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Radio-frequency and microwave load comprising a carbon-bonded carbon fiber composite

United States Patent

April 21, 1998
View the Complete Patent at the US Patent & Trademark Office
Oak Ridge National Laboratory - Visit the Partnerships Directorate Website
A billet of low-density carbon-bonded carbon fiber (CBCF) composite is machined into a desired attenuator or load element shape (usually tapering). The CBCF composite is used as a free-standing load element or, preferably, brazed to the copper, brass or aluminum components of coaxial transmission lines or microwave waveguides. A novel braze method was developed for the brazing step. The resulting attenuator and/or load devices are robust, relatively inexpensive, more easily fabricated, and have improved performance over conventional graded-coating loads.
Lauf; Robert J. (Oak Ridge, TN), McMillan; April D. (Knoxville, TN), Johnson; Arvid C. (Lake in the Hills, IL), Everleigh; Carl A. (Raleigh, NC), Moorhead; Arthur J. (Knoxville, TN)
Lockheed Martin Energy Systems, Inc. (Oak Ridge, TN)
08/ 620,616
March 22, 1996
This invention was made with Government support under contract DE-AC05-84OR21400 awarded by the Office of Energy Efficiency and Renewable Energy, U.S. Department of Energy to Lockheed Martin Energy Systems, Inc. The Government has certain rights in the invention.