An ultra-low frequency band filter structure

Abstract

The application discloses a kind of ultra-low frequency band filter structures, belongs to filter technical field.A kind of ultra-low frequency band filter structure, including cavity, further comprising: output connector and input connector connected in the upper and lower ends of cavity;Resonant rod is fixedly connected in the inner wall of cavity, and resonant rod is fixedly connected with resonant block;First frequency tuning screw rod is threadedly connected in the side of cavity, and one end of first frequency tuning screw rod is placed in cavity and cooperates with resonant block;Tuning screw is threadedly connected on the side of cavity away from first frequency tuning screw rod;Cover plate is arranged on cavity, and second frequency tuning screw rod is arranged on cover plate, and one end of second frequency tuning screw rod is placed in cavity and cooperates with resonant block;The application can realize bidirectional tuning structure in side and top surface, achieve the effect of frequency reduction, and the design is convenient to process, low in cost, relatively simple to realize, easy to control.

Description

Technical Field

[0001] This invention relates to the field of filter technology, and in particular to an ultra-low frequency filter structure. Background Technology

[0002] A filter is a device or system used for signal processing; it consists of capacitors, inductors, and resistors, and can effectively filter out specific frequencies or frequencies other than those in a power supply line to obtain a power signal of a specific frequency, or eliminate a power signal of a specific frequency.

[0003] In the design of conventional filters, duplexers, and multiplexers, customers require smaller dimensions and shallower depths, which may result in the inability to meet the required frequency range (the larger the dimensions and the deeper the depth, the lower the frequency, and vice versa). This leads to the design specifications failing to meet customer needs. In view of this, this invention is proposed. Summary of the Invention

[0004] The purpose of this invention is to solve the problems existing in the prior art and to propose an ultra-low frequency filter structure.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: An ultra-low frequency filter structure includes a cavity and further includes: The output connector and input connector are connected to the upper and lower ends of the cavity; A resonant rod is fixedly connected to the inner wall of the cavity, and a resonant block is fixedly connected to the resonant rod; A first frequency tuning screw is threaded onto the side of the cavity, and one end of the first frequency tuning screw is placed inside the cavity and cooperates with the resonant block. The tuning screw is threaded onto the side of the cavity away from the first frequency tuning screw; A cover plate is provided on the cavity, and a second frequency tuning screw is provided on the cover plate. One end of the second frequency tuning screw is placed inside the cavity and cooperates with the resonant block.

[0006] Preferably, the input connector is provided with an input fixing plate, and an input fixing screw is connected to the input fixing plate. One end of the input fixing screw passes through the input fixing plate and is threaded onto the cavity.

[0007] Furthermore, the output connector is provided with an output fixing plate, and an output fixing screw is connected to the output fixing plate. One end of the output fixing screw passes through the output fixing plate and is threaded onto the cavity.

[0008] Furthermore, multiple resonant rods and resonant blocks are provided, and multiple baffles are provided in the cavity, with the multiple resonant blocks separated by the baffles.

[0009] Furthermore, the input connector is provided with an input core rod, the output connector is provided with an output core rod, the input core rod is welded to the lowest resonant rod, and the output core rod is welded to the uppermost resonant rod.

[0010] Preferably, the resonant block is provided with a first transverse slot and a second transverse slot that are connected to each other, the first frequency tuning screw is inserted into the second transverse slot, and the second frequency tuning screw is inserted into the first transverse slot.

[0011] Furthermore, a first tuning nut is threaded onto the first frequency tuning screw, and a second tuning nut is threaded onto the second frequency tuning screw. The first tuning nut abuts against the side wall of the cavity, and the second tuning nut abuts against the outer wall of the cover plate.

[0012] Furthermore, the resonant rod has a connecting hole at the end away from the resonant block, and a countersunk hole is provided on the outer wall of the cavity. The tuning screw is connected in the countersunk hole, and the end of the tuning screw that passes through the cavity is threaded into the connecting hole.

[0013] Furthermore, the cover plate is provided with a coupling tuning screw, and a coupling tuning nut is threaded onto the coupling tuning screw. The coupling tuning nut abuts against the top outer wall of the cover plate. The coupling tuning screw is inserted into the cavity. There are multiple coupling tuning screws and multiple coupling tuning nuts. One end of each of the multiple coupling tuning screws placed in the cavity is positioned between two adjacent resonant rods.

