Patent ID: 7042305

Claim:
A termination for absorbing electromagnetic energy provided by a transmission line and for transferring any resulting heat to a heat sink, said termination comprising: a) a housing in communication with said transmission line for receiving said electromagnetic energy, said housing also being in communication with said heat sink for transferring said resulting heat thereto; b) a conductor disposed within said housing, said conductor cooperating with said housing to provide an internal transmission line structure for confining and guiding said electromagnetic energy within said termination; and, c) an absorber having a composite structure comprising a lossy dielectric and a low-loss dielectric in at least a portion of the termination, said low-loss dielectric being disposed between said conductor and said lossy dielectric, and said lossy dielectric being disposed adjacent to said housing, said absorber being disposed within said housing and being in communication with said internal transmission line for receiving said electromagnetic energy, said absorber absorbing said electromagnetic energy according to an absorption profile of said termination, said absorber also converting the absorbed electromagnetic energy into said resulting heat and being in communication with said housing for transferring said resulting heat thereto, wherein said low-loss dielectric has a thickness adapted for increasing the spread of said electromagnetic energy through said absorber for adjusting the absorption profile of said termination and, wherein said conductor has a narrow width in a first region where said incoming electromagnetic energy is at full strength for reducing the absorption in said first region and a greater width in a second region where said incoming electromagnetic energy is reduced, due to absorption in the first region, for increasing the amount of absorption in said second region.