Patent ID: 7284915

Claim:
A subassembly apparatus comprising: a housing with a substantially shieldable interior chamber for housing at least one source of electromagnetic radiation; a connector plane external to the housing for locating an end surface of a connector; a launch window for locating an end surface of a waveguide, the launch window being in or adjacent to the connector plane; an internal propagation path extending from the interior chamber to the connector plane; and a metallic coating on the end surface of the connector in the propagation path, the metallic coating and the connector being fixed to each other, the metallic coating being arranged to shield a planar region from the electromagnetic radiation emitted from within the interior chamber, the planar region comprising substantially the connector plane substantially excluding the launch window, the metallic coating defining an aperture having a diameter that corresponds to a diameter of the waveguide and substantially exposes only the end surface of the waveguide to the electromagnetic radiation.