Dielectric filter and communication device

Abstract

The application relates to a dielectric filter and a communication device, comprising at least two dielectric resonators and hole groups connected with each other, each dielectric resonator 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 penetrating 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, the hole groups being arranged between two adjacent dielectric resonators, each hole group comprising a first hole and a second hole, two ends of the first hole penetrating through the top surface and the bottom surface respectively, the second hole penetrating through at least one of the first side surface and the second side surface, along a third direction of the dielectric filter, projections of the first hole and the second hole intersecting each other, so that the magnetic field between the two adjacent dielectric resonators is more fully cut, the coupling strength between high-order modes of high-order harmonics is reduced, the far-end suppression capability of the dielectric filter is improved, a low-pass filter does not need to be additionally arranged, and the cost and the insertion loss are reduced.

Description

Technical Field

[0001] This application relates to the field of communication technology, and in particular to a dielectric filter and communication device. Background Technology

[0002] With the development of communication technology, the demand for power reduction in communication systems is becoming increasingly strong. 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 typically 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 its ability to suppress higher harmonics, i.e., the far-end suppression capability of the dielectric filter is poor, failing to meet user requirements. In existing technologies, higher harmonics are generally suppressed by adding an additional low-pass filter in conjunction with the dielectric filter. However, adding an additional low-pass filter correspondingly increases insertion loss, thus increasing the power consumption of the communication system, which is detrimental to the design requirements for reducing system power consumption. Summary of the Invention

[0003] This application provides a dielectric filter and a communication device to solve the problem in the prior art where the dielectric filter has poor far-end suppression performance, requiring the addition of an additional low-pass filter for far-end suppression.

[0004] A first aspect of this application provides a dielectric filter, including at least two interconnected dielectric resonators and a group of holes. Each dielectric resonator includes a dielectric body and a resonant cavity. Along a first direction of the dielectric filter, the dielectric body includes a top surface and a bottom surface, and the resonant cavity penetrates through the top surface or the bottom surface. Along a second direction of the dielectric filter, the dielectric body also includes a first side surface and a second side surface. The group of holes is disposed between two adjacent dielectric resonators, and each group of holes includes a first hole and a second hole. The two ends of the first hole penetrate through the top surface and the bottom surface, respectively, and the second hole penetrates 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.

[0005] In this 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, thereby reducing the magnetic field distribution area of ​​the dielectric filter. This improves the suppression capability of higher harmonics, reduces the coupling strength between higher-order modes, and enhances the far-end suppression capability of the dielectric filter. Furthermore, since the projections of the first and second holes in the third direction intersect, the hole group can generate components in various directions in the plane perpendicular to the third direction. This allows the magnetic field between the two adjacent dielectric resonators to be cut in all directions, thus more fully cutting the magnetic field between the two adjacent dielectric resonators. This further reduces the magnetic field distribution area of ​​the dielectric filter, further reduces the coupling strength between higher-order modes of higher harmonics, and further enhances the far-end suppression capability of the dielectric filter. Furthermore, compared to existing traditional dielectric filters that require an additional low-pass filter to suppress higher harmonics, the dielectric filter in this application has strong far-end suppression capability, eliminating the need for an additional low-pass filter to suppress higher harmonics. This reduces manufacturing costs and insertion loss caused by adding a low-pass filter, thereby reducing the power consumption of communication equipment and meeting user needs. In other words, it facilitates the design requirement of removing the low-pass filter to reduce insertion loss in communication equipment systems, improving the user experience.

[0006] In one possible design, the angle between the projections of the first hole and the second hole onto the third direction is a cross angle, and there are at least two cross angles with different angles.

[0007] In this scheme, changing the intersection angle of the first and second holes in the aperture group can adjust the resonant frequency of the aperture group itself. This ensures sufficient cutting of the magnetic field between adjacent dielectric resonators while reducing the impact of the aperture group's own resonant frequency on the far-end rejection of the dielectric filter, thus improving the far-end rejection capability of the dielectric filter. Especially in dielectric filter structures with multiple aperture groups, different intersection angles among the aperture groups result in different resonant frequencies for each group. This reduces the mutual excitation between the resonant frequencies of the multiple aperture groups, thereby minimizing their impact on the dielectric filter and effectively improving its far-end rejection capability.

