Filter antenna end lightning protection structure

Abstract

A lightning protection structure at an antenna end of a filter comprises an antenna connector joint, a connector main rod, a cavity filter, a PCB (Printed Circuit Board), an inductance coil and a wave trap. The antenna connector joint is located outside the cavity filter, and the connector main rod, the PCB and the wave trap are all located in the cavity filter. The connector main rod penetrates through the wall surface of the cavity filter and is connected with the antenna connector joint, and the PCB and the wave trap are respectively located at two opposite sides of the connector main rod. The wave trap is internally provided with an inductance coil, and the inductance coil comprises a spiral body part, a first end part and a second end part, wherein the first end part and the second end part are formed by extending from the spiral body part in opposite directions. The first end part penetrates out of the top cover of the wave trap and is connected with the PCB, and the second end part is connected with the bottom of the wave trap. According to the filter antenna end lightning protection structure, the processing efficiency is improved, and the maintenance difficulty and the replacement cost are reduced.

Description

Technical Field

[0001] The utility model relates to the field of communications, in particular to a lightning protection structure at the antenna end of a filter. Background Art

[0002] The cavity filter is installed on a communication base station and generally requires good lightning protection function. Therefore, a lightning protection structure is generally designed at the antenna end joint of the cavity filter. However, in the prior art, as shown in Figures 1 to 3 the lightning protection structure at the antenna end of the filter includes an inductance coil 1, a PCB board 3, a cavity filter 4, a filter antenna end joint 6, a notch filter 7, and a coupling rod 8 connected to the filter antenna end joint 6. Since the notch filter 7 in the prior art has a central column extending vertically and connected to the PCB board 3, the inductance coil 1 is horizontally connected between the notch filter 7 and the coupling rod 8. Therefore, the prior art uses bar turning processing, and the processing efficiency is low due to the "deep" space and "narrow" cavity. At the same time, the yield of the central column is not high, and it is prone to deformation, bending, diameter defects, etc. It cannot be repaired or replaced separately, and automated batch processing cannot be achieved; and since the central column and the notch filter housing are an integral structure in the prior art, black lines or spots are easily generated at the bottom of the inner cavity during electroplating, which are not easy to clean and repair. At the same time, "hanging plating" treatment is required, and the electroplating cost is 2-3 times that of "barrel plating". Therefore, the processing efficiency of the lightning protection structure at the antenna end of the filter in the prior art is low, the maintenance difficulty is large, and the replacement cost is high. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a lightning protection structure at the antenna end of a filter, which can improve the processing efficiency and reduce the maintenance difficulty and replacement cost.

[0004] To achieve the above purpose, the utility model adopts the following technical scheme: a lightning protection structure at the antenna end of a filter, which includes an antenna connector joint, a connector main rod, a cavity filter, a PCB board, an inductance coil, and a notch filter. The antenna connector joint is located outside the cavity filter, and the connector main rod, the PCB board, and the notch filter are all located inside the cavity filter. The connector main rod passes through the wall surface of the cavity filter and is connected to the antenna connector joint. The PCB board and the notch filter are respectively located on opposite sides of the connector main rod. An inductance coil is arranged inside the notch filter. The inductance coil includes a spiral body part and a first end part and a second end part extending from opposite directions of the spiral body part. The first end part passes through the top cover of the notch filter and is connected to the PCB board, and the second end part is connected to the bottom of the notch filter.

[0005] As a further improved technical scheme of the utility model, a through hole is arranged on the connector main rod, and the first end part of the inductance coil passes through the through hole on the connector main rod and is connected to the PCB board.

[0006] As a further improved technical solution of the present utility model, the inductance coil is soldered to the main rod at the position of the via hole by solder paste.

[0007] As a further improved technical solution of the present utility model, the spiral body part is located inside the notch filter.

[0008] As a further improved technical solution of the present utility model, the spiral body part is arranged at the 1 / 2 position of the overall height of the notch filter.

[0009] As a further improved technical solution of the present utility model, a heat shrinkable sleeve is provided inside the notch filter and the heat shrinkable sleeve wraps around the spiral body part.

[0010] As a further improved technical solution of the present utility model, the material of the notch filter is metal.

