3-D Printed Circularly Polarized Modified Fresnel Lens Operating at Terahertz Frequencies

Wu, Geng‐Bo; Zeng, Yunbo; Chan, Ka Fai; Qu, Shi‐Wei; Chan, Chi Hou

doi:10.1109/tap.2019.2908110

Cited by 82 publications

(36 citation statements)

References 22 publications

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“…Another type of lens for mmWave and THz operations is the Fresnel lens [170]. A Fresnel lens consists of a number of alternately transparent and opaque half-wave zones.…”

Section: Reflectarraysmentioning

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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“…Another type of lens for mmWave and THz operations is the Fresnel lens [170]. A Fresnel lens consists of a number of alternately transparent and opaque half-wave zones.…”

Section: Reflectarraysmentioning

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

View full text Add to dashboard Cite

show abstract

“…In order to reduce the loss and dispersion of the optical system for terahertz signals, materials with high transmission coefficient and relatively stable refractive index in a wide frequency range are generally used to make terahertz lenses [7][8][9]. When electromagnetic waves interact with matter, the transmission coefficient can be given by the Fresnel formula [10][11][12]:…”

Section: Terahertz Window Materialsmentioning

confidence: 99%

Design and Application of Optical System Based on Terahertz Time-of-Flight Imaging

Wang¹,

Liu²,

Wang³

et al. 2021

Int J Opt Photonic Eng

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Using the penetration and transientness of Terahertz pulses and the photoconductive delayed detection method, the tomographic imaging of the interior of the object based on the time of flight can be realized. By comparing the transmittance of several crystals and polymers in the Terahertz band, Polymethylpentene (TPX) was selected as the material of Terahertz lens, and High Resistivity Float Zone Silicon (HRFZ-Si) as the material of beam splitter; By comparing the focal depth of normal incidence and oblique incidence optics system, the normal incidence optical system was used to realize time-of-flight imaging; Using the idea of optical-mechanical integration, the corresponding optical camera is designed according to the normal incidence optical system, and the peak-to-valley map and thickness map of the Lithium cobaltate coating of aluminum foil were obtained by time-of-flight imaging, and the defects such as complete shedding of the coating and uneven thickness were observed. The results show that the normal incidence optical system can realize Terahertz time-of-flight imaging and is applicable in the industrial nondestructive testing field.

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“…3D‐printed technologies for THz quasi‐optical components: A, measured frequency dependent spot size and FWHM for two FDM‐printed plano‐convex spherical lenses made of polystyrene; B, Fresnel, fractal, and Fibonacci THz diffractive lens (from top to bottom), fabricated by SLS with nylon polyamide granular powders (left), and measured THz irradiance at the plane of the lens (right); C, hemispherical lens antenna fabricated using DLP with Monocure 3DR3582C polymer, mounted on the WR‐3 waveguide flange; D, circularly polarized (CP) modified Fresnel lens and anisotropic metamaterial polarizer fabricated using SLA. 3D, three‐dimensional; DLP, digital light processing; FDM, fused deposition modeling; SLA, stereolithography apparatus; SLS, selective laser sintering; THz, terahertz…”

Section: D‐printed Quasi‐optical Componentsmentioning

confidence: 99%

“…Measured results demonstrated a gain of approximately 16 dBi at 0° over the entire band, and a fractional bandwidth of 37% was achieved. A SLA‐printed circularly polarized (CP) modified Fresnel lens integrated with dielectric anisotropic metamaterial was demonstrated by Wu et al, as shown in Figure D. The layer thickness and laser spot size are 25 and 140 μm, respectively.…”

Section: D‐printed Quasi‐optical Componentsmentioning

confidence: 99%

Three‐dimensional printing technologies for terahertz applications: A review

Sun

2019

Int J RF Microw Comput Aided Eng

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Three-dimensional (3D) printing technologies enables fast prototyping of complex 3D objects with ever improving printing qualities. To date, 3D printing has been found useful in areas such as manufacturing, industrial design, aerospace, dental and medical industries, and many others. In this article, we review recent advances of 3D printing technologies for terahertz (THz) applications. Different 3D printing technologies and printable materials are first discussed and compared. 3D-printed THz components and devices, which are categorized as waveguides/fibers, antennas, and quasi-optical components, are further demonstrated. It is found that the performances and functionalities of 3D-printed THz devices have been greatly enhanced, while the operating frequencies have been increased from the lower end of THz range to over 1 THz region. With further development of novel materials and printing techniques, it is believed that 3D printing technologies will play an important role in the realization of THz components for efficient control and manipulation of THz waves. K E Y W O R D S

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3-D Printed Circularly Polarized Modified Fresnel Lens Operating at Terahertz Frequencies

Cited by 82 publications

References 22 publications

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

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

Design and Application of Optical System Based on Terahertz Time-of-Flight Imaging

Three‐dimensional printing technologies for terahertz applications: A review

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