Continuous wave magnetron cathode assembly capable of suppressing microwave leakage

Abstract

The utility model discloses a continuous wave magnetron cathode assembly capable of suppressing microwave leakage, which comprises a cathode porcelain group, a cathode core rod group, a filament cylinder fixed in the cathode porcelain group, and a multistage outer choke group and a multistage inner choke group capable of suppressing leakage of a plurality of microwaves with different frequencies, the multi-stage outer choke group is coaxially arranged between the cathode porcelain group and the filament cylinder, and the multi-stage inner choke group is coaxially arranged between the cathode core rod group and the filament cylinder. According to the utility model, by arranging the multi-stage outer choke group and the multi-stage inner choke group, a plurality of microwaves with different frequencies can be effectively suppressed, a key area of microwave leakage can be covered to the greatest extent, the microwave leakage amount is remarkably reduced, and the problem of multi-frequency microwave leakage of a cathode part of a traditional continuous wave magnetron is fundamentally solved; the interference of microwave leakage on the surrounding environment and equipment is greatly reduced, and the working stability and safety of the continuous wave magnetron are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of magnetrons, in particular to a continuous wave magnetron cathode component capable of suppressing microwave leakage. Background Art

[0002] Continuous-wave magnetrons, as key electronic devices capable of generating microwaves, are widely used in a variety of fields, including radar systems, microwave communications, industrial heating, and microwave plasma chemical vapor deposition systems. However, microwave leakage has been a major factor limiting their performance and safe application.

[0003] Among the various components of a continuous-wave magnetron, microwave leakage from the cathode assembly is particularly problematic. During normal operation, a continuous-wave magnetron generates not only microwaves at the main mode frequency, but also higher-order harmonics and other parasitic frequencies. The design of conventional continuous-wave magnetron cathode assemblies fails to adequately address the suppression of microwave leakage at these multiple frequencies. Furthermore, at the cathode core end, microwaves are susceptible to leakage from the filament and cathode porcelain. Existing cathode assembly structural designs offer relatively limited microwave leakage suppression, typically only providing limited suppression in a specific area and failing to fully and effectively prevent microwave leakage. This microwave leakage not only interferes with the normal operation of other electronic equipment but also poses a potential health threat to operators.

[0004] In summary, the existing continuous wave magnetron cathode assembly has obvious defects in suppressing microwave leakage and cannot meet the current requirements of various fields for high performance and high safety of continuous wave magnetrons. There is an urgent need for a new continuous wave magnetron cathode assembly design to effectively suppress microwave leakage at multiple different frequencies and in different regions, and improve the overall performance and reliability of the continuous wave magnetron. Utility Model Content

[0005] The problem to be solved by the utility model is to provide a continuous wave magnetron cathode assembly capable of suppressing microwave leakage, so as to overcome the defect that the traditional continuous wave magnetron cathode assembly cannot fully and effectively suppress the leakage of multiple microwaves with different frequencies.

[0006] The technical solution adopted by the present invention to solve its technical problems is: a continuous wave magnetron cathode assembly capable of suppressing microwave leakage, comprising: a cathode porcelain group, a cathode core rod group, a filament tube fixed inside the cathode porcelain group, and a multi-stage external choke group and a multi-stage internal choke group, both of which can suppress the leakage of multiple microwaves of different frequencies, the cathode core rod group coaxially passing through the filament tube, the multi-stage external choke group coaxially arranged between the cathode porcelain group and the filament tube, and the multi-stage internal choke group coaxially arranged between the cathode core rod group and the filament tube.

[0007] As a further improvement of the present invention, the multi-stage external choke group and the multi-stage internal choke group each include at least two choke tubes of different lengths, and at least two of the choke tubes are coaxially mounted on each other and spaced apart.

[0008] As a further improvement of the present invention, the cathode porcelain group includes a filament porcelain tube and a cathode porcelain tube coaxially distributed above and below, the multi-stage external choke group is used to suppress the leakage of multiple microwaves of different frequencies from the cathode porcelain tube, and the multi-stage internal choke group is used to suppress the leakage of multiple microwaves of different frequencies from the filament porcelain tube.

[0009] As a further improvement of the present invention, the cathode porcelain group also includes a cathode porcelain sealing ring fixedly connected between the filament porcelain tube and the cathode porcelain tube, a filament base is fixed inside the cathode porcelain sealing ring, and the filament tube is fixed to the filament base.

