Frequency-adjustable coaxial multi-injection resonant cavity and control method thereof

Abstract

The present application relates to the technical field of high power microwave device, aiming at solving the problem that the prior art cannot avoid the generation of hybrid mode and be applicable to high frequency band, and finally change the frequency of coaxial multi-injection resonant cavity, providing a frequency adjustable coaxial multi-injection resonant cavity and a control method thereof, comprising a double-entry coaxial resonant cavity; the double-entry coaxial resonant cavity is internally provided with a frequency adjusting rod, an annular resonant cavity, a frequency adjusting ring piece, a tray, a frequency adjusting bolt and a frequency adjusting nut, and the frequency adjusting rod and the double-entry coaxial resonant cavity are an integral structure; rotating the frequency adjusting bolt drives the tray to move along the axial direction, drives the frequency adjusting ring piece to move along the axial direction in the annular resonant cavity, and then changes the volume of the annular resonant cavity, the inductance and the frequency of the coaxial multi-injection resonant cavity. The present application has the beneficial effects that the volume of the annular resonant cavity can be changed, the inductance can be changed, the generation of hybrid mode can be avoided, the high frequency band can be applied, and finally the frequency of the coaxial multi-injection resonant cavity can be changed.

Description

Technical Field

[0001] This invention relates to the field of high-power microwave device technology, and more specifically, to a frequency-tunable coaxial multi-beam resonator and its control method. Background Technology

[0002] Multi-beam klystrons employ multi-electron-beam technology, resulting in smaller beam currents for each electron beam and thus higher focusing efficiency. They are characterized by high power and high efficiency, and have been widely used in radar, communications, linear accelerators, and other fields. With the development of national defense, to improve the anti-jamming capabilities of radar systems, ground-based, shipborne, and airborne early warning and guidance radars require multi-beam klystrons to have wide bandwidths; the bandwidth of a multi-beam klystron depends on the bandwidth of its focusing and output sections.

[0003] For the clustering section, staggered tuning techniques can be used to select a suitable resonant cavity frequency distribution to broaden the bandwidth. The bandwidth of the output section mainly depends on the output gap-frequency characteristics, which can be broadened by: 1. Using a filter loading circuit to change the impedance-frequency characteristics of the output cavity, maximizing the impedance-bandwidth product within the operating frequency band; 2. Using a distributed output circuit to increase the equivalent characteristic impedance of the resonant cavity and reduce the appearance quality factor; 3. Using a traveling wave output circuit. Alternatively, the bandwidth of the klystron can be broadened by mechanically changing the resonant frequencies of the clustering and output sections.

[0004] There are three types of resonant mechanical tuning: 1. Capacitor tuning, 2. Inductor tuning, and 3. Composite tuning. Capacitor tuning involves placing a tuning capacitor near the cavity gap to change the gap capacitance and thus the resonant frequency. However, the introduction of the tuning capacitor affects the electric field distribution at the cavity gap, altering the characteristic impedance and generating unwanted modes. If the unwanted mode spectrum is close to the operating frequency, it will affect the normal operation of the klystron. Inductor tuning involves moving the inductor tuning block inside the cavity to change the cavity volume and inductance, thereby changing the resonant frequency. However, there are currently no detailed adjustment methods. Composite tuning changes both the capacitance and inductance of the resonant cavity simultaneously. This method is only suitable for low-frequency klystrons. Therefore, there is an urgent need for a method that can avoid the generation of unwanted modes, be applicable to high-frequency bands, and ultimately change the frequency of a coaxial multi-beam resonant cavity. Summary of the Invention

[0005] The present invention aims to provide a frequency-tunable coaxial multi-beam resonator and its control method to solve the problem that there is no similar device in the prior art that can both avoid the generation of spurious modes and be applicable to the high-frequency band, and ultimately change the frequency of the coaxial multi-beam resonator.