[0014] Furthermore, the cavity is provided with mounting holes, and the cover plate is provided with locking screws, which pass through the cover plate and are threaded into the mounting holes.

[0015] Compared with the prior art, the present invention provides an ultra-low frequency filter structure with the following advantages: 1. This ultra-low frequency filter structure allows signals to be input through the input connector at the bottom of the cavity. By adjusting the first frequency tuning screw on the side of the cavity, frequency coupling adjustment can be performed to reduce the frequency. Increasing the number of first and second frequency tuning screws allows for a wider window coupling tuning range. A second frequency tuning screw is also provided on the cover plate, enabling bidirectional tuning from both the side and top surfaces, achieving frequency reduction. This design is easy to manufacture, low in cost, simple to implement, and easy to control. Depending on the requirements, different dielectric constants of the insulating material can be used to adjust the frequency to meet specific customer needs.

[0016] 2. This ultra-low frequency filter structure allows for adjustment of the filter's performance by varying the depth of the first frequency tuning screw inserted into the second transverse slot and the depth of the second frequency tuning screw within the first transverse slot, and then fixing it with the first and second tuning nuts. This enables the filter to adapt to different application requirements and achieve different coupling values. Furthermore, the use of a bidirectional coupling structure on the side and top surfaces further enhances the frequency reduction effect.

[0017] 3. This ultra-low frequency filter structure solves the problem of achieving the required frequency range for customers when the filter, duplexer, and combiner are designed with small size and height. It avoids the problems of insertion loss not meeting customer requirements and high cost of flange resonant columns, which are caused by using similar mushroom-head flange resonant columns. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the ultra-low frequency filter structure proposed in this invention. Figure 1 ; Figure 2 This is a schematic diagram of the ultra-low frequency filter structure proposed in this invention. Figure 2 ; Figure 3 This is the front view of an ultra-low frequency filter structure without a cover plate proposed in this invention. Figure 1 ; Figure 4 This invention proposes an ultra-low frequency band filter structure. Figure 3 Enlarged view of section A; Figure 5 This is the front view of an ultra-low frequency filter structure without a cover plate proposed in this invention. Figure 2 ; Figure 6 This is a three-dimensional structural diagram of an ultra-low frequency filter structure without a cover plate proposed in this invention; Figure 7 This is a cross-sectional schematic diagram of an ultra-low frequency filter structure proposed in this invention; Figure 8 This is a schematic diagram of the resonant rod and resonant block in an ultra-low frequency filter structure proposed in this invention. Figure 1 ; Figure 9 This is a schematic diagram of the resonant rod and resonant block in an ultra-low frequency filter structure proposed in this invention. Figure 2 .

[0019] In the diagram: 1. Cavity; 101. Cover plate; 102. Locking screw; 103. Mounting hole; 104. Countersunk hole; 105. Tuning screw; 2. Input connector; 201. Input fixing plate; 202. Input fixing screw; 203. Input core rod; 3. Output connector; 301. Output fixing plate; 302. Output fixing screw; 303. Output core rod; 4. Resonant rod; 401. Resonant block; 402. First transverse groove; 403. Second transverse groove; 404. Stop block; 405. Connecting hole; 5. First frequency tuning screw; 501. First tuning nut; 502. Second frequency tuning screw; 503. Second tuning nut; 504. Coupling tuning screw; 505. Coupling tuning nut. Detailed Implementation

[0020] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0021] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. Example

[0022] Reference Figures 1-9 An ultra-low frequency filter structure includes a cavity 1, characterized in that it further includes an output connector 3 and an input connector 2 connected to the upper and lower ends of the cavity 1; a resonant rod 4 fixedly connected to the inner wall of the cavity 1, and a resonant block 401 fixedly connected to the resonant rod 4; a first frequency tuning screw 5 threadedly connected to the side of the cavity 1, one end of the first frequency tuning screw 5 placed inside the cavity 1 cooperating with the resonant block 401; a tuning screw 105 threadedly connected to the side of the cavity 1 away from the first frequency tuning screw 5; a cover plate 101 is also provided on the cavity 1, and a second frequency tuning screw 502 is provided on the cover plate 101, one end of the second frequency tuning screw 502 placed inside the cavity 1 cooperating with the resonant block 401.

