Patent ID: 7283014

Claim:
A power absorbing waveguide termination for a waveguide transmission line comprising a power receiving end for attaching to a waveguide transmission line, said power receiving end having a waveguide input port for receiving power from the waveguide transmission line to which it is attached, an oversize waveguide section which is larger, in cross-section, than the waveguide input port of said power receiving end, said oversize waveguide section having a center axis and a back end, a waveguide transformer section between said power receiving end and said oversize waveguide section, a manifold end block at the back end of said oversize waveguide section, said manifold end block having a fluid inlet passage and fluid outlet passage, and a dielectric taper having a point end and a base end fluidly connected to said manifold end block, said taper extending from its base end into said oversize waveguide section, and being inclined relative to the center axis of said oversize waveguide section so as to position the point end of said dielectric taper in a region of relatively low electric field strength within a portion of the waveguide termination formed by said tapered waveguide section and oversize waveguide section, said dielectric taper having fluid circulating passage therein in communication with the fluid inlet passage and fluid outlet passage of said manifold end block, wherein a fluid can be circulated from said manifold end block through said taper from the base end to the point end thereof and back to absorb microwave power received from the waveguide transmission line to which the power absorbing termination is attached.