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International Journal of Antennas and Propagation
Volume 2014 (2014), Article ID 171637, 10 pages
Research Article

Voltage Controlled Intertwined Spiral Arrays for Reconfigurable Metasurfaces

1Department of Electronics and Electrical Engineering, University of Sheffield, Sheffield S1 3JD, UK
2Institute of Electronics, Communications and Information Technology, Queen’s University of Belfast, Belfast BT3 9DT, UK

Received 2 December 2013; Accepted 9 February 2014; Published 20 March 2014

Academic Editor: Douglas H. Werner

Copyright © 2014 A. Vallecchi 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.


Reconfigurable bistate metasurfaces composed of interwoven spiral arrays with embedded pin diodes are proposed for single and dual polarisation operation. The switching capability is enabled by pin diodes that change the array response between transmission and reflection modes at the specified frequencies. The spiral conductors forming the metasurface also supply the dc bias for controlling pin diodes, thus avoiding the need of additional bias circuitry that can cause parasitic interference and affect the metasurface response. The simulation results show that proposed active metasurfaces exhibit good isolation between transmission and reflection states, while retaining excellent angular and polarisation stability with the large fractional bandwidth (FBW) inherent to the original passive arrays.