Double-cut-angle E bent cavity type power combiner

Abstract

The invention relates to a double-cut-angle E-bend cavity type power combiner, which comprises a resonant cavity body, the resonant cavity body adopts a double-cut-angle E-bend resonant cavity structure, the front end surfaces of the two walls of the double-cut-angle E-bend resonant cavity structure are symmetrically provided with a plurality of first through holes, and the back of the double-cut-angle E-bend resonant cavity structure is provided with a second through hole; the number of the input couplers is set to be a plurality, one end of each input coupler penetrates through the corresponding first through hole and goes deep into the resonant cavity, and the other end of each input coupler serves as a radio frequency input port and is used for being in butt joint with a solid-state power amplifier module; and the output coupler is inserted into the second through hole, and an output port of the output coupler is used for being connected with a load. Therefore, the requirement of power cavity type synthesis output under lower frequency is met, the problem that the size of a rectangular cavity is too large under low frequency is solved, and the synthesis efficiency is high by adopting a first-stage synthesis method.

Description

Technical Field

[0001] The invention relates to a double-cut-angle E-bend cavity power synthesizer which is easy to be integrated into a cabinet and relates to the field of accelerators. Background Art

[0002] Solid-state power source equipment is a device that provides radio frequency energy for accelerators. The main way to achieve high power output is to combine multiple final-stage radio frequency power amplifier modules in parallel. Therefore, the development of low-loss and high-efficiency power synthesizers is a key technology to improve the performance of solid-state power sources.

[0003] The circuit-level power synthesis method is widely used in the power synthesis of solid-state RF power amplifier modules. According to whether it contains a resonant cavity, it can be divided into a resonant cavity power synthesizer and a non-resonant cavity power synthesizer. At present, the power synthesizers in solid-state power sources for accelerators are mainly non-resonant cavity power synthesizers, whose working bandwidth can be designed to be wider, and have the advantages of simple structure and easy processing. However, with the increase in the number of synthesis paths, its synthesis efficiency is seriously reduced. In comparison, the resonant cavity power synthesizer has a higher synthesis efficiency, large power capacity, and a narrow working bandwidth, which is very suitable for solid-state power source equipment for accelerators.

[0004] Commonly used cavity resonators include cylindrical resonators and rectangular resonators. The resonant frequency of a cylindrical resonator is often related to the diameter of the cylinder. For a 162.5MHz solid-state power source, its diameter has reached 1400 mm. In addition, the cylindrical cavity is not suitable for integration in a standard cabinet. A rectangular resonator can be well integrated in a standard cabinet, and its resonant frequency is often determined by the wide side and narrow side of the bottom of the resonator. Figure 1 As shown, the prior art discloses a 12-in-1 650MHz rectangular cavity power combiner with a long side length of 870 mm and a width of 260 mm. It can be combined in a standard cabinet, but it is often necessary to use an elbow to achieve docking with the power amplifier module. In this way, the bending moment at the elbow during the plugging and unplugging of the power amplifier is often too large to damage the connector. Secondly, for lower frequencies, such as 325MHz, its long side size will exceed 1 meter, which is not conducive to cabinet integration. Summary of the invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, in view of the above problems, the purpose of the present invention is to provide a double-cut E-bend cavity power combiner with high synthesis efficiency, large power capacity and easy cabinet integration.

[0006] In order to achieve the above-mentioned purpose of the invention, the technical solution adopted by the present invention is: the double-cut-angle E-bend cavity power combiner provided by the present invention comprises: A resonant cavity, wherein the resonant cavity adopts a double-cut-angle E-bend resonant cavity structure, a plurality of first through holes are symmetrically arranged on the front end surfaces of two walls of the double-cut-angle E-bend resonant cavity structure, and a second through hole is arranged on the back of the double-cut-angle E-bend resonant cavity structure; Input couplers, the number of which is set to be several, one end of each of the input couplers passes through the corresponding first through hole and extends deep into the resonant cavity, and the other end of each of the input couplers serves as a radio frequency input port for connecting to a solid-state power amplifier module; An output coupler is inserted into the second through hole, and an output port of the output coupler is used to connect to a load.

[0007] In some possible implementations, the resonant cavity exhibits Glyph, The two bends of the font are configured as angle-cut bend structures. The front end surfaces of the two walls of the character are arranged to be rectangular cross sections.

