Electrical connector with enhanced mating mechanism

An electrical connector assembly, comprising:

• a plug connector having a first mating portion and a plurality of first contacts positioned on the first mating portion;
• and
• a receptacle connector having a second mating portion for mating with the first mating portion and a plurality of second contacts positioned on the second mating portion;
• wherein
• one of the first and second mating portions comprises an inner engaging bar, and when the plug connector mates with the receptacle connector, the engaging bar urges the other of the first and second mating portions to engage with said one of the first and second mating portions, and makes the first and second contacts reliably connect with each other;
• wherein
• the engaging bar is formed on a rear portion of said one of the first and second mating portions, and extends in a rear-to-front direction;
• wherein
• the engaging bar comprises an inclined surface at a front end thereof;
• wherein
• the plug connector comprises a receiving cavity, and the receptacle connector comprises a tongue portion formed as the second mating portion to be inserted into the receiving cavity of the plug connector,
• further comprising a metallic shield having an upper shield and a lower shield for shielding a housing of the plug connector and the first contacts, the upper shield having at one end an upper panel and a lower panel opposite to said upper panel.