Communication device, dielectric waveguide filter and design method for suppressing remote harmonics thereof

Abstract

The present invention relates to a communication device, a dielectric waveguide filter and a design method for suppressing remote harmonics thereof. The dielectric waveguide filter comprises a dielectric block and a metal layer. The dielectric block is provided with a first surface and a second surface opposite to each other. A capacitive coupling hole is provided on the first surface. The capacitive coupling hole extends from the first surface to the second surface. A first frequency hole is also provided on the first surface. The first frequency hole is located on one side of the capacitive coupling hole. A first blind hole is provided on the second surface. The first blind hole is located on the other side of the capacitive coupling hole. The first blind hole can better suppress the remote harmonics generated by the capacitive coupling, so that better electrical performance can be achieved, thereby solving the influence of the harmonics generated by the capacitive coupling on the communication system, and the filter also has a larger design margin when being designed; in addition, the first blind hole can also be used to adjust the capacitive coupling amount. When the depth of the first blind hole is deeper, the capacitive coupling amount is larger, making the filter more flexible when being designed.

Description

Technical Field

[0001] The present invention relates to the technical field of communication devices, and in particular to a communication device, a dielectric waveguide filter and a design method for suppressing far-end harmonics thereof. Background Art

[0002] As the rapid development of communication systems enters the 5G era, the miniaturization of devices is the key to the development of communication equipment, and miniaturized, high-performance, and low-power filters are the key to the miniaturization of 5G equipment. Dielectric waveguide filters have all the characteristics of 5G equipment miniaturization at the same time, so they have broad application prospects in 5G communication equipment. Therefore, the design method of dielectric waveguide filters has become a hot topic of research. Dielectric waveguide filters improve the air filling form of traditional waveguide filters into high dielectric constant ceramic material filling. The ceramic dielectric material is die-cast to play the role of transmitting signals and structural support. The metal material is attached to the surface of the ceramic dielectric material as an electric wall to play an electromagnetic shielding role.

[0003] Traditionally, the capacitive coupling method used in the design of many dielectric waveguide filters will generate far-end harmonics at the low end of the filter. However, the harmonics generated by the capacitive coupling method are difficult to handle with existing technologies, which deteriorates the suppression effect of the filter and fails to achieve good electrical performance, resulting in performance indicators that cannot meet design requirements. Most of the harmonics generated by the capacitive coupling method are within the conventional communication frequency band, and in actual applications, stray signals will be generated that affect the performance of the communication system. Summary of the invention

[0004] Based on this, it is necessary to overcome the defects of the prior art and provide a communication device, a dielectric waveguide filter and a design method for suppressing far-end harmonics, which can better suppress the far-end harmonics generated by capacitive coupling.

[0005] The technical solution is as follows: a dielectric waveguide filter, comprising: a dielectric block, the dielectric block is provided with a first surface and a second surface 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, the first blind hole is located on a first side of the capacitive coupling hole; and a metal layer, the metal layer is provided 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.

[0006] In the above-mentioned dielectric waveguide filter, the first blind hole and the port are arranged on the same surface and are both located on the second surface. The first blind hole is arranged on one of the resonant cavities. The first blind hole can better suppress the far-end harmonics generated by capacitive coupling, so that better electrical performance can be achieved, thereby solving the impact of the harmonics generated by capacitive coupling on the communication system, and the filter also has a larger design margin when designing; in addition, the first blind hole can also be used to adjust the amount of capacitive coupling. When the depth of the first blind hole is deeper, the amount of capacitive coupling is greater, making the filter more flexible when designing. In addition, the technical solution of suppressing the far-end harmonics generated by capacitive coupling by setting the first blind hole is not limited by the processing accuracy of the dielectric waveguide filter and has a wide range of applications. The design is simple to process, convenient to form, easy to control, has good consistency, and is convenient for mass production.

[0007] In one of the embodiments, a first frequency hole is further provided on the first surface, the first frequency hole is located on a first side of the capacitive coupling hole, and the metal layer is further provided on a hole wall of the first frequency hole.

[0008] In one of the embodiments, a second frequency hole is further provided on the first surface, and the second frequency hole is located on a second side of the capacitive coupling hole.

[0009] In one of the embodiments, a second blind hole is further provided on the second surface, and the second blind hole is located on a second side of the capacitive coupling hole.

[0010] In one embodiment, there are more than two first blind holes, and the more than two first blind holes are arranged on the second surface at intervals.

[0011] In one embodiment, the opening shape of the first blind hole is circular, elliptical, triangular, quadrilateral, pentagonal or hexagonal; or, the first blind hole is a conical blind hole, a trapezoidal blind hole or a cylindrical blind hole.

