Filter, module assembly, and ceramic dielectric module

Abstract

The present invention provides a filter, a module assembly and a ceramic dielectric module. The ceramic dielectric module is used to tune a multimode signal passing therethrough. It includes a module in a block shape with a conductive metal layer covering its surface. The module is provided with an open slot for realizing the coupling between the modes of the signal. Each open slot is located at a non-terminal position of a corresponding edge of the module. The open slot occupies a block space and is symmetrically arranged on both sides of the edge where it is located with respect to the edge. The filter and the module assembly are both formed by connecting and combining a plurality of the ceramic dielectric modules. By arranging the open slots at non-terminal positions of the edges of the ceramic dielectric module, the present invention optimizes the tuning effect of the module, optimizes the ratio relationship of the length, width and height of the module, and is superior to the prior art.

Description

Technical Field

[0001] The present invention relates to the field of communication technology, and in particular to a ceramic dielectric module, a module assembly formed by combining the ceramic dielectric modules into a composite unit, and a filter assembled using the ceramic dielectric modules. Background Art

[0002] As a frequency-selective device, the filter is composed of multiple resonant modules, among which the ceramic dielectric filter is realized by using a ceramic dielectric module. As a basic tuning unit, the ceramic dielectric module is an indispensable part of communication equipment. With the rapid development of communication systems entering the 5G era, the reliability of the filter is a factor that affects the system relationship. How to reduce the size of the filter while reducing the insertion loss of the product is a difficult problem that needs to be solved urgently in the industry.

[0003] Most of the existing dielectric filters are single-mode filters, which are relatively large in size and have no advantages in insertion loss.

[0004] In order to achieve a balance between volume and insertion loss, multi-mode filters have been developed. Among multi-mode filters, dual-mode and triple-mode are more mature. Figure 1 As shown, when the length L, width W, and height H of the module used in the filter are almost equal, the three modes of the filter can be almost equivalent, meeting the higher design requirements of the module.

[0005] In order to realize the cross coupling of the three modes of the ceramic dielectric module, in the prior art, the coupling can be realized by opening a cut between two adjacent surfaces, such as Figure 2 The "I"-shaped cutout A and Figure 3 The "L" shaped cutout B shown. However, these cutouts are difficult to achieve strong coupling and the coupling bandwidth is very narrow. In addition, the module designed in this way is larger in size and has a larger difference between length, width and height. Figure 3 The figure shows a module used for a 180M bandwidth filter. To achieve a filtering bandwidth of 180M, the length, width and height of the filter are 13.88mm, 13.89mm and 15.21mm respectively. The height is obviously larger than the length and width, which cannot meet the design goal of equal sizes of the three modes.

[0006] It can be seen that the filter constructed by the traditional cutting method is large in size and complex in structure, and it is difficult to further achieve a wider passband effect. Summary of the invention

[0007] The object of the present invention is to provide a ceramic dielectric module for realizing coupling among multiple modes.

[0008] Another object of the present invention is to provide a module assembly / filter using the ceramic dielectric module described in the previous object.

[0009] To achieve the above objectives, the present invention provides the following technical solutions:

[0010] A ceramic dielectric module is provided to meet one of the purposes of the present invention, which is used to tune the multi-mode signal passing through it. It is in the shape of a square and its surface is covered with a conductive metal layer. The module is provided with open slots for realizing coupling between the modes of the signal. Each open slot is located at a non-end position of one of the corresponding edges of the module. The open slots occupy a block space and are symmetrically arranged about the edge on both sides of the edge where they are located.

[0011] In some embodiments, the module is provided with at least two of the open slots, and the edges of the open slots are respectively parallel to different virtual coordinate axes with reference to a three-dimensional Cartesian coordinate system.

[0012] In a further embodiment, the module is provided with two open slots, wherein the first open slot is used to achieve coupling of the first mode and the second mode in the multimode signal, and the second open slot is used to achieve coupling of the first mode and the third mode in the multimode signal.

[0013] In a further embodiment, the module is further provided with a third opening slot for achieving coupling between the second mode and the third mode.

