Ultra-low frequency band filter structure

Abstract

The utility model discloses an ultra-low frequency band filter structure, and belongs to the technical field of filters. An ultra-low frequency band filter structure comprises a cavity and further comprises an output connector and an input connector which are connected to the upper end and the lower end of the cavity. The resonance rod is fixedly connected to the inner wall of the cavity, and a resonance block is fixedly connected to the resonance rod; the first frequency tuning screw rod is in threaded connection with the side surface of the cavity, and one end, arranged in the cavity, of the first frequency tuning screw rod is matched with the resonance block; the tuning screw is in threaded connection with one side, far away from the first frequency tuning screw rod, of the cavity; the cover plate is arranged on the cavity, a second frequency tuning screw rod is arranged on the cover plate, and one end, arranged in the cavity, of the second frequency tuning screw rod is matched with the resonance block; the bidirectional tuning structure can be realized on the side surfaces and the top surface, the frequency reduction effect is achieved, and the design is convenient to process, low in cost, relatively simple to realize and easy to control.

Description

TECHNICAL FIELD

[0001] The utility model relates to filter technical field especially relates to a kind of ultra-low frequency band filter structure. BACKGROUND

[0002] Filter is a kind of equipment or system for signal processing;It is composed of capacitance, inductance and resistance, can effectively filter out the frequency point of specific frequency or the frequency outside the frequency point in power line, obtains a specific frequency power signal, or eliminates a specific frequency power signal.

[0003] In the conventional filter, duplexer, multiplexer design, due to customer requirement appearance size is smaller, depth is shallow and so on, cannot reach the frequency range required by customer (the greater the appearance size, the deeper the frequency, and vice versa is relatively higher), leading to design index cannot satisfy customer demand, and in view of this, the utility model is proposed. UTILITY MODEL CONTENT

[0004] The utility model aims at solving the problems in prior art and provides an ultra-low frequency band filter structure.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0006] An ultra-low frequency band filter structure, comprising a cavity, further comprising:

[0007] Output connector and input connector connected to the upper and lower ends of the cavity;

[0008] Resonance rod fixedly connected to the inner wall of the cavity, and a resonance block fixedly connected to the resonance rod;

[0009] First frequency tuning screw rod threadedly connected to the side of the cavity, and the first frequency tuning screw rod is matched with the resonance block at one end in the cavity;

[0010] Tuning screw, threadedly connected to the side of the cavity away from the first frequency tuning screw rod;

[0011] Cover plate, arranged on the cavity, and the cover plate is provided with a second frequency tuning screw rod, and the second frequency tuning screw rod is matched with the resonance block at one end in the cavity.

[0012] Preferably, the input fixed plate is provided on the input connector, the input fixed plate is connected with input fixed screw, and the input fixed screw is threadedly connected to the cavity at one end through the input fixed plate.

[0013] Further, the output fixed plate is provided on the output connector, the output fixed plate is connected with output fixed screw, and the output fixed screw is threadedly connected to the cavity at one end through the output fixed plate.

[0014] Further, the resonant rod and the resonant block are provided with multiple, and multiple stop blocks are arranged in the cavity, and the multiple resonant blocks are separated by the stop blocks.

[0015] Further, the input joint is provided with an input core rod, the output joint is provided with an output core rod, the input core rod is welded with the lowest resonant rod, and the output core rod is welded with the uppermost resonant rod.

[0016] Preferably, the resonant block is provided with a first transverse groove and a second transverse groove in communication, the first frequency tuning screw is inserted into the second transverse groove, and the second frequency tuning screw is inserted into the first transverse groove.

[0017] Further, the first frequency tuning screw is threadedly connected with a first tuning nut, the second frequency tuning screw is threadedly connected with a second tuning nut, 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.

[0018] Further, the resonant rod is provided with a connecting hole at the end away from the resonant block, the outer wall of the cavity is provided with a counterbore, the tuning screw is connected in the counterbore, and the tuning screw is threadedly connected in the connecting hole at one end of the cavity.

[0019] Further, the cover plate is provided with a coupling tuning screw, the coupling tuning screw is threadedly connected with a coupling tuning nut, the coupling tuning nut abuts against the top outer wall of the cover plate, the coupling tuning screw is inserted into the cavity, the coupling tuning screw and the coupling tuning nut are provided with multiple, and the multiple coupling tuning screws arranged at one end in the cavity are arranged between two adjacent resonant rods.

[0020] Further, the cavity is provided with a mounting hole, and the cover plate is provided with a locking screw, the locking screw passes through the cover plate and is threadedly connected in the mounting hole.

