Space-fed antenna based on dielectric-only transmitarray

In this work, preliminary results on the design of a dielectric transmitarray (TA) antenna are presented. The unit-cell consists in two circular cylinders located on the two sides of a thin square slab, with size
$\boldsymbol{ 0.3}\lambda$
at the central frequency, realized with the same dielectric material of the cylinders. The amplitude and phase of the transmission coefficient are controlled varying the diameter of the cylinders, while their height is kept constant. In order to minimize the unit-cell thickness, but at the same time assuming that 3D printing techniques will be used for the TA manufacturing, a dielectric material with
$\varepsilon_{r}= 10$
is considered. The results obtained from the simulation of a transmitarray working in Ka-band with size
$\mathbf{15}\lambda\times \mathbf{15}\lambda$
are presented and discussed.