[0012] In one embodiment, the capacitive coupling hole is a through hole extending from the first surface to the second surface, and the metal layer on the second surface is provided with an annular hollow area, and 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.

[0013] In one embodiment, the capacitive coupling hole is a blind hole.

[0014] 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 plated, sprayed or adhered on the dielectric block.

[0015] In one embodiment, a plurality of third frequency holes are further provided on the first surface, and a signal input port and a signal output port are further provided on the second surface.

[0016] A communication device comprises the dielectric waveguide filter.

[0017] In the above-mentioned communication device, the first blind hole and the port are arranged on the same surface and are both located on the second surface. The first blind hole is arranged on one of the resonant cavities. The first blind hole can better suppress the far-end harmonics generated by capacitive coupling, so that better electrical performance can be achieved, thereby solving the impact of the harmonics generated by capacitive coupling on the communication system, and the filter also has a larger design margin when designing; in addition, the first blind hole can also be used to adjust the amount of capacitive coupling. When the depth of the first blind hole is deeper, the amount of capacitive coupling is greater, making the filter design more flexible. In addition, the technical solution of suppressing the far-end harmonics generated by capacitive coupling by setting the first blind hole is not limited by the processing accuracy of the dielectric waveguide filter and has a wide range of applications. The design is simple to process, convenient to form, easy to control, and has good consistency, which is convenient for mass production.

[0018] A design method for suppressing far-end harmonics of a dielectric waveguide filter comprises the following steps: when it is necessary to improve the suppression effect of far-end harmonics, increasing the depth of the first blind hole, and / or, providing two or more first blind holes spaced apart from each other on the second surface to increase the number of the first blind holes on the second surface.

[0019] In the above-mentioned design method for suppressing far-end harmonics of the dielectric waveguide filter, the first blind hole can better suppress the far-end harmonics generated by capacitive coupling, so that better electrical performance can be achieved, thereby solving the impact of the harmonics generated by capacitive coupling on the communication system, and the filter also has a larger design margin when designing; in addition, the first blind hole can also be used to adjust the amount of capacitive coupling. When the depth of the first blind hole is deeper, the amount of capacitive coupling is greater, making the filter design more flexible. In addition, the technical solution of suppressing the far-end harmonics generated by capacitive coupling by setting the first blind hole is not limited by the processing accuracy of the dielectric waveguide filter and has a wide range of applications. The design is simple to process, convenient to form, easy to control, has good consistency, and is convenient for mass production. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 is a schematic structural diagram of a first surface of a dielectric waveguide filter in one embodiment of the present invention;

[0023] Figure 2 is a schematic structural diagram of a second surface of a dielectric waveguide filter in one embodiment of the present invention;

[0024] Figure 3 for Figure 1 Sectional view at AA;

[0025] Figure 4 is a schematic structural diagram of a first surface of a dielectric waveguide filter in another embodiment of the present invention;

[0026] Figure 5 for Figure 4 Cross-sectional view at BB;

[0027] Figure 6 is a schematic structural diagram of a second surface of a dielectric waveguide filter in yet another embodiment of the present invention;

[0028] Figure 7 for Figure 6 Cross-sectional view at CC;

[0029] Figure 8 is a schematic structural diagram of a second surface of a dielectric waveguide filter in yet another embodiment of the present invention;

[0030] Fig. 9 for Figure 8 Sectional view at DD;

[0031] Fig.10 is a response curve diagram of a dielectric waveguide filter according to a conventional embodiment;

[0032] Fig.11 FIG. 4 is a response curve diagram of the dielectric waveguide filter according to an embodiment of the present invention.

[0033] 10. Dielectric block; 11. Capacitive coupling hole; 12. First frequency hole; 13. First blind hole; 14. Second frequency hole; 15. Second blind hole; 16. Third frequency hole; 17. Signal input port; 18. Signal output port; 19. Inductive coupling blind hole; 20. Metal layer; 21. Annular hollow area. DETAILED DESCRIPTION

[0034] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0035] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0036] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0037] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0039] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0040] See also Figures 1 to 3 , Figure 1 FIG. 1 is a schematic diagram showing a first surface of a dielectric waveguide filter in an embodiment of the present invention, Figure 2 FIG. 4 is a schematic diagram showing a second surface of a dielectric waveguide filter in an embodiment of the present invention, Figure 3 FIG. 1 is a schematic diagram showing the first surface of a dielectric waveguide filter at AA in an embodiment of the present invention. A dielectric waveguide filter provided in an embodiment of the present invention comprises: a dielectric block 10 and a metal layer 20. The dielectric block 10 is provided with a first surface and a second surface opposite to each other. A capacitive coupling hole 11 is provided on the first surface, and a port and a first blind hole 13 are provided on the second surface. The first blind hole 13 is located on a first side of the capacitive coupling hole 11. The metal layer 20 is provided 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 this embodiment, the ports are a signal input port 17 and a signal output port 18.

