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A compact tunable bandpass filter with tunable transmission zeros in the pass band adopting a nested open ring resonator
Author(s) -
Zhang Zhonghai,
Chen Lin,
Wu Aiting,
Fang Zhihua,
Guan BoRan
Publication year - 2018
Publication title -
international journal of rf and microwave computer‐aided engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.335
H-Index - 39
eISSN - 1099-047X
pISSN - 1096-4290
DOI - 10.1002/mmce.21417
Subject(s) - passband , band pass filter , resonator , bandwidth (computing) , optical ring resonators , wideband , transmission (telecommunications) , filter (signal processing) , electronic engineering , materials science , optoelectronics , telecommunications , computer science , electrical engineering , engineering
In order to suppress the high level interference signals in the passband of a wideband communication system, a tunable bandpass filter with tunable transmission zeros in the pass band is presented in this letter. The tunable nested open ring resonator is operated to achieve the tunable transmission zeros in the tunable pass band. Adopting the nested open ring resonators, the passband and the transmission zeros can also be designed according to the demand independently. A tunable bandpass filter adopting five nested open ring resonators is designed, fabricated and measured. The tunable filter is tuning in the range of 400‐530 MHz. The 3 dB bandwidth of the tunable filter is in the range of 17‐18 MHz. The simulated results are in good agreement with the measured ones.