CN211743353U

CN211743353U - Dielectric waveguide filter

Info

Publication number: CN211743353U
Application number: CN202020219348.0U
Authority: CN
Inventors: 韩莉; 李陆龙; 姜华; 岳月华
Original assignee: AAC Technologies Pte Ltd
Current assignee: AAC Technologies Pte Ltd
Priority date: 2020-02-27
Filing date: 2020-02-27
Publication date: 2020-10-23
Anticipated expiration: 2030-02-27
Also published as: WO2021168916A1

Abstract

The utility model discloses a dielectric waveguide filter, which comprises a dielectric body and metal sprayed on the surface of the dielectric body; the medium body is of a cylindrical structure and comprises a first surface and a second surface which are arranged oppositely, the first surface is provided with a plurality of resonance holes towards the second surface in a concave mode, the second surface is provided with an input hole and an output hole towards the first surface in a concave mode, and a coupling hole is formed between any two adjacent resonance holes. The utility model discloses simple structure, for square wave filter, the volume of the dielectric waveguide wave filter of cylindrical structure, surface area are littleer, can reduce and make materials in the production process, further reduce manufacturing cost, have competitiveness more.

Description

Dielectric waveguide filter

Technical Field

The utility model relates to the field of communication technology, especially, relate to a dielectric waveguide filter.

Background

With the continuous development of communication technology, the requirements for filters are higher and higher, and miniaturization, integration and lightweight become keywords. The traditional metal filter does not occupy advantages in size and weight, and the ceramic dielectric waveguide filter gradually replaces the metal filter to become mainstream by virtue of the advantages of high Q value, good frequency selection characteristic, good working frequency stability, small insertion loss and the like. Whereas the existing ceramic dielectric waveguide filter on the market is generally based on the CQ topology as shown in fig. 1, the external shape of the filter is a square structure as shown in fig. 2, A, B, C, D, E, F in the figure are all resonance holes, and a coupling hole is usually arranged between two adjacent resonance holes, referring to fig. 2, a coupling hole a is arranged between B and C. However, the ceramic dielectric waveguide filter with the square structure has the following defects:

(1) the square filter has a relatively large surface area, requires more materials in the production and manufacturing aspects, cannot reduce the manufacturing cost, and cannot improve the market competitiveness;

(2) when the filter of the square structure generates the zero point using the CQ topology as shown in fig. 1, the coupling between the resonance holes B and D is not controlled by the actual structure such as the coupling hole a, and thus, the square filter based on the CQ topology is not easy to debug.

SUMMERY OF THE UTILITY MODEL

In order to overcome the defects of the prior art, the utility model aims to provide a dielectric waveguide filter, which can reduce the volume, reduce the production cost, improve the competitiveness of the filter on the market and is easy to tune.

The purpose of the utility model is realized by adopting the following technical scheme:

a dielectric waveguide filter comprises a dielectric body and metal sprayed on the surface of the dielectric body; the medium body is of a cylindrical structure and comprises a first surface and a second surface which are arranged oppositely, the first surface is provided with a plurality of resonance holes towards the second surface in a concave mode, the second surface is provided with an input hole and an output hole towards the first surface in a concave mode, and a coupling hole is formed between any two adjacent resonance holes.

Further, the resonant holes are arranged in sequence in a ring shape.

Furthermore, in the annular queue formed by the arrangement of the resonant holes, a coupling hole is arranged between at least two non-adjacent resonant holes.

Further, two coupling holes are arranged between at least two adjacent resonance holes.

Furthermore, the number of the resonance holes is six, three resonance holes are sequentially arranged on one side of the medium body, and the coupling holes are arranged between every two three resonance holes; the other three resonance holes are sequentially arranged on the other side of the medium body, and the coupling holes are arranged between every two three resonance holes.

Further, the resonance hole includes a first resonance hole opposite to the input hole and a sixth resonance hole opposite to the output hole, the coupling hole between the first resonance hole and the sixth resonance hole is a through hole, and a connection line between an arbitrary point of a hole wall of the first resonance hole on the first surface and an arbitrary point of a hole wall of the sixth resonance hole on the first surface is cut off by the coupling hole.

Further, the resonance hole is a circular hole or an elliptical hole, and the coupling hole is a circular hole, an elliptical hole or a long-strip-shaped hole.

Further, the resonance hole is a blind hole, and the coupling hole is a blind hole or a through hole.

Further, the dielectric body is formed by integrally pressing a ceramic dielectric block.

Compared with the prior art, the beneficial effects of the utility model reside in that:

compared with a filter with a square cross section, the cylindrical dielectric waveguide filter has smaller volume and surface area, can reduce the material used in the manufacturing process, further reduces the production cost and is more competitive; and cylindrical dielectric waveguide filtering based on the CT topology is easy to tune.