[0011] As a further improved technical solution of the present utility model, the inner core material of the antenna connector joint is brass plated with silver, and the material of the connector main rod is copper plated with silver.

[0012] As a further improved technical solution of the present utility model, the material of the cavity filter is aluminum alloy.

[0013] As a further improved technical solution of the present utility model, the material of the inductance coil is enameled wire.

[0014] Compared with the prior art, the present utility model improves the forming efficiency and the yield by canceling the central column of the traditional notch filter, enabling the notch filter housing to be formed by die casting. Compared with turning processing of bar stock, the consistency of the notch filter housings formed by the same batch of dies is more stable, improving the processing efficiency and reducing the maintenance difficulty. The notch filter of the present utility model cancels the traditional central column structure and replaces it with a structure design with an internal inductance coil. According to the cavity depth, the number of turns and the diameter of the coil can be changed, improving the inductance value, resonance, and current-carrying capacity, achieving full-band coverage, that is, without separately changing the entire notch filter, with stronger versatility, indirectly reducing the replacement cost and maintenance cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic diagram of the prior art;

[0016] Figure 2 is Figure 1 the side view of

[0017] Figure 3 is Figure 2 the cross-sectional view along the A-A line in

[0018] Figure 4It is a top view schematic diagram of the lightning protection structure at the antenna end of the filter of the present utility model;

[0019] Figure 5 It is Figure 4 an enlarged view of part B in the lower right corner of

[0020] Figure 6 a sectional view taken along line C-C in Figure 5 ;

[0021] Figure 7 It is a partial three-dimensional exploded view of the lightning protection structure at the antenna end of the filter of the present utility model;

[0022] Figure 8 It is Figure 7 an enlarged view of part D in Specific embodiments

[0023] The following will describe in detail the exemplary specific embodiments of the present utility model with reference to the accompanying drawings. If there are several specific embodiments, the features in these embodiments can be combined with each other without conflict. When the description involves the accompanying drawings, unless otherwise specified, the same numbers in different drawings represent the same or similar elements. The content described in the following exemplary specific embodiments does not represent all embodiments consistent with the present utility model; on the contrary, they are only examples of devices, products, and / or methods consistent with some aspects of the present utility model as recorded in the claims of the present utility model.

[0024] The terms used in the present utility model are only for the purpose of describing specific embodiments and are not intended to limit the protection scope of the present utility model. The singular forms of "a", "the", or "said" used in the description and claims of the present utility model are also intended to include the plural forms unless the context clearly indicates otherwise.

[0025] It should be understood that the terms such as "first", "second", and similar terms used in the description and claims of the present utility model do not represent any order, quantity, or importance, but are only used to distinguish the named features. Similarly, terms such as "a" or "one" do not represent a quantity limitation, but indicate the existence of at least one. Unless otherwise indicated, the terms such as "front", "rear", "upper", "lower", etc. used in the present utility model are only for convenience of description and are not limited to a specific position or a spatial orientation. The expression "including" or "comprising" is an open-ended expression, meaning that the elements appearing before "including" or "comprising" cover the elements appearing after "including" or "comprising" and their equivalents, and this does not exclude that the elements appearing before "including" or "comprising" may also include other elements. If "several" appears in the present utility model, it means two or more.

