CN115101907A

CN115101907A - Coaxial filter and communication radio frequency device

Info

Publication number: CN115101907A
Application number: CN202210901251.1A
Authority: CN
Inventors: 王烨; 葛文; 孙兴华
Original assignee: Kunshan Luxshare RF Technology Co Ltd
Current assignee: Kunshan Luxshare RF Technology Co Ltd
Priority date: 2022-07-28
Filing date: 2022-07-28
Publication date: 2022-09-23

Abstract

The invention discloses a coaxial filter and a communication radio frequency device, and belongs to the technical field of wireless communication. The communication radio frequency device comprises a coaxial filter. The coaxial filter includes a housing having a resonant cavity, a cover plate, and a resonator. The cover plate is covered on the shell corresponding to the resonant cavity, and the resonator comprises a connecting part, a body part and a plurality of elastic sheets which are sequentially connected from one end to the other end. The connecting part is connected to the bottom of the resonant cavity, the elastic pieces are evenly arranged along the circumferential direction of the body part at intervals, and the cover plate is provided with an operating hole corresponding to the resonator. The coaxial filter can reduce the volume of a product, can improve the power capacity under the same volume, and is favorable for ensuring the performance of the product.

Description

Coaxial filter and communication radio frequency device

Technical Field

The invention relates to the technical field of wireless communication, in particular to a coaxial filter and a communication radio frequency device.

Background

Filters are commonly used in wireless communication devices, and in communication systems, to selectively filter desired signal frequencies, coaxial filters are a common filter structure. The existing coaxial filter comprises a shell, a cover plate, a resonator, a screw rod and a nut, wherein the shell is provided with a resonant cavity, the cover plate covers the resonant cavity, the screw rod penetrates through the cover plate corresponding to the resonator, and the nut is in threaded connection with the screw rod. The product frequency is adjusted by adjusting the height of the screw. However, the product is limited by the height requirement of the screw rod in the manner of adjusting the screw rod, so that the product is not beneficial to miniaturization design and improvement of the power capacity of the product under the same volume, and metal chips are easy to generate in the process of adjusting the screw rod, so that the product performance is reduced.

Therefore, a coaxial filter and a communication rf device are needed to solve the above problems.

Disclosure of Invention

The invention aims to provide a coaxial filter which can reduce the volume of a product, can improve the power capacity under the same volume and is beneficial to ensuring the performance of the product.

Another object of the present invention is to provide a communication rf device, which can reduce the volume of the product by providing the coaxial filter, and is beneficial to ensuring the product performance.

In order to achieve the purpose, the invention adopts the following technical scheme:

the utility model provides a coaxial filter, includes casing, apron and resonator, the casing has the resonant cavity, the apron corresponds the resonant cavity lid is established on the casing, the resonator includes connecting portion, this body portion and a plurality of shell fragment that connect gradually by one end to the other end, connecting portion connect in the bottom of resonant cavity, a plurality of shell fragments are followed the even interval in circumference of this body portion sets up, correspond on the apron the handle aperture has been seted up to the resonator.

As an optional scheme, the cover plate is provided with an operation hole corresponding to each spring plate.

As an optional solution, the connecting portion, the body portion and the plurality of resilient pieces are integrally formed.

As an optional scheme, a disk ring extends from one end of the body portion, which is away from the connecting portion, and the body portion and the plurality of spring pieces are connected and disposed through the disk ring.

As an optional scheme, the extending direction of the elastic sheet is the same as the plate surface of the cover plate.

As an optional solution, a mounting protrusion is disposed on the bottom wall of the resonant cavity, and the connecting portion is connected to the mounting protrusion.

As an optional scheme, a plurality of resonant cavities are provided, the resonant cavities are sequentially communicated, one resonator is provided in each resonant cavity, a coupling adjusting member is provided between two resonant cavities that are communicated, and the top end of the coupling adjusting member is connected to the cover plate.

As an alternative, the coupling adjustment member is a countersunk screw fixed to the cover plate.

As an optional scheme, the elastic sheet is in a fan shape or a polygonal shape.

A communication radio frequency device comprises the coaxial filter.

The invention has the beneficial effects that:

according to the coaxial filter, the elastic sheet of the resonator in the resonant cavity can be adjusted through the operation hole, so that the elastic sheet deforms to realize frequency adjustment, a screw is not required to be arranged for adjusting the frequency, the size is reduced, and meanwhile, the power capacity can be improved under the same size; in addition, because a screw rod is not required to be arranged, metal scraps generated when the screw rod is adjusted are avoided, and the product performance is ensured.

