Metal cavity adjustment-free filter

Abstract

The utility model discloses a screw-adjustment-free filter, belongs to the technical field of filters, and particularly relates to a metal cavity screw-adjustment-free filter which is composed of a filter cavity, an upper cover plate and a resonator. The upper cover plate is fixedly installed at the top of the filtering cavity, and the resonator is located in the filtering cavity; through holes are formed in the top of the upper cover plate and the top of the filtering cavity, firing pins are arranged in the through holes, and the firing pins move up and down to make contact with the two sides of the resonator so that frequency increasing and frequency decreasing can be achieved through deformation of the resonator. Compared with metal adjusting screw deformation, mechanical automatic debugging is more facilitated, compared with cover plate deformation, only frequency reduction can be achieved, bidirectional frequency tuning can be achieved, the product structure is compatible with an original filter with an adjusting screw, product implementation is easy, and cost can be effectively reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field, and in particular relates to a metal cavity adjustment-free screw filter. Background Art

[0002] Metal cavity filters are generally debugged by metal tuning screws. This method is effective in manual debugging, but in automatic debugging, the equipment efficiency is low due to the relatively complex action of screw locking. If the cavity deformation method is used instead of screws, the effect of automatic debugging can be improved and the cost of using screws can be saved.

[0003] Currently, the known technology uses a solution of white deformation of the cavity filter to fine-tune the filter. By performing mechanical impact on the cover plate, pits are formed, thereby adjusting the performance of the filter. Compared with the screw tuning method, this method is simpler to operate for automated debugging, but it also has certain shortcomings. Concave spots will be formed on the surface of the cover plate, and the appearance is not beautiful. Secondly, the pits cannot achieve frequency up-tuning. Utility Model Content

[0004] The purpose of the utility model is to provide a metal cavity adjustment-free screw filter to solve the above-mentioned problems.

[0005] Technical solution: A metal cavity free-adjustable screw filter, the filter is composed of a filter cavity, an upper cover plate and a resonator;

[0006] In a further embodiment, the upper cover is fixedly mounted on the top of the filter cavity, and the resonator is located in the filter cavity;

[0007] In a further embodiment, through holes are opened on the top of the upper cover plate and the top of the filter cavity, and each of the through holes is provided with a striker, which moves up and down to contact two sides of the resonator to achieve frequency up-conversion and frequency down-conversion through deformation of the resonator.

[0008] In a further embodiment, the through hole comprises an upper through hole and a lower through hole, the upper through hole is opened on the upper cover plate, and the lower through hole is opened on the top of the filter cavity.

[0009] In a further embodiment, the firing pin includes an upper firing pin and a lower firing pin, the upper firing pin is located in the upper through hole, and the lower firing pin is located in the lower through hole.

[0010] In a further embodiment, the upper striker and the lower striker are installed parallel to the center line of the resonator to strike two sides of the resonator respectively.

[0011] Beneficial effects: The utility model has the following advantages:

[0012] 1. Through the deformation of the resonator, the frequency can be increased and decreased at the same time, which is more conducive to mechanical automatic debugging than the deformation of the metal adjustment screw.

[0013] 2. Compared with the deformation of the cover, which can only achieve frequency reduction, it can achieve two-way tuning of the frequency.

[0014] 3. The product structure is compatible with the existing filter with adjustment screws, and the product is simple to implement.

[0015] 4. Can effectively reduce costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the filter structure of the utility model.

[0017] Reference numerals: filter cavity 1 , upper cover plate 2 , resonator 3 , upper striker 4 , lower striker 5 . DETAILED DESCRIPTION

[0018] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0019] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0020] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. In addition, the technical features involved in the different embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other.

[0021] A metal cavity adjustment-free screw filter comprises: a filter cavity 1, an upper cover plate 2, a resonator 3, an upper striker 4, and a lower striker 5.

[0022] Embodiment 1:

[0023] like Figure 1 As shown, the filter is composed of a filter cavity, an upper cover plate and a resonator;

[0024] The upper cover plate is fixedly mounted on the top of the filter cavity, and the resonator is located in the filter cavity;

[0025] The upper cover plate and the top of the filter cavity are provided with through holes, and the through holes are provided with strikers. The strikers move up and down to contact the two sides of the resonator to achieve frequency increase and frequency decrease through the deformation of the resonator.

[0026] Embodiment 2:

[0027] like Figure 1 As shown, the through hole includes an upper through hole and a lower through hole, the upper through hole is opened on the upper cover plate, and the lower through hole is opened on the top of the filter cavity.

[0028] Embodiment 3:

[0029] like Figure 1 As shown, the striker includes an upper striker and a lower striker, the upper striker is located in the upper through hole, and the lower striker is located in the lower through hole.

[0030] Embodiment 4:

[0031] like Figure 1 As shown, the upper striker and the lower striker are installed parallel to the center line of the resonator, and strike the two sides of the resonator respectively.

[0032] Working principle: The utility model mainly realizes mechanical adjustment of the filter resonator, thereby realizing the adjustment of the filter frequency. The specific method is as follows:

[0033] Through holes are opened on the front and back surfaces of the cavity filter, so that the upper through hole and the lower through hole are just above and below the resonator.

[0034] If the frequency needs to be increased, the upper striker is used to strike the metal resonator at the upper through hole of the upper cover plate, so that the resonator is deformed downward. As the gap between the resonator and the upper cover plate increases, the capacitance decreases, and the frequency is increased.

[0035] If frequency reduction is required, the metal resonator is struck with a lower striker at the lower through hole of the filter cavity, causing the metal resonator to deform upward. As the gap between the resonator and the upper cover plate decreases and the capacitance increases, frequency reduction is achieved.

[0036] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention of the utility model.

Claims

1. A metal cavity free-adjustable screw filter, characterized in that: The filter is composed of a filter cavity, an upper cover plate and a resonator; The upper cover plate is fixedly mounted on the top of the filter cavity, and the resonator is located in the filter cavity; The upper cover plate and the top of the filter cavity are provided with through holes, and the through holes are provided with strikers. The strikers move up and down to contact the two sides of the resonator to achieve frequency increase and frequency decrease through the deformation of the resonator.

2. According to claim 1, a metal cavity free-adjustment screw filter is characterized in that: The through hole comprises an upper through hole and a lower through hole, wherein the upper through hole is opened on the upper cover plate, and the lower through hole is opened on the top of the filter cavity.

3. According to claim 2, a metal cavity free-adjustment screw filter is characterized in that: The striker includes an upper striker and a lower striker, the upper striker is located in the upper through hole, and the lower striker is located in the lower through hole.

4. A metal cavity adjustment-free screw filter according to claim 3, characterized in that: The upper striker and the lower striker are installed parallel to the center line of the resonator and strike the two sides of the resonator respectively.

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