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Design optimisation of ring elements for broadband reflectarray antennas
Plane wave scattering from a flat surface consisting of two periodic arrays of ring
elements printed on a grounded dielectric sheet is investigated. It is shown that the reflection phase
variation as a function of ring diameter is controlled by the difference in the centre resonant
frequency of the two arrays. Simulated and measured results at X-band demonstrate that this
parameter can be used to reduce the gradient and improve the linearity of the reflection phase
versus ring size slope. These are necessary conditions for the re-radiating elements to maximise the
bandwidth of a microstrip reflectarray antenna. The scattering properties of a conventional dual
resonant multilayer structure and an array of concentric rings printed on a metal backed dielectric
substrate are compared and the trade-off in performance is discussed.
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