Design of dual-passband microstrip bandpass filters with multi-spurious suppression

Meshon Jiang*, Li Ming Chang, Albert Chin

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

39 Scopus citations


A systematic design method for microstrip bandpass filters with both dual-passband response and multi-spurious suppression is proposed in this letter. The filter is composed of stepped impedance resonators (SIRs). A novel asymmetric SIR structure is proposed to effectively increase the degree of freedom in the dual-passband bandwidth design. As a consequence, the transmission zero of the coupling stage could be used to suppress the unwanted higher order spurious responses. A complete design procedure considering both the synthesis of passband responses and the suppression of spurious responses is also depicted in detail. A fifth order filter is designed and fabricated to demonstrate this idea. The measured results show that the upper stopband can have an attenuation level near 30 dB up to more than 20 GHz (8.16 f 0).

Original languageEnglish
Article number5422911
Pages (from-to)199-201
Number of pages3
JournalIEEE Microwave and Wireless Components Letters
Issue number4
StatePublished - 1 Apr 2010


  • Dual-passband filter
  • Microstrip
  • Spurious response
  • Stepped impedance resonator (SIR)

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