[0014] In some embodiments, the width of one of the opening slots on its edge is greater than the widths of the remaining opening slots on their respective edges.

[0015] In some embodiments, one of the open slots is used to participate in implementing capacitive cross-coupling / inductive cross-coupling between two modes of the multi-mode signal.

[0016] In some embodiments, at least one tuning hole is provided on the surface of the module.

[0017] In a further embodiment, the module is provided with a signal connection port on its surface, and the signal connection port is a signal input port and / or a signal output port.

[0018] In some embodiments, the module has a window on one side thereof for coupling a signal with the second ceramic dielectric module.

[0019] In a preferred embodiment, a conductive metal layer is plated on the surface of the open groove.

[0020] In a further embodiment, the conductive metal layer of the ceramic dielectric module has a plurality of partially removed hollow areas.

[0021] A module assembly / filter is provided to meet one of the purposes of the present invention, which includes a plurality of ceramic dielectric modules as described above, wherein the ceramic dielectric modules are sequentially connected to each other through windows to achieve mutual coupling, and the ceramic dielectric modules at the first and last stages of the sequence are respectively provided with signal connection ports.

[0022] In a further embodiment, in two of the ceramic dielectric modules connected in sequence, each of the three modes in one ceramic dielectric module is coupled to a different one of the three modes in the other ceramic dielectric module through an open slot in the ceramic dielectric module.

[0023] In a preferred embodiment, at the window, inductive cross-coupling and / or capacitive cross-coupling is generated between the two modes through a magnetic field.

[0024] In one embodiment, the filter comprises two ceramic dielectric modules, wherein the first ceramic dielectric module is provided with two open slots, and the second ceramic dielectric module is provided with three open slots.

[0025] In a preferred embodiment, the windows of two sequential ceramic dielectric modules are connected by any one of air, dielectric material and waveguide.

[0026] The beneficial effects brought by the technical solution provided by the present invention are:

[0027] The present invention improves the ceramic dielectric module to meet the needs of two-to-two coupling in multiple modes. Open slots are set at non-end positions of corresponding edges of the ceramic dielectric module, and each open slot is used to achieve coupling between two modes with orthogonal polarizations. The open slots set at non-end positions of the edges are conducive to reducing the insertion loss of the module access and the path, and can achieve a wider passband. In addition, the ceramic dielectric module of the present invention can reduce the size of the filter while achieving the same broadband, making the length, width and height of the filter closer to equal, and better meeting the design requirements of high-performance filters. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for describing the embodiments of the present invention are briefly introduced below.

[0029] Figure 1 It is a schematic diagram of the structure of a traditional filter;

[0030] Figure 2 The schematic diagram of the structure of a conventional ceramic dielectric module with a cutout structure, wherein the size of one spatial dimension is significantly larger than the other two spatial dimensions, and a single cutout is used that runs through the entire edge;

[0031] Figure 3It is a schematic diagram of the structure of a conventional ceramic dielectric module with a cutout structure, wherein the size of one spatial dimension is significantly larger than the other two spatial dimensions, and wherein two cutouts are used that run through the entire edge and intersect with each other;

[0032] Figure 4 A schematic diagram of the relative position of the ceramic dielectric module provided by the present invention on a three-dimensional Cartesian coordinate system;

[0033] Figure 5 A structural principle diagram of an embodiment of the ceramic dielectric module provided by the present invention, mainly showing the situation of a single open slot;

[0034] Figure 6 A structural principle diagram of another embodiment of the ceramic dielectric module provided by the present invention mainly shows the situation of two open slots and the situation of setting two signal connection ports;

[0035] Figure 7 A schematic diagram of the relationship between the arrangement of the open slots in one embodiment of the ceramic dielectric module provided by the present invention for realizing capacitive cross coupling;

[0036] Figure 8 A schematic diagram of the relationship between the arrangement of the open slots in one embodiment of the ceramic dielectric module provided by the present invention for realizing capacitive cross coupling;

[0037] Fig. 9 A schematic diagram of the relationship between the arrangement of the open slots in one embodiment of the ceramic dielectric module provided by the present invention for realizing capacitive cross coupling;

