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International Journal of Antennas and Propagation
Volume 2017 (2017), Article ID 7694281, 17 pages
https://doi.org/10.1155/2017/7694281
Review Article

Technologies for Near-Field Focused Microwave Antennas

Department of Information Engineering, University of Pisa, Via G. Caruso 16, 56122 Pisa, Italy

Correspondence should be addressed to Giuliano Manara

Received 7 September 2016; Revised 20 November 2016; Accepted 13 December 2016; Published 19 March 2017

Academic Editor: Shiwen Yang

Copyright © 2017 Paolo Nepa et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

This paper provides a review spanning different technologies used to implement near-field focused antennas at the microwave frequency band up to a few tens of GHz: arrays of microstrip patches and printed dipoles, arrays of dielectric resonator antennas, reflectarrays, transmitarrays, Fresnel zone plate lenses, leaky-wave antennas, and waveguide arrays.