Dielectric filter and communication device

Abstract

The embodiment of the invention provides a dielectric filter and a communication device, the dielectric filter comprises a dielectric entity, and the dielectric entity is at least provided with a first resonance blind hole located in a first side surface and a second resonance blind hole located in a second side surface. The first resonant blind hole and the dielectric entity on the periphery of the first resonant blind hole form a first resonator, and the second resonant blind hole and the dielectric entity on the periphery of the second resonant blind hole form a second resonator. A first coupling through hole and a second coupling through hole are formed in the top surface of the dielectric entity, a first connecting part is arranged between the first coupling through hole and the second coupling through hole, and the first resonator and the second resonator realize negative coupling through the first connecting part. On the premise of not reducing the Q value of the single cavity of the resonator, the on-board area of the dielectric filter is reduced, and the miniaturization design of the dielectric filter is effectively realized. Moreover, the far-end suppression effect can be improved, and the loss of the dielectric filter is reduced.

Description

[0001] This application claims priority to Chinese patent application No. 202310677885.8 filed on June 8, 2023, and application name “A dielectric filter and communication device”, 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 a communication device. Background Art

[0003] A dielectric filter is a filtering device formed by coupling between dielectric resonators. Dielectric filters are widely used in communication devices such as communication base stations, satellite communications, and navigation systems. It can filter out signals outside the passband frequency and pass signals within the passband frequency to obtain signals of a specified frequency, which can effectively filter out interference signals.

[0004] In the related art, there is provided a dielectric filter, which includes a dielectric body, and a plurality of resonant blind holes are provided on the upper surface of the dielectric body. Each resonant blind hole and the dielectric body around it can form a resonator of the filter, and a signal can perform energy conversion of electric field and magnetic field between two adjacent resonators to achieve coupling between the two resonators. Usually, a coupling blind hole is also provided between two adjacent resonant blind holes, and the hole depth of the coupling blind hole is greater than the depth of the resonant blind hole, and the coupling blind hole is used to achieve negative coupling between the two resonators.

[0005] However, the single-cavity Q value of the dielectric filter is directly proportional to the projection size of the dielectric entity on the axial direction of the resonant blind hole. In the above-mentioned dielectric filter, the resonant blind hole is located on the upper surface of the dielectric entity, which makes the area occupied by the dielectric filter when installed on the mounting plate (that is, the on-board area) larger. Reducing the on-board area of ​​the dielectric filter will reduce the single-cavity Q value of the dielectric filter, which is not conducive to the miniaturization design of the dielectric filter. Summary of the invention

[0006] The present application provides a dielectric filter and a communication device, which can reduce the on-board area of ​​the dielectric filter without reducing the Q value of a single cavity of a resonator, thereby effectively realizing the miniaturized design of the dielectric filter.

[0007] A first aspect of the present application provides a dielectric filter, comprising a dielectric body, the dielectric body having a first side surface and a second side surface opposite to each other and a top surface located between the first side surface and the second side surface;

[0008] At least one group of resonant blind holes is formed on the dielectric entity, wherein the at least one group of resonant blind holes comprises a first group of resonant blind holes, and the first group of resonant blind holes comprises a first resonant blind hole and a second resonant blind hole;

[0009] The first resonant blind hole is located on the first side surface, and the second resonant blind hole is located on the second side surface;

[0010] The first resonant blind hole and the dielectric entity on its periphery form a first resonator, and the second resonant blind hole and the dielectric entity on its periphery form a second resonator;

[0011] A first coupling through hole and a second coupling through hole are provided on the top surface of the dielectric entity, a first connecting portion is provided between the first coupling through hole and the second coupling through hole, and the first resonator and the second resonator are negatively coupled via the first connecting portion.

[0012] The first resonant blind hole and the second resonant blind hole are opened on the side of the dielectric entity, and the first coupling through hole and the second coupling through hole are opened on the top surface of the dielectric entity to realize the negative coupling between the first resonator and the second resonator. When the projection area of ​​the dielectric entity in the height direction (that is, the direction from the upper surface to the lower surface of the dielectric entity) is reduced, the projection area of ​​the dielectric entity 110 in the axial direction of the resonant blind hole (the first resonant blind hole and the second resonant blind hole) will not be affected. In this way, the on-board area of ​​the dielectric filter can be reduced by reducing the projection area of ​​the dielectric entity in the height direction. Under the premise of not reducing the Q value of the single cavity of the resonator, the on-board area of ​​the dielectric filter is reduced, and the miniaturization design of the dielectric filter is effectively realized.

[0013] In a possible implementation, the at least one group of resonant blind holes further includes a second group of resonant blind holes, and the second group of resonant blind holes includes a third resonant blind hole and a fourth resonant blind hole;

[0014] The third resonant blind hole is located on the first side surface, and the fourth resonant blind hole is located on the second side surface;

[0015] The third resonant blind hole and the dielectric entity on its periphery form a third resonator, and the fourth resonant blind hole and the dielectric entity on its periphery form a fourth resonator;

[0016] A third coupling through hole is provided on the top surface of the dielectric entity, and two second connecting portions are provided on both sides of the third coupling through hole. The third resonator and the fourth resonator are positively coupled via the two second connecting portions.

[0017] In a possible implementation, a first coupling groove is further provided on the top surface of the dielectric entity, and the first coupling through hole and the second coupling through hole are both provided on the bottom wall of the first coupling groove.

[0018] The first coupling slot can adjust the size of the coupling channel between the first resonator and the second resonator, thereby changing the coupling amount between the first resonator and the second resonator.

[0019] In a possible implementation, a second coupling groove is further provided on the top surface of the dielectric entity, and the third coupling through hole is provided on the bottom wall of the second coupling groove.

[0020] The second coupling slot can adjust the size of the coupling channel between the third resonator and the fourth resonator, thereby changing the coupling amount between the third resonator and the fourth resonator, so that more forms of coupling amounts can be achieved between the third resonator and the fourth resonator.

[0021] In a possible implementation, a third coupling slot is further provided on the top surface of the dielectric entity, and the first coupling through hole, the second coupling through hole and the third coupling through hole are all provided on the bottom wall of the third coupling slot.

[0022] In a possible implementation, a fourth coupling slot is further provided on the top surface of the dielectric entity, and the first coupling through hole and the third coupling through hole are both provided on the bottom wall of the fourth coupling slot.

