Center conductor with surrounding shield and edge card connector with same

1. An edge card connector comprising:

a connector housing;

a plurality of center conductors disposed in the connector housing, spaced apart from one another, and arranged to make contact with a surface of an edge card when the edge card is inserted into the edge card connector; and

a plurality of shields disposed in the connector housing, surrounding three sides of a corresponding one of the plurality of center conductors, and arranged to make contact with the surface of the edge card when the edge card is inserted into the edge card connector; wherein

each of the plurality of center conductors includes a fixed portion that is fixed with respect to the connector housing and a movable portion that is movable with respect to the connector housing;

each of the plurality of shields includes a fixed portion that is fixed with respect to the connector housing and a movable portion that is movable with respect to the connector housing; and

only air is located between the movable portion of each of the plurality of center conductors and the corresponding movable portion of each of the plurality of shields.

2. An edge card connector comprising:

a connector housing;

a plurality of center conductors disposed in the connector housing and spaced apart from one another; and

a plurality of shields disposed in the connector housing and surrounding three sides of a corresponding one of the plurality of center conductors; wherein

each of the plurality of center conductors includes a contact portion that is arranged to make contact with a surface of an edge card when the edge card is inserted into the edge card connector; and

two sides of each of the plurality of shields are arranged to make contact along the surface of the edge card, when viewed from a side of the edge card connector, from below to above where the contact portion makes contact with a surface of the edge card when the edge card is inserted into the edge card connector.

3. A substrate comprising:

signal pads arranged on a surface of the substrate; and

ground pads arranged on the surface of the substrate such that there is a ground pad on each side of a corresponding signal pad that is located closer to the corresponding signal pad than any other signal or ground pad; wherein

the ground pads are longer than the signal pads and are arranged such that, when viewed in plan, the ground pads extend above and/or below the signal pads.

4. A substrate of claim 3 , wherein the signal pads and the ground pads are arranged along an edge of the substrate.