[0038] Fig.10 A schematic diagram of the relationship between the arrangement of the open slots in one embodiment of the ceramic dielectric module provided by the present invention for realizing capacitive cross coupling;

[0039] Fig.11 A schematic diagram of a parameter curve embodied by the ceramic dielectric module provided by the present invention realizing capacitive cross-coupling to generate symmetrical zero points;

[0040] Fig.12 A schematic diagram of the relationship between the arrangement of the open slots in an embodiment of the ceramic dielectric module provided by the present invention for realizing inductive coupling;

[0041] Fig.13 A schematic diagram of the relationship between the arrangement of the open slots in an embodiment of the ceramic dielectric module provided by the present invention for realizing inductive coupling;

[0042] Fig.14 A schematic diagram of the relationship between the arrangement of the open slots in an embodiment of the ceramic dielectric module provided by the present invention for realizing inductive coupling;

[0043] Fig.15A schematic diagram of the relationship between the arrangement of the open slots in an embodiment of the ceramic dielectric module provided by the present invention for realizing inductive coupling;

[0044] Fig.16 A schematic diagram of a parameter curve embodied by the ceramic dielectric module provided by the present invention to achieve inductive coupling and generate symmetrical zero points;

[0045] Fig.17 A schematic diagram of the structure of an embodiment of the filter provided by the present invention, showing one viewing angle thereof;

[0046] Fig.18 for Fig.17 A schematic diagram of the structure of the filter shown in another perspective. DETAILED DESCRIPTION

[0047] Embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although certain embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be construed as being limited to the embodiments described herein, which are instead provided for a more thorough and complete understanding of the present invention. It should be understood that the drawings and embodiments of the present invention are only for exemplary purposes and are not intended to limit the scope of protection of the present invention.

[0048] The term "including" and its variations used herein are open inclusions, i.e., "including but not limited to". The term "connected" may be directly connected or indirectly connected through intermediate components (elements). The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one other embodiment"; the term "some embodiments" means "at least some embodiments". The relevant definitions of other terms will be given in the following description.

[0049] To understand the relative positional relationship involved in the following description, please refer to Figure 4 The figure shows the positional relationship of each face and edge of a block-shaped object M placed in a three-dimensional Cartesian coordinate system relative to each coordinate axis. According to the figure, it can be understood that when the block-shaped object is regularly placed in such a coordinate system, each face is parallel to the face formed by two adjacent coordinate axes, and the four edges formed by each of the four consecutive faces of the block-shaped object are parallel to one of the coordinate axes. Among the twelve edges formed by the six faces of the block-shaped object, four edges are parallel to one of the three axes X, Y, and Z. Based on such relative positional relationship, the various components described below that involve the block-shaped structure are marked with the symbol M so that they can be combined with Figure 4 To understand.

[0050] See also Figure 5As a typical embodiment of the ceramic dielectric module provided by the present invention, it is processed from a regular square ceramic dielectric, and the entire surface is plated with a metal conductive layer, generally a metal silver layer. The module M has approximately equal length, width and height, and an open slot 11 is set on one of its edges, which can be used to couple the two polarization orthogonal modes of the signal passing therethrough. In this embodiment, the open slot 11 is also plated with a metal conductive layer.

[0051] The opening slot 11 is also block-shaped and located at a non-end position of the edge where it is located. A preferred embodiment is to set it in the middle of one edge. Its specific position and specific size can be flexibly designed by technicians in this field according to the specific performance required by the module.

[0052] It should be noted that the opening groove 11 of the present invention is not allowed to be set at the end position of an edge to become a half-edge or full-edge cut in the prior art. Therefore, the opening groove 11 of the present invention should be a groove surrounded by a ceramic medium, rather than a semi-open or fully open cut.

[0053] The opening groove 11 occupies a block-shaped space, straddling the two adjacent surfaces constituting the edge where the opening groove 11 is located, and is symmetrically distributed on the two adjacent surfaces, so that the two surfaces are notched at the position of the opening groove 11.

