A novel resonator connection structure and a cavity filter

Abstract

The utility model discloses a novel resonator connecting structure and cavity filter, resonator connecting structure includes resonator and cavity or cover, and resonator has the first stage platform of being close to cavity or cover and the second stage platform of being far away from cavity, and the connecting platform is provided on cavity or cover, still includes first abutting piece, second abutting piece and connecting piece, and the lower end surface of first abutting piece and connecting platform abuts, and the upper end surface of second abutting piece and second stage platform abuts, and connecting piece is connected with first abutting piece and second abutting piece respectively to make resonator install on the connecting platform, can avoid the stress concentration and the risk of sliding tooth of slender screw through above -mentioned structure, significantly improve the anti -vibration ability, be applicable to miniaturization coaxial cavity filter, especially the form of resonator setting for bottom slender structure, and moreover also do not influence the consistency of resonator height, satisfy the use demand.

Description

Technical Field

[0001] This utility model relates to the field of filters, and in particular to a novel resonator connection structure and cavity filter. Background Technology

[0002] Cavity filters are a very important type of filter. Compared with other types of filters, they have the advantages of robust structure, stable and reliable performance, small size, moderate Q value, long high-end parasitic passband, and good heat dissipation performance, and can be used for higher power and frequency applications.

[0003] A cavity filter typically consists of a cavity 200, a resonator 100, a cover plate, a tuning assembly, and input / output connectors; see reference. Figure 1 In 5G scenarios, due to frequency and temperature drift compensation requirements, the resonator 100 needs to be designed with a slender bottom structure. The cylindrical portion cannot accommodate the screw head. The usual solution is to elongate the screw 210 and place the screw head on the secondary platform of the resonator 100. However, this installation method of the resonator 100 introduces reliability risks.

[0004] 1. Due to the small diameter and poor strength of the screw 210, the slender shaft cannot withstand a large torque, which further leads to stripping and stress loosening risks.

[0005] 2. The screw head is set on the second-stage step of the resonator. The tensile stress caused by the large torque of the screw 210 will cause the resonator 100 to be compressed in the height direction, resulting in a lack of height uniformity of the resonator 100 in the entire filter.

[0006] 3. The mechanical properties of the screw threads in the cavity or cover plate are significantly weaker than those of the standard nut material, which affects the firmness of the screw 210 connection;

[0007] Therefore, there is an urgent need for a new type of resonator connection structure and cavity filter to solve the above problems. Utility Model Content

[0008] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a novel resonator connection structure and cavity filter.

[0009] The technical solution adopted by one embodiment of this utility model to solve its technical problem is: a novel resonator connection structure, including a resonator and a cavity or cover plate. The resonator has a primary platform near the cavity or cover plate and a secondary platform away from the cavity. A connection platform is provided on the cavity or cover plate. It also includes a first abutment, a second abutment and a connector. The first abutment abuts against the lower end face of the connection platform, the second abutment abuts against the upper end face of the secondary platform, and the connector is connected to the first abutment and the second abutment respectively, so that the resonator is mounted on the connection platform.

[0010] As one of the preferred embodiments of this utility model, a resonant platform is provided on the cavity. The upper part of the resonant platform is provided with a first through groove and the lower part is provided with a second through groove. The second through groove is connected to the outside of the cavity. The groove diameter of the first through groove is smaller than the groove diameter of the second through groove, so that a connecting platform is constructed on the upper part of the resonant platform.

[0011] As one of the preferred embodiments of this utility model, a novel resonator connection structure further includes a screw and a nut. The nut abuts against the upper end face of the secondary platform. The screw has a head and a rod. The head abuts against the lower end face of the connecting platform. The rod passes through the resonator and is threadedly connected to the nut. The first abutting member is formed by the head, the second abutting member is formed by the nut, and the connecting member is formed by the rod.

[0012] In one of the preferred embodiments of this utility model, the nut is connected to the resonator through a limiting structure to limit the relative rotation between the nut and the resonator.

[0013] As one of the preferred embodiments of this utility model, the limiting structure includes a limiting groove disposed on the resonator and a limiting block disposed on the nut. The cross-sectional outlines of the limiting groove and the limiting block are non-circular, and the limiting block extends into the limiting groove.

[0014] As one of the preferred embodiments of this utility model, the cross-sectional outline of the limiting groove and the limiting block is set as a regular hexagon.

[0015] As a preferred embodiment of the present invention, a novel resonator connection structure further includes a first pull rivet, which includes a first rivet body and a first rivet core. The first rivet body has a first fixing head and a first rod body, and the first rivet core has a second fixing head and a second rod body. The first fixing head abuts against the lower end face of the connecting platform, the first rod body is disposed on the secondary platform, and the second rod body is disposed on the first rod body, so that the second fixing head abuts against the first rod body, causing the first rod body to fold outward to form a first flange abutting against the upper end face of the secondary platform. The first fixing head constitutes a first abutting member, the second fixing head constitutes a second abutting member, and the first rod body and the second rod body constitute a connecting member.

