A coaxial cable connector assembly and a receptor connector are provided. The coaxial cable connector assembly is composed at least of one cable end connector and the receptor connector. The receptor connector is formed of an insertion space with a lateral insertion opening to allow one portion of the cable end connector to be inserted into the insertion space through the lateral insertion opening such that the cable end connector and the receptor connector are in electrical connection. The cable end connector will be constrained such that it cannot be detached from the receptor connector in the direction other than the lateral insertion opening.