[0008] In one possible design, in at least one of the aperture groups, the first aperture is connected to the second aperture to reduce the space occupied by the aperture group in the third direction, thereby facilitating the miniaturization design of the dielectric filter.

[0009] In one possible design, in at least one of the hole groups, the first hole and the second hole are staggered, which can further reduce the process requirements, facilitate the formation of the hole group, and have a higher degree of freedom. When there are other structures or components between two adjacent dielectric resonators, the hole group of this structure can more reasonably set the first hole and the second hole in the space between the two adjacent dielectric resonators, which is conducive to the miniaturization design of the dielectric filter.

[0010] In one possible design, in at least one of the hole groups, the first hole has multiple holes, and at least one of the first holes is connected to the second hole, so as to further enhance the design freedom of the hole group structure, improve the spatial rationality of the hole group between two adjacent dielectric resonators, and 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.

[0011] In one possible design, in at least one of the aperture groups, the second aperture has multiple second apertures, and at least one second aperture is connected to the first aperture, so as to further enhance the design freedom of the aperture group structure, improve the spatial rationality of the aperture group between two adjacent dielectric resonators, and further enhance the design freedom and adjustment range of the aperture group's own frequency, so as to reduce the influence of the aperture group's own frequency on the far-end suppression of the dielectric filter.

[0012] In one possible design, at least two adjacent dielectric resonators exist, 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 is opposite 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 to form the first hole and / or the second hole.

[0013] In this scheme, a first groove and a second groove corresponding to the first hole and / or the second hole of the hole group can be pre-prepared on the first co-fired surface and the second co-fired surface. When two adjacent dielectric resonators are connected through the first co-fired surface and the second co-fired surface, the first groove and the second groove are joined to form the first hole and / or the second hole. This facilitates the formation of the more complex first hole and / or the second hole and improves the design freedom of the dielectric filter.

[0014] In one possible design, at least two adjacent dielectric resonators are integrally formed, which facilitates the mass production of dielectric filters and saves manufacturing costs.

[0015] In one possible design, the first hole is either a straight through hole or a curved through hole to increase the design freedom of the first hole.

[0016] In one possible design, the cross-section of the first hole is one of rectangular, circular, elliptical, triangular, or T-shaped to facilitate the machining of the first hole.

[0017] In one possible design, the second hole can be a straight hole or a curved hole to increase the design freedom of the second hole.

[0018] In one possible design, the cross-section of the second hole is one of rectangular, circular, elliptical, triangular, or T-shaped to facilitate the machining of the second hole.

[0019] In one possible design, at least one of the resonant cavity, the first aperture, and the second aperture has a metallized layer on its surface, thereby reducing harmonic energy leakage, ensuring reliable signal transmission, and improving signal transmission efficiency.

[0020] A second aspect of this application also provides a communication device including the dielectric filter described in any of the above embodiments. Since the dielectric filter possesses the aforementioned technical effects, the communication device including the dielectric filter should also possess corresponding technical effects, which will not be elaborated further here.

[0021] It should be understood that the above general description and the following detailed description are merely exemplary and do not limit this application. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the dielectric filter provided in an embodiment of this application in a specific embodiment;

[0023] Figure 2 This is a schematic diagram of the structure of the dielectric filter provided in the embodiments of this application in another specific embodiment;

[0024] Figure 3 This is a schematic diagram of the structure of the dielectric filter provided in the embodiments of this application in another specific embodiment;

[0025] Figure 4 This is a schematic diagram of the structure of the dielectric filter provided in the embodiments of this application in another specific embodiment;

[0026] Figure 5 This is a schematic diagram of the structure of the dielectric filter provided in the embodiments of this application in another specific embodiment;

[0027] Figure 6 This is a schematic diagram of the structure of the dielectric filter provided in the embodiments of this application in another specific embodiment;

