Patent ID: 6339712
Filing Date: 2002-01-15
Classification: H01Q

Abstract:
Method for reduction of intermodulation distortion in radio communication, in which a signal, which is intended to be transmitted, is fed to an active antenna for transmission in a main lobe, the antenna comprising a plurality of transmitter stages, each of which is supplied with a partial signal and comprises an input stage, an amplifier, an output stage and an antenna element, the method comprising:performing a first phase rotation of each partial signal before the respective amplifier, performing a second phase rotation of each partial signal after the respective amplifier, choosing a sum of the first phase rotation and the second phase rotation to have a value which is constant, and choosing said second phase rotation so that an intermodulation lobe which is transmitted from the antenna is controlled in a predetermined direction which deviates substantially from the direction of said main lobe in a manner such that the chosen second phase rotation corresponds to a predetermined value of an angle of said predetermined direction with respect to the direction of said main lobe.