NDLI: 3D-printed 4-zone Ka-band Fresnel lens: design, fabrication, and measurement

Content Provider	IET Digital Library
Author	Jeong, Kyoung Ho Ghalichechian, Nima
Abstract	A planar and thin-grooved Fresnel lens is a great candidate for gain enhancement in millimetre wave communication, imaging systems, and wireless power transfer applications. The authors report the design, fabrication, and measurement of a 3D-printed Fresnel lens, using a single material. A low-profile (1.2 λ thick) 4-zone Fresnel lens with 16 annular rings is designed with a focal length of 40 mm (≃4λ) operating at 30 GHz. Authors’ design consists of four-step heights with outer radius of 69 mm (6.9λ). Permittivity and loss tangent of polylactic acid are measured to be 2.79 and 0.0048 at 30 GHz, respectively. Focusing ability of the lens is studied using full-wave simulation. The lens is fabricated using a table-top commercial fused deposition modelling printer. The surface roughness, step heights, and radii of each zone are measured and verified using a 3D optical profilometer. Impact of the 3D-printed limitation on performance of the device is discussed. The gain of the fabricated prototype is measured, in conjunction with a horn antenna, in an anechoic chamber. Pattern measurement results illustrate 6.6 dB gain enhancement at broadside at 30 GHz. Gain enhancing behaviour is studied at three different focal lengths and frequencies of 29–31 GHz.
Starting Page	28
Ending Page	35
Page Count	8
ISSN	17518725
Volume Number	14
e-ISSN	17518733
Issue Number	Issue 1, Jan (2020)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-map/14/1
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-map.2019.0117
Journal	IET Microwaves, Antennas & Propagation
Publisher Date	2019-08-30
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	3D Optical Profilometer 4-zone Ka-band Fresnel Lens Anechoic Chambers (electromagnetic) Annular Rings Antenna Radiation Pattern Dielectric Constant Loss Tangent Dielectric Material And Property Electromagnetic Compatibility Electromagnetic Wave Polarisation Fabricated Prototype Focal Length Four-step Heights Frequency 29.0 GHz to 31.0 GHz Frequency 30.0 GHz Full-wave Simulation Gain Enhancement Gain Enhancing Behaviour Horn Antenna Interference Lens Antenna Lenses Millimetre Wave Antenna Millimetre Wave Communication Noise Figure 6.6 DB Other Optical System Component Pattern Measurement Result Photonic Technology Planar Antenna Planar Grooved Fresnel Lens Radio Frequency Power Transmission Radio Link And Equipment Radius 69.0 Mm Single Antenna Size 11.8 Mm Size 40.0 Mm Table-top Commercial Fused Deposition Modelling Printer Thin-grooved Fresnel Lens Wireless Power Transfer Application
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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