Researchers from the Taiyuan Institute of Technology have introduced a novel graphene RF NEMS capacitive switch and conducted an extensive analysis of its RF performance within the UWB frequency range of DC ~ 140 GHz.
Schematic representation of the proposed graphene RF NEMS capacitive switch: (a) a 3D isometric view; (b) a top view. Image credit: Scientific Reports
The monolayer graphene RF NEMS switch is characterized by its low pull-in voltage, rapid switching time, and superior RF performance, contrasting with the comparatively inferior performance of multilayer graphene RF NEMS switches.
The investigation into the working mechanism reveals that the electric field strength is highest near the central conductor, diminishing on either side of the suspended graphene beam. In the “OFF”state, the current flows downward through the dielectric layer of the beam, ensuring the switch’s stable operation.
Simulation results reveal that the monolayer graphene RF NEMS switch maintains an insertion loss of 0.003 ~ 0.015 dB and an isolation greater than 40 dB across an ultra-wideband (UWB) frequency range of DC ~ 140 GHz. Moreover, the switch demonstrates a switching time of 4.03 ps at a pull-in voltage of 1 V.
The graphene RF NEMS switch offers significant advantages, including minimal size, lightweight, cost-effectiveness, low pull-in voltage, rapid response time, excellent RF performance, and reduced space consumption in circuitry. Its potential applications span a range from L to F bands, encompassing data storage, communication systems, sensors, remote sensing and military uses.