[0041] In the above-mentioned dielectric waveguide filter, the first blind hole 13 and the port are arranged on the same surface and are both located on the second surface. The first blind hole 13 is arranged on one of the resonant cavities. The first blind hole 13 can better suppress the far-end harmonics generated by capacitive coupling, so that better electrical performance can be achieved, thereby solving the impact of the harmonics generated by capacitive coupling on the communication system, and the filter also has a larger design margin when designing; in addition, the first blind hole 13 can also be used to adjust the capacitive coupling amount. When the depth of the first blind hole 13 is deeper, the capacitive coupling amount is greater, making the filter design more flexible. In addition, the technical solution of suppressing the far-end harmonics generated by capacitive coupling by setting the first blind hole 13 is not limited by the processing accuracy of the dielectric waveguide filter and has a wide range of applications. The design is simple to process, convenient to form, easy to control, good in consistency, and convenient for mass production.

[0042] Combination Figure 4 and Figure 5 As shown, Figure 4 FIG. 4 is a schematic structural diagram of a second surface of a dielectric waveguide filter in another embodiment of the present invention. Figure 5 Indicated Figure 4 Cross-sectional view at BB. In some embodiments, a first frequency hole 12 is further provided on the first surface, the first frequency hole 12 is located on the first side of the capacitive coupling hole 11, and the metal layer 20 is further provided on the hole wall of the first frequency hole 12. In addition, a second frequency hole 14 is further provided on the first surface, the second frequency hole 14 is located on the second side of the capacitive coupling hole 11.

[0043] It should be noted that the first frequency hole 12 is a blind hole extending from the first surface to the interior of the dielectric block 10, and is a resonant cavity located in one side area of ​​the capacitive coupling hole 11, and is used to adjust the frequency of the resonant cavity on that side; the second frequency hole 14 is also a blind hole extending from the first surface to the interior of the dielectric block 10.

[0044] 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 arranged on one of the resonant cavities, and is used to adjust 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 arranged on another resonant cavity, and is used to adjust the frequency of another resonant cavity;

[0045] As an example, when the depth of the first blind hole 13 is deeper, the depth of the first frequency hole 12 is correspondingly shallower. The deeper the depth of the first blind hole 13 is, the better it can suppress the far-end harmonics generated by the capacitive coupling, so that better electrical performance can be achieved; in addition, the deeper the depth of the first blind hole 13 is, the greater the capacitive coupling is, and the frequency regulation is also achieved.

[0046] Please refer to Figures 1 to 3 When the depth of the first blind hole 13 reaches a certain value, the first frequency hole 12 does not need to be designed, because the first blind hole 13 can already play a role in frequency regulation.

[0047] See also Figure 6 and Figure 7 , Figure 6 A schematic structural diagram of a second surface of a dielectric waveguide filter in another embodiment of the present invention is shown; Figure 7 for Figure 6 Cross-sectional view at CC. In one embodiment, a second blind hole 15 is further provided on the second surface, and the second blind hole 15 is located on the second side of the capacitive coupling hole 11. In this way, similar to the first blind hole 13, the second blind hole 15 is located on the second side resonant cavity of the capacitive coupling hole 11, and the second blind hole 15 can also play a better role in suppressing the far-end harmonics generated by the capacitive coupling, so that better electrical performance can be achieved; on the other hand, the deeper the second blind hole 15 is, the greater the capacitive coupling amount is, and it also plays a role in frequency regulation. The relationship between the second blind hole 15 and the second frequency hole 14 is similar to the relationship between the first blind hole 13 and the first frequency hole 12, and will not be repeated.

[0048] See also Figure 8 and Fig. 9 , Figure 8 is a schematic structural diagram of a second surface of a dielectric waveguide filter in yet another embodiment of the present invention; Fig. 9 for Figure 8 Cross-sectional view at DD. In one embodiment, there are more than two first blind holes 13, and the more than two first blind holes 13 are arranged on the second surface at intervals. In this way, when the number of first blind holes 13 is greater, the depth of the first frequency hole 12 can be made shallower accordingly. The number of first blind holes 13 is set according to actual conditions and is not limited. In addition, when the number of first blind holes 13 is greater, the capacitive coupling amount is greater, and the frequency regulation function is played at the same time. Secondly, when the number of first blind holes 13 is large, the depth of the first blind holes 13 does not need to be set too deep, and can be made slightly shallower, so that it is convenient to open the mold and improve production efficiency.

