Large-range coupling adjustable structure of band elimination filter

Abstract

The invention discloses a large-range coupling adjustable structure of a band elimination filter, and belongs to the field of band elimination filters. A large-range coupling adjustable structure of a band elimination filter comprises a cavity and further comprises an input connector and an output connector which are arranged on the outer walls of the two sides of the cavity respectively. The cover plate is arranged on the cavity, and a plurality of groups of frequency tuning screws are arranged on the cover plate; the plurality of groups of resonant columns are fixedly connected in the cavity, and the plurality of groups of resonant columns are respectively matched with the plurality of groups of frequency tuning screws; the copper sheet is arranged in the cavity, and the two ends of the copper sheet are matched with the input connector and the output connector respectively; the auxiliary tuning screw is arranged on the cover plate, and the bottom of the auxiliary tuning screw penetrates through the cover plate and is arranged in the cavity; according to the invention, the problems of difficult design and debugging, long debugging time span and the like of the band elimination filter in the design, assembly and debugging process are solved, and the characteristics of stability, consistency, reliability, operability, low cost and the like are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of band-stop filter, in particular to a large-range coupling adjustable structure of band-stop filter. BACKGROUND

[0002] The band-stop filter is a kind of filter that can suppress or attenuate signals in a specific frequency band, while allowing signals outside the frequency band to pass relatively smoothly. From the perspective of frequency response, in the stop band (the frequency band to be suppressed), the amplitude of the signal will be greatly attenuated; while in the passband (the frequency band allowed to pass), the signal can pass with little or only a little loss.

[0003] In the process of communication filter design and debugging, the conventional band-pass filter often cannot meet the requirements due to strict indicators, so the band-stop form is used for design, but the bandwidth is relatively wide, the debugging is relatively sensitive, the processing precision and assembly precision are relatively high, the debugging is difficult; and since the coupling value of each individual resonant cavity in the band-stop design is fixed, the coupling value cannot be changed in the debugging stage, so the difficulty increases during debugging, the debugging time increases due to repeated disassembly, in addition, the assembly precision and processing precision are relatively high, so the processing cost and production cost cannot be effectively controlled, resulting in a large increase in cost. Therefore, the present application is proposed. SUMMARY

[0004] The purpose of the present application is to solve the problems in the prior art and provide a large-range coupling adjustable structure of band-stop filter.

[0005] In order to achieve the above-mentioned purpose, the present application adopts the following technical scheme: A large-range coupling adjustable structure of band-stop filter, comprising a cavity, further comprising: An input connector and an output connector are arranged on the two side walls of the cavity respectively; A cover plate is arranged on the cavity, and a plurality of frequency tuning screws are arranged on the cover plate; A plurality of resonant columns are fixedly connected in the cavity, and the plurality of resonant columns are matched with the plurality of frequency tuning screws respectively; A copper sheet is arranged in the cavity, and the two ends of the copper sheet are matched with the input connector and the output connector respectively; An auxiliary tuning screw is arranged on the cover plate, and the bottom of the auxiliary tuning screw penetrates through the cover plate and is placed in the cavity.

[0006] Preferably, two vertical plates are arranged in the cavity, the two vertical plates and the inner wall of the cavity combine to divide the cavity into three placement areas, and three resonant columns are arranged in the three placement areas respectively.

[0007] Further, the resonant column is provided with a circular hole, the frequency tuning screw is provided with three, the frequency tuning nut is arranged on the three frequency tuning screws, the frequency tuning nut is in abutment with the top outer wall of the cover plate, and the bottom of the three frequency tuning screws penetrates through the cover plate and extends into the circular hole on the resonant column.

[0008] Further, the auxiliary tuning screw is provided with three, the auxiliary tuning nut is connected to the three auxiliary tuning screws, the auxiliary tuning nut is in abutment with the top outer wall of the cover plate, and the bottom of the auxiliary tuning screw is not inserted into the circular hole on the resonant column.

[0009] Preferably, the input joint is connected with an input fixing plate, the input fixing plate is connected with an input fixing screw, and the input fixing plate is connected to the outer wall of the cover plate through the input fixing screw.