[0026] Please refer to Figures 4 to 8 shown in the figure. The lightning protection structure at the antenna end of the filter of the present utility model includes an antenna connector joint 1, a connector main rod 2, a cavity filter 3, a PCB board 4, an inductance coil 5, and a trap 6. The antenna connector joint 1 is located outside the cavity filter 3, and the connector main rod 2, the PCB board 4, and the trap 6 are all located inside the cavity filter 3. The connector main rod 2 passes through the wall surface of the cavity filter 3 and is connected to the antenna connector joint 1. The PCB board 4 and the trap 6 are respectively located on opposite sides of the connector main rod 2. An inductance coil 5 is arranged inside the trap 6. The inductance coil 5 includes a spiral body portion 50 and a first end portion 51 and a second end portion 52 extending from opposite directions of the spiral body portion 50. The first end portion 51 passes through the top cover 60 of the trap 6 and is connected to the PCB board 4, and the second end portion 52 is connected to the bottom of the trap 6. Compared with the prior art, the present utility model improves the forming efficiency and has a better yield by canceling the central column of the traditional trap, so that the outer shell part of the trap except the top cover 60 is formed by mold. Compared with turning processing of bar stock, the consistency of the outer shell parts of the traps formed by the same batch of molds is more stable, which improves the processing efficiency and reduces the maintenance difficulty; the trap of the present utility model cancels the traditional central column structure and replaces it with a structure design with an internal inductance coil 5. According to the cavity depth, the present utility model can replace the number of turns and the diameter of the coil to improve the inductance value, resonance, and through-flow capacity, and can achieve full-band coverage, that is, the whole set of traps does not need to be changed separately, and the versatility is stronger, indirectly reducing the replacement cost and maintenance cost.

[0027] Please refer to Figures 6 to 8 shown in the figure. A through hole 20 is provided on the connector main rod 2. The first end portion 51 of the inductance coil 5 passes through the through hole 20 on the connector main rod 2 and is connected to the PCB board 4. When the first end portion 51 of the inductance coil 5 passes through the top cover 60 of the trap 6 and is connected to the PCB board 4, the through hole 20 can ensure positioning between the inductance coil 5 and the connector main rod 2, avoiding the shaking of the inductance coil 5.

[0028] Please refer to Figure 6 and Figure 8 shown in the figure. Further, the inductance coil 5 is soldered to the connector main rod 2 by solder paste at the position of the through hole 20, and the solder paste soldering method improves the positioning stability between the inductance coil 5 and the connector main rod 2.

[0029] Please refer to Figure 6 shown in the figure. In order to achieve the effects of resonance and filtering, the spiral body portion 50 is located inside the trap 6.

[0030] Please continue to refer to Figure 6 As shown, the spiral body part 50 is arranged at the 1 / 2 position of the overall height of the notch filter 6, that is, the spiral body part 50 is located in the middle section of the notch filter 6. The utility model can conveniently change the number of turns and the diameter of the coil according to the cavity depth, so as to achieve different resonant current-carrying effects.

[0031] Please refer to Figure 6 and Figure 7 As shown, a heat shrinkable tube 7 is arranged in the notch filter 6 and the heat shrinkable tube 7 wraps around the spiral body part 50. The function of the heat shrinkable tube 7 is to insulate the periphery of the inductance coil 5 to prevent short circuit.

[0032] Please refer to Figure 7 As shown, the material of the notch filter 6 is metal, preferably an alloy made of two or more metals, such as: copper-aluminum alloy, which ensures the conductivity of the notch filter 6.

[0033] Please refer to Figure 6 and Figure 7 As shown, the inner core material of the antenna connector joint 1 is brass plated with silver, and the material of the connector main rod 2 is copper plated with silver. In this way, while ensuring better conductivity of the antenna connector joint 1 and better conductivity of the connector main rod 2, the cost is reduced to a certain extent.

[0034] Please refer to Figures 4 to 8 As shown, the material of the cavity filter 3 is aluminum alloy. On the one hand, it ensures the conductivity of the cavity filter 3. On the other hand, compared with the notch filter 6 using copper-aluminum alloy, using aluminum alloy for the cavity filter 3 reduces the cost.

[0035] Please refer to Figure 6 and Figure 7 As shown, the material of the inductance coil 5 is enameled wire. In this way, it also meets the requirement of conductivity.

[0036] The lightning protection principle of the utility model is as follows: Since the inner core material of the antenna connector joint 1 is brass plated with silver, the material of the connector main rod 2 is copper plated with silver, the material of the cavity filter 4 is aluminum alloy, the material of the inductance coil 1 is enameled wire, and the material of the notch filter 6 is metal, all of the above materials are conductors; after the inductance coil 1 is welded to the PCB board 4, the bottom of the notch filter 6 and the circuit on the PCB board 4 form a grounding loop, which plays a role in lightning protection.