[0006] The embodiments of the present invention are implemented as follows:

[0007] This invention provides a frequency-tunable coaxial multi-beam resonator, which includes a dual-entry coaxial resonator;

[0008] The frequency adjustment rod is provided at the transverse axis of the aforementioned dual-entry coaxial resonant cavity, and the frequency adjustment rod and the aforementioned dual-entry coaxial resonant cavity are an integral structure.

[0009] The aforementioned dual-entry coaxial resonant cavity has a ring resonant cavity inside, and the aforementioned ring resonant cavity is coaxial with the aforementioned frequency adjustment rod;

[0010] The inner wall of the aforementioned annular resonant cavity is fitted with a frequency adjustment ring. A plurality of fixing rods are provided on one side of the frequency adjustment ring, evenly distributed on the ring. The outer ends of the fixing rods penetrate the cavity wall along the axial direction of the frequency adjustment rods. A tray is connected to the outer ends of the fixing rods by frequency adjustment bolts. The tray is coaxial with the frequency adjustment rods. A frequency adjustment bolt is provided on the outer side of the tray, connected to the frequency adjustment rod via an internal thread. A frequency adjustment nut is provided on the inner side of the tray, with the frequency adjustment bolt fixedly connected to the nut via an external thread. The tray is movably clamped between the frequency adjustment bolt and the frequency adjustment nut.

[0011] The frequency-adjustable coaxial multi-beam resonator disclosed in this embodiment has the following advantages: It incorporates the aforementioned frequency adjustment rod, frequency adjustment ring, frequency adjustment bolt, frequency adjustment nut, and tray within a double-entry coaxial resonator. By rotating the frequency adjustment bolt, the tray can be moved axially, which in turn moves the frequency adjustment ring axially within the annular resonator, thereby changing the volume and inductance of the annular resonator and ultimately altering the frequency of the coaxial multi-beam resonator. This results in a frequency-adjustable coaxial multi-beam resonator that can change the volume and inductance of the annular resonator, avoid the generation of spurious modes, be applicable to high-frequency bands, and ultimately change the frequency of the coaxial multi-beam resonator.

[0012] Optionally: The above-mentioned double-entry coaxial resonant cavity is cut into a first part and a second part along the vertical axis. The interior of the first part and the second part are respectively provided with the frequency adjustment rod, the frequency adjustment ring, the frequency adjustment bolt, the frequency adjustment nut and the tray. The flanges corresponding to the first part and the second part are provided with a plurality of screw holes and a plurality of pin holes, and the plurality of screw holes and the plurality of pin holes are uniformly distributed.

[0013] With this configuration, several of the aforementioned screw holes are used for assembly, and several of the aforementioned pin holes are used for alignment, effectively achieving precise docking between the aforementioned first part and the aforementioned second part.

[0014] Optionally, the flange of the second part described above is provided with an annular sealing groove, and an elastic sealing ring is embedded inside the annular sealing groove.

[0015] This configuration effectively ensures that the aforementioned annular resonant cavity operates under a vacuum, providing a sealing effect.

[0016] Optionally: A plurality of first holes are provided on the outer wall of the aforementioned annular resonant cavity, and the plurality of the aforementioned first holes correspond to the plurality of the aforementioned fixing rods;

[0017] The diameter of some of the aforementioned first holes is slightly larger than the diameter of some of the aforementioned fixing rods;

[0018] The outer ends of several fixing rods on the frequency adjustment ring pass through several first holes and are fixedly connected to the tray.

[0019] This configuration ensures that the aforementioned fixing rods on the frequency adjustment ring pass through the aforementioned first holes.

[0020] Optionally, the outer radius of the frequency adjustment ring is slightly smaller than the radius of the corresponding contact surface of the annular resonant cavity, and the inner radius of the frequency adjustment ring is slightly larger than the radius of the corresponding contact surface of the annular resonant cavity.

[0021] This configuration effectively avoids the problem of the frequency adjustment ring having an excessively small inner radius and an excessively large outer radius due to processing errors, which would prevent the frequency adjustment ring from moving continuously axially within the annular resonant cavity. Therefore, this configuration facilitates continuous and precise adjustment of the frequency of the coaxial resonant cavity.

