A strongly coupled miniaturized filter

Abstract

This utility model discloses a strongly coupled miniaturized filter, including a cavity, a cover plate, an input pin, an output pin, a tuning component, multiple resonators, and multiple coupling plates. The cavity has an opening, which is closed by the cover plate. The input pin and the output pin are disposed on the cavity. The resonators are disposed inside the cavity. The tuning component is disposed on the cover plate and opposite to the resonators. One end of the coupling plate is connected to one of the resonators, and the other end is coupled to the input pin, the output pin, and another resonator. This structure achieves high coupling efficiency, reduces the types of materials used to improve production efficiency, and simplifies the installation process. It has significant advantages in terms of cost, processing technology, and performance consistency.

Description

Technical Field

[0001] This utility model relates to the field of filters, and in particular to a strongly coupled miniaturized filter. Background Technology

[0002] Cavity filters are a very important type of filter. Compared with other types of filters, they have a robust structure, stable and reliable performance, small size, moderate Q value, long high-end parasitic passband, and good heat dissipation performance, making them suitable for higher power and frequency applications. Communication base station filters typically consist of a cavity, resonator, cover plate, tuning screw, and input / output connectors. Traditional filters achieve cross-coupling by adding stiffeners and structural capacitors between adjacent cavities to achieve zero-point coupling.

[0003] In cross-coupling, the inductance is achieved by ribs between the two cavities. The height and width of the ribs strengthen or weaken the zero-point coupling; taller and wider ribs result in stronger zero-point coupling, while lower and narrower ribs result in weaker zero-point coupling. For cross-coupling, the capacitance is achieved by adding a structural capacitor between the two cavities. In traditional filters, the structural capacitor consists of a PTFE support and a metal rod. The length of the metal rod affects the coupling strength; longer metal rods result in stronger zero-point coupling, while shorter metal rods result in weaker zero-point coupling.

[0004] In the existing solution, the structural capacitor requires the support base and metal rod to be prefabricated before being assembled onto the cavity, which places high demands on the manufacturing process and has the following drawbacks: 1) Existing filters suffer from problems such as low coupling efficiency, insufficient filtering accuracy, and large size in miniaturization design.

[0005] 2) As electronic devices become thinner and lighter and higher frequency, the requirements for miniaturization and high performance of filters are increasing. Traditional solutions are difficult to implement for ultra-wideband coupling requirements.

[0006] 3) In traditional solutions, the manufacturing cost of structural capacitors is high, resulting in poor market competitiveness.

[0007] Therefore, there is an urgent need for a strongly coupled miniaturized filter to solve the above problems. Utility Model Content

[0008] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a strongly coupled miniaturized filter.

[0009] The technical solution adopted by one embodiment of this utility model to solve its technical problem is: a strongly coupled miniaturized filter, including a cavity, a cover plate, an input PIN pin, an output PIN pin, a tuning component, multiple resonators, and multiple coupling plates; The cavity has an opening, which is closed by a cover plate; The input and output pins are located on the cavity. The resonator is housed within the cavity; The tuning component is mounted on the cover plate and is opposite to the resonator; One end of the coupler is connected to one of the resonators, and the other end is coupled to the input pin, the output pin, and another resonator.

[0010] As one of the preferred embodiments of this utility model, the coupling sheet includes a first source coupling sheet, a second source coupling sheet, and a plurality of cross coupling sheets; One end of the first source coupler is connected to one of the resonators, and the other end is coupled to the input pin. One end of the second source coupler is connected to one of the resonators, and the other end is coupled to the output pin. One end of the cross-coupler is connected to one of the resonators, and the other end is coupled to another resonator.

[0011] As one of the preferred embodiments of this utility model, the first source coupling piece includes a first connecting part, a first bent section and a first coupling part connected in sequence. The first connecting part is connected to one of the resonators, and the first coupling part is coupled to the input PIN pin.

[0012] As one of the preferred embodiments of this utility model, the second source coupling piece includes a second connecting part, a second bent section and a second coupling part connected in sequence. The second connecting part is connected to one of the resonators, and the second coupling part is coupled to the output PIN pin.

