Efficient sideband suppression in 4D antenna arrays with multiple time modulation frequencies

A novel approach named multiple time modulation frequency (MTMF) is proposed for the effective suppression of sideband radiations in four-dimension (4D) antenna arrays. Each array element is operating at different frequencies and the sidebands of different units are avoided to be superimposed at the same frequencies. It results in the effective reduction of the maximum sideband levels. With the combination of MTMF and optimization strategy, a hybrid pattern synthesis approach is then proposed. This method is expected to pave the way of novel wireless systems with the lowest possible sideband radiations.