[0021] Compared with the prior art, the ultra-low frequency filter structure has the following beneficial effects:

[0022] 1. The ultra-low frequency band filter structure, the input joint at the bottom of the cavity can input signals, the first frequency tuning screw on the side of the cavity is adjusted, frequency coupling adjustment can be carried out, the effect of reducing frequency is achieved, the number of the first frequency tuning screw and the second frequency tuning screw is increased, a wider window coupling tuning range is achieved, the second frequency tuning screw is arranged on the cover plate, bidirectional tuning structure on the side and the top surface can be achieved, the frequency can be tuned on both sides, the effect of reducing frequency is achieved, the design is convenient to process, low in cost, simple to realize, easy to control and the like, according to requirements, the dielectric constant of the insulating material can be adjusted at will, so that the customer's requirements are met.

[0023] 2. The ultra-low frequency band filter structure, the depth of the first frequency tuning screw inserted into the second transverse groove and the depth of the second frequency tuning screw located in the first transverse groove are adjusted, and then the first tuning nut and the second tuning nut are fixed, so that the performance of the filter can be adjusted to adapt to different application requirements, different coupling value effects are achieved, and bidirectional coupling structure is adopted on the side and the top surface, so that the effect of reducing frequency is achieved.

[0024] 3. The ultra-low frequency band filter structure solves the problem that the frequency reaches the frequency range required by the customer in the design of the filter, the duplexer and the combiner under the condition that the size and the height are small, avoids the problem that the insertion loss index does not meet the requirements of the customer caused by the use of the mushroom head flange type resonant column, and the problem that the cost of the flange resonant column is high. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 A structure diagram of the ultra-low frequency band filter structure is provided for the utility model Figure 1 ;

[0026] Figure 2 A structure diagram of the ultra-low frequency band filter structure is provided for the utility model Figure 2 ;

[0027] Figure 3 A front view of the ultra-low frequency band filter structure without a cover plate is provided for the utility model Figure 1 ;

[0028] Figure 4 An enlarged view of part A of the ultra-low frequency band filter structure is provided for the utility model Figure 3 ;

[0029] Figure 5 A front view of the ultra-low frequency band filter structure without a cover plate is provided for the utility model Figure 2 ;

[0030] Figure 6A kind of super low frequency band filter structure in the utility model discloses a three-dimensional structure schematic diagram without cover plate;

[0031] Figure 7 A kind of super low frequency band filter structure in the utility model discloses a sectional view schematic diagram;

[0032] Figure 8 A kind of super low frequency band filter structure in the utility model discloses a structure schematic diagram of resonant rod and resonant block Figure 1 ;

[0033] Figure 9 A kind of super low frequency band filter structure in the utility model discloses a structure schematic diagram of resonant rod and resonant block Figure 2 .

[0034] In the drawing: 1, cavity;101, cover plate;102, locking screw;103, mounting hole;104, counterbore;105, tuning screw;2, input connector;201, input fixed plate;202, input fixed screw;203, input core rod;3, output connector;301, output fixed plate;302, output fixed 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 DESCRIPTION

[0035] The technical scheme in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments.

[0036] 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, therefore it cannot be understood as a limitation on the present application. EMBODIMENT

[0037] REFERENCE Figures 1-9The application relates to an ultra-low frequency filter structure, which comprises a cavity 1, characterized in that the structure further comprises output connectors 3 and input connectors 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, 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 being matched with the resonant block 401 in the cavity 1, a tuning screw 105 threadedly connected to the side of the cavity 1 away from the first frequency tuning screw 5, and a cover plate 101 arranged on the cavity 1, wherein the cover plate 101 is provided with a second frequency tuning screw 502, and one end of the second frequency tuning screw 502 is matched with the resonant block 401 in the cavity 1.

[0038] In use, the signal can be input through the input connectors 2 at the bottom of the cavity 1, and the signal is transmitted through the resonant rod 4. In the application, the resonant rod 4 is square. In the filter, the square resonant block 401 mainly improves the circuit NVH performance and circuit parameters, and can improve the quality factor of the circuit, that is, reduce the loss of the circuit and improve the operation efficiency of the circuit. In specific use, the frequency coupling adjustment can be realized by adjusting the first frequency tuning screw 5 at the side of the cavity 1, so that the frequency is reduced, the number of the first frequency tuning screw 5 and the second frequency tuning screw 502 is increased, and a wider window coupling tuning range is achieved. The second frequency tuning screw 502 is arranged on the cover plate 101, so that the bidirectional tuning structure is realized on the side and the top, the frequency can be tuned on both sides, the frequency is reduced, and the design is convenient, low in cost, simple to realize, easy to control and the like. According to requirements, the insulating material with different dielectric constants can be used for arbitrary adjustment, so that the requirements of customers are met. The output connectors 3 arranged at the top can output the filtered signal for use, and the cover plate 101 can guarantee the sealing performance of the cavity 1. Embodiment

[0039] Reference Figures 1-9 The application relates to an ultra-low frequency filter structure, which comprises a cavity 1, characterized in that the structure further comprises output connectors 3 and input connectors 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, 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 being matched with the resonant block 401 in the cavity 1, a tuning screw 105 threadedly connected to the side of the cavity 1 away from the first frequency tuning screw 5, and a cover plate 101 arranged on the cavity 1, wherein the cover plate 101 is provided with a second frequency tuning screw 502, and one end of the second frequency tuning screw 502 is matched with the resonant block 401 in the cavity 1.