[0013] As one of the preferred embodiments of this utility model, the cross-coupling piece includes a third connecting part, a connecting segment and a third coupling part connected in sequence. The third connecting part is connected to one of the resonators, and the third coupling part is coupled to the other resonator.

[0014] As one of the preferred embodiments of this utility model, the third coupling part is arc-shaped and adapted to the resonator.

[0015] As one of the preferred embodiments of this utility model, a strongly coupled miniaturized filter further includes a plurality of first fastening screws, and a resonant platform is disposed in the cavity. The first fastening screws are locked to the resonator, the coupling plate and the resonant platform, so that one end of the coupling plate is clamped between the resonator and the resonant platform.

[0016] As one of the preferred embodiments of this utility model, a strongly coupled miniaturized filter also includes a plurality of second fastening screws, which are locked onto the cover plate and the cavity.

[0017] As one of the preferred embodiments of this utility model, a strongly coupled miniaturized filter also includes multiple supports, with the middle section of the coupling plate supported on the supports.

[0018] As one of the preferred embodiments of this utility model, the coupling sheet is made by sheet metal processing.

[0019] The beneficial effects of this utility model are as follows: A strongly coupled miniaturized filter includes a cavity, a cover plate, an input pin, an output pin, a tuning component, multiple resonators, and multiple coupling plates; the cavity has an opening, which is closed by the cover plate; the input pin and the output pin are disposed on the cavity; the resonators are disposed inside the cavity; the tuning component is disposed on the cover plate and opposite to the resonators; one end of the coupling plate is connected to one of the resonators, and the other end is coupled to the input pin, the output pin, and another resonator; the above structure can achieve high coupling efficiency, while reducing the types of materials to improve production efficiency, and the installation process is simple, with significant advantages in cost, processing technology, and performance consistency. Attached Figure Description

[0020] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of a strongly coupled miniaturized filter. Figure 2 This is a schematic diagram of the first part of a strongly coupled miniaturized filter. Figure 3 This is a schematic diagram of the second part of a strongly coupled miniaturized filter. Figure 4 for Figure 3 A magnified view of a portion of region A in the middle; Figure 5 This is a schematic diagram of the third part of a strongly coupled miniaturized filter. Figure 6 This is a schematic diagram of the fourth part of a strongly coupled miniaturized filter. Detailed Implementation

[0021] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0022] In the description of this utility model, "multiple" means two or more; "greater than," "less than," and "exceeding" are understood to exclude the stated number; "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly specifying the number of indicated technical features or their sequential relationship.

[0023] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0024] In this utility model, unless otherwise explicitly defined, the terms "setting," "installing," and "connecting" should be interpreted broadly. For example, they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to a fixed connection, a detachable connection, or an integral molding; they can refer to a mechanical connection; they can refer to the internal connection of two components or the interaction between two components. Those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0025] Reference Figures 1-6 A strongly coupled miniaturized filter includes a cavity 10, a cover plate 20, an input pin 31, an output pin 32, a tuning component 40, multiple resonators 50, and multiple coupling plates 60. The cavity 10 has an opening 11, and the cover plate 20 closes the opening 11; The input pin 31 and the output pin 32 are disposed on the cavity 10; The resonator 50 is disposed inside the cavity 10; The tuning component 40 is disposed on the cover plate 20 and is opposite to the resonator 50; One end of the coupling plate 60 is connected to one of the resonators 50, and the other end is coupled to the input pin 31, the output pin 32, and another resonator 50.

[0026] In this invention, sheet metal processing is used to manufacture the coupling plate 60, including but not limited to sheet metal stamping and sheet metal bending, to produce the coupling plate 60 with the required shape and coupling parameters. Components such as the cavity 10, cover plate 20, input PIN pin 31, output PIN pin 32, tuning assembly 40, and resonator 50 are also manufactured and prepared. Preferably, the filter further includes multiple first fastening screws 71. A resonant platform 12 is provided inside the cavity 10. The first fastening screws 71 are locked onto the resonator 50, the coupling plate 60, and the resonant platform 12, so that one end of the coupling plate 60 is clamped between the resonator 50 and the resonant platform 12.

