Cavity filter

Abstract

The utility model relates to the technical field of filters, in particular to a cavity filter, which comprises a filter shell, an input end is arranged on one side of the filter shell, and an output end is arranged on the other side of the filter shell. A tuning component and a resonant cavity capable of being disassembled quickly are arranged in the filter shell. The resonant cavity is fixedly installed on a drawing plate, a clamping groove is formed in the inner wall of the filter shell, and the drawing plate is connected with the clamping groove of the filter shell in a sliding and clamping mode. The filter shell is internally provided with at least two resonant cavities, the at least two resonant cavities are in the same cavity shape or different cavity shapes, and the at least two resonant cavities are arranged in the filter shell to form a filtering channel. According to the utility model, the modular design is adopted, the structure of the filtering channel can be changed through the form of quickly replacing components, and the problems in the prior art are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of filters, and in particular to a cavity filter. Background Art

[0002] The working principle of the cavity filter is based on the resonance phenomenon of electromagnetic waves in a closed metal cavity. When the electromagnetic wave enters the cavity, it is reflected in the cavity and forms a standing wave. At a specific frequency, these standing waves will match the geometric dimensions and dielectric properties of the cavity, thereby generating resonance. By designing the size and shape of the cavity, the cavity can be made to resonate at the required operating frequency, thereby allowing the signal of that frequency to pass through, while suppressing signals of other frequencies to achieve the filtering function. The cavity filter mainly relies on the shape design of the internal filter channel to achieve filtering. However, the structural design of the filter channel in the prior art is various, and different filter channel structures can be used to filter signals of different frequencies. In existing cavity filters, the resonant cavity is generally an integrated structure with the filter. When the resonant cavity is damaged or when different signals need to be filtered, a new filter needs to be replaced, which affects work efficiency and increases production costs.

[0003] The Chinese utility model patent with the name of "Cavity Filter" and the publication number CN203180030U has been made public. The patent includes a filter cavity, a first cover plate and a second cover plate. The first cover plate and the second cover plate are used to cover the filter cavity to form a resonant cavity. An isolation portion is provided in the filter cavity for dividing the resonant cavity in the filter cavity into at least two sub-resonant cavities. A tuning screw is provided on the first cover plate, and a resonator is provided on the second cover plate. The resonator includes a conductive body and a dielectric body, wherein the conductive body is sleeved inside or outside the dielectric body. The cavity filter of this utility model can effectively reduce the resonant frequency and increase the power capacity, reduce the cavity volume, and increase the system volume ratio, so that the system can add more usage functions under the volume.

[0004] However, the cavity inside the filter is an integrated structure. When it is damaged, the entire filter needs to be replaced, and the frequency signals that can be filtered are limited. Utility Model Content

[0005] The purpose of the present application is to provide a cavity filter with a modular design, which can change the structure of the filter channel by quickly replacing components, thereby solving the problems in the prior art.

[0006] In order to solve the above technical problems, the solution adopted by this application is as follows:

[0007] A cavity filter comprises a filter housing, wherein an input end is provided on one side of the filter housing, and an output end is provided on the other side of the filter housing.

[0008] Preferably, a tuning component and a quickly detachable resonant cavity are provided inside the filter housing.

[0009] Preferably, the resonant cavity is fixedly mounted on a draw plate, a slot is provided on the inner wall of the filter housing, and the draw plate is slidably engaged with the slot of the filter housing.

[0010] Preferably, at least two resonant cavities are provided in the filter housing, and the at least two resonant cavities have the same cavity shape or different cavity shapes. The at least two resonant cavities are provided in the filter housing to form a filtering channel.

[0011] Preferably, a temperature-insulating cavity is provided on the outside of the filter housing, and heat dissipation holes are provided on the wall of the temperature-insulating cavity located on the top of the filter housing.

[0012] Preferably, the resonant cavity includes a bottom plate and a vertical plate arranged on the bottom plate, the vertical plate is the cavity wall of the resonant cavity; the above-mentioned drawer plate is also provided on the bottom plate.

