High density electrical connector with improved grounding bus

Claim 1

An electrical connector for being mounted on a mother board, comprising: an insulative housing defining a plurality of channels; a plurality of printed substrates partially received in the channels; and a spacer including a plurality of wafers and defining a plurality of tunnels between every two adjacent wafers, the printed substrate being also partially received in the tunnels, each wafer having a body portion, a plurality of terminals retained in the body portion and conductively contacting with signal traces formed on a corresponding printed substrate, and a grounding bus covering the body portion and having a plurality of grounding members located on opposite sides of the body portion for conductively contacting with grounding traces formed on the corresponding printed substrate and on a neighboring printed substrates; wherein the plurality of wafers are side-by-side arranged; wherein the body portion of each wafer defines in one side surface thereof a plurality of passageways for receiving the terminals and a plurality of slots for receiving corresponding grounding members oaf the grounding bus; wherein the grounding bus has a body plate covering on another side surface of the body portion of each wafer, a flange vertically extending from an upper edge of the body plate and covering a to face of the body portion of each wafer, and a plurality of grounding tails depending from a lower edge of the body plate for insertion into corresponding through holes of the mother board; wherein the grounding members include a plurality of grounding tabs depending from the flange and received in corresponding slots of the body portion, a plurality of grounding ribs and a plurality of dimples on the body plate of the grounding bus, both opposite to the grounding tabs; wherein each of the grounding tabs and grounding ribs forms a contact protrusion conductively contacting a corresponding grounding trace on the printed substrate; wherein a plurality of stop blocks vertically extend fronm the body plate of the grounding bus for preventing the printed c=substrate from overdue insertion into a corresponding tunnel, each aligned with a corresponding grounding tail; further comprising a fastening device attached to the housing for retaining the spacer and the printed substrate to the housing; wherein the fastening device has a body wall and a pair of latch arms extending from the body wall; wherein each latch arm forms a latch projection, and wherein the housing defines a recessed cavity latching with the latch projection.