[0049] In one embodiment, the opening shape of the first blind hole 13 is circular, elliptical, triangular, quadrilateral, pentagonal or hexagonal; or, the first blind hole 13 is a conical blind hole, a trapezoidal blind hole or a cylindrical blind hole. It is understandable that, similar to the shape of the first blind hole 13, the opening shape of the second blind hole 15 is circular, elliptical, triangular, quadrilateral, pentagonal or hexagonal; or, the second blind hole 15 is a conical 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 not limited, and it is set accordingly according to actual needs. Similarly, the shape of the second blind hole 15 is not limited, and the number of the second blind holes 15 is not limited, and it is set accordingly according to actual needs.

[0050] In one embodiment, please refer to Figure 2 , Figure 6 and Figure 8 , the capacitive coupling hole 11 is a through hole extending from the first surface to the second surface, and the metal layer 20 on the second surface is provided with an annular hollow area 21, and the annular hollow area 21 is arranged circumferentially around the capacitive coupling hole 11, and the inner ring diameter of the annular hollow area 21 is larger than the aperture of the capacitive coupling hole 11. It should be noted that there is no metal layer 20 at the annular hollow area 21. 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 of ​​the second surface by the annular hollow area 21. By setting the annular hollow area 21, the capacitive coupling amount can be adjusted accordingly when the width of the annular hollow area 21 is adjusted. In addition, the shape of the annular hollow area 21 is not limited, and can be a circular ring, an elliptical ring, or other irregular shapes, which are not limited here.

[0051] It should be noted that the annular hollow area 21 is not covered with the metal layer 20 and the wall surface of the dielectric block 10 is exposed. Specifically, the metal layer 20 in 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 area 21 may not be electroplated or sprayed with the metal layer 20, so as to expose the wall surface of the dielectric block 10.

[0052] In another embodiment, the capacitive coupling hole 11 is a blind hole. In this case, there is no need to provide an annular hollow area on the metal layer 20 on the second surface, which is also a feasible solution.

[0053] 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 .

[0054] In one embodiment, please refer to Figure 1 and Figure 4 , a plurality of third frequency holes 16 are also provided on the first surface. Among them, Figure 1 and Figure 4 The dielectric waveguide filter shown in the figure is a six-cavity dielectric waveguide filter. In addition to the first frequency hole 12 and the capacitive coupling hole 11, the six-cavity dielectric waveguide filter is provided with Figure 1 The dielectric waveguide filter shown in the figure is also specifically provided with four third frequency holes 16, Figure 4 The dielectric waveguide filter shown in the figure is also specifically provided with 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 also provided on the second surface. Signal transmission with an external device can be achieved through the signal input port 17 and the signal output port 18.

[0055] Further, Figure 1 and Figure 4 The dielectric waveguide filter illustrated in the figure is also specifically provided with an inductive coupling blind hole 19. The inductive coupling blind hole 19 is used to enhance the inductive coupling amount between the two adjacent resonant cavities. The depth, aperture and other parameters of the inductive coupling blind hole 19 can be adjusted. When the depth, aperture and other parameters of the inductive coupling blind hole 19 are adjusted, the inductive coupling amount between the two adjacent resonant cavities is adjusted accordingly. When the depth of the inductive coupling blind hole 19 is specifically 0, it is equivalent to not needing to provide the inductive coupling blind hole 19.

[0056] Please refer to Fig.10 and Fig.11 , Fig.10 A response curve diagram of a dielectric waveguide filter according to a conventional embodiment is shown; Fig.11 FIG. 1 shows a response curve of a dielectric waveguide filter according to an embodiment of the present invention. Fig.10 It can be seen from the figure that the harmonic generated by the capacitive coupling is -57.9 dB. Compared with the conventional six-cavity dielectric waveguide filter, the improved six-cavity dielectric waveguide filter has a first blind hole 13 added to the structure. Fig.11 It can be seen that the harmonics generated by capacitive coupling can be -73.2dB, and the suppression effect on far-end harmonics is significantly increased. Thus, the dielectric waveguide filter described in this embodiment has significantly improved the harmonics generated by capacitive coupling compared to the traditional dielectric waveguide filter.

