CN111403865A

CN111403865A - Communication device, dielectric waveguide filter and design method for suppressing far-end harmonic thereof

Info

Publication number: CN111403865A
Application number: CN202010258247.9A
Authority: CN
Inventors: 欧阳洲; 黄友胜; 丁海
Original assignee: Comba Telecom Technology Guangzhou Ltd; Jingxin RF Technology Guangzhou Co ltd
Current assignee: Comba Telecom Technology Guangzhou Ltd; Jingxin RF Technology Guangzhou Co ltd
Priority date: 2020-04-03
Filing date: 2020-04-03
Publication date: 2020-07-10
Also published as: WO2021196798A1

Abstract

The invention relates to a communication device, a dielectric waveguide filter and a design method for inhibiting far-end harmonic waves. The dielectric block is provided with a first surface and a second surface which are opposite, the first surface is provided with a capacitive coupling hole, the capacitive coupling hole extends from the first surface to the second surface, and the first surface is also provided with a first frequency hole. The first frequency hole is positioned at one side of the capacitive coupling hole, the second surface is provided with a first blind hole, and the first blind hole is positioned at the other side of the capacitive coupling hole. The first blind hole can well inhibit far-end harmonic waves generated by capacitive coupling, so that better electrical performance can be realized, the influence of the harmonic waves generated by the capacitive coupling on a communication system is further solved, and a filter has larger design margin during design; in addition, first blind hole can also be used for adjusting the capacitive coupling volume, and when the degree of depth of first blind hole is darker, the capacitive coupling volume is bigger for it is more nimble when the wave filter design.

Description

Communication device, dielectric waveguide filter and design method for suppressing far-end harmonic thereof

Technical Field

The invention relates to the technical field of communication devices, in particular to a communication device, a dielectric waveguide filter and a design method for suppressing far-end harmonic waves.

Background

With the rapid development of communication systems entering the 5G era, the miniaturization of devices is the key for the development of communication equipment, and the miniaturization, high-performance and low-power consumption of filters is the key for the miniaturization of 5G equipment. The dielectric waveguide filter has all the characteristics of miniaturization of 5G equipment, so the dielectric waveguide filter has wide application prospect in 5G communication equipment. Therefore, the design method of the dielectric waveguide filter becomes a hot point of research. The dielectric waveguide filter improves the air filling form of the traditional waveguide filter into the filling of a high-dielectric-constant ceramic material, the ceramic dielectric material is formed by die casting to play a role in transmitting signals and supporting a structure, and the metal material is attached to the surface of the ceramic dielectric material and serves as an electric wall to play an electromagnetic shielding role.

Conventionally, a capacitive coupling mode adopted in the design of many dielectric waveguide filters generates far-end harmonics at the low end of the filter, however, the harmonics generated by the capacitive coupling mode are difficult to process in the prior art, so that the suppression effect of the filter is deteriorated, good electrical performance cannot be realized, and the performance index cannot meet the design requirement; most of the harmonics generated by the capacitive coupling mode are in the conventional communication frequency band, and stray signals can be generated in practical application to influence the performance of a communication system.

Disclosure of Invention

Accordingly, there is a need to overcome the drawbacks of the prior art and to provide a communication device, a dielectric waveguide filter and a design method for suppressing far-end harmonics thereof, which can better suppress the far-end harmonics generated by capacitive coupling.

The technical scheme is as follows: a dielectric waveguide filter, the dielectric waveguide filter comprising: the capacitive coupling device comprises a dielectric block, a first circuit board and a second circuit board, wherein the dielectric block is provided with a first surface and a second surface which are opposite to each other, the first surface is provided with a capacitive coupling hole, the second surface is provided with a port and a first blind hole, and the first blind hole is positioned on the first side of the capacitive coupling hole; and the metal layer is arranged on the outer wall surface of the dielectric block, the hole wall of the capacitive coupling hole and the hole wall of the first blind hole.

