Tunable antenna radome based on graphene frequency selective surface

Abstract

In this paper, a graphene-based frequency selective surface (FSS) is proposed. The proposed FSS exhibits a tunable bandpass filtering characteristic due to the alterable conductivity of the graphene strips which is controlled by chemical potential. Based on the reconfigurable bandpass property of the proposed FSS, a cylindrical antenna radome is designed using the FSS unit cells. A conventional omnidirectional dipole can realize a two-beam directional pattern when it is placed into the proposed antenna radome. Forward and backward endfire radiations of the dipole loaded with the radome is realized by properly adjusting the chemical potential. The proposed antenna radome is extremely promising for beam-scanning in terahertz and mid-infrared plasmonic devices and systems when the gain of a conventional antenna needs to be enhanced.

A graphene‐based tunable miniaturized‐element frequency selective surface in terahertz band and its application in high‐isolation multiple‐input multiple‐output system

“…Besides, the center resonance frequency of the stop band shows an obvious blue shift from 1.76 to 2.56 THz when increasing the chemical potential of the graphene from 0 to 0.5 eV, which is due to the fact that the conductivity of the graphene is increased with the increase of the chemical potential. Similar blue shift phenomena have been reported in other graphene‐based reconfigurable devices . Figure B shows the corresponding reflection coefficients.…”

“…Fortunately, graphene is a potential candidate to replace the varactor diode owning to its tunable surface conductivity within the THz frequency range. Recently, some graphene‐based THz FSSs have been reported . However, the dimensions of these devices is still too large for future highly integrated circuits.…”

A graphene‐based tunable negative refractive index metamaterial and its application in dynamic beam‐tilting terahertz antenna

“…In this work, τ and T are set as 1 ps and 300 K, respectively . Moreover, only the intra‐band conductivity is considered during the numerical simulation, because the contribution of the inter‐band conductivity is very small when the frequency range is less than 10 THz …”

Graphene Logo Patch Antenna

“…These relations indicate that the graphene mobility or conductivity can be controlled using an external bias voltage V DC which can change the conductivity of the graphene flake. Many research works have been published in the past for Graphene applications within the THz frequency region [19] - [21] and few works have been presented in GHz region [22] - [24]. The work in this paper presents an application of graphene patch within GHz range and its comparison to the copper conductor for an antenna patch behavior.…”