A Polyimide/Alumina-Ceramic Multilayer MIC Analog Phase Shifter with a Large Phase Shift(Special Issue on Microwave and Millimeter-Wave Module Technology)

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This paper demonstrates a polyimide/aluminaceramic multilayer MIC analog phase shifter with a large phase shift. First, a novel active inductor, similar to the previously reported active inductor but with a shunt variable resistor inserted in the feedback loop, is proposed for miniaturizing the circuit. The chip size of the fabricated GaAs MESFET active inductor is less than 0.52mm^2. Next, a low-loss analop phase shifter with a large phase shift is presented. This is constructed in an MIC structure with the active inductors, the varactor diodes and the low-loss polyimide/alumina-ceramic multilayer broad-side coupler. Furthermore, since the amount of the phase shift is the sum of the two individual tuning ranges attributed to the active inductors and varactor diodes, a large phase shift is obtained compared to the case where only the varactor diodes are tunable. Thus, a phase shift of more than 270° within 2-dB insertion loss from 2.1 to 2.4GHz is obtained with the fabricated single-stage reflection-type analog phase shifter. The total power consumption is less than 80mW.
社団法人電子情報通信学会の論文
1998-06-25