[0022] Optionally, some of the aforementioned fixing rods have threads at their outer ends, and some of the aforementioned fixing rods have unthreaded inner ends with a rod length less than half the length of the aforementioned annular resonant cavity.

[0023] This configuration effectively controls the movement distance of the frequency adjustment ring, avoiding the contact points between the frequency adjustment rings in the first and second parts, and further enabling the coaxial multi-beam resonator to achieve frequency adjustment.

[0024] Optionally, the tray is provided with a plurality of second holes near the outer edge, the plurality of second holes corresponding to the outer ends of the plurality of fixing rods, and the diameter of the plurality of second holes is slightly larger than the threaded section of the outer end of the plurality of fixing rods, but smaller than the unthreaded section of the inner end of the plurality of fixing rods.

[0025] This configuration effectively fixes and confines the tray to the threaded section at the outer end of the fixing rod, which facilitates the movement of the frequency adjustment ring.

[0026] Optionally: the tray surface has angular scale lines, the frequency adjustment bolt surface has a center line groove, and the center line groove can be rotatably aligned with any scale line.

[0027] With this configuration, by comparing the relative positions of the scale lines and the center line grooves, the rotation angle of the frequency adjustment bolt can be precisely controlled, thereby precisely controlling the axial movement distance of the frequency adjustment ring within the annular resonant cavity, and thus continuously changing the frequency of the coaxial resonant cavity.

[0028] Optionally, the materials of the above-mentioned double-entry coaxial resonant cavity, the above-mentioned frequency adjustment rod, the above-mentioned frequency adjustment bolt and the above-mentioned frequency adjustment nut are stainless steel; the material of the above-mentioned frequency adjustment ring is copper; and the material of the above-mentioned tray is hard aluminum.

[0029] With this configuration, stainless steel has a high breakdown threshold, good conductivity, and high strength, which can meet the electromagnetic characteristics and strength requirements of frequency-adjustable coaxial multi-beam resonators in high-power klystron amplifiers; copper has good conductivity to ensure good conductivity between the aforementioned adjustment ring and the aforementioned ring resonator; and hard aluminum is whitish in color, and the contrast is obvious after the scale is colored, making it easy to read the rotation angle of the frequency adjustment bolt or frequency adjustment nut.

[0030] In one embodiment of this invention, a control method for a frequency-adjustable coaxial multi-beam resonant cavity is also provided. By rotating the frequency adjustment bolt, the tray can be moved axially, which in turn moves the frequency adjustment ring axially within the annular resonant cavity, thereby changing the volume of the annular resonant cavity, changing the inductance, and ultimately changing the frequency of the coaxial multi-beam resonant cavity. By comparing the relative positions of the scale lines and the center line groove, the rotation angle of the frequency adjustment bolt can be precisely controlled, and the axial movement distance of the frequency adjustment ring within the annular resonant cavity can be precisely controlled, thereby enabling continuous adjustment of the frequency of the coaxial resonant cavity.

[0031] In summary, the frequency-adjustable coaxial multi-beam resonator and its control method disclosed in this invention can change the volume of the ring resonator, change the inductance, avoid the generation of spurious modes, and be applicable to the high-frequency band, ultimately changing the frequency of the coaxial multi-beam resonator. Attached Figure Description

[0032] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a schematic diagram of the overall structure of a frequency-tunable coaxial multi-beam resonator in an embodiment of the present invention;

[0034] Figure 2 This is a schematic diagram of the structure of the dual-entry coaxial resonant cavity in an embodiment of the present invention;

[0035] Figure 3 As described in the embodiments of the present invention Figure 2 A cross-sectional view along the AA direction;

[0036] Figure 4 This is a front view of the frequency adjustment ring in an embodiment of the present invention;

[0037] Figure 5 This is a side view of the frequency adjustment ring in an embodiment of the present invention;

[0038] Figure 6 This is a front view of the tray in an embodiment of the present invention;

[0039] Figure 7 This is a schematic diagram of the frequency adjustment bolt in an embodiment of the present invention;

[0040] Figure 8 This is a cross-sectional view of the frequency adjustment bolt in an embodiment of the present invention;

[0041] Figure 9 This is a cross-sectional view of the frequency adjusting nut in an embodiment of the present invention.

