Fig. 7From: Directional modulation design for multi-beam multiplexing based on hybrid antenna array structuresComparisons of the magnitude responses based on the interleaved subarray structure and the localized subarray structure. a–d represent the magnitude responses of two multiplexed beams corresponding to beam \(b=0\), \(b=4\), \(b=8\), and \(b=12\), respectivelyBack to article page