Resonator connection structure and cavity filter

Abstract

The invention discloses a resonator connecting structure and a cavity filter, the resonator connecting structure comprises a resonator and a cavity or a cover plate, the resonator is provided with a primary platform close to the cavity or the cover plate and a secondary platform far away from the cavity, the cavity or the cover plate is provided with a riveting platform, and the resonator connecting structure further comprises a rivet, the first-stage platform is riveted on the riveting platform through rivets; the rigid fixation between the resonator and the cavity or the cover plate is realized by using the rivet, the stress concentration and the screw loose risk of the slender screw are avoided, the anti-vibration capability is obviously improved, the resonator is suitable for a miniaturized coaxial cavity filter, particularly, the resonator is arranged to be in a shape of a slender structure at the bottom, the consistency of the height of the resonator is not influenced, and the service life of the resonator is prolonged. And use requirements are met.

Description

Technical Field

[0001] This invention relates to the field of filters, and in particular to a resonator connection structure and a 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 structure typically consists of a cavity 20, a resonator 10, a cover plate 30, a tuning assembly, and input / output connectors; see reference. Figure 1 In 5G scenarios, due to frequency and temperature drift compensation requirements, the resonator 10 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 70 and place the screw head on the secondary platform of the resonator 10. However, this installation method of the resonator 10 introduces reliability risks. 1. Due to the small diameter and poor strength of the screw 70, the slender shaft cannot withstand a large torque, which further leads to stripping and stress loosening risks; 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 70 will cause the resonator 10 to be compressed in the height direction, resulting in a lack of height uniformity of the resonator 10 throughout the filter. 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 70 connection; Therefore, there is an urgent need for a resonator connection structure and cavity filter to solve the above problems. Summary of the Invention

[0004] 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 resonator connection structure and a cavity filter.

[0005] One embodiment of the present invention provides a technical solution to solve its technical problem: a 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. The cavity or cover plate is provided with a riveting platform and also includes rivets. The primary platform is riveted to the riveting platform by the rivets.

[0006] As one of the preferred embodiments of the present invention, the lower end of the resonator is provided with an inwardly folded first flange to form a primary platform.

[0007] As one of the preferred embodiments of the present invention, 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 communicates with 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 the upper part of the resonant platform is constructed as a riveting platform. One end of the rivet abuts against the lower end face of the riveting platform and the other end abuts against the upper end face of the first-level platform.

[0008] As one of the preferred embodiments of the present invention, a first annular groove is provided on the side of the primary platform near the riveting platform.

[0009] As one of the preferred embodiments of the present invention, the rivet is configured as a first press rivet, which includes a first fixing head, a first press head, and a first rod body connected between the first fixing head and the first press head. A second annular groove is provided on the side of the first fixing head near the first rod body.

[0010] As one of the preferred embodiments of the present invention, the first press rivet is configured as a semi-circular head rivet, a flat head rivet, a semi-hollow semi-circular head rivet, or a semi-hollow flat head rivet.

[0011] In one preferred embodiment of the present invention, the rivet is configured as a second press rivet, which includes a second fixing head, a second press rivet head, and a second rod body connected between the second fixing head and the second press rivet head. A first sleeve extends downward from the primary platform and passes through the riveting platform. The lower end of the first sleeve is provided with a second flange that folds outward. The primary platform constitutes the second fixing head, the first sleeve constitutes the second rod body, and the second flange constitutes the second press rivet head.

[0012] In one preferred embodiment of the present invention, the rivet is configured as a third press rivet, which includes a third fixing head, a third press rivet head, and a third rod body connected between the third fixing head and the third press rivet head. The riveting platform extends upward and has a second sleeve passing through the first-level platform. The upper end of the second sleeve is provided with an outwardly folded third flange. The riveting platform constitutes the third fixing head, the second sleeve constitutes the third rod body, and the third flange constitutes the third press rivet head.

[0013] As one of the preferred embodiments of the present invention, the rivet is configured as a blind rivet, which includes a rivet body and a rivet core. The rivet body has a fourth fixing head and a fourth rod body, and the rivet core has a fifth fixing head and a fifth rod body. The fourth fixing head abuts against the lower end face of the riveting platform, the fourth rod body is disposed on the first-level platform, and the fifth rod body is disposed on the fourth rod body, so that the fifth fixing head abuts against the fourth rod body, so that the fourth rod body folds outward to form a fourth flange abutting against the first-level platform.

[0014] A cavity filter includes the aforementioned resonator connection structure.

