A 0.61‐2.39 GHz fully tunable bandpass filter with minimum number of loaded varactors. Issue 2 (23rd November 2018)

• Record Type: Journal Article
• Authors: Lan, Bo‐Zhang; Li, Hai‐Xiong; Guo, Chen‐Jiang; Ding, Jun
• Is Part Of: Microwave and optical technology letters. Volume 61:Issue 2(2019:Feb.)
• Page Start: 469
• Page End: 473
• Publication Date: 2018-11-23
• Subjects: fully tunable -- stepped‐impedance resonator -- ultra‐wide tuning range -- varactor; Microwaves -- Periodicals; Optics -- Periodicals; 621
• DOI: 10.1002/mop.31561
• Languages: English
• ISSNs: 0895-2477

Abstract

Abstract: A 2‐pole fully tunable bandpass filter (BPF) with only two varactors implemented is proposed in this paper. The ultra‐wide center frequency (CF) tuning range is built on short‐ended stepped‐impedance resonators (SIRs). Two varactors are placed at the symmetrical plane of the filter in series and shunt configurations, according to the odd‐even mode analysis the CF and bandwidth (BW) of the passband can be tuned independently without adding any redundant tuning elements. The CF of the proposed filter can be tuned from 0.61 to 2.39 GHz. The 3 dB BW tuning range is 150‐260 MHz at the lower side and 290‐520 MHz at the upper side of the entire passband tuning range. Good agreement is observed between simulated and measured results.