Graphene field-effect transistors(GFET) have attracted much attention in the radio frequency(RF) and microwave fields because of its extremely high carrier mobility. In this paper, a GFET with a gate length of 5 μm i...Graphene field-effect transistors(GFET) have attracted much attention in the radio frequency(RF) and microwave fields because of its extremely high carrier mobility. In this paper, a GFET with a gate length of 5 μm is fabricated through the van der Walls(vdW) transfer process, and then the existing large-signal GFET model is described, and the model is implemented in Verilog-A for analysis in RF and microwave circuits. Next a double-balanced mixer based on four GFETs is designed and analyzed in advanced design system(ADS) tools. Finally, the simulation results show that with the input of 300 and 280 MHz,the IIP3 of the mixed signal is 24.5 dBm.展开更多
The advancement of wireless communication raises the demand for flexible,high-performance RF antennas for wearable electronics and flexible communication devices.Traditional approaches focused on reducing the thicknes...The advancement of wireless communication raises the demand for flexible,high-performance RF antennas for wearable electronics and flexible communication devices.Traditional approaches focused on reducing the thickness of metal films to enhance flexibility which faces limitations due to the skin effect.Herein,a hybrid graphene-Au nanomembrane is produced by one-step delamination processes to address the limitations of traditional metal films,including flexibility and RF functionality.The graphene-Au nanomembrane features a bond-free van der Waals interface,allowing the Au layer move freely with graphene.This structure mitigates the formation of cracks,enhancing the stretchability to over 14%strain and fatigue resistance.Moreover,this composite overcomes the limitations associated with skin depth,consequently enabling an ultra-thin graphene-Au antenna operating at 8.5 GHz for 5 G communications.We also demonstrate wireless image transmission and electromagnetic stealth.The results underscore the significant impact of the innovative design and materials on flexible wireless technology.展开更多
基金National Natural Science Foundation of China(Grant Nos.51925208,61974157,61851401,62122082)Key Research Project of Frontier Science,Chinese Academy of Sciences(QYZDB-SSW-JSC021)+3 种基金Strategic Priority Research Program(B)of the Chinese Academy of Sciences(XDB30030000)National Science and Technology Major Project(2016ZX02301003)Science and Technology Innovation Action Plan of Shanghai Science and Technology Committee(20501130700)Science and Technology Commission of Shanghai Municipality(19JC1415500)。
文摘Graphene field-effect transistors(GFET) have attracted much attention in the radio frequency(RF) and microwave fields because of its extremely high carrier mobility. In this paper, a GFET with a gate length of 5 μm is fabricated through the van der Walls(vdW) transfer process, and then the existing large-signal GFET model is described, and the model is implemented in Verilog-A for analysis in RF and microwave circuits. Next a double-balanced mixer based on four GFETs is designed and analyzed in advanced design system(ADS) tools. Finally, the simulation results show that with the input of 300 and 280 MHz,the IIP3 of the mixed signal is 24.5 dBm.
基金supported by the National Key R&D Program of China(Grant Nos.2022YFB3204800,2022YFB4400100)National Natural Science Foundation of China(Grant Nos.51925208,62122082,52350209)+3 种基金Science and Technology Commission of Shanghai Municipality(Grant No.21JC1406100)CAS Project for Young Scientists in Basic Research(Grant No.YSBR-081)Strategic Priority Research Program of the Chinese Academy of Sciences(Grant No.XDB0670000)City University of Hong Kong Donation Research Grants(Grant nos.DON-RMG 9229021 and 9220061).
文摘The advancement of wireless communication raises the demand for flexible,high-performance RF antennas for wearable electronics and flexible communication devices.Traditional approaches focused on reducing the thickness of metal films to enhance flexibility which faces limitations due to the skin effect.Herein,a hybrid graphene-Au nanomembrane is produced by one-step delamination processes to address the limitations of traditional metal films,including flexibility and RF functionality.The graphene-Au nanomembrane features a bond-free van der Waals interface,allowing the Au layer move freely with graphene.This structure mitigates the formation of cracks,enhancing the stretchability to over 14%strain and fatigue resistance.Moreover,this composite overcomes the limitations associated with skin depth,consequently enabling an ultra-thin graphene-Au antenna operating at 8.5 GHz for 5 G communications.We also demonstrate wireless image transmission and electromagnetic stealth.The results underscore the significant impact of the innovative design and materials on flexible wireless technology.
