Magnetron excitation cavity

Abstract

The present invention discloses a magnetron excitation cavity, comprising a rectangular portion and a semi-cylindrical upper portion arranged above the rectangular portion, wherein the interiors of the rectangular portion and the upper portion are both hollow and connected to form a cavity, and the top of the rectangular portion is matched with and connected to the rectangular surface of the upper portion, and the bottom of the rectangular portion is open, and a plurality of interference rods are arranged in the cavity, and a welding ring for installing a magnetron is arranged on a panel connected to the rectangular portion and one of the semi-circular surfaces. By designing the upper portion of the magnetron excitation cavity into a semi-cylindrical shape, the reflection transmission of microwaves is improved, and the sparking phenomenon at the boundary is reduced. By arranging a welding ring on the rectangular portion of the excitation cavity, the precise welding of the excitation cavity and the magnetron is ensured, thereby achieving the purpose of ensuring product quality, facilitating microwave reflection and transmission, realizing efficient coupled transmission of microwaves, and improving transmission efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of magnetrons, and in particular to a magnetron excitation cavity with high transmission efficiency. Background Art

[0002] At present, the excitation cavities of magnetrons on the market are mostly square excitation cavities, which have an impact on the reflection and transmission of microwaves. In addition, the transmission efficiency of the excitation cavities on the market is low, and the efficient coupling transmission of microwaves cannot be achieved.

[0003] The information disclosed in this background technology section is only intended to deepen the understanding of the overall background technology of the present invention, and should not be regarded as acknowledging or suggesting in any form that the information constitutes the prior art already known to those skilled in the art. Summary of the invention

[0004] In order to solve the above technical problems, the present invention proposes a magnetron excitation cavity to facilitate the reflection and transmission of microwaves, realize efficient coupled transmission of microwaves and improve transmission efficiency.

[0005] To achieve the above object, the technical solution of the present invention is as follows:

[0006] A magnetron excitation cavity comprises a rectangular portion and a semi-cylindrical upper portion arranged above the rectangular portion, wherein the interiors of the rectangular portion and the upper portion are both hollow and connected to form a cavity, and the top of the rectangular portion is matched with and connected to the rectangular surface of the upper portion, and the bottom of the rectangular portion is open, and a plurality of interference rods are arranged in the cavity.

[0007] A welding ring for mounting the magnetron is provided on a panel connecting the rectangular portion and one of the semicircular surfaces.

[0008] The present invention improves the reflection transmission of microwaves and reduces the sparking phenomenon at the boundary by designing the upper part of the excitation cavity of the magnetron into a semi-cylindrical shape, and ensures the precise welding of the excitation cavity and the magnetron by arranging a welding ring in the rectangular part of the excitation cavity, thereby achieving the purposes of ensuring product quality, facilitating microwave reflection and transmission, realizing efficient coupled transmission of microwaves and improving transmission efficiency.

[0009] Preferably, a first interference rod is provided between the two symmetrical semicircular surfaces on the upper portion;

[0010] The welding ring is installed on the front panel of the rectangular part, and a second interference rod is also arranged on the front panel of the rectangular part, and the second interference rod is located below the welding ring; two third interference rods are arranged on the back panel of the rectangular part, and the two third interference rods are arranged on the upper and lower sides of the second interference rod, and the third interference rod located above passes through the center of the welding ring in a straight line. The second interference rod and the third interference rod are both in the cavity of the rectangular part. By arranging four interference rods in the excitation cavity and setting them according to the positions of the present invention, microwaves can be better coupled and the transmission efficiency can be further improved.

[0011] Preferably, a flange is installed at the open bottom of the rectangular portion.

[0012] The present invention has the following advantages:

[0013] 1. The present invention improves the reflection transmission of microwaves and reduces the sparking phenomenon at the boundary by designing the upper part of the excitation cavity of the magnetron into a semi-cylindrical shape. By arranging a welding ring in the rectangular part of the excitation cavity, the precise welding of the excitation cavity and the magnetron is ensured, thereby achieving the purpose of ensuring product quality, facilitating microwave reflection and transmission, realizing efficient coupled transmission of microwaves and improving transmission efficiency.

[0014] 2. The present invention provides four interference rods in the excitation cavity and sets them according to the positions of the present invention, so as to better couple microwaves and further improve the transmission efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below.

[0016] Figure 1 A schematic diagram of the structure of a magnetron excitation cavity disclosed in an embodiment of the present invention;

[0017] Figure 2 A side cross-sectional view of a magnetron excitation cavity disclosed in an embodiment of the present invention;

[0018] Figure 3 A simulation curve diagram of the magnetron excitation cavity disclosed in an embodiment of the present invention;

[0019] Figure 4 for Figure 3 Simulation curve of S11;

[0020] Figure 5 for Figure 3 Simulation curve of S21;

[0021] The numbers and letters in the figure represent the corresponding component names:

[0022] 1. Rectangular part 2. Upper part 3. Cavity 41. First interference rod 42. Second interference rod

[0023] 43. Third interference rod 5. Welding ring 6. Flange. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0025] The present invention provides a magnetron excitation cavity, the working principle of which is to improve the reflection transmission of microwaves and reduce the sparking phenomenon at the boundary by designing the upper part of the excitation cavity of the magnetron into a semi-cylindrical shape, and to ensure the precise welding of the excitation cavity and the magnetron by arranging a welding ring on the rectangular part of the excitation cavity, so as to achieve the purpose of ensuring product quality, facilitating microwave reflection and transmission, realizing efficient coupled transmission of microwaves and improving transmission efficiency.