[0008] In some possible embodiments, each of the cut angle bending structures includes three cut angles, the first cut angle is at an angle of 22.5° with the horizontal direction, the second cut angle is at an angle of 45° with the horizontal direction, and the third cut angle is at an angle of 22.5° with the vertical direction, wherein the side length of the third cut angle is equal to the side length of the first cut angle.

[0009] In some possible implementations, the first through hole is centrally symmetrical with respect to the length direction and the width direction of the resonant cavity, and the first through hole is disposed at the edge positions of the front end surfaces of the two walls of the cut-angle bending structure.

[0010] In some possible implementations, the input coupler includes a closed coupling ring, an input coaxial port, an embedded disk, and a support disk; The closed coupling ring is connected to the corresponding first through hole through the embedded disk, and the embedded disk is also connected to the outer wall of the resonant cavity through an external flange disk to ensure good grounding of the closed magnetic coupling ring; one end of the support disk is fixedly connected to the embedded disk, and the other end of the support disk is connected to the input coaxial port, wherein the input coupling degree is adjusted by adjusting the insertion depth and rotation angle of the closed coupling ring inside the resonant cavity.

[0011] In some possible implementations, the input coaxial port adopts a standard 1_5 / 8 inch RF input port interface, and the input adopts 50Ω characteristic impedance matching.

[0012] In some possible implementations, the embedded disk is in a ring shape, and the diameter of the embedded disk should match the diameter of the first through hole so that the embedded disk can be directly embedded in the first through hole.

[0013] In some possible implementations, the closed coupling loop adopts a "gate" shaped structure, including an input coaxial port internal feed and a magnetic coupling ring bending section, one end of the input coaxial port internal feed is connected to one end of the magnetic coupling ring bending section, and the other ends of the input coaxial port internal feed and the magnetic coupling ring bending section are both connected to the embedded disk.

[0014] In some possible implementations, the ratio of the inner and outer feeding diameters of the input coaxial port to the inner and outer feeding diameters of the output port is 1:2.303.

[0015] In some possible implementations, the output coupler is electrically coupled and includes an inner feeding probe, an outer feeding tube and a fixed support plate, and the inner feeding probe is connected to the outer feeding tube via the fixed support plate.

[0016] The present invention adopts the above technical solution, and has the following characteristics: 1. The present invention adopts a double-cut E-bend structure resonant cavity power synthesizer. The RF input port is located on the upper and lower bent end surfaces of the resonant cavity, and the output port is located at the back center of the resonant cavity, which is more conducive to the integration of the front plug-in solid-state power amplifier module inside the cabinet, making the replacement of the solid-state power amplifier module very convenient, and solving the problem of excessive bending moment during plugging and unplugging caused by the need for a coaxial elbow connection in the rectangular resonant cavity.

[0017] 2. The double-cut E-bend structure cavity adopted by the present invention meets the demand for power cavity synthesis output at lower frequencies, solves the problem of rectangular cavity being too large at low frequencies, and adopts a one-stage synthesis method with high synthesis efficiency.

[0018] 3. The input coupler used in the present invention uses the coupling ring as a closed structure and is connected to the external cavity wall in the form of an external flange, so the magnetic coupling effect is better.

[0019] In summary, the method of adjusting the input coupling degree by rotation in the present invention is applicable to the requirements of different levels of output power and can be widely used in power synthesis of solid-state RF power amplifier modules. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Throughout the accompanying drawings, the same reference numerals are used to represent the same components. In the accompanying drawings: Figure 1 It is a schematic diagram of power synthesis when a typical existing rectangular resonant cavity synthesizer is integrated in a cabinet; Figure 2 It is a schematic diagram of the overall structure of an embodiment of the present invention; Figure 3 Schematic diagram of the double-cut E-bend resonant cavity structure according to an embodiment of the present invention; Figure 4 is a schematic structural diagram of an input coupler according to an embodiment of the present invention; Figure 5 is a schematic structural diagram of an output coupler according to an embodiment of the present invention; Figure 6 It is a schematic diagram of S parameters from the output end to each port of the 16-in-1 double-cut-angle E-bend structure cavity power combiner according to an embodiment of the present invention; Figure 7 A schematic diagram of phase shift from the output end to each port of a 16-in-1 double-cut-angle E-bend structure cavity power combiner according to an embodiment of the present invention; Figure 8 Graph showing the transmission coefficient between the input ports of the 16-in-1 double-cut-angle E-bend structure cavity power combiner according to an embodiment of the present invention. DETAILED DESCRIPTION

[0021] It should be understood that the terms used in the text are only for the purpose of describing specific example embodiments, and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" as used in the text may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0022] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0023] For ease of description, spatially relative terms may be used herein to describe the relationship of one element or feature relative to another element or feature as shown in the figures, such as "inside", "outside", "inner side", "outer side", "below", "above", etc. Such spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figures.

