An X-band high-power circular waveguide cavity filter

Abstract

The present invention relates to an X-band high-power circular waveguide cavity filter, which is particularly suitable for completing the function of suppressing interference signals in the channel of a high-power communication system. The X-band high-power circular waveguide cavity filter comprises a box body (1), a cover plate (2) and a fastening screw (6), wherein the cover plate (2) is buckled on the top of the box body (1). The box body (1) is equipped with a coupling tuning screw (4) and a frequency tuning screw (5), and the coupling tuning screw (4) and the frequency tuning screw (5) are symmetrically arranged on both sides of the box body (1). The cover plate (2) is equipped with an input and output coupling tuning screw (3). The present invention adopts a circular waveguide resonant cavity and a symmetrical tuning method, and has the characteristics of large power capacity, low loss, and convenient and fast tuning.

Description

Technical Field

[0001] The invention relates to an X-band high-power circular waveguide cavity filter, belonging to the technical field of microwave filters. Background Art

[0002] As communication capacity increases, higher requirements are placed on the power, quality and volume of cavity filters.

[0003] In the prior art, the Chinese invention patent with patent number CN201110047723.3 discloses a "high-power corner-cut square cavity filter" which uses a 4th-order corner-cut square cavity filter to achieve TE011 mode transmission and is used for Ku-band filters, but the Q value of the square cavity filter is relatively low. The Chinese invention patent with patent number CN201110052437.6 discloses a "circular cavity dual-mode sidewall coupled filter for parasitic coupling suppression" which proposes a high-power circular cavity filter for single-mode transmission, but the structure is complex and not conducive to processing and debugging.

[0004] The advantages of circular waveguide cavity filters are high Q value and high power handling capacity, but the difficulty to be overcome is to achieve single-mode transmission. Currently, there is a need for a high-power circular cavity filter that is easy to process and debug and can handle more than 2000W. Summary of the invention

[0005] The object of the present invention is to overcome the above-mentioned shortcomings and provide an X-band high-power circular waveguide cavity filter. The present invention is characterized by high power, circular waveguide cavity structure and symmetrical tuning method, while having a simple structure and easy processing and manufacturing.

[0006] In order to solve the above technical problems, the technical solution provided by the present invention is:

[0007] An X-band high-power circular waveguide cavity filter comprises a box body 1, a cover plate 2 and a fastening screw 6, wherein the cover plate 2 is buckled on the top of the box body 1, an input / output port 7 is respectively arranged at both ends of the box body 1, a plurality of circular waveguide resonant cavities 8 are arranged between the two input / output ports 7, an inter-cavity coupling 10 between adjacent circular waveguide resonant cavities 8 is a rectangular coupling window structure, and an input / output coupling 9 between the input / output port 7 and the adjacent circular waveguide resonant cavities 8 is a rectangular coupling window structure, characterized in that: it also comprises a plurality of coupling tuning screws 4 corresponding to the plurality of inter-cavity couplings 10 one by one, and a plurality of frequency tuning screws 5 corresponding to the plurality of circular waveguide resonant cavities 8 one by one; the coupling tuning screw 4 is arranged on the side wall of the box body 1, one end of the coupling tuning screw 4 is located in the inter-cavity coupling 10, and the other end of the coupling tuning screw 4 is located outside the side wall of the box body 1; the frequency tuning screw 5 is arranged on the side wall of the box body 1, one end of the frequency tuning screw 5 is located in the circular waveguide resonant cavity 8, and the other end of the frequency tuning screw 5 is located outside the side wall of the box body 1.

[0008] The coupling tuning screws 4 are arranged in pairs, and the pair of coupling tuning screws 4 are arranged on the corresponding two sides of the box body 1 ; the frequency tuning screws 5 are arranged in pairs, and the pair of frequency tuning screws 5 are arranged on the corresponding two sides of the box body 1 .

[0009] It also includes an input-output coupling tuning screw 3; the input-output coupling tuning screw 3 is arranged on the cover plate 2, one end of the input-output coupling tuning screw 3 is located inside the input-output coupling 9, and the other end of the input-output coupling tuning screw 3 is located outside the cover plate 2.