[0010] Further, the output joint is connected with an output fixing plate, the output fixing plate is provided with an output fixing screw, and the output fixing plate is connected to the outer wall of the side of the cover plate away from the input joint through the output fixing screw.

[0011] Further, the input joint is provided with an input core rod, the output joint is provided with an output core rod, both ends of the copper sheet are provided with a welding groove, and the input core rod and the output core rod are respectively welded and connected to the welding grooves at both ends of the copper sheet.

[0012] Preferably, the stand plate is provided with a groove, the support is fixedly connected in the groove, the copper sheet is mounted on the support, the copper sheet is connected with a mounting screw, and the bottom of the mounting screw is connected to the stand plate.

[0013] Further, the support and the mounting screw are both non-metal parts, the copper sheet is provided with a circular arc groove, and the circular arc groove is concentrically arranged with the auxiliary tuning screw.

[0014] Preferably, the cavity and the stand plate are integrally formed, the top outer wall of the cavity and the top outer wall of the stand plate are both provided with a threaded hole, the cover plate is connected with a locking screw, and the locking screw penetrates through the cover plate and is connected into the threaded hole.

[0015] Compared with the prior art, the present application provides a large-range coupling adjustable structure of a band-stop filter, which has the following beneficial effects: 1. The wide-range coupling adjustable structure of the band-stop filter, through fine simulation of the coupling degree of each placement area according to different coupling values in the design stage, comparing the simulated value with the required value during simulation, and enhancing or weakening the coupling value through the auxiliary tuning screw added on the cover plate after simulating a relatively weak coupling value, the product index is realized, the design is easy to realize, the structure is simple, easy to control, and the design deficiency can be made up through the auxiliary tuning screw, which greatly increases the debugging speed and cost, the adjustment mode of the auxiliary tuning screw is the same as that of the frequency tuning screw, and the coupling value is enhanced or weakened by adjusting the position in the cavity.

[0016] 2. The wide-range coupling adjustable structure of the band-stop filter, the support is made of PEI material, and the mounting screw is made of PEEK material, which supports and positions the copper sheet, the non-metal material has good electrical insulation, and will not introduce additional electromagnetic interference or change the electromagnetic environment of the copper sheet during use, in the filter which is sensitive to the electromagnetic environment and needs to accurately control the signal transmission and filtering effect, the non-metal part will not interfere with the electrical path between the copper sheet and the input core rod and the output core rod, which helps to maintain stable signal transmission state and ensure normal realization of filtering function.

[0017] The parts not involved in the device are the same as or can be realized by the prior art, the present application solves the problems of difficult design and debugging, long debugging time span and the like of the band-stop filter in the design, assembly and debugging process, and increases stability, consistency, reliability, operability, low cost and the like. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 A structure diagram of a wide-range coupling adjustable structure of a band-stop filter is proposed for the present application; Figure 2 A structure diagram of a wide-range coupling adjustable structure of a band-stop filter is proposed for the present application; Figure 1 ; Figure 3 A structure diagram of a wide-range coupling adjustable structure of a band-stop filter is proposed for the present application; Figure 2 ; Figure 4 A structure diagram of a wide-range coupling adjustable structure of a band-stop filter is proposed for the present application; Figure 5 A structure diagram of a wide-range coupling adjustable structure of a band-stop filter is proposed for the present application; Figure 6 A structure diagram of a wide-range coupling adjustable structure of a band-stop filter is proposed for the present application; Figure 7A structure diagram of a copper sheet in a wide-range coupling adjustable structure of a band-stop filter is provided.