[0023] In this embodiment, during use, a signal can be input through the input connector 2 at the bottom of the cavity 1. After the signal is input, it passes through the resonant rod 4. In this application, the resonant rod 4 is set to be square. In the filter, the square resonant block 401 mainly improves the NVH performance and circuit parameters of the circuit, and can also improve the quality factor of the circuit, that is, reduce the circuit loss and improve the circuit operating efficiency. In specific use, by adjusting the first frequency tuning screw 5 on the side of the cavity 1, frequency coupling adjustment can be performed, thereby achieving the effect of reducing the frequency. At the same time, the coupling of the first frequency tuning screw 5 and the second frequency is increased. The number of tuning screws 502 is increased to achieve a wider window coupling tuning range. A second frequency tuning screw 502 is provided on the cover plate 101, which can realize a bidirectional tuning structure on the side and top. The frequency can be tuned on both sides to achieve the frequency reduction effect. This design has the advantages of convenient processing, low cost, simple implementation, and easy control. According to the requirements, it can be arbitrarily adjusted by using insulation materials with different dielectric constants to meet customer needs. The filtered signal can be output through the output connector 3 set on the top. The cover plate 101 can ensure the sealing performance of the cavity 1. Example

[0024] Reference Figures 1-9 An ultra-low frequency filter structure includes a cavity 1, characterized in that it further includes an output connector 3 and an input connector 2 connected to the upper and lower ends of the cavity 1; a resonant rod 4 fixedly connected to the inner wall of the cavity 1, and a resonant block 401 fixedly connected to the resonant rod 4; a first frequency tuning screw 5 threadedly connected to the side of the cavity 1, one end of the first frequency tuning screw 5 placed inside the cavity 1 cooperating with the resonant block 401; a tuning screw 105 threadedly connected to the side of the cavity 1 away from the first frequency tuning screw 5; a cover plate 101 is also provided on the cavity 1, and a second frequency tuning screw 502 is provided on the cover plate 101, one end of the second frequency tuning screw 502 placed inside the cavity 1 cooperating with the resonant block 401.

[0025] Reference Figures 1-3 , Figure 5 and Figure 6 The input connector 2 is provided with an input fixing plate 201, and an input fixing screw 202 is connected to the input fixing plate 201. One end of the input fixing screw 202 passes through the input fixing plate 201 and is threaded onto the cavity 1.

[0026] Reference Figures 1-3 , Figure 5 and Figure 6 The output connector 3 is provided with an output fixing plate 301, and an output fixing screw 302 is connected to the output fixing plate 301. One end of the output fixing screw 302 passes through the output fixing plate 301 and is threaded onto the cavity 1.

[0027] In this embodiment, when installing the input connector 2 and the output connector 3, the input fixing plate 201 is first attached to the outer wall of the cavity 1, and then the input fixing plate 201 is fixedly connected to the cavity 1 by the input fixing screw 202 to complete the installation of the input connector 2. Similarly, the output fixing plate 301 can be installed on the top outer wall of the cavity 1 by the output fixing screw 302, thereby facilitating the input and output of signals.

[0028] Reference Figures 1-9 Multiple resonant rods 4 and resonant blocks 401 are provided. Multiple baffles 404 are provided in the cavity 1. The multiple resonant blocks 401 are separated by the baffles 404. The baffles 404 can separate the multiple resonant blocks 401, so that they can work independently. This makes the multiple first frequency tuning screws 5 and second frequency tuning screws 502 easy to use. A bidirectional tuning structure can be realized on the side and top surface. The frequency can be tuned on both sides to achieve the frequency reduction effect. Moreover, the insertion depth of the first frequency tuning screws 5 and second frequency tuning screws 502 into the resonant blocks 401 is adjustable, which can adjust different coupling values ​​and thus affect the performance of the filter to adapt to different application requirements.

[0029] Reference Figure 5 The input connector 2 is provided with an input core rod 203, and the output connector 3 is provided with an output core rod 303. The input core rod 203 is welded to the lowest resonant rod 4, and the output core rod 303 is welded to the uppermost resonant rod 4.

