Flat Luneburg Lens via Transformation Optics for Directive Antenna Applications

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

Research output: Contribution to journalArticle

94 Citations (Scopus)
437 Downloads (Pure)

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 languageEnglish
Pages (from-to)1945-1953
JournalIEEE Transactions on Antennas and Propagation
Volume62
Issue number4
Early online date22 Jan 2014
DOIs
Publication statusPublished - Apr 2014

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