High-performance cavity filter

Abstract

The utility model discloses a high-performance cavity filter, which comprises a cavity, a plurality of resonance rods, a plurality of tuning screws correspondingly connected with each resonance rod and a negative pole point adjusting structure, the cavity is provided with an input port and an output port, the output port is arranged at the bottom of the cavity and is connected with a connector outside the cavity, and the connector is connected with the cavity. The plurality of resonant rods are respectively and independently fixed in the cavity in a split manner through screws, a coupling cavity is formed between every two adjacent resonant columns, the outer wall of the cavity is provided with an adjusting cavity which is communicated with the interior of the cavity and is used for realizing energy coupling between the interior and the exterior of the cavity, and the negative pole point adjusting structure is arranged in the adjusting cavity in the cavity. The position of the adjusting cavity and the distance between the resonance rods are adjusted.

Description

Technical Field

[0001] The utility model relates to the technical field of communication equipment, in particular to a high-performance cavity filter. Background Art

[0002] Filters are key equipment in modern mobile communication systems. Cavity filters are increasingly used in radar, satellite communications, mobile communications and other fields. They are used to eliminate clutter and interference signals other than the required signal frequency and are a common frequency selection device.

[0003] The cavity filter is a purely structural device, and its performance index and reliability depend on its own structural characteristics. It adopts a resonant cavity structure, each resonant rod is an independent resonator, and a coupling window is formed between adjacent resonators. The resonator and the coupling window form a microwave structure with filtering function to achieve microwave filtering function. However, the cavity filter in the prior art has problems such as insufficient selectivity, large insertion loss, and narrow stopband, which makes it difficult to meet the high performance requirements of modern communication systems. Therefore, a cavity filter with high selectivity, low insertion loss, and wide stopband is needed. Utility Model Content

[0004] The utility model aims to provide a high-performance cavity filter, which is used to solve the problems of insufficient selectivity, large insertion loss and narrow stop band of the cavity filter in the prior art.

[0005] In order to solve the above technical problems, the utility model adopts the following solutions:

[0006] A high-performance cavity filter comprises a cavity, a plurality of resonant rods, a plurality of tuning screws corresponding to each resonant rod and a negative pole adjustment structure, wherein an input port and an output port are arranged on the cavity, the output port is arranged at the bottom of the cavity and is connected to a connector outside the cavity, a plurality of resonant rods are independently and separately fixed inside the cavity by screws, a coupling cavity is formed between two adjacent resonant columns, an adjustment cavity is arranged on the outer wall of the cavity and extends into the cavity for realizing energy coupling between the cavity and the outside, an installation groove for placing a negative pole adjustment structure is arranged in the adjustment cavity inside the cavity, and the negative pole adjustment structure is used to adjust the position of the adjustment cavity and the distance between the resonant rods.

[0007] In some optional embodiments, the negative pole adjustment structure uses a copper rod.

[0008] In some optional embodiments, the resonant rod is cylindrical and hollow inside.

[0009] In some optional embodiments, a plurality of resonant rods are divided into two rows and arranged in parallel inside the cavity.

[0010] In some optional embodiments, in each row of resonant rods, coupling ribs are connected between adjacent resonant rods in the connected cavities.

[0011] In some optional embodiments, the plurality of resonant rods include two first resonant rods respectively disposed near the input port and the output port, and a second resonant rod disposed between the two first resonant rods, and the length of the first resonant rod is greater than that of the second resonant rod.

[0012] In some optional embodiments, an input tap line and an output tap line are also included, wherein two ends of the input tap line are respectively connected to the input port and the first resonant rod closest to the input port, and two ends of the output tap line are respectively connected to the output port and the first resonant rod closest to the output port.

[0013] In some optional embodiments, the cavity is in the shape of a cube with an opening on the top, a cover plate is provided above the opening, a tuning screw is provided on the cover plate, and the cover plate is fixedly connected to the cavity by screws.

[0014] In some optional embodiments, the cover plate and the cavity are made of aluminum alloy.

