FZPL

In [53], the -3dB spot size and the side lobe level (at both the targeted focal plane and the maximum field amplitude plane) have been analyzed as a function of the focal distance, for a set of FZPL antennas at the Ka-band (32 GHz).

A FZPL printed antenna focused in the NF region has been designed and characterized in [55], to be used for free-space material measurements at X-band.

Reid and Smith [56,57] analyzed the performance of such a system when the two doubly hyperbolic lenses are substituted with two grooved-dielectric phase-correcting FZPLs, since they are lighter and thinner than traditional lenses.