ANTENNA FOR TRANSMITTING AND/OR RECEIVING MICROWAVE RADIATION

摘要

An apparatus for transmitting and/or receiving microwave radiation includes an energy source for generating signals at microwave frequency; an antenna having individual elements arranged at progressively higher levels; and an energy feeding network for feeding the signals to the individual elements in a manner such that the amplitude of the energy and the second derivative of phase with respect to height are each at a maximum between the bottom and the centre of the antenna. In a preferred embodiment the apparatus is a radar system for use at an airport to detect aircraft.