Patent ID: 6992495

Claim:
A shielded probe apparatus for testing a semiconductor device, comprising: a shielded probe for probing the semiconductor device; a tri-axial cable coupled to a test equipment; a shielded chassis; and the tri-axial cable and the shielded probe being configured and arranged to connect to each other within the shielded chassis; wherein the tri-axial cable comprises: a center signal conductor; a dielectric layer, the center signal conductor being surrounded by the dielectric layer; a conductive layer, the dielectric layer being surrounded by the conductive layer; a guard layer, the conductive layer being surrounded by the guard layer; a second dielectric layer, the guard layer being surrounded by the second dielectric layer; a shield, the second dielectric layer being surrounded by the shield; and a protective cover, the shield being surrounded by the protective cover wherein the guard layer is driven to the same potential as the center signal conductor, and the shield is grounded to the shielded chassis.