Transformation optics inspired multibeam lens antennas for broadband directive radiation

Qi Wu, Zhi Hao Jiang, Oscar Quevedo-Teruel, Jeremiah P. Turpin, Wenxuan Tang, Yang Hao, Douglas H. Werner

Research output: Contribution to journalArticle

55 Scopus citations

Abstract

Recent advancements in transformation optics (TO) and metamaterials have inspired tremendous interest in the electromagnetic community, creating a variety of novel antennas with enhanced performance, such as broad bandwidth, large gain, and high polarization efficiency. Although there could be infinitely many transformations for designing a given device, most of them result in rather complicated material compositions. This paper compares two recently introduced TO techniques, both of which lead to much simpler material requirements. In particular, a linear geometrical transformation or a quasi-conformal mapping was employed to design multi-beam collimating lenses, which possess either homogeneous or isotropic constituent materials. A systematic comparison is made for the first time between these two TO design approaches for a specific example of a quad-beam focusing lens, where the advantages and disadvantages of each method are clearly identified. Full-wave numerical simulations were performed to demonstrate the well-collimated beams produced by the TO lenses designed by either transformation. The characteristics of the two lens antennas, such as radiation pattern and bandwidth, were contrasted, providing valuable guidance on design tradeoffs for a specific application.

Original languageEnglish (US)
Article number6605519
Pages (from-to)5910-5922
Number of pages13
JournalIEEE Transactions on Antennas and Propagation
Volume61
Issue number12
DOIs
StatePublished - Dec 2013

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering

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