[0024] Since the rectangular cavity power synthesizer is synthesized in a standard cabinet, an elbow is required to achieve docking with the power amplifier module. The bending moment at the elbow during the plugging and unplugging process of the power amplifier is often too large to damage the joint, which is not conducive to cabinet integration. The double-cut E-bend cavity power synthesizer provided by the present invention includes: a resonant cavity, the resonant cavity adopts a double-cut E-bend resonant cavity structure, the front end surfaces of the two walls of the double-cut E-bend resonant cavity structure are symmetrically provided with a plurality of first through holes, and the back of the double-cut E-bend resonant cavity structure is provided with a second through hole; an input coupler, the number of which is set to be a plurality of, one end of each input coupler passes through the corresponding first through hole deep into the resonant cavity, and the other end of each input coupler is used as a radio frequency input port for docking with a solid-state power amplifier module; an output coupler, the output coupler is inserted in the second through hole, and the output port of the output coupler is used to connect the load. Therefore, the present invention meets the demand for power cavity synthesis output at a lower frequency, solves the problem that the rectangular cavity is too large at low frequencies, and adopts a one-level synthesis method, with high synthesis efficiency.

[0025] The exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0026] like Figure 2 , Figure 3 As shown, the double-cut E-bend cavity power combiner provided in this embodiment includes a resonant cavity 1, an input coupler 2 and an output coupler 3.

[0027] The resonant cavity 1 adopts a double-cut E-bend resonant cavity structure. A plurality of first through holes 16 are symmetrically arranged on the front ends 11 and 12 of the upper and lower walls of the double-cut E-bend resonant cavity structure. A second through hole 17 is arranged at the back center of the double-cut E-bend resonant cavity structure.

[0028] The number of input couplers 2 is set to be several, one end of each input coupler 2 passes through the corresponding first through hole 16 and extends deep into the resonance cavity 1, and the other end of each input coupler 2 serves as a radio frequency input port 22 for connecting to a solid-state power amplifier module.

[0029] The output coupler 3 is inserted and fixed in the second through hole 17 of the double-cut E-bend resonant cavity structure, and the output port of the output coupler 3 is used to connect to the load.

[0030] In a preferred embodiment of the present invention, Figure 3 As shown, the resonant cavity 1 as a whole presents Glyph, The two bends of the letter "Z" are set as angle-cut bend structures, and the front end surfaces 11 and 12 of the two walls of the resonance cavity 1 are rectangular cross-sections. Except for the bend structure, the other cross-sectional dimensions and areas should be equal.

[0031] Furthermore, each corner bending structure includes three corner cuts, wherein the length direction, i.e., the length1 direction shown in the figure, is the horizontal direction, and the width direction, i.e., the width1 direction shown in the figure, is the vertical direction, and the two are perpendicular. The first corner cut 13 is at an angle of 22.5° to the horizontal direction, the second corner cut 14 is at an angle of 45° to the horizontal direction, and the third corner cut is at an angle of 22.5° to the vertical direction 15, and the side length of the third corner cut 15 is equal to the side length of the first corner cut 13.

[0032] In a preferred embodiment of the present invention, the first through hole 16 is centrally symmetrical about the length direction of the resonant cavity 1 and centrally symmetrical about the width direction of the cavity.

[0033] Furthermore, since the magnetic lines of force on the upper and lower walls are mostly in a horizontal state, the magnetic lines of force near the edge are parallel to the outer edges of the front end surfaces 11 and 12 of the upper and lower walls, the first through hole 16 is arranged at the edge position of the front end surfaces 11 and 12 of the upper and lower walls, such as Figure 2 In this embodiment, the position of the first through hole 16 is width1 / 4-width1 / 5, where width1 is the cross-sectional width of the resonance cavity.

