Dielectric filter and communication device

Abstract

The present application relates to a dielectric filter and a communication device. The dielectric filter comprises at least two dielectric resonators (1) connected to each other, and a hole group (2). Each dielectric resonator (1) comprises a dielectric body (11) and a resonant cavity (12), wherein, in a first direction (Z) of the dielectric filter (10), the dielectric body (11) comprises a top face (13) and a bottom face (14), and the resonant cavity (12) penetrates the top face (13) or the bottom face (14); and, in a second direction (Y) of the dielectric filter (10), the dielectric body (11) further comprises a first side face (15) and a second side face (16). The hole group (2) is arranged between two adjacent dielectric resonators (1); each hole group (2) comprises a first hole (21) and a second hole (22), wherein two ends of the first hole (21) respectively penetrate the top face (13) and the bottom face (14), the second hole (22) penetrates at least one of the first side face (15) and the second side face (16), and, in a third direction (X) of the dielectric filter (10), the projections of the first hole (21) and the second hole (22) intersect. Thus, a magnetic field between two adjacent dielectric resonators (1) is cut more thoroughly, so that the coupling strength between higher-order modes of high-order harmonics is reduced, thereby improving the far-end rejection capability of the dielectric filter (10); and there is no need to provide an additional low-pass filter, thereby reducing costs and insertion loss.

Description

Dielectric filters and communication equipment

[0001] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office of China on July 17, 2023, with application number 202310876692.5 and invention name “Dielectric filter and communication equipment”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of communication technology, and in particular to a dielectric filter and communication equipment. Background Art

[0003] With the development of communication technology, the demand for reducing power consumption in communication systems has become increasingly urgent. Dielectric filters are becoming more and more widely used due to their advantages such as small size, low insertion loss, high power handling capacity, and low cost. Dielectric filters are usually formed by coupling several dielectric resonators. However, due to the coupling between multiple dielectric resonators, the magnetic field distribution area of ​​the entire dielectric filter may increase, thereby reducing the ability to suppress high-order harmonics. In other words, the far-end suppression ability of the dielectric filter is poor and cannot meet the user's usage needs. In the existing technology, high-order harmonics are generally suppressed by adding additional low-pass filters in conjunction with dielectric filters. However, adding additional low-pass filters will correspondingly increase insertion loss, thereby increasing the power consumption of the communication system, which is not conducive to the design requirements of the system to reduce power consumption.

[0004] Application Contents

[0005] The present application provides a dielectric filter and a communication device to solve the problem in the prior art that the dielectric filter has poor far-end suppression capability and needs to add an additional low-pass filter to perform far-end suppression.

[0006] A first aspect of an embodiment of the present application provides a dielectric filter, comprising at least two interconnected dielectric resonators and a hole group, wherein each dielectric resonator comprises a dielectric body and a resonant cavity. Along a first direction of the dielectric filter, the dielectric body comprises a top surface and a bottom surface, and the resonant cavity extends through the top surface or the bottom surface. Along a second direction of the dielectric filter, the dielectric body further comprises a first side surface and a second side surface. The hole group is arranged between two adjacent dielectric resonators, and each hole group comprises a first hole and a second hole. The two ends of the first hole extend through the top surface and the bottom surface, respectively, and the second hole extends through at least one of the first side surface and the second side surface. Along a third direction of the dielectric filter, the projections of the first hole and the second hole intersect.

[0007] In the present application, a hole group is disposed between two adjacent dielectric resonators. The hole group can cut the magnetic field between the two adjacent dielectric resonators, reducing the magnetic field distribution area of ​​the dielectric filter, thereby improving the ability to suppress higher harmonics, reducing the coupling strength between higher-order modes, and enhancing the far-end suppression capability of the dielectric filter. Furthermore, because the projections of the first hole and the second hole in the third direction intersect, the hole group can generate components in various directions within a plane perpendicular to the third direction, and can cut the magnetic field between the two adjacent dielectric resonators in various directions, thereby more fully cutting the magnetic field between the two adjacent dielectric resonators, further reducing the magnetic field distribution area of ​​the dielectric filter, further reducing the coupling strength between higher-order modes of higher harmonics, and further enhancing the far-end suppression capability of the dielectric filter. Compared with the existing traditional dielectric filter, which requires an additional low-pass filter to cooperate with the dielectric filter to suppress high-order harmonics, the dielectric filter in the embodiment of the present application has a strong remote suppression capability and no additional low-pass filter is required to cooperate with the dielectric filter to suppress high-order harmonics, thereby reducing manufacturing costs and reducing the insertion loss caused by adding a low-pass filter, thereby reducing the power consumption of communication equipment and meeting the user's usage needs. That is, it is conducive to the design requirement of removing the low-pass filter in the communication equipment system to reduce the insertion loss, and improves the user's usage experience.