In the dielectric waveguide filter, the first blind hole and the port are arranged on the same surface and are both positioned on the second surface, the first blind hole is arranged on one resonant cavity, and the first blind hole can better inhibit far-end harmonic waves generated by capacitive coupling, so that better electrical performance can be realized, the influence of the harmonic waves generated by the capacitive coupling on a communication system is further solved, and the filter has larger design margin during design; in addition, first blind hole can also be used for adjusting the capacitive coupling volume, and when the degree of depth of first blind hole is darker, the capacitive coupling volume is bigger for it is more nimble when the wave filter design. In addition, the technical scheme of suppressing the far-end harmonic generated by capacitive coupling by arranging the first blind hole is not limited by the processing precision of the dielectric waveguide filter, and the application range is wide. The design and processing are simple, the forming is convenient, the control is easy, the consistency is good, and the mass production is convenient.

In one embodiment, the first surface is further provided with a first frequency hole, the first frequency hole is located on the first side of the capacitive coupling hole, and the metal layer is further disposed on a hole wall of the first frequency hole.

In one embodiment, the first surface is further provided with a second frequency hole, and the second frequency hole is positioned at the second side of the capacitive coupling hole.

In one embodiment, the second surface is further provided with a second blind hole, and the second blind hole is located at the second side of the capacitive coupling hole.

In one embodiment, the number of the first blind holes is two or more, and the two or more first blind holes are arranged on the second surface at intervals.

In one embodiment, the opening of the first blind hole is circular, oval, triangular, quadrilateral, pentagonal or hexagonal; or the first blind hole is a conical blind hole, a trapezoidal blind hole or a cylindrical blind hole.

In one embodiment, the capacitive coupling hole is a through hole extending from the first surface to the second surface, the metal layer on the second surface is provided with an annular hollow area, the annular hollow area is circumferentially arranged around the capacitive coupling hole, and the inner ring diameter of the annular hollow area is larger than the aperture of the capacitive coupling hole.

In one embodiment, the capacitive coupling hole is a blind hole.

In one embodiment, the dielectric block is a ceramic dielectric block; the metal layer is a metal silver layer, a metal copper layer, a metal platinum layer or a metal gold layer which is plated, sprayed or adhered on the dielectric block.

In one embodiment, the first surface is further provided with a plurality of third frequency holes, and the second surface is further provided with a signal input port and a signal output port.

A communication device comprises the dielectric waveguide filter.

In the communication device, the first blind hole and the port are arranged on the same surface and are both positioned on the second surface, the first blind hole is arranged on one resonant cavity, and the first blind hole can better inhibit far-end harmonic waves generated by capacitive coupling, so that better electrical performance can be realized, the influence of the harmonic waves generated by the capacitive coupling on a communication system is further solved, and a filter has larger design margin during design; in addition, first blind hole can also be used for adjusting the capacitive coupling volume, and when the degree of depth of first blind hole is darker, the capacitive coupling volume is bigger for it is more nimble when the wave filter design. In addition, the technical scheme of suppressing the far-end harmonic generated by capacitive coupling by arranging the first blind hole is not limited by the processing precision of the dielectric waveguide filter, and the application range is wide. The design and processing are simple, the forming is convenient, the control is easy, the consistency is good, and the mass production is convenient.

A design method for suppressing far-end harmonics of a dielectric waveguide filter comprises the following steps: when the suppression effect of far-end harmonics needs to be improved, the depth of the first blind holes is increased, and/or more than two first blind holes which are spaced from each other are arranged on the second surface, so that the number of the first blind holes on the second surface is increased.

According to the design method for inhibiting the far-end harmonic waves of the dielectric waveguide filter, the first blind hole can inhibit the far-end harmonic waves generated by capacitive coupling well, so that better electrical performance can be realized, the influence of the harmonic waves generated by the capacitive coupling on a communication system is further solved, and the filter has larger design allowance during design; in addition, first blind hole can also be used for adjusting the capacitive coupling volume, and when the degree of depth of first blind hole is darker, the capacitive coupling volume is bigger for it is more nimble when the wave filter design. In addition, the technical scheme of suppressing the far-end harmonic generated by capacitive coupling by arranging the first blind hole is not limited by the processing precision of the dielectric waveguide filter, and the application range is wide. The design and processing are simple, the forming is convenient, the control is easy, the consistency is good, and the mass production is convenient.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention.

