Abstract
A simple scheme for the realization of the terahertz (THz) fundamental-mode tunable closed-stopband composite right/left-handed leaky-wave antennas (CRLH LWAs) is presented. The proposed CRLH LWAs are reconstructed by graphene-based coplanar waveguide (CPW) transmission line supercells. Their shunt inductances achieved by narrow graphene strips of two unit cell structures are halved. The CRLH LWAs are designed and confirmed by numerical simulations. They also exhibit frequency-scanning behaviors at THz with narrower bandwidth than that of the conventional graphene-based fundamental-mode CPW unit cell CRLH LWAs at THz. Besides, the LWAs also exhibit strong tunable characteristics and achieve the closed-stopband condition more effectively. Therefore, the proposed supercell CRLH LWAs could further improve the performance of the beam-steering antennas at THz.
Highlights
With the rapid development of the transmission rates of wireless communication, radar and satellite systems, terahertz (THz) antenna technology is a hot research area [1]
TM01 lateral mode has been proposed to be employed in other structures for the achievement of Composite right/left-handed (CRLH) Leaky-wave antennas (LWAs) at THz [4], [5]
Derrick argues that CRLH LWAs can be realized through the first higher-order lateral mode propagated along the graphene ribbon with periodic gaps [7]
Summary
With the rapid development of the transmission rates of wireless communication, radar and satellite systems, terahertz (THz) antenna technology is a hot research area [1]. The conventional graphene-based CPW unit cell CRLH LWAs cannot completely close the stopband. The implement of the graphene-based CPW supercell technology is supposed to realize the CRLH LWAs at THz with closed-stopbands [8]. The graphene-based CPW supercells is reconstructed to achieve the narrow-band CRLH leaky-wave structures as Fig. 1(a) shows. Their narrow graphene strips for realizing the shunt inductance components LL are halfed of each two conventional graphene-based CRLH unit cells. The proposed supercell LWAs would futher improve the performance of beam-steering antennas at THz
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