Flat Luneburg Lens via Transformation Optics for Directive Antenna Applications

Carolina Mateo-Segura; Amy Dyke; Hazel Dyke; Sajad Haq; Yang Hao

doi:10.1109/TAP.2014.2302004

Flat Luneburg Lens via Transformation Optics for Directive Antenna Applications

Carolina Mateo-Segura, Amy Dyke, Hazel Dyke, Sajad Haq, Yang Hao

School of Engineering & Physical Sciences

Research output: Contribution to journal › Article › peer-review

199 Citations (Scopus)

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Abstract

The great flexibility offered by transformation optics for controlling electromagnetic radiation by virtually re-shaping the electromagnetic space has inspired a myriad of dream-tailored electromagnetic devices. Here we show a 3D-transformed microwave Luneburg lens antenna which demonstrates high directivity, low side-lobe level, broadband response and steerable capabilities. A conventional Luneburg lens is redesigned accounting for dielectric materials that implement a coordinate transformation, modifying the lens geometry to accommodate its size and shape for potential high power applications. An all dielectric flat lens is manufactured following a thorough holistic analysis of ceramic materials with different volume fractions of bi-modal distributed titanate fillers. Fabrication and measurements of a 3-D flat Luneburg lens antenna validate the design and confirm a high-directivity performance. A maximum directivity of 18.03dBi, low side-lobe levels for both main planes ~ -15dB, bandwidth limited only by the source employed and beam-steering up to 35° were achieved.

Original language	English
Pages (from-to)	1945-1953
Journal	IEEE Transactions on Antennas and Propagation
Volume	62
Issue number	4
Early online date	22 Jan 2014
DOIs	https://doi.org/10.1109/TAP.2014.2302004
Publication status	Published - Apr 2014

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abstract = "The great flexibility offered by transformation optics for controlling electromagnetic radiation by virtually re-shaping the electromagnetic space has inspired a myriad of dream-tailored electromagnetic devices. Here we show a 3D-transformed microwave Luneburg lens antenna which demonstrates high directivity, low side-lobe level, broadband response and steerable capabilities. A conventional Luneburg lens is redesigned accounting for dielectric materials that implement a coordinate transformation, modifying the lens geometry to accommodate its size and shape for potential high power applications. An all dielectric flat lens is manufactured following a thorough holistic analysis of ceramic materials with different volume fractions of bi-modal distributed titanate fillers. Fabrication and measurements of a 3-D flat Luneburg lens antenna validate the design and confirm a high-directivity performance. A maximum directivity of 18.03dBi, low side-lobe levels for both main planes ~ -15dB, bandwidth limited only by the source employed and beam-steering up to 35° were achieved.",

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Flat Luneburg Lens via Transformation Optics for Directive Antenna Applications

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