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a first surface of a dielectric waveguide filter according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a second surface of a dielectric waveguide filter according to an embodiment of the present invention;

FIG. 3 is a cross-sectional view at A-A of FIG. 1;

fig. 4 is a schematic structural view of a first surface of a dielectric waveguide filter according to another embodiment of the present invention;

FIG. 5 is a cross-sectional view at B-B of FIG. 4;

fig. 6 is a schematic structural view of a second surface of a dielectric waveguide filter according to still another embodiment of the present invention;

FIG. 7 is a cross-sectional view at C-C of FIG. 6;

fig. 8 is a schematic structural view of a second surface of a dielectric waveguide filter in a further embodiment of the present invention;

FIG. 9 is a cross-sectional view taken at D-D of FIG. 8;

FIG. 10 is a graph showing the response of a dielectric waveguide filter according to a conventional embodiment;

fig. 11 is a response curve diagram of a dielectric waveguide filter according to an embodiment of the invention.

10. A dielectric block; 11. a capacitive coupling aperture; 12. a first frequency aperture; 13. a first blind hole; 14. a second frequency aperture; 15. a second blind hole; 16. a third frequency aperture; 17. a signal input port; 18. a signal output port; 19. inductively coupled blind vias; 20. a metal layer; 21. annular fretwork district.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

Referring to fig. 1 to 3, fig. 1 shows a schematic view of a first surface of a dielectric waveguide filter in an embodiment of the present invention, fig. 2 shows a schematic view of a second surface of a dielectric waveguide filter in an embodiment of the present invention, and fig. 3 shows a schematic view of the first surface of the dielectric waveguide filter at a-a in an embodiment of the present invention. An embodiment of the present invention provides a dielectric waveguide filter, including: a dielectric block 10 and a metal layer 20. The dielectric block 10 is provided with a first surface and a second surface which are opposite. The first surface is provided with a capacitive coupling hole 11, and the second surface is provided with a port and a first blind hole 13. The first blind hole 13 is located on a first side of the capacitive coupling hole 11. The metal layer 20 is disposed on the outer wall surface of the dielectric block 10, the hole wall of the capacitive coupling hole 11, and the hole wall of the first blind hole 13. Specifically, in the present embodiment, the ports are a signal input port 17 and a signal output port 18.

In the dielectric waveguide filter, the first blind hole 13 and the port are arranged on the same surface and are both positioned on the second surface, the first blind hole 13 is arranged on one resonant cavity, and the first blind hole 13 can better inhibit far-end harmonic waves generated by capacitive coupling, so that better electrical performance can be realized, the influence of the harmonic waves generated by the capacitive coupling on a communication system is further solved, and the filter has larger design margin during design; in addition, first blind hole 13 can also be used for adjusting the capacitive coupling volume, and when the degree of depth of first blind hole 13 is darker, the capacitive coupling volume is bigger for it is more nimble when the filter is designed. In addition, the technical scheme of suppressing the far-end harmonic generated by the capacitive coupling by arranging the first blind hole 13 is not limited by the processing precision of the dielectric waveguide filter, and the application range is wide. The design and processing are simple, the forming is convenient, the control is easy, the consistency is good, and the mass production is convenient.

Referring to fig. 4 and 5, fig. 4 is a schematic structural view of the second surface of the dielectric waveguide filter in another embodiment of the present invention, and fig. 5 is a cross-sectional view of fig. 4 at B-B. In some embodiments, the first surface is further provided with a first frequency hole 12, the first frequency hole 12 is located on a first side of the capacitive coupling hole 11, and the metal layer 20 is further provided on a hole wall of the first frequency hole 12. Furthermore, a second frequency hole 14 is provided on the first surface, the second frequency hole 14 being located at a second side of the capacitive coupling hole 11.

It should be noted that the first frequency hole 12 is a blind hole extending from the first surface to the inside of the dielectric block 10, and is a resonant cavity located in one side region of the capacitive coupling hole 11 for adjusting the frequency of the resonant cavity located at the side; the second frequency holes 14 are also blind holes having a first surface extending toward the inside of the dielectric block 10.

