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Low reflectance high power RF load

United States Patent

February 2, 2016
View the Complete Patent at the US Patent & Trademark Office
A load for traveling microwave energy has an absorptive volume defined by cylindrical body enclosed by a first end cap and a second end cap. The first end cap has an aperture for the passage of an input waveguide with a rotating part that is coupled to a reflective mirror. The inner surfaces of the absorptive volume consist of a resistive material or are coated with a coating which absorbs a fraction of incident RF energy, and the remainder of the RF energy reflects. The angle of the reflector and end caps is selected such that reflected RF energy dissipates an increasing percentage of the remaining RF energy at each reflection, and the reflected RF energy which returns to the rotating mirror is directed to the back surface of the rotating reflector, and is not coupled to the input waveguide. Additionally, the reflector may have a surface which generates a more uniform power distribution function axially and laterally, to increase the power handling capability of the RF load. The input waveguide may be corrugated for HE11 mode input energy.
Ives; R. Lawrence (San Mateo, CA), Mizuhara; Yosuke M. (Palo Alto, CA)
Calabazas Creek Research, Inc. (San Mateo, CA)
14/ 172,911
February 5, 2014
The present invention was developed under the United States Department of Energy grant DE-SC0001930. The government has certain rights in this invention.