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International Journal of Antennas and Propagation
Volume 2012 (2012), Article ID 535673, 6 pages
http://dx.doi.org/10.1155/2012/535673
Research Article

Direct Synthesis of Dual-Parameter Concentric Ring RA with Enhanced Bandwidth

1Dipartimento di Energia, Politecnico di Milano, 20156 Milan, Italy
2Dipartimento di Elettronica e Telecomunicazioni, Politecnico di Torino, 10129 Turin, Italy

Received 3 March 2012; Accepted 25 June 2012

Academic Editor: Sandra Costanzo

Copyright © 2012 Bui Van Ha 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

Reflectarray antennas (RAs) are nowadays a quite popular technology, used in several applications, due to a significant number of attractive properties, such as low cost, low weight, conformal deployment, and the possibility of introducing suitable reconfigurable capabilities. Unfortunately, they present also some intrinsic limitations and drawbacks compared with other solutions and, in particular, a relatively narrow bandwidth; that of course could be enlarged, but generally with a drastic increase of the structure complexity. The objective of this work is the design of a single-layer passive reflectarray, in which the reradiated elements have no conventional shape and enough degrees of freedom to compensate both the spatial and frequency phase variation of the reradiated field. In particular, here we focus on a reradiating element consisting in two concentric square rings in which two different and quite independent geometric parameters are varied.