An electrical connector includes an electrically insulative holder member, a signal module formed of a circuit board with recessed holes, circuit lines, electrical contacts and via-holes and metal contact terminals and metal mounting terminals, and a metal shield. The metal contact terminals have rear soldering end portions thereof respectively soldered to respective circuit lines, front contact portions thereof positioned in front ends of the recessed holes of the circuit board and middle suspension arms thereof connected between the rear soldering end portions and the front contact portions below the recessed holes and elastically deformable to prevent damage. The circuit lines electrically connect the 5 pcs of electrical contacts and the 4 pcs of metal contact terminals to the 9 pcs of via-holes. The surface area of each circuit line may be modified to adjust impedance for reducing interference.