Application of Nanotechnology in High Frequency and Microwave Devices

Abstract

The study of the ac properties of nano-electronic systems is one of the most discussed topics recently. To understand the high-frequency electronic properties of carbon nanotubes we should understand passive, ac impedance of a 1D quantum system. In this paper we have tried to use CNT in Substrate Integrated Waveguide (SIW) and Modified SIW (MSIW) to decrease the electrical energy loss. For this, firstly some of the basic concepts about nanoscale electromagnetic properties and the qualitative difference in circuit behavior at nanoscale is presented. Secondly the electrical properties of carbon NanoTube and graphene which are the two most technologically advanced examples have been discussed. Thirdly a comparative study of conductive and substrate loss in SIW and MSIW has been conducted for CNT-graphene system and copper system. Thus we have suggested the use of CNTgraphene instead of copper in this substrate. Simulation results with the CST Microwave Studio show 70% reduction in conductive insertion loss and 40% reduction in total insertion loss in SIW. We have also studied the use of graphene and CNT in MSIW; the result of simulation with HFSS software is presented as well.