[0057] In one embodiment, a communication device includes the dielectric waveguide filter described in any of the above embodiments. It should be noted that the communication device can be a 3G product, a 4G product or a 5G product, which is not limited here. In addition, the communication device can be a dielectric waveguide filter monomer structure, a duplexer or a multiplexer, which is not limited here.

[0058] In the above-mentioned communication device, the first blind hole 13 and the port are arranged on the same surface and are both located on the second surface. The first blind hole 13 is arranged on one of the resonant cavities. The first blind hole 13 can better suppress the far-end harmonics generated by capacitive coupling, so that better electrical performance can be achieved, thereby solving the influence of the harmonics generated by capacitive coupling on the communication system, and the filter also has a larger design margin when designing; in addition, the first blind hole 13 can also be used to adjust the capacitive coupling amount. When the depth of the first blind hole 13 is deeper, the capacitive coupling amount is greater, making the filter design more flexible. In addition, the technical solution of suppressing the far-end harmonics generated by capacitive coupling by setting the first blind hole 13 is not limited by the processing accuracy of the dielectric waveguide filter and has a wide range of applications. The design is simple to process, convenient to form, easy to control, good in consistency, and convenient for mass production.

[0059] In one embodiment, a design method for suppressing remote harmonics of a dielectric waveguide filter according to any of the above embodiments comprises the following steps:

[0060] When the far-end harmonic suppression effect needs to be improved, the depth of the first blind hole 13 is increased, and / or two or more first blind holes 13 spaced apart from each other are opened on the second surface to increase the number of the first blind holes 13 on the second surface.

[0061] In the above-mentioned design method for suppressing far-end harmonics of the dielectric waveguide filter, the first blind hole 13 can better suppress the far-end harmonics generated by capacitive coupling, so as to achieve better electrical performance, thereby solving the influence of the harmonics generated by capacitive coupling on the communication system, and the filter also has a larger design margin when designing; in addition, the first blind hole 13 can also be used to adjust the amount of capacitive coupling. When the depth of the first blind hole 13 is deeper, the amount of capacitive coupling is greater, making the filter design more flexible. In addition, the technical solution of suppressing the far-end harmonics generated by capacitive coupling by setting the first blind hole 13 is not limited by the processing accuracy of the dielectric waveguide filter and has a wide range of applications. The design is simple to process, convenient to form, easy to control, has good consistency, and is convenient for mass production.

[0062] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0063] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A dielectric waveguide filter, characterized in that: The dielectric waveguide filter comprises: A dielectric block, wherein the dielectric block is provided with a first surface and a second surface opposite to each other, the first surface is provided with a capacitive coupling hole and a first frequency hole, the first frequency hole is located on a first side of the capacitive coupling hole, a port and a first blind hole are provided on the second surface, the first blind hole is located on the first side of the capacitive coupling hole, and the first blind hole can be used to suppress far-end harmonics generated by capacitive coupling; and A metal layer, wherein 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. The metal layer is also arranged on the hole wall of the first frequency hole. The first side area of ​​the capacitive coupling hole is one of the resonant cavities. The first frequency hole is arranged on one of the resonant cavities for adjusting the frequency of one of the resonant cavities. There are more than two first blind holes, and the more than two first blind holes are arranged on the second surface at intervals.

2. The dielectric waveguide filter according to claim 1, characterized in that: A second frequency hole is also provided on the first surface, and the second frequency hole is located on a second side of the capacitive coupling hole.

3. The dielectric waveguide filter according to claim 1, wherein: A second blind hole is also provided on the second surface, and the second blind hole is located on the second side of the capacitive coupling hole.

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

5. The dielectric waveguide filter according to 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, which is circumferentially arranged around the capacitive coupling hole. The inner ring diameter of the annular hollow area is larger than the aperture of the capacitive coupling hole.

6. The dielectric waveguide filter according to claim 1, wherein: The capacitive coupling hole is a blind hole.

7. The dielectric waveguide filter according to claim 1, wherein: 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 plated, sprayed or adhered on the dielectric block.

8. The dielectric waveguide filter according to any one of claims 1 to 7, characterized in that: A plurality of third frequency holes are also arranged on the first surface, and a signal input port and a signal output port are also arranged on the second surface.

9. A communication device, characterized in that: Comprising the dielectric waveguide filter according to any one of claims 1 to 8.

10. A design method for suppressing remote harmonics of a dielectric waveguide filter according to any one of claims 1 to 8, characterized in that: The steps include: When the far-end harmonic suppression effect needs to be improved, the depth of the first blind hole is increased, and / or two or more first blind holes spaced apart from each other are provided on the second surface to increase the number of the first blind holes on the second surface.

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