[0028] Figure 7This is a schematic diagram of the structure of the dielectric filter provided in the embodiments of this application in another specific embodiment;

[0029] Figure 8 This is a schematic diagram of the structure of the dielectric filter provided in the embodiments of this application in another specific embodiment;

[0030] Figure 9 This is a schematic diagram of the structure of the dielectric filter provided in the embodiments of this application in another specific embodiment;

[0031] Figure 10 This is a schematic diagram of the structure of the dielectric filter provided in the embodiments of this application in another specific embodiment;

[0032] Figure 11 This is a schematic diagram of the structure of the dielectric filter provided in the embodiments of this application in another specific embodiment;

[0033] Figure 12 A simulation comparison diagram of the far-end suppression curve of the dielectric filter provided in the embodiments of this application and the far-end suppression curve of a conventional dielectric filter.

[0034] Figure label:

[0035] 10-Dielectric filter;

[0036] 1-Dielectric resonator;

[0037] 11-Media body;

[0038] 12-Resonant cavity;

[0039] 13-Top surface;

[0040] 14-Bottom;

[0041] 15 - First side view;

[0042] 16 - Second side view;

[0043] 2-hole group;

[0044] 21-First hole;

[0045] 22 - Second hole;

[0046] 3-First dielectric resonator;

[0047] 4-Second dielectric resonator;

[0048] 41-First roasted dough;

[0049] 42-First slot;

[0050] 5-Third dielectric resonator;

[0051] 51-Second co-fired surface;

[0052] 52 - Second slot;

[0053] 6-Fourth dielectric resonator;

[0054] X - Third-party direction;

[0055] Y - Second direction;

[0056] Z - First direction.

[0057] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. Detailed Implementation

[0058] To better understand the technical solution of this application, the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0059] In the description of this application, unless otherwise expressly specified and limited, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; unless otherwise specified or explained, the term "multiple" refers to two or more; the terms "connected," "fixed," etc., should be interpreted broadly. For example, "connected" can be 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. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0060] In one specific embodiment, the present application will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0061] With the development of communication technology, the demand for power reduction in communication systems is becoming increasingly strong. Dielectric filters are being used more and more widely 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 suppression capability of higher harmonic bands. In other words, the far-end suppression capability of the dielectric filter is poor and cannot meet the user's needs.

[0062] In existing technologies, high-order harmonics are generally suppressed by adding an additional low-pass filter in conjunction with a dielectric filter. However, adding an additional low-pass filter will increase insertion loss, thereby increasing the power consumption of the communication system, which is not conducive to the design requirement of reducing system power consumption.

[0063] To address the aforementioned technical problems, this application provides a dielectric filter to improve its far-end suppression capability, thereby eliminating the need for an additional low-pass filter to suppress higher harmonics. This dielectric filter can be applied to communication equipment. Due to its strong far-end suppression capability, it eliminates the need for an additional low-pass filter to suppress higher harmonics, reducing insertion loss in the communication equipment system and thus lowering power consumption to meet user needs. The communication equipment can be, but is not limited to, duplexers, multiplexers, base stations, terminal equipment, etc., and this application does not impose any special limitations on the specific form of the aforementioned communication equipment.

[0064] To more clearly describe the technical solutions of the embodiments of this application, the dielectric filter and communication device provided in the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0065] Reference Figure 1 , Figure 1 This is a schematic diagram of the structure of the dielectric filter provided in an embodiment of this application, in one specific embodiment. Figure 1 As shown, 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 penetrates 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 of a certain frequency to pass through, thereby realizing the filtering function.

[0066] like Figure 1 As shown, the dielectric filter 10 in this embodiment further includes a hole group 2. Along the second direction Y of the dielectric filter 10, the dielectric body 11 also 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 two adjacent dielectric resonators 1, thereby reducing the magnetic field distribution area of ​​the dielectric filter 10, which can improve the suppression capability of higher harmonics, reduce the coupling strength between higher modes, and improve the far-end suppression capability of the dielectric filter 10.