[0015] The beneficial effects of this invention are as follows: A 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 riveting platform is provided on the cavity or cover plate, and rivets are also included. The primary platform is riveted to the riveting platform by the rivets. By using rivets to achieve rigid fixation between the resonator and the cavity or cover plate, stress concentration and stripping risk of slender screws are avoided, significantly improving vibration resistance. It is suitable for miniaturized coaxial cavity filters, especially when the resonator is set as a slender structure at the bottom, and it does not affect the consistency of the resonator height, thus meeting the usage requirements. Attached Figure Description

[0016] The above and / or additional aspects and advantages of the present invention 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 the existing resonator connection structure; Figure 2 A schematic diagram of the first structure of a resonator connection structure; Figure 3 This is a structural diagram of a rivet; Figure 4 This is a schematic diagram of a second structure for a resonator connection structure; Figure 5 This is a schematic diagram of a third structure for a resonator connection structure; Figure 6 This is a schematic diagram of a fourth structure for a resonator connection structure; Figure 7 This is a schematic diagram of the fifth structure of a resonator connection structure. Detailed Implementation

[0017] This section will describe in detail specific embodiments of the present invention. Preferred embodiments of the present invention 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 overall technical solution of the present invention, but they should not be construed as limiting the scope of protection of the present invention.

[0018] In the description of this invention, "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 indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0019] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention 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 limiting this invention.

[0020] In this invention, 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 integrally formed connection; 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 invention in conjunction with the specific content of the technical solution.

[0021] Reference Figures 2-7 The present invention provides a resonator connection structure, including a resonator 10 and a cavity 20 or a cover plate 30. The resonator 10 has a primary platform 11 near the cavity 20 or the cover plate 30 and a secondary platform 12 away from the cavity 20. A riveting platform 50 is provided on the cavity 20 or the cover plate 30, and a rivet 60 is also included. The primary platform 11 is riveted to the riveting platform 50 by the rivet 60.

[0022] ①Reference Figures 2-4 In the first embodiment of the present invention, a resonant platform 40 is provided on the cavity 20. The upper part of the resonant platform 40 is provided with a first through groove 51 and the lower part is provided with a second through groove 52. The second through groove 52 communicates with the outside of the cavity 20. The groove diameter of the first through groove 51 is smaller than the groove diameter of the second through groove 52, so that the upper part of the resonant platform 40 forms a riveting platform 50. One end of the rivet 60 abuts against the lower end surface of the riveting platform 50 and the other end abuts against the upper end surface of the primary platform 11. Preferably, the lower end of the resonator 10 is provided with an inwardly folded first flange 10a to form the primary platform 11.

[0023] Specifically, during assembly, the resonator 10 is placed on the resonator platform 40, so that the primary platform 11 of the resonator 10 abuts against the riveting platform 50. A special jig is used for fixing, and the rivet 60 is passed through the primary platform 11 and the first through slot 51 from top to bottom. Then, the primary platform 11 and the riveting platform 50 are riveted together by the rivet 60 using riveting equipment. Of course, the rivet 60 can also pass through the second through slot 52, the first through slot 51 and the primary platform 11 from bottom to top, and then the primary platform 11 and the riveting platform 50 are riveted together by the rivet 60 using riveting equipment. The permanent connection is achieved by the deformation of the rivet 60, which has a strong clamping force and can effectively resist vibration and impact loads. After the rivet 60 is connected, the firmness can be quickly judged by visual inspection or simple non-destructive testing, reducing potential quality problems. At the same time, the deformation during the riveting process is mainly concentrated on the rivet 60 itself, and the strength, toughness and other properties of the connected materials are basically unaffected.

[0024] Reference Figure 4 In some embodiments, a first annular groove 11a is provided on the side of the primary platform 11 near the riveting platform 50. This arrangement enables the contact surface between the resonator 10 and the riveting platform 50 to change from a surface to an annular shape. After riveting, the resonator 10 generates a certain reverse tension to achieve the purpose of preventing loosening.

[0025] Reference Figures 2-3 In some embodiments, the rivet 60 is configured as a first press rivet 60a, which includes a first fixing head 61a, a first press rivet head 62a, and a first rod body 63a connected between the first fixing head 61a and the first press rivet head 62a. A second annular groove 64a is provided on the side of the first fixing head 61a near the first rod body 63a. This configuration allows downward pressure to be applied to the first fixing head 61a during press riveting, causing a slight elastic deformation in the shape of the first fixing head 61a. After press riveting, the first press rivet head 62a generates a certain reverse tension, achieving the purpose of preventing loosening. (Refer to...) Figure 3 The preferred first press rivet 60a is configured as a semi-circular head rivet, a flat head rivet, a semi-hollow semi-circular head rivet, or a semi-hollow flat head rivet.