[0023] In a possible implementation, a fourth coupling through hole is further provided on the dielectric entity;

[0024] The fourth coupling through hole is located on the first side surface or the second side surface of the dielectric entity, and the fourth coupling through hole is located between two adjacent groups of resonant blind holes.

[0025] In a possible implementation, a fifth coupling slot is further provided on the top surface of the dielectric entity; the fifth coupling slot runs through from the first side surface of the dielectric entity to the second side surface, and the fifth coupling through hole is located between two adjacent groups of resonant blind holes.

[0026] The fifth coupling slot can also adjust the size of the coupling channel between the first resonator and the third resonator and between the second resonator and the fourth resonator, so that coupling with different coupling amounts can be achieved between two adjacent resonators.

[0027] In a possible implementation manner, a fifth coupling through hole is further provided on the top surface of the dielectric entity; the fifth coupling through hole is located between two adjacent groups of resonant blind holes.

[0028] The fifth coupling through hole can further adjust the size of the coupling channel between the first resonator and the third resonator and between the second resonator and the fourth resonator, so that coupling with different coupling amounts can be achieved between two adjacent resonators.

[0029] In a possible implementation manner, there are a plurality of the first group of resonant blind holes and a plurality of the second group of resonant blind holes; and the plurality of the first group of resonant blind holes and the plurality of the second group of resonant blind holes are arranged alternately.

[0030] In a possible implementation, the first resonant blind hole and the second resonant blind hole in the first group of resonant blind holes are coaxially arranged;

[0031] The third resonant blind hole and the fourth resonant blind hole in the second group of resonant blind holes are coaxially arranged.

[0032] This can improve the regularity of the overall structure of the dielectric filter, facilitate the design and production of the dielectric filter, and when simulating the dielectric filter, it can be convenient to determine the size of each resonant blind hole in the dielectric filter, thereby improving the work efficiency.

[0033] In a possible implementation, the dielectric filter further includes a conductive layer, and the conductive layer covers the surface of the dielectric entity.

[0034] In a possible implementation, the dielectric filter further includes a signal input terminal;

[0035] The signal input terminal is signal-connected to the first resonator.

[0036] In a possible implementation, a first coupling blind hole is further provided on the dielectric entity;

[0037] One end of the first coupling blind hole is connected to the signal input end, and the other end of the first coupling blind hole is connected to the first resonance blind hole.

[0038] In a possible implementation, a sixth coupling slot is further provided on the dielectric entity;

[0039] One end of the sixth coupling slot is communicated with the other end of the first coupling blind hole, and the other end of the sixth coupling slot is communicated with the first resonant blind hole.

[0040] In a possible implementation, the dielectric filter further includes a signal output terminal;

[0041] The signal input terminal is signal-connected to the second resonator.

[0042] A second aspect of the present application provides a communication device, comprising any one of the above-mentioned dielectric filters.

[0043] In a possible implementation, the communication device further includes an antenna, and the antenna is signal-connected to the dielectric filter. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 A schematic diagram of the structure of a dielectric filter provided in the related art;

[0045] Figure 2 A top view of a dielectric filter provided in the related art;

[0046] Figure 3 A schematic diagram of the structure of a dielectric filter provided in an embodiment of the present application at a viewing angle;

[0047] Figure 4 A schematic diagram of the structure of a dielectric filter provided in an embodiment of the present application from another perspective;

[0048] Figure 5 A top view of a dielectric filter provided in an embodiment of the present application;

[0049] Figure 6 A cross-sectional view of a dielectric filter provided in an embodiment of the present application;

[0050] Figure 7 A schematic diagram of the structure of another dielectric filter provided in an embodiment of the present application;

[0051] Figure 8 A top view of another dielectric filter provided in an embodiment of the present application;

[0052] Fig. 9 A schematic diagram of a structure of a signal input terminal provided in an embodiment of the present application;

[0053] Fig.10 is a signal echo efficiency diagram of a dielectric filter in the related art;

[0054] Fig.11 A signal echo efficiency diagram of a dielectric filter provided in an embodiment of the present application.

[0055] Description of reference numerals:

[0056] 100- dielectric filter; 110- dielectric entity; 111- first side;

[0057] 112-second side surface; 120-first group of resonant blind holes; 121-first resonant blind hole;

[0058] 122-second resonant blind hole; 123-first resonator; 124-second resonator;

[0059] 130-a second group of resonant blind holes; 131-a third group of resonant blind holes; 132-a fourth group of resonant blind holes;

[0060] 133 - a third resonator; 134 - a fourth resonator; 140 - a first coupling through hole;

[0061] 141 - second coupling through hole; 142 - first connecting portion; 143 - third coupling through hole;

[0062] 144-second connecting portion; 145-first coupling slot; 146-second coupling slot;

[0063] 147 - third coupling slot; 148 - fourth coupling slot; 149 - fourth coupling through hole;

[0064] 150 - fifth coupling slot; 151 - fifth coupling through hole; 160 - signal input terminal;

[0065] 161 - first coupling blind hole; 162 - sixth coupling groove. DETAILED DESCRIPTION

[0066] The terms used in the implementation section of this application are only used to explain the specific embodiments of this application and are not intended to limit this application.

[0067] A dielectric filter is a filtering device formed by coupling between dielectric resonators. Dielectric filters are widely used in communication devices such as communication base stations, satellite communications, and navigation systems. It can filter out signals outside the passband frequency and pass signals within the passband frequency to obtain signals of a specified frequency, which can effectively filter out interference signals.

[0068] Figure 1 is a structural schematic diagram of a dielectric filter provided in the related art, Figure 2 The figure is a top view of a dielectric filter provided in the related art.

[0069] In the related art, see Figure 1 and Figure 2 As shown, a dielectric filter 1 is provided, which includes a dielectric entity 11. A plurality of resonant blind holes are provided on the upper surface of the dielectric entity 11, for example, a first resonant blind hole 12 and a second resonant blind hole 13. Each resonant blind hole and the dielectric entity around it can form a resonator of the dielectric filter. A signal can perform energy conversion of electric field and magnetic field between two adjacent resonators to achieve coupling between the two resonators. A coupling blind hole is also provided between two adjacent resonant blind holes, for example, see Figure 1 and Figure 2As shown, a first coupling blind hole 14 (also called a negative coupling deep hole) can be opened between the first resonant blind hole 12 and the second resonant blind hole 13. The hole depth of the first coupling blind hole 14 is greater than the depth of the first resonant blind hole 12 and the second resonant blind hole 13. The first coupling blind hole 14 is used to achieve negative coupling between the resonator formed by the first resonant blind hole 12 and the resonator formed by the second resonant blind hole 13.