[0010] As a further improvement of the present invention, the multi-stage external choke group includes two filament chokes of different lengths and coaxially mounted on each other, and the two filament chokes are both fixed to the filament base; the multi-stage internal choke group includes two central chokes of different lengths and coaxially mounted on each other, and the two central chokes are both fixed to the cathode core rod group; one of the filament chokes and one of the central chokes are used to suppress microwave leakage of the main mode frequency of the continuous wave magnetron, and the other filament choke and the other central choke are used to suppress microwave leakage of the parasitic frequency of the continuous wave magnetron.

[0011] As a further improvement of the present invention, the continuous wave magnetron cathode assembly that can suppress microwave leakage also includes a pole shoe, and the cathode porcelain tube is fixedly connected to the top of the pole shoe through a pole shoe sealing ring; the multi-stage external choke group also includes a pole shoe choke tube, and the pole shoe choke tube is fixed to the top of the pole shoe, and the lower ends of the two filament choke tubes extend into the pole shoe choke tube.

[0012] As a further improvement of the present invention, the main mode frequency is 2450 MHz, the longer length of the filament choke, the longer length of the center choke, and the length of the pole shoe choke all fall within the range of 27 mm to 33 mm; the parasitic frequency is 3430 MHz, the shorter length of the filament choke and the shorter length of the center choke all fall within the range of 17 mm to 23 mm.

[0013] As a further improvement of the present invention, the cathode core rod group includes a cathode core rod and a core rod base, the cathode core rod and the multi-stage internal choke group are coaxially fixed to the core rod base, and the multi-stage internal choke group is sleeved on the outside of the cathode core rod.

[0014] As a further improvement of the present invention, the continuous wave magnetron cathode assembly capable of suppressing microwave leakage further includes a support rod base, the support rod base is fixed to the top of the filament porcelain tube, and the core rod base is fixedly connected to the support rod base.

[0015] As a further improvement of the present invention, the multi-stage external choke group and the multi-stage internal choke group are both made of metal.

[0016] The beneficial effects of the present invention are as follows: the present invention provides a continuous wave magnetron cathode assembly that can suppress microwave leakage. By arranging a multi-stage external choke group and a multi-stage internal choke group, it can effectively suppress microwaves of multiple different frequencies. At the same time, the multi-stage external choke group is coaxially arranged between the cathode porcelain group and the filament tube, and the multi-stage internal choke group is coaxially arranged between the cathode core rod group and the filament tube, ensuring that it can cover the key areas of microwave leakage to the maximum extent, significantly reducing the amount of microwave leakage, and fundamentally solving the problem of multi-frequency microwave leakage in the cathode part of the traditional continuous wave magnetron, greatly reducing the interference of microwave leakage on the surrounding environment and equipment, and improving the working stability and safety of the continuous wave magnetron. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0018] Figure 1 This is a three-dimensional diagram of a cathode assembly of a continuous wave magnetron capable of suppressing microwave leakage according to the present invention;

[0019] Figure 2 This is a cross-sectional view of a cathode assembly of a continuous wave magnetron capable of suppressing microwave leakage according to the present invention;

[0020] Figure 3 A three-dimensional diagram of the filament tube, the multi-stage outer choke group, and the multi-stage inner choke group in the present invention;

[0021] Figure 4 It is a cross-sectional view of the filament tube, the multi-stage external choke group and the multi-stage internal choke group in the present invention;

[0022] in, Figure 4 L1~L4 in the figure represent the length of the corresponding choke.

[0023] The following description is made with reference to the accompanying drawings:

[0024] 1. Cathode porcelain group; 11. Filament porcelain tube; 12. Cathode porcelain tube; 13. Cathode porcelain sealing ring; 2. Cathode core rod group; 21. Cathode core rod; 22. Core rod base; 3. Filament tube; 4. Multi-stage external choke group; 41. Filament choke tube; 42. Pole shoe choke tube; 5. Multi-stage internal choke group; 51. Center choke tube; 6. Pole shoe; 7. Pole shoe sealing ring; 8. Support rod base; 9. Filament base. DETAILED DESCRIPTION

[0025] The present application is described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] The following describes the embodiments of the present application through specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The present application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that, in the absence of conflict, the features in the following embodiments and embodiments can be combined with each other. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative work are within the scope of protection of this application.

