018
doi:10.2528/PIERL18072804

Abstract

In this letter, a compact microstrip bandpass filter (BPF) with four transmission zeros (TZs) is designed by using a short-stub centered loaded folded dual-mode resonator and an I/O mutual coupled open-stub loaded feedline structure. The coupling structure can realize source-load (S-L) coupling with quadratic function coupling coefficient, which can generate three TZs in the upper-stopband to improve the selectivity. Owing to the intrinsic characteristics of the dual-mode resonator, one extra TZ can be created near the lower passband edge. Finally, a compact BPF with fractional bandwidth (FBW) of 3.5% located at 2.4 GHz for WLAN application has been designed and fabricated. Good agreement between simulation and measurement verifies the validity of the design.

Citation


Fei Liu, Tao Xu, Liang Sun, Yi-Fan Xue, and Hong-Wei Deng, "Dual-Mode BPF with Four Transmission Zeros Using S-L Coupling Structure with Quadratic Function Coupling Coefficient," Progress In Electromagnetics Research Letters, Vol. 79, 39-43, 2018.
doi:10.2528/PIERL18072804
http://www.jpier.org/PIERL/pier.php?paper=18072804

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