Drawings

FIG. 1 is a schematic diagram of a topology of a square filter in the prior art;

FIG. 2 is a schematic diagram of the distribution of resonant holes and coupling holes of a square filter in the prior art;

fig. 3 is a schematic perspective view of the present invention;

fig. 4 is a schematic top view of the filter of the present invention;

fig. 5 is a schematic perspective view (with additional pins) of the filter according to another view angle of the present invention;

fig. 6 is a schematic bottom view of the filter of the present invention (with hidden pins);

fig. 7 is a schematic diagram of the topology structure of the filter of the present invention.

In the figure: 1. a first resonant blind hole; 2. a second resonant blind hole; 3. a third resonant blind hole; 4. a fourth resonant blind hole; 5. a fifth resonant blind hole; 6. a sixth resonant blind hole; 7. a seventh coupling blind hole; 8. an eighth coupling blind hole; 9. a ninth coupling blind hole; 10. a tenth coupling blind hole; 11. an eleventh coupling via; 12. a twelfth coupling via; 13. a thirteenth coupling via; 14. a strip-shaped coupling through hole; 15. an input aperture; 16. an output aperture; 100. a dielectric body; 200. a first surface; 300. a second surface; 400. and (7) a pin.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and the detailed description, and it should be noted that the embodiments or technical features described below can be arbitrarily combined to form a new embodiment without conflict.

A dielectric waveguide filter is a ceramic dielectric waveguide filter applied to a 5G communication system, and compared with a filter with a square structure on the market, the filter with a cylindrical structure can further reduce the volume, so that the material required by production and manufacturing is reduced, the manufacturing cost is reduced, and the market competitiveness is improved.

The dielectric waveguide filter comprises a dielectric body 100 with a cylindrical structure, in the embodiment, the diameter of the dielectric body 100 is 19mm, the height of the dielectric body 100 is 5.5mm, the dielectric body is integrally pressed into the cylindrical structure through a ceramic dielectric block, and the frequency of the filter is 3.4-3.5 GHz; in addition, the size of the medium block can be modified according to the filtering frequency, and the size of the medium block is not limited in the application.

The media body 100 includes a first surface 200 and a second surface 300 disposed opposite.

As shown in fig. 3 and 4, the first surface 200 is provided with a plurality of resonance holes arranged in a ring shape, the resonance holes are all recessed from the first surface 200 to the second surface 300, the resonance holes may be circular holes or elliptical holes, and in this embodiment, the resonance holes are all circular blind holes.

In this embodiment, the number of the resonant holes on the first surface 200 is six, and the resonant holes are a first resonant blind hole 1, a second resonant blind hole 2, a third resonant blind hole 3, a fourth resonant blind hole 4, a fifth resonant blind hole 5, and a sixth resonant blind hole 6, which are arranged in sequence. The six resonant holes generate zero points based on the topological structure shown in fig. 7, the first resonant blind hole 1, the second resonant blind hole 2 and the third resonant blind hole 3 are located on one side of the dielectric body 100 to form one unit in the topological structure, and the fourth resonant blind hole 4, the fifth resonant blind hole 5 and the sixth resonant blind hole 6 are located on the other side of the dielectric body 100 to form another unit in the topological structure.

As shown in fig. 5 and 6, the second surface 300 of the medium body 100 is provided with an input hole 15 and an output hole 16, and the input hole 15 and the output hole 16 are used for inputting and outputting signals; the input hole 15 and the output hole 16 are blind holes; the input holes 15 are correspondingly distributed on the back of the first resonant blind hole 1, and the output holes 16 are correspondingly distributed on the back of the sixth resonant blind hole 6. In addition, pins 400 are provided on the input hole 15 and the output hole 16 to facilitate connection with an external circuit.