[0008] In a possible design, an included angle between the projections of the first hole and the second hole in the third direction is a crossing angle, and there are at least two crossing angles with different angles.

[0009] In this solution, by varying the intersection angle between the first and second holes of a hole group, the resonant frequency of the hole group itself can be adjusted. This ensures that the hole group adequately cuts the magnetic field of two adjacent dielectric resonators while also reducing the impact of the hole group's own resonant frequency on the far-end suppression of the dielectric filter, thereby improving the far-end suppression capability of the dielectric filter. In particular, in a dielectric filter structure with multiple hole groups, the different intersection angles of the multiple hole groups can result in different resonant frequencies for each of the multiple hole groups. This reduces mutual excitation between the resonant frequencies of the multiple hole groups, thereby reducing the impact on the dielectric filter and effectively improving the far-end suppression capability of the dielectric filter.

[0010] In a possible design, in at least one of the hole groups, the first hole is connected to the second hole to reduce the space occupied by the hole group in the third direction, thereby facilitating the miniaturization design of the dielectric filter.

[0011] In one possible design, in at least one of the hole groups, the first hole and the second hole are staggered, thereby further reducing process requirements, facilitating the formation of the hole group, and having a higher degree of freedom. When other structures or components are present between two adjacent dielectric resonators, the hole group of this structure can more reasonably arrange the first hole and the second hole in the space between the two adjacent dielectric resonators, thereby facilitating the miniaturization design of the dielectric filter.

[0012] In one possible design, in at least one of the hole groups, there are multiple first holes, and at least one of the first holes is connected to the second hole, so as to further improve the design freedom of the hole group structure, so as to improve the spatial rationality of the hole group between two adjacent dielectric resonators, and also to further improve the design freedom and adjustment range of the hole group's own frequency, so as to reduce the influence of the hole group's own frequency on the far-end suppression of the dielectric filter.

[0013] In one possible design, in at least one of the hole groups, there are multiple second holes, and at least one of the second holes is connected to the first hole, so as to further improve the design freedom of the hole group structure, so as to improve the spatial rationality of the hole group between two adjacent dielectric resonators, and also to further improve the design freedom and adjustment range of the hole group's own frequency, so as to reduce the influence of the hole group's own frequency on the far-end suppression of the dielectric filter.

[0014] In one possible design, there are at least two adjacent dielectric resonators, one of which includes a first co-fired surface, and the other includes a second co-fired surface, the first co-fired surface and the second co-fired surface are opposite to each other, the first co-fired surface is provided with a first groove, the second co-fired surface is provided with a second groove, the second groove corresponds to the first groove, the first co-fired surface and the second co-fired surface are connected, and the first groove and the second groove surround the first hole and / or the second hole.

[0015] In this embodiment, first and second grooves corresponding to the first and / or second holes of the hole group can be pre-formed on the first and second co-fired surfaces. When two adjacent dielectric resonators are connected via the first and second co-fired surfaces, the first and second grooves are joined to enclose and form the first and / or second holes. This facilitates the formation of first and / or second holes with relatively complex structures, thereby increasing the design freedom of the dielectric filter.

[0016] In a possible design, at least two adjacent dielectric resonators are integrally formed, thereby facilitating mass production of dielectric filters and saving production costs.

[0017] In a possible design, the first hole is a straight through hole or a curved through hole to increase the design freedom of the first hole.

[0018] In a possible design, the cross-section of the first hole is one of rectangular, circular, elliptical, triangular, and T-shaped, so as to facilitate the processing and formation of the first hole.

[0019] In a possible design, the second hole is a straight hole or a curved hole to increase the design freedom of the second hole.

[0020] In a possible design, the cross-section of the second hole is one of rectangular, circular, elliptical, triangular, and T-shaped, so as to facilitate the processing and formation of the second hole.

[0021] In one possible design, the surface of at least one of the resonant cavity, the first hole, and the second hole is covered with a metallization layer, thereby reducing the leakage of harmonic energy, ensuring reliable signal transmission, and improving signal transmission efficiency.

[0022] The second aspect of the present application also provides a communication device, including the dielectric filter described in any of the above embodiments. Since the dielectric filter has the above technical effects, the communication device including the dielectric filter should also have the corresponding technical effects, which will not be described in detail here.