[0027] It should be noted that various aspects of the embodiments within the scope of the appended claims are described below. It should be apparent that the aspects described herein can be embodied in a wide variety of forms, and any specific structure and / or function described herein is merely illustrative. Based on this application, it should be understood by those skilled in the art that an aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number and aspect described herein can be used to implement an apparatus and / or practice a method. In addition, other structures and / or functionalities other than one or more of the aspects described herein can be used to implement this apparatus and / or practice this method.

[0028] It should also be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present application. The illustrations only show components related to the present application and are not drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component can be changed at will, and the component layout type may also be more complicated.

[0029] Additionally, in the following description, specific details are provided to provide a thorough understanding of the examples, however, one skilled in the art will appreciate that the examples can be practiced without these specific details.

[0030] The following describes the technical solutions provided by various embodiments of the present application in conjunction with the accompanying drawings.

[0031] See Figures 1 to 4 The present invention provides a continuous-wave magnetron cathode assembly capable of suppressing microwave leakage, comprising a cathode porcelain assembly 1, a cathode core rod assembly 2, and a filament tube 3 fixed within the cathode porcelain assembly 1. The filament tube 3 is cylindrical with both ends open, and the cathode core rod assembly 2 is coaxially inserted into the filament tube 3. The filament tube 3 is used in conjunction with the cathode core rod assembly 2 to securely mount the filament assembly in the continuous-wave magnetron cathode assembly.

[0032] Furthermore, the cathode assembly of the continuous wave magnetron capable of suppressing microwave leakage of the present invention further includes a multi-stage external choke group 4 and a multi-stage internal choke group 5, both of which are capable of suppressing leakage of multiple microwaves of different frequencies. The multi-stage external choke group 4 is coaxially arranged between the cathode porcelain group 1 and the filament tube 3, and the multi-stage internal choke group 5 is coaxially arranged between the cathode core rod group 2 and the filament tube 3. By arranging the multi-stage external choke group 4 and the multi-stage internal choke group 5, the present invention can effectively suppress microwaves of multiple frequencies. At the same time, the multi-stage external choke group 4 is coaxially arranged between the cathode porcelain group 1 and the filament tube 3, and the multi-stage internal choke group 5 is coaxially arranged between the cathode core rod group 2 and the filament tube 3, ensuring that they can cover the key areas of microwave leakage to the greatest extent possible, significantly reducing the amount of microwave leakage, and fundamentally solving the problem of multiple-frequency microwave leakage in the cathode part of the traditional continuous wave magnetron, greatly reducing the interference of microwave leakage on the surrounding environment and equipment, and improving the working stability and safety of the continuous wave magnetron.

[0033] In the present invention, the cathode porcelain group 1 includes a filament porcelain tube 11 and a cathode porcelain tube 12 coaxially distributed above and below, and a cathode porcelain sealing ring 13 fixedly connected between the filament porcelain tube 11 and the cathode porcelain tube 12, and a filament base 9 is fixed inside the cathode porcelain sealing ring 13, and the upper end of the filament tube 3 is fixed to the filament base 9.

[0034] The cathode porcelain group 1 in the present invention adopts a filament porcelain tube 11 and a cathode porcelain tube 12 coaxially distributed above and below, and is fixedly connected by a cathode porcelain sealing ring 13. At the same time, the filament tube 3 is fixed to the cathode porcelain sealing ring 13 through the filament base 9. This structural design not only makes the connection between the various components of the cathode assembly more stable, but also can provide the necessary support and electrical insulation for the cathode assembly.

[0035] In the traditional continuous wave magnetron structure, the cathode assembly has a serious microwave leakage problem. Microwaves easily leak out from the filament porcelain tube 11 and the cathode porcelain tube 12 and radiate into the surrounding space. However, the present invention coaxially arranges a multi-stage external choke group 4 between the cathode porcelain group 1 and the filament tube 3, and uses the multi-stage external choke group 4 to suppress the leakage of multiple microwaves of different frequencies from the cathode porcelain tube 12. The multi-stage internal choke group 5 is coaxially arranged between the cathode core rod group 2 and the filament tube 3, and uses the multi-stage internal choke group 5 to suppress the leakage of multiple microwaves of different frequencies from the filament porcelain tube 11. This precise functional zoning makes the effect of suppressing microwave leakage more significant and more targeted, effectively improving the ability of the entire cathode assembly to suppress microwave leakage from different parts.