It should be noted that the first side region of the capacitive coupling hole 11 is one of the resonant cavities, that is, the first frequency hole 12 is disposed on one of the resonant cavities for adjusting the frequency of one of the resonant cavities; the second side region of the capacitive coupling hole 11 is another resonant cavity, that is, the second frequency hole 14 is disposed on the other resonant cavity, and is used for adjusting the frequency of the other resonant cavity;

as an example, as the depth of the first blind hole 13 is deeper, the depth of the first frequency hole 12 is correspondingly shallower. When the depth of the first blind hole 13 is deeper, far-end harmonic waves generated by capacitive coupling can be well inhibited, so that better electrical performance can be realized; further, the deeper the depth of the first blind via 13 is, the larger the capacitive coupling amount is, and the frequency adjustment function is performed.

Referring to fig. 1 to 3, when the depth of the first blind hole 13 reaches a certain value, the first frequency hole 12 may not need to be designed, because the first blind hole 13 can already perform the frequency adjustment function.

Referring to fig. 6 and 7, fig. 6 is a schematic structural diagram of a second surface of a dielectric waveguide filter according to another embodiment of the present invention; fig. 7 is a cross-sectional view at C-C of fig. 6. In one embodiment, a second blind hole 15 is further disposed on the second surface, and the second blind hole 15 is located on a second side of the capacitive coupling hole 11. Like the first blind hole 13, the second blind hole 15 is located on the resonant cavity on the second side of the capacitive coupling hole 11, and the second blind hole 15 can also better suppress the far-end harmonic generated by capacitive coupling, so that better electrical performance can be realized; on the other hand, the deeper the second blind hole 15, the greater the capacitive coupling amount, and the frequency adjustment function is performed. The relationship between the second blind via 15 and the second frequency via 14 is similar to the relationship between the first blind via 13 and the first frequency via 12, and will not be described again.

Referring to fig. 8 and 9, fig. 8 is a schematic structural diagram of a second surface of a dielectric waveguide filter according to still another embodiment of the present invention; fig. 9 is a cross-sectional view at D-D of fig. 8. In one embodiment, the number of the first blind holes 13 is two or more, and the two or more first blind holes 13 are disposed on the second surface at intervals. As such, when the number of first blind holes 13 is larger, the depth of the first frequency hole 12 can be made correspondingly shallower. The number of the first blind holes 13 is set according to practical conditions and is not limited. In addition, the larger the number of the first blind holes 13, the larger the capacitive coupling amount, and the frequency adjustment function is performed. Secondly, when the quantity of first blind hole 13 is more, the degree of depth that the degree of depth of first blind hole 13 need not to set up is too dark, and what can do is a little shallow to can be convenient for carry out the die sinking preparation, can improve production efficiency.

In one embodiment, the opening of the first blind hole 13 is circular, oval, triangular, quadrilateral, pentagonal or hexagonal; or, the first blind hole 13 is a tapered blind hole, a trapezoidal blind hole or a cylindrical blind hole. It will be appreciated that, similarly to the shape of the first blind hole 13, the opening of the second blind hole 15 is circular, oval, triangular, quadrangular, pentagonal or hexagonal in shape; or, the second blind hole 15 is a tapered blind hole, a trapezoidal blind hole, or a cylindrical blind hole. It should be noted that, in this embodiment, the shape of the first blind hole 13 is not limited, and the number of the first blind holes 13 is also not limited, and is set correspondingly according to actual requirements. Similarly, the shape of the second blind holes 15 is not limited, and the number of the second blind holes 15 is also not limited, and the second blind holes are correspondingly arranged according to actual requirements.

In an embodiment, referring to fig. 2, fig. 6 and fig. 8 again, the capacitive coupling hole 11 is a through hole extending from the first surface to the second surface, the metal layer 20 on the second surface is provided with an annular hollow area 21, the annular hollow area 21 is circumferentially disposed around the capacitive coupling hole 11, and an inner ring diameter of the annular hollow area 21 is larger than an aperture of the capacitive coupling hole 11. Note that the annular hollow-out area 21 is free of the metal layer 20. In this way, the metal layer 20 on the hole wall of the capacitive coupling hole 11 and the metal layer 20 at the hole edge of the capacitive coupling hole 11 are still connected to each other, and the metal layer 20 at the hole edge of the capacitive coupling hole 11 is separated from the metal layer 20 in the remaining area on the second surface by the annular hollow area 21. By arranging the annular hollow-out area 21, the capacitive coupling amount can be correspondingly adjusted when the width of the annular hollow-out area 21 is adjusted. In addition, the shape of the annular hollow-out area 21 is not limited, and may be a circular ring shape, an elliptical ring shape, or other irregular shapes, which is not limited herein.