[0070] Generally, the single cavity Q value of a dielectric filter is directly proportional to the projection size of the dielectric entity on the axial direction of the resonant blind hole, that is, the larger the projection area of ​​the dielectric entity on the axial direction of the resonant blind hole, the larger the single cavity Q value of the dielectric filter, and vice versa. The single cavity Q value of a dielectric filter will affect the filtering efficiency of the dielectric filter, that is, the larger the single cavity Q value of a dielectric filter, the smaller its filtering loss, and vice versa.

[0071] However, in the above structure, the coupling blind hole occupies the area of ​​the upper surface of the dielectric entity, so that the area occupied by the dielectric filter when installed on the mounting plate (i.e., the on-board area) is large, which is not conducive to the miniaturization design of the dielectric filter. If the on-board area of ​​the dielectric filter is reduced by reducing the volume of the dielectric filter, the projection area of ​​the dielectric entity in the axial direction of the resonant blind hole (e.g., the first resonant blind hole 12 and the second resonant blind hole 13) will be correspondingly reduced, which will reduce the Q value of the resonator and increase the loss of the dielectric filter.

[0072] Moreover, the first coupling blind hole 14 in the dielectric filter will reduce the far-end suppression capability of the dielectric filter and reduce the out-of-band suppression effect of the dielectric filter. Therefore, during the use of the dielectric filter, it is usually necessary to use a low-pass line to suppress the out-of-band electromagnetic wave signal, and the low-pass line has insertion loss, which will increase the loss of the dielectric filter.

[0073] In order to solve the above problems, the researchers thought of improving the structure of the dielectric filter by opening the first resonant blind hole and the second resonant blind hole on the two sides of the dielectric entity, and opening the first coupling through hole and the second coupling through hole on the top surface of the dielectric entity, with a first connecting portion between the first coupling through hole and the second coupling through hole, and the first resonator and the second resonator can achieve negative coupling through the first connecting portion. When the projection area of ​​the dielectric entity in the height direction (that is, the direction from the upper surface to the lower surface of the dielectric entity) is reduced, the projection area of ​​the dielectric entity 110 in the axial direction of the resonant blind hole (the first resonant blind hole and the second resonant blind hole) will not be affected. In this way, the on-board area of ​​the dielectric filter can be reduced by reducing the projection area of ​​the dielectric entity in the height direction. Under the premise of not reducing the Q value of the single cavity of the resonator, the on-board area of ​​the dielectric filter is reduced, and the miniaturization design of the dielectric filter is effectively realized.

[0074] The dielectric filter provided in the embodiment of the present application is described in detail below with reference to the accompanying drawings.

[0075] Figure 3 A schematic diagram of the structure of a dielectric filter provided in an embodiment of the present application at a viewing angle, Figure 4 A schematic diagram of the structure of a dielectric filter provided in an embodiment of the present application from another perspective, Figure 5 A top view of a dielectric filter provided in an embodiment of the present application, Figure 6 A cross-sectional view of a dielectric filter provided in an embodiment of the present application.

[0076] The present application embodiment provides a dielectric filter 100, see Figure 3 and Figure 4 As shown, the dielectric filter 100 may include a dielectric entity 110. For example, the dielectric entity 110 may be formed of ceramics. The dielectric entity 110 may be integrally formed by an injection molding process, which may improve the structural stability and reliability of the dielectric entity 110. The dielectric entity 110 has a first side surface 111 and a second side surface 112 opposite to each other, and a top surface 113 located between the first side surface 111 and the second side surface 112.

[0077] At least one group of resonant blind holes may be provided on the dielectric entity 110. For example, the at least one group of resonant blind holes may include a first group of resonant blind holes 120. The first group of resonant blind holes 120 (see Figure 6 The first resonant blind hole 121 and the second resonant blind hole 122 may be located on the first side 111, and the second resonant blind hole 122 may be located on the second side 112. The first resonant blind hole 121 and the dielectric entity 110 around it may form a first resonator 123, and the second resonant blind hole 122 and the dielectric entity 110 around it may form a second resonator 124.

[0078] See also Figure 5 and Figure 6 As shown, a first coupling through hole 140 and a second coupling through hole 141 may be provided on the top surface 113 of the dielectric entity 110. For example, the first coupling through hole 140 and the second coupling through hole 141 may pass through from the top surface 113 of the dielectric entity 110 to the bottom surface of the dielectric entity 110. A first connecting portion 142 may be provided between the first coupling through hole 140 and the second coupling through hole 141, so that negative coupling is achieved between the first resonator 123 and the second resonator 124.

[0079] For example, the first coupling through hole 140 and the second coupling through hole 141 may be located near both sides of the first resonator 123 and the second resonator 124, so that the first connection portion 142 may be located near the middle of the first resonator 123 and the second resonator 124. The dielectric entity 110 materials at the corresponding positions of the first coupling through hole 140 and the second coupling through hole 141 may be removed, and the first connection portion 142 located between the first coupling through hole 140 and the second coupling through hole 141 may be left, so that the first resonator 123 and the second resonator 124 may be connected through the dielectric entity 110 materials corresponding to the first connection portion 142. The electromagnetic wave signal may propagate from the first resonator 123 to the second resonator 124 through the first connection portion 142, so as to realize negative coupling between the first resonator 123 and the second resonator 124.

[0080] For example, the dielectric filter 100 may further include a conductive layer (not shown in the figure), which may cover the surface of the dielectric entity 110. For example, the conductive layer may be provided on the first side surface 111, the second side surface 112, the top surface 113, the bottom surface of the dielectric entity 110, the inner wall of the first resonant blind hole 121, the inner wall of the second resonant blind hole 122, the inner wall of the first coupling through hole 140, and the inner wall of the second coupling through hole 141. The dielectric filter 100 may be understood as a closed cavity formed by the conductive layer, in which the dielectric entity 110 is filled.

[0081] For example, after the dielectric entity 110 is formed, a metal layer may be coated on the surface of the dielectric entity 110 by spraying or painting to form a conductive layer. For example, the conductive layer may be made of silver.