[0036] See Figure 2 The filament base 9 is annular, its outer ring is welded to the cathode porcelain sealing ring 13, and its inner ring has a convex ring extending axially upward. The cathode core rod group 2 passes through the convex ring of the filament base 9 with a gap between the two. The upper end of the filament tube 3 is welded to the inner wall of the convex ring of the filament base 9.

[0037] The cathode core rod group 2 in the present invention includes a cathode core rod 21 and a core rod base 22. The cathode core rod 21 and the multi-stage internal choke group 5 are coaxially brazed to the bottom of the core rod base 22, and the multi-stage internal choke group 5 is sleeved on the outside of the cathode core rod 21. At the same time, a gap is left between the multi-stage internal choke group 5 and the cathode core rod 21.

[0038] In addition, the continuous wave magnetron cathode assembly capable of suppressing microwave leakage further includes a support rod base 8 , which is fixedly welded to the top of the filament porcelain tube 11 , and the upper end of the core rod base 22 is fixedly welded to the support rod base 8 .

[0039] Furthermore, each of the multi-stage outer choke group 4 and the multi-stage inner choke group 5 includes at least two choke tubes of different lengths, and the at least two choke tubes of each of the multi-stage outer choke group 4 and the multi-stage inner choke group 5 are coaxially mounted and spaced apart. The present invention utilizes choke tubes of different lengths to effectively suppress microwaves of different target frequencies.

[0040] In this embodiment, the chokes are all in the shape of a cylinder with a hollow interior and open ends.

[0041] This embodiment provides a 15kW / 2450MHz continuous wave magnetron. Since it is difficult for an actual continuous wave magnetron structure to be completely ideal and uniform, during normal operation, in addition to the microwaves at the main mode frequency of 2450MHz, microwaves at other frequencies, such as microwaves at 3430MHz, are also generated. These are referred to herein as parasitic frequency microwaves.

[0042] Specifically, if Figure 2As shown, the multi-stage external choke group 4 includes two filament choke tubes 41 of different lengths and coaxially mounted on each other. The upper ends of the two filament choke tubes 41 are fixed to the bottom surface of the filament base 9.

[0043] The multi-stage internal choke group 5 includes two central choke tubes 51 of different lengths and coaxially mounted on each other. The upper ends of the two central choke tubes 51 are fixed to the bottom of the core rod base 22.

[0044] The two filament chokes 41 and the filament base 9 , as well as the two central chokes 51 and the core rod base 22 , are fixed by brazing to ensure a tight welding package to prevent microwave leakage from the gaps.

[0045] Of course, in other embodiments of the present invention, the two filament chokes 41 and the filament base 9 , as well as the two central chokes 51 and the core rod base 22 can also be integrally formed.

[0046] Furthermore, one of the filament chokes 41 and one of the center chokes 51 are used to suppress microwave leakage at the main mode frequency of the continuous wave magnetron, and the other filament choke 41 and the other center choke 51 are used to suppress microwave leakage at the parasitic frequency of the continuous wave magnetron.

[0047] According to electromagnetic principles, when an electromagnetic wave encounters a structure with a depth of λ / 4, a reflected wave is generated. The reflected wave and the incident wave cancel each other out, thereby suppressing the propagation of the electromagnetic wave and achieving the effect of suppressing microwave leakage. Therefore, in this embodiment, the length of the two filament chokes 41 and the two center chokes 51 is set to approximately λ / 4.

[0048] The wavelength λ of microwaves can be calculated by the formula λ=c / f, where c is the speed of light (3×10 8 m / s), and f is the frequency. For example, in this embodiment, the main mode frequency f = 2450 MHz, and λ ≈ 12.24 cm can be calculated; in this embodiment, the parasitic frequency f = 3430 MHz, and λ ≈ 8.75 cm can be calculated.

[0049] like Figure 4 As shown, since the main mode frequency in this embodiment is 2450 MHz, the length of the longer filament choke 41 is set to L3, and 27 mm ≤ L3 ≤ 33 mm; the length of the longer center choke 51 is set to L4, and 27 mm ≤ L4 ≤ 33 mm. Since the parasitic frequency in this embodiment is 3430 MHz, the length of the shorter filament choke 41 is set to L2, and 17 mm ≤ L2 ≤ 23 mm; the length of the shorter center choke 51 is set to L1, and 17 mm ≤ L1 ≤ 23 mm.