[0054] like Figure 5 The ceramic dielectric module shown corresponds to Figure 4 In the coordinate system shown, the open slot 11 is located on an edge parallel to the Y-axis, and the edge straddles one of the two opposite surfaces along the Z-axis and one of the two opposite surfaces along the X-axis. Therefore, for the first mode in the signal with polarization direction along the two opposite surfaces of the Z-axis and the second mode with polarization direction along the X-axis, the open slot 11 can couple the two modes, thereby forming a most basic tuning unit.

[0055] See also Figure 6 For the case where multi-mode tuning is required, especially the case of tuning three modes, another embodiment of the present invention provides another ceramic dielectric module, in which two opening slots 11 are arranged on different parts of the module, namely, Figure 5 Based on the modules of the embodiment, Figure 5 The opening groove is regarded as the first opening groove 111, and a second opening groove 112 is additionally provided.

[0056] Will Figure 6 The ceramic filter module shown corresponds to Figure 4It can be seen from the coordinate system that the second open slot 112 is located on an edge parallel to the X-axis, and the edge straddles one of the two opposite surfaces along the Z-axis and one of the two opposite surfaces along the Y-axis. Therefore, for the first mode in the signal with the polarization direction along the two opposite surfaces of the Z-axis and the third mode with the polarization direction along the Y-axis, the open slot 112 can couple the first mode with the third mode, thereby also forming a basic tuning unit. The module of this embodiment can be used in a multi-mode scenario, and the first mode therein is coupled with the second module and the third mode respectively.

[0057] According to the above principle disclosure about the basic unit of the module, the embodiment expanded here can be understood: specifically, a third open slot can be opened on an edge parallel to the Z axis, and the edge must straddle one of the two opposite surfaces along the X axis and one of the two opposite surfaces along the Y axis. Therefore, for the second mode with polarization direction along the X axis and the third mode with polarization direction along the Y axis in the signal, the open slot can couple these two modes, thereby also forming a basic tuning unit. Similarly, it can be used in a multi-mode scenario to couple the second mode and the third mode. Similarly, the module of this embodiment can be used in a multi-mode scenario to couple the first mode, the second mode, and the third mode in pairs.

[0058] Based on the aforementioned principle embodiments of the ceramic dielectric module of the present invention, when it is applied to specific application scenarios such as filters, preselection filters, delay filters, module assemblies, etc., the opening slots can be set according to actual conditions.

[0059] Since the length, width and height of the opening slots will affect the coupling effect, they can be flexibly set by those skilled in the art according to the tuning principle during the design stage. Therefore, in an improved embodiment, the width of one of the opening slots on its edge is greater than the widths of the remaining opening slots on their respective edges, that is, the sizes of the three opening slots are allowed to be set to be non-uniform as needed, but this does not affect the embodiment of the creative spirit of the present invention.

[0060] In another improved embodiment, one or more tuning holes can be set on the basis of various embodiments of the ceramic dielectric module of the present invention. These tuning holes can be set on any one or more of the six surfaces of the module, which can be flexibly determined by those skilled in the art to improve the tuning effect as needed, especially to play a role in adjusting the frequency.

[0061] In another improved embodiment, the ceramic dielectric module of the present invention can be hollowed out locally at one or more positions of its conductive metal layer to form a hollow area based on each embodiment, which can also improve the tuning effect.

[0062] In another embodiment of application, the ceramic dielectric module of the present invention is used for filtering. Figure 6 As shown in the figure, signal connection ports 201 and 202 can be arranged on the surface of the module, and the signal connection ports can be signal input ports or signal output ports. Generally speaking, when the signal input port 201 is arranged on one surface, the other signal input port 202 is arranged on the other surface. However, it is also feasible to arrange the signal input port 201 and the signal input port 202 on the same surface.

[0063] In another application embodiment of the signal connection port, the ceramic dielectric module of the present invention and another ceramic dielectric module constitute a module assembly. When used as a filter, each module can be provided with only a single signal connection port. Thus, a signal is input from a signal connection port used as a signal input port of one of the modules and output from a signal connection port used as a signal output port, and vice versa.

