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http://dx.doi.org/10.5515/JKIEES.2012.12.3.210

An Enhanced Skirt Characteristics Triple-Mode Filter  

Lee, Ja-Hyeon (Dept. of Electronics and Computer Engineering, Chonnam National University)
Nam, Hun (Ericsson-LG Co., Ltd.)
Lim, Yeong-Seog (Dept. of Electronics and Computer Engineering, Chonnam National University)
Publication Information
Journal of electromagnetic engineering and science / v.12, no.3, 2012 , pp. 210-215 More about this Journal
Abstract
This paper presents a compact microstrip triple-mode filter with enhanced skirt characteristics. The presented triple-mode filter configuration supports three transmission poles and three transmission zeros within the nearby passband. Two of transmission zeros are generated by a triple-mode resonator itself, and the third one is generated by small cross-couplings between the I/O ports. Each resonance condition and the transmission zero generation conditions are analyzed using an equivalent circuit. The bandpass filter is designed for a 2.4 GHz WLAN. The filter was fabricated with a relative dielectic constant of 3.5 and a thickness of 0.76 mm. The fabricated filter has a small size ($7.9mm{\times}7.2mm$, i.e., $0.107{\lambda}_g{\times}0.098{\lambda}_g$, where ${\lambda}_g$ is guided wavelength at a center frequency) and shows high performing skirt characteristics.
Keywords
Resonator Filters; Microstrip Filters; Band Pass Filters; Triple-Mode;
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