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A Novel Dual-Mode Bandpass Filter Based on a Defected Waveguide Resonator
Xuehui Guan,Wei Fu,Haiwen Liu,안달,임종식 한국전자통신연구원 2011 ETRI Journal Vol.33 No.6
A novel dual-mode bandpass filter (BPF) using a dual spiral-shaped defected ground waveguide (DGW) resonator is proposed in this letter. The dual-mode characteristic of this filter is achieved by loading a defected T-shaped stub at the midline of the spiral-shaped DGW resonator. Also, non-orthogonal input and output feed-lines are adopted in the filter. Based on the compact DGW structure, a dual-mode BPF with central frequency of 1.5 GHz for the global positioning system is designed, fabricated, and measured. Measured results agree well with the predicted response and verify the proposed methodology.
Compact Dual-Wideband Bandpass Filter with Multimode Resonator
Haiwen Liu,Shen Li,Xuehui Guan,Baoping Ren,Jiuhuai Lei,yanwang 한국전자통신연구원 2014 ETRI Journal Vol.36 No.1
A microstrip dual-wideband bandpass filter using amultimode resonator (MMR) is proposed in this letter. Theproposed MMR loaded with a T-shaped open-ended stub and ashort-ended stub exhibits triple mode characteristics, and asynthesis method is developed to illustrate the wide passbandwith independently controllable center frequencies andbandwidths. To verify this design methodology, a dualwidebandfilter with fractional bandwidths of 19.1% and27.9% is designed and fabricated. The measured results agreewith the simulations.
Quad-Band Bandpass Filter Using Quad-Mode Stub-loaded Resonators
Haiwen Liu,Xiaomei Wang,YAN WANG,Shen Li,Yulong Zhao,Xuehui Guan 한국전자통신연구원 2014 ETRI Journal Vol.36 No.4
Compact multi-band bandpass filters using quad-mode stubloadedresonators are proposed in this letter. Firstly, a novelapproach about the mode-splitting characteristics of thequadruple-mode resonator is investigated, which can providedual-band behavior. Secondly, a quad-band filter is proposedand designed by cascading two quadruple-mode resonators;the upper one operates at 1.8/2.4 GHz (GSM- and WiMaxband)and the lower one at 1.57/2.1 GHz (GPS- and WCDMAband). Finally, the proposed filters have been fabricated. Respectable agreement between simulation and measurementverifies the validity of this design methodology.