[0023] It should be understood that the foregoing general description and the following detailed description are merely illustrative and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] FIG1 is a schematic structural diagram of a dielectric filter provided in an embodiment of the present application in a specific embodiment;

[0025] FIG2 is a schematic structural diagram of another specific embodiment of the dielectric filter provided in an embodiment of the present application;

[0026] FIG3 is a schematic structural diagram of another specific embodiment of the dielectric filter provided in an embodiment of the present application;

[0027] FIG4 is a schematic structural diagram of another specific embodiment of the dielectric filter provided in an embodiment of the present application;

[0028] FIG5 is a schematic structural diagram of another specific embodiment of the dielectric filter provided in an embodiment of the present application;

[0029] FIG6 is a schematic structural diagram of another specific embodiment of the dielectric filter provided in an embodiment of the present application;

[0030] FIG7 is a schematic structural diagram of another specific embodiment of the dielectric filter provided in an embodiment of the present application;

[0031] FIG8 is a schematic structural diagram of another specific embodiment of the dielectric filter provided in an embodiment of the present application;

[0032] FIG9 is a schematic structural diagram of another specific embodiment of the dielectric filter provided in an embodiment of the present application;

[0033] FIG10 is a schematic structural diagram of another specific embodiment of the dielectric filter provided in an embodiment of the present application;

[0034] FIG11 is a schematic structural diagram of another specific embodiment of the dielectric filter provided in an embodiment of the present application;

[0035] FIG12 is a simulation comparison diagram of the far-end suppression curve of the dielectric filter provided in the embodiment of the present application and the far-end suppression curve of a conventional dielectric filter.

[0036] Reference numerals:

[0037] 10- dielectric filter;

[0038] 1- Dielectric resonator;

[0039] 11- medium body;

[0040] 12-resonant cavity;

[0041] 13-top surface;

[0042] 14-Bottom;

[0043] 15- first side;

[0044] 16- second side;

[0045] 2-hole group;

[0046] 21-first hole;

[0047] 22-second hole;

[0048] 3-first dielectric resonator;

[0049] 4- second dielectric resonator;

[0050] 41-first co-fired surface;

[0051] 42-first slot;

[0052] 5-third dielectric resonator;

[0053] 51- second co-fired surface;

[0054] 52-Second slot;

[0055] 6- fourth dielectric resonator;

[0056] X-third direction;

[0057] Y-second direction;

[0058] Z - first direction.

[0059] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application. DETAILED DESCRIPTION

[0060] In order to better understand the technical solution of the present application, the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0061] In the description of this application, unless otherwise specified or limited, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance; unless otherwise specified or explained, the term "plurality" refers to two or more; the terms "connected" and "fixed" should be understood in a broad sense. For example, "connected" can mean a fixed connection, a detachable connection, an integral connection, or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0062] In a specific embodiment, the present application is further described in detail below through specific embodiments and in conjunction with the accompanying drawings.

[0063] With the development of communication technology, the demand for reduced power consumption in communication systems is becoming increasingly urgent. Dielectric filters are becoming increasingly widely used due to their advantages such as small size, low insertion loss, high power handling, and low cost. Dielectric filters are typically formed by coupling multiple dielectric resonators. However, the coupling between multiple dielectric resonators can increase the magnetic field distribution area of ​​the entire dielectric filter, thereby reducing the ability to suppress high-order harmonics. In other words, the far-end suppression capability of dielectric filters is poor, which cannot meet user requirements.

[0064] In the prior art, high-order harmonics are generally suppressed by adding an additional low-pass filter in combination with a dielectric filter. However, adding an additional low-pass filter will correspondingly increase the insertion loss, thereby increasing the power consumption of the communication system, which is not conducive to the design requirement of reducing power consumption of the system.

[0065] To address the aforementioned technical issues, embodiments of the present application provide a dielectric filter that improves its remote suppression capability, eliminating the need for an additional low-pass filter to complement the dielectric filter in suppressing higher harmonics. This dielectric filter can be applied to communication equipment. Due to its strong remote suppression capability, it eliminates the need for an additional low-pass filter to suppress higher harmonics, thereby reducing insertion loss in the communication equipment system and, consequently, power consumption, thereby meeting user requirements. The communication equipment may be, but is not limited to, a duplexer, multiplexer, base station, terminal equipment, and the like. Embodiments of the present application do not impose any particular restrictions on the specific form of such communication equipment.