[0027] During assembly, one end of each coupling plate 60 is abutted against the upper surface of the corresponding resonant platform 12, and then the resonator 50 is abutted against the upper surface of one end of the coupling plate 60. Then, the first fastening screw 71 locks the resonator 50, the coupling plate 60 and the resonant platform 12 together. Specifically, the resonator 50 has a first through hole, one end of the coupling plate 60 has a second through hole, and the resonant platform 12 has a threaded hole. The first fastening screw 71 passes through the first through hole and the second through hole in sequence and is threaded into the threaded hole. The other end of the coupling plate 60 is adjusted according to the coupling path.

[0028] Reference Figures 2-6 In some embodiments, a strongly coupled miniaturized filter further includes multiple supports 80, with the middle section of the coupling piece 60 supported on the supports; furthermore, multiple partition ribs 13 are provided inside the cavity 10, and adjacent partition ribs 13 are connected by supports 80, thereby dividing the cavity 10 into a resonant cavity 14, with the resonator 50 located inside the resonant cavity 14. Specifically, the supports 80 are provided with two slots, which are respectively inserted into the two partition ribs 13. The supports 80 are also provided with pressure grooves, and the middle section of the coupling piece 60 passes through the pressure grooves, serving to support the coupling piece 60; further still, the upper end face of the supports 80 is provided with positioning grooves, and the cover plate 20 is provided with positioning posts. When the cover plate 20 is connected to the cavity 10, the positioning posts are inserted into the positioning grooves, which can restrict the axial movement of the supports 80.

[0029] Reference Figures 2-6In some embodiments, the coupling plate 60 includes a first source coupling plate 61, a second source coupling plate 62, and a plurality of cross coupling plates 63; one end of the first source coupling plate 61 is connected to one of the resonators 50, and the other end is coupled to the input PIN pin 31; one end of the second source coupling plate 62 is connected to one of the resonators 50, and the other end is coupled to the output PIN pin 32; one end of the cross coupling plate 63 is connected to one of the resonators 50, and the other end is coupled to another resonator 50; specifically, a hybrid scheme of source coupling plates and cross coupling plates is used to achieve cross coupling, and the two sets of source coupling design of the first source coupling plate 61 and the second source coupling plate 62 reduces two sets of conventional capacitor components without adding materials compared with the traditional design; this utility model uses sheet metal technology to construct the transmission zero point of the filter, ensuring mechanical stability, and can adjust the distribution of the electromagnetic field by the shape and size of the sheet metal sheet to achieve the requirement of strong coupling bandwidth.

[0030] Reference Figures 2-4 In some embodiments, the first source coupling piece 61 includes a first connecting portion 611, a first bent section 612, and a first coupling portion 613 connected in sequence. The first connecting portion 611 is connected to one of the resonators 50, and the first coupling portion 613 is coupled to the input PIN pin 31. (Refer to...) Figures 2-3 , Figure 5 In some embodiments, the second source coupling piece 62 includes a second connecting portion 621, a second bent section 622, and a second coupling portion 623 connected in sequence. The second connecting portion 621 is connected to one of the resonators 50, and the second coupling portion 623 is coupled to the output PIN pin 32. Specifically, the first connecting portion 611 and the second connecting portion 621 are provided with second through holes, and the first fastening screw 71 passes through the second through holes to complete the connection and fixation of the first source coupling piece 61 and the second source coupling piece 62 to the resonator 50.

[0031] Reference Figures 2-4 , Figure 6 In some embodiments, the cross-coupling piece 63 includes a third connecting part 631, a connecting segment 632 and a third coupling part 633 connected in sequence. The third connecting part 631 is connected to one of the resonators 50, and the third coupling part 633 is coupled to the other of the resonators 50. Specifically, the third connecting part 631 is provided with a second through hole, and the first fastening screw 71 passes through the second through hole to complete the connection and fixation of the cross-coupling piece 63 and the resonator 50.