The communication radio frequency device provided by the invention can reduce the volume of a product by arranging the coaxial filter, and is beneficial to ensuring the performance of the product.

Drawings

Fig. 1 is an exploded view of a coaxial filter provided in accordance with an embodiment of the present invention;

fig. 2 is a top view of a coaxial filter according to an embodiment of the present invention;

FIG. 3 is a cross-sectional view taken at A-A in FIG. 2;

fig. 4 is a perspective view of a resonator when the elastic piece is triangular according to an embodiment of the present invention;

fig. 5 is a top view of a resonator with a triangular spring plate according to an embodiment of the present invention;

fig. 6 is a top view of a resonator with a quadrilateral spring plate according to an embodiment of the present invention;

fig. 7 is a top view of a resonator without a disk ring according to an embodiment of the present invention.

In the figure:

1. a housing; 11. a resonant cavity; 12. an opening; 2. a cover plate; 21. an operation hole; 3. a resonator; 31. a connecting portion; 32. a body portion; 33. a spring plate; 34. a disc ring; 4. mounting a boss; 5. and coupling the adjusting piece.

Detailed Description

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.

Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "secured" are to be construed broadly and encompass, for example, both fixed and removable connections; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Unless expressly stated or limited otherwise, the recitation of a first feature "on" or "under" a second feature may include the recitation of the first feature being in direct contact with the second feature, and may also include the recitation of the first feature being in contact with the second feature, but rather being in contact with the additional feature between them. Also, the first feature "on," "above" and "over" the second feature may include the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings of fig. 1-7.

The embodiment provides a communication radio frequency device, which can be a duplexer, a combiner and the like. The specific structure of the rf device is not limited herein. The communication radio frequency device comprises a coaxial filter.

As shown in fig. 1 to 3, the coaxial filter includes a housing 1, a cover plate 2, and a resonator 3, the housing 1 having a resonator 11. In detail, the resonant cavity 11 opens at the top end of the housing 1. The cover plate 2 is covered on the shell 1 corresponding to the resonant cavity 11, and the resonator 3 comprises a connecting part 31, a body part 32 and a plurality of elastic sheets 33 which are sequentially connected from one end to the other end. In detail, the main body 32 has a cylindrical structure. The connecting portion 31 is connected to the bottom of the resonant cavity 11, the plurality of elastic pieces 33 are uniformly arranged along the circumferential direction of the body portion 32 at intervals, and the cover plate 2 is provided with an operation hole 21 corresponding to the resonator 3.

In the coaxial filter in the embodiment, the elastic sheet 33 of the resonator 3 in the resonant cavity 11 can be adjusted through the operation hole 21, so that the elastic sheet 33 deforms to realize the adjustment of frequency, a screw rod is not required to be arranged for adjustment, the volume is reduced, and the power capacity can be improved under the same volume; in addition, because a screw rod is not required to be arranged, metal scraps generated when the screw rod is adjusted are avoided, and the product performance is favorably ensured.

In detail, when the resonator 3 is adjusted, the adjustment rod made of the non-metal material is used to penetrate through the operation hole 21 and then vertically strike any elastic sheet 33, or the elastic sheet 33 is lifted upwards by using a hook made of the non-metal material, so that the elastic sheet 33 is deformed to achieve a required frequency.

Further, the elastic sheet 33 in this embodiment is a sector or a polygon. In detail, when the elastic sheet 33 is polygonal, as shown in fig. 4 to 6, the elastic sheet 33 may be triangular or quadrangular. The shape of the elastic pieces 33 and the number of the elastic pieces 33 of each resonator 3 may be set by those skilled in the art as needed, and are not limited herein.

As shown in fig. 1 and 2, the cover plate 2 is provided with an operation hole 21 corresponding to each elastic sheet 33. It can be understood that each elastic sheet 33 is correspondingly provided with one operation hole 21, so that any one elastic sheet 33 can be adjusted conveniently.

In particular, the connection portion 31, the body portion 32, and the plurality of spring pieces 33 are integrally formed for the convenience of processing the resonator 3. Preferably, in the present embodiment, the resonator 3 is formed by stretching.

Optionally, a disk ring 34 extends from an end of the body 32 away from the connecting portion 31, and the body 32 and the plurality of elastic pieces 33 are connected through the disk ring 34. The disc ring 34 can improve the connection strength of the elastic sheet 33.