[0082] During operation, the electromagnetic wave signal can enter the dielectric filter 100 through the signal input port of the dielectric filter 100 and propagate in the dielectric entity 110. It propagates from one resonator to another adjacent resonator. For example, the electromagnetic wave signal can propagate from the first resonator 123 to the second resonator 124 through the first connecting portion 142 between the first coupling through hole 140 and the second coupling through hole 141. There is an electric field near the center of the resonator, and there is a magnetic field near the edge of the resonator, that is, near the conductive layer. The energy of the electric field and the magnetic field is constantly exchanged, so that the dielectric filter 100 generates electromagnetic resonance at certain similar frequencies, and the energy can be transmitted from the input end to the output end of the dielectric filter 100 at the resonance. There is electric field, magnetic field and magnetic field coupling between different resonators, which can form a passband between the resonators. Only signals with frequencies within the passband can pass, while signals of other frequencies cannot pass, thereby achieving a filtering effect.

[0083] When the electromagnetic wave signal encounters the conductive layer covering the dielectric entity 110, it can be reflected on the conductive layer. After the signal is repeatedly reflected in the dielectric filter 100, a part of the signal can be totally reflected and finally output from the signal output end of the dielectric filter 100. The other part of the signal cannot be totally reflected in the dielectric entity 110 and will return to the signal input end along the original path to filter out the signal.

[0084] In the process of electromagnetic wave signal propagating from the first resonator 123 to the second resonator 124, negative coupling between the first resonator 123 and the second resonator 124 can be achieved. Negative coupling is also called electrical coupling, which means that the first resonator 123 is mainly based on the conversion of electric field to magnetic field in the process of coupling with the second resonator 124, that is, the first resonator 123 is mainly based on the electric field in the process of coupling with the second resonator 124 through the first connecting portion 142. Negative coupling can generate transmission zeros (see Fig.11 Point A in the dielectric filter 100 can enhance the suppression effect and improve the suppression effect of the dielectric filter 100 on a signal at a certain frequency point, so that the signal corresponding to the frequency is better suppressed. For example, during the use of the dielectric filter 100, if a higher suppression requirement is required for a signal of a certain frequency, a negative coupling can be set in the dielectric filter 100, so that the coupling of several resonators is negative coupling, thereby achieving a stronger suppression of the signal of the frequency.

[0085] Among them, the size of the first connecting portion 142 can affect the size of the coupling channel (also called window) between the first resonator 123 and the second resonator 124. The larger the cross-sectional area of ​​the first connecting portion 142 in the direction from the first resonator 123 to the second resonator 124, the larger the coupling channel between the first resonator 123 and the second resonator 124, and the larger the signal frequency band that can pass through the coupling channel. At this time, the greater the coupling amount between the first resonator 123 and the second resonator 124, the wider the bandwidth.

[0086] On the contrary, the smaller the cross-sectional area of ​​the first connecting portion 142 in the direction from the first resonator 123 to the second resonator 124, the smaller the coupling channel between the first resonator 123 and the second resonator 124, and the smaller the signal frequency band that can pass through the coupling channel. At this time, the coupling amount between the first resonator 123 and the second resonator 124 is also smaller, and the smaller the coupling amount, the narrower the bandwidth.

[0087] Therefore, the coupling amount between the first resonator 123 and the second resonator 124 can be changed by changing the size of the first coupling hole 140, for example, by changing the cross-sectional area of ​​the first coupling hole 140 in the direction from the first resonator 123 to the second resonator 124, so as to change the size of the first connecting portion 142.

[0088] During the installation of the dielectric filter 100 , the bottom surface of the dielectric filter 100 may be installed on the mounting board. The area occupied by the dielectric filter 100 when installed on the mounting board may be understood as the on-board area of ​​the dielectric filter 100 .

[0089] Compared with the scheme of opening a resonant blind hole and a coupling blind hole on the upper surface of a dielectric entity in the related art to realize negative coupling between two resonators, the embodiment of the present application opens the first resonant blind hole 121 and the second resonant blind hole 122 on the side of the dielectric entity 110, and opens the first coupling through hole 140 and the second coupling through hole 141 on the top surface 113 of the dielectric entity 110 to realize negative coupling between the first resonator 123 and the second resonator 124. When the projection area of ​​the dielectric entity 110 in the height direction (that is, the direction from the upper surface to the lower surface of the dielectric entity) is reduced, the projection area of ​​the dielectric entity 110 in the axial direction of the resonant blind hole (the first resonant blind hole 121 and the second resonant blind hole 122) will not be affected. In this way, the on-board area of ​​the dielectric filter 100 can be reduced by reducing the projection area of ​​the dielectric entity 110 in the height direction, and the on-board area of ​​the dielectric filter 100 is reduced without reducing the Q value of the single cavity of the resonator, thereby effectively realizing the miniaturization design of the dielectric filter 100.

[0090] Moreover, compared with the dielectric filter in the related art, the resonant blind holes (the first resonant blind hole 121 and the second resonant blind hole 122) of the dielectric filter 100 provided in the embodiment of the present application are both arranged on the two sides of the dielectric entity 110, which can reduce the crosstalk between the resonators. Figure 1 The first coupling blind hole 14) is designed in this way, which can effectively improve the far-end suppression capability of the dielectric filter 100 and the out-of-band suppression effect. There is no need to set a low-pass wiring, which can avoid the insertion loss caused by the low-pass wiring, thereby effectively reducing the loss of the dielectric filter.

[0091] Continue to see Figure 5 and Figure 6 As shown, the dielectric entity 110 may further include a second group of resonant blind holes 130, and the second group of resonant blind holes 130 may include a third resonant blind hole 131 and a fourth resonant blind hole 132. The third resonant blind hole 131 and the dielectric entity 110 around it may form a third resonator 133, and the fourth resonant blind hole 132 and the dielectric entity 110 around it may form a fourth resonator 134.

[0092] A third coupling through hole 143 may also be provided on the top surface 113 of the dielectric entity 110, and two second connection portions 144 are provided on both sides of the third coupling through hole 143, so that positive coupling can be achieved between the third resonator 133 and the fourth resonator 134 through the two second connection portions 144. Positive coupling is also called magnetic coupling, which means that the third resonator 133 and the fourth resonator 134 are mainly coupled by the magnetic field during the coupling process.

[0093] For example, the third coupling through hole 143 may be opened at a position close to the center of the third resonator 133 and the fourth resonator 134 to remove the dielectric entity 110 material at the center between the third resonator 133 and the fourth resonator 134, and retain the dielectric entity 110 near the two sides between the third resonator 133 and the fourth resonator 134 to form two second connecting parts 144, and the third resonator 133 and the fourth resonator 134 may be connected through the dielectric entity 110 material corresponding to the two second connecting parts 144. In this way, the electromagnetic wave signal can be propagated from the third resonator 133 to the fourth resonator 134 through the two second connecting parts 144 near the two sides, so as to achieve positive coupling between the third resonator 133 and the fourth resonator 134.