[0066] In order to more clearly describe the technical solutions of the embodiments of the present application, the dielectric filter and communication device provided by the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0067] Referring to Figure 1, Figure 1 is a schematic diagram of the structure of a dielectric filter provided by an embodiment of the present application in a specific embodiment. As shown in Figure 1, the dielectric filter 10 includes at least two interconnected dielectric resonators 1. The number of dielectric resonators 1 can be designed according to actual needs and is not limited here. Each dielectric resonator 1 includes a dielectric body 11 and a resonant cavity 12. Along the first direction Z of the dielectric filter 10, the dielectric body 11 includes a top surface 13 and a bottom surface 14. The resonant cavity 12 runs through the top surface 13 or the bottom surface 14. After the wireless signal enters the resonant cavity 12, the resonant cavity 12 selects the signal with a certain frequency to pass through, thereby realizing the filtering function.

[0068] As shown in FIG1 , the dielectric filter 10 of the embodiment of the present application further includes a hole group 2. Along the second direction Y of the dielectric filter 10, the dielectric body 11 further includes a first side surface 15 and a second side surface 16. The hole group 2 is disposed between two adjacent dielectric resonators 1. The hole group 2 can cut the magnetic field between the two adjacent dielectric resonators 1, thereby reducing the magnetic field distribution area of ​​the dielectric filter 10, thereby improving the suppression capability of higher harmonics, reducing the coupling strength between higher-order modes, and enhancing the far-end suppression capability of the dielectric filter 10.

[0069] Furthermore, as shown in Figures 1 and 2, Figure 2 is a schematic structural diagram of the dielectric filter provided in an embodiment of the present application in another specific embodiment. Each hole group 2 includes a first hole 21 and a second hole 22. The two ends of the first hole 21 respectively penetrate the top surface 13 and the bottom surface 14, and the second hole 22 penetrates at least one of the first side surface 15 and the second side surface 16. Along the third direction X of the dielectric filter 10, the projections of the first hole 21 and the second hole 22 intersect.

[0070] Among them, in the hole group 2 of the dielectric filter 10 shown in Figure 1, the two ends of the second hole 22 respectively penetrate the first side surface 15 and the second side surface 16, that is, the second hole 22 can be a through hole. In the hole group 2 of the dielectric filter 10 shown in Figure 2, one end of the second hole 22 penetrates the first side surface 15, and the other end does not penetrate the second side surface 16. Of course, the second hole 22 can also penetrate the second side surface 16 at one end and not penetrate the first side surface 15 at the other end, that is, the second hole 22 can also be a blind hole. The specific structure of the second hole 22 can be set according to actual needs and is not limited here.

[0071] In this embodiment, as shown in FIG1 , since the projections of the first hole 21 and the second hole 22 on the third direction X intersect, the hole group 2 can generate components in all directions within a plane perpendicular to the third direction X, and can cut the magnetic field between two adjacent dielectric resonators 1 in all directions, thereby more fully cutting the magnetic field between two adjacent dielectric resonators 1, thereby further reducing the magnetic field distribution area of ​​the dielectric filter 10, further reducing the coupling strength between the higher-order modes of the higher-order harmonics, and further improving the far-end suppression capability of the dielectric filter 10. Furthermore, compared to existing conventional dielectric filters that require an additional low-pass filter to cooperate with the suppression of higher-order harmonics, the dielectric filter 10 of the embodiment of the present application has a strong far-end suppression capability and does not require an additional low-pass filter to cooperate with the dielectric filter 10 to suppress higher-order harmonics, thereby reducing manufacturing costs and reducing the insertion loss caused by adding a low-pass filter, thereby reducing the power consumption of the communication device and meeting the user's usage needs. This is conducive to the design requirement of removing the low-pass filter to reduce insertion loss in the communication device system, thereby improving the user experience.

[0072] It should be noted that the dielectric filter 10 shown in FIG1 only shows the case where a group of hole groups 2 is provided between two adjacent dielectric resonators 1. Optionally, when the dielectric filter 10 has three or more dielectric resonators 1, a hole group 2 is provided between any two adjacent dielectric resonators 1 among the multiple dielectric resonators 1, or a hole group 2 can be provided between some of the two adjacent dielectric resonators 1. Furthermore, the number of hole groups 2 between two adjacent dielectric resonators 1 can be one group or two groups, three groups, or other multiple groups. Since the position and number of the hole groups 2 will produce different cutting effects on the magnetic field of the dielectric filter 10, the position and specific number of the hole groups 2 can be designed according to actual needs and are not limited here.