[0013] Preferably, the tuning component includes a coupling column, which passes through the filter housing. A stepped coupling head is provided at the bottom of the coupling column, and the coupling head of the coupling column extends into the filter housing. A coupling chamber is fixedly installed at the bottom of the filter housing, and the coupling column moves linearly along the axial direction of the coupling chamber in the inner cavity of the coupling chamber.

[0014] Preferably, the thermal insulation cavity includes a heat sink and a mounting plate, the heat sink is located on the top of the filter housing, the heat dissipation holes are provided on the heat sink, the plate surface of the thermal insulation cavity without heat dissipation holes is provided as a mounting plate, the heat sink and the mounting plate are fixedly mounted on the outside of the filter housing through a support, and the heat sink and the mounting plate are interconnected and combined into a thermal insulation cavity as a whole.

[0015] Preferably, the coupling chamber is arranged in the filter housing, a frustum is provided on the top of the coupling chamber, the outer diameter of the frustum is larger than the diameter of the bottom tube wall of the coupling chamber, a conductive film is fixedly provided on the inner cavity wall of the coupling chamber, and an avoidance hole for avoiding the coupling chamber is provided on the bottom plate.

[0016] Preferably, a detachable end cover is provided on the top of the filter housing, a coupling column is threadedly mounted on the end cover, and a coupling head at the bottom of the coupling column is coupled to the inner cavity of the coupling chamber.

[0017] The technical solution of this application has at least the following advantages and beneficial effects:

[0018] The device can quickly replace the internal resonant cavity, avoiding the scrapping of the entire filter and saving production costs. In addition, the resonant cavity inside the filter is set as multiple modules, which can be combined to form different resonant cavity shapes, thereby improving the filtering range of the filter.

[0019] The tuning components inside the filter can be tuned by adjusting the distance between the coupling column and the coupling chamber. In addition, the coupling column is provided with a stepped coupling head to achieve tuning of different signals through different coupling strengths.

[0020] A thermal insulation cavity is provided outside the filter, which can isolate the heat emitted from the outside from being conducted to the filter, and can also dissipate the heat generated inside the filter. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural diagram of the utility model;

[0022] Figure 2 Schematic diagram of the structure of the resonant cavity of the device.

[0023] Figure 3 It is a schematic cross-sectional structural diagram of the present utility model.

[0024] Figure 4 This is a structural diagram of the utility model from another angle.

[0025] Figure 5 Schematic diagram of the cross-sectional structure of the tuning component.

[0026] Figure 6 This is a schematic diagram of the cross-sectional structure of the tuning component from another angle.

[0027] In the figure: 1-filter housing; 3-drawer plate; 11-end cover; 21-heat sink; 22-support member; 23-mounting plate; 31-first cavity; 32-second cavity; 41-coupling chamber; 42-conductive film; 43-coupling column; 44-gasket; 45-bolt. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0029] It should be noted that similar reference numerals and letters denote similar items in the following figures. Therefore, once an item is defined in one figure, it does not require further definition or explanation in subsequent figures. Terms such as "center," "upper," "lower," "inner," and "outer" indicate positions or locations based on the positions or locations shown in the figures, or the positions or locations in which the product is typically placed when in use. These terms are used solely for ease of description and simplification of the present application. They do not indicate or imply that the device or component referred to must have a specific position, be constructed, or operate in a specific orientation, and are not to be construed as limiting the present application. It should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "mounted," and "connected" should be interpreted broadly. For example, they can refer to fixed, removable, or integral connections; mechanical or electrical connections; direct connections or indirect connections through an intermediary; or internal connections between two components. Those skilled in the art will understand the specific meanings of these terms in this application in specific contexts.

[0030] Example

[0031] Please refer to Figures 1-6 The utility model provides a cavity filter, including a filter housing 1, a temperature-isolating cavity, a resonant cavity, and a tuning component.

[0032] Furthermore, the filter housing 1 is provided with a temperature-insulating cavity on its exterior, with heat dissipation holes provided on the cavity wall at the top of the filter housing 1. A tuning component is fixedly mounted inside the filter housing 1, and a resonant cavity can be quickly and detachably connected to the interior of the filter housing 1. When different types of resonant cavities are installed in the filter housing, different filter channels are formed, thereby filtering signals of different frequencies.