[0030] By welding the input connector 2 and the output connector 3 to the resonant rod 4, the stability and reliability of the filter can be improved, and the loss during signal transmission can be reduced. Furthermore, welding makes the connection between the input core rod 203 and the output core rod 303 and the resonant rod 4 more robust, which helps to reduce signal reflection and loss caused by poor connection, thereby improving the overall performance of the filter. Example

[0031] Reference Figures 1-9 An ultra-low frequency filter structure includes a cavity 1, characterized in that it further includes an output connector 3 and an input connector 2 connected to the upper and lower ends of the cavity 1; a resonant rod 4 fixedly connected to the inner wall of the cavity 1, and a resonant block 401 fixedly connected to the resonant rod 4; a first frequency tuning screw 5 threadedly connected to the side of the cavity 1, one end of the first frequency tuning screw 5 placed inside the cavity 1 cooperating with the resonant block 401; a tuning screw 105 threadedly connected to the side of the cavity 1 away from the first frequency tuning screw 5; a cover plate 101 is also provided on the cavity 1, and a second frequency tuning screw 502 is provided on the cover plate 101, one end of the second frequency tuning screw 502 placed inside the cavity 1 cooperating with the resonant block 401.

[0032] Reference Figure 3 and Figure 4 The resonant block 401 is provided with a first transverse groove 402 and a second transverse groove 403 that are connected. The first frequency tuning screw 5 is inserted into the second transverse groove 403, and the second frequency tuning screw 502 is inserted into the first transverse groove 402.

[0033] Reference Figures 1-9 A first tuning nut 501 is threaded onto the first frequency tuning screw 5, and a second tuning nut 503 is threaded onto the second frequency tuning screw 502. The first tuning nut 501 abuts against the side wall of the cavity 1, and the second tuning nut 503 abuts against the outer wall of the cover plate 101.

[0034] In this embodiment, during use, the depth of the first frequency tuning screw 5 inserted into the second transverse groove 403 can be adjusted, and then fixed by the first tuning nut 501. Similarly, the depth of the second frequency tuning screw 502 within the first transverse groove 402 can be adjusted, and then fixed by the second tuning nut 503. This allows for adjustment of the filter's performance to adapt to different application requirements, achieving different coupling values. Furthermore, a bidirectional coupling structure is adopted on the side and top surfaces to reduce the frequency. Increasing the number of coupling screws 5 and 502 allows for a wider window coupling tuning range.

[0035] Reference Figures 6-9 The resonant rod 4 has a connecting hole 405 at one end away from the resonant block 401. The outer wall of the cavity 1 has a countersunk hole 104. The tuning screw 105 is connected in the countersunk hole 104. The end of the tuning screw 105 that passes through the cavity 1 is threaded into the connecting hole 405.

[0036] The resonant rod 4 can be fixed by the tuning screw 105 through the connection hole 405 and the countersunk hole 104, making the connection more stable and easier to use and operate.

[0037] Reference Figures 6-9 The cover plate 101 is provided with a coupling tuning screw 504, and a coupling tuning nut 505 is threadedly connected to the coupling tuning screw 504. The coupling tuning nut 505 abuts against the top outer wall of the cover plate 101. The coupling tuning screw 504 is inserted into the cavity 1. There are multiple coupling tuning screws 504 and multiple coupling tuning nuts 505. The ends of the multiple coupling tuning screws 504 placed in the cavity 1 are all set between two adjacent resonant rods 4.

[0038] In this embodiment, a coupling tuning screw 504 is also provided on the cover plate 101, which can adjust the coupling value of the cavity 1. The coupling tuning screw 504 can be inserted into the cavity 1 to different depths. During operation, the position of the coupling tuning screw 504 on the cover plate 101 is directly adjusted to adjust the insertion depth of the coupling tuning screw 504 into the cavity 1. Then, it is fixed by the coupling tuning nut 505, so that different coupling effects can be easily adjusted, which is convenient for use in different occasions or under different requirements.

[0039] Reference Figure 3 and Figure 6 The cavity 1 is provided with a mounting hole 103, and the cover plate 101 is provided with a locking screw 102. The locking screw 102 passes through the cover plate 101 and is threaded into the mounting hole 103.