[0094] Among them, the size of the second connecting portion 144 can affect the size of the coupling channel (also called window) between the third resonator 133 and the fourth resonator 134. The larger the cross-sectional area of ​​the second connecting portion 144 in the direction from the third resonator 133 to the fourth resonator 134, the larger the coupling channel between the third resonator 133 and the fourth resonator 134. At this time, the coupling amount between the third resonator 133 and the fourth resonator 134 is greater.

[0095] On the contrary, the smaller the cross-sectional area of ​​the second connection portion 144 in the direction from the third resonator 133 to the fourth resonator 134, the smaller the coupling channel between the third resonator 133 and the fourth resonator 134. At this time, the coupling amount between the third resonator 133 and the fourth resonator 134 is also smaller. Therefore, the size of the second connection portion 144 can be changed by changing the size of the third coupling through hole 143, for example, by changing the cross-sectional area of ​​the third coupling through hole 143 in the direction from the third resonator 133 to the fourth resonator 134, thereby changing the coupling amount between the third resonator 133 and the fourth resonator 134.

[0096] Continue to see Figure 5As shown, in a possible implementation, a first coupling slot 145 may be further provided on the dielectric entity 110, and the first coupling through hole 140 and the second coupling through hole 141 may both be provided on the bottom wall of the first coupling slot 145. The first coupling slot 145 may remove the material of the dielectric entity 110 at the position of the first connecting portion 142 close to the top surface 113 of the dielectric entity 110, so as to further reduce the size of the first connecting portion 142, thereby adjusting the size of the coupling channel between the first resonator 123 and the second resonator 124, and thus changing the coupling amount between the first resonator 123 and the second resonator 124.

[0097] For example, when the size of the first coupling slot 145 in the direction from the top surface 113 to the bottom surface of the dielectric entity 110 is large, that is, the depth of the first coupling slot 145 is deep, at this time, the cross-sectional area of ​​the first coupling slot 145 in the direction from the third resonator 133 to the fourth resonator 134 is also relatively large, so that the cross-sectional area of ​​the first connecting portion 142 in the direction from the first resonator 123 to the second resonator 124 is small, which can reduce the coupling amount between the first resonator 123 and the second resonator 124.

[0098] On the contrary, when the size of the first coupling slot 145 in the direction from the top surface 113 to the bottom surface of the dielectric entity 110 is small, that is, the depth of the first coupling slot 145 is small, at this time, the cross-sectional area of ​​the first coupling slot 145 in the direction from the first resonator 123 to the second resonator 124 is also relatively small, so that the cross-sectional area of ​​the first connecting portion 142 in the direction from the first resonator 123 to the second resonator 124 is larger, which can increase the coupling amount between the first resonator 123 and the first resonator 123.

[0099] Continue to see Figure 5 As shown, in another possible implementation, a second coupling groove 146 may be further provided on the top surface 113 of the dielectric entity 110, and the third coupling through hole 143 may be provided on the bottom wall of the second coupling groove 146. The second coupling groove 146 may remove the dielectric entity 110 material at the position of the second connecting portion 144 close to the top surface 113 of the dielectric entity 110, so as to further reduce the size of the second connecting portion 144, and adjust the size of the coupling channel between the third resonator 133 and the fourth resonator 134, thereby changing the coupling amount between the third resonator 133 and the fourth resonator 134, so as to achieve more forms of coupling amounts between the third resonator 133 and the fourth resonator 134.

[0100] For example, when the size of the second coupling slot 146 in the direction from the top surface 113 to the bottom surface of the dielectric entity 110 is large, that is, the depth of the second coupling slot 146 is deep, at this time, the cross-sectional area of ​​the second coupling slot 146 in the direction from the third resonator 133 to the fourth resonator 134 is also relatively large, so that the cross-sectional area of ​​the second connecting portion 144 in the direction from the third resonator 133 to the fourth resonator 134 is smaller, which can reduce the coupling amount between the third resonator 133 and the fourth resonator 134.

[0101] On the contrary, when the size of the second coupling slot 146 in the direction from the top surface 113 to the bottom surface of the dielectric entity 110 is small, that is, the depth of the second coupling slot 146 is small, at this time, the cross-sectional area of ​​the second coupling slot 146 in the direction from the third resonator 133 to the fourth resonator 134 is also relatively small, so that the cross-sectional area of ​​the second connecting portion 144 in the direction from the third resonator 133 to the fourth resonator 134 is larger, which can increase the coupling amount between the third resonator 133 and the fourth resonator 134.

[0102] Or, in yet another possible implementation, see Figure 5 and Figure 6 As shown, a third coupling slot 147 may be further provided on the top surface 113 of the dielectric entity 110, and the first coupling through hole 140, the second coupling through hole 141 and the third coupling through hole 143 may all be provided on the bottom wall of the third coupling slot 147. At this time, it may also be understood that the first coupling slot 145 and the second coupling slot 146 are connected, for example, the third coupling slot 147 may pass through from one end to the other end of the dielectric entity 110, and then the first coupling through hole 140, the second coupling through hole 141 and the third coupling through hole 143 are respectively provided on the bottom wall of the third coupling slot 147.

[0103] Continue to see Figure 5 and Figure 6 As shown, in some examples, a fifth coupling through hole 151 may be provided on the top surface 113 of the dielectric entity, and the fifth coupling through hole 151 may be located between two adjacent groups of resonant blind holes. For example, in the embodiment of the present application, the fifth coupling through hole 151 may be provided between the adjacent first group of resonant blind holes 120 and the second group of resonant blind holes 130. The fifth coupling through hole 151 may further adjust the coupling channel size between the first resonator 123 and the third resonator 133 and the second resonator 124 and the fourth resonator 134, so that coupling of different coupling amounts can be achieved between two adjacent resonators.

[0104] For example, taking the coupling between the first resonator 123 and the third resonator 133 as an example, the fifth coupling through hole 151 may be as follows: Figure 5In the elongated through hole shown in the figure, at this time, the cross-sectional area of ​​the fifth coupling through hole 151 in the direction from the first resonator 123 to the third resonator 133 is relatively large, which can make the coupling channel between the first resonator 123 and the third resonator 133 relatively small, and can further reduce the coupling amount between the first resonator 123 and the third resonator 133.

