Objective: The next generation wireless communication systems are a major research
concern of THz systems. The THz band offers very large bandwidth which is required for applications
involving ultra high data rates. The objective of this research paper is therefore, greatly focused
on the design and analysis of an ultra wideband antenna providing bandwidth enhancement.
The use of graphene patch as conducting material in the antenna possesses enormous potential to
enhance gain, radiation efficiency, radiated power and bandwidth on account of extraordinary electromagnetic
properties and functionalities of the graphene material.
Method: The graphene based nano-antenna has been accurately designed using finite element
method (FEM) based high frequency simulator (HFSS) software. This design introduces truncated
corners/edges in square nano-patch antenna with semi-circular radius of 0.7 µm to the microstrip
feeding line on SiO2 as substrate with thickness of 1.8 µm and permittivity of εr= 4 in THz region.
Result: The proposed design achieves the impedance bandwidth of 1.39 THz at 13.0 THz, 1.36
THz at 15.0 THz and more than 5THz at 18.0 THz. The 3D plot depicts gain and directivity, having
maximum value of 7.1011 dB and 7.2781 dB respectively at the resonant frequency. Truncations
in the antenna introduce co polarization and cross polarization. Further the radiation efficiency
for graphene based arc truncated square patch antenna on silicon dioxide substrate is determined
as a function of frequency for operating frequency band and has been observed to be more than
90% at respective resonant frequencies.
Conclusion: The performance of graphene based antenna has been evaluated considering equally
truncated arcs on its opposite corners and their effect on antenna characteristics is analyzed by determining
different parameters including bandwidth, return loss, VSWR, directivity, gain, radiation
efficiency, 2D and 3D radiation patterns. The antenna provides improved impedance bandwidth of
more than 5 THz in the band of operation from 10 to 20 THz. Moreover the gain, directivity and
radiation efficiency achieved are much improved for the proposed graphene antenna.