带有直流偏置的毫米波单刀双掷开关仿真与设计

Simulation and Design of Millimeter Wave SPDT Switch with DC Bias

采用阶跃阻抗传输线和扇形微带短截线,实现了单刀双掷开关的直流偏置,使直流支路与毫米波支路之间的隔离度大于30dB,带宽超过25%,在中心频率30GHz附近回波损耗大于40dB。采用这种直流偏置电路和PIN梁式引线二极管,基于LTCC工艺对单刀双掷开关串联结构进行仿真。设计结果表明在28.5～31.5GHz频率范围内,串联开关的插入损耗小于1.5dB,回波损耗大于15dB,隔离度大于20dB。

The stepped impedance transmission lines and microstrip radial stubs are used to realize the DC bias of SPDT,thus the isolation more than 30dB between DC branch and millimeter wave branch can be achieved,the bandwidth can be more than 25% and the return loss can be more than 40dB near the center frequency of 30GHz.The proposed DC bias circuit and planar beam lead PIN diodes of series SPDT switch in terms of low temperature co-fired ceramic（LTCC） technology was designed and measured.The results show that from 28.5 to 31.5GHz the insertion loss of series switch is less than 1.5dB,the return loss is more than 15dB,the isolation is more than 20dB.