[0015] Beneficial effects of the utility model:

[0016] The utility model discloses a high-performance cavity filter, in which a connector is connected to the output port at the bottom of the cavity. The structure is reasonable, which greatly improves the power capacity and reliability of the cavity filter, and makes up for the previous problems of large size, poor grounding performance, large signal leakage, poor matching effect, and poor heat dissipation. Highly selective filtering is achieved by optimizing the arrangement and coupling strength of the resonant rods. The position and size of the coupling cavity are adjusted by adding two negative pole adjustment structures to achieve high suppression in a wide stopband. The cavity structure with a high Q value of the same extraction structure is designed, which has the advantages of high power, high out-of-band suppression and small insertion loss, and is easy to install and debug. The use of two resonant rods of different size structures makes it easier to adjust to the appropriate frequency for common output to increase the power capacity. The use of aluminum alloy material increases the heat dissipation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of the transverse cross-sectional structure of a cavity filter provided in an embodiment of the utility model;

[0018] Figure 2 A schematic diagram of the longitudinal cross-sectional structure of a cavity filter provided in an embodiment of the utility model;

[0019] Figure 3 A front view of a cavity filter provided by an embodiment of the utility model;

[0020] Figure 4 A top view of a cavity filter provided in an embodiment of the utility model.

[0021] Description of reference numerals:

[0022] 1-cavity, 2-input port, 3-output port, 4-tuning screw, 5-first resonant rod, 6-second resonant rod, 7-coupling cavity, 8-negative pole adjustment structure, 9-mounting hole, 10-input tap line, 11-output tap line, 12-coupling rib, 13-adjustment cavity, 14-cover plate. DETAILED DESCRIPTION

[0023] The present invention will be further described in detail below in conjunction with the embodiments and drawings, but the implementation manner of the present invention is not limited thereto.

[0024] In the description of the present utility model, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "longitudinal", "lateral", "horizontal", "inside", "outside", "front", "back", "top", "bottom", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are the directions or positional relationships in which the utility model product is usually placed when in use. They are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present utility model.

[0025] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "open", "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] The present invention is described in detail below with reference to the accompanying drawings and in combination with embodiments:

[0027] Embodiment 1:

[0028] like Figures 1 to 3As shown, this embodiment provides a high-performance cavity 1 filter, a high-performance cavity 1 filter, including a cavity 1, a plurality of resonant rods, a plurality of tuning screws 4 corresponding to each resonant rod, and a negative pole adjustment structure 8. The cavity 1 is provided with an input port 2 and an output port 3, the output port 3 is arranged at the bottom of the cavity 1, and the output port 3 is connected to the connector outside the cavity 1, and the plurality of resonant rods are independently and separately fixed inside the cavity 1 by screws, and a coupling cavity 7 is formed between two adjacent resonant columns. The outer wall of the cavity 1 is provided with an adjustment cavity 13 extending into the cavity 1 for realizing energy coupling between the cavity 1 and the outside, and the adjustment cavity 13 inside the cavity 1 is provided with a mounting groove for placing the negative pole adjustment structure 8, and the negative pole adjustment structure 8 is used to adjust the position of the adjustment cavity 13 and the distance between the resonant rods. As shown in the figure, the adjustment cavity 13 extends from the side wall to the inside of the cavity 1, and two negative pole adjustment structures 8 are provided, which are respectively arranged in the adjustment cavity 13, and the negative pole adjustment structure 8 uses a copper rod.

[0029] Specifically, the resonant rod is cylindrical and hollow inside, and a plurality of resonant rods are arranged in two parallel rows inside the cavity 1, and the adjustment cavity 13 extends into the cavity 1 and separates some resonant rods inside the cavity 1. The plurality of resonant rods include resonant rods of two different size structures, and the two resonant rods of different size structures are two first resonant rods 5 arranged near the input port 2 and the output port 3, and a second resonant rod 6 arranged between the two first resonant rods 5, and the length of the first resonant rod 5 is greater than the length of the second resonant rod 6. Figure 1 As shown, six resonant rods are provided, wherein in each row of resonant rods, coupling ribs 12 are connected between adjacent resonant rods in the connected cavity 1. The function of the coupling ribs 12 is to strengthen the coupling strength between two resonant rods that are far away. If two adjacent resonant rods are separated by an adjustment cavity 13, the energy coupling between the inside and outside of the cavity 1 can be achieved through the adjustment cavity 13. The negative pole adjustment structure 8 adjusts the position of the adjustment cavity 13, and then adjusts the distance between the four adjacent resonant rods to meet the high out-of-band suppression.