[0073] In addition, the dielectric filter 10 shown in FIG1 is only shown as a simple and intuitive rectangular parallelepiped structure. However, it should be understood that FIG1 is only a specific embodiment. The dielectric filter 10 provided in the embodiment of the present application is not limited to being a rectangular parallelepiped but can also be a polyhedron. In this case, the dielectric body 11 may have multiple first side surfaces 15 and second side surfaces 16 along the second direction Y, or may have multiple top surfaces 13 and bottom surfaces 14 along the first direction Z. In this case, one end of the first hole 21 of the hole group 2 can pass through any one of the multiple top surfaces 13, the other end of the first hole 21 can pass through any one of the multiple bottom surfaces 14, and the second hole 22 can pass through at least one of the multiple first side surfaces 15 and the multiple second side surfaces 16. As long as the projections of the first hole 21 and the second hole 22 in the third direction X intersect, no limitation is imposed here.

[0074] Further, referring to FIG. 3 to FIG. 5 , FIG. 3 to FIG. 5 are schematic structural diagrams of the dielectric filter provided in other specific embodiments of the embodiment of the present application.

[0075] As shown in Figures 1 to 5, the first hole 21 can be a straight through hole to facilitate the processing and formation of the first hole 21. The first hole 21 can be a vertical hole or an inclined hole. Of course, the first hole 21 can also be a curved through hole, for example, a through hole with multiple bends, a wavy through hole, or other irregular channels, to increase the design freedom of the first hole 21. The specific shape of the first hole 21 can be designed according to actual needs and is not limited here.

[0076] Furthermore, the cross-sectional shape of the first hole 21 can be varied, for example, a simple shape such as a circle as shown in FIG1 , a square as shown in FIG2 and FIG3 , a rectangle as shown in FIG4 , an ellipse as shown in FIG5 , etc., to facilitate the processing and formation of the first hole 21. Of course, the cross-sectional shape of the first hole 21 can also be a triangle, a T-shape, or other irregular shapes. The specific cross-sectional shape of the first hole 21 can be designed according to actual needs and is not limited here.

[0077] As shown in Figures 1 to 5, the second hole 22 can be a straight hole to facilitate the processing and formation of the second hole 22. The second hole 22 can be a vertical hole or an inclined hole. Of course, the second hole 22 can also be a curved hole, for example, a hole with multiple bends, a wavy hole, or other irregular channels, to increase the design freedom of the second hole 22. The specific shape of the second hole 22 can be designed according to actual needs and is not limited here.

[0078] Furthermore, the cross-sectional shape of the second hole 22 can also be various, for example, a circle as shown in FIG1 , a square as shown in FIG2 and FIG3 , a rectangle as shown in FIG4 , an ellipse as shown in FIG5 , and other simple shapes, so as to facilitate the processing and formation of the second hole 22. Of course, the cross-sectional shape of the second hole 22 can also be a triangle, a T-shape, or other irregular shapes. The specific cross-sectional shape of the second hole 22 can be designed according to actual needs and is not limited here.

[0079] It should be noted that the shapes and structures of the first hole 21 and the second hole 22 may be the same or different, and may be designed according to actual needs, and are not limited here.

[0080] In a specific embodiment, as shown in Figures 6 and 7, which are schematic structural diagrams of other specific embodiments of the dielectric filter provided by the embodiment of the present application, the angle between the projections of the first hole 21 and the second hole 22 on the third direction X is a cross angle α, and there are at least two different cross angles α. For example, the cross angle α between the projections of the first hole 21 and the second hole 22 on the third direction X is 30°, 60°, 90°, 120°, 150°, etc. The specific angle of the cross angle α can be designed according to actual needs and is not limited here.

[0081] In this embodiment, as shown in Figures 6 and 7, since each hole group 2 also has its own resonant frequency, this resonant frequency will also have a certain impact on the far-end suppression capability of the dielectric filter 10. If there are multiple hole groups 2 in the dielectric filter 10, and the frequencies of the multiple hole groups 2 are the same or similar, this will cause the resonant frequencies of the multiple hole groups 2 to mutually excite each other, thereby increasing the impact on the far-end suppression capability of the dielectric filter 10 and causing the far-end suppression capability of the dielectric filter 10 to be reduced. By changing the intersection angle α between the first hole 21 and the second hole 22 of the hole group 2, the resonant frequency of the hole group 2 itself can be adjusted. This ensures that the hole group 2 fully cuts the magnetic field of the two adjacent dielectric resonators 1 while reducing the impact of the resonant frequency of the hole group 2 itself on the far-end suppression degree of the dielectric filter 10, thereby improving the far-end suppression capability of the dielectric filter 10. Especially in the structure where there are multiple hole groups 2 in the dielectric filter 10, the cross angles α in the multiple hole groups 2 are different, which can make the resonant frequencies of the multiple hole groups 2 different, thereby reducing the mutual excitation between the resonant frequencies of the multiple hole groups 2, thereby reducing the impact on the dielectric filter 10 and effectively improving the far-end suppression capability of the dielectric filter 10.