[0067] Furthermore, such as Figure 1 and Figure 2 As shown, Figure 2 This is a schematic diagram of the structure of the dielectric filter provided in another specific embodiment of the present application. Each hole group 2 includes a first hole 21 and a second hole 22. The two ends of the first hole 21 pass through the top surface 13 and the bottom surface 14, respectively. The second hole 22 passes through at least one of the first side surface 15 and the second side surface 16. The projections of the first hole 21 and the second hole 22 intersect along the third direction X of the dielectric filter 10.

[0068] in, Figure 1 In the hole group 2 of the dielectric filter 10 shown, the two ends of the second hole 22 pass through the first side 15 and the second side 16 respectively, that is, the second hole 22 can be a through hole. Figure 2 In the hole group 2 of the dielectric filter 10 shown, one end of the second hole 22 passes through the first side 15, while the other end does not pass through the second side 16. Of course, the second hole 22 can also pass through the second side 16 at one end and not pass through the first side 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 there are no restrictions here.

[0069] In this embodiment, as Figure 1 As shown, since the projections of the first aperture 21 and the second aperture 22 on the third direction X intersect, the aperture group 2 can generate components in various directions in the plane perpendicular to the third direction X. This allows for the cutting of the magnetic field between two adjacent dielectric resonators 1 in all directions, thus more effectively cutting the magnetic field between the two adjacent dielectric resonators 1. This further reduces the magnetic field distribution area of ​​the dielectric filter 10, further reduces the coupling strength between higher-order modes of higher harmonics, and further improves the far-end suppression capability of the dielectric filter 10. Furthermore, compared to existing traditional dielectric filters that require an additional low-pass filter to suppress higher harmonics, the dielectric filter 10 of this embodiment has strong far-end suppression capability, eliminating the need for an additional low-pass filter to suppress higher harmonics. This reduces manufacturing costs and insertion loss caused by adding a low-pass filter, thereby reducing the power consumption of the communication equipment and meeting user needs. It also facilitates the design requirement of removing the low-pass filter to reduce insertion loss in communication equipment systems, improving the user experience.

[0070] It should be noted that, Figure 1 The dielectric filter 10 shown only illustrates the case where a group of holes 2 is provided between each pair of adjacent dielectric resonators 1. Optionally, when the dielectric filter 10 has three or more dielectric resonators 1, a group of holes 2 may be provided between any two adjacent dielectric resonators 1, or a group of holes 2 may be provided between some of the adjacent dielectric resonators 1. Further, the number of groups of holes 2 between two adjacent dielectric resonators 1 can be one, two, three, or more. Since the position and number of groups of holes 2 will produce different cutting effects on the magnetic field of the dielectric filter 10, the position and specific number of groups of holes 2 can be designed according to actual needs and are not limited here.

[0071] in addition, Figure 1The dielectric filter 10 shown is only illustrated as a simple and intuitive cuboid structure, but it should be understood that... Figure 1 This is just one specific implementation. The dielectric filter 10 provided in this application embodiment is not limited to a cuboid, 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 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 penetrate through any one of the multiple top surfaces 13, and the other end of the first hole 21 can penetrate through any one of the multiple bottom surfaces 14. The second hole 22 penetrates through at least one of the multiple first side surfaces 15 and 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, there is no limitation here.

[0072] Furthermore, referring to Figures 3-5 , Figures 3-5 These are schematic diagrams of the dielectric filter provided in the embodiments of this application in other specific embodiments.

[0073] like Figures 1-5 As shown, the first hole 21 can be a straight through hole to facilitate its machining. The first hole 21 can be a vertical hole or an inclined hole. Alternatively, the first hole 21 can be a curved through hole, such as 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.

[0074] Furthermore, the cross-sectional shape of the first hole 21 can be varied, for example, as... Figure 1 The circle shown, as Figure 2 and Figure 3 The square shown, as Figure 4 The rectangle shown is as follows: Figure 5 The shapes shown are simple, such as ellipses, to facilitate the forming of the first hole 21. Of course, the cross-sectional shape of the first hole 21 can also be triangular, T-shaped, 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.