[0033] When the filter is installed, the surface of the insulation cavity without heat dissipation holes is used as the installation surface; a mounting plate 23 is provided on the installation surface, and a heat dissipation plate 21 is provided on the surface with heat dissipation holes. The heat dissipation plate 21 and the installation plate 23 form an insulation cavity that covers the entire filter housing 1. The heat dissipation plate 21 and the installation plate 23 are connected by screws and can be quickly disassembled and assembled.

[0034] The heat dissipation holes are located on the side away from the external environment working components, and the mounting surface is located on the side close to the external environment working components, so as to prevent the heat emitted by other working components in the external environment from affecting the heat dissipation of the filter.

[0035] In this embodiment, the cavity wall of the filter housing 1 is relatively thin, and the tuning component inside the filter housing 1 is also close to the cavity wall of the filter housing 1. When the tuning component is tuned, it will generate heat, and the heat will be introduced into the outside of the filter housing 1 through the thinner cavity wall of the filter housing 1, and dissipated through the heat dissipation holes on the top of the thermal insulation cavity; the thermal insulation cavity wraps the filter housing 1 to isolate the external heat (conducted from the installation surface), thereby preventing the large amount of heat generated by the external working environment from affecting the operation of the filter.

[0036] Furthermore, the resonant cavity is fixedly installed on the drawer plate 3, and a slot is provided on the inner wall of the filter housing 1. The drawer plate 3 is located inside the filter housing 1, and the drawer plate 3 is slidably engaged with the slot of the filter housing 1 to achieve rapid replacement of the resonant cavity.

[0037] In this embodiment, a resonant cavity that can be quickly detachably connected to the filter housing is provided, so that when the resonant cavity inside the cavity filter is damaged, or when different filtering functions are performed, the filtering function of the cavity filter can be realized by quickly removing the drawer plate 3 and the resonant cavity on the drawer plate 3, and then replacing it with a new one or a resonant cavity with a different shape.

[0038] In some feasible embodiments, at least two resonant cavities are provided inside the filter housing 1. After the at least two resonant cavities are installed in the filter housing, different filter channel structures are formed to enable the cavity filter to filter signals of different frequencies.

[0039] The resonant cavities installed in the filter housing may have the same cavity shape or different cavity shapes.

[0040] The modular design of the resonant cavity and the rapid combination of multiple types can reduce the number of mold processing in the production of filters and improve the production and installation efficiency of filters.

[0041] Furthermore, the tuning component includes a coupling column 43, which passes through the filter housing 1. A stepped coupling head is provided at the bottom of the coupling column 43, and the coupling head of the coupling column 43 extends into the filter housing 1. A coupling chamber 41 is fixedly installed at the bottom of the filter housing 1. The coupling column 43 moves in the inner cavity of the coupling chamber 41 to achieve coupling, thereby adjusting the resonant frequency and filtering characteristics.

[0042] The transmission characteristics of the filter are determined by the strength and mode of coupling between different resonant cavities in the cavity filter.

[0043] Preferably, the stepped coupling head of the coupling column 43 extends into the inner cavity of the coupling column 43. The outer wall surface of the coupling head forms an outer wall surface with different surface areas due to its stepped shape. The coupling heads with different surface areas move in the inner cavity of the coupling chamber 41, which will change the coupling strength and achieve tuning of different frequencies.

[0044] Furthermore, a removable end cover 11 is provided on the top of the filter housing 1, and a coupling column 43 is threadedly installed on the end cover 11. A gasket 44 is provided between the coupling column 43 and the end cover 11. The coupling head at the bottom of the coupling column 43 is coupled to the inner cavity of the coupling chamber 41, and the coupling column 43 is displaced in the length direction of the inner cavity of the coupling chamber 41 through the thread.

[0045] In practical applications of this embodiment, there are two types of resonant cavities, which are defined as a first cavity 31 and a second cavity 32 .

[0046] The first and second chambers each include vertical plates forming chamber walls and a bottom plate for mounting the vertical plates. The first and second chambers are placed into the filter through the top opening of the filter housing. To allow for the resonant component within the filter housing to pass through, the bottom plate has a clearance hole extending through the coupling chamber within the resonant component. The drawer plate is connected to the bottom plate.

