Wave transmission lines and networks – Long line elements and components – Waveguide elements and components
Patent
1999-01-18
2000-09-12
Bettendorf, Justin P.
Wave transmission lines and networks
Long line elements and components
Waveguide elements and components
333239, H01P 108
Patent
active
06118358&
ABSTRACT:
A high average-power microwave window is provided whose thermal conductivity has been enhanced to enable it to transmit higher average RF power levels than conventional windows of the same size. Such a window is suitable for use with high-average power RF sources such as klystrons and magnetrons. The window comprises a ceramic substrate, typically a low-loss ceramic such as alumina or quartz, to which narrow strips of a high thermal conductivity material have been bonded. One such high thermal conductivity material is synthetic polycrystalline diamond, which can be bonded to the surface of a dielectric substrate using a high-temperature cement or can be directly deposited on the surface by a process such as chemical vapor deposition (CVD). High-purity alumina, a commonly-used material for high-power RF windows, has a thermal conductivity of 26.4 W/m.multidot..degree. C., while synthetic diamond has a thermal conductivity of 1000 W/m.multidot..degree. C., 2.6 times that of copper and 38 times that of alumina. The novel feature is the use of high thermal conductivity strips to increase the effective thermal conductivity of a microwave window by providing low-resistance paths by which heat can be extracted from the window, resulting in a significant increase in the window's power-handling capacity.
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Bettendorf Justin P.
Collins David W.
Lenzen, Jr. Glenn H.
Rudd Andrew J.
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