[0075] like Figures 1-5 As shown, the second hole 22 can be a straight hole to facilitate its machining. 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.

[0076] Furthermore, the cross-sectional shape of the second hole 22 can also be varied, for example, as shown in... Figure 1 The circle shown, as Figure 2 and Figure 3 The square shown, as Figure 4 The rectangle shown is as follows: Figure 5 The shapes shown are simple, such as ellipses, to facilitate the forming of the second hole 22. Of course, the cross-sectional shape of the second hole 22 can also be triangular, T-shaped, 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.

[0077] It should be noted that the shape and structure of the first hole 21 and the second hole 22 can be the same or different. The specific design can be made according to actual needs, and no restrictions are imposed here.

[0078] In one specific embodiment, such as Figure 6 and Figure 7 As shown, Figure 6 and Figure 7 The following are schematic diagrams of the dielectric filter provided in this application in other specific embodiments. The angle between the projections of the first aperture 21 and the second aperture 22 onto the third direction X is called the 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 aperture 21 and the second aperture 22 onto the third direction X can be 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.

[0079] In this embodiment, as Figure 6 and Figure 7As shown, since each aperture 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 aperture groups 2 in the dielectric filter 10, and the frequencies of the multiple aperture groups 2 are the same or similar, this will cause the resonant frequencies of the multiple aperture groups 2 to mutually excite each other, thereby increasing the impact on the far-end suppression capability of the dielectric filter 10 and reducing the far-end suppression capability of the dielectric filter 10. Changing the cross angle α of the first aperture 21 and the second aperture 22 of the aperture group 2 can adjust the resonant frequency of the aperture group 2 itself. This can ensure that the aperture group 2 sufficiently cuts the magnetic field of the two adjacent dielectric resonators 1, while also reducing the impact of the resonant frequency of the aperture group 2 itself on the far-end suppression capability of the dielectric filter 10, thus improving the far-end suppression capability of the dielectric filter 10. Especially in the structure of multiple hole groups 2 in the dielectric filter 10, the cross angle α of the multiple hole groups 2 is 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, reducing the impact on the dielectric filter 10, and effectively improving the far-end suppression capability of the dielectric filter 10.

[0080] It should be noted that when the dielectric filter 10 has multiple aperture groups 2, the angles of the cross angles α of the multiple aperture groups 2 can all be the same, all be different, or all be partially the same. The specific design can be made according to actual needs, and no restrictions are imposed here.

[0081] In one specific embodiment, such as Figures 1 to 7 As shown, in a hole group 2, the first hole 21 and the second hole 22 can 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.

[0082] In another specific embodiment, please refer to Figure 8 , Figure 8 This is a schematic diagram of the structure of the dielectric filter provided in an embodiment of this application in another specific embodiment. For example... Figure 8 As shown, the first hole 21 and the second hole 22 can also be staggered, that is, the first hole 21 and the second hole 22 may not be connected.

[0083] In this embodiment, as Figure 8 As shown, the hole group 2 of this structure can further reduce the process requirements, make it easier to form the hole group 2, and has a higher degree of freedom. When there are other structures or components between two adjacent dielectric resonators 1, the hole group 2 of this structure can more reasonably set the first hole 21 and the second hole 22 in the space between the two adjacent dielectric resonators 1, so as to facilitate the miniaturization design of the dielectric filter 10.

[0084] Please refer to Figure 9 , Figure 9This is a schematic diagram of the structure of the dielectric filter provided in one embodiment of this application in another specific embodiment. In one specific embodiment, as shown... Figure 9 As shown, in at least one group of holes 2, there are multiple first holes 21, and at least one first hole 21 is connected to a second hole 22.

[0085] In this embodiment, as Figure 9 As shown, 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 the first holes 21 are connected to the second hole 22. That is, multiple first holes 21 can be connected to one second hole 22 at the same time, or some first holes 21 can be connected to one second hole 22 while others are not connected, so as to further improve the design freedom of the hole group 2 structure, improve the spatial rationality of the hole group 2 between two adjacent dielectric resonators 1, and also further improve the design freedom and adjustment range of the hole group 2's own frequency, so as to reduce the influence of the hole group 2's own frequency on the far-end suppression of the dielectric filter 10.

