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2022-01-25
Compact Dual-Band Bandpass Filter with High Selectivity Using Stub-Loaded Stepped-Impedance Resonators
By
Progress In Electromagnetics Research Letters, Vol. 102, 101-107, 2022
Abstract
A novel compact dual-band bandpass filter with wide stopband using stub-loaded stepped-impedance resonators is presented in this paper. The characteristics of the dual-mode resonator are investigated by using even/odd mode analysis. The center frequencies and bandwidths of the two passbands can be controlled by adjusting the geometric dimensions of the stub-loaded stepped-impedance resonators. Moreover, the filter has been implemented with five transmission zeros to improve the selectivity. A prototype of a dual-band bandpass filter centered at 3 and 4.35 GHz has been designed and fabricated. The measured bandwidths are 8.3 and 4.6%, and the corresponding insertion losses are 1.7 and 1.6 dB, respectively. A compact dual-band bandpass filter with sharp roll-off rate of 113.3/56.7/56.7/170 dB/GHz, wide stopband of 5.3 GHz, and isolation between two passbands of 25 dB is achieved. The measured results are in good agreement with the simulated ones.
Citation
Zhonghua Zhang Ming Xia Guanglin Li , "Compact Dual-Band Bandpass Filter with High Selectivity Using Stub-Loaded Stepped-Impedance Resonators," Progress In Electromagnetics Research Letters, Vol. 102, 101-107, 2022.
doi:10.2528/PIERL21112501
http://www.jpier.org/PIERL/pier.php?paper=21112501
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