[0026] ②Reference Figure 5 In a second embodiment of the present invention, the rivet 60 is configured as a second press rivet 60b. The second press rivet 60b includes a second fixing head 61b, a second press rivet head 62b, and a second rod body 63b connected between the second fixing head 61b and the second press rivet head 62b. The first platform 11 extends downward and has a first sleeve 11b passing through the riveting platform 50. The lower end of the first sleeve 11b is provided with a second flange 11c that is folded outward. The first platform 11 constitutes the second fixing head 61b, the first sleeve 11b constitutes the second rod body 63b, and the second flange 11c constitutes the second press rivet head 62b.

[0027] Specifically, a first sleeve 11b is integrally extruded onto a primary platform 11. The first sleeve 11b passes through a first through groove 51 and enters a second through groove 52. After the resonator 10 and the cavity 20 are fixed using a fixture, the portion of the first sleeve 11b located in the second through groove 52 is riveted using a riveting device. This causes the lower end of the first sleeve 11b to fold outward to form a second flange 11c. The second flange 11c abuts against the lower end face of the riveting platform 50. The primary platform 11 constitutes a second fixing head 61b, the first sleeve 11b constitutes a second rod body 63b, and the second flange 11c constitutes a second riveting head 62b, thus achieving the riveting fixation between the resonator 10 and the cavity 20. By setting the first sleeve 11b, the resonator 10 can be equipped with its own rivet, which not only reduces production costs but also plays a positioning role during the riveting process, thus improving the riveting effect.

[0028] ③ As a third embodiment of the present invention, the rivet 60 is configured as a third press rivet, which includes a third fixing head, a third press rivet head, and a third rod body connected between the third fixing head and the third press rivet head. The riveting platform 50 extends upward with a second sleeve that passes through the first-level platform 11. The upper end of the second sleeve is provided with an outwardly folded third flange. The riveting platform 50 constitutes the third fixing head, the second sleeve constitutes the third rod body, and the third flange constitutes the third press rivet head.

[0029] Specifically, a second sleeve is integrally extruded onto the riveting platform 50. The second sleeve passes through the second through groove 52 and the first through groove 51 and extends above the primary platform 11. After the resonator 10 and the cavity 20 are fixed using a jig, the portion of the second sleeve located above the primary platform 11 is riveted using a riveting device, causing the upper end of the second sleeve to fold outward to form a third flange. The third flange abuts against the upper end face of the primary platform 11. The riveting platform 50 constitutes the third fixing head, the second sleeve constitutes the third rod body, and the third flange constitutes the third riveting head, thus achieving the riveting fixation between the resonator 10 and the cavity 20. By setting the second sleeve, the resonator 40 (cavity 20) can be equipped with rivets, which not only reduces production costs, but also the second sleeve plays a positioning role during the riveting process, which is beneficial to improving the riveting effect.

[0030] ④Reference Figure 6In the fourth embodiment of the present invention, the rivet 60 is configured as a blind rivet 60c. The blind rivet 60c includes a rivet body 61c and a rivet core 62c. The rivet body 61c has a fourth fixing head 611c and a fourth rod body 612c. The rivet core 62c has a fifth fixing head 621c and a fifth rod body 622c. The fourth fixing head 611c abuts against the lower end face of the riveting platform 50. The fourth rod body 612c passes through the primary platform 11. The fifth rod body 622c passes through the fourth rod body 612c. The fifth fixing head 621c abuts against the fourth rod body 612c, so that the fourth rod body 612c is folded outward to form a fourth flange 613c that abuts against the primary platform 11.

[0031] Specifically, during assembly, the resonator 10 is placed on the resonator platform 40, so that the primary platform 11 of the resonator 10 abuts against the riveting platform 50. A special jig is used for fixing. The pop rivet 60c is passed from bottom to top through the second through slot 52 and the first through slot 51 and extends to the top of the primary platform 11. At this time, the fifth fixing head 621c abuts against the lower end face of the riveting platform 50. Then, the riveting equipment is used to pull the rivet core 62c, so that the fifth rod 622c drives the fifth fixing head 621c to squeeze the fourth rod 612c, causing the fourth rod 612c to fold outward to form a joint with the upper end face of the primary platform 11. The fourth flange 613c abuts to achieve the riveting fixation between the resonator 10 and the cavity 20. Of course, the core rivet 60c passes through the first-stage platform 11 and the first through slot 51 from top to bottom and enters the second through slot 52. At this time, the fifth fixing head 621c abuts with the upper end face of the first-stage platform 11. Then, the riveting equipment pulls the rivet core 62c, so that the fifth rod 622c drives the fifth fixing head 621c to squeeze the fourth rod 612c, causing the fourth rod 612c to fold outward to form the fourth flange 613c that abuts with the lower end face of the riveting platform 50, thereby achieving the riveting fixation between the resonator 10 and the cavity 20.