[0086] Furthermore, the intersection angle α of the projections of multiple first holes 21 and second holes 22 onto the third direction X can be the same, partially the same, or different. The specific settings can be made according to actual needs, and no restrictions are imposed here.

[0087] Please refer to Figure 10 , Figure 10 This is a schematic diagram of the structure of the dielectric filter provided in an embodiment of this application in another specific embodiment. In another specific embodiment, as shown... Figure 10 As shown, in at least one group of holes 2, there are multiple second holes 22, and at least one second hole 22 is connected to the first hole 21.

[0088] In this embodiment, as Figure 10 As shown, when there are multiple second holes 22, at least one of the multiple second holes 22 is connected to the first hole 21, or all the second holes 22 are connected to the first hole 21. That is, multiple second holes 22 can be connected to one first hole 21 simultaneously, or some second holes 22 can be connected to one first hole 21 while others are not connected, in order to further improve the design freedom of the hole group 2 structure, improve the spatial rationality of the hole group 2 between two adjacent dielectric resonators 1, and also further improve the design freedom and adjustment range of the hole group 2's own frequency, so as to reduce the influence of the hole group 2's own frequency on the far-end suppression of the dielectric filter 10.

[0089] Furthermore, the intersection angle α of the projections of the multiple second holes 22 and the first hole 21 onto the third direction X can be the same, partially the same, or different. The specific settings can be made according to actual needs, and no restrictions are imposed here.

[0090] In another specific embodiment, a hole group 2 may also have multiple first holes 21 and multiple second holes 22 at the same time. The multiple first holes 21 and multiple second holes 22 may be fully connected, completely disconnected, or partially connected. The specific configuration can be set according to actual needs and is not limited here.

[0091] 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 completely different. The specific settings can be made according to actual needs, and no restrictions are imposed here.

[0092] Depending on the specific structure of the dielectric filter 10, the fabrication method of the dielectric filter 10 can also be different.

[0093] In one specific embodiment, such as Figures 1-10 As shown, the dielectric filter 10 can be a one-piece structure, that is, at least two adjacent dielectric resonators 1 are one piece, which facilitates the mass production of the dielectric filter 10 and saves manufacturing costs.

[0094] 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 can be formed by co-firing or other methods. That is, there are at least two adjacent dielectric resonators 1, one of which includes a first co-firing surface 41 and the other includes a second co-firing surface 51. The first co-firing surface 41 and the second co-firing surface 51 are opposite to each other. The first co-firing surface 41 is provided with a first groove 42, and the second co-firing surface 51 is provided with a second groove 52. The second groove 52 corresponds to the first groove 42. The first co-firing surface 41 and the second co-firing surface 51 are connected. The first groove 42 and the second groove 52 surround and form a first hole 21 and / or a second hole 22.

[0095] In this embodiment, as Figure 11 As shown, a first groove 42 and a second groove 52 corresponding to the first hole 21 and / or the second hole 22 of the hole group 2 can be pre-prepared on the first co-fired surface 41 and the second co-fired surface 51. Thus, when two adjacent dielectric resonators 1 are connected through the first co-fired surface 41 and the second co-fired surface 51, the first groove 42 and the second groove 52 are joined together to form the first hole 21 and / or the second hole 22. This facilitates the formation of the more complex first hole 21 and / or the second hole 22 and improves the design freedom of the dielectric filter 10.

[0096] Of course, when a dielectric filter 10 includes multiple dielectric resonators 1, two adjacent dielectric resonators 1 can be integrally formed, while the other part is co-fired to further reduce costs and increase design freedom.

[0097] like Figure 11 In the specific embodiment shown, Figure 11 This is a schematic diagram of the structure of the dielectric filter provided in an embodiment of this application in another specific embodiment. For example... Figure 11 As shown, 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 arranged sequentially. 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.