Note that the annular hollow-out area 21 is not covered with the metal layer 20 and exposes the wall surface of the dielectric block 10. Specifically, the metal layer 20 at the annular hollow area 21 is removed to expose the wall surface. Of course, the wall surface of the dielectric block 10 corresponding to the annular hollow-out area 21 may not be plated or sprayed with the metal layer 20, so as to expose the wall surface of the dielectric block 10.

In another embodiment, the capacitive coupling hole 11 is a blind hole, and it is not necessary to provide a ring-shaped hollow-out area on the metal layer 20 on the second surface.

In one embodiment, the dielectric block 10 is a ceramic dielectric block 10; the metal layer 20 is a metal silver layer, a metal copper layer, a metal platinum layer or a metal gold layer plated, sprayed or adhered on the dielectric block 10.

In one embodiment, referring to fig. 1 and 4, a plurality of third frequency holes 16 are further disposed on the first surface. The dielectric waveguide filter illustrated in fig. 1 and 4 is a six-cavity dielectric waveguide filter, the six-cavity dielectric waveguide filter is provided with a first frequency hole 12 and a capacitive coupling hole 11, the dielectric waveguide filter illustrated in fig. 1 is further provided with four third frequency holes 16, and the dielectric waveguide filter illustrated in fig. 4 is further provided with, for example, four third frequency holes 16 and one second frequency hole 14. In addition, a signal input port 17 and a signal output port 18 are provided on the second surface. Signal transmission with an external device can be realized through the signal input port 17 and the signal output port 18.

Further, the dielectric waveguide filter illustrated in fig. 1 and 4 is further provided with an inductive coupling blind hole 19, for example. The blind inductive coupling hole 19 is used to enhance the magnitude of the inductive coupling between two adjacent resonant cavities. The depth, aperture and other parameters of the blind inductive coupling hole 19 can be adjusted, and when the depth, aperture and other parameters of the blind inductive coupling hole 19 are adjusted, the inductive coupling amount between two adjacent resonant cavities is correspondingly adjusted. When the depth of the blind inductive coupling hole 19 is specifically 0, it is equivalent to that the blind inductive coupling hole 19 is not required to be provided.

Referring to fig. 10 and 11 again, fig. 10 is a graph illustrating a response curve of a dielectric waveguide filter according to a conventional embodiment; fig. 11 is a graph illustrating a response curve of a dielectric waveguide filter according to an embodiment of the present invention. For the conventional six-cavity dielectric waveguide filter, the harmonic generated by the capacitive coupling is-57.9 dB, as can be seen from fig. 10. Compared with the conventional dielectric waveguide filter with the six-cavity structure, the improved dielectric waveguide filter with the six-cavity structure has the advantages that the first blind hole 13 is added in the structure, so that the harmonic generated by capacitive coupling can be-73.2 dB, and the suppression effect on the far-end harmonic is obviously improved as can be seen from FIG. 11. Thus, the dielectric waveguide filter of the present embodiment has significantly improved harmonics generated by capacitive coupling compared to the conventional dielectric waveguide filter.

In one embodiment, a communication device comprises a dielectric waveguide filter as described in any of the above embodiments. The communication device may be a 3G product, a 4G product, or a 5G product, and is not limited herein. The communication device may be a dielectric waveguide filter monolithic structure, a duplexer, or a multiplexer, and is not limited herein.

In the communication device, the first blind hole 13 and the port are arranged on the same surface and are both positioned on the second surface, the first blind hole 13 is arranged on one resonant cavity, and the first blind hole 13 can better inhibit far-end harmonic waves generated by capacitive coupling, so that better electrical performance can be realized, the influence of the harmonic waves generated by the capacitive coupling on a communication system is further solved, and a filter has larger design margin during design; in addition, first blind hole 13 can also be used for adjusting the capacitive coupling volume, and when the degree of depth of first blind hole 13 is darker, the capacitive coupling volume is bigger for it is more nimble when the filter is designed. In addition, the technical scheme of suppressing the far-end harmonic generated by the capacitive coupling by arranging the first blind hole 13 is not limited by the processing precision of the dielectric waveguide filter, and the application range is wide. The design and processing are simple, the forming is convenient, the control is easy, the consistency is good, and the mass production is convenient.

