Electrical connector having a contact arrangement to improve the quality of the signal transmission

An electrical connector, comprising:

• an insulating housing including a mating portion with a mating port, said mating port having a geometric centre;
• a plurality of contacts retained on said mating portion and divided into an upper array and a lower array;
• wherein each array includes several first contacts and at least one pair of second contacts located on two sides of said first contacts, said first contacts of the upper array are centrally symmetric to the first contacts of the lower array relative to said geometric centre of the mating port;
• wherein said first contacts are signal contacts, said second contacts are power contacts;
• and
• wherein the first contacts of each array are divided into two groups which includes a first group far away from said geometric centre and a second group closer to the geometric centre.