Investigations on some wideband reflectarray elements for Ku band

In this study, investigations on sub-wavelength and multi-resonant single layer reflectarray elements have been carried out for enhanced bandwidth. Elements such as (1) parallel sub-wavelength dipoles, (2) sub-wavelength circular rings, (3) /-shaped dipole surrounded by rectangular split rings, and (4) L-shaped stub loaded square ring are analyzed by employing substrates of varied thicknesses and dielectric constants for their reflection phase performances, which is then plotted as a function of frequency. The analysis has been carried out by using unit cell approach in CST MW Studio 2017. It is interesting to note that the typical reflection phase bandwidth of these elements is in the range of 40% and 57% in Ku and X-Ku bands.