[0042] Icons: 1-Double-entry coaxial resonant cavity, 2-Frequency adjustment rod, 3-Ring resonant cavity, 4-Frequency adjustment ring, 5-Fixing rod, 6-Tray, 7-Frequency adjustment bolt, 8-Frequency adjustment nut, 9-First part, 10-Second part, 11-Screw hole, 12-Pin hole, 13-Ring sealing groove, 14-Elastic sealing ring, 15-First hole, 16-Second hole, 17-Scale line, 18-Center line groove, 19-Multi-beam electron beam channel, 20-Inner cavity of double-entry resonant cavity, 21-Gap of double-entry resonant cavity, 22-Outer cavity of double-entry resonant cavity. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0044] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0045] Example

[0046] See Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 and Figure 9 This embodiment proposes a frequency-tunable coaxial multi-beam resonator, including a dual-entry coaxial resonator 1;

[0047] A frequency adjustment rod 2 is provided at the transverse axis of the double-entry coaxial resonant cavity 1, and the frequency adjustment rod 2 and the double-entry coaxial resonant cavity 1 are an integral structure.

[0048] The double-entry coaxial resonant cavity 1 has a ring resonant cavity 3 inside, and the ring resonant cavity 3 is coaxial with the frequency adjustment rod 2;

[0049] A frequency adjustment ring 4 is sleeved on the inner wall of the annular resonant cavity 3. Several fixing rods 5 are provided on one side of the frequency adjustment ring 4. The fixing rods 5 are evenly distributed on the frequency adjustment ring 4. The outer ends of the fixing rods 5 penetrate the cavity wall of the annular resonant cavity 3 along the axial direction of the frequency adjustment rod 2. The outer ends of the fixing rods 5 are connected to a tray 6 by frequency adjustment bolts 7. The tray 6 is coaxial with the frequency adjustment rod 2. The outer side of the tray 6 is provided with frequency adjustment bolts 7. The frequency adjustment bolts 7 are connected to the frequency adjustment rod 2 by internal threads. The inner side of the tray 6 is provided with frequency adjustment nuts 8. The frequency adjustment bolts 7 are fixedly connected to the frequency adjustment nuts 8 by external threads. Furthermore, the tray 6 is movably clamped between the frequency adjustment bolts 7 and the frequency adjustment nuts 8.

[0050] This embodiment discloses a frequency-adjustable coaxial multi-beam resonator. Within the double-entry coaxial resonator 1, a frequency adjustment rod 2, a frequency adjustment ring 4, a frequency adjustment bolt 7, a frequency adjustment nut 8, and a tray 6 are installed. By rotating the frequency adjustment bolt, the tray 6 can be moved axially, which in turn moves the frequency adjustment ring 4 axially within the annular resonator 3. This changes the volume of the annular resonator 3, alters the inductance, and ultimately changes the frequency of the coaxial multi-beam resonator. Therefore, this frequency-adjustable coaxial multi-beam resonator offers the advantages of changing the volume of the annular resonator 3, altering the inductance, avoiding the generation of spurious modes, being applicable to high-frequency bands, and ultimately changing the frequency of the coaxial multi-beam resonator.

[0051] See Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 and Figure 9 The double-entry coaxial resonant cavity 1 is cut into a first part 9 and a second part 10 along the vertical axis. The first part 9 and the second part 10 each have a frequency adjustment rod 2, a frequency adjustment ring 4, a frequency adjustment bolt 7, a frequency adjustment nut 8 and a tray 6 inside. The flanges of the first part 9 and the second part 10 are provided with a number of screw holes 11 and a number of pin holes 12. The screw holes 11 and the pin holes 12 are evenly distributed. The screw holes 11 are used for assembly and the pin holes 12 are used for centering, which effectively realizes the precise docking of the first part 9 and the second part 10.