[0064] In another application embodiment, the ceramic dielectric module of the present invention is connected in series with two other ceramic dielectric modules to form a filter. In this case, the first and last modules can set the signal connection ports as the signal input port and the signal output port respectively, and the module in the middle does not need to set the signal connection port.

[0065] In the application scenario where the ceramic dielectric module of the present invention is used for filtering, by setting the opening slots at appropriate edges, it can be ensured that one of the opening slots participates in realizing the capacitive cross-coupling or inductive cross-coupling between the two modes of the multi-mode signal, so that in the first module, the first opening slot couples the first mode with the second mode, and the second opening slot couples the first mode with the third mode, and then in the second adjacent mode, the first mode is coupled with the third mode through the third opening slot set in the second module.

[0066] Figure 7 , Figure 8 , Fig. 9 as well as Fig.10 Several examples of ceramic dielectric modules of the measured embodiments are provided with the above-mentioned opening grooves on different edges, so as to participate in the exemplary structure of realizing capacitive cross coupling. The signal connection ports 201 and 202 of each figure are located in the forward direction of the figure and remain unchanged. It is assumed that the first opening groove 110 is on the edge formed by connecting the surfaces where the two signal connection ports 201 and 202 are located. Based on this, the relative relationship between the opening position and each signal connection port is briefly described below in combination with each figure:

[0067] Figure 7 As can be seen from the structure of the module shown, another opening slot 112 is located at the reference Figure 4The coordinate system of the invention is on an edge parallel to the X-axis, which edge is located above the visible surface on the right side shown in the figure, and the other opening slot 111 is located at the reference Figure 4 The coordinate system is on an edge parallel to the Y-axis, and the edge is located above the visible surface on the left side shown in the figure.

[0068] Figure 8 As can be seen from the structure of the module shown, another opening slot 113 is located at the reference Figure 4 The coordinate system of the invention is on an edge parallel to the X-axis, which edge is located above the invisible surface on the left side shown in the figure, and the other one of the opening slots 114 is located at the reference Figure 4 The coordinate system is on an edge parallel to the Y-axis, and the edge is located above the invisible surface on the right shown in the figure.

[0069] Fig. 9 The structure of the module shown is visible, and one of the other opening slots is not visible in the figure, which is located at the reference Figure 4 The coordinate system of the invention is on an edge parallel to the X-axis, the edge being located between the left side surface and the bottom surface which are not visible in the figure, and the other one of the opening slots 111 is located at the reference Figure 4 The coordinate system is on an edge parallel to the Y-axis, and the edge is located above the visible surface on the left side shown in the figure.

[0070] Fig.10 As can be seen from the structure of the module shown, another opening slot 112 is located at the reference Figure 4 The coordinate system of the edge is parallel to the X-axis, and the edge is located above the visible surface on the right side of the figure, while the other one of the openings is not visible in the figure and is located at the reference Figure 4 The coordinate system is on an edge parallel to the Y-axis, and the edge is located between the invisible right side and the invisible bottom surface shown in the figure.

[0071] The S21 parameter curves obtained after actual measurement of the above exemplary structures are as follows: Fig.11 The effect shown in FIG. 1 is that the resonance zero point is generated on the left side of the passband, from which it can be seen that each of the above exemplary structures can ensure that the ceramic dielectric module of the present invention is used to generate a capacitive cross-coupling effect.

[0072] Figure Logic, Fig.12 , Fig.13 , Fig.14 , Fig.15Several examples of ceramic dielectric modules that have been measured are provided with the above-mentioned opening grooves on different edges to participate in the exemplary structure of realizing inductive cross coupling. The signal connection ports in each figure are all located in the forward direction of the figure and remain unchanged. It is assumed that the first opening groove 110 is on the edge formed by connecting the surfaces where the two signal connection ports are located. Based on this, the relative relationship between the opening groove position and each signal connection port is briefly described below in combination with each figure:

[0073] Fig.12 As can be seen from the structure of the module shown, another opening slot 112 is located at the reference Figure 4 The coordinate system of the invention is on an edge parallel to the X-axis, which edge is located above the visible surface on the right side shown in the figure, and the other one of the opening slots 114 is located at the reference Figure 4 The coordinate system is on an edge parallel to the Y-axis, and the edge is located above the invisible surface to the right as shown in the figure.

