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A compact quad-band bandpass filter with mixed electric and magnetic coupling

Published online by Cambridge University Press:  10 April 2019


Jie Zhou
Affiliation:
College of Electronic Information and Optical Engineering, Nankai University, Tianjin 300350, China
Litian Wang
Affiliation:
College of Electronic Information and Optical Engineering, Nankai University, Tianjin 300350, China
Zhipeng Wang
Affiliation:
College of Electronic Information and Optical Engineering, Nankai University, Tianjin 300350, China
Shengfang Zhang
Affiliation:
College of Electronic Information and Optical Engineering, Nankai University, Tianjin 300350, China
Ming He
Affiliation:
College of Electronic Information and Optical Engineering, Nankai University, Tianjin 300350, China
Corresponding
E-mail address:

Abstract

In this paper, based on a novel multimode stub-loaded resonator, a second-order quad-band bandpass filter (BPF) with mixed electric and magnetic coupling is presented. The electric coupling and magnetic coupling are realized by arranging the parallel coupled lines and the grounded stub, respectively. Eight controllable resonant modes can be simultaneously excited and easily tuned. Eight transmission zeros are created, enhancing the passband selectivity. In addition, the bandwidths can be controlled independently by adjusting the coupling strength. A quad-band BPF centering at 0.67, 1.51, 2.84, 3.58 GHz with respective 3 dB fractional bandwidths of 13.4, 15.6, 9.2, 11.5% is designed, fabricated, and measured. The filter is compact with overall size 0.058λg × 0.13λg. The measured results show a good consistence with the simulated ones.


Type
Research Papers
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2019 

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References

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