[0052] The flange of the second part 10 is provided with an annular sealing groove 13, and an elastic sealing ring 14 is embedded in the annular sealing groove 13. This effectively ensures that the annular resonant cavity 3 is in a vacuum state when it is working, and has a sealing effect.

[0053] See Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 and Figure 9 A plurality of first holes 15 are provided on the outer wall of the ring resonant cavity 3, and the plurality of first holes 15 correspond to a plurality of fixed rods 5; the diameter of the plurality of first holes 15 is slightly larger than the diameter of the plurality of fixed rods 5; the outer ends of the plurality of fixed rods 5 on the frequency adjustment ring 4 pass through the plurality of first holes 15 and are fixedly connected to the tray 6, so as to ensure that the plurality of fixed rods 5 on the frequency adjustment ring 4 pass through the plurality of first holes 15.

[0054] The outer radius of the frequency adjustment ring 4 is slightly smaller than the radius of the corresponding contact surface of the annular resonant cavity 3, and the inner radius of the frequency adjustment ring 4 is slightly larger than the radius of the corresponding contact surface of the annular resonant cavity 3. This effectively avoids the inner radius of the frequency adjustment ring 4 being too small and the outer radius being too large due to processing errors, which would prevent the frequency adjustment ring 4 from moving axially continuously within the annular resonant cavity 3. Therefore, this setting is conducive to continuous and precise adjustment of the frequency of the coaxial resonant cavity.

[0055] The outer ends of several fixed rods 5 are threaded, and the inner ends of several fixed rods 5 are unthreaded. The rod length is less than half the length of the annular resonant cavity 3, which effectively controls the movement distance of the frequency adjustment ring 4 and avoids the contact between the frequency adjustment rings 4 in the first part 9 and the second part 10, further enabling the coaxial multi-beam resonant cavity to achieve frequency adjustment.

[0056] The tray 6 has several second holes 16 near its outer edge. These second holes 16 correspond to the outer ends of several fixing rods 5. The diameter of the second holes 16 is slightly larger than the threaded section of the outer end of the fixing rods 5, but smaller than the unthreaded section of the inner end of the fixing rods 5. This effectively fixes and restricts the tray 6 to the threaded section of the outer end of the fixing rods 5, which is beneficial for the movement of the frequency adjustment ring 4.

[0057] The surface of the tray 6 has angular scale lines 17, and the surface of the frequency adjustment bolt 7 has a center line groove 18. The center line groove 18 can be rotated to correspond to any scale line 17. By comparing the relative positions of the scale line 17 and the center line groove 18, the rotation angle of the frequency adjustment bolt 7 can be precisely controlled, thereby precisely controlling the axial movement distance of the frequency adjustment ring 4 within the annular resonant cavity 3, and thus continuously changing the frequency of the coaxial resonant cavity.

[0058] The double-entry coaxial resonator 1, frequency adjustment rod 2, frequency adjustment bolt 7, and frequency adjustment nut 8 are made of stainless steel; the frequency adjustment ring 4 is made of copper; and the tray 6 is made of hard aluminum. The stainless steel materials of the double-entry coaxial resonator 1, frequency adjustment rod 2, frequency adjustment bolt 7, and frequency adjustment nut 8 ensure the electromagnetic characteristics and strength requirements of the frequency-adjustable coaxial multi-beam resonator when applied to high-power klystron amplifiers. The copper material of the frequency adjustment ring 4 ensures good conductivity between the frequency adjustment ring 4 and the ring resonator 3. The hard aluminum material of the tray 6 facilitates the comparison between the center line groove 18 and the scale line 17, making it easy to read the rotation angle of the frequency adjustment bolt 7 or the frequency adjustment nut 8.

[0059] See Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 and Figure 9 In this embodiment, the dual-entry coaxial resonant cavity 1 also has a multi-beam electron beam channel 19, an inner cavity 20 of the dual-entry resonant cavity, a gap 21 of the dual-entry resonant cavity, and an outer cavity 22 of the dual-entry resonant cavity. The multi-beam electron beam channel 19, the inner cavity 20 of the dual-entry resonant cavity, the gap 21 of the dual-entry resonant cavity, and the outer cavity 22 of the dual-entry resonant cavity are all symmetrically distributed along the frequency adjustment rod 2.

