Low reflectance high power RF load

摘要

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.

主权项

1. A load for RF traveling waves having:
a first end cap with an aperture for an input waveguide coupled to a source of RF traveling wave energy; a cylindrical body sealed on one end by said first end cap and sealed on an opposite end by a second end cap; a reflector for receiving RF energy from said waveguide and reflecting said RF traveling wave energy to the inner surface of said cylindrical body, said reflector positioned in an axial extent closer to said first end cap than said second end cap; said reflector, said cylindrical body, and said first and second end cap having partially reflective inner surfaces which in combination form a path of successive reflection whereby said RF traveling wave energy is reflected to the back surface of said reflector.