[0032] ⑤Reference Figure 7 As the fifth embodiment of the present invention, the difference from the fourth embodiment is that the resonator 10 is connected to the cover plate 30, and a riveting platform 50 is constructed by opening a through hole in the cover plate 30. The fifth fixing head 621c of the pop rivet 60c abuts against the outer side of the cover plate 30, and the fourth flange 613c abuts against the inner side of the first-stage platform 11, thereby realizing the riveting fixation between the resonator 10 and the cover plate 30.

[0033] The present invention also provides a cavity filter, including the aforementioned resonator connection structure.

[0034] The advantages of this invention are: by using rivets to achieve rigid fixation between the resonator and the cavity or cover plate, stress concentration and stripping risk of slender screws are avoided, vibration resistance is significantly improved, and it is suitable for miniaturized coaxial cavity filters, especially when the resonator is set with a slender bottom structure, and it does not affect the consistency of the resonator height, thus meeting the usage requirements.

[0035] Of course, the present invention 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 the present invention. All such equivalent modifications and substitutions are included within the scope defined by the claims of this application.

Claims

1. A resonator connection structure, comprising a resonator (10) and a cavity (20) or a cover plate (30), characterized in that: The resonator (10) has a primary platform (11) near the cavity (20) or cover plate (30) and a secondary platform (12) away from the cavity (20). A riveting platform (50) is provided on the cavity (20) or cover plate (30), and a rivet (60) is also provided. The primary platform (11) is riveted to the riveting platform (50) by the rivet (60).

2. The resonator connection structure according to claim 1, characterized in that: The lower end of the resonator (10) is provided with an inwardly folded first flange (10a) to form the first-stage platform (11).

3. The resonator connection structure according to claim 1, characterized in that: A resonant platform (40) is provided on the cavity (20). The upper part of the resonant platform (40) is provided with a first through groove (51) and the lower part is provided with a second through groove (52). The second through groove (52) communicates with the outside of the cavity (20). The groove diameter of the first through groove (51) is smaller than the groove diameter of the second through groove (52) so that the upper part of the resonant platform (40) forms the riveting platform (50). One end of the rivet (60) abuts against the lower end face of the riveting platform (50) and the other end abuts against the upper end face of the primary platform (11).

4. The resonator connection structure according to claim 1, characterized in that: The first-level platform (11) has a first annular groove (11a) on the side near the riveting platform (50).

5. A resonator connection structure according to claim 1, characterized in that: The rivet (60) is configured as a first press rivet (60a), which includes a first fixing head (61a), a first press rivet head (62a), and a first rod body (63a) connected between the first fixing head (61a) and the first press rivet head (62a). A second annular groove (64a) is provided on the side of the first fixing head (61a) near the first rod body (63a).

6. A resonator connection structure according to claim 5, characterized in that: The first press-fit rivet (60a) is configured as a semi-circular head rivet, a flat head rivet, a semi-hollow semi-circular head rivet, or a semi-hollow flat head rivet.

7. A resonator connection structure according to claim 1, characterized in that: The rivet (60) is configured as a second press rivet (60b), which includes a second fixing head (61b), a second press rivet head (62b), and a second rod body (63b) connected between the second fixing head (61b) and the second press rivet head (62b). The first platform (11) extends downward with a first sleeve (11b) that passes through the riveting platform (50). The lower end of the first sleeve (11b) is provided with a second flange (11c) that folds outward. The first platform (11) constitutes the second fixing head (61b), the first sleeve (11b) constitutes the second rod body (63b), and the second flange (11c) constitutes the second press rivet head (62b).

8. A resonator connection structure according to claim 1, characterized in that: The rivet (60) is configured as a third press rivet, which includes a third fixing head, a third press rivet head, and a third rod body connected between the third fixing head and the third press rivet head. The riveting platform (50) extends upward with a second sleeve that passes through the first-level platform (11). The upper end of the second sleeve is provided with an outwardly folded third flange. The riveting platform (50) constitutes the third fixing head, the second sleeve constitutes the third rod body, and the third flange constitutes the third press rivet head.

9. A resonator connection structure according to claim 1, characterized in that: The rivet (60) is configured as a blind rivet (60c), the blind rivet (60c) includes a rivet body (61c) and a rivet core (62c), the rivet body (61c) has a fourth fixing head (611c) and a fourth rod body (612c), the rivet core (62c) has a fifth fixing head (621c) and a fifth rod body (622c), the fourth fixing head (611c) abuts against the lower end face of the riveting platform (50), the fourth rod body (612c) passes through the first-level platform (11), the fifth rod body (622c) passes through the fourth rod body (612c), so that the fifth fixing head (621c) abuts against the fourth rod body (612c), so that the fourth rod body (612c) folds outward to form a fourth flange (613c) abutting against the first-level platform (11).

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

Images