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We describe the design, fabrication and measurements of an axisynunetric dielectric lens, featuring a sectorial radiation pattern at 77 GHz. It will be used as the primary feed of a tens-based compact antenna test range (CATR). Due to symmetry of revolution, the sectorial lens proffle can be designed in one dimension by using phase only control. The phase variation is echoed on the lens depth. The resulting stepped lens is simulated using France Telecom Orange Labs SRSRD software ("in-house" software developed for dielectric axisynunetric radiating structures) and measured in an anechoic chamber at 77 Gus. Two lenses were fabricated with different materials: PVC and polyurethane, respectively. Good agreements were obtained between simulations and measurements. Less than 0.2 dB ripple in the central beam are obtained for the polyurethane lens although relatively high secondary lobes occur at 110. Comparisons between the near field of a CATR illuminated by a small horn providing a uniform amplitude taper and the sectorial lens are conducted using numerical simulations. Results show that on-axis oscillations are reduced from 6 to I dB with the sectorial lens. [ABSTRACT FROM AUTHOR]