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

1 . 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.

2 . The stacked coaxial cavity radio frequency power combiner of claim 1 , wherein the device main body is provided such that a plurality of placement slots, into which each of the plurality of amplifier modules is inserted and installed, are stacked and spaced apart from each other into the plurality of amplifier layers.

3 . The stacked coaxial cavity radio frequency power combiner of claim 1 , wherein the device main body has a cylindrical or polyhedral shape.

4 . The stacked coaxial cavity radio frequency power combiner of claim 1 , wherein an uppermost part and a lowermost part of the device main body are provided with a conductive short-circuited side.

5 . The stacked coaxial cavity radio frequency power combiner of claim 1 , wherein each of the respective predetermined inner gaps is larger than either of the side gaps.

6 . The stacked coaxial cavity radio frequency power combiner of claim 5 , wherein each of the respective predetermined inner gaps is at least twice as large as either of the side gaps.

7 . The stacked coaxial cavity radio frequency power combiner of claim 1 , wherein each of the respective predetermined inner gaps is smaller than either of the side gaps.

8 . The stacked coaxial cavity radio frequency power combiner of claim 7 , wherein each of the respective predetermined inner gaps is provided as half of either of the side gaps.

9 . The stacked coaxial cavity radio frequency power combiner of claim 1 , further comprising:

a short-circuited side disposed on an uppermost part and a lowermost part of the device main body and forming the respective side gap with respect to a respective outermost inner conductor block of the inner conductor.

10 . The stacked coaxial cavity radio frequency power combiner of claim 9 , wherein the output coupler comprises:

an outer coupler portion configured to protrude to the exterior of the device main body; and

an inner coupler portion configured to connect to the outer coupler portion and disposed inside the device main body.

11 . The stacked coaxial cavity radio frequency power combiner of claim 10 , wherein an output port surrounding the output coupler at one end of the device main body is provided.

12 . The stacked coaxial cavity radio frequency power combiner of claim 10 , wherein the inner coupler portion is electrically connected to a central region of one surface of the respective outermost inner conductor block among the plurality of inner conductor blocks in either of the uppermost part or the lowermost part of the device main body.

13 . The stacked coaxial cavity radio frequency power combiner of claim 10 , wherein the respective outermost inner conductor block is spaced apart from the plurality of inner conductor blocks by the respective predetermined inner gap at corresponding one of the uppermost and lowermost parts of the device main body and is spaced apart from the short-circuited side by the respective side gap,

wherein the inner coupler portion extends from one outer end of the device main body to the inner cavity, and is provided as an inductive coupler to an outer surface of the respective outermost inner conductor block.

14 . The stacked coaxial cavity radio frequency power combiner of claim 13 , wherein the inner coupler portion is provided as a “U” shape.

15 . The stacked coaxial cavity radio frequency power combiner of claim 1 , further comprising a support placement groove in which the at least one inner insulating support is accommodated and provided at both sides of the corresponding inner conductor block.

16 . The stacked coaxial cavity radio frequency power combiner of claim 15 , wherein the corresponding inner conductor block has a cylindrical shape in which the support placement groove is disposed in a central region of an upper surface of the corresponding inner conductor block and a lower surface of the corresponding inner conductor block.