118 GHz single pole double throw switches using filter synthesis method
Received:April 05, 2017  Revised:June 07, 2017  download
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Author NameAffiliationE-mail
YAO Chang-Fei School of Electronic and Information Engineering,Nanjing University of Information Science and Technology yaocf1982@163.com 
CHEN Zhen-Hua School of Electronic and Information Engineering,Nanjing University of Information Science and Technology,Nanjing Jiangsu  
GE Jun-Xiang School of Electronic and Information Engineering,Nanjing University of Information Science and Technology,Nanjing Jiangsu  
ZHOU Ming Department of Microwave and Millimeter Wave Modules,Nanjing Electronic Devices Institute Nanjing  
WEI Xiang Department of Microwave and Millimeter Wave Modules,Nanjing Electronic Devices Institute Nanjing  
Abstract:118 GHz single pole double throw (SPDT) switches were designed and tested for radiometers in satellite applications. Filter synthesis method was proposed for the switches analysis. Based on equivalent circuit of the discrete AlGaAs/GaAs heterojunction PIN diodes, lumped element filter model of the switches was synthesized and its equivalent distributed circuit was developed. The size of the developed 118 GHz quasi-MMIC SPDT switch circuit is 6×2.5×0.1 mm3. For the packaged SPDT switch module, insertion loss (IL) introduced by mounting deviation of the waveguide microstrip transitions and the bonded ribbons is discussed. In the frequency range 110~120 GHz, the IL of the switch modules is less than 3.0 dB and typical value is 2.6 dB, and their isolation is higher than 22 dB. Response time, switch on time, switch off time and recovery time of the switches are lower than 18 ns, 20 ns, 10 ns and 18 ns, respectively. The 118 GHz switches can be widely used in transceiver systems.
keywords:SPDT switch, PIN diode, Insertion loss, Isolation
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Copyright:《Journal of Infrared And Millimeter Waves》