[0016] As a preferred embodiment of the present invention, a novel resonator connection structure further includes a second pull rivet, which includes a second rivet body and a second rivet core. The second rivet body has a third fixing head and a third rod body, and the second rivet core has a fourth fixing head and a fourth rod body. The third fixing head abuts against the upper end face of the secondary platform, the third rod body is disposed on the connecting platform, and the fourth rod body is disposed on the third rod body, so that the fourth fixing head abuts against the third rod body, causing the third rod body to fold outward to form a second flange abutting against the lower end face of the connecting platform. The third fixing head constitutes a first abutting member, the fourth fixing head constitutes a second abutting member, and the third rod body and the fourth rod body constitute a connecting member.

[0017] As one of the preferred embodiments of this utility model, a novel resonator connection structure further includes a washer that abuts against the upper end face of the secondary platform, and the first flange abuts against the washer.

[0018] A cavity filter includes the aforementioned resonator connection structure.

[0019] The beneficial effects of this utility model are as follows: A novel resonator connection structure and cavity filter are provided. The resonator connection structure includes a resonator and a cavity or cover plate. The resonator has a primary platform near the cavity or cover plate and a secondary platform away from the cavity. A connection platform is provided on the cavity or cover plate. The structure also includes a first abutment, a second abutment, and a connector. The first abutment abuts against the lower end face of the connection platform, the second abutment abuts against the upper end face of the secondary platform, and the connector is connected to the first and second abutments respectively, so that the resonator is mounted on the connection platform. The above structure can avoid stress concentration and stripping risk of slender screws, significantly improve vibration resistance, and is suitable for miniaturized coaxial cavity filters, especially when the resonator is set as a slender structure at the bottom. Moreover, it does not affect the consistency of the resonator height, thus meeting the usage requirements. 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:

[0021] Figure 1 This is a schematic diagram of the existing resonator connection structure;

[0022] Figure 2 This is a schematic diagram of the first structure of a novel resonator connection structure;

[0023] Figure 3 This is a schematic diagram of the resonator and nut.

[0024] Figure 4 This is a schematic diagram of the second structure of a novel resonator connection structure. Detailed Implementation

[0025] 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.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] Reference Figures 2-4 This utility model provides a novel resonator connection structure, including a resonator 100 and a cavity 200 or a cover plate. The resonator 100 has a primary platform 110 near the cavity 200 or the cover plate and a secondary platform 120 away from the cavity 200. A connection platform 300 is provided on the cavity 200 or the cover plate. It also includes a first abutment 400a, a second abutment 400b and a connector 400c. The first abutment 400a abuts against the lower end face of the connection platform 300, the second abutment 400b abuts against the upper end face of the secondary platform 120, and the connector 400c is connected to the first abutment 400a and the second abutment 400b respectively, so that the resonator 100 is mounted on the connection platform 300.

[0030] Reference Figures 2-4 In some embodiments, a resonant stage 500 is provided on the cavity 200. The upper part of the resonant stage 500 is provided with a first through groove 510 and the lower part is provided with a second through groove 520. The second through groove 520 communicates with the outside of the cavity 200. The groove diameter of the first through groove 510 is smaller than the groove diameter of the second through groove 520, so that the upper part of the resonant stage 500 forms a connecting platform 300.

[0031] Specifically, during assembly, the resonator 100 is placed on the resonator platform 500, so that the primary platform 110 of the resonator 100 abuts against the connecting platform 300, and is fixed using a special jig. In some embodiments, at least one of the first supporting member 400a and the second supporting member 400b is a separate structure from the connecting member 400c. In a preferred embodiment, the first supporting member 400a and the connecting member 400c are an integral structure, and the second supporting member 400b is an independent component. The connecting member 400c is passed from bottom to top through the second through groove 520 and the first through groove 520. The slot 510, the primary platform 110, and the secondary platform 120 allow the first abutment 400a to abut against the lower end face of the connecting platform 300. Then, the second abutment 400b is placed inside the resonator 100 and connected to the other end of the connector 400c, so that the resonator 100 and the cavity 200 are assembled together. This avoids stress concentration and stripping risk of slender screws, significantly improves vibration resistance, and is suitable for miniaturized coaxial cavity filters, especially when the resonator is set with a slender bottom structure. It also does not affect the consistency of the resonator height, thus meeting the usage requirements.