As shown in fig. 3-6, the dielectric body 100 is further provided with a plurality of coupling holes distributed around the resonant hole, which may be blind holes or through holes, and may be circular, oval or elongated. Specifically, the first to third resonant blind holes 1 to 3 are sequentially arranged on one side of a strip-shaped coupling through hole 14, and the fourth to sixth resonant blind holes 4 to 6 are sequentially arranged on the other side of the strip-shaped coupling through hole 14. The connecting line between any point of the hole wall of the first resonant blind hole 1 on the first surface 200 and any point of the hole wall of the sixth resonant hole 6 on the first surface 200 is blocked by the elongated coupling through hole 14, that is, the elongated coupling through hole 14 can block the coupling between the first resonant blind hole 1 corresponding to the input hole 15 and the sixth resonant hole 6 corresponding to the output hole 16. In addition, a seventh coupling blind hole 7 is arranged between the first resonance blind hole 1 and the second resonance blind hole 2, and the coupling amount between the first resonance blind hole 1 and the second resonance blind hole 2 is mainly controlled by the depth of the seventh coupling blind hole 7; an eleventh coupling through hole 11 is formed between the second resonant blind hole 2 and the third resonant blind hole 3, and the coupling amount between the second resonant blind hole 2 and the third resonant blind hole 3 is controlled by the length of the eleventh coupling through hole 11; a ninth coupling blind hole 9 is arranged between the first resonance blind hole 1 and the third resonance blind hole 3, and the coupling amount between the first resonance blind hole 1 and the third resonance blind hole 3 is controlled by the depth of the ninth coupling blind hole 9. An eighth coupling blind hole 8 is arranged between the third resonance blind hole 3 and the fourth resonance blind hole 4, and the coupling amount between the third resonance blind hole 3 and the fourth resonance blind hole 4 is controlled by the depth of the eighth coupling blind hole 8 and the strip-shaped coupling through hole 14. A twelfth coupling through hole 12 is formed between the fourth resonant blind hole 4 and the fifth resonant blind hole 5, and the coupling amount between the fourth resonant blind hole 4 and the fifth resonant blind hole 5 is mainly controlled by the length of the twelfth coupling through hole 12; a thirteenth coupling through hole 13 is formed between the fifth resonant blind hole 5 and the sixth resonant blind hole 6, and the coupling amount between the fifth resonant blind hole 5 and the sixth resonant blind hole 6 is mainly controlled by the length of the thirteenth coupling through hole 13; and a tenth coupling blind hole 10 is arranged between the fourth resonance blind hole 4 and the sixth resonance blind hole 6, and the coupling amount between the fourth resonance blind hole 4 and the sixth resonance blind hole 6 is mainly controlled by the depth of the tenth coupling blind hole 10. Wherein the ninth coupling blind hole 9 and the tenth coupling blind hole 10 are used for tuning important structures of the zero point.

In this embodiment, be equipped with ninth coupling blind hole 9 between first resonance blind hole 1 and the third resonance blind hole 3, be equipped with tenth coupling blind hole 10 between fourth resonance blind hole 4 and the sixth resonance blind hole 6, make first resonance blind hole 1 and third resonance blind hole 3, this kind of two nonadjacent resonance holes can be respectively through actual coupling hole control in annular queue for fourth resonance blind hole 4 and sixth resonance blind hole 6, be favorable to the automatic debugging in the actual debugging, improve the wave filter precision, thereby further improve the competitiveness of wave filter on the market.

Compared with a filter with a square cross section area, the cylindrical waveguide filter provided by the embodiment has the advantages that the size is smaller and the surface area is smaller under the same frequency band, so that the powder consumption and the silver consumption are greatly reduced, the cost is reduced, and the market competitiveness of products is improved.

The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention cannot be limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are all within the protection scope of the present invention.

Claims

1. A dielectric waveguide filter is characterized by comprising a dielectric body and metal sprayed on the surface of the dielectric body; the medium body is of a cylindrical structure and comprises a first surface and a second surface which are arranged oppositely, the first surface is provided with a plurality of resonance holes towards the second surface in a concave mode, the second surface is provided with an input hole and an output hole towards the first surface in a concave mode, and a coupling hole is formed between any two adjacent resonance holes.

2. A dielectric waveguide filter according to claim 1, wherein the resonant holes are arranged in a circular order.

3. A dielectric waveguide filter according to claim 2, wherein coupling holes are provided between at least two non-adjacent resonance holes in a circular array formed by the arrangement of the resonance holes.

4. A dielectric waveguide filter according to claim 3, wherein two of the coupling holes are provided between at least two adjacent ones of the resonance holes.

5. The dielectric waveguide filter according to claim 4, wherein the number of the resonance holes is set to six, three of the resonance holes are arranged in sequence on one side of the dielectric body, and the coupling holes are provided between every two of the three resonance holes; the other three resonance holes are sequentially arranged on the other side of the medium body, and the coupling holes are arranged between every two of the three resonance holes.

6. The dielectric waveguide filter according to claim 5, wherein the resonance hole includes a first resonance hole opposed to the input hole and a sixth resonance hole opposed to the output hole, the coupling hole between the first resonance hole and the sixth resonance hole is a through hole, and a line connecting an arbitrary point of a hole wall of the first resonance hole on the first surface and an arbitrary point of a hole wall of the sixth resonance hole on the first surface is interrupted by the coupling hole.

7. A dielectric waveguide filter according to claim 6, wherein the resonance holes are circular holes or elliptical holes, and the coupling holes are circular holes, elliptical holes or elongated holes.

8. The dielectric waveguide filter according to claim 7, wherein the resonance hole is a blind hole, and the coupling hole is a blind hole or a through hole.

9. A dielectric waveguide filter according to claim 1 wherein the dielectric body is integrally pressed from a block of ceramic dielectric.