Novel metal plate filter

Abstract

The utility model discloses a novel sheet metal filter which comprises a cavity, a sheet metal resonator assembly and a tuning screw assembly. The cavity is provided with an opening for communicating an inner cavity of the cavity with an external space, and a separation rib is arranged in the inner cavity of the cavity. The part, opposite to the opening, in the inner wall of the cavity is the inner bottom wall of the cavity, and a cavity resonator is arranged on the inner bottom wall of the cavity in a protruding mode. The metal plate resonator assembly comprises a bottom plate and a metal plate resonator, the bottom plate covers the opening of the cavity, and the metal plate resonator is connected to the bottom plate and located in the inner cavity of the cavity. The metal plate resonator is matched with the cavity resonator to realize capacitive coupling, so that the required resonant frequency of the filter is achieved, the Q value of a resonant cavity formed by the cavity and the bottom plate is high, the insertion loss of the filter is reduced, and the performance of the filter is improved. The tuning screw assembly comprises a plurality of tuning screws, the tuning screws are connected to the cavity, and the tuning screws penetrate through the cavity from the outside of the cavity to enter the inner cavity of the cavity.

Description

Technical Field

[0001] The utility model belongs to the technical field of filters, and in particular relates to a new type of 5G miniaturized sheet metal filter suitable for base station filters. Background Art

[0002] With the development of the communications industry, base station filters are becoming increasingly miniaturized, and sheet metal filters, in particular, are becoming increasingly popular in 5G applications. Furthermore, the Q value of sheet metal filters is lower than that of traditional metal coaxial filters, which has a certain impact on the filter's insertion loss. Insertion loss reflects the filter's attenuation of the input signal and the filter's impact on other components. Therefore, improving the Q value of sheet metal filters to reduce filter losses is particularly important.

[0003] The traditional sheet metal filter has a lower Q value than the traditional metal coaxial filter and a larger insertion loss. If the same insertion loss is to be achieved, not only a larger size is required, but also the cost and weight are increased. Utility Model Content

[0004] In response to the above problems, the present invention provides a new sheet metal filter, which achieves a higher Q value at the same size, reduces the insertion loss of the filter, reduces the cavity size while meeting performance indicators, and reduces the cavity cost.

[0005] The technical solution of the utility model is:

[0006] A new sheet metal filter, comprising:

[0007] A cavity, wherein the cavity is provided with an opening for connecting the inner cavity of the cavity with the external space, and the inner cavity of the cavity is provided with a partition rib; the portion of the inner wall of the cavity opposite to the opening is the inner bottom wall of the cavity, and the inner bottom wall of the cavity is protruded with a cavity resonator;

[0008] A sheet metal resonator assembly comprises a base plate and a sheet metal resonator, wherein the base plate covers the opening of the cavity, the sheet metal resonator is connected to the base plate and is located within the inner cavity of the cavity; the sheet metal resonator cooperates with the cavity resonator to achieve capacitive coupling;

[0009] The tuning screw assembly comprises a plurality of tuning screws, wherein the plurality of tuning screws are respectively connected to the cavity, and the tuning screws pass through the cavity from the outside of the cavity and enter the inner cavity of the cavity.

[0010] In the novel sheet metal filter provided in a preferred embodiment, a plurality of cavity resonators are protrudingly provided on the inner bottom wall of the cavity.

[0011] In the novel sheet metal filter provided in a preferred embodiment, the plane where the cavity resonator is located is parallel to the plane where the sheet metal resonator is located.

[0012] In the novel sheet metal filter provided in a preferred embodiment, the cavity resonator is integrally formed with the cavity.

[0013] In a novel sheet metal filter provided in a preferred embodiment, a signal receiving end and a signal output end of the novel sheet metal filter are provided on the sheet metal resonator.

[0014] In the novel sheet metal filter provided in a preferred embodiment, two first through holes are provided on the bottom plate, and the two first through holes are used for installing the signal receiving end and the signal output end respectively.

[0015] In the new sheet metal filter provided in a preferred embodiment, the signal receiving end and the signal output end are respectively mounted on their respective corresponding non-metallic dielectric mounting bases, and the signal receiving end and the signal output end are respectively mounted on the corresponding first through holes on the base plate through the corresponding non-metallic dielectric mounting bases.

[0016] In a novel sheet metal filter provided in a preferred embodiment, a plurality of second through holes are provided on the inner bottom wall of the cavity, and the second through holes correspond one-to-one to the tuning screws, and the tuning screws enter the inner cavity of the cavity from the outside of the cavity through the second through holes.

