Patent ID: 6948942

Claim:
A board-to-board connector assembly, which is adapted to electrically connect a first circuit board and a second circuit board, comprising: a) a receptacle connector including: soldered to the second circuit board and having: i) a flat insulative housing having a mating surface and a soldering surface, and a plurality of passageways being transversely defined through opposite sides of the insulative housing, an engaging groove located in the insulative housing; ii) a plurality of conductive terminals received in the passageways, and each conductive terminal including a contact portion at an end thereof, a soldering portion at an opposite end thereof and a connecting portion between the contact portion and the soldering portion, wherein the contact portion projecting slightly from the mating surface of the insulative housing providing a vertical signal transmission to the first circuit board; and b) an engaging element received in the engaging groove of the insulative housing and having positioning portions thereon guiding the receptacle connector to mate with the first circuit board accurately and facilitates the conductive terminals to contact first electrodes on the first circuit board firmly, wherein the insulative housing is rectangular, the engaging groove having an H-shape and including a middle groove longitudinally extending across a middle of the insulative housing and a pair of side grooves, each of the pair of side groove is located on one of two opposing ends of the middle groove, the engaging element having a shape corresponding with the engaging grove and including a middle pole inserted into the middle groove and a pair of side poles, one of the pair of side poles is inserted into each of the pair of side grooves.