[0082] It should be noted that when the dielectric filter 10 has multiple hole groups 2, the angles of the intersection angles α of the multiple hole groups 2 can be the same, different, or partially the same. The specific design can be based on actual needs and is not limited here.

[0083] In a specific embodiment, as shown in FIG. 1 to FIG. 7 , in a hole group 2 , the first hole 21 and the second hole 22 may be interconnected to reduce the space occupied by the hole group 2 in the third direction X, thereby facilitating the miniaturization design of the dielectric filter 10 .

[0084] In another specific embodiment, referring to FIG8 , which is a schematic structural diagram of the dielectric filter provided by the present application, the first hole 21 and the second hole 22 may be staggered, that is, the first hole 21 and the second hole 22 may not be connected.

[0085] In this embodiment, as shown in FIG8 , the hole group 2 of this structure can further reduce process requirements, is more convenient for forming the hole group 2 , and has a higher degree of freedom. Moreover, when other structures or components are provided between two adjacent dielectric resonators 1 , the hole group 2 of this structure can more reasonably arrange the first hole 21 and the second hole 22 in the space between the two adjacent dielectric resonators 1 , thereby facilitating the miniaturization design of the dielectric filter 10 .

[0086] Please refer to Figure 9, which is a schematic diagram of the structure of the dielectric filter provided in another embodiment of the present application. In one embodiment, as shown in Figure 9, in at least one hole group 2, there are multiple first holes 21, and at least one first hole 21 is connected to the second hole 22.

[0087] In this embodiment, as shown in FIG9 , when there are multiple first holes 21, at least one of the multiple first holes 21 is connected to the second hole 22, or all of the first holes 21 are connected to the second hole 22. In other words, multiple first holes 21 can be connected to one second hole 22 at the same time, or some of the first holes 21 can be connected to one second hole 22 while the other part is not connected, thereby further improving the design freedom of the hole group 2 structure, improving the rationality of the space between two adjacent dielectric resonators 1, and further improving the design freedom and adjustment range of the hole group 2 itself, thereby reducing the impact of the hole group 2 itself on the far-end suppression of the dielectric filter 10.

[0088] Furthermore, the intersection angles α of the projections of the plurality of first holes 21 and the second holes 22 on the third direction X may be the same, partially the same, or different. The specific setting may be made according to actual needs and is not limited here.

[0089] Please refer to Figure 10, which is a schematic diagram of the structure of the dielectric filter provided by the embodiment of the present application in another specific embodiment. In another specific embodiment, as shown in Figure 10, in at least one hole group 2, there are multiple second holes 22, and at least one second hole 22 is connected to the first hole 21.

[0090] In this embodiment, as shown in FIG10 , when there are multiple second holes 22, at least one of the multiple second holes 22 may be connected to the first hole 21, or all of the second holes 22 may be connected to the first hole 21. In other words, multiple second holes 22 may be connected to one first hole 21 at the same time, or some of the second holes 22 may be connected to one first hole 21 while the other part is not connected, thereby further improving the design freedom of the hole group 2 structure, increasing the rationality of the space between two adjacent dielectric resonators 1, and further improving the design freedom and adjustment range of the frequency of the hole group 2 itself, thereby reducing the impact of the frequency of the hole group 2 itself on the far-end suppression of the dielectric filter 10.

[0091] Furthermore, the intersection angles α of the projections of the plurality of second holes 22 and the first holes 21 on the third direction X may be the same, partially the same, or different. The specific setting may be made according to actual needs and is not limited here.

[0092] In another specific embodiment, in a hole group 2, there may also be multiple first holes 21 and multiple second holes 22 at the same time. The multiple first holes 21 and the multiple second holes 22 can be fully connected, completely disconnected, or partially connected. The specific setting can be made according to actual needs and is not limited here.

[0093] It should be noted that when there are multiple hole groups 2 in the dielectric filter 10, the multiple hole groups 2 can be completely identical, partially identical, or different from each other. The specific configuration can be made according to actual needs and is not limited here.

