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In , 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 , 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.
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