[0032] ①Reference Figures 2-3 As a first embodiment of the present invention, a novel resonator connection structure further includes a screw 610 and a nut 620. The nut 620 abuts against the upper end face of the secondary platform 120. The screw 610 has a head 611 and a rod 612. The head 611 abuts against the lower end face of the connecting platform 300. The rod 612 passes through the resonator 100 and is threadedly connected to the nut 620. The first supporting member 400a is composed of the head 611, the second supporting member 400b is composed of the nut 620, and the connecting member 400c is composed of the rod 612.

[0033] Specifically, during assembly, the nut 620 is placed inside the resonator 100 and abuts against the upper end face of the secondary platform 120. The rod 612 of the screw 610 passes through the second through slot 520, the first through slot 510, the primary platform 110, and the secondary platform 120 from bottom to top, so that the head 611 of the screw 610 abuts against the lower end face of the connecting platform 300, while the rod 612 is threadedly connected to the nut 620. The resonator 100 and the cavity 200 are assembled together by the pull between the screw 610 and the nut 620. Of course, the nut 620 can also be placed inside the second through slot 520 and abut against the upper end face of the connecting platform 300. The lower end face of the screw 610 abuts against the upper end face of the secondary platform 120, the primary platform 110, the first through groove 510 and the second through groove 520 from top to bottom, so that the head 611 of the screw 610 abuts against the upper end face of the secondary platform 120, while the rod 612 is threadedly connected to the nut 620. The resonator 100 and the cavity 200 are assembled together by the pull of the screw 610 and the nut 620. Furthermore, since the threaded groove on the cavity 20 or the cover plate is removed, the screw 620 is directly threadedly connected to the nut 620, which has better mechanical properties and brings better connection firmness.

[0034] Reference Figures 2-3 In some embodiments, the nut 620 is connected to the resonator 100 via a limiting structure 700 to restrict relative rotation between the nut 620 and the resonator 100. Preferably, the limiting structure 700 includes a limiting groove 710 on the resonator 100 and a limiting block 720 on the nut 620. The cross-sectional outlines of the limiting groove 710 and the limiting block 720 are non-circular, and the limiting block 720 extends into the limiting groove 710. More preferably, the cross-sectional outlines of the limiting groove 710 and the limiting block 720 are regular hexagonal. This configuration enables the resonator 100 to have its own limiting structure, preventing the nut 620 from rotating within the resonator 100, which is beneficial for improving assembly efficiency and assembly effect.

[0035] ②Reference Figure 4As a second embodiment of the present invention, a novel resonator connection structure further includes a first pull rivet 800. The first pull rivet 800 includes a first rivet body 810 and a first rivet core 820. The first rivet body 810 has a first fixing head 811 and a first rod body 812. The first rivet core 820 has a second fixing head 821 and a second rod body 822. The first fixing head 811 abuts against the lower end face of the connecting platform 300. The first rod body 812 passes through the secondary platform 120. The second rod body 822 passes through the first rod body 812, so that the second fixing head 821 abuts against the first rod body 812, so that the first rod body 812 folds outward to form a first flange 813 that abuts against the upper end face of the secondary platform 120. The first fixing head 811 constitutes a first abutting member 400a. The second fixing head 821 constitutes a second abutting member 400b. The first rod body 812 and the second rod body 822 constitute a connecting member 400c.

[0036] Specifically, during assembly, the first blind rivet 800 passes through the second through slot 520, the first through slot 510, the primary platform 110, and the secondary platform 120 from bottom to top, so that the first fixing head 811 abuts against the lower end face of the connecting platform 300. Then, the second rod body 822 is pulled by the riveting device to drive the second fixing head 821 to squeeze the end of the first rod body 812, so that the first rod body 812 folds outward to form a first flange 813 that abuts against the upper end face of the secondary platform 120, thereby realizing the assembly of the resonator 100 and the cavity 200. In a further embodiment, a novel resonator connection structure also includes a washer 900 that abuts against the upper end face of the secondary platform 120, and the first flange 813 abuts against the washer 900. By setting the washer 900, the tensile stress of the first blind rivet 800 is dispersed, and the problem of the small platform of the resonator 100 due to the rounded corners of the stamping process is solved.

[0037] ③ As a third embodiment of this utility model, a novel resonator connection structure further includes a second pull rivet. The second pull rivet includes a second rivet body and a second rivet core. The second rivet body has a third fixing head and a third rod body. The second rivet core has a fourth fixing head and a fourth rod body. The third fixing head abuts against the upper end face of the secondary platform 120. The third rod body is disposed on the connecting platform 300. The fourth rod body is disposed on the third rod body, so that the fourth fixing head abuts against the third rod body, so that the third rod body folds outward to form a second flange abutting against the lower end face of the connecting platform 300. The third fixing head constitutes a first abutting member 400a, the fourth fixing head constitutes a second abutting member 400b, and the third rod body and the fourth rod body constitute a connecting member 400c. The difference between this embodiment and the second embodiment is that the second pull rivet passes through the resonator 100 and the cavity 200 from top to bottom, which will not be described in detail here.

