Patent ID: 8761700
Filing Date: 2014-06-24
Classification: H04B

Abstract:
1. An active antenna array for a mobile communications network comprising: a plurality of antenna elements (Ant-1, Ant-2, . . . , Ant-N) for relaying radio signals at a first frequency band, the plurality of antenna elements (Ant-1, Ant-2, . . . , Ant-N) being connected to a plurality of signal paths; a plurality of signal inputs for inputting radio signals at a third frequency band and being connected to the plurality of signal paths; a plurality of first mixers in the plurality of the signal paths for converting the frequency of the radio signals between the first frequency band and a second frequency band, a plurality of second mixers connected to outputs of the plurality of first mixers in the plurality of signal paths and for converting the frequency of the radio signals between the second frequency band and the third frequency band; a plurality of first local oscillators connected to the plurality of first mixers; and a plurality of second local oscillators being connected to different ones of the plurality of second mixers; and a single reference oscillator being connected to different ones of the plurality of first local oscillators through a plurality of first oscillator signal paths, to different ones of the plurality of second local oscillators through a plurality of second oscillator signal paths, and to a digital signal processor.