[0105] Alternatively, the fifth coupling through hole 151 may also be a cylindrical through hole. In this case, the cross-sectional area of ​​the fifth coupling through hole 151 in the direction from the first resonator 123 to the third resonator 133 is relatively small, so that the coupling channel between the first resonator 123 and the third resonator 133 can be relatively large, and a relatively large coupling amount can be achieved between the first resonator 123 and the third resonator 133.

[0106] In the embodiment of the present application, the number of the first group of resonant blind holes 120 and the second group of resonant blind holes 130 may be multiple, and the multiple first group of resonant blind holes 120 and the multiple second group of resonant blind holes 130 may be arranged alternately. Figure 6 As shown, the number of the first group of resonant blind holes 120 may be two, and the number of the second group of resonant blind holes 130 may be three, wherein there may be one first group of resonant blind holes 120 between every two second group of resonant blind holes 130 .

[0107] The arrangement of the first group of resonant blind holes 120 and the second group of resonant blind holes 130 can affect the filtering result of the dielectric filter 100. For example, when the first group of resonant blind holes 120 and the second group of resonant blind holes 130 are arranged in an alternating manner, the dielectric filter 100 can obtain signals in a certain frequency band and filter out other signals outside the frequency band. When the first group of resonant blind holes 120 and the second group of resonant blind holes 130 are arranged in other ways, for example, the dielectric filter 100 can obtain signals in another frequency band and filter out signals outside the frequency band.

[0108] For example, in some examples, a plurality of first group resonant blind holes 120 may be arranged adjacent to each other in sequence, and then a plurality of second group resonant blind holes 130 may be arranged in sequence. Specifically, the arrangement of the first group resonant blind holes 120 and the second group resonant blind holes 130 may be selected and set according to the filtering requirements of the dielectric filter 100. In the embodiment of the present application, the staggered arrangement of the first group resonant blind holes 120 and the second group resonant blind holes 130 is taken as an example for description.

[0109] Figure 7 A schematic diagram of the structure of another dielectric filter provided in an embodiment of the present application, Figure 8 A top view of another dielectric filter provided in an embodiment of the present application.

[0110] Or, in some examples, see Figure 7 and Figure 8 As shown, a fourth coupling slot 148 may be further provided on the top surface 113 of the dielectric entity 110, and the first coupling through hole 140 and the third coupling through hole 143 may be provided on the bottom wall of the fourth coupling slot 148. For example, the first group of resonators (i.e., the resonators formed by the first group of resonant blind holes 120) and the second group of resonators (i.e., the resonators formed by the second group of resonant blind holes 130) may be arranged adjacent to each other. In this case, the fourth coupling slot 148 may be provided on the top surface 113 of the dielectric entity 110, and the fourth coupling slot 148 may extend from the first group of resonators to the position where the first coupling through hole 140 is provided in the second group of resonators, and then the first coupling through hole 140 and the third coupling through hole 143 may be provided on the bottom wall of the fourth coupling slot 148.

[0111] Continue to see Figure 7 and Figure 8 As shown, a fourth coupling through hole 149 may be further provided on the dielectric entity 110 . The fourth coupling through hole 149 may be located on the first side surface 111 or the second side surface 112 of the dielectric entity 110 , and the fourth coupling through hole 149 may be located between two adjacent groups of resonant blind holes.

[0112] For example, in the embodiment of the present application, the fourth coupling through hole 149 can be opened between the adjacent first group of resonant blind holes 120 and the second group of resonant blind holes 130. Among them, the resonators formed by two adjacent resonant blind holes located on the same side can also be coupled, for example, the first resonator 123 formed by the first resonant blind hole 121 and the third resonator 133 formed by the third resonant blind hole 131 can also be coupled. Correspondingly, the second resonator 124 and the fourth resonator 134 can also be coupled. The fourth coupling through hole 149 can adjust the size of the coupling channel between the first resonator 123 and the third resonator 133 or the second resonator 124 and the fourth resonator 134.

[0113] For example, when the fourth coupling through hole 149 is located at the first side 111 of the dielectric entity 110, the fourth coupling through hole 149 can adjust the size of the coupling channel between the first resonator 123 and the third resonator 133. When the fourth coupling through hole 149 is located at the second side 112 of the dielectric entity 110, the fourth coupling through hole 149 can adjust the size of the coupling channel between the second resonator 124 and the fourth resonator 134.

[0114] For example, taking the coupling between the first resonator 123 and the third resonator 133 as an example, the fourth coupling through hole 149 may be a cylindrical through hole, and the cross-sectional area of ​​the fourth coupling through hole 149 in the direction from the first resonator 123 to the third resonator 133 is relatively small. In this case, the coupling channel between the first resonator 123 and the third resonator 133 is relatively large, so that a larger coupling amount can be achieved between the first resonator 123 and the third resonator 133. Alternatively, the fourth coupling through hole 149 may also be an elongated through hole, and the cross-sectional area of ​​the fourth coupling through hole 149 in the direction from the first resonator 123 to the third resonator 133 is relatively large. In this case, the coupling channel between the first resonator 123 and the third resonator 133 is relatively small, so that a smaller coupling amount can be achieved between the first resonator 123 and the third resonator 133.

[0115] In a specific application process, the cross-sectional shape and size of the fourth coupling through hole 149 may be designed according to the coupling amount requirement between the first resonator 123 and the third resonator 133 .

[0116] Correspondingly, the fourth coupling through hole 149 also has the same function of controlling the coupling amount between the second resonator 124 and the fourth resonator 134 , which will not be described in detail herein.

[0117] The fourth coupling through hole 149 on the first side surface 111 and the fourth coupling through hole 149 on the second side surface 112 may be coaxially arranged, or the fourth coupling through hole 149 on the first side surface 111 and the fourth coupling through hole 149 on the second side surface 112 may be staggered. Specifically, the arrangement positions of the fourth coupling through hole 149 on the first side surface 111 and the fourth coupling through hole 149 on the second side surface 112 may be selected and set according to specific application requirements.

