Abstract
This paper describes a graphene-based Yagi-Uda antenna with a dual-band response. The proposed antenna consists of four parasitic elements and one driven element are made up of graphene material. The driven element is excited by a 50 Ω pec microstrip feedline connected through a PEC vias. The proposed antenna operates at a lower band and upper band of 7.7 THz and 8.3 THz respectively. The antenna provides a dual-band response as well as high directivity of 7.89 dBi at 7.6 THz. The maximum efficiency and high front to back ratio (FBR) have been obtained as 84 % and 15.4 dB respectively. Furthermore, the resonant frequency can be tuned by varying the external bias voltage of graphene elements. The configuration of antenna is generated higher order mode such as TM22, TM24 and TM26 for lower band and TM42, TM44 and TM46 for the upper band of the proposed antenna. The antenna has been obtained dual-band which can be useful for different applications simultaneously in both the band. Moreover, the proposed antenna has potential application in THz communication systems such as biomedical application: spectroscopy, endoscope, and cancer imaging, screening for weapons, explosive as well as nano communication networks, etc.
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