Of course, in other embodiments, as shown in fig. 7, a plurality of elastic pieces 33 may also be directly connected to the body portion 32. And are not intended to be limiting herein.

Optionally, the extending direction of the elastic sheet 33 is the same as the plate surface of the cover plate 2, so that the space can be saved, and meanwhile, the elastic sheet 33 can be conveniently adjusted through the operation hole 21.

As shown in fig. 3, a mounting protrusion 4 is provided on the bottom wall of the resonant cavity 11, and the connecting portion 31 is connected to the mounting protrusion 4. In detail, under the condition that the height of the resonant cavity 11 is not changed, the height of the resonator 3 in the vertical direction can be reduced, which is beneficial to reducing the cost. In detail, the top of the mounting protrusion 4 is opened with a mounting hole, and the connection portion 31 of the resonator 3 is mounted in the mounting hole. Alternatively, the connecting portion 31 and the mounting hole may be screwed or snapped. The specific connection manner of the connection portion 31 and the mounting hole is not limited herein.

As shown in fig. 1, a plurality of resonant cavities 11 are provided, the resonant cavities 11 are sequentially communicated, a resonator 3 is provided in each resonant cavity 11, a coupling adjusting member 5 is provided between the two communicated resonant cavities 11, and the top end of the coupling adjusting member 5 is connected to the cover plate 2. The electromagnetic coupling strength between two adjacent resonant cavities 11 is adjusted by the coupling adjusting member 5. Alternatively, seven resonant cavities 11 are provided, each resonant cavity 11 has the same size, and the size of the opening 12 between two adjacent resonant cavities 11 is the same.

In the prior art, the strength of electromagnetic coupling between two adjacent resonant cavities 11 is generally adjusted by a screw rod connected with the screw rod of the cover plate 2, and the adjustment time is long. Specifically, the depth of the countersunk head screw is measured in advance according to the coupling compensation requirement, and then the countersunk head screw is fixedly fixed on the cover plate 2, so that subsequent adjustment is not needed, and the debugging time can be effectively shortened.

In this embodiment, the housing 1 may be formed by die casting, so that the resonant cavities 11 have the same size, and the openings 12 between two adjacent resonant cavities 11 are also kept the same.

The technical principle of the present invention is described above in connection with specific embodiments. The description is made for the purpose of illustrating the principles of the invention and should not be taken in any way as limiting the scope of the invention. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without inventive effort, which would fall within the scope of the present invention.

Claims

1. The utility model provides a coaxial filter, includes casing (1), apron (2) and resonator (3), casing (1) has resonant cavity (11), apron (2) correspond resonant cavity (11) lid is established on casing (1), its characterized in that, resonator (3) include connecting portion (31), this body part (32) and a plurality of shell fragment (33) that connect gradually by one end to the other end, connecting portion (31) connect in the bottom of resonant cavity (11), a plurality of shell fragment (33) are followed the even interval in circumference of this body part (32) sets up, correspond on apron (2) handle hole (21) have been seted up in resonator (3).

2. The coaxial filter according to claim 1, wherein the cover plate (2) is provided with an operation hole (21) corresponding to each spring (33).

3. The coaxial filter of claim 1, wherein the connection portion (31), the body portion (32) and the plurality of spring pieces (33) are integrally formed.

4. The coaxial filter of claim 1, wherein a disk ring (34) extends from an end of the body portion (32) away from the connecting portion (31), and the body portion (32) and the plurality of spring pieces (33) are connected and disposed through the disk ring (34).

5. The coaxial filter according to claim 1, characterized in that the extension direction of the spring (33) is in the same direction as the plate surface of the cover plate (2).

6. The coaxial filter according to claim 1, characterized in that a mounting boss (4) is provided on the bottom wall of the resonator (11), and the connecting portion (31) is connected to the mounting boss (4).

7. The coaxial filter according to claim 1, wherein a plurality of resonant cavities (11) are provided, the plurality of resonant cavities (11) are sequentially communicated, one resonator (3) is provided in each resonant cavity (11), a coupling adjusting member (5) is provided between the two resonant cavities (11) which are communicated, and the top end of the coupling adjusting member (5) is connected to the cover plate (2).

8. The coaxial filter according to claim 7, characterized in that the coupling adjustment member (5) is a countersunk screw fixed to the cover plate (2).

9. Coaxial filter according to any of claims 1-8, characterized in that the dome (33) is fan-shaped or polygonal.

10. A communication radio frequency device comprising the coaxial filter of any one of claims 1-9.