| An Enhanced Skirt Characteristics Triple-Mode Filter |
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Ja-Hyeon Lee1, Hun Nam2, Yeong-Seog Lim1 |
1Dept. of Electronics and Computer Engineering, Chonnam National University
2Ericsson-LG Co., Ltd. |
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| Abstract |
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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. |
| Key words:
Resonator Filters, Microstrip Filters, Band Pass Filters, Triple-Mode |
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