[0040] In this embodiment, when installing the cover plate 101, the cover plate 101 is first connected to the cavity 1, and then the locking screw 102 is connected so that it passes through the cover plate 101 and is connected in the mounting hole 103, thereby fixing the cover plate 101, enhancing the fixing effect, ensuring the sealing effect of the cavity 1, and making it easier to use.

[0041] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An ultra-low frequency filter structure, comprising a cavity (1), characterized in that, Also includes: The output connector (3) and input connector (2) are connected to the upper and lower ends of the cavity (1); A resonant rod (4) is fixedly connected to the inner wall of the cavity (1), and a resonant block (401) is fixedly connected to the resonant rod (4). A first frequency tuning screw (5) is threaded to the side of the cavity (1), and one end of the first frequency tuning screw (5) placed inside the cavity (1) is engaged with the resonant block (401); The tuning screw (105) is threaded onto the side of the cavity (1) away from the first frequency tuning screw (5); A cover plate (101) is provided on the cavity (1). A second frequency tuning screw (502) is provided on the cover plate (101). One end of the second frequency tuning screw (502) is placed inside the cavity (1) and cooperates with the resonant block (401).

2. The ultra-low frequency filter structure according to claim 1, characterized in that, The input connector (2) is provided with an input fixing plate (201), and an input fixing screw (202) is connected to the input fixing plate (201). The end of the input fixing screw (202) passing through the input fixing plate (201) is threaded onto the cavity (1).

3. The ultra-low frequency filter structure according to claim 2, characterized in that, The output connector (3) is provided with an output fixing plate (301), and an output fixing screw (302) is connected to the output fixing plate (301). The output fixing screw (302) passes through the output fixing plate (301) and is threaded onto the cavity (1).

4. The ultra-low frequency filter structure according to claim 3, characterized in that, The resonant rod (4) and the resonant block (401) are provided in multiple ways, and multiple baffles (404) are provided in the cavity (1). The multiple resonant blocks (401) are separated by the baffles (404).

5. The ultra-low frequency filter structure according to claim 4, characterized in that, The input connector (2) is provided with an input core rod (203), and the output connector (3) is provided with an output core rod (303). The input core rod (203) is welded to the lowest resonant rod (4), and the output core rod (303) is welded to the uppermost resonant rod (4).

6. The ultra-low frequency filter structure according to claim 1, characterized in that, The resonant block (401) is provided with a first transverse groove (402) and a second transverse groove (403) that are connected to each other. The first frequency tuning screw (5) is inserted into the second transverse groove (403), and the second frequency tuning screw (502) is inserted into the first transverse groove (402).

7. The ultra-low frequency filter structure according to claim 6, characterized in that, The first frequency tuning screw (5) is threaded with a first tuning nut (501), and the second frequency tuning screw (502) is threaded with a second tuning nut (503). The first tuning nut (501) abuts against the side wall of the cavity (1), and the second tuning nut (503) abuts against the outer wall of the cover plate (101).

8. The ultra-low frequency filter structure according to claim 7, characterized in that, The resonant rod (4) has a connecting hole (405) at one end away from the resonant block (401), and a countersunk hole (104) is provided on the outer wall of the cavity (1). The tuning screw (105) is connected in the countersunk hole (104), and the end of the tuning screw (105) passing through the cavity (1) is threaded into the connecting hole (405).

9. The ultra-low frequency filter structure according to claim 8, characterized in that, The cover plate (101) is provided with a coupling tuning screw (504), and a coupling tuning nut (505) is threaded onto the coupling tuning screw (504). The coupling tuning nut (505) abuts against the top outer wall of the cover plate (101). The coupling tuning screw (504) is inserted into the cavity (1). There are multiple coupling tuning screws (504) and coupling tuning nuts (505). One end of each of the multiple coupling tuning screws (504) placed in the cavity (1) is positioned between two adjacent resonant rods (4).

10. The ultra-low frequency filter structure according to claim 9, characterized in that, The cavity (1) is provided with a mounting hole (103), and the cover plate (101) is provided with a locking screw (102). The locking screw (102) passes through the cover plate (101) and is threaded into the mounting hole (103).

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