Filter

Abstract

The utility model provides a filter, which comprises a cavity with an opening at the upper part, a cover plate arranged at the opening end of the cavity, a resonator arranged in the cavity, and a tuning rod which passes through the cover plate, extends into the cavity and is used for tuning, the cover plate is provided with a through hole, the filter is further provided with a shielding structure, the shielding structure comprises a connecting piece and a shielding piece, the tuning rod penetrates through the through hole to be in threaded connection with the connecting piece, the shielding piece covers the periphery of the connecting piece, and the shielding structure is used for wrapping the plastic tuning rod to form a closed interval. And signals in the closed interval cannot be leaked out. The utility model has the advantages of simple structure, convenient production and low cost, and improves the signal propagation efficiency.

Description

Technical Field

[0001] The utility model relates to the field of communication technologies, and particularly relates to a filter with a shielding structure.

Background Art

[0002] Filters play a crucial role in modern communication systems. Traditional dielectric filters use plastic screws, and the signal shielding effect is relatively poor. As a signal filtering device, a filter itself should not interfere with the outside world, that is, it should not generate electromagnetic interference to the environment. Plastic is a non-conductive material, which causes signals to penetrate through the plastic screws and spread to the outside world, resulting in signal leakage and causing interference to external signals.

[0003] Therefore, it is urgent to design a filter that can prevent signal leakage.

Summary of the Utility Model

[0004] The main purpose of the utility model is to provide a filter with a shielding structure.

[0005] To achieve the above object, the technical solution provided by the utility model is to provide a filter, which includes a cavity with an open upper end, a cover plate installed at the opening end of the cavity, resonators installed in the cavity, and a tuning rod passing through the cover plate and extending into the cavity for tuning; the cover plate is provided with a through hole, and the filter is further provided with a shielding structure. [6] The shielding structure includes a connecting piece and [7] a shielding member. The tuning rod passes through the through hole and is threadedly connected to the connecting piece. The connecting piece is located outside the cover plate and forms an electrically conductive connection with the cover plate; the shielding member is sleeved on the outer end of the tuning rod and connected to the connecting piece. [8]

[0006] As a preferred technical solution, the inner wall of the shielding member is provided with a threaded portion that cooperates with the outer wall of the connecting piece, and the shielding member covers the outer circumference of the connecting piece.

[0007] As a preferred technical solution, the connecting piece is a nut, and the shielding member is a nut.

[0008] As a preferred technical solution, the nut is [9] a conductive metal nut, and its inner hole is threadedly connected to the tuning rod.

[0009] As a preferred technical solution, the nut is a conductive metal nut, and its open end surrounds the outer wall of the nut and forms an electrically conductive connection.

[0010] As a preferred technical solution, a ceramic tuning disc is provided at the lower end of the tuning rod. ​

[0011] As a preferred technical solution, one or two flat positions are provided on the outer side of the nut.

[0012] As a preferred technical solution, fixing holes are provided at the bottom of the cavity, and the filter further includes screws for installing the resonator into the fixing holes.

[0013] As a preferred technical solution, a boss is formed by upward protrusion at the central position of the bottom of the cavity, and the lower end of the resonator is inserted into the fixing hole of the boss.

[0014] As a preferred technical solution, the tuning rod is a plastic rod, and the connection between the plastic rod and the through hole is a threaded connection or a non-threaded connection.

[0015] For the filter provided by the present utility model, a shielding structure is provided on the outer side of the cover of the filter. The shielding structure includes a connecting member and a shielding member, and the shielding member covers the outer periphery of the connecting member. By utilizing the property that metal can conduct electricity of the shielding structure, the plastic screw is wrapped into a closed area, so that the internal electromagnetic wave signals are shielded within this space, and thus the signals cannot leak to the outside and cause signal interference to the outside. The structure of the present utility model is simple, convenient for production, low in cost, and improves the signal propagation efficiency.

BRIEF DESCRIPTION OF THE DRAWINGS

[0016] To further disclose the specific technical content of this case, please first refer to the attached drawings, where:

[0017] Figure 1 is an exploded view of the filter provided by the embodiment of the present utility model

[0018] Figure 2 is a schematic cross-sectional view of the filter provided by the embodiment of the present utility model;

[0019] Figure 3 is a perspective view of the shielding member of the filter provided by the embodiment of the present utility model;

[0020] Figure 4 is a perspective view of the connecting member of the filter provided by the embodiment of the present utility model;

[0021] Figure 5 is a perspective view of the tuning rod of the filter provided by the embodiment of the present utility model.

[0022] Symbol description:

[0023] Cavity 1, Shielding structure 2

[0024] Connecting member 21, Shielding member 22

[0025] Cover plate 3, Through hole 31

[0026] Tuning rod 4, flange 41

[0027] Tuning disk 5, screw 6

[0028] Resonator 8, mounting hole 81

Detailed implementation manners

[0029] The present utility model will be further described below in conjunction with the accompanying drawings and embodiments.

[0030] Please refer to Figures 1 to 5 , the present utility model provides a cavity 1 with an upper opening, a cover plate 3 installed at the opening end of the cavity, a

[10] resonator 8 installed in the cavity, and a tuning rod 4 passing through the cover plate 3 and extending into the cavity 1 for tuning; the cover plate 3 is provided with a through hole 31.

[0031] In this embodiment, the tuning rod 4 is a plastic rod.