[0010] The coupling tuning screw 4 is located at the lower position in the height direction of the inter-cavity coupling 10; and the frequency tuning screw 5 is located at the middle position in the height direction of the circular waveguide resonant cavity 8.

[0011] Due to the adoption of the above technical solution, the technical progress achieved by the present invention is:

[0012] 1. The present invention adopts a circular waveguide cavity as a resonant cavity and works in a single-mode TE111 mode, which has the characteristics of a high Q value and meets the low loss requirements of the filter. At the same time, since the maximum value of the electric field of the TE111 mode is distributed in the middle part of the cavity, the filter has a large power capacity, and the power capacity in the X-band reaches more than 2000W.

[0013] 2. The present invention adopts a symmetrical distribution of the coupling tuning screw 4 and the frequency tuning screw 5. The tuning screws are symmetrically distributed on the corresponding two sides of the box body 1; the coupling tuning screw 4 is located at the lower position in the height direction of the inter-cavity coupling 10, and the frequency tuning screw 5 is located in the middle position in the height direction of the circular waveguide resonant cavity 8, which is also the position with greater field strength. This setting method has higher sensitivity of the coupling tuning screw 4 and the frequency tuning screw 5, and a larger frequency tuning amount and coupling tuning amount can be achieved with a smaller tuning length, avoiding the disadvantage that the tip discharge caused by the tuning screw being too deep into the resonant cavity affects the filter performance, and also improves the tuning range of the filter and the success rate of the filter debugging. At the same time, the circular waveguide cavity will produce micro-perturbations after the tuning screw is deeply inserted into the resonant cavity, and frequency components that affect the working performance will appear in the working frequency range of interest, resulting in burrs on the filter curve. The setting of the symmetrical tuning screws allows the tuning screws to be adjusted symmetrically during the filter debugging to avoid the appearance of other frequency components, ensuring the smoothness of the filter curve.

[0014] 3. The present invention adopts a rectangular coupling window structure, and the circular waveguide cavity and the coupling window have one side on the same plane, and the circular waveguide cavity and the coupling window are arranged in a uniform straight line, so that the filter has only two main structures of the box body 1 and the cover plate 2, which are assembled by fastening screws 6. The filter has the characteristics of simple structure, easy processing and manufacturing, and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the present invention;

[0016] Figure 2 It is a structural schematic diagram (top view) of the present invention;

[0017] Figure 3 It is a schematic structural diagram of the box body 1 of the present invention;

[0018] Figure 4 It is a schematic structural diagram of the cover plate 2 of the present invention. DETAILED DESCRIPTION

[0019] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments:

[0020] Figure 1 It is a schematic diagram of the structure of the present invention, comprising a box body 1, a cover plate 2 and a fastening screw 6, wherein the cover plate 2 is buckled on the top of the box body 1. The box body 1 is equipped with a coupling tuning screw 4 and a frequency tuning screw 5, and the coupling tuning screw 4 and the frequency tuning screw 5 are symmetrically arranged on both sides of the box body 1. The cover plate 2 is equipped with an input and output coupling tuning screw 3. The box body 1 and the cover plate 2 are assembled together by the fastening screw 6. The input and output tuning screw 3 adjusts the input and output coupling amount by adjusting the length of the deep input and output coupling 9; the coupling tuning screw 4 adjusts the inter-cavity coupling amount by adjusting the length of the deep inter-cavity coupling 10; the frequency tuning screw 5 adjusts the resonant frequency of the circular waveguide resonant cavity by adjusting the length of the deep circular waveguide resonant cavity 8.

[0021] Figure 2 It is a schematic diagram (top view) of the structure of the present invention. The coupling tuning screws 4 are arranged in pairs, and the pair of coupling tuning screws 4 are arranged on the corresponding two sides of the box body 1; the frequency tuning screws 5 are arranged in pairs, and the pair of frequency tuning screws 5 are arranged on the corresponding two sides of the box body 1. The coupling tuning screws 4 are located at the lower position in the height direction of the inter-cavity coupling 10; the frequency tuning screws 5 are located in the middle position in the height direction of the circular waveguide resonant cavity 8. This setting method has higher sensitivity of the frequency tuning screws 5 and the coupling tuning screws 4, and it is more convenient to obtain the required filter electrical performance curve during debugging. At the same time, the symmetrically distributed tuning method suppresses the generation of interference frequency components.