[0118] Alternatively, in some examples, a fifth coupling slot 150 may be provided on the top surface 113 of the dielectric entity 110 (see Figure 3 and Figure 4 ), the fifth coupling slot 150 may extend from the first side surface 111 of the dielectric entity 110 to the second side surface 112, and the fifth coupling slot 150 may be located between two adjacent groups of resonant blind holes. For example, in the embodiment of the present application, the fifth coupling slot 150 may be provided between the adjacent first group of resonant blind holes 120 and the second group of resonant blind holes 130. The fifth coupling slot 150 may also adjust the size of the coupling channel between the first resonator 123 and the third resonator 133 and the second resonator 124 and the fourth resonator 134, so that coupling of different coupling amounts can be achieved between two adjacent resonators.

[0119] Among them, continuing to take the coupling between the first resonator 123 and the third resonator 133 as an example, the greater the depth of the fifth coupling slot 150, the larger its cross-sectional area in the direction from the first resonator 123 to the third resonator 133, the smaller the coupling channel between the first resonator 123 and the third resonator 133, and the smaller the coupling amount between the first resonator 123 and the third resonator 133. On the contrary, the smaller the depth of the fifth coupling slot 150, the smaller its cross-sectional area in the direction from the first resonator 123 to the third resonator 133, the larger the coupling channel between the first resonator 123 and the third resonator 133, and the smaller the coupling amount between the first resonator 123 and the third resonator 133. In a specific application process, the depth dimension of the fifth coupling slot 150 can be designed according to the coupling amount requirement between the first resonator 123 and the third resonator 133.

[0120] In the embodiment of the present application, the first resonant blind hole 121 and the second resonant blind hole 122 in the first group of resonant blind holes 120 can be coaxially arranged, and the third resonant blind hole 131 and the fourth resonant blind hole 132 in the second group of resonant blind holes 130 can also be coaxially arranged. In this way, the regularity of the overall structure of the dielectric filter 100 can be improved, and the design and production of the dielectric filter 100 can be facilitated. Moreover, when performing simulation calculations on the dielectric filter 100, the size of each resonant blind hole in the dielectric filter 100 can be conveniently determined, thereby improving the operating efficiency.

[0121] Fig. 9 A structural schematic diagram of a signal input terminal arrangement provided in an embodiment of the present application.

[0122] In the examples of this application, see Fig. 9 As shown, the dielectric filter 100 may further include a signal input terminal 160, and the signal input terminal 160 may be connected to the first resonator 123 for signal connection. The electromagnetic wave signal may be input from the signal input terminal 160 and enter the dielectric filter 100 through the first resonator 123.

[0123] For example, see Fig. 9 As shown, a first coupling blind hole 161 may be further provided on the dielectric entity 110, one end of the first coupling blind hole 161 may be connected to the signal input end 160, and the other end of the first coupling blind hole 161 may be connected to the first resonant blind hole 121, and the signal input end 160 may be coupled and fed to the first resonator 123 through the first coupling blind hole 161, so that the electromagnetic wave signal may be fed into the dielectric filter 100.

[0124] Of course, in some examples, the signal input terminal 160 may also be connected to the second resonator 124 , the third resonator 133 , or the fourth resonator 134 for signal connection to implement the input of electromagnetic wave signals.

[0125] Continue to see Fig. 9 As shown, a sixth coupling slot 162 may be further provided on the dielectric entity 110, one end of the sixth coupling slot 162 may be connected to the other end of the first coupling blind hole 161, and the other end of the sixth coupling slot 162 may be connected to the first resonant blind hole 121. The signal input end 160 may be fed and coupled with the first resonator 123 through the first coupling blind hole 161 and the sixth coupling slot 162 in sequence to realize signal input.

[0126] Correspondingly, the dielectric filter 100 may also include a signal output end (not shown in the figure), which can be connected to the second resonator 124 for signal connection. After the electromagnetic wave signal is fed into the dielectric filter 100 from the signal input end 160, it can be repeatedly reflected in the dielectric entity 110 and finally output from the signal output end to complete the filtering function of the dielectric filter 100.

[0127] The signal connection between the signal output terminal and the second resonator may be set with reference to the connection between the signal input terminal 160 and the first resonator 123 , which will not be described in detail here.

[0128] Alternatively, in some examples, the signal output end may also be connected to the second resonator 124 , the third resonator 133 , or the fourth resonator 134 for signal connection to achieve output of electromagnetic wave signals.

[0129] An embodiment of the present application also provides a communication device, which may include the dielectric filter 100 in any of the above examples. For example, the communication device may be a communication base station, satellite communication, navigation system, etc. The dielectric filter 100 can filter out interference signals in the communication device to improve the signal stability and reliability of the operation of the communication device.

[0130] By making the communication device include the above-mentioned dielectric filter 100, the installation space occupied by the dielectric filter 100 in the communication device can be effectively reduced, which is conducive to improving the rationality and regularity of the internal device layout of the communication device.

[0131] For example, the communication device may further include an antenna, and the antenna may be signal-connected to the dielectric filter 100. The antenna may be used to transmit and receive signals, and the dielectric filter 100 may be used to filter the signals received by the antenna or to send the filtered signals to the antenna.

[0132] In conjunction with the accompanying drawings, a simulation test is performed on the dielectric filter 100 provided in the embodiment of the present application.

[0133] Fig.10 is a signal echo efficiency diagram of a dielectric filter in the related art, Fig.11A signal echo efficiency diagram of a dielectric filter provided in an embodiment of the present application.

[0134] See also Fig.10 As shown in the figure, the horizontal axis is frequency, and the vertical axis is signal power. The farther the vertical axis value of the curve in the figure is from 0, the less the signal from the input end to the output end, that is, the signal of this frequency is filtered out by the dielectric filter 100 and is not output from the signal output end. On the contrary, the closer the vertical axis value of the curve in the figure is to 0, the more the signal from the input end to the output end is, indicating that the signal of this frequency passes through the dielectric filter 100 and is output from the output end of the dielectric filter 100.

[0135] Therefore, from Fig.10 It can be concluded that the dielectric filter 100 in the related art has a resonance point at a center frequency of 3.5 GHz, and the signal in this frequency band passes through the dielectric filter 100. Fig.10 It can also be seen that two low-frequency resonance points appear near the frequency of 2.5 GHz, where the signal echo is less and a part of the energy passes through the dielectric filter 100, indicating that the signal suppression effect of the dielectric filter 100 at this frequency is poor.

[0136] In addition, in the frequency band of 6.0 GHz to 6.5 GHz, the dielectric filter 100 has a high-order mode resonance, that is, there is an out-of-band resonance mode, which means that the dielectric filter 100 resonates outside the passband. High-order mode resonance refers to an out-of-band resonance mode with a resonance frequency near twice or several times the passband, which will produce a parasitic passband near twice or several times the passband, causing the suppression effect near twice or several times the passband of the filter to deteriorate. Therefore, it can be concluded from the figure that the dielectric filter 100 in the related art has a poor suppression effect on high-order mode signals.