[0050] For the two long and short filament choke tubes 41 of the multi-stage external choke group 4, Figure 2 As shown in FIG, the longer filament choke 41 is located on the inner side, and the shorter filament choke 41 is located on the outer side. Of course, the positions of the two filament chokes 41 can also be interchanged to achieve the same effect.

[0051] Similarly, for the two long and short center choke tubes 51 of the multi-stage inner choke group 5, Figure 2 As shown in FIG, the longer central choke 51 is located on the inner side, and the shorter central choke 51 is located on the outer side. Of course, the positions of the two central chokes 51 can also be interchanged to achieve the same effect.

[0052] The utility model can effectively suppress the microwave leakage of the main mode frequency and other parasitic frequencies by precisely designing the size and position of the multi-stage choke, ensuring that it can cover the key areas of microwave leakage to the greatest extent and significantly reduce the amount of microwave leakage.

[0053] See Figure 2 and Figure 3 The continuous wave magnetron cathode assembly capable of suppressing microwave leakage further includes a pole shoe 6 , and a cathode porcelain tube 12 is fixedly welded to the top of the pole shoe 6 through a pole shoe sealing ring 7 .

[0054] Furthermore, the multi-stage external choke group 4 also includes a pole shoe choke 42, which is brazed to the top of the pole shoe 6. The lower ends of the two filament chokes 41 extend into the pole shoe choke 42. In this embodiment, the pole shoe choke 42 is 27 mm to 33 mm long and is used to cooperate with the multi-stage external choke group 4 to suppress the leakage of microwaves of the main mode frequency from the cathode porcelain tube 12.

[0055] It should be noted that this embodiment uses 2450 MHz and 3430 MHz as the target frequencies for microwave suppression. When the target frequencies are different, the length of the choke can be adjusted accordingly. The width of the choke can be adjusted based on actual needs, but it must ensure that it effectively covers the critical areas where microwave leakage occurs.

[0056] In addition, the continuous-wave magnetron cathode assembly, which suppresses microwave leakage, also includes a filament assembly, which is fixed to the cathode core rod 21 and the bottom of the filament tube 3. The filament assembly utilizes existing conventional technology. This utility model does not involve improvements to the structure and working principle of the filament assembly. Due to its conventionality and maturity, it is not shown in the figure, and the specific structure and working principle of the filament assembly will not be elaborated in detail here.

[0057] In this embodiment, both the multi-stage outer choke group 4 and the multi-stage inner choke group 5 are made of a highly conductive metal material, preferably copper. On the one hand, the metal multi-stage outer choke group 4 and the multi-stage inner choke group 5 reflect microwave energy, preventing it from penetrating, thereby effectively suppressing microwave leakage. On the other hand, the reflective and shielding effects of the metal material, created by nesting the pole piece choke 42 and the two filament chokes 41, further reduce microwave leakage.

[0058] Furthermore, the cathode assembly of the continuous-wave magnetron with microwave leakage suppression, which is designed for microwave leakage suppression, was tested using microwave leakage detection equipment to verify its effectiveness in suppressing microwave leakage. The test results demonstrate that the cathode assembly can significantly reduce microwave leakage, reducing it to less than 1% of that of conventional continuous-wave magnetron structures, significantly improving the safety and reliability of the equipment.

[0059] To sum up, the continuous wave magnetron cathode assembly of the utility model can suppress microwave leakage by setting a multi-stage external choke group 4 and a multi-stage internal choke group 5, and can effectively suppress microwaves of multiple different frequencies. At the same time, the multi-stage external choke group 4 is coaxially arranged between the cathode porcelain group 1 and the filament tube 3, and the multi-stage internal choke group 5 is coaxially arranged between the cathode core rod group 2 and the filament tube 3, ensuring that it can cover the key areas of microwave leakage to the maximum extent, significantly reducing the amount of microwave leakage, and fundamentally solving the problem of multi-frequency microwave leakage in the cathode part of the traditional continuous wave magnetron, greatly reducing the interference of microwave leakage on the surrounding environment and equipment, and improving the working stability and safety of the continuous wave magnetron.

[0060] The same or similar parts between the various embodiments in this specification can be referred to each other, and each embodiment focuses on the differences from other embodiments.