[0074] Fig.13 As can be seen from the structure of the module shown, another opening slot 113 is located at the reference Figure 4 The coordinate system of the invention is on an edge parallel to the X-axis, which edge is located above the invisible surface on the left side shown in the figure, and the other one of the opening slots 111 is located at the reference Figure 4 The coordinate system is on an edge parallel to the Y-axis, and the edge is located above the visible surface on the left side shown in the figure.

[0075] Fig.14 As can be seen from the structure of the module shown, another opening slot 115 is located at the reference Figure 4 The coordinate system of the invention is on an edge parallel to the X-axis, the edge being located between the visible surface on the right side of the figure and the bottom surface, and the other opening slot 111 is located at the reference Figure 4 The coordinate system is on an edge parallel to the Y-axis, and the edge is located above the visible surface on the left side shown in the figure.

[0076] Fig.15 As can be seen from the structure of the module shown, another opening slot 112 is located at the reference Figure 4 The coordinate system of the invention is on an edge parallel to the X-axis, the edge being located between the visible surface on the right side of the figure and the top surface, and the other one of the opening slots 116 is located at the reference Figure 4 The coordinate system is on an edge parallel to the Y-axis, and the edge is located between the left visible surface and the bottom surface shown in the figure, and is below the left visible surface.

[0077] The S21 parameter curves obtained after actual measurement of the above exemplary structures are as follows: Fig.16The effect shown has a resonance zero point generated on the right side of the passband, from which it can be seen that each of the above exemplary structures can ensure that the ceramic dielectric module of the present invention is used to produce an inductive cross-coupling effect.

[0078] The present invention adopts the method of setting an open groove on the edge of the ceramic dielectric module to achieve coupling between multiple modes. Fig.11 and Fig.16 It can be seen that the ceramic dielectric module of the present invention can reduce the insertion loss of the filter and achieve a wider passband.

[0079] The opening slot arrangement of the ceramic dielectric module of the present invention can optimize the dimensional ratio relationship between the length, width and height of the module on the basis of satisfying high bandwidth. After actual measurement, a broadband of 180M is also achieved. The traditional length, width and height are 13.88mm, 13.89mm and 15.21mm respectively, while the designed length, width and height are 13.9mm, 13.0mm and 14.0mm respectively. It can be seen that the dimensional ratio relationship between the length, width and height of the module is optimized and is closer to being equivalent to each other, which is significantly better than the prior art.

[0080] Furthermore, in various embodiments using a plurality of ceramic dielectric modules of the present invention for combined use, windows can be provided on the facing surfaces of two modules facing each other for mutual coupling, thereby achieving mutual connection between the two modules, which is equivalent to achieving mutual coupling using air as a medium. Similarly, a waveguide or other dielectric material can be provided between the two facing surfaces to achieve such connection. Those skilled in the art should understand this.

[0081] Please combine Fig.17 and Fig.18 The present invention realizes a module assembly based on the ceramic dielectric module, and can also directly constitute a filter, which is formed by sequentially coupling two ceramic dielectric modules M of the present invention, and the connection between the two modules is assembled in a window coupling manner, wherein the signal connection ports 201 and 202 are respectively arranged on one surface of each of the two modules. The filter shown in the figure is also provided with the tuning hole 30.

[0082] In such a filter, two ceramic dielectric modules M are connected in sequence, and each of the three modes in one ceramic dielectric module can be coupled with a different one of the three modes of the other ceramic dielectric module through the open slot 11 in the ceramic dielectric module, and at the window where the two modules couple signals to each other, inductive cross-coupling and / or capacitive cross-coupling is generated between the two modes through the magnetic field response.

[0083] In an alternative embodiment, the windows of two sequential ceramic dielectric modules may be connected by dielectric material or waveguide in addition to air coupling.

