Novel microstrip coupled-line bandpass filters with shortened coupled sections for stopband extension

Chao Huang Wu, Yo Shen Lin, Chi Hsueh Wang, Chun Hsiung Chen

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

Novel microstrip coupled-line bandpass filters with extended rejection band are proposed using the transmission zeros inherently associated with the shortened coupled sections to suppress the odd spurious harmonics at (2n + 1)f o (n = 1, 2, ...), where f o is the passband center frequency. The proposed filters feature compact size and low insertion loss, and have two cross-coupled-induced transmission zeros near the passband edges for improving the filter selectivity. To demonstrate this novel technique of shortening coupled sections, the second-order filter with the stopband extended up to 4.6f o is implemented and carefully examined. To further improve the filter response, the fourth-order filter with the rejection extended up to 7.4f o and better than 30 dB is also implemented.

Original languageEnglish
Pages (from-to)540-546
Number of pages7
JournalIEEE Transactions on Microwave Theory and Techniques
Volume54
Issue number2
DOIs
StatePublished - Feb 2006

Keywords

  • Bandpass filter
  • Coupled line
  • Microstrip
  • Stopband extension

Fingerprint

Dive into the research topics of 'Novel microstrip coupled-line bandpass filters with shortened coupled sections for stopband extension'. Together they form a unique fingerprint.

Cite this