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.
Highlights
Frequency selective surface (FSS) is a kind of spatial filters which can been widely used in electromagnetic applications, including radomes, shields, radar cross-section reduction, high-impedance surfaces and so on.[1,2,3,4,5,6,7] It prevents or permits the propagation of electromagnetic waves in a specified band of frequency
The resonant frequency is 2.66 THz when chemical potential is set to 0 eV specially
The simulated scattering parameter |S11| is plotted in Figure 4, and it can be seen that the operating frequency band below -10 dB is from 2.53 to 2.8 THz, which is included in the frequency band of FSS when the chemical potential is 0 eV
Summary
Frequency selective surface (FSS) is a kind of spatial filters which can been widely used in electromagnetic applications, including radomes, shields, radar cross-section reduction, high-impedance surfaces and so on.[1,2,3,4,5,6,7] It prevents or permits the propagation of electromagnetic waves in a specified band of frequency. FSS is becoming attractive in improving performance of the antenna.[18,19,20,21] Pattern diversity in multiband antenna system can be achieved by adopting a conformal FSS.[18] An approach to suppress mutual coupling of electromagnetic fields between two circularly polarized antennas using FSS is proposed in Ref. 19. A wideband folded dipole antenna is set above a quad-resonant absorbing ground plane which could effectively reduce the antenna’s radar cross section.[21] This aforementioned methods inspire the design of the proposed tunable radome. The proposed FSS with filtering bandpass characteristic reflects electromagnetic waves outside the operating band, and transmits electromagnetic waves within the working band. The maximum gain of 10.11 dB and front-to-back ratio of 21 dB are achieved at the same time
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