Band-stop filter frequency double-tuned structure

Abstract

The present invention discloses a frequency double tuning structure of a band-stop filter, which belongs to the field of filters. The frequency double tuning structure of a band-stop filter comprises a cavity, wherein a cavity is provided, and a band-stop main transmission copper sheet is provided in the cavity; the outer walls on both sides of the cavity are respectively provided with an input connector and an output connector; the cover plate is provided with a coupling degree tuning screw matched with the first circular hole; the bottom outer wall of the cavity is provided with a second circular hole matched with a resonant column, and a frequency coupling degree auxiliary tuning screw is connected in the second circular hole, and the side wall of the cavity is provided with an auxiliary screw corresponding to the resonant column; the present invention avoids affecting the coupling degree of a single cavity by adding a tuning auxiliary screw to the side of a single resonant cavity and extending into the interior of the single cavity. This design is easy to implement, simple in structure, and easy to control, and the design deficiencies can be compensated by the auxiliary tuning screw, greatly increasing the debugging speed.

Description

Technical Field

[0001] The invention relates to the technical field of filters, and in particular to a frequency double-tuning structure of a band-stop filter. Background Art

[0002] In the design and debugging process of band-stop filter, the frequency tuning screw often affects the coupling index during debugging due to its position. Since the frequency and coupling of each single cavity must be within the specified range to pass the debugging, the frequency can only be changed by modifying the height of the resonant column in the previous debugging process, which leads to longer debugging sample time and increased uncertainty. In addition, the structure is complex, difficult to control, and the debugging speed is slow. Therefore, a band-stop filter frequency double tuning structure is proposed, which is easy to implement, simple in structure, easy to control, and can make up for the shortcomings of the existing design through auxiliary tuning screws, thereby greatly increasing the debugging speed and cost. Summary of the invention

[0003] The purpose of the present invention is to solve the problem of many uncertain factors in the prior art and to propose a frequency double-tuning structure of a band-stop filter.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] The band-stop filter frequency double-tuned structure comprises a cavity, a cavity is provided on the cavity, and a band-stop main transmission copper sheet is provided in the cavity;

[0006] The outer walls on both sides of the cavity are respectively provided with an input connector and an output connector;

[0007] A resonant column is also provided in the cavity, a first circular hole is provided on the resonant column, a cover plate is provided on the top outer wall of the cavity, and a coupling degree tuning screw matching the first circular hole is provided on the cover plate;

[0008] The bottom outer wall of the cavity is provided with a second circular hole matched with the resonant column, the second circular hole is connected with a frequency coupling auxiliary tuning screw, and the side wall of the cavity is provided with an auxiliary screw corresponding to the resonant column.

[0009] Preferably, the cover plate and the top outer wall of the cavity are both provided with corresponding first threaded holes, a first fastening screw is threadedly connected to the first threaded hole, and the cover plate and the cavity are fixedly connected by the first fastening screw.

[0010] Preferably, both end side walls of the cavity are provided with second threaded holes, and the second threaded holes are respectively connected with input fixing screws and output fixing screws, and the input connector and output connector are respectively connected to the outer wall of the cavity through the input fixing screws and the output fixing screws.

[0011] Preferably, a first fixing rod matched with the band-stop main transmission copper sheet is connected inside the input connector, and a second fixing rod matched with the band-stop main transmission copper sheet is connected inside the output connector.

[0012] Preferably, the outer wall of the cover plate is further provided with a third threaded hole, and the coupling degree tuning screw is threadedly connected in the third threaded hole.

[0013] Preferably, a fixing plate is fixedly connected to the inner wall of the cavity, a groove is provided on the fixing plate, and the band-stop main transmission copper sheet is placed in the groove.

[0014] Preferably, the band-stop main transmission copper sheet is connected with a copper sheet fixing screw, and the copper sheet fixing screw is threadedly connected to the fixing plate.

[0015] Preferably, the inner wall of the groove is connected with a support member, the support member is against the bottom outer wall of the band-blocking main transmission copper sheet, and the support member is sleeved on the outer wall of the copper sheet fixing screw.

