Connector having fixed portions of a shell, differential pair of signal contacts and a ground contact arranged in a row forming a fixed portion group

A connector assembly comprising:

• a circuit board formed with fixing portions;
• and
• a connector mountable on the circuit board in an up-down direction, the connector comprising a holding member, a shell, one or more of shell fixed portions, one or more of ground contacts and one or more of differential pairs,
• wherein:
• each of the shell fixed portions is connected to the shell and is fixed to a corresponding one of the fixing portions of the circuit board;
• each of the ground contacts has a connection portion held by the housing and a ground fixed portion which is fixed to a corresponding one of the fixing portions of the circuit board;
• each of the differential pairs consists of two signal contacts;
• each of the signal contacts has a connection portion held by the housing and a signal fixed portion which is fixed to a corresponding one of the fixing portions of the circuit board;
• the connection portions of the ground contacts and the connection portions of the signal contacts are arranged in a row in a pitch direction perpendicular to the up-down direction;
• the connection portions of the two signal contacts of each of the differential pairs are adjacent to each other with no part of any of the ground contacts therebetween in the pitch direction;
• the shell fixed portions, the ground fixed portions and the signal fixed portions form one or more of fixed-portion groups;
• each of the fixed-portion groups consists of one of the shell fixed portions, one of the ground fixed portions and the two signal fixed portions of one of the differential pairs;
• in each of the fixed-portion groups, the shell fixed portion, an outside signal fixed portion and an inside signal fixed portion of the two signal fixed portions, and the ground fixed portion are arranged in a row along the pitch direction;
• in each of the fixed-portion groups, a distance D2 is not smaller than a distance D3 ×0.8 and is not larger than the distance D3 ×1.2, wherein the distance D2 is a distance along the pitch direction between an inner edge of the fixing portion fixed to the shell fixed portion and an outer edge of the fixing portion fixed to the outside signal fixed portion, which is adjacent to the shell fixed portion, and the distance D3 is a distance along the pitch direction between an outer edge of the fixing portion fixed to the ground fixed portion and an inner edge of the fixing portion fixed to the inside signal fixed portion, which is adjacent to the ground fixed portion;
• and
• when each of the fixed-portion groups is seen along the pitch direction, at least a part of the shell fixed portion occupies an area same as a part of the outside signal fixed portion.