Investigation on bandwidth enhancement of dual frequency concentric ring square reflectarray element

This paper investigates a new designed element namely concentric element to improve the limited bandwidth of reflectarray element. This element is using single-layer configuration with an introduction of split concept into the element. The dual frequency operation is realized through the using of two elements of ring and ring square at 13.44 GHz and 18.36 GHz. The bandwidth broadening is observed improved from 19.8% to 20.3% in which comparable of solid and split element.