[0016] Preferably, a plurality of the first threaded holes are provided, and a first fastening screw is threadedly connected in each of the plurality of first threaded holes. A plurality of groups of the resonant columns are provided, and the plurality of groups of the resonant columns are evenly distributed in the cavity.

[0017] Preferably, the copper sheet fixing screws and the supporting member are made of non-conductive dielectric materials.

[0018] Compared with the prior art, the present invention provides a band-stop filter frequency double tuning structure, which has the following beneficial effects:

[0019] 1. The frequency double tuning structure of the band-stop filter, when in use, fixes the input connector and the output connector to the side wall of the cavity, and then fixes them by the input fixing screw and the output fixing screw, connects the band-stop main transmission copper sheet to the groove on the fixed plate in the cavity, connects the first fixing rod and the second fixing rod to the band-stop main transmission copper sheet, and then places the support between the groove and the band-stop main transmission copper sheet, fixes it by the copper sheet fixing screw, so that the band-stop main transmission copper sheet can be fixedly connected, and then connects the coupling degree tuning screw, the frequency coupling degree auxiliary tuning screw and the auxiliary screw respectively, and adds a frequency coupling degree auxiliary tuning screw at a position facing the middle of the resonant column and away from the band-stop main transmission copper sheet on the side of the cavity, so that the frequency can be tuned within a certain range without affecting the coupling degree of each cavity. The structure is simple and easy to implement, and solves the problem that the frequency coupling degree auxiliary tuning screw affects the coupling degree of a single cavity during the debugging process of the band-stop filter, thereby causing difficulty in debugging and a long debugging time span, and increases the characteristics of stability, consistency, reliability, operability, low cost, etc.

[0020] The parts not involved in the device are the same as the prior art or can be implemented by using the prior art. The present invention adds a tuning auxiliary screw on the side of a single resonant cavity and extends deep into the single cavity. The position is required to be in the middle of the resonant column and away from the band-stop main transmission copper sheet, so as to avoid affecting the coupling degree of the single cavity. This design is easy to implement, simple in structure, and easy to control. The auxiliary tuning screw can also be used to make up for the design deficiencies, thereby greatly increasing the debugging speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a three-dimensional structural schematic diagram of the frequency double-tuning structure of the band-stop filter proposed by the present invention;

[0022] Figure 2 This is a structural schematic diagram of the bottom of the band-stop filter frequency double-tuning structure proposed by the present invention;

[0023] Figure 3 The schematic diagram of the band-stop filter frequency double-tuning structure proposed by the present invention is a top view of the structure Figure 1 ;

[0024] Figure 4 The schematic diagram of the band-stop filter frequency double-tuning structure proposed by the present invention is a top view of the structure Figure 2 ;

[0025] Figure 5 The double-tuned structure of the band-stop filter frequency proposed by the present invention Figure 4 Schematic diagram of the structure of the AA section;

[0026] Figure 6 This is a schematic structural diagram of the main view of the frequency double tuning structure of the band-stop filter proposed by the present invention.

[0027] In the figure: 1, cover plate; 2, cavity; 201, cavity; 202, first threaded hole; 203, resonant column; 204, first circular hole; 205, second circular hole; 206, fixing plate; 3, input connector; 301, first fixing rod; 4, input fixing screw; 5, output connector; 501, second fixing rod; 6, output fixing screw; 7, band-stop main transmission copper sheet; 8, copper sheet fixing screw; 9, support; 10, first fastening screw; 11, coupling degree tuning screw; 12, frequency coupling degree auxiliary tuning screw; 13, auxiliary screw. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0029] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0030] Example:

[0031] Reference Figure 1-6 , a band-stop filter frequency double-tuned structure, comprising a cavity 2, a cavity 201 is provided on the cavity 2, and a band-stop main transmission copper sheet 7 is provided in the cavity 201;

[0032] The outer walls on both sides of the cavity 2 are respectively provided with an input connector 3 and an output connector 5;

[0033] A resonant column 203 is also provided in the cavity 2, and a first circular hole 204 is provided on the resonant column 203. A cover plate 1 is provided on the top outer wall of the cavity 2, and a coupling degree tuning screw 11 matching with the first circular hole 204 is provided on the cover plate 1.