[0061] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A continuous wave magnetron cathode assembly capable of suppressing microwave leakage, comprising a cathode porcelain group (1), a cathode core rod group (2), and a filament tube (3) fixed inside the cathode porcelain group (1), wherein the cathode core rod group (2) is coaxially inserted into the filament tube (3), and characterized in that: The invention also includes a multi-stage external choke group (4) and a multi-stage internal choke group (5), both of which can suppress the leakage of multiple microwaves of different frequencies. The multi-stage external choke group (4) is coaxially arranged between the cathode porcelain group (1) and the filament tube (3), and the multi-stage internal choke group (5) is coaxially arranged between the cathode core rod group (2) and the filament tube (3).

2. The continuous wave magnetron cathode assembly capable of suppressing microwave leakage according to claim 1, characterized in that: The multi-stage outer choke group (4) and the multi-stage inner choke group (5) each include at least two choke tubes of different lengths, and at least two of the choke tubes are coaxially mounted on each other and spaced apart.

3. The continuous wave magnetron cathode assembly capable of suppressing microwave leakage according to claim 1, characterized in that: The cathode porcelain group (1) comprises a filament porcelain tube (11) and a cathode porcelain tube (12) coaxially distributed above and below, the multi-stage external choke group (4) is used to suppress leakage of multiple microwaves of different frequencies from the cathode porcelain tube (12), and the multi-stage internal choke group (5) is used to suppress leakage of multiple microwaves of different frequencies from the filament porcelain tube (11).

4. The continuous wave magnetron cathode assembly capable of suppressing microwave leakage according to claim 3, characterized in that: The cathode porcelain assembly (1) further comprises a cathode porcelain sealing ring (13) fixedly connected between the filament porcelain tube (11) and the cathode porcelain tube (12), a filament base (9) being fixed inside the cathode porcelain sealing ring (13), and the filament tube (3) being fixed to the filament base (9).

5. The continuous wave magnetron cathode assembly capable of suppressing microwave leakage according to claim 4, characterized in that: The multi-stage external choke group (4) includes two filament choke tubes (41) of different lengths and coaxially mounted on each other, and the two filament choke tubes (41) are both fixed to the filament base (9); the multi-stage internal choke group (5) includes two central choke tubes (51) of different lengths and coaxially mounted on each other, and the two central choke tubes (51) are both fixed to the cathode core rod group (2); one of the filament choke tubes (41) and one of the central choke tubes (51) are both used to suppress microwave leakage at the main mode frequency of the continuous wave magnetron, and the other filament choke tube (41) and the other central choke tube (51) are both used to suppress microwave leakage at the parasitic frequency of the continuous wave magnetron.

6. The continuous wave magnetron cathode assembly capable of suppressing microwave leakage according to claim 5, characterized in that: It also includes a pole shoe (6), wherein the cathode porcelain tube (12) is fixedly connected to the top of the pole shoe (6) through a pole shoe sealing ring (7); the multi-stage external choke group (4) also includes a pole shoe choke tube (42), wherein the pole shoe choke tube (42) is fixed to the top of the pole shoe (6), and the lower ends of the two filament choke tubes (41) extend into the pole shoe choke tube (42).

7. The continuous wave magnetron cathode assembly capable of suppressing microwave leakage according to claim 6, characterized in that: The main mode frequency is 2450 MHz, the length of the longer filament choke (41), the length of the longer center choke (51), and the length of the pole shoe choke (42) all fall within the range of 27 mm to 33 mm; the parasitic frequency is 3430 MHz, the length of the shorter filament choke (41) and the length of the shorter center choke (51) all fall within the range of 17 mm to 23 mm.

8. The continuous wave magnetron cathode assembly capable of suppressing microwave leakage according to claim 3, characterized in that: The cathode core rod group (2) comprises a cathode core rod (21) and a core rod base (22); the cathode core rod (21) and the multi-stage internal choke group (5) are coaxially fixed to the core rod base (22), and the multi-stage internal choke group (5) is sleeved on the outside of the cathode core rod (21).

9. The continuous wave magnetron cathode assembly capable of suppressing microwave leakage according to claim 8, characterized in that: It also includes a support rod base (8), the support rod base (8) is fixed to the top of the filament porcelain tube (11), and the core rod base (22) is fixedly connected to the support rod base (8).

10. The continuous wave magnetron cathode assembly capable of suppressing microwave leakage according to claim 1, characterized in that: The multi-stage external choke group (4) and the multi-stage internal choke group (5) are both made of metal material.

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