[0137] Generally, in the related art, in order to solve the problem of high-order mode resonance, during the use of the dielectric filter 100, it is necessary to add a branch line of a low-pass routing to the dielectric filter 100 to suppress the high-order mode signal, which has a large insertion loss and increases the loss of the dielectric filter. Moreover, it occupies the overall layout area and cost of the dielectric filter.

[0138] See also Fig.11 As shown, Fig.11 The signal echo efficiency diagram of the dielectric filter 100 provided in the embodiment of the present application is shown in FIG. Fig.11 It can be seen from the figure that there is a resonance point at a center frequency of 3.5 GHz, and the signal in this frequency band passes through the dielectric filter 100. Fig.10In this way, the dielectric filter 100 does not need to set low-pass wiring branches during use, which can avoid the insertion loss problem caused by adding low-pass wiring, and effectively reduce the loss and cost of the dielectric filter 100.

[0139] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, or it can be an indirect connection through an intermediate medium, it can be the internal connection of two components or the interaction relationship between two components. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances. The terms "first", "second", "third", "fourth", etc. (if any) are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0140] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the embodiments of the present application, rather than to limit them. Although the embodiments of the present application have been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A dielectric filter, characterized in that: The dielectric body comprises a dielectric body having a first side surface and a second side surface opposite to each other and a top surface between the first side surface and the second side surface; At least one group of resonant blind holes is formed on the dielectric entity, wherein the at least one group of resonant blind holes comprises a first group of resonant blind holes, and the first group of resonant blind holes comprises a first resonant blind hole and a second resonant blind hole; The first resonant blind hole is located on the first side surface, and the second resonant blind hole is located on the second side surface; The first resonant blind hole and the dielectric entity on its periphery form a first resonator, and the second resonant blind hole and the dielectric entity on its periphery form a second resonator; A first coupling through hole and a second coupling through hole are provided on the top surface of the dielectric entity, a first connecting portion is provided between the first coupling through hole and the second coupling through hole, and the first resonator and the second resonator are negatively coupled via the first connecting portion.

2. The dielectric filter according to claim 1, characterized in that: The at least one group of resonant blind holes further comprises a second group of resonant blind holes, wherein the second group of resonant blind holes comprises a third resonant blind hole and a fourth resonant blind hole; The third resonant blind hole is located on the first side surface, and the fourth resonant blind hole is located on the second side surface; The third resonant blind hole and the dielectric entity on its periphery form a third resonator, and the fourth resonant blind hole and the dielectric entity on its periphery form a fourth resonator; A third coupling through hole is provided on the top surface of the dielectric entity, and two second connecting portions are provided on both sides of the third coupling through hole. The third resonator and the fourth resonator are positively coupled via the two second connecting portions.

3. The dielectric filter according to claim 2, characterized in that: A first coupling groove is also provided on the top surface of the dielectric entity, and the first coupling through hole and the second coupling through hole are both provided on the bottom wall of the first coupling groove.

4. The dielectric filter according to claim 2 or 3, characterized in that: A second coupling groove is also provided on the top surface of the dielectric entity, and the third coupling through hole is provided on the bottom wall of the second coupling groove.

5. The dielectric filter according to any one of claims 2 to 4, characterized in that: A third coupling slot is also provided on the top surface of the dielectric entity, and the first coupling through hole, the second coupling through hole and the third coupling through hole are all provided on the bottom wall of the third coupling slot.

6. The dielectric filter according to any one of claims 2 to 5, characterized in that: A fourth coupling slot is also provided on the top surface of the dielectric entity, and the first coupling through hole and the third coupling through hole are both provided on the bottom wall of the fourth coupling slot.

7. The dielectric filter according to any one of claims 2 to 6, characterized in that: The dielectric entity is also provided with a fourth coupling through hole; The fourth coupling through hole is located on the first side surface or the second side surface of the dielectric entity, and the fourth coupling through hole is located between two adjacent groups of resonant blind holes.

8. The dielectric filter according to any one of claims 2 to 6, characterized in that: A fifth coupling groove is also provided on the top surface of the dielectric entity; The fifth coupling slot runs through from the first side surface of the dielectric entity to the second side surface, and the fifth coupling through hole is located between two adjacent groups of resonant blind holes.

9. The dielectric filter according to any one of claims 2 to 6, characterized in that: A fifth coupling through hole is also provided on the top surface of the dielectric entity; The fifth coupling through hole is located between two adjacent groups of resonant blind holes.

10. The dielectric filter according to any one of claims 2 to 9, characterized in that: The number of the first group of resonant blind holes and the second group of resonant blind holes is multiple; A plurality of the first group of resonant blind holes and a plurality of the second group of resonant blind holes are arranged alternately.

11. The dielectric filter according to any one of claims 2 to 10, characterized in that: The first resonant blind hole and the second resonant blind hole in the first group of resonant blind holes are coaxially arranged; The third resonant blind hole and the fourth resonant blind hole in the second group of resonant blind holes are coaxially arranged.

12. The dielectric filter according to any one of claims 1 to 11, characterized in that: The dielectric filter further comprises a conductive layer, and the conductive layer covers the surface of the dielectric entity.

13. The dielectric filter according to any one of claims 1 to 12, characterized in that: The dielectric filter also includes a signal input terminal; The signal input terminal is signal-connected to the first resonator.

14. The dielectric filter according to claim 13, characterized in that: The dielectric entity is also provided with a first coupling blind hole; One end of the first coupling blind hole is connected to the signal input end, and the other end of the first coupling blind hole is connected to the first resonance blind hole.

15. The dielectric filter according to claim 14, characterized in that: The dielectric entity is also provided with a sixth coupling slot; One end of the sixth coupling slot is communicated with the other end of the first coupling blind hole, and the other end of the sixth coupling slot is communicated with the first resonant blind hole.

16. The dielectric filter according to any one of claims 1 to 15, characterized in that: The dielectric filter also includes a signal output terminal; The signal input terminal is signal-connected to the second resonator.

17. A communication device, characterized in that: Comprising the dielectric filter according to any one of claims 1 to 16.

18. The communication device according to claim 17, characterized in that: The communication device further comprises an antenna, and the antenna is signal-connected to the dielectric filter.

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