[0034] The bottom outer wall of the cavity 2 is provided with a second circular hole 205 matched with the resonant column 203 , and the second circular hole 205 is connected with a frequency coupling auxiliary tuning screw 12 . The side wall of the cavity 2 is provided with an auxiliary screw 13 corresponding to the resonant column 203 .

[0035] The cover plate 1 and the top outer wall of the cavity 2 are both provided with corresponding first threaded holes 202 , and the first threaded holes 202 are internally threadedly connected with first fastening screws 10 . The cover plate 1 and the cavity 2 are fixedly connected by the first fastening screws 10 .

[0036] Reference Figure 1 , Figure 2 , Figure 3 and Figure 4 The side walls at both ends of the cavity 2 are provided with a second threaded hole, and the second threaded holes are respectively connected with an input fixing screw 4 and an output fixing screw 6. The input connector 3 and the output connector 5 are respectively connected to the outer wall of the cavity 2 through the input fixing screw 4 and the output fixing screw 6. The input connector 3 and the output connector 5 can be fixedly connected through the input fixing screw 4 and the output fixing screw 6, making it convenient to use.

[0037] Reference Figure 3 and Figure 5 A first fixing rod 301 matching with the band-stop main transmission copper sheet 7 is connected inside the input connector 3, and a second fixing rod 501 matching with the band-stop main transmission copper sheet 7 is connected inside the output connector 5.

[0038] Reference Figure 1 and Figure 4 The outer wall of the cover plate 1 is also provided with a third threaded hole, and the coupling degree tuning screw 11 is threadedly connected in the third threaded hole. The coupling degree tuning screw 11 can be easily installed and removed through the third threaded hole.

[0039] Reference Figure 3 A fixing plate 206 is fixedly connected to the inner wall of the cavity 201. A groove is provided on the fixing plate 206. The band-blocking main transmission copper sheet 7 is placed in the groove, so that the band-blocking main transmission copper sheet 7 is easy to install.

[0040] Reference Figure 3 The band-blocking main transmission copper sheet 7 is connected with a copper sheet fixing screw 8, which is threadedly connected to the fixing plate 206. The copper sheet fixing screw 8 can make the connection of the band-blocking main transmission copper sheet 7 more stable.

[0041] Reference Figure 5 The inner wall of the groove is connected with a support member 9, which abuts against the bottom outer wall of the main transmission copper sheet 7 with a band-blocking function. The support member 9 is sleeved on the outer wall of the copper sheet fixing screw 8. The support member 9 can support the main transmission copper sheet 7 with a band-blocking function to avoid damage to it.

[0042] Reference Figure 1-6 There are multiple first threaded holes 202, each of which is threadedly connected with a first fastening screw 10; there are multiple groups of resonant columns 203, and the multiple groups of resonant columns 203 are evenly distributed in the cavity 201; multiple first threaded holes 202 are connected with the first fastening screws 10 to make the connection of the cover plate 1 more stable.

[0043] The copper sheet fixing screws 8 and the supporting member 9 are both made of non-conductive dielectric materials, which is convenient for operation.

[0044] In the present invention, when in use, the input connector 3 and the output connector 5 are fixedly connected to the side wall of the cavity 2, and then fixed by the input fixing screw 4 and the output fixing screw 6, the band-stop main transmission copper sheet 7 is connected to the groove on the fixed plate 206 in the cavity 201, so that the first fixing rod 301 and the second fixing rod 501 are connected to the band-stop main transmission copper sheet 7, and then the support member 9 is placed between the groove and the band-stop main transmission copper sheet 7, and it is fixed by the copper sheet fixing screw 8, so that the band-stop main transmission copper sheet 7 can be fixedly connected, and then the coupling degree tuning screw 11 and the frequency tuning screw 12 are respectively connected. A coupling degree auxiliary tuning screw 12 and an auxiliary screw 13 are used. A frequency coupling degree auxiliary tuning screw 12 is added to the side of the cavity 2 facing the middle of the resonant column 203 and away from the band-stop main transmission copper plate 7 to achieve frequency tuning within a certain range without affecting the coupling degree of each cavity. The structure is simple and easy to implement. The problem of difficulty in debugging and long debugging time span caused by the influence of the frequency coupling degree auxiliary tuning screw 12 on the coupling degree of a single cavity during the debugging process of the band-stop filter is solved, and the characteristics of stability, consistency, reliability, operability, low cost, etc. are increased.