[0034] In a preferred embodiment of the present invention, Figure 4 As shown, the input coupler 2 includes a closed coupling ring 21, an input coaxial port 22, an external flange 23, an embedded disc 24 and a support disc 25. The closed coupling ring 21 is connected to the corresponding first through hole 16 through the embedded disc 24, and the embedded disc 24 is also connected to the outer wall of the resonant cavity 1 through the external flange 23 to ensure good grounding of the closed magnetic coupling ring 21. One end of the support disc 25 is fixedly connected to the embedded disc 24, and the other end of the support disc 25 is connected to the input coaxial port 22, wherein the input coupling degree is adjusted by adjusting the insertion depth and rotation angle of the closed coupling ring 21 inside the resonant cavity 1.

[0035] Furthermore, the support plate 25 may be made of polytetrafluoroethylene.

[0036] Furthermore, the embedded disk 24 is in a ring shape, and the diameter of the embedded disk 24 should match the diameter of the first through hole 16 so that it can be directly embedded in the inside of the first through hole 16 when used.

[0037] Furthermore, the closed coupling ring 21 adopts a "gate" shaped structure, including an input magnetic coupling ring bending section 211 and an input coaxial port internal feed 212. The magnetic coupling ring bending section 211 and the input coaxial port internal feed 212 both adopt a circular ring structure. One end of the input coaxial port internal feed 212 is connected to one end of the magnetic coupling ring bending section 211, and the other ends of the input coaxial port internal feed 212 and the magnetic coupling ring bending section 211 are both connected to an embedded disk 24, which is convenient for the input coupler 2 to be installed inside the first through hole 16.

[0038] Furthermore, the ratio of the inner and outer feeding diameters of the input coaxial port 22 of the input coupler to the inner and outer feeding diameters of the output port of the output coupler 3 is 1:2.303.

[0039] In a preferred embodiment of the present invention, the output coupler 3 is electrically coupled, and includes an inner feeding probe 31, an outer feeding tube 32 and a fixed supporting polytetrafluoroethylene disk 33. The outer feeding tube 32 is connected to the inner feeding probe 31 through the fixed supporting polytetrafluoroethylene 33 to form a coaxial output structure.

[0040] The application of the double-cut-angle E-bend cavity power combiner that is easy to integrate into a cabinet of the present invention is described in detail below through specific embodiments.

[0041] like Figures 2 to 5 As shown, this embodiment is a 325MHz double-cut E-bend cavity power combiner with 16 channels into 1 channel, wherein the length of the resonant cavity 1 is length1=900 mm, the width is width1=490 mm, and the overall height is height1=226 mm; 16 input couplers 2 are fixedly arranged in front of the upper and lower wall ends 11, 12 of the resonant cavity 1 and are symmetrically distributed, with a cross-sectional width width2=160 mm. In order to better adjust the input coupling degree, the distance between the input coupler 2 and the upper arm is width2 / 5=32 mm, and the center distance between adjacent input couplers 2 is 98.8 mm.

[0042] like Figure 2 The structure diagram of the input coupler 2 is shown. The input coaxial port 22 of the input coupler adopts a standard 1_5 / 8 inch RF input port interface, and the input adopts 50Ω characteristic impedance matching. The coupling degree of the input coupler 2 is adjusted by adjusting the insertion depth of the input coupler bending section 212, and the magnetic coupling amount is adjusted by rotating each input coupler 2, so that the coupling degree of all input couplers 2 remains consistent.

[0043] This embodiment uses simulation software to perform simulation, and the output ends are matched by adjusting the coupling degree of the input coupler 2 and the output coupler 3 .

[0044] like Figure 6 As shown, it is the S parameters from the output end to each port of the 16-in-1 double-cut corner E-bend cavity power combiner. It can be seen from the figure that the reflection at the output end is almost 0, which can be considered to be well matched. The difference in the transmission coefficient from each input end to the output end is very small, indicating that the consistency of the 16 input couplers 2 is good.

[0045] like Figure 7 As shown, this is the phase shift from the output end to each port of the 16-in-1 double-cut corner E-bend cavity power combiner. It can be seen that the phase drift from the input end to the output end is almost consistent, indicating that the input ends of the rectangular cavity power combiner have good phase consistency.

[0046] like Figure 8 As shown, the transmission coefficient between the input ends of the 16-in-1 325MHz double-cut corner E-bend cavity power combiner is close to the transmission coefficient between the input couplers of an ideal combiner -24.08 dB, indicating that the adjacent path coupling transconductance effect between the input couplers is very small.

