Broadband wide-angle terahertz antenna based on the application of transformation optics to a Luneburg lens

Amarasinghe, Yasith; Mendis, Rajind; Shrestha, Rabi; Guerboukha, Hichem; Taiber, Jochen; Koch, Martin; Mittleman, Daniel M.

doi:10.1038/s41598-021-84849-8

Cited by 20 publications

(6 citation statements)

References 27 publications

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“…The efficacy of various THz beamforming techniques is demonstrated in Figure 7, focusing on flexibility and power consumption. THz lenses or reflectors ( [21], including mechanical rotation, quasioptical lenses [22,23], Luneburg lenses [24,25,26,27], Fresnel zone plates [28], and reflectors [29,30,31]) offer simplicity but are generally large and lack flexibility. THz dispersive radiators, encompassing leaky-wave antennas [32,33,34,35] and slotted waveguide antennas, feature frequency tunability and low power consumption.…”

Section: Discussionmentioning

confidence: 99%

Passive THz Optoelectronic Beamforming Network

Ming

2023

Preprint

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Section: Discussionmentioning

confidence: 99%

Passive THz Optoelectronic Beamforming Network

Ming

2023

Preprint

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“…Alternatively, employing bigger Luneburg lenses increases the tag's RCS and therefore the range, as well as allowing for more repetitions of the PhC coding particles for wide angle identification. Future development of our work can be focused on the development of a wide-angle quasiconformal transformation optics-based lens [44], or a metasurface-based reflecting lens [45] to increase the maximum detection angle of the retroreflective tag. In addition, other retroreflective layer topologies should be considered to increase the angular range for the identification part, such as a modification of the 3-bit tag presented in [46].…”

Section: Discussionmentioning

confidence: 99%

Sub-THz Luneburg lens enabled wide-angle frequency-coded identification tag for passive indoor self-localization

Kaděra

Sánchez-Pastor

Schmitt

et al. 2022

Int. J. Microw. Wireless Technol.

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An earlier version of this paper was presented at the 2021 15th European Conference on Antennas and Propagation (EuCAP) and was published in its Proceedings. This paper describes a design, fabrication, and characterization of a planar frequency-coded retroreflector for indoor localization. The retroreflector is fabricated in high-resistive silicon and consists of a Luneburg lens antenna and a photonic crystal high-Q resonator reflective layer, providing ranging and identification within the same tag and bandwidth. The Luneburg lens antenna presents a measured gain of 21.63 dBi at a design frequency of 240 GHz. The frequency-coded retroreflector allows for ranging in a continuous 130 degree angular range in azimuthal plane, with a discrete but repeatable two-resonance identification over multiples of 15 degree. Its maximum measured radar cross-section is −23.48 dBsqm at a frequency of 240 GHz. The retroreflective tag set in ideal line-of-sight situation is compared to a non-line-of-sight arrangement showing the influence of a metallic rod as an obstacle on the overall tag detection parameters. Finally, the successful read-out of the retroreflective tag is discussed in unknown environments, where no a-priori information is available.

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“…A flattened Luneburg lens for the THz regime, based on the application of quasi-conformal TO, was reported in [86]. This design considered a reduction in the dimensionality of the lens, from three to two.…”

Section: Luneburg Lensmentioning

confidence: 99%

Quasi-Optical Multi-Beam Antenna Technologies for B5G and 6G mmWave and THz Networks: A Review

Guo

Ansari

Ziolkowski

et al. 2021

IEEE Open J. Antennas Propag.

116

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Multi-beam antennas are critical components in future terrestrial and non-terrestrial wireless communications networks. The multiple beams produced by these antennas will enable dynamic networking of various terrestrial, airborne and space-borne network nodes. As the operating frequency increases to the high millimeter wave (mmWave) and terahertz (THz) bands for beyond 5G (B5G) and sixth-generation (6G) systems, quasi-optical techniques are expected to become dominant in the design of high gain multibeam antennas. This paper presents a timely overview of the mainstream quasi-optical techniques employed in current and future multi-beam antennas. Their operating principles and design techniques along with those of various quasi-optical beamformers are presented. These include both conventional and advanced lens and reflector based configurations to realize high gain multiple beams at low cost and in small form factors. New research challenges and industry trends in the field, such as planar lenses based on transformation optics and metasurface-based transmitarrays, are discussed to foster further innovations in the microwave and antenna research community.

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Broadband wide-angle terahertz antenna based on the application of transformation optics to a Luneburg lens

Cited by 20 publications

References 27 publications

Passive THz Optoelectronic Beamforming Network

Passive THz Optoelectronic Beamforming Network

Sub-THz Luneburg lens enabled wide-angle frequency-coded identification tag for passive indoor self-localization

Quasi-Optical Multi-Beam Antenna Technologies for B5G and 6G mmWave and THz Networks: A Review

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