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《Journal of Zhejiang University(Engineering Science)》 2017-01
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Design of microstrip bandpass filter with enhanced stopband rejection based on coupled-mode theory

XU Hui;XU Xiu-qin;MO Jiong-jiong;WANG Zhi-yu;SHANG Yong-heng;WANG Li-ping;YU Fa-xin;School of Aeronautics and Astronautics,Zhejiang University;  
A microstrip bandpass filter with enhanced stopband rejection was designed based on the temporal coupled-mode theory in order to realize the signal isolation between transmitter and receiver(TR)channels in radio frequency(RF)transceiver systems.The filter consisted of two microstrip resonators,one supports an odd and an even mode,and the other supported an even mode.These three resonant modes coupled with each other,producing a transmission zero at low frequency below the passband,and two transmission zeros at high frequency above the passband.High frequency selection,passband flatness,and good stopband rejection above the passband were achieved.A C-band triple-mode microstrip bandpass filter was taken as an example.The characteristics of the filter with enhanced high-frequency stopband rejection can be accurately calculated by using temporal coupled-mode theory,and the coupling relationship among the three resonant modes can be obtained.The filter structure which satisfies the coupling relationship can be finished by using electromagnetic eigenmode simulation.The proposed filter was fabricated and tested.The test results matched the theoretical prediction well.Results show that the filter can be effectively applied in the isolation between TR channels in RF transceiver systems.The temporal coupled-mode theory can highly improve the design efficiency of filters with multi-mode coupling,whichcan achieve the required filter response of the system with high speed.
【Fund】: 国家自然科学基金资助项目(61401395);; 中央高校基本科研业务费专项资助项目(2014QNA4033);; 浙江省教育厅资助项目(Y201533913)
【CateGory Index】: TN713.5
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