Stacked coaxial cavity combiner for combining a plurality of amplifiers, the combiner having an outer conductor wall and plural inner conductor blocks

A stacked coaxial cavity radio frequency power combiner comprising:

• a device main body comprising an outer wall, the outer wall comprising an outer conductor and defining an inner cavity extending along a central axial direction of the device main body;
• a plurality of amplifier modules arranged in a plurality of amplifier layers stacked in the central axial direction while being spaced apart from each other, wherein each of the amplifier layers circumferentially surrounds the device main body, and
• wherein each amplifier module comprises:
• an external portion formed outside of the outer wall and protruding outward in a radial direction orthogonal to the central axial direction, and
• an internal portion exposed to the inner cavity and having formed thereon an input coupler protruding inward in the radial direction;
• an inner conductor, including a plurality of inner conductor blocks, wherein the inner conductor blocks are stacked and spaced apart from each other by a respective predetermined inner gap in the central axial direction in the inner cavity of the device main body, and wherein each of the inner conductor blocks is positioned to overlap a respective one of the amplifier layers;
• at least one inner insulating support located between the plurality of inner conductor blocks;
• and
• an output coupler provided at one side of the device main body and extending to an exterior of the device main body,
• wherein both ends of the inner conductor include a respective side gap to provide a capacitance, and electromagnetic waves of the input coupler of each of the plurality of amplifier modules are input to the output coupler through the plurality of inner conductor blocks.