Electrical connector with improved signal transmitting performance

An electrical connector comprising:

• a middle board defining a plurality of receiving holes;
• a first insulative housing mounted on a first surface of the middle board and defining a first receiving room for receiving a first mating connector;
• a second insulative housing mounted on a opposite surface of the middle board and defining a second receiving room for receiving a second mating connector;
• a plurality of contacts mounted on the first and the second insulative housings, each of the contacts comprising a first mating portion received in the first receiving room, a second mating portion received in the second receiving room, and a twisted portion between the first and second mating portions, each of the first mating portions comprising a first edge parallel to a row direction and having a first width, and a first broad side perpendicular to the first edge and having a second width greater than the first width, each of the second mating portions comprising a second broad side parallel to the row direction and having a third width, and a second edge perpendicular to the second broad side and having a fourth width less than the third width;
• wherein the first edges are used for mating with the first mating connector, and the second broad sides are used for mating with the second mating connector;
• wherein the contact has a straight strip shape;
• and
• wherein each of the contacts comprises a mounting portion connecting with the twisted portion, the first mating portion extending from the mounting portion along the first direction, the second mating portion extending from the twisted portion along the second direction.

An electrical connector comprising:

• a printed circuit board defining thereof opposite first and second surfaces to form corresponding first and second receiving spaces thereon;
• a plurality of through holes defined in the printed circuit board with rows and columns through both said first and second surfaces respectively;
• a plurality of pin type contacts extending through the corresponding through holes, with opposite first and second ends disposed in the corresponding first and second receiving spaces, respectively, and
• each of said contacts defining a rectangular cross-section defined by two opposite smooth sides derived from an original sheet metal and two opposite rough sides derived from a stamping procedure under condition that said two opposite smooth sides are perpendicular to said two opposite rough sides;
• wherein in the first receiving space, the smooth sides of said contacts are parallel to a first plane in the first receiving space while in the second receiving space the smooth sides of said contacts are parallel to a second plane perpendicular to said first plane;
• wherein each of the contacts defines a middle twisting section between the first and second ends;
• wherein said twisting section is received in the corresponding through hole;
• and
• wherein in each contact, a cross-section from the first end to the middle twisting section is not larger than that of the middle twisting section so as to allow the contact to be inserted into the corresponding through hole from the first end.