Backboard connector and combination thereof

The invention discloses a backboard connector. The backboard connector comprises a plurality of conductive sheets. Each conductive sheet comprises a conductive supporting piece, a plurality of signal terminal pairs and a shielding piece, wherein each signal terminal pair comprises a butt joint part, a middle part and a mounting part, the conductive supporting piece is provided with a first surface, a second surface and a plurality of terminal grooves, wherein the first surface and the second surface are opposite to each other, and each terminal groove penetrates through a butt joint end, a mounting end and the first surface, so that each terminal groove is provided with an upper inner wall surface, a lower inner wall surface and a side inner wall surface; each signal terminal pair is accommodated in the corresponding terminal groove; the butt joint part is located between the upper and lower inner wall surfaces and the side inner wall surface of the corresponding terminal groove; and the shielding piece is at