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Ultra-wideband flat metamaterial GRIN lenses assisted with additive manufacturing technique

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posted on 07.01.2021, 11:40 by Shiyu Zhang, Ravi Kumar Arya, William WhittowWilliam Whittow, Darren Cadman, Raj Mittra, J. C. Vardaxoglou
The paper presents the designs of ultra-wideband microwave flat gradient index (GRIN) lenses, which realizes over a 108% fractional bandwidth (12 - 40 GHz). The frequency-independent ray optics method is employed to determine the radially varying permittivity profile of the lenses. The challenge of realizing such a radially varying profile, and the limitations in dielectric material choices, are overcome by two additive-manufacturing-aided approaches: (i) partially infilled dielectrics with a varied periodicity, which ensures the lens performance at the higher end of the frequency range; and (ii) artificially engineered dielectrics (AED) with sub-wavelength-scale metallic inclusions, which enables high permittivity dielectrics and leads to benefits of thickness and mass reduction for the GRIN lenses. Measured results demonstrate that the GRIN lenses improve the gain of open-ended waveguide sources by 8.7 to 15.6 dB over a wide frequency range from 12 to 40 GHz, with the realized gain of up to 23.6 dBi. Both the simulation and measurements of the presented design confirm the potential of implementing the proposed GRIN lens design in high directivity and beamforming antenna applications, across an ultra-wideband frequency range.

Funding

SYnthesizing 3D METAmaterials for RF, microwave and THz applications (SYMETA)

Engineering and Physical Sciences Research Council

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History

School

  • Mechanical, Electrical and Manufacturing Engineering

Published in

IEEE Transactions on Antennas and Propagation

Volume

69

Issue

7

Pages

3788 - 3799

Publisher

Institute of Electrical and Electronics Engineers (IEEE)

Version

VoR (Version of Record)

Rights holder

© The Authors

Publisher statement

This is an Open Access Article. It is published by IEEE under the Creative Commons Attribution 4.0 International Licence (CC BY 4.0). Full details of this licence are available at: https://creativecommons.org/licenses/by/4.0/

Acceptance date

24/11/2020

Publication date

2020-12-21

Copyright date

2021

ISSN

0018-926X

eISSN

1558-2221

Language

en

Depositor

Dr Shiyu Zhang. Deposit date: 4 January 2021