[0019] In the figure: 1, cavity; 101, threaded hole; 102, vertical plate; 103, groove; 104, support; 105, placement area; 106, resonance column; 107, round hole; 2, input fixed plate; 201, input connector; 202, input fixing screw; 203, input core rod; 3, output fixed plate; 301, output connector; 302, output fixing screw; 303, output core rod; 4, cover plate; 401, locking screw; 5, frequency tuning screw; 501, auxiliary tuning screw; 502, frequency tuning nut; 503, auxiliary tuning nut; 6, copper sheet; 601, mounting screw; 602, welding groove; 603, circular arc groove. DETAILED DESCRIPTION

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

[0021] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0022] Embodiment one: refer to Figures 1-7 A wide-range coupling adjustable structure of a band-stop filter, comprising a cavity 1, further comprising an input connector 201 and an output connector 301, which are respectively arranged on the two side outer walls of the cavity 1, a cover plate 4 is arranged on the cavity 1, and the cover plate 4 is provided with a plurality of frequency tuning screws 5, a plurality of resonance columns 106 are fixedly connected in the cavity 1, and the plurality of resonance columns 106 are matched with the plurality of frequency tuning screws 5; a long strip-shaped copper sheet 6 is further arranged in the cavity 1, and the two ends of the copper sheet 6 are matched with the input connector 201 and the output connector 301 respectively; an auxiliary tuning screw 501 is arranged on the cover plate 4, and the bottom of the auxiliary tuning screw 501 penetrates through the cover plate 4 and is placed in the cavity 1.

[0023] In this embodiment, the different coupling values of the product are realized by adding auxiliary tuning screws 501 on the cover plate 4, so as to realize the customer index. In the early design stage, the coupling degree of each placement area 105 can be simulated in detail according to different coupling values. The simulated value is compared with the required value. After a relatively weak coupling value is simulated, the coupling value is enhanced or weakened through the auxiliary tuning screws 501 added on the cover plate 4, so as to realize the product index. This design is easy to realize, simple in structure, easy to control, and can compensate for design deficiencies through the auxiliary tuning screws 501, greatly increasing the debugging speed and cost.

[0024] Specifically, in use, first, the input joint 201 stably and reliably introduces the to-be-processed signal containing various frequency components into the filter. Different signal sources and transmission lines have different impedances. The input joint 201 can realize impedance matching between the signal source and the connecting cable, reduce signal reflection in the transmission process, improve signal transmission efficiency, and avoid signal power loss. Then, the copper sheet 6 can transmit the electrical signal from the input joint 201 to the internal circuit of the filter with minimal resistance loss, so as to be transmitted to the subsequent circuit efficiently and stably. Moreover, the signal transmission process can be effectively reduced through the arrangement of the copper sheet 6, so that the impedance of the input joint 201 and the output joint 301 can be better matched with the internal circuit and the subsequent circuit of the filter, the reflection coefficient is reduced, the signal can pass through the filter more smoothly, and the copper sheet 6 has good electromagnetic shielding performance, which can block external electromagnetic interference signals from entering the filter to a certain extent, avoid the adverse effects of interference signals on the filtering process, prevent internal signal leakage, and filter out signals of specific frequency band interference signals after the band-stop filter processing, and then transmit the signals to the subsequent circuit or equipment through the output joint 301.

[0025] The resonant column 106 is a key electromagnetic element in the band-stop filter, which can form a resonant circuit together with other elements. When the signal frequency is the same as the inherent resonant frequency of the resonant column 106, resonance occurs. At this time, the resonant column 106 presents high impedance characteristics to the signal of the frequency, thereby greatly attenuating the signal of the frequency and realizing the function of band-stop filtering. The frequency tuning screw 5 can change the electromagnetic environment around the resonant column 106, thereby fine-tuning the resonant frequency of the resonant column 106.

[0026] Embodiment two: refer to Figures 1-7The application discloses a wide-range coupling adjustable structure of a band elimination filter, which comprises a cavity 1, an input joint 201 and an output joint 301 arranged on two lateral walls of the cavity 1 respectively, a cover plate 4 arranged on the cavity 1, a plurality of frequency tuning screws 5 arranged on the cover plate 4, a plurality of resonance columns 106 fixedly connected in the cavity 1 and matched with the plurality of frequency tuning screws 5 respectively, and a long strip-shaped copper sheet 6 arranged in the cavity 1 and matched with the input joint 201 and the output joint 301 respectively.

[0027] With reference to Figures 2-4 Two vertical plates 102 are arranged in the cavity 1, the two vertical plates 102 and the inner wall of the cavity 1 combine to divide the cavity 1 into three placing areas 105, and three resonance columns 106 are arranged in the three placing areas 105 respectively.

