Novel Microstrip Coupled-Line Bandpass Filters With Shortened Coupled Sections for Stopband Extension
Resource
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, VOL. 54, NO. 2, FEBRUARY 2006
Journal
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
Journal Volume
VOL. 54
Journal Issue
NO. 2
Pages
-
Date Issued
2006-02
Date
2006-02
Author(s)
Wu, Chao-Huang
Lin, Yo-Shen
Wang, Chi-Hsueh
Chen, Chun-Hsiung
DOI
246246/200611150121350
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 (2 +1) ( = 1 2 . . .),
where is the passband center frequency. The proposed filters
feature compact size and low insertion loss, and have two crosscoupled-
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 6 is implemented and carefully
examined. To further improve the filter response, the fourth-order
filter with the rejection extended up to 7 4 and better than
30 dB is also implemented.
Subjects
Bandpass filter
coupled line
microstrip
stopband extension
Publisher
Taipei:National Taiwan University Dept Elect Engn
Type
journal article
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