[0030] like Figure 2 As shown, the cavity 1 also includes an input tap line 10 and an output tap line 11, the two ends of the input tap line 10 are respectively connected to the input port 2 and the first resonance rod 5 closest to the input port 2, and the two ends of the output tap line 11 are respectively connected to the output port 3 and the first resonance rod 5 closest to the output port 3. The cavity 1 structure with a high Q value in the same extraction mode is designed, and the advantages of the cavity 1 are that it has the advantages of high power, high out-of-band suppression and small insertion loss, and is easy to install and debug.

[0031] The cavity 1 is in the shape of a cube, with an opening at the top. Figure 3 , Figure 4As shown, a cover plate 14 is provided above the opening, a tuning screw 4 is arranged on the cover plate 14, and a mounting hole 9 is provided on the cavity 1. Figure 1 As shown, mounting holes 9 are provided at the four corners of the cavity 1, and the cover plate 14 is fixedly connected to the cavity 1 by installing screws in the mounting holes 9. The cover plate 14 is used to encapsulate the internal components. In order to increase the heat dissipation effect, the cover plate 14 and the cavity 1 shell are made of aluminum alloy.

[0032] The working principle of this embodiment is as follows: the adjustment cavity 13 is arranged on the side wall of the cavity 1 to realize the energy coupling between the inside and outside of the cavity 1, and the resonant rod is arranged in the cavity 1 to generate resonance, and a coupling cavity 7 is formed between two adjacent resonant rods. The cavity 1 structure with a high Q value of the same extraction structure is used to design the inside of the cavity 1, so that the cavity 1 filter has the advantages of high power, high out-of-band suppression and small insertion loss, and is easy to install and debug. By adding two negative poles to adjust the position and size of the adjustment cavity 13, high suppression in a wide stopband is achieved.

[0033] It is understood that the above embodiments are merely exemplary embodiments used to illustrate the principles of the present invention, but the present invention is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A high performance cavity filter, characterized in that: The invention comprises a cavity (1), a plurality of resonant rods, a plurality of tuning screws (4) corresponding to each resonant rod, and a negative pole adjustment structure (8); an input port (2) and an output port (3) are provided on the cavity (1); the output port (3) is arranged at the bottom of the cavity (1), and the output port (3) is connected to a connector outside the cavity (1); the plurality of resonant rods are independently and separately fixed inside the cavity (1) by screws; a coupling cavity (7) is formed between two adjacent resonant rods; an adjustment cavity (13) is provided on the outer wall of the cavity (1) and extends into the cavity (1) to realize energy coupling between the cavity (1) and the outside; a mounting groove for placing the negative pole adjustment structure (8) is provided in the adjustment cavity (13) inside the cavity (1); and the negative pole adjustment structure (8) is used to adjust the position of the adjustment cavity (13) and the distance between the resonant rods.

2. A high performance cavity filter according to claim 1, characterized in that: The negative pole adjustment structure (8) adopts a copper rod.

3. A high performance cavity filter according to claim 1, characterized in that: The resonant rod is cylindrical and hollow inside.

4. A high performance cavity filter according to claim 1, characterized in that: A plurality of resonant rods are divided into two rows and arranged in parallel inside the cavity (1).

5. A high performance cavity filter according to claim 4, characterized in that: In each row of resonant rods, coupling ribs (12) are connected between adjacent resonant rods in the connected cavities (1).

6. A high performance cavity filter according to claim 1, characterized in that: The plurality of resonant rods include two first resonant rods (5) respectively arranged near an input port (2) and an output port (3), and a second resonant rod (6) arranged between the two first resonant rods (5). The length of the first resonant rod (5) is greater than the length of the second resonant rod (6).

7. A high performance cavity filter according to claim 6, characterized in that: It also includes an input tap line (10) and an output tap line (11), wherein two ends of the input tap line (10) are respectively connected to the input port (2) and the first resonant rod (5) closest to the input port (2), and two ends of the output tap line (11) are respectively connected to the output port (3) and the first resonant rod (5) closest to the output port (3).

8. The high performance cavity filter according to claim 1, characterized in that: The cavity (1) is in the shape of a cube, with an opening provided on the top, a cover plate (14) provided above the opening, a tuning screw (4) provided on the cover plate (14), and the cover plate (14) and the cavity (1) are fixedly connected by screws.

9. A high performance cavity filter according to claim 3, characterized in that: The cover plate (14) and the cavity (1) are made of aluminum alloy.

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