A tunable single-to-balanced bandpass filter with bandwidth control

Xu Zhu, Tao Yang, Pei-Ling Chi, Ruimin Xu

Research output: Contribution to conferencePaperpeer-review

1 Scopus citations


In this paper, a novel tunable single-to-balanced bandpass filter is proposed. It consists of three stepped-impedance resonators (SIRs), which are loaded and connected by varactors in between. With the very simple structure, the proposed reconfigurable filter can not only achieve center frequency control, but independent bandwidth tuning in the whole tuning state. The filter can cover from 1-1.3GHz, with 1-dB bandwidth tuning from 40-110MHz. The in-band amplitude and phase imbalances between each differential outputs crossing the entire tuning range are less than 0.3dB and 1 degree, respectively. Good agreement is obtained between the simulated and experimental results.

Original languageEnglish
Number of pages3
StatePublished - 1 Jan 2019
Event30th Asia-Pacific Microwave Conference, APMC 2018 - Kyoto, Japan
Duration: 6 Nov 20189 Nov 2018


Conference30th Asia-Pacific Microwave Conference, APMC 2018


  • Bandwidth control
  • Differential outputs
  • SIRs
  • Single-to balanced bandpass filter

Fingerprint Dive into the research topics of 'A tunable single-to-balanced bandpass filter with bandwidth control'. Together they form a unique fingerprint.

Cite this