[0017] In a new sheet metal filter provided by a preferred embodiment, an internal thread is provided in the through hole; the tuning screw assembly also includes a plurality of nuts, which correspond one-to-one to the tuning screws, and the tuning screws pass through the corresponding nuts and the second through holes and are threadedly connected to the nuts and the second through holes respectively.

[0018] Due to the adoption of the above technical solution, the present invention has the following advantages and positive effects compared with the prior art:

[0019] The novel sheet metal filter provided by the present invention has a cavity resonator provided in the cavity. The cavity resonator and the sheet metal resonator can realize capacitive coupling, thereby achieving the required resonant frequency, so that the resonant cavity composed of the cavity and the bottom plate (that is, the inner cavity space on the cavity after the opening on the cavity is covered by the bottom plate) has a high Q value, thereby reducing the filter insertion loss and improving the filter performance.

[0020] Furthermore, the cavity resonator and the cavity can be made in one piece, for example, by injection molding together. Therefore, the novel sheet metal filter provided by the present invention is easy to manufacture and has low manufacturing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] By reading the detailed description of the preferred embodiment below, various other advantages and benefits will become clear to those skilled in the art. The accompanying drawings are only for illustrating the preferred embodiment and are not to be considered as limiting the present invention.

[0022] Figure 1 This is a structural diagram of a novel sheet metal filter of the present utility model;

[0023] Figure 2 and Figure 3 This is a schematic structural diagram of a sheet metal resonator assembly of the present invention;

[0024] Figure 4 This is a structural schematic diagram of a cavity, its internal partition ribs, and the cavity resonator of the present invention.

[0025] Description of reference numerals:

[0026] 1: Cavity; 2: Sheet metal resonator assembly; 3: Tuning screw assembly; 4: Bottom plate; 5: First component; 6: Second component; 7: Third component; 8: Non-metallic dielectric mounting base; 9: First through hole; 10: Mounting slot; 11: Second through hole; 12: Spacing rib; 13: Cavity resonator; 14: Tuning screw; 15:

[0027] nut. DETAILED DESCRIPTION

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without inventive work.

[0029] To simplify the drawings, only the parts relevant to the present invention are schematically shown in each figure. They do not represent the actual structure of the product. In addition, to simplify the drawings and facilitate understanding, in some figures, only one of the components with the same structure or function is schematically depicted or labeled. In this document, "one" not only means "only one" but also "more than one."

[0030] See Figures 1 to 4 This embodiment provides a new sheet metal filter, including a cavity 1, a sheet metal resonator assembly 2 and a tuning screw assembly 3.

[0031] The cavity 1 is provided with an opening for connecting the inner cavity of the cavity 1 with the external space, and a partition rib 12 is provided in the inner cavity of the cavity 1. The portion of the inner wall of the cavity 1 opposite the opening is the inner bottom wall of the cavity 1, and a cavity resonator 13 is protruded on the inner bottom wall of the cavity 1.

[0032] The sheet metal resonator assembly 2 includes a base plate 4 and a sheet metal resonator. Base plate 4 covers the opening of cavity 1. Once the base plate 4 covers the opening of cavity 1, it seals the opening. After the opening of cavity 1 is sealed, the interior of cavity 1 forms the resonant cavity (i.e., the filter air dielectric cavity) of the novel sheet metal filter of this embodiment.

[0033] The sheet metal resonator is connected to the bottom plate 4 and is located in the inner cavity of the cavity 1. The sheet metal resonator cooperates with the cavity resonator 13 to achieve capacitive coupling. The plane where the cavity resonator 13 is located is parallel to the plane where the sheet metal resonator is located. By adjusting the distance between the cavity resonator 13 and the sheet metal resonator during design (that is, the distance between the plane where the cavity resonator 13 is located and the plane where the sheet metal resonator is located) to achieve capacitive coupling, the required resonant frequency can be achieved, which makes the resonant cavity Q value of the novel sheet metal filter of this embodiment high, thereby improving the filter performance.

[0034] A plurality of cavity resonators 13 are protruding from the inner bottom wall of the cavity 1; the cavity resonators 13 can be integrally formed with the cavity 1. Preferably, the cavity 1 and the partition ribs 12 in the inner cavity of the cavity 1 and the cavity resonators 13 can be injection molded together. Such a structure is easy to manufacture and has low manufacturing cost.