[0094] Depending on the specific structure of the dielectric filter 10 , the preparation method of the dielectric filter 10 may also be different.

[0095] In a specific embodiment, as shown in FIG. 1 to FIG. 10 , the dielectric filter 10 may be an integrally formed structure, that is, at least two adjacent dielectric resonators 1 are integrally formed, thereby facilitating mass production of the dielectric filter 10 and saving production costs.

[0096] In another specific embodiment, two adjacent dielectric resonators 1 of the dielectric filter 10 can be formed separately first, and then the dielectric filter 10 is formed by co-firing or other methods. That is, one of the at least two adjacent dielectric resonators 1 includes a first co-fired surface 41, and the other includes a second co-fired surface 51. The first co-fired surface 41 and the second co-fired surface 51 are opposite to each other. The first co-fired surface 41 is provided with a first groove 42, and the second co-fired surface 51 is provided with a second groove 52. The second groove 52 corresponds to the first groove 42. The first co-fired surface 41 and the second co-fired surface 51 are connected. The first groove 42 and the second groove 52 surround the first hole 21 and / or the second hole 22.

[0097] In this embodiment, as shown in FIG. 11 , first grooves 42 and second grooves 52 corresponding to the first holes 21 and / or second holes 22 of the hole group 2 can be pre-formed on the first co-fired surface 41 and the second co-fired surface 51. Thus, when two adjacent dielectric resonators 1 are connected via the first co-fired surface 41 and the second co-fired surface 51, the first grooves 42 and the second grooves 52 are joined to enclose and form the first holes 21 and / or the second holes 22. This facilitates the formation of first holes 21 and / or second holes 22 having relatively complex structures, thereby increasing the degree of freedom in the design of the dielectric filter 10.

[0098] Of course, when a dielectric filter 10 includes a plurality of dielectric resonators 1, two adjacent dielectric resonators 1 may be partially formed as one piece, while the other part may be formed by co-firing, so as to further reduce the cost and improve the degree of design freedom.

[0099] In the specific embodiment shown in FIG11 , FIG11 is a schematic structural diagram of another specific embodiment of the dielectric filter provided by the embodiment of the present application. As shown in FIG11 , the dielectric filter 10 includes a first dielectric resonator 3, a second dielectric resonator 4, a third dielectric resonator 5, and a fourth dielectric resonator 6, which are arranged in sequence. There is no hole group 2 structure between the first dielectric resonator 3 and the second dielectric resonator 4, there is a hole group 2 structure between the second dielectric resonator 4 and the third dielectric resonator 5, and there is no hole group 2 structure between the third dielectric resonator 5 and the fourth dielectric resonator 6.

[0100] In the specific embodiment shown in FIG11 , the first dielectric resonator 3 and the second dielectric resonator 4 are integrally formed, and the third dielectric resonator 5 and the fourth dielectric resonator 6 are integrally formed. A first co-fired surface 41 and a second co-fired surface 51 are formed on opposing surfaces of the second dielectric resonator 4 and the third dielectric resonator 5, respectively. First grooves 42 and second grooves 52 are formed on the surfaces of the first co-fired surface 41 and the second co-fired surface 51, respectively. Finally, the second dielectric resonator 4 and the third dielectric resonator 5 are co-fired and connected via the first co-fired surface 41 and the second co-fired surface 51. The first grooves 42 and the second grooves 52 are arranged to form the hole group 2. This minimizes costs, facilitates the molding of a relatively complex hole group 2, and improves manufacturing efficiency.

[0101] In a specific embodiment, the surface of at least one of the resonant cavity 12, the first hole 21, and the second hole 22 is covered with a metallization layer, thereby reducing the leakage of harmonic energy, ensuring reliable signal transmission, and improving signal transmission efficiency.

[0102] The metallization layer may completely cover the surface of at least one of the resonant cavity 12, the first hole 21, and the second hole 22. Of course, the metallization layer may also partially cover the surface of at least one of the resonant cavity 12, the first hole 21, and the second hole 22 to adjust the resonant frequency of the dielectric resonator 1, thereby improving the far-end suppression capability of the dielectric filter 10. The specific structure of the metallization layer can be set according to actual needs and is not limited here.

[0103] The material of the metallization layer can be silver, copper or other metal materials, which is not limited here.

[0104] The second aspect of the present application also provides a communication device, including the dielectric filter 10 in any of the above embodiments. Since the dielectric filter 10 has the above technical effects, the communication device including the dielectric filter 10 should also have corresponding technical effects, which will not be described in detail here.

