Waveguide termination

An apparatus comprising:

• a hollow waveguide having a length, a cross-sectional periphery and an end portion;
• a plate having a plurality of elongated holes and a first aperture;
• a waveguide shorting plate disposed between the end portion of the waveguide and the plate wherein the shorting plate has a nonuniform thickness and a second aperture coaxial with the first aperture;
• an electromagnetic energy absorbent element disposed through the first and second apertures and within the hollow waveguide, said energy absorbent element having a length, and a bore extending substantially through the length of the absorbent element, with said absorbent element being disposed at a lateral offset from the center of the waveguide and wherein the energy absorbent element further has a first portion having a first dimension, an end portion having a second dimension being smaller than the first dimension, and a second portion having a third dimension which gradually tapers from the first dimension to the second dimension;
• means, coupled to said absorbent element, for providing a liquid coolant to the bore of the absorbent element;
• a plurality of screws for coupling the plate and the means for providing a liquid coolant to the waveguide shorting plate;
• and
• wherein the plate having the elongated holes in combination with the plurality of screws allows the lateral position of the absorbent element to be adjusted with respect to the waveguide width.

An apparatus comprising:

• a waveguide shorting plate having a first aperture;
• a housing having a plurality of ports;
• a plate disposed between the waveguide shorting plate and housing having a plurality of elongated holes and a second aperture;
• a corresponding plurality of fasteners coupling said plate and housing to the waveguide shorting plate;
• an electromagnetic energy absorbent element disposed through said first and second apertures, having a length, a bore extending substantially the length of the absorbent element, and a lipped portion disposed at the open end of said absorbent element, wherein the energy absorbent element is disposed through said first and second apertures;
• a tube having a first end coupled to a first one of the plurality of ports, a first portion disposed through a second one of the plurality of ports and a second end disposed within the bore of the absorbent element, such that a liquid coolant provided to the first one of the plurality of ports passes from the first end to the second end of the tube and is expelled from the housing through a third one of the plurality of ports;
• first sealing means, disposed between the lipped portion of the absorbent element and the plate, for providing an air-tight seal between the element and the plate;
• second sealing means, disposed between the lipped portion of the absorbent element and the housing, for providing a fluid-tight, air-tight seal between the element and housing;
• and
• third sealing means, disposed between the plate and the waveguide shorting plate, for providing an air-tight seal between the plate and shorting plate.