Millimeter wave sensor using cylindrical Luneberg lens with flat sides

The cylindrical lens with flat sides, which has the focal point just on the surface of the lens, is developed by using an artificial low-loss dielectric material, and the design of the lens is also given. The characteristics of the cylindrical lens fabricated in Teflon, and a millimeter-wave sensor, consisting of a millimeter-wave (MMW) antenna mounted at the focus, are also investigated at 40 GHz band. MMW sensors with the beam width of 16/spl deg/ and gain of 15.6 dB were obtained.