[0032] Reference Figures 2-4 , Figure 6 In some embodiments, the third coupling part 633 is arc-shaped and adapted to the resonator 50; the distribution of the electromagnetic field is controlled by changing the shape and size of the third coupling part 633 to achieve the requirement of a strong coupling bandwidth.

[0033] Reference Figure 1 In some embodiments, a strongly coupled miniaturized filter further includes a plurality of second fastening screws 72, which are locked onto the cover plate 20 and the cavity 10.

[0034] The advantages of this utility model are: the above structure can achieve high coupling efficiency, while reducing the types of materials to improve production efficiency, the installation process is simple, and it has great advantages in terms of cost, processing technology and performance consistency.

[0035] Of course, this utility model is not limited to the above-described embodiments. Those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of this utility model. All such equivalent modifications and substitutions are included within the scope defined by the claims of this application.

Claims

1. A strongly coupled miniaturized filter, characterized in that: It includes a cavity (10), a cover plate (20), an input pin (31), an output pin (32), a tuning assembly (40), multiple resonators (50), and multiple coupling plates (60); The cavity (10) has an opening (11), and the cover plate (20) closes the opening (11). The input PIN (31) and the output PIN (32) are disposed on the cavity (10); The resonator (50) is disposed within the cavity (10); The tuning component (40) is disposed on the cover plate (20) and opposite to the resonator (50); One end of the coupling plate (60) is connected to one of the resonators (50), and the other end is coupled to the input pin (31), the output pin (32), and the other of the resonators (50).

2. The strongly coupled miniaturized filter according to claim 1, characterized in that: The coupling plate (60) includes a first source coupling plate (61), a second source coupling plate (62), and a plurality of cross coupling plates (63). One end of the first source coupling piece (61) is connected to one of the resonators (50), and the other end is coupled to the input PIN pin (31); One end of the second source coupling piece (62) is connected to one of the resonators (50), and the other end is coupled to the output PIN pin (32); One end of the cross-coupled piece (63) is connected to one of the resonators (50), and the other end is coupled to the other of the resonators (50).

3. A strongly coupled miniaturized filter according to claim 2, characterized in that: The first source coupling piece (61) includes a first connecting part (611), a first bent section (612) and a first coupling part (613) connected in sequence. The first connecting part (611) is connected to one of the resonators (50), and the first coupling part (613) is coupled to the input PIN pin (31).

4. A strongly coupled miniaturized filter according to claim 2, characterized in that: The second source coupling piece (62) includes a second connecting part (621), a second bent section (622) and a second coupling part (623) connected in sequence. The second connecting part (621) is connected to one of the resonators (50), and the second coupling part (623) is coupled to the output PIN pin (32).

5. A strongly coupled miniaturized filter according to claim 2, characterized in that: The cross-coupled piece (63) includes a third connecting part (631), a connecting segment (632) and a third coupling part (633) connected in sequence. The third connecting part (631) is connected to one of the resonators (50), and the third coupling part (633) is coupled to the other of the resonators (50).

6. A strongly coupled miniaturized filter according to claim 5, characterized in that: The third coupling part (633) is arc-shaped and adapted to the resonator (50).

7. A strongly coupled miniaturized filter according to claim 1, characterized in that: It also includes a plurality of first fastening screws (71), and a resonant stage (12) is provided in the cavity (10). The first fastening screws (71) are locked onto the resonator (50), the coupling plate (60) and the resonant stage (12) so that one end of the coupling plate (60) is clamped between the resonator (50) and the resonant stage (12).

8. A strongly coupled miniaturized filter according to claim 1, characterized in that: It also includes a plurality of second fastening screws (72) that are locked onto the cover plate (20) and the cavity (10).

9. A strongly coupled miniaturized filter according to claim 1, characterized in that: It also includes multiple supports (80), on which the middle section of the coupling piece (60) is supported.

10. A strongly coupled miniaturized filter according to claim 1, characterized in that: The coupling piece (60) is made by sheet metal processing.

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