[0040] Reference Figures 1-3 ,Figure 5 And Figure 6 The input joint 2 is provided with an input fixing plate 201, and the input fixing plate 201 is connected with an input fixing screw 202, and the input fixing screw 202 is threadedly connected to the cavity 1 through one end of the input fixing plate 201.

[0041] Referring to Figures 1-3 , Figure 5 And Figure 6 The output joint 3 is provided with an output fixing plate 301, and the output fixing plate 301 is connected with an output fixing screw 302, and the output fixing screw 302 is threadedly connected to the cavity 1 through one end of the output fixing plate 301.

[0042] In this embodiment, when installing the input joint 2 and the output joint 3, first, the input fixing plate 201 is attached to the outer wall of the cavity 1, and then the input fixing plate 201 is fixedly connected to the cavity 1 through the input fixing screw 202, completing the installation of the input joint 2. Similarly, the output fixing plate 301 can be installed on the top outer wall of the cavity 1 through the output fixing screw 302, thereby facilitating the input and output operations of signals.

[0043] Referring to Figures 1-9 The resonant rod 4 and the resonant block 401 are both provided with multiple, and multiple stoppers 404 are arranged in the cavity 1, and the multiple resonant blocks 401 are separated by the stoppers 404. The multiple resonant blocks 401 are separated by the stoppers 404, so that they work independently, thereby facilitating the use of the multiple first frequency tuning screws 5 and the second frequency tuning screws 502, and achieving a bidirectional tuning structure on the side surface and the top surface. The frequency can be tuned on both sides to achieve the function of frequency reduction, and the depth of insertion of the first frequency tuning screw 5 and the second frequency tuning screw 502 into the resonant block 401 is adjustable, which can adjust different coupling values to affect the performance of the filter to adapt to different application requirements.

[0044] Referring to Figure 5 The input joint 2 is provided with an input core rod 203, and the output joint 3 is provided with an output core rod 303, and the input core rod 203 is welded with the lowest resonant rod 4, and the output core rod 303 is welded with the uppermost resonant rod 4.

[0045] By welding the input joint 2 and the output joint 3 with the resonant rod 4, the stability and reliability of the filter can be improved, and the loss in the signal transmission process can be reduced. By welding, the connection between the input core rod 203 and the output core rod 303 and the resonant rod 4 is more firm, which helps to reduce signal reflection and loss caused by poor connection, thereby improving the overall performance of the filter. Embodiment

[0046] Referring to Figures 1-9The utility model provides an ultra-low frequency band filter structure, including cavity 1, it is characterized in passing through the output joint 3 and input joint 2 connected in the upper and lower ends of cavity 1, and the resonant rod 4 fixedly connected in the inner wall of cavity 1, and the resonant block 401 fixedly connected on the resonant rod 4, the first frequency tuning screw rod 5 is screw connected on the side of cavity 1, and one end of first frequency tuning screw rod 5 is placed in cavity 1 and is matched with resonant block 401, and the tuning screw 105 is screw connected on the side of cavity 1 away from first frequency tuning screw rod 5, and the cover plate 101 is also arranged on cavity 1, and the second frequency tuning screw rod 502 is equipped on the cover plate 101, and one end of second frequency tuning screw rod 502 is placed in cavity 1 and is matched with resonant block 401.

[0047] Refer to Figure 3 And Figure 4 Resonant block 401 is equipped with the first horizontal groove 402 and the second horizontal groove 403 that are connected, and the first frequency tuning screw rod 5 is inserted in the second horizontal groove 403, and the second frequency tuning screw rod 502 is inserted in the first horizontal groove 402.

[0048] Refer to Figures 1-9 First tuning nut 501 is screw connected on the first frequency tuning screw rod 5, and second tuning nut 503 is screw connected on the second frequency tuning screw rod 502, and first tuning nut 501 is matched with the side wall of cavity 1, and second tuning nut 503 is matched with the outer wall of cover plate 101.

[0049] In the embodiment, in use, the depth of the first frequency tuning screw rod 5 inserted in the second horizontal groove 403 can be adjusted, and then fixed by the first tuning nut 501, and the depth of the second frequency tuning screw rod 502 in the first horizontal groove 402 can be adjusted, and then fixed by the second tuning nut 503, so that the performance of the filter can be adjusted to adapt to different application requirements, so as to achieve different coupling value effects, and the bidirectional coupling structure is used on the side and the top surface, so as to reduce the frequency, and the number of the first frequency tuning screw rod 5 and the second frequency tuning screw rod 502 is increased, so as to achieve a wider window coupling tuning range.