[0045] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A band-stop filter frequency double-tuned structure, comprising a cavity (2), characterized in that: The cavity (2) is provided with a cavity (201), and a band-stop main transmission copper sheet (7) is provided in the cavity (201); The outer walls on both sides of the cavity (2) are respectively provided with an input connector (3) and an output connector (5); A resonant column (203) is further provided in the cavity (2), a first circular hole (204) and a third circular hole are provided on the resonant column (203), the axes of the first circular hole and the third circular hole do not overlap, a cover plate (1) is provided on the top outer wall of the cavity (2), and a coupling degree tuning screw (11) matching the first circular hole (204) is provided on the cover plate (1); The outer wall of the bottom of the cavity (2) is provided with a second circular hole (205) matching with the third circular hole on the resonance column (203), and the side wall of the cavity (2) is provided with an auxiliary screw (13) corresponding to the resonance column (203); The band-stop main transmission copper sheet (7) is located above the resonant column (203), the frequency coupling auxiliary tuning screw (12) passes through the second circular hole (205) and is connected to the third circular hole, and the frequency coupling auxiliary tuning screw (12) is located below the band-stop main transmission copper sheet (7).

2. The band-stop filter frequency double-tuning structure according to claim 1, characterized in that: The cover plate (1) and the top outer wall of the cavity (2) are both provided with corresponding first threaded holes (202), the first threaded holes (202) are internally threadedly connected with first fastening screws (10), and the cover plate (1) and the cavity (2) are fixedly connected via the first fastening screws (10).

3. The band-stop filter frequency double-tuned structure according to claim 2, characterized in that: The side walls at both ends of the cavity (2) are provided with second threaded holes, and the second threaded holes are respectively connected to an input fixing screw (4) and an output fixing screw (6), and the input connector (3) and the output connector (5) are respectively connected to the outer wall of the cavity (2) via the input fixing screw (4) and the output fixing screw (6).

4. The band-stop filter frequency double-tuned structure according to claim 3, characterized in that: The input connector (3) is internally connected to a first fixing rod (301) that matches the band-stop main transmission copper sheet (7), and the output connector (5) is internally connected to a second fixing rod (501) that matches the band-stop main transmission copper sheet (7).

5. The band-stop filter frequency double-tuning structure according to claim 2, characterized in that: The outer wall of the cover plate (1) is also provided with a third threaded hole, and the coupling degree tuning screw (11) is threadedly connected in the third threaded hole.

6. The band-stop filter frequency double-tuning structure according to claim 1, characterized in that: A fixing plate (206) is fixedly connected to the inner wall of the cavity (201), the fixing plate (206) is provided with a groove, and the band-stop main transmission copper sheet (7) is placed in the groove.

7. The band-stop filter frequency double-tuning structure according to claim 6, characterized in that: The band-stop main transmission copper sheet (7) is connected to a copper sheet fixing screw (8), and the copper sheet fixing screw (8) is threadedly connected to the fixing plate (206).

8. The band-stop filter frequency double-tuning structure according to claim 7, characterized in that: The inner wall of the groove is connected to a support member (9), the support member (9) abuts against the bottom outer wall of the band-blocking main transmission copper sheet (7), and the support member (9) is sleeved on the outer wall of the copper sheet fixing screw (8).

9. The band-stop filter frequency double-tuned structure according to claim 2, characterized in that: A plurality of the first threaded holes (202) are provided, each of the plurality of first threaded holes (202) being threadedly connected with a first fastening screw (10), and a plurality of groups of the resonant columns (203) are provided, the plurality of groups of the resonant columns (203) being evenly distributed in the cavity (201).

10. The band-stop filter frequency double-tuning structure according to claim 8, characterized in that: The copper sheet fixing screw (8) and the support member (9) are both made of non-conductive dielectric materials.

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