Yasir Muhammad, Peinetti Fabio, Savi Patrizia
Division of Microrobotics and Control Engineering, Department of Computing Science, University of Oldenburg, 26129 Oldenburg, Germany.
Department of Electronics and Telecommunications, Politecnico di Torino, 10129 Torino, Italy.
Micromachines (Basel). 2023 Sep 29;14(10):1877. doi: 10.3390/mi14101877.
In this work, an enhanced tunable microwave phase shifter is presented. The phase shifter consists of three short circuited stubs and a tapered line. The stubs are connected to graphene pads. Graphene's tunable conductivity is varied by a DC voltage. This in turn causes a reactance variation at the input of the tapered line, which causes a phase variation. The physical parameters of the stubs are optimized for a maximum reactance variation by the help of analytical models, circuit and full wave simulations. Measurements of an optimized prototype are performed and a dynamic phase variation of 59∘ is obtained with an amplitude variation of less than 1 dB.
在这项工作中，提出了一种增强型可调谐微波移相器。该移相器由三个短路短截线和一条渐变线组成。短截线连接到石墨烯垫上。石墨烯的可调电导率通过直流电压来改变。这进而在渐变线的输入端引起电抗变化，从而导致相位变化。借助解析模型、电路和全波仿真对短截线的物理参数进行了优化，以实现最大电抗变化。对优化后的原型进行了测量，获得了59°的动态相位变化，幅度变化小于1 dB。
