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Abstract
An offset-fed reflectarray antenna composed of single-layer elements based on the combination of circular and square concentric rings of variable size is presented in this paper. The characteristics of the elementary cells have been optimized providing a lineal phase curve with a phase range higher than 360°. The 297 × 297 mm reflectarray has been designed, fabricated, and measured to operate at 16 GHz and radiates the main beam in the direction given by θ = 10° and = 0°. In spite of utilizing a thin substrate, measured results of the linearly polarized reflectarray demonstrate a 1 dB gain bandwidth of 15.48% and radiation efficiency of 52.36% with a peak gain of 32.21 dB. Also, the measurements exhibit a cross-polar discrimination better than 27 dB in the working frequency band.
Acknowledgements
This work has been supported, in part by the Comunidad de Madrid Project S-2009/TIC1485 and by the Castilla-La Mancha Project PPII10-0192-0083, by the Spanish Department of Science, Technology Projects TEC 2010-15706 and CONSOLIDER-INGENIO No. CSD-2008-0068.