[0105] Furthermore, the communication device may be, but is not limited to, a duplexer, a multiplexer, a base station, a terminal device, etc. The embodiments of the present application do not impose any special restrictions on the specific form of the above-mentioned communication devices.

[0106] Based on the above embodiments, under the same scenario, a simulation comparison diagram of the far-end suppression curve of the dielectric filter provided by the embodiment of the present application and the far-end suppression curve of the conventional dielectric filter is shown in Figure 12. In Figure 12, curve 1 is the far-end suppression curve of the dielectric filter provided by the embodiment of the present application, and curve 2 is the far-end suppression curve of the conventional dielectric filter, wherein the horizontal axis represents the frequency in (GHz), and the vertical axis represents the far-end suppression of the dielectric filter in (dB). As can be seen from Figure 12, the coupling strength between the high-order modes in the high-order harmonic band of the dielectric filter 10 provided by the embodiment of the present application is significantly reduced, thereby effectively improving the far-end suppression of the dielectric filter 10, which is beneficial to the design requirement of removing the low-pass filter to reduce the insertion loss in the communication equipment system.

[0107] The above description is merely a specific implementation of the embodiments of the present application, but the scope of protection of the embodiments of the present application is not limited thereto. Any changes or substitutions within the technical scope disclosed in the embodiments of the present application shall be included in the scope of protection of the embodiments of the present application. Therefore, the scope of protection of the embodiments of the present application shall be based on the scope of protection of the claims.

Claims

1. A dielectric filter, characterized in that: include: At least two dielectric resonators connected to each other, each of the dielectric resonators comprising a dielectric body and a resonant cavity, along a first direction of the dielectric filter, the dielectric body comprising a top surface and a bottom surface, the resonant cavity passing through the top surface or the bottom surface, along a second direction of the dielectric filter, the dielectric body further comprising a first side surface and a second side surface; A hole group, the hole group is arranged between two adjacent dielectric resonators, each of the hole groups includes a first hole and a second hole, two ends of the first hole respectively penetrate the top surface and the bottom surface, and the second hole penetrates at least one of the first side surface and the second side surface; Along the third direction of the dielectric filter, projections of the first hole and the second hole intersect.

2. The dielectric filter according to claim 1, characterized in that: The included angle between the projections of the first hole and the second hole in the third direction is a crossing angle; There are at least two intersection angles whose angles are different.

3. The dielectric filter according to claim 1 or 2, characterized in that: In at least one of the hole groups, the first hole is connected to the second hole.

4. The dielectric filter according to any one of claims 1 to 3, characterized in that: In at least one of the hole groups, the first hole is staggered with the second hole.

5. The dielectric filter according to any one of claims 1 to 4, characterized in that: In at least one of the hole groups, there are a plurality of first holes, and at least one of the first holes is communicated with the second hole.

6. The dielectric filter according to any one of claims 1 to 5, characterized in that: In at least one of the hole groups, there are a plurality of second holes, and at least one of the second holes is communicated with the first hole.

7. The dielectric filter according to any one of claims 1 to 6, characterized in that: There are at least two adjacent dielectric resonators, one of which includes a first co-fired surface, and the other includes a second co-fired surface, and the first co-fired surface and the second co-fired surface are opposite to each other; The first co-fired surface is provided with a first groove; The second co-fired surface is provided with a second groove, and the second groove corresponds to the first groove; The first co-fired surface and the second co-fired surface are connected, and the first groove and the second groove are arranged to form the first hole and / or the second hole.

8. The dielectric filter according to any one of claims 1 to 6, characterized in that: At least two adjacent dielectric resonators are integrally formed.

9. The dielectric filter according to any one of claims 1 to 6, characterized in that: The first hole is a straight through hole or a curved through hole.

10. The dielectric filter according to claim 9, characterized in that: The cross section of the first hole is one of rectangular, circular, elliptical, triangular and T-shaped.

11. The dielectric filter according to any one of claims 1 to 6, characterized in that: The second hole is a straight hole or a curved hole.

12. The dielectric filter according to claim 11, characterized in that: The cross section of the second hole is one of a rectangle, a circle, an ellipse, a triangle, and a T-shape.

13. The dielectric filter according to any one of claims 1 to 6, characterized in that: A surface of at least one of the resonant cavity, the first hole, and the second hole is covered with a metallization layer.

14. A communication device, characterized in that: A dielectric filter comprising the dielectric filter according to any one of claims 1 to 13.

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