ADVANCES IN REFLECTARRAY BANDWIDTH ENLARGEMENT

An aperture coupled reflectarray element, with smooth and linear phase variations, is proposed for bandwidth enhancement by exploiting the spacing between adjacent elements in the array grid. The comparison of phase curves computed at various frequencies for some test cases is used to prove reflectarray bandwidth enlargement. As further validation, radiation pattern measurements have been performed to compare bandwidth features of two 20 GHz reflectarray prototypes with different cell size.