In microwave frequency band the conductivity of graphene can be varied to design a number of tunable components. A tunable phase shifter based on commercial graphene nanoplatelets is introduced. The proposed configuration consists of a microstrip line with two stubs connected with a taper. On each side of the stubs there is a gap, short circuited through a via, where the commercial graphene nanoplatelets are drop casted. By applying a DC bias voltage that alters the graphene resistance the phase of the transmitted signal through the microstrip line can be varied. In order to maximize the phase shift of the transmitted signal and minimize the insertion loss, the length of the taper and the stubs are optimized by the help of circuit model and full-wave simulations. A prototype working at 4GHz is fabricated and measured. A phase variation of 33 degrees is acquired with an amplitude variation of less than 0.4 dB.

中文翻译：

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具有商用石墨烯纳米片的动态可调相移器。

在微波频带中，可以改变石墨烯的电导率以设计许多可调组件。介绍了一种基于商用石墨烯纳米片的可调相移器。提议的配置包括一条微带线，该微带线带有两个与锥度相连的短截线。在桩的每一侧都有一个间隙，该间隙通过通孔短路，在其中滴铸商用石墨烯纳米片。通过施加改变石墨烯电阻的直流偏置电压，可以改变通过微带线传输的信号的相位。为了最大程度地提高发射信号的相移并最小化插入损耗，可以借助电路模型和全波仿真来优化锥度和短截线的长度。制作并测量了工作在4GHz的原型。