[0028] With reference to Figures 2-4 The resonance column 106 is provided with a circular hole 107, three frequency tuning screws 5 are arranged, the three frequency tuning screws 5 are provided with frequency tuning nuts 502, the frequency tuning nuts 502 abut against the top outer wall of the cover plate 4, and the bottoms of the three frequency tuning screws 5 pass through the cover plate 4 and extend into the circular holes 107 on the resonance columns 106.

[0029] In the embodiment, the frequency tuning screw 5 can change the electromagnetic environment around the resonance column 106, and then finely tune the resonance frequency of the resonance column 106. When the frequency tuning screw 5 is screwed, it can be close to or far away from the circular hole 107 on the resonance column 106, so that the electric field or magnetic field distribution around the resonance column 106 changes, which is equivalent to changing the inductance or capacitance parameters of the resonance circuit. Thus, the resonance frequency of the resonance column 106 can be finely adjusted in a certain range to adapt to different working requirements. The frequency tuning nut 502 can fix the frequency tuning screw 5, and the use is more convenient.

[0030] With reference to Figures 1-6 The auxiliary tuning screw 501 is provided with three auxiliary tuning nuts 503, the auxiliary tuning nuts 503 abut against the top outer wall of the cover plate 4, and the bottoms of the auxiliary tuning screws 501 are not inserted into the circular holes 107 on the resonance columns 106.

[0031] In the embodiment, in the preliminary design stage, the coupling degree of each placement area 105 can be simulated in detail according to different coupling values. The simulated value is compared with the required value. After a relatively weak coupling value is simulated, the coupling value is enhanced or weakened through the auxiliary tuning screw 501 added on the cover plate 4, so as to realize the product index. The design is easy to realize, simple in structure, easy to control, and can compensate for the design deficiency through the auxiliary tuning screw 501, greatly increasing the debugging speed and cost. Specifically, the adjustment mode of the auxiliary tuning screw 501 is the same as that of the frequency tuning screw 5. The coupling value is enhanced or weakened by adjusting the position of the auxiliary tuning screw 501 in the cavity 1. After adjustment, the auxiliary tuning nut 503 is used for fixing, which is convenient to use.

[0032] Embodiment three: Figures 1-7 A band-stop filter wide-range coupling adjustable structure includes a cavity 1, an input joint 201 and an output joint 301 arranged on the two side walls of the cavity 1 respectively, a cover plate 4 arranged on the cavity 1, a plurality of frequency tuning screws 5 arranged on the cover plate 4, a plurality of resonance columns 106 fixedly connected in the cavity 1 and matched with the plurality of frequency tuning screws 5 respectively, a long strip-shaped copper sheet 6 arranged in the cavity 1 and matched with the input joint 201 and the output joint 301 respectively, and an auxiliary tuning screw 501 arranged on the cover plate 4 and penetrating through the cover plate 4 and placed in the cavity 1.

[0033] Refer to Figures 1-4 The input joint 201 is connected with an input fixing plate 2, the input fixing plate 2 is connected with an input fixing screw 202, and the input fixing plate 2 is connected to the outer wall of the cover plate 4 through the input fixing screw 202.

[0034] Refer to Figures 1-4 The output joint 301 is connected with an output fixing plate 3, the output fixing plate 3 is provided with an output fixing screw 302, and the output fixing plate 3 is connected to the outer wall of the cover plate 4 away from the input joint 201 through the output fixing screw 302.

[0035] Refer to Figures 2-4 The input joint 201 is provided with an input core rod 203, the output joint 301 is provided with an output core rod 303, both ends of the copper sheet 6 are provided with welding grooves 602, and the input core rod 203 and the output core rod 303 are welded and connected in the welding grooves 602 at both ends of the copper sheet 6.

[0036] In this embodiment, during installation, first, the input fixing plate 2 is attached to one side of the cavity 1, then the input fixing plate 2 is fixed by the input fixing screw 202, thereby realizing the fixation of the input connector 201, then the output fixing plate 3 is attached to the other side of the cavity 1, the output fixing plate 3 is fixed by the output fixing screw 302, thereby realizing the fixation of the output connector 301, then the input connector 201 and the output connector 301 can realize the signal input and output operation of the filter.

