Abstract
A hybrid dual-frequency polarized reconfigurable terahertz antenna is designed and studied. Graphene and TOPAS are employed as the polarization conversion metasurface and dielectric substrate, respectively, enabling tunable polarization conversion and circular polarization. TOPAS is a good substrate material for broadband THz components due to its low absorption. By adjusting the chemical potential of graphene between 0 eV and 0.5 eV, the polarization state in the band of 1 THz (0.76–1.02 THz) and 2.5 THz (2.43–2.6 THz) can be reconstructed. Thanks to the multilayer graphene structure and low absorption TOPAS, the graphene metasurface exhibits a broad bandwidth of 0.26 and 0.17 THz, respectively, in the band of 1 THz and 2.5 THz. The working state of the circularly polarized antenna and linearly polarized antenna can be switched in the bands around 1 THz (0.7–0.75 THz, 0.96–1.04 THz) and 2.5 THz (2.42–2.52 THz), respectively, without changing the physical geometry. Moreover, the graphene antenna, metasurface, and hybrid structure are tested, respectively, to verify that the components do not interfere with each other in performance. The hybrid antenna shows great potential in tunable terahertz devices and related applications.
Highlights
Terahertz (THz) technology shows bright application prospects in telecommunications [1], imaging, and sensitive detections [2]
Combined with the terahertz antenna, the working state of the circularly polarized antenna and linearly polarized antenna can be switched in the bands around
It is found that the distance between the center ofof theantenna antenna and and polarization conversion metasurfaces (PCM)
Summary
Terahertz (THz) technology shows bright application prospects in telecommunications [1], imaging, and sensitive detections [2]. MMs and MS have been widely used as a new method for changing the polarization state, such as linear-circular [11], linear-linear [12], and circular -circular [13] converters Micromachines 2021, 12, 1088 promising way is to combine antenna with graphene PCM to expand the polarization conversion functionality, which is expected to enable tunable linear polarization and circular polarization characteristics at the same working frequency band. Multi-band devices are promising in biomedicine [25], terahertz imaging [26], molecular material detection [27] and other advanced fields, but most miniaturized reconfigurable resonant antennas [28,29] have only one frequency band and cannot work in dual frequency bands with different polarization states at the same time. Combined with the terahertz antenna, the working state of the circularly polarized antenna and linearly polarized antenna can be switched in the bands around
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