Bandpass filter using coupled-line-stub cascaded structure with high stopband rejection

Sen Lu, Kai Da Xu, Yingjiang Guo, Yi Ren, Qiang Chen

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


A compact fifth-order bandpass filter (BPF) with high stopband rejection level is proposed using a coupled-line-stub cascaded structure (CLS-CS). Based on transversal signal-interference technique, the CLS-CS is introduced to improve the characteristics of the filter, generating four new transmission zeros (TZs) close to band edge. The positions of all TZs are calculated through input impedance deduction. For demonstration, a BPF prototype centered at 2.1 GHz is designed with measured 3-dB fractional bandwidth of 39% (1.68-2.50 GHz) and stopband rejection levels of over 28.9 dB, which validates the proposed idea.

Original languageEnglish
Pages (from-to)69-74
Number of pages6
JournalMicrowave and Optical Technology Letters
Issue number1
Publication statusPublished - 2021 Jan


  • bandpass filter
  • coupled line
  • stopband rejection
  • transversal signal-interference technique


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