[0060] See Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 and Figure 9 In this embodiment, the outer radius and inner radius of the sealing groove of the dual-entry coaxial resonant cavity 1 are 79mm and 75.5mm respectively, and the depth is 2.9mm; there are two pin holes 12 with a radius of 5mm, and the radius from the center of the pin hole 12 to the center of the cross-section of the first part 9 and the second part 10 is 84.25mm; there are twelve screw holes 11 with a radius of 6.5mm, and the radius from the center of the screw hole 11 to the center of the cross-section of the first part 9 and the second part 10 is 84.25mm; the radius of the multi-beam electron beam channel 19 is 8.5mm, and the radius from the center of the multi-beam electron beam channel 19 to the center of the cross-section of the first part 9 and the second part 10 is 84.25mm; The radius of the center of the cross-section of part 10 is 42.5 mm; the outer radius and inner radius of the inner cavity 20 of the double-entry resonant cavity are 31.5 mm and 23.5 mm, respectively, and the axial length of the inner cavity 20 of the double-entry resonant cavity is 41 mm; the outer radius and inner radius of the gap 21 of the double-entry resonant cavity are 53.5 mm and 31.5 mm, respectively, and the axial length of the gap 21 of the double-entry resonant cavity is 16 mm; the outer radius and inner radius of the outer cavity 22 of the double-entry resonant cavity are 75.5 mm and 53.5 mm, respectively, and the axial length of the outer cavity 22 of the double-entry resonant cavity is 32.1 mm.

[0061] The frequency adjustment rod 2 has a length of 45mm, a screw radius of 2.5mm, and a thread pitch of 0.5mm.

[0062] The outer radius and inner radius of the frequency adjustment ring 4 are 63mm and 47mm respectively. Four fixing rods 5 are evenly distributed on the upper corner of the frequency adjustment ring 4. The total length of the fixing rods 5 is 24mm. The length and radius of the rods without threads are 14mm and 2.5mm respectively, and the length and radius of the rods with threads are 8mm and 3mm respectively.

[0063] The length and radius of the external thread of the frequency adjusting bolt 7 are 5.7 mm and 5.5 mm, respectively, and the total length and radius of the internal thread of the frequency adjusting bolt 7 are 19 mm and 2.5 mm, respectively.

[0064] The total length and radius of the internal thread of the frequency adjusting nut 8 are 6mm and 5.5mm, respectively.

[0065] The outer and inner radii of the tray 6 are 31.5 mm and 9 mm respectively, and the thickness is 4 mm. Four second holes 16 are evenly distributed in the angular direction. The radius of the second hole 16 is 1.8 mm. The angular scale is engraved on the ring surface of the tray 6, and the minimum scale value is 2 degrees.

[0066] See Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 and Figure 9 In one embodiment of this invention, a control method for a frequency-tunable coaxial multi-beam resonator is also provided.

[0067] Rotating the frequency adjustment bolt moves the tray 6 axially, which in turn moves the frequency adjustment ring 4 axially within the annular resonant cavity 3, thereby changing the volume of the annular resonant cavity 3, changing the inductance, and ultimately changing the frequency of the coaxial multi-beam resonant cavity. By comparing the relative positions of the scale line 17 and the center line groove 18, the rotation angle of the frequency adjustment bolt 7 can be precisely controlled, as can the axial movement distance of the frequency adjustment ring 4 within the annular resonant cavity 3, thus enabling continuous adjustment of the frequency of the coaxial resonant cavity.

[0068] In this embodiment, the cutting surfaces of the first part 9 and the second part 10 are... Figure 3 A sectional view, which is Figure 2 A cross-sectional view along the AA direction.