[0022] Figure 3It is a schematic diagram of the structure of the box body 1 of the present invention. An input and output port 7 is provided at each end. A plurality of circular waveguide resonant cavities 8 are provided between the two input and output ports 7. The inter-cavity coupling 10 between adjacent circular waveguide resonant cavities 8 is a rectangular coupling window structure. The input and output coupling 9 between the input and output port 7 and the adjacent circular waveguide resonant cavity 8 is a rectangular coupling window structure. The heat dissipation teeth 11 are located on both sides of the box body 1. The input and output port 7 is the input and output port of the filter signal, which is in the form of a standard flange FDP84 and can meet the requirements of high power passing. The number of circular waveguide resonant cavities 8 can be between 2 and 11 according to the needs of the electrical performance of the filter, and they are evenly arranged in a straight line. The depth of the circular waveguide resonant cavity 8 is adjusted according to the different resonant frequencies. The inter-cavity coupling 10 is located between the circular waveguide resonant cavities 8 and is a rectangular structure. The input and output coupling 9 is located between the input and output port 7 and the circular waveguide resonant cavity 8 and is a rectangular structure. The widths of the two are equal, and the coupling amount is changed by adjusting the height. The heat dissipation teeth 11 are located on both sides of the box body 1, and the heat dissipation is quickly realized when the filter is working, ensuring that the filter temperature is within a reasonable range.

[0023] Figure 4 It is a schematic diagram of the structure of the cover plate 2 of the present invention, with stepped structures 12 at both ends, the shape of which corresponds to the box body 1. This structure can better realize the shielding function, prevent the electromagnetic energy inside the filter from leaking out, and improve the electrical performance of the filter.

Claims

1. An X-band high-power circular waveguide cavity filter, comprising a box body (1), a cover plate (2) and a fastening screw (6), wherein the cover plate (2) is buckled on the top of the box body (1), an input / output port (7) is provided at each end of the box body (1), a plurality of circular waveguide resonant cavities (8) are provided between the two input / output ports (7), the inter-cavity coupling (10) between adjacent circular waveguide resonant cavities (8) is a rectangular coupling window structure, and the input / output coupling (9) between the input / output port (7) and the adjacent circular waveguide resonant cavities (8) is a rectangular coupling window structure, characterized in that: It also includes a plurality of coupling tuning screws (4) corresponding one-to-one to the plurality of inter-cavity couplings (10), and a plurality of frequency tuning screws (5) corresponding one-to-one to the plurality of circular waveguide resonant cavities (8); the coupling tuning screws (4) are arranged on the side wall of the box body (1), one end of the coupling tuning screws (4) is located inside the inter-cavity couplings (10), and the other end of the coupling tuning screws (4) is located outside the side wall of the box body (1); the frequency tuning screws (5) are arranged on the side wall of the box body (1), one end of the frequency tuning screws (5) is located inside the circular waveguide resonant cavities (8), and the other end of the frequency tuning screws (5) is located outside the side wall of the box body (1); The coupling tuning screws (4) are arranged in pairs, and the pair of coupling tuning screws (4) are arranged on corresponding two sides of the box body (1); the frequency tuning screws (5) are arranged in pairs, and the pair of frequency tuning screws (5) are arranged on corresponding two sides of the box body (1); It also includes an input-output coupling tuning screw (3); the input-output coupling tuning screw (3) is arranged on the cover plate (2), one end of the input-output coupling tuning screw (3) is located inside the input-output coupling (9), and the other end of the input-output coupling tuning screw (3) is located outside the cover plate (2); The coupling tuning screw (4) is located at a lower position in the height direction of the inter-cavity coupling (10); the frequency tuning screw (5) is located at a middle position in the height direction of the circular waveguide resonant cavity (8); The heat dissipation teeth (11) are located on both sides of the box body (1).

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