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http://dx.doi.org/10.5515/KJKIEES.2010.21.12.1447

Compact Dual-Band Bandpass Filter Using Two Dual-Mode Resonators  

Kim, Kyoung-Keun (Department of Electronics and Computer Engineering, Chonnam National University)
Lee, Ja-Hyeon (Department of Electronics and Computer Engineering, Chonnam National University)
Lim, Yeong-Seog (Department of Electronics and Computer Engineering, Chonnam National University)
Publication Information
The Journal of Korean Institute of Electromagnetic Engineering and Science / v.21, no.12, 2010 , pp. 1447-1453 More about this Journal
Abstract
In this paper, the design and the fabrication of dual-band bandpass filter using two dual-mode resonators is presented. Dual-mode resonator using a short stub is miniaturized by inter-digital capacitor and stepped impedance. Two dual mode resonators are designed to have different resonant frequencies, one for the lower passband and the other for the upper passband. Transmission zero is positioned at low or high rejection bands with a sharp skirt characteristic. Dual-band operation can be achieved using dual feeding structure. For WLAN, the proposed filter at 2.45/5.25 GHz is designed and fabricated. The size of the filter is as compact as 1$10.83\;mm{\times}5.3\;mm$.
Keywords
Dual-Band; Dual-Mode; Source/Load Coupling; Coupling Matrix; Bandpass Filter; Dual Feeding; WLAN;
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