[0035] The signal receiving end and signal output end of the novel sheet metal filter of this embodiment are arranged on the sheet metal resonator, and two first through holes 9 are provided on the bottom plate 4, and the two first through holes 9 are used to install the signal receiving end and the signal output end respectively. Figure 2 and Figure 3 As shown, the sheet metal resonator includes a first component 5, a second component 6, and a third component 7. The first component 5 is provided with the aforementioned signal receiving terminal, and the second component 6 is provided with the aforementioned signal output terminal. The first component 5, the second component 6, and the third component 7 are respectively mounted within mounting slots 10 defined in the base plate 4. Specifically, the connections can be made by plugging, and welding or other methods can be used to further secure the connection between the first component 5, the second component 6, and the third component 7 and the base plate 4. The signal receiving terminal and the signal output terminal can each be mounted on a corresponding non-metallic dielectric mounting seat 8. The signal receiving terminal and the signal output terminal are each mounted to a corresponding first through-hole 9 in the base plate 4 via the corresponding non-metallic dielectric mounting seat 8. The non-metallic dielectric mounting seat 8 primarily serves to secure the signal receiving terminal and the signal output terminal.

[0036] The tuning screw assembly 3 includes several tuning screws 14, which are respectively connected to the cavity 1, and the tuning screws 14 pass through the cavity 1 from the outside of the cavity 1 and enter the inner cavity of the cavity 1; the coupling strength can be adjusted by adjusting the size process of the tuning screw 14 entering the inner cavity of the cavity 1.

[0037] Specifically, the inner bottom wall of the cavity 1 is provided with a plurality of second through-holes 11, each corresponding to a tuning screw 14. The tuning screw 14 enters the inner cavity of the cavity 1 from the outside through the second through-holes 11. The second through-holes 11 are internally threaded. The tuning screw assembly 3 also includes a plurality of nuts 15, each corresponding to a tuning screw 14. The tuning screw 14 passes through the corresponding nut 15 and the second through-hole 11 and is threadedly connected to the nut 15 and the through-hole, respectively.

[0038] Traditional sheet metal filters have lower Q values and higher insertion losses than traditional metal coaxial filters. To achieve the same insertion loss, not only does a larger size become necessary, but the cost and weight also increase. The novel sheet metal filter provided in this embodiment has a higher Q value and simpler structure than traditional sheet metal filters of the same size. That is, the novel sheet metal filter provided in this embodiment achieves a higher Q value at the same size, reduces filter insertion loss, and reduces filter size and cost while meeting performance indicators.

[0039] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, if these changes fall within the scope of the claims of the present invention and their equivalents, they will still fall within the scope of protection of the present invention.

Claims

1. A new sheet metal filter, characterized in that: include: A cavity, wherein the cavity is provided with an opening for connecting the inner cavity of the cavity with the external space, and the inner cavity of the cavity is provided with a partition rib; the portion of the inner wall of the cavity opposite to the opening is the inner bottom wall of the cavity, and the inner bottom wall of the cavity is protruded with a cavity resonator; A sheet metal resonator assembly, comprising a bottom plate and a sheet metal resonator, wherein the bottom plate covers the opening of the cavity, and the sheet metal resonator is connected to the bottom plate and located in the inner cavity of the cavity; The sheet metal resonator cooperates with the cavity resonator to achieve capacitive coupling; The tuning screw assembly comprises a plurality of tuning screws, wherein the plurality of tuning screws are respectively connected to the cavity, and the tuning screws pass through the cavity from the outside of the cavity and enter the inner cavity of the cavity.

2. The novel sheet metal filter according to claim 1, characterized in that: A plurality of cavity resonators are protrudingly provided on the inner bottom wall of the cavity.

3. The novel sheet metal filter according to claim 1 or 2, characterized in that: The plane where the cavity resonator is located is parallel to the plane where the sheet metal resonator is located.

4. The novel sheet metal filter according to claim 1 or 2, characterized in that: The cavity resonator is made integrally with the cavity.

5. The novel sheet metal filter according to claim 1, characterized in that: The signal receiving end and the signal output end of the novel sheet metal filter are arranged on the sheet metal resonator.

6. The novel sheet metal filter according to claim 5, characterized in that: The bottom plate is provided with two first through holes, and the two first through holes are used for installing the signal receiving end and the signal output end respectively.

7. The novel sheet metal filter according to claim 6, characterized in that: The signal receiving end and the signal output end are respectively mounted on their corresponding non-metallic medium mounting seats, and the signal receiving end and the signal output end are respectively mounted on the corresponding first through holes on the bottom plate through the corresponding non-metallic medium mounting seats.

8. The novel sheet metal filter according to claim 1, characterized in that: A plurality of second through holes are provided on the inner bottom wall of the cavity. The second through holes correspond to the tuning screws one by one. The tuning screws enter the inner cavity of the cavity from the outside of the cavity through the second through holes.

9. The novel sheet metal filter according to claim 8, characterized in that: An internal thread is provided in the through hole; the tuning screw assembly also includes a plurality of nuts, which correspond one to one with the tuning screws. The tuning screws pass through the corresponding nuts and the second through holes and are threadedly connected with the nuts and the second through holes respectively.

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