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Specular Reflection Analysis for Off-Specular Reflectarray Antennas

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2 Author(s)
El hani, R. ; Electr. Eng. Dept., Ecole Polytech. de Montreal, Montreal, QC, Canada ; Laurin, J.-J.

It is known that for reflectarrays designed to radiate in an off-specular direction, part of the scattered field may still be directed in the specular direction. In this paper, a reflectarray made of single-layer patch elements is considered. The dependence of the unwanted specular reflection on the size of the patches is examined. Moreover, in a global analysis of the reflectarray, we show that this specular reflection can be due to a periodic error occurring in the applied phase shift. It is found that this periodic error is also responsible for the occurrence of a parasitic lobe in backward directions.

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Antennas and Propagation, IEEE Transactions on  (Volume:61 ,  Issue: 7 )