[0037] In summary, by canceling the central column of the notch filter in the background art, the outer shell part (other than the top cover 60) of the notch filter 6 in the present invention is formed in one mold. Compared with turning processing of bar stock, the forming efficiency is improved, the yield is better, the consistency of the notch filters 6 formed by the same batch of molds is more stable, the processing efficiency is improved, and the maintenance difficulty is reduced. By canceling the traditional central column structure of the notch filter and replacing it with a structure design of arranging an inductance coil 5 in the notch filter 6, the present invention can replace the number of turns and diameter of the coil according to the cavity depth, so as to improve the inductance value, resonance, and current-carrying capacity, and can achieve full-band coverage, that is, without separately changing the whole set of notch filters 6, with stronger versatility, indirectly reducing the replacement cost and maintenance cost. The notch filter 6 in the present invention occupies a small cavity space, and at the same time makes the arrangement of electronic devices on the PCB board 4 flexible, reasonably utilizing the limited space above the PCB board 4. In the cases of carrier signal, receiving sensitivity, signal-to-noise ratio, and suppressing unwanted frequency bands, etc., the lightning protection structure at the antenna end of the filter in the present invention is more stable, more consistent, more practical, simpler in structure, easier to batch, better in electroplating yield, and lower in cost.

[0038] The above embodiments are only used to illustrate the present invention and do not limit the technical solutions described in the present invention. The understanding of the present invention should be based on those skilled in the art of the relevant technical field. Although this specification has described the present invention in detail with reference to the above embodiments, those of ordinary skill in the art should understand that those skilled in the relevant technical field can still modify the present invention or make equivalent replacements, and all technical solutions and their improvements that do not depart from the spirit and scope of the present invention shall be covered by the claims of the present invention.

Claims

1. A lightning protection structure for the antenna end of a filter, which comprises an antenna connector joint (1), a connector main rod (2), a cavity filter (3), a PCB board (4), an inductance coil (5) and a trap (6). The antenna connector joint (1) is located outside the cavity filter (3), and the connector main rod (2), the PCB board (4) and the trap (6) are all located inside the cavity filter (3). The connector main rod (2) passes through the wall surface of the cavity filter (3) and is connected to the antenna connector joint (1). The PCB board (4) and the trap (6) are respectively located on opposite sides of the connector main rod (2), and it is characterized in that: An inductor coil (5) is provided inside the notch filter (6). The inductor coil (5) includes a spiral body portion (50) and a first end portion (51) and a second end portion (52) extending from opposite directions of the spiral body portion (50). The first end portion (51) passes through the top cover (60) of the notch filter (6) and is connected to the PCB board (4), and the second end portion (52) is connected to the bottom of the notch filter (6).

2. The lightning protection structure at the filter antenna end according to claim 1, characterized in that: A through hole (20) is provided on the connector main rod (2). The first end portion (51) of the inductor coil (5) passes through the through hole (20) on the connector main rod (2) and is connected to the PCB board (4).

3. The lightning protection structure at the filter antenna end according to claim 2, characterized in that: The inductor coil (5) is soldered to the connector main rod (2) at the position of the through hole (20) by solder paste.

4. The lightning protection structure at the antenna terminal of the filter according to any one of claims 1 to 3, characterized in that: The spiral body portion (50) is located inside the notch filter (6).

5. The lightning protection structure at the filter antenna end according to claim 4, wherein: The spiral body portion (50) is provided at the 1 / 2 position of the overall height of the notch filter (6).

6. The lightning protection structure at the filter antenna end according to claim 4, wherein: A heat shrinkable sleeve (7) is provided inside the notch filter (6) and the heat shrinkable sleeve (7) wraps around the spiral body portion (50).

7. The lightning protection structure at the filter antenna end according to claim 1, characterized in that: The material of the notch filter (6) is metal.

8. The lightning protection structure at the filter antenna end according to claim 1, characterized in that: The inner core material of the antenna connector joint (1) is brass plated with silver, and the material of the connector main rod (2) is copper plated with silver.

9. The lightning protection structure at the filter antenna end according to claim 1, characterized in that: The material of the cavity filter (3) is aluminum alloy.

10. The lightning protection structure at the filter antenna end according to claim 1, characterized in that: The material of the inductor coil (5) is enameled wire.

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