[0047] The difference between the first chamber and the second chamber is that the structures of the vertical plates are different. The vertical plates of the first chamber are serpentine structures; while the vertical plates of the second chamber are structures with two T-shaped plates provided on a flat plate.

[0048] In practical applications of this embodiment, both side walls of the housing are provided with slots for quick-release connection to the resonant cavity.

[0049] In some feasible embodiments, a truncated cone is provided on the top of the coupling chamber 41 , the outer diameter of the truncated cone is larger than the diameter of the bottom tube wall of the coupling chamber 41 , and a conductive film 42 is fixedly provided on the inner cavity wall of the coupling chamber 41 .

[0050] Specifically, a cone is provided on the top of the inner cavity of the coupling chamber 41 to increase the size of the inner cavity top. The inner cavity of the coupling chamber 41 is covered with a conductive film 42. The cone and the conductive film 42 improve the coupling strength of the tuning component.

[0051] Thus far, various embodiments of the present invention have been described in detail. To avoid obscuring the concept of the present invention, some details known in the art have been omitted. Based on the above description, those skilled in the art will fully understand how to implement the technical solutions of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A cavity filter, characterized in that: It comprises a filter housing (1), wherein one side of the filter housing is provided with an input end, and the other side of the filter housing is provided with an output end; The filter housing (1) is provided with a tuning component and a quickly detachable resonant cavity; The resonant cavity is fixedly mounted on a draw plate (3); a card slot is provided on the inner wall of the filter housing (1); the draw plate (3) is slidably engaged with the card slot of the filter housing (1); At least two resonant cavities are arranged in the filter housing (1), and the at least two resonant cavities have the same cavity shape or different cavity shapes. The at least two resonant cavities are arranged in the filter housing (1) to form a filtering channel.

2. The cavity filter according to claim 1, characterized in that: A temperature-insulating cavity is provided on the outside of the filter housing (1), and heat dissipation holes are provided on the temperature-insulating cavity wall located on the top of the filter housing (1).

3. The cavity filter according to claim 1, characterized in that: The resonant cavity comprises a bottom plate and a vertical plate arranged on the bottom plate, wherein the vertical plate is a cavity wall of the resonant cavity; the above-mentioned draw plate (3) is also arranged on the bottom plate.

4. The cavity filter according to claim 1, characterized in that: The tuning component comprises a coupling column (43), the coupling column (43) passing through the filter housing (1), a stepped coupling head provided at the bottom of the coupling column (43), the coupling head of the coupling column (43) extending into the filter housing (1), a coupling chamber (41) fixedly mounted at the bottom of the filter housing (1), and the coupling column (43) moving linearly along the axial direction of the coupling chamber in the inner cavity of the coupling chamber (41).

5. The cavity filter according to claim 2, characterized in that: The thermal insulation chamber comprises a heat dissipation plate (21) and a mounting plate (23); the heat dissipation plate (21) is located on the top of the filter housing (1); heat dissipation holes are provided on the heat dissipation plate (21); a plate surface of the thermal insulation chamber that is not provided with heat dissipation holes is provided as the mounting plate (23); the heat dissipation plate (21) and the mounting plate (23) are fixedly mounted on the outside of the filter housing (1) via a support member (22); the heat dissipation plate (21) and the mounting plate (23) are interconnected and combined to form a thermal insulation chamber as a whole.

6. The cavity filter according to claim 4, characterized in that: The coupling chamber (41) is arranged in the filter housing (1); a truncated cone is arranged on the top of the coupling chamber (41); the outer diameter of the truncated cone is larger than the diameter of the bottom tube wall of the coupling chamber (41); a conductive film (42) is fixedly arranged on the inner cavity wall of the coupling chamber (41); the coupling chamber (41) and the bottom plate are arranged to avoid each other; and a avoidance hole for avoiding the coupling chamber (41) is provided on the bottom plate.

7. The cavity filter according to claim 4, characterized in that: A detachable end cover (11) is provided on the top of the filter housing (1), a coupling column (43) is threadedly mounted on the end cover (11), and a coupling head at the bottom of the coupling column (43) is coupled to the inner cavity of the coupling chamber (41).

Images