A broadband beamformer for millimeter-wave systems using sub-band sampling

In this paper, a broadband beamforming system for millimeter-waive systems is proposed. DOA is estimated by sampling only part of signal spectrum, thus the beamformer system does not require high speed sampling rate of A/Ds. In addition, an I/Q vector attenuation scheme was used for the IF weighting process. For the weighting process, a balanced structure of a reflection type variable attenuator was used in order to obtain a linear phase response within 500 MHz bandwidth at IF of 2.75 GHz.

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