[0038] This utility model also provides a cavity filter, including the resonator connection structure described above.

[0039] The advantages of this invention are: the structure described above can avoid stress concentration and stripping risk of slender screws, significantly improve vibration resistance, and is suitable for miniaturized coaxial cavity filters, especially when the resonator is set with a slender bottom structure, without affecting the consistency of the resonator height, thus meeting the usage requirements.

[0040] 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 novel resonator connection structure comprising a resonator (100) and a cavity (200) or a cover plate, characterized by: The resonator (100) has a primary platform (110) near the cavity (200) or cover plate and a secondary platform (120) away from the cavity (200). The cavity (200) or cover plate is provided with a connecting platform (300). It also includes a first abutment (400a), a second abutment (400b) and a connector (400c). The first abutment (400a) abuts against the lower end face of the connecting platform (300), the second abutment (400b) abuts against the upper end face of the secondary platform (120), and the connector (400c) is connected to the first abutment (400a) and the second abutment (400b) respectively, so that the resonator (100) is mounted on the connecting platform (300).

2. A novel resonator connection structure according to claim 1, characterized by: A resonant platform (500) is provided on the cavity (200). The upper part of the resonant platform (500) is provided with a first through groove (510) and the lower part is provided with a second through groove (520). The second through groove (520) communicates with the outside of the cavity (200). The groove diameter of the first through groove (510) is smaller than the groove diameter of the second through groove (520) so that the upper part of the resonant platform (500) forms the connecting platform (300).

3. A novel resonator connection structure according to claim 1, characterized by: It also includes a screw (610) and a nut (620), the nut (620) abutting against the upper end face of the secondary platform (120), the screw (610) having a head (611) and a rod (612), the head (611) abutting against the lower end face of the connecting platform (300), the rod (612) passing through the resonator (100) and threadedly connected to the nut (620), the first abutting member (400a) being formed by the head (611), the second abutting member (400b) being formed by the nut (620), and the connecting member (400c) being formed by the rod (612).

4. A novel resonator connection structure according to claim 3, characterized by: The nut (620) is connected to the resonator (100) via a limiting structure (700) to limit the relative rotation between the nut (620) and the resonator (100).

5. The novel resonator connection structure according to claim 4, characterized in that: The limiting structure (700) includes a limiting groove (710) disposed on the resonator (100) and a limiting block (720) disposed on the nut (620). The cross-sectional outlines of the limiting groove (710) and the limiting block (720) are non-circular, and the limiting block (720) extends into the limiting groove (710).

6. The novel resonator connection structure according to claim 5, characterized in that: The cross-sectional outlines of the limiting groove (710) and the limiting block (720) are set as regular hexagons.

7. The novel resonator connection structure according to claim 1, characterized in that: It also includes a first pop rivet (800), which includes a first rivet body (810) and a first rivet core (820). The first rivet body (810) has a first fixing head (811) and a first rod body (812). The first rivet core (820) has a second fixing head (821) and a second rod body (822). The first fixing head (811) abuts against the lower end face of the connecting platform (300). The first rod body (812) passes through the secondary platform (120). The second rod body (822)... 2) The second fixing head (821) is inserted into the first rod body (812) and abuts against the first rod body (812) so that the first rod body (812) is folded outward to form a first flange (813) that abuts against the upper end face of the secondary platform (120). The first fixing head (811) constitutes the first abutment (400a), the second fixing head (821) constitutes the second abutment (400b), and the first rod body (812) and the second rod body (822) constitute the connector (400c).

8. The novel resonator connection structure according to claim 1, characterized in that: It also includes a second pop rivet, which includes a second rivet body and a second rivet core. The second rivet body has a third fixing head and a third rod body, and the second rivet core has a fourth fixing head and a fourth rod body. The third fixing head abuts against the upper end face of the secondary platform (120), the third rod body is disposed on the connecting platform (300), and the fourth rod body is disposed on the third rod body, so that the fourth fixing head abuts against the third rod body, so that the third rod body folds outward to form a second flange abutting against the lower end face of the connecting platform (300). The third fixing head constitutes the first abutting member (400a), the fourth fixing head constitutes the second abutting member (400b), and the third rod body and the fourth rod body constitute the connecting member (400c).

9. A novel resonator connection structure according to claim 7, characterized in that: It also includes a washer (900) that abuts against the upper surface of the secondary platform (120), and the first flange (813) abuts against the washer (900).

10. A cavity filter, characterized in that: Includes the resonator connection structure as described in any one of claims 1-9.

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