Antenna structures for spatial power-combining devices

A spatial power-combining device comprising:

• a coaxial waveguide section comprising an inner conductor and an outer conductor;
• and
• a plurality of amplifier assemblies, each amplifier assembly of the plurality of amplifier assemblies comprising:
• a body structure comprising a first face, a second face that is on an opposite side of the body structure than the first face, and an outer surface and an inner surface that are arranged between the first face and the second face such that the outer surface and the inner surface bound opposing sides of the first face and the second face;
• an amplifier arranged on the first face of the body structure;
• and
• an antenna structure coupled to the amplifier, the antenna structure being arranged between the inner conductor and the body structure such that the antenna structure is positioned in a portion of a coaxial waveguide channel defined between a portion of the body structure and a portion of the inner conductor.

An amplifier assembly comprising:

• a body structure comprising a first face, a second face that is on an opposite side of the body structure than the first face, and an outer surface and an inner surface that are arranged between the first face and the second face such that the outer surface and the inner surface bound opposing sides of the first face and the second face, wherein a length of the inner surface along the first face is less than a length of the outer surface along the first face such that a peripheral edge of the inner surface is inset from a peripheral edge of a remainder of the body structure;
• an amplifier arranged on the first face of the body structure;
• and
• an antenna structure coupled to the amplifier, wherein the antenna structure is positioned to laterally extend outside the peripheral edge of the inner surface in a direction from the inner surface toward the peripheral edge of the body structure.