[0047] It can be seen from the above data that the double-cut E-bend cavity power combiner of the present invention has very good performance: 1) It has good amplitude and phase transmission consistency, good output matching, high synthesis efficiency, and small adjacent channel coupling; 2) The number of input couplers 2 can be determined according to actual needs, and the power capacity of the rectangular cavity power combiner of the present invention can be very large; 3) It overcomes the problem of excessive bending moment at the interface when the power amplifier module is plugged in and out when the rectangular synthesizer is integrated in the cabinet, making the synthesizer more reliable; 4) The disadvantage that the rectangular cavity is too large at a lower frequency and is not conducive to integration inside a cabinet is solved. This embodiment is a cavity synthesizer at a frequency of 325 MHz, and the size of the rectangular cavity is greatly reduced compared to that of the rectangular cavity. 5) The method of adjusting the input coupling degree by rotation in the present invention is applicable to requirements of different levels of output power.

[0048] Each embodiment in this specification is described in a progressive manner, and the same and similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In the description of this specification, the description of reference terms "a preferred embodiment", "further", "specifically", "in the present embodiment", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of this specification. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples without contradiction.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A double-cut E-bend cavity power combiner, characterized in that: The power combiner includes: A resonant cavity, wherein the resonant cavity adopts a double-cut-angle E-bend resonant cavity structure, a plurality of first through holes are symmetrically arranged on the front end surfaces of two walls of the double-cut-angle E-bend resonant cavity structure, and a second through hole is arranged on the back of the double-cut-angle E-bend resonant cavity structure; Input couplers, the number of which is set to be several, one end of each of the input couplers passes through the corresponding first through hole and extends deep into the resonant cavity, and the other end of each of the input couplers serves as a radio frequency input port for connecting to a solid-state power amplifier module; An output coupler is inserted into the second through hole, and an output port of the output coupler is used to connect to a load.

2. The double-cut E-bend cavity power combiner according to claim 1, characterized in that: The resonant cavity exhibits Glyph, The two bends of the font are configured as angle-cut bend structures. The front end surfaces of the two walls of the character are arranged to be rectangular cross sections.

3. The double-cut E-bend cavity power combiner according to claim 2, characterized in that: Each of the angled bending structures includes three angles, the first angle is 22.5° with the horizontal direction, the second angle is 45° with the horizontal direction, and the third angle is 22.5° with the vertical direction, wherein the side length of the third angle is equal to the side length of the first angle.

4. The double-cut E-bend cavity power combiner according to claim 3, characterized in that: The first through hole is centrally symmetrical with respect to the length direction and the width direction of the resonant cavity, and the first through hole is arranged at the edge positions of the front end surfaces of the two walls of the cut-angle bending structure.

5. The double-cut E-bend cavity power combiner according to claim 1, characterized in that: The input coupler comprises a closed coupling ring, an input coaxial port, an embedded disc and a support disc; The closed coupling ring is connected to the corresponding first through hole through the embedded disk, and the embedded disk is also connected to the outer wall of the resonant cavity through an external flange disk to ensure good grounding of the closed magnetic coupling ring; one end of the support disk is fixedly connected to the embedded disk, and the other end of the support disk is connected to the input coaxial port, wherein the input coupling degree is adjusted by adjusting the insertion depth and rotation angle of the closed coupling ring inside the resonant cavity.

6. The double-cut-angle E-bend cavity power combiner according to claim 5, characterized in that: The input coaxial port adopts a standard 1_5 / 8 inch RF input port interface, and the input adopts 50Ω characteristic impedance matching.

7. The double-cut-angle E-bend cavity power combiner according to claim 5, characterized in that: The embedded circular disk is in the shape of a ring, and the diameter of the embedded circular disk should match the diameter of the first through hole so that the embedded circular disk can be directly embedded in the first through hole.

8. The double-cut-angle E-bend cavity power combiner according to claim 5, characterized in that: The closed coupling ring adopts a "gate" shaped structure, including an input coaxial port internal feed and a magnetic coupling ring bending section, one end of the input coaxial port internal feed is connected to one end of the magnetic coupling ring bending section, and the other ends of the input coaxial port internal feed and the magnetic coupling ring bending section are both connected to the embedded disk.

9. The double-cut E-bend cavity power combiner according to claim 5, characterized in that: The ratio of the inner and outer feeding diameters of the input coaxial port to the inner and outer feeding diameters of the output port is 1:2.

303.

10. The double-cut E-bend cavity power combiner according to claim 1, characterized in that: The output coupler is electrically coupled and includes an inner feeding probe, an outer feeding tube and a fixed support plate. The inner feeding probe is connected to the outer feeding tube through the fixed support plate.

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