This work investigates theoretically the characteristics of various
terahertz antenna configurations formed by metallic CNT materials
after modeling their conductivity accurately. The frequency
dependent complex conductivity of the CNT material is taken into
account in the investigation of these advanced antennas. The
concept of effective conductivity is introduced for both SWCNT and
MWCNT to make them in analogy with conventional antennas made of
bulk metallic wires. This is useful to apply Maxwell's equations
simply to predict the electromagnetic properties of the CNT
antennas. Quantitative predictions of the performance of CNT
antenna dipoles, including input impedance, reflection coefficient,
gain, and efficiency, are presented as a function of frequency.
Simulation is carried further to predict the performance
characteristics of square loop, circular loop, and helical
antennas. All antenna configurations are simulated using computer
simulation technology (CST) microwave studio (MWs) software package
which is based on finite integration technique (FIT) instead of
MoM. The results indicate that impedance matching is a serious
problem in CNT antennas.
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