Design of wideband CPW bandpass filters using phase comparison method and oblique air bridges. Issue 16 (1st November 2020)

• Record Type: Journal Article
• Authors: Jin, Huayan; Chien, Chiao-Yi; Li, Eric S.; Li, Chung-Yi; Chin, Kuo-Sheng
• Is Part Of: Journal of electromagnetic waves and applications. Volume 34:Issue 16(2020)
• Page Start: 2079
• Page End: 2093
• Publication Date: 2020-11-01
• Subjects: Coplanar-waveguide (CPW) filter -- oblique air bridges -- phase comparison method -- stub-type filter -- wideband bandpass filter; Electromagnetic waves -- Periodicals; Electromagnetic devices -- Periodicals; 621.3
• DOI: 10.1080/09205071.2020.1807414
• Languages: English
• ISSNs: 0920-5071

Abstract

ABSTRACT: This work presents two wideband coplanar-waveguide bandpass filters using open-circuited stubs (Design 1) and short-circuited stubs (Design 2), respectively. The electrical lengths of stubs were accurately determined by a phase comparison method. In Design 1, a spurious resonance was found at the high band edge of the passband. The problem was solved by introducing oblique air bridges to ruin the undesired resonance path for the suppression of the spurious resonance. Design 1 achieves bandwidth of 38.1% and low insertion loss of 0.7 dB. Another CPW filter, Design 2, was constructed with short-circuited stubs for compact size, which can achieve a very wide bandwidth of 70.8% and insertion loss of 0.9 dB.