Patent ID: 8178792

Claim:
An electromagnetic and environment seal assembly comprising: an annular fitting of conductive material including an annular fitting portion; an annular tube of conductive material, the annular tube including an annular tube portion rotatably received within the annular fitting portion; an environmental seal interposed between the annular fitting and the annular tube, the environmental seal provides a rotatable coupling between the annular tube and the annular fitting; an electromagnetic seal adjacent the rotatable coupling, the electromagnetic seal includes a transmission line, the annular fitting portion overlying the annular tube portion is a first plate of the transmission line, and the annular tube portion is a second plate of the transmission line; and wherein the annular tube portion includes two or more grooves, the transmission line has one or more of a high impedance or a transfer function approaching zero at a predetermined operating frequency according to the dimensions of the two or more grooves.