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《Acta Electronica Sinica》 2012-01
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Study on the Microstrip DBR Diplexer Based on DGS

CHEN Chun-hong,LI Na,WU Wen(Ministerial Key Laboratory of JGMT,Nanjing University of Science and Technology,Nanjing,Jiangsu 210094,China)  
This paper presents a high isolation microstrip diplexer.The lowpass filter based on defected ground structure(DGS) is introduced into the dual behavior resonator(DBR) microstrip bandpass filter.The slow-wave characteristic of DGS can balance the phase-velocity difference between even-mode and odd-mode of DBR filter,so the rejection in the up stop band of filter can be improved.The DBR filer based on DGS has been analyzed.On this basis,a C-band microstrip diplexer has been developped,and the simulation and experimental result indicate that the insertion loss is less than 1.3dB and the isolation is better than 65dB.
【CateGory Index】: TN713;TN631.2
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