Trw Limited

Edwin D Dair

Barry Ross Allen

Randy J Duprey

A hermetic RF pin grid array package methodology is described that obviates the need for glass to metal feedthroughs, simplifying construction, improving reliability and reducing the cost of RF multi-chip modules. An array of cylindrical passages (13, 15) through the module's base plate (3) are aligned with and receive respective associated conductor pins (7, 9) depending from the module substrate (1). Cylindrical metal shrouds (11) are positioned within some passages (15) combine with associated pins (9) to define coaxial RF transmission lines and support for an external RF coax coupling. Unshrouded pins (7) serve to connect DC to the integrated circuit chips in the module. Waveguide interfaces, if required, are provided by conductive coupling structures patterned on the substrate, suspended over a waveguide (17) formed in or about the baseplate. The compartmentalized seal ring (5) attached to the top surface of the substrate provides a metal framework that divides the interior area, providing individual compartment for the distinct RF circuits in the module, including the integrated circuit chips associated with each such RF circuit.

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Redondo Beach, CA, United States of America

Edwin D Dair