[0032] The plastic tuning rod 4 passes through the through hole 31 and is threadedly connected to the connecting member 21.

[0033] The filter is further provided with a shielding structure 2, and the shielding structure 2 includes a connecting member 21 and a shielding member 22. The connecting member 21 is located outside the cover plate 3 and forms an electrical connection with the cover plate 3; the shielding member 22 is sleeved on the outer end of the tuning rod 4 and is connected to the connecting member 21.

[0034] The inner wall of the shielding member 22 is provided with a threaded portion that cooperates with the outer wall of the connecting member 21, and the shielding member 22 covers the outer circumference of the connecting member 21.

[0035] The open end of the shielding member 22 surrounds the outer wall of the connecting member 21 and forms an electrically conductive connection.

[0036] In this embodiment, the connecting member 21 is a metal nut, and correspondingly, the shielding member 22 is a metal nut. For better electrical conductivity, the nut and the nut can be made of iron or stainless steel materials with better electrical conductivity.

[0037] One or two flat positions are further provided on the outer side of the nut, and concave portions corresponding to the flat positions are provided on the nut, and the combination of the flat positions, the concave portions and the threads can be used to better adjust the tuning rod 4 to a suitable position.

[0038] The inner hole of the metal nut is threadedly connected to the tuning rod 4, or can also be non-threadedly connected.

[0039] The lower end of the tuning rod 4 is provided with a ceramic tuning disk 5.

[0040] The bottom of the tuning rod 4 extends horizontally to form a flange 41, and the flange 41 is used for bonding and positioning the tuning disk.

[0041] The bottom of the cavity 1 is provided with a fixing hole.

[0042] A boss protrudes upward from the central position at the bottom of the cavity 1, and the fixing hole is provided at the central position of the boss.

[0043] An installation hole 81 is provided at the center of the resonator 8.

[0044] The filter further includes a screw 6. The screw 6 fixes and installs the resonator 8 into the cavity 1 through the installation hole 81, and the lower end of the resonator 8 is inserted into the fixing hole of the boss.

[0045] The installation steps of the embodiment of the present utility model are elaborated in detail:

[0046] Place the resonator 8 into the cavity 1, and fix the resonator 8 with the screw 6 through the installation hole 81. The lower part of the resonator 8 is inserted into the fixing hole at the bottom of the cavity 1;

[0047] Install the tuning rod 4 on the ceramic tuning disk 5. The tuning rod 4 passes through the through hole 31 of the cover plate 3 and is threadedly connected with the nut, and the nut cap is arranged on the outer periphery of the nut. Install the installed cover body 3 at the opening end of the cavity 1.

[0048] In this embodiment, by utilizing the conductive characteristics of the metal material of the connecting member 21 and the shielding member 22, the plastic screw rod 4 is wrapped into a closed area, so that the internal signal is shielded within this space, and thus the signal cannot leak to the outside and cannot cause signal interference to the outside.

[0049] The shielding structure 2 of the present utility model solves the problem of signal leakage of the filter. The connecting member and the shielding member have a simple structure, are convenient for production, have a low cost, and improve the signal propagation efficiency.

[0050] The above embodiments only represent several implementation manners of the present utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the patent of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several deformations and improvements can still be made, and these all belong to the protection scope of the present utility model. Therefore, the protection scope of the patent of the present utility model shall be subject to the appended claims.

Claims

1. A filter, comprising a cavity (1) with an upper opening, a cover plate (3) installed at the opening end of the cavity, a resonator (8) installed in the cavity, and a tuning rod (4) passing through the cover plate (3) and extending into the cavity (1) for tuning; the cover plate (3) is provided with a through hole (31), characterized in that: The filter is further provided with a shielding structure (2), the shielding structure (2) includes a connecting member (21) and a shielding member (22), the tuning rod (4) passes through the through hole (31) and is threadedly connected to the connecting member (21), the connecting member (21) is located outside the cover plate (3) and forms an electrically conductive connection with the cover plate (3); the shielding member (22) is sleeved on the outer end of the tuning rod (4) and connected to the connecting member (21).

2. The filter according to claim 1, wherein The inner wall of the shielding member (22) is provided with a threaded portion that cooperates with the outer wall of the connecting member (21), and the shielding member (22) covers the outer circumference of the connecting member (21).

3. The filter according to claim 2, wherein, The connecting member (21) is a nut, and the shielding member (22) is a screw cap.

4. The filter according to claim 3, wherein The nut is a conductive metal nut, and its inner hole is threadedly connected to the tuning rod (4).

5. The filter according to claim 3, characterized in that, The screw cap is a conductive metal screw cap, and its open end surrounds the outer wall of the nut and forms an electrically conductive connection.

6. The filter according to claim 1, characterized in that, A ceramic tuning disc (5) is provided at the lower end of the tuning rod (4).

7. The filter according to claim 3, characterized in that One or two flat positions are provided on the outer side of the nut.

8. The filter according to claim 1, wherein A fixing hole is provided at the bottom of the cavity (1), and the filter is further provided with a screw (6), and the screw (6) is used to install the resonator (8) into the fixing hole.

9. The filter according to claim 1, wherein A boss is formed by upward protrusion at the central position of the bottom of the cavity (1), and the lower end of the resonator (8) is inserted into the fixing hole of the boss.

10. The filter according to claim 1, characterized in that, The tuning rod (4) is a plastic rod, and the connection between the plastic rod and the through hole (31) is a threaded connection or a non-threaded connection.

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