[0069] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A frequency-tunable coaxial multi-beam resonator, characterized in that: Including dual-entry coaxial resonator; The dual-entry coaxial resonant cavity has a frequency adjustment rod at its transverse axis, and the frequency adjustment rod and the dual-entry coaxial resonant cavity are an integral structure. The dual-entry coaxial resonant cavity has an internal annular resonant cavity, and the annular resonant cavity is coaxial with the frequency adjustment rod. A frequency adjustment ring is sleeved on the inner wall of the annular resonant cavity. Several fixing rods are provided on one side of the frequency adjustment ring, evenly distributed on the ring. The outer ends of the fixing rods penetrate the cavity wall along the axial direction of the frequency adjustment rods. A tray is connected to the outer end of each fixing rod by a frequency adjustment bolt. The tray is coaxial with the frequency adjustment rod. A frequency adjustment bolt is provided on the outer side of the tray, connected to the frequency adjustment rod via an internal thread. A frequency adjustment nut is provided on the inner side of the tray, and the frequency adjustment bolt is fixedly connected to the frequency adjustment nut via an external thread. The tray is movably clamped between the frequency adjustment bolt and the frequency adjustment nut. The dual-entry coaxial resonant cavity is cut into a first part and a second part along the vertical axis. The first part and the second part each have the frequency adjustment rod, the frequency adjustment ring, the frequency adjustment bolt, the frequency adjustment nut and the tray inside. The flanges corresponding to the first part and the second part are provided with a number of screw holes and a number of pin holes, and the number of screw holes and pin holes are evenly distributed. The tray surface is provided with angular scale lines, and the frequency adjustment bolt surface has a center line groove, which can be rotated to correspond to any scale line.

2. The frequency-tunable coaxial multi-beam resonator according to claim 1, characterized in that: The flange of the second part is provided with an annular sealing groove, and an elastic sealing ring is embedded inside the annular sealing groove.

3. The frequency-tunable coaxial multi-beam resonator according to claim 1, characterized in that: The outer wall of the annular resonant cavity is provided with a plurality of first holes, and the plurality of first holes correspond to a plurality of fixed rods; The diameter of some of the first holes is slightly larger than the diameter of some of the fixing rods; The outer ends of several fixing rods on the frequency adjustment ring pass through several first holes and are fixedly connected to the tray.

4. The frequency-tunable coaxial multi-beam resonator according to claim 1, characterized in that: The outer radius of the frequency adjustment ring is slightly smaller than the radius of the corresponding contact surface of the annular resonant cavity, and the inner radius of the frequency adjustment ring is slightly larger than the radius of the corresponding contact surface of the annular resonant cavity.

5. The frequency-tunable coaxial multi-beam resonator according to claim 1, characterized in that: The outer ends of some of the fixed rods are threaded, and the inner ends of some of the fixed rods are unthreaded, with a rod length less than half the length of the annular resonant cavity.

6. The frequency-tunable coaxial multi-beam resonator according to claim 1, characterized in that: The tray has several second holes near its outer edge, which correspond to the outer ends of several fixing rods. The diameter of the several second holes is slightly larger than the threaded section of the outer end of several fixing rods, but smaller than the unthreaded section of the inner end of several fixing rods.

7. The frequency-tunable coaxial multi-beam resonator according to claim 1, characterized in that: The double-entry coaxial resonant cavity, the frequency adjustment rod, the frequency adjustment bolt, and the frequency adjustment nut are made of stainless steel; the frequency adjustment ring is made of copper; and the tray is made of hard aluminum.

8. A control method for a frequency-tunable coaxial multi-beam resonator according to any one of claims 1 to 7, characterized in that: By rotating the frequency adjustment bolt, the tray can be moved axially, which in turn moves the frequency adjustment ring axially within the annular resonant cavity, thereby changing the volume of the annular resonant cavity, changing the inductance, and ultimately changing the frequency of the coaxial multi-beam resonant cavity. By comparing the relative positions of the scale lines and the center line groove, the rotation angle of the frequency adjustment bolt can be precisely controlled, as can the axial movement distance of the frequency adjustment ring within the annular resonant cavity, thus enabling continuous adjustment of the frequency of the coaxial resonant cavity.

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