A novel and improved dielectric lens assembly (100) includes a dielectric extension (108) on a hemispherical dielectric lens (104), to provide a dielectric lens which exhibits properties of an elliptical lens. The extended dielectric lens can be implemented with a feed antenna (112) to improve the directivity of the antenna. The extension portion (108) of the lens assembly (100) is fabricated using a plurality of dielectric wafers disposed on the bottom surface of the hemisphere, an angled extension (516), or a cylindrical extension. The entire hemispherical lens and extension assembly (508) can be a single piece of dielectric material formed into the desired shape, or the assembly can be fabricated using a plurality of dielectric components (512, 516) coupled together to form the lens assembly.