A balanced tri-band BPF with high selectivity based on ASSLR

Lei Chen; Min Wang; Tian Tian Zhang; Jia Yi Peng; Feng Wei

doi:10.1515/freq-2022-0071

Article

A balanced tri-band BPF with high selectivity based on ASSLR

Lei Chen , Min Wang , Tian Tian Zhang , Jia Yi Peng and Feng Wei

Published/Copyright: July 20, 2022

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From the journal Frequenz Volume 77 Issue 3-4

Abstract

In this paper, a balanced second-order tri-band bandpass filter (BPF) with high selectivity is proposed. Three differential-mode (DM) passbands are formed by applying one pair of asymmetric short stub-loaded resonators (ASSLRs) and uniform impedance resonators (UIRs) into the design. Meanwhile, the frequencies and bandwidths of the DM passbands can be quasi-independently controlled by the lengths of resonators and the gaps between them. In addition, broadband common-mode (CM) suppression is achieved intrinsically without affecting the DM parts based on the U-type balanced stepped-impedance microstrip-slotline transition (BSIMST) structures, thereby simplifying the design procedure significantly. In order to validate the practicability, a balanced tri-band BPF operating at 1.8, 3.5 and 4.45 GHz is fabricated and designed. A good agreement between the simulated and measured results is observed.

Keywords: balanced bandpass filter; balanced stepped-impedance microstrip-slotline transition (BSIMST); common-mode suppression; differential-mode (DM); tri-band

Corresponding author: Lei Chen, School of Electronic and Information Engineering, Xi’an Technological University, Xi’an 710021, P. R. China, E-mail: sumter1108@163.com

Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
Research funding: None declared.
Conflict of interest statement: The authors declare no conflicts of interest regarding this article.

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Received: 2022-04-05

Accepted: 2022-07-04

Published Online: 2022-07-20

Published in Print: 2023-04-25

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Articles in the same Issue

https://doi.org/10.1515/freq-2022-0071

Keywords for this article

balanced bandpass filter; balanced stepped-impedance microstrip-slotline transition (BSIMST); common-mode suppression; differential-mode (DM); tri-band