[0037] In this application, mechanical fixation is adopted, which can ensure the firm connection between the input connector 201 and the output connector 301 and the cavity 1, can withstand certain external force, and can have certain protection performance by fixing the input fixing plate 2 and the output fixing plate 3, which can prevent dust, moisture and other external factors from entering the inside of the cavity 1 and affecting the normal work of the filter.

[0038] During work, the input connector 201 can realize the impedance matching between the signal source and the connecting cable, reduce the reflection of the signal in the transmission process, improve the transmission efficiency of the signal, and avoid the loss of signal power, then the electrical signal transmitted by the input connector 201 can be transmitted to the internal circuit of the filter with very small resistance loss through the copper sheet 6, then the signal processed by the filter is output through the output connector 301, thereby being transmitted to the subsequent circuit efficiently and stably, when the signal passes through the copper sheet 6, the setting of the copper sheet 6 can effectively reduce the reflection phenomenon in the signal transmission process, can make the impedance of the input connector 201 and the output connector 301 better match the internal circuit of the filter and the subsequent circuit, reduce the reflection coefficient, and make the signal pass through the filter more smoothly, the resonant column 106 can greatly attenuate the signal of this frequency, realize the function of band-stop filtering, and the frequency tuning screw 5 can change the electromagnetic environment around the resonant column 106, thereby fine-tuning the resonant frequency of the resonant column 106.

[0039] The input core rod 203 and the output core rod 303 are fixedly connected with the copper sheet 6 by welding, which can construct a stable and low-resistance electrical path, which can greatly reduce the power loss and distortion of the signal in the signal transmission process, make the input and output signals of the filter maintain the original characteristics as much as possible, and improve the quality and efficiency of signal transmission, and the copper sheet 6 has certain strength and toughness, which can enhance the stability of the core rod in the filter after being fixedly connected with the input core rod 203 and the output core rod 303 by welding.

[0040] Referring to Figure 4 The stand plate 102 is provided with a groove 103, the support 104 is fixedly connected in the groove 103, the copper sheet 6 is installed on the support 104, the mounting screw 601 is connected to the copper sheet 6, and the bottom of the mounting screw 601 is connected to the stand plate 102.

[0041] The groove 103 is arranged to facilitate the placement of the copper sheet 6 and better connect the input core rod 203 and the output core rod 303. The support 104 is arranged to support the copper sheet 6 and ensure the working effect. The mounting screw 601 is arranged to fix the copper sheet 6 and further realize stable transmission.

[0042] With reference to Figure 6 and Figure 7 , the support 104 and the mounting screw 601 are both non-metal parts. The copper sheet 6 is provided with a circular arc groove 603 which is concentrically arranged with the auxiliary tuning screw 501.

[0043] The support 104 is made of PEI material and the mounting screw 601 is made of PEEK material. The non-metal material has good electrical insulation and will not introduce additional electromagnetic interference or change the electromagnetic environment of the copper sheet 6. In the filter which is sensitive to the electromagnetic environment and needs to accurately control the signal transmission and filtering effect, the non-metal part will not interfere with the electrical path between the copper sheet 6 and the input core rod 203 and the output core rod 303, which helps to maintain a stable signal transmission state and ensure the normal realization of the filtering function.

[0044] With reference to Figures 1-6 , the cavity 1 and the vertical plate 102 are integrally formed. The top outer wall of the cavity 1 and the top outer wall of the vertical plate 102 are both provided with threaded holes 101. The cover plate 4 is connected with locking screws 401 which pass through the cover plate 4 and are connected in the threaded holes 101.

[0045] In the present application, the cover plate 4 is arranged to form a sealed chamber for the cavity 1, which facilitates the normal use of the filter. The multiple locking screws 401 are arranged to enhance the connection and sealing effect between the cover plate 4 and the cavity 1, avoid gas infiltration or leakage, and further facilitate use.