[0098] In such Figure 11 In the specific embodiment shown, 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 two opposite surfaces of the second dielectric resonator 4 and the third dielectric resonator 5, respectively. A first groove 42 and a second groove 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 through the first co-fired surface 41 and the second co-fired surface 51. The first groove 42 and the second groove 52 surround and form a hole group 2. This can minimize costs and facilitate the forming of the relatively complex hole group 2, thereby improving manufacturing efficiency.

[0099] In one specific embodiment, 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.

[0100] The metallization layer can completely cover the surface of at least one of the resonant cavity 12, the first hole 21, and the second hole 22. Alternatively, the metallization layer can 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.

[0101] The metallization layer can be made of metals such as silver or copper, and there are no restrictions on its material.

[0102] A second aspect of this application also provides a communication device, including the dielectric filter 10 in any of the above embodiments. Since the dielectric filter 10 possesses the aforementioned technical effects, the communication device including the dielectric filter 10 should also possess corresponding technical effects, which will not be elaborated further here.

[0103] Furthermore, the communication equipment may be, but is not limited to, a duplexer, a multiplexer, a base station, a terminal device, etc. The embodiments of this application do not impose any special restrictions on the specific form of the above-mentioned communication equipment.

[0104] Based on the above embodiments, under the same scenario, the simulation comparison diagram of the far-end suppression curve of the dielectric filter provided in this application embodiment and the far-end suppression curve of a conventional dielectric filter is shown below. Figure 12 As shown, Figure 12 Curve 1 is the far-end suppression curve of the dielectric filter provided in this embodiment, and curve 2 is the far-end suppression curve of a conventional dielectric filter. The horizontal axis represents frequency in GHz, and the vertical axis represents the far-end suppression of the dielectric filter in dB. Figure 12 As can be seen, the coupling strength between higher-order modes in the higher harmonic band of the dielectric filter 10 provided in this application embodiment is significantly reduced, thereby effectively improving the far-end suppression of the dielectric filter 10, which is beneficial to the design requirement of removing low-pass filters to reduce insertion loss in communication equipment systems.

[0105] The above descriptions are merely specific implementations of the embodiments of this application, but the protection scope of the embodiments of this application is not limited thereto. Any changes or substitutions within the technical scope disclosed in the embodiments of this application should be covered within the protection scope of the embodiments of this application. Therefore, the protection scope of the embodiments of this application should be determined by the protection scope of the claims.

Claims

1. A dielectric filter, characterized in that, include: At least two interconnected dielectric resonators, each dielectric resonator including a dielectric body and a resonant cavity, along a first direction of the dielectric filter, the dielectric body including a top surface and a bottom surface, the resonant cavity penetrating the top surface or the bottom surface, and along a second direction of the dielectric filter, the dielectric body also including a first side surface and a second side surface; A hole group is disposed between two adjacent dielectric resonators. Each hole group includes a first hole and a second hole. The two ends of the first hole pass through the top surface and the bottom surface, respectively, and the second hole passes through the first side surface and the second side surface. Along a third direction of the dielectric filter, the projections of the first aperture and the second aperture intersect.

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

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

4. The dielectric filter according to claim 1, characterized in that, In at least one of the hole groups, the first hole and the second hole are offset.

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

6. The dielectric filter according to any one of claims 1 to 4, characterized in that, In at least one of the hole groups, the second hole has a plurality of holes, and at least one of the second holes communicates with the first hole.

7. The dielectric filter according to any one of claims 1 to 4, 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, with the first co-fired surface and the second co-fired surface facing each other; The first co-fired surface is provided with a first groove; The second co-fired surface is provided with a second groove, which 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 4, characterized in that, At least two adjacent dielectric resonators are integrally formed.

9. The dielectric filter according to any one of claims 1 to 4, 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 the following: rectangular, circular, elliptical, triangular, or T-shaped.

11. The dielectric filter according to any one of claims 1 to 4, characterized in that, The second hole is either 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 the following: rectangular, circular, elliptical, triangular, or T-shaped.

13. The dielectric filter according to any one of claims 1 to 4, characterized in that, The 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, The dielectric filter includes any one of claims 1 to 13.

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