Compact microstrip bandstop filter using open stub and spurline

Wen Hua Tu, Kai Chang

Research output: Contribution to journalArticlepeer-review

190 Scopus citations


A compact wideband high-rejection microstrip bandstop filter (BSF) is presented. This filter combines two traditional BSFs: open-stub filter and spurline filter. Due to the inherently compact characteristics of the spurline, the proposed filter shows a better rejection performance than open-stub BSF without increasing the circuit size. From 3.7 to 5.4 GHz, the proposed BSF has a rejection of better than 20 dB and the maximum rejection level of 61 dB. Application of this BSF to suppress the second harmonic of an open-loop ring bandpass filter is also investigated with a 40-dB suppression improvement achieved.

Original languageEnglish
Pages (from-to)268-270
Number of pages3
JournalIEEE Microwave and Wireless Components Letters
Issue number4
StatePublished - Apr 2005


  • Bandstop filter (BSF)
  • Harmonic suppression
  • Spurline


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