[0046] The above is only a preferred embodiment of the present application, but the protection scope of the present application is not limited thereto. Any skilled person in the art can make equivalent replacements or changes to the technical solution and the inventive concept of the present application within the technical scope disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A wide-range coupling adjustable structure of a band-stop filter comprising a cavity (1), characterized in that, Also include: Input joint (201) and output joint (301) are arranged on the two sides of the cavity (1) outer wall respectively; Cover plate (4) is arranged on the cavity (1), and a plurality of groups of frequency tuning screws (5) are arranged on the cover plate (4); A plurality of groups of resonance columns (106) are fixedly connected in the cavity (1), and a plurality of groups of the resonance columns (106) are matched with a plurality of groups of frequency tuning screws (5) respectively; Copper sheet (6) is arranged in the cavity (1), and the two ends of the copper sheet (6) are matched with the input joint (201) and the output joint (301) respectively; The auxiliary tuning screw (501) is arranged on the cover plate (4), and the bottom of the auxiliary tuning screw (501) penetrates through the cover plate (4) and is placed in the cavity (1).

2. The wide-range coupling adjustable structure of a bandstop filter according to claim 1, characterized in that, Two vertical plates (102) are arranged in the cavity (1), and the cavity (1) is divided into three placing areas (105) by the combination of the two vertical plates (102) and the inner wall of the cavity (1), and three resonance columns (106) are arranged in the three placing areas (105) respectively.

3. The wide-range coupling adjustable structure of a bandstop filter according to claim 2, characterized in that, The resonance column (106) is provided with a circular hole (107), the frequency tuning screw (5) is provided with three frequency tuning nuts (502), the frequency tuning nut (502) is matched with the top outer wall of the cover plate (4), and the bottom of the frequency tuning screw (5) penetrates through the cover plate (4) and extends into the circular hole (107) on the resonance column (106).

4. The wide-range coupling adjustable structure of a band-stop filter according to claim 3, characterized in that, The auxiliary tuning screw (501) is provided with three auxiliary tuning nuts (503), the auxiliary tuning nut (503) is matched with the top outer wall of the cover plate (4), and the bottom of the auxiliary tuning screw (501) is not inserted into the circular hole (107) on the resonance column (106).

5. The wide-range coupling adjustable structure of a bandstop filter according to claim 1, wherein, The input fixed plate (2) is connected to the input joint (201), the input fixed plate (2) is provided with an input fixed screw (202), and the input fixed plate (2) is connected to the outer wall of the cover plate (4) through the input fixed screw (202).

6. The wide-range coupling adjustable structure of a band-stop filter according to claim 5, wherein, The output fixed plate (3) is connected to the output joint (301), the output fixed plate (3) is provided with an output fixed screw (302), and the output fixed plate (3) is connected to the outer wall of the cover plate (4) away from the input joint (201) through the output fixed screw (302).

7. The wide-range coupling adjustable structure of a bandstop filter according to claim 6, characterized in that, The input core rod (203) is arranged on the input joint (201), the output core rod (303) is arranged on the output joint (301), the two ends of the copper sheet (6) are provided with welding grooves (602), and the input core rod (203) and the output core rod (303) are welded and connected in the welding grooves (602) at the two ends of the copper sheet (6).

8. The wide-range coupling adjustable structure of a band reject filter according to claim 1, characterized in that, The vertical plate (102) is provided with a groove (103), the groove (103) is fixedly connected with a support (104), the copper sheet (6) is installed on the support (104), the copper sheet (6) is connected with a mounting screw (601), and the bottom of the mounting screw (601) is connected on the vertical plate (102).

9. The wide-range coupling adjustable structure of a band-stop filter according to claim 8, wherein, The support (104) and the mounting screw (601) are both non-metal parts, the copper sheet (6) is provided with a circular arc groove (603), and the circular arc groove (603) is concentrically arranged with the auxiliary tuning screw (501).

10. The wide-range coupling adjustable structure of a band reject filter according to claim 1, characterized in that, The cavity (1) and the vertical plate (102) are integrally formed, the top outer wall of the cavity (1) and the top outer wall of the vertical plate (102) are both provided with a threaded hole (101), the cover plate (4) is connected with a locking screw (401), the locking screw (401) penetrates through the cover plate (4) and is connected in the threaded hole (101).

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