[0026] The present invention is further described in detail below with reference to examples and specific implementation modes.

[0027] like Figure 1-Figure 4 As shown, a magnetron excitation cavity comprises a rectangular portion 1 and a semi-cylindrical upper portion 2 arranged above the rectangular portion, the interiors of the rectangular portion and the upper portion are both hollow and connected to form a cavity 3, and the top of the rectangular portion is matched with and connected to the rectangular surface of the upper portion, the bottom of the rectangular portion is open, and a plurality of interference rods are arranged in the cavity; a welding ring 5 for installing a magnetron is arranged on the front panel of the rectangular portion, and a flange 6 is arranged at the bottom of the rectangular portion.

[0028] The interference rods include a first interference rod 41, a second interference rod 42 and two third interference rods 43. The first interference rod is arranged between two symmetrical semicircular surfaces at the upper part;

[0029] The second interference rod is arranged on the front plate of the rectangular portion, and the second interference rod is located below the welding ring;

[0030] The two third interference rods are both arranged on the back plate of the rectangular portion, and the third interference rod located on the upper side passes through the center of the welding ring in a straight line.

[0031] The specific use steps of the present invention are as follows: Figure 1 and Figure 2 As shown, a simulation model is established according to a magnetron excitation cavity provided by the present invention, as follows:

[0032] The established excitation cavity model has a cavity length of 2 wavelengths, which can meet the simulation requirements. The short-circuit surface of the excitation cavity is the upper part 2 of the semi-cylinder. The center of the magnetron is located at the center of the semi-cylinder and inserted into the appropriate position. The material of the output window is set to 95 porcelain, and its specific size is determined according to the size of the magnetron (specific selection can be made according to actual conditions). The antenna is set to a suitable radius and insertion depth. The four interference rods we set are all located on the central axis. The specific positions are listed above, and the material is set to the ideal conductor PEC.

[0033] The specific simulation experiment is shown in the figure (where Figure 3 is the overall simulation diagram. Figure 4 yes Figure 3 In the S11 curve, Figure 5 yes Figure 3 (see S21 curve in the figure).

[0034] It can be clearly seen from the simulation diagram that at the center frequency of 1.497 GHz, the input return loss S11 is close to -69 dB, that is, the returned power is only 0.0000126% of the input, and the forward transmission coefficient S21 is close to -4.67×10 -7 dB, that is, the forward transmission power is 99.9999892% of the input power. And within the 10MHz bandwidth around the center frequency of 1.497GHz, its return loss S11 is also within -43dB, that is, the return power is only 0.005% of the input, and the transmission coefficient S21 is also above -0.0002dB, that is, the transmission power is 99.9953949% of the input power.

[0035] In summary, the added first interference bar, second interference bar and third interference bar have obvious effects on the simulation and high transmission efficiency.

[0036] Through the above manner, the magnetron excitation cavity provided by the present invention improves the reflection transmission of microwaves and reduces the sparking phenomenon at the boundary by designing the upper part of the magnetron excitation cavity into a semi-cylindrical shape, and ensures the precise welding of the excitation cavity and the magnetron by arranging a welding ring in the rectangular part of the excitation cavity, thereby achieving the purpose of ensuring product quality, facilitating microwave reflection and transmission, realizing efficient coupled transmission of microwaves and improving transmission efficiency.

[0037] The above is only a preferred embodiment of the magnetron excitation cavity disclosed in the present invention. It should be pointed out that a person skilled in the art can make several modifications and improvements without departing from the inventive concept of the present invention, and these all fall within the protection scope of the present invention.

Claims

1. A magnetron excitation cavity, characterized in that: It comprises a rectangular portion and a semi-cylindrical upper portion arranged above the rectangular portion, the interiors of the rectangular portion and the upper portion are both hollow and connected to form a cavity, and the top of the rectangular portion is matched with and connected to the rectangular surface of the upper portion, the bottom of the rectangular portion is open, and a plurality of interference rods are arranged in the cavity. A welding ring for mounting a magnetron is provided on the panel connecting the rectangular portion and one of the semicircular surfaces; A first interference rod is provided between the two symmetrical semicircular surfaces of the upper part; the welding ring is installed on the front panel of the rectangular part, and a second interference rod is also provided on the front panel of the rectangular part, and the second interference rod is located below the welding ring; two third interference rods are provided on the back panel of the rectangular part, and the two third interference rods are arranged on the upper and lower sides of the second interference rod, and the third interference rod located above passes through the center of the welding ring in a straight line; the second interference rod and the third interference rod are both in the cavity of the rectangular part; a flange is provided at the opening of the rectangular part.

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