In one embodiment, a method for designing a dielectric waveguide filter to suppress far-end harmonics according to any of the above embodiments includes the following steps:

when the suppression effect of the far-end harmonic needs to be improved, the depth of the first blind hole 13 is increased, and/or more than two first blind holes 13 spaced from each other are formed in the second surface, so that the number of the first blind holes 13 in the second surface is increased.

According to the design method for inhibiting the far-end harmonic waves of the dielectric waveguide filter, the first blind hole 13 can inhibit the far-end harmonic waves generated by capacitive coupling well, so that better electrical performance can be realized, the influence of the harmonic waves generated by the capacitive coupling on a communication system is further solved, and the filter has larger design allowance during design; in addition, first blind hole 13 can also be used for adjusting the capacitive coupling volume, and when the degree of depth of first blind hole 13 is darker, the capacitive coupling volume is bigger for it is more nimble when the filter is designed. In addition, the technical scheme of suppressing the far-end harmonic generated by the capacitive coupling by arranging the first blind hole 13 is not limited by the processing precision of the dielectric waveguide filter, and the application range is wide. The design and processing are simple, the forming is convenient, the control is easy, the consistency is good, and the mass production is convenient.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A dielectric waveguide filter, comprising:

the capacitive coupling device comprises a dielectric block, a first circuit board and a second circuit board, wherein the dielectric block is provided with a first surface and a second surface which are opposite to each other, the first surface is provided with a capacitive coupling hole, the second surface is provided with a port and a first blind hole, and the first blind hole is positioned on the first side of the capacitive coupling hole; and

and the metal layer is arranged on the outer wall surface of the dielectric block, the hole wall of the capacitive coupling hole and the hole wall of the first blind hole.

2. A dielectric waveguide filter according to claim 1, wherein the first surface is further provided with a first frequency hole, the first frequency hole being located at a first side of the capacitive coupling hole, and wherein the metal layer is further provided on a wall of the first frequency hole.

3. A dielectric waveguide filter according to claim 1, wherein the first surface is further provided with a second frequency aperture, the second frequency aperture being located on a second side of the capacitive coupling aperture.

4. A dielectric waveguide filter according to claim 1, wherein the second surface is further provided with a second blind hole, the second blind hole being located on a second side of the capacitive coupling hole.

5. The dielectric waveguide filter of claim 1, wherein the number of the first blind holes is two or more, and the two or more first blind holes are disposed on the second surface at intervals.

6. The dielectric waveguide filter according to claim 1, wherein the opening of the first blind hole has a circular, elliptical, triangular, quadrangular, pentagonal, or hexagonal shape; or the first blind hole is a conical blind hole, a trapezoidal blind hole or a cylindrical blind hole.

7. The dielectric waveguide filter of claim 1, wherein the capacitive coupling hole is a through hole extending from the first surface to the second surface, the metal layer on the second surface is provided with an annular hollow area, the annular hollow area is circumferentially disposed around the capacitive coupling hole, and an inner ring diameter of the annular hollow area is larger than an aperture of the capacitive coupling hole.

8. A dielectric waveguide filter according to claim 1, wherein the capacitive coupling holes are blind holes.

9. The dielectric waveguide filter of claim 1 wherein the dielectric blocks are ceramic dielectric blocks; the metal layer is a metal silver layer, a metal copper layer, a metal platinum layer or a metal gold layer which is plated, sprayed or adhered on the dielectric block.

10. A dielectric waveguide filter according to any one of claims 1 to 9 wherein the first surface is further provided with a plurality of third frequency holes and the second surface is further provided with a signal input port and a signal output port.

11. A communication apparatus comprising a dielectric waveguide filter according to any one of claims 1 to 10.

12. A method of designing a dielectric waveguide filter for suppressing far end harmonics according to any one of claims 1 to 10, comprising the steps of:

when the suppression effect of far-end harmonics needs to be improved, the depth of the first blind holes is increased, and/or more than two first blind holes which are spaced from each other are arranged on the second surface, so that the number of the first blind holes on the second surface is increased.