A substrate includes a substrate; a number of pad redistribution chips stacked on the substrate and on one another after being rotated 90° in a predetermined direction relative to one another, the pad redistribution chips having a number of center pads positioned at the center thereof, a number of (+) edge pads positioned on an end thereof while corresponding to those of the center pads lying in (+) direction from a middle center pad located in the middle of the center pads, a number of (−) edge pads positioned on the other end thereof while corresponding to those of the center pads lying in (−) direction with symmetry to those of the center pads lying in the (+) direction, and a number of traces for electrically connecting the center pads to the corresponding (±) edge pads, respectively; a flexible PCB for electrically connecting the substrate to the pad redistribution chips; and an anisotropic dielectric film for electrically connecting the pad redistribution chips to the flexible PCB and the substrate to the flexible PCB.