[0084] In other alternative embodiments, the filter includes two ceramic dielectric modules, wherein the first ceramic dielectric module is provided with two open slots, and the second ceramic dielectric module is provided with three open slots. The specific method can be determined by those skilled in the art according to the creative spirit of the present invention and actual filtering requirements.

[0085] In summary, the present invention optimizes the tuning effect of the module by setting an open groove at a non-end position of the edge of the ceramic dielectric module, thereby optimizing the ratio of the length, width and height of the module, which is superior to the prior art.

[0086] The above description is only a preferred embodiment of the present invention and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present invention is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the above inventive concept. For example, the above features are replaced with the technical features with similar functions invented in the present invention (but not limited to) to form a technical solution.

Claims

1. A module assembly includes a plurality of ceramic dielectric modules for tuning a multi-mode signal passing therethrough. The ceramic dielectric modules are in a block shape and have a conductive metal layer covering their surfaces. It is characterized in that: The ceramic dielectric modules are sequentially connected to each other through their windows to achieve mutual coupling. Signal connection ports are respectively provided on the ceramic dielectric modules at the first and last levels in the sequence. Between two modules facing each other, windows are provided on their facing surfaces for mutual coupling to realize the mutual connection between the two modules. The ceramic dielectric module is provided with an opening groove for realizing the coupling between the modes of the multi-mode signal. Each opening groove is located at a non-terminal position on a corresponding edge of the ceramic dielectric module. The opening groove occupies a block-shaped space and is symmetrically arranged on both sides of the edge where it is located with respect to the edge. In two sequentially connected ceramic dielectric modules, each of the three modes in one ceramic dielectric module is coupled to a different mode among the three modes in the other ceramic dielectric module through the opening groove in this ceramic dielectric module.

2. The module assembly according to claim 1, It is characterized in that: The module assembly is provided with at least two of the opening grooves, and the respective edges provided with the opening grooves are respectively parallel to different coordinate axes fictitiously established with reference to a three-dimensional Cartesian coordinate system.

3. The module assembly according to claim 2, It is characterized in that: The module assembly is provided with two of the opening grooves, wherein the first opening groove is used to realize the coupling between the first mode and the second mode in the multi-mode signal, and the second opening groove is used to realize the coupling between the first mode and the third mode in the multi-mode signal.

4. The module assembly according to claim 3, It is characterized in that: The module assembly is further provided with a third opening groove for realizing the coupling between the second mode and the third mode.

5. The module assembly according to any one of claims 2 to 4, It is characterized in that: The width occupied by one of the opening grooves on its edge is greater than the widths occupied by the remaining opening grooves on their respective edges.

6. The module assembly according to claim 1, It is characterized in that: One of the opening grooves is used to participate in realizing capacitive cross-coupling / inductive cross-coupling between two modes of the multi-mode signal.

7. The module assembly according to any one of claims 1 to 4, It is characterized in that: The surface of the module assembly is provided with at least one tuning hole.

8. The module assembly according to any one of claims 1 to 4, It is characterized in that: The module assembly is provided with signal connection ports on its surface, and the signal connection ports are signal input ports and / or signal output ports.

9. The module assembly according to any one of claims 1 to 4, It is characterized in that: The surface of the opening groove is plated with a conductive metal layer.

10. The module assembly according to any one of claims 1 to 4, It is characterized in that: There are many hollowed-out areas on the conductive metal layer of the ceramic dielectric module where the conductive metal layer is partially removed.

11. The module assembly according to claim 1, It is characterized in that: At the window, inductive cross-coupling and / or capacitive cross-coupling are generated between two modes through a magnetic field.

12. The module assembly according to claim 1 or 11, wherein: The module assembly includes two of the ceramic dielectric modules, wherein the first ceramic dielectric module is provided with two of the open slots, and the second ceramic dielectric module is provided with three of the open slots.

13. The module assembly according to claim 1 or 11, wherein: The windows of two consecutive ceramic dielectric modules are connected by a dielectric material or a waveguide.

14. A filter, wherein: It includes the module assembly according to any one of claims 1 to 13.

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