[0050] Refer to Figures 6-9 The end of resonant rod 4 away from resonant block 401 is equipped with connecting hole 405, and the outer wall of cavity 1 is equipped with counterbore 104, and tuning screw 105 is connected in counterbore 104, and tuning screw 105 is screw connected in connecting hole 405 through one end of cavity 1.

[0051] Connecting hole 405 and counterbore 104 are arranged, and resonant rod 4 can be fixed by tuning screw 105, so that the connection is more stable, and the use and operation are facilitated.

[0052] Refer to Figures 6-9The cover plate 101 is provided with coupling tuning screws 504, the coupling tuning screws 504 are threadedly connected with coupling tuning nuts 505, the coupling tuning nuts 505 abut against the top outer wall of the cover plate 101, the coupling tuning screws 504 are inserted into the cavity 1, and the coupling tuning screws 504 and the coupling tuning nuts 505 are provided in plurality, and the plurality of coupling tuning screws 504 are arranged between two adjacent resonance rods 4 at one end in the cavity 1.

[0053] In the embodiment, the cover plate 101 is further provided with the coupling tuning screws 504, the coupling value of the cavity 1 can be adjusted, the coupling tuning screws 504 can be inserted into the cavity 1 to different depths, in operation, the position of the coupling tuning screws 504 on the cover plate 101 is directly adjusted, the depth of the coupling tuning screws 504 inserted into the cavity 1 is adjusted, then the coupling tuning nuts 505 are used for fixing, so that different coupling effects can be conveniently adjusted, and the antenna is convenient to use in different occasions or requirements.

[0054] Referring to 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 threadedly connected in the mounting hole 103.

[0055] In the embodiment, when the cover plate 101 is installed, the cover plate 101 is first connected to the cavity 1, and then the locking screw 102 is connected to pass through the cover plate 101 and be connected in the mounting hole 103, so that the cover plate 101 is fixed, the fixing effect is enhanced, the sealing effect of the cavity 1 is ensured, and the antenna is more convenient to use.

[0056] The above describes only a preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this, any skilled person in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, and all of them should be covered in the protection scope of the present application.

Claims

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

2. The ultra-low band filter structure of claim 1, wherein, The input fixed plate (201) is arranged on the input connector (2), the input fixed screw (202) is connected to the input fixed plate (201), and one end of the input fixed screw (202) is threadedly connected to the cavity (1).

3. The ultra-low band filter structure of claim 2, wherein, The output fixed plate (301) is arranged on the output connector (3), the output fixed screw (302) is connected to the output fixed plate (301), and one end of the output fixed screw (302) is threadedly connected to the cavity (1).

4. The ultra-low band filter structure of claim 3, wherein, The resonant rod (4) and the resonant block (401) are provided with a plurality of resonant rods (4) and resonant blocks (401), and a plurality of stop blocks (404) are arranged in the cavity (1), and the plurality of resonant blocks (401) are separated by the stop blocks (404).

5. The ultra-low band filter structure of claim 4, wherein, The input core rod (203) is arranged on the input connector (2), the output core rod (303) is arranged on the output connector (3), 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 band filter structure of claim 1, wherein, The first transverse groove (402) and the second transverse groove (403) are arranged on the resonant block (401) and 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).

7. The ultra-low band filter structure of claim 6, wherein, The first tuning nut (501) is threadedly connected to the first frequency tuning screw (5), the second tuning nut (503) is threadedly connected to 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).

8. The ultra-low band filter structure of claim 7, wherein, The connecting hole (405) is arranged at one end of the resonant rod (4) away from the resonant block (401), the counterbore (104) is arranged on the outer wall of the cavity (1), the tuning screw (105) is connected in the counterbore (104), and one end of the tuning screw (105) is threadedly connected in the connecting hole (405).

9. The ultra-low band filter structure of claim 8, wherein, The cover plate (101) is provided with a coupling tuning screw (504), the coupling tuning screw (504) is threadedly connected with a coupling tuning nut (505), the coupling tuning nut (505) is in abutment with the top outer wall of the cover plate (101), the coupling tuning screw (504) is inserted into the cavity (1), and the coupling tuning screw (504) and the coupling tuning nut (505) are both provided with a plurality of ones, and the plurality of coupling tuning screws (504) are arranged between two adjacent resonance rods (4) at one end in the cavity (1).

10. The ultra-low band filter structure of claim 9, wherein, 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) penetrates through the cover plate (101) and is threadedly connected in the mounting hole (103).

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