Dielectric filter unit and dielectric filter

Abstract

The application provides a medium filter unit and a medium filter. The medium filter unit comprises a medium resonator, a first connecting piece comprising a first shell and a first coupling wall, and a second connecting piece comprising a second shell and a second coupling wall, the second connecting piece is detachably connected with the first connecting piece, and the first shell, the first coupling wall, the second shell and the second coupling wall form a first cavity when connected; the medium resonator is arranged in the first cavity, is used for realizing resonance of degenerate modes, and separates the first cavity into a first air resonance cavity and a second air resonance cavity. According to the scheme provided by the embodiment of the application, the first connecting piece, the second connecting piece and the medium resonator are detachably connected, resonance of degenerate modes can be realized in the medium resonator, transmission of useful signals is realized, the filtering function of a dual-mode medium filter can be realized, and the medium filter unit and the medium filter with the structure have the advantages of simple assembly process and good adjustability.

Description

Technical Field

[0001] The embodiments of the present invention relate to, but are not limited to, the field of communications, and particularly to a dielectric filtering unit and a dielectric filter. Background Technology

[0002] In mobile communications, spurious and blocking interference may exist between different spectrums. To ensure good uplink and downlink performance and normal operation of base stations, filters with various performance characteristics are required internally. Using dielectric materials instead of traditional air-cavity metal filters allows for a smaller filter size while maintaining the same specifications. The resonant cavity of a dielectric filter can accommodate multiple electromagnetic field operating modes. For example, existing dual-mode ceramic dielectric filters consist of two ceramic dielectric elements requiring signal coupling. The ends of each ceramic dielectric element are hollowed out to form air blind slots, which are then connected by a metal diaphragm to form a complete filter. However, due to the different coefficients of thermal expansion between the ceramic dielectric material and the metal diaphragm, they can only be connected by adhesive or welding, resulting in complex manufacturing processes, poor reliability, and difficulty in disassembling the ceramic dielectric material after connection, leading to poor adjustability. Summary of the Invention

[0003] The following is an overview of the subject matter described in detail herein. This overview is not intended to limit the scope of the claims.

[0004] This invention provides a dielectric filtering unit and a dielectric filter, which have the advantages of simple assembly process and good adjustability.

[0005] In a first aspect, embodiments of the present invention provide a dielectric filtering unit, comprising:

[0006] The first connector includes a first housing and a first coupling wall;

[0007] The second connector includes a second outer shell and a second coupling wall. Both the first coupling wall and the second coupling wall are provided with coupling windows. The second connector is detachably connected to the first connector. When the second connector is connected to the first connector, the first outer shell, the first coupling wall, the second outer shell, and the second coupling wall form a first cavity.

[0008] A dielectric resonator is detachably installed in the first cavity, which divides the first cavity into a first air resonator and a second air resonator, so that a signal is transmitted from the first air resonator to the second air resonator through the dielectric resonator.

[0009] The dielectric resonator is used for degenerate mode resonance.

[0010] Secondly, embodiments of the present invention also provide a dielectric filter, including the dielectric filtering unit as described in the first aspect above.

[0011] This invention includes: a first connector, a second connector, and a dielectric resonator. The first connector includes a first housing and a first coupling wall, and the second connector includes a second housing and a second coupling wall. Both the first and second coupling walls are provided with coupling windows. The first and second connectors are detachably connected. When the first and second connectors are connected, the first housing, the first coupling wall, the second housing, and the second coupling wall form a first cavity. A dielectric filter is detachably installed in the first cavity, dividing the first cavity into a first air resonant cavity and a second air resonant cavity, so that a signal is transmitted from the first air resonant cavity to the second air resonant cavity through the dielectric resonator. The dielectric resonator is used for degenerate mode resonance. According to the solution provided in the embodiments of the present invention, by connecting the first connector and the second connector, a dielectric resonator that can be used for degenerate mode resonance is detachably installed in a first cavity formed by a first housing, a first coupling wall, a second housing, and a second coupling wall, thereby forming a dielectric filter unit. The dielectric filter unit has a dielectric resonator capable of realizing signal resonance, a first air resonant cavity, and a second air resonant cavity. The dielectric resonator can realize resonance in mutually degenerate mode operating modes, thereby enabling the transmission of useful signals to achieve the filtering function of a dual-mode dielectric filter. In addition, since the first connector and the second connector are detachably connected, the dielectric resonator can be flexibly replaced according to the actual use to meet different filtering performance requirements. Therefore, it has the advantages of simple assembly process, easy disassembly and assembly, and good adjustability.

[0012] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the description, claims, and drawings. Attached Figure Description

[0013] The accompanying drawings are provided to further understand the technical solutions of the present invention and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the technical solutions of the present invention, and do not constitute a limitation on the technical solutions of the present invention.

[0014] Figure 1 This is a schematic diagram of the structure of a dual-mode dielectric filter in the prior art;

[0015] Figure 2 This is a cross-sectional view of a media filtering unit provided in an embodiment of the present invention;

[0016] Figure 3This is a schematic diagram of the structure of a dielectric filter provided in one embodiment of the present invention;

[0017] Figure 4 This is a schematic diagram of the structure of a dielectric resonator provided in one embodiment of the present invention;

[0018] Figure 5 yes Figure 4 The cross-sectional view of the dielectric resonator shown in the figure;

[0019] Figure 6 yes Figure 3 The exploded view of the dielectric filter is shown in the image.

[0020] Figure 7 This is a schematic diagram of the structure when the first connector and the second connector are connected according to another embodiment of the present invention;

[0021] Figure 8 This is a schematic diagram of the structure of a first connector with a coupling window provided in another embodiment of the present invention. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0023] It should be noted that the terms "first," "second," etc., in the specification, claims, and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0024] This invention provides a dielectric filtering unit and a dielectric filter. The dielectric filtering unit includes a first connector, a second connector, and a dielectric resonator. The first connector includes a first housing and a first coupling wall, and the second connector includes a second housing and a second coupling wall. Both the first and second coupling walls are provided with coupling windows. The first and second connectors are detachably connected. When the first and second connectors are connected, the first housing, the first coupling wall, the second housing, and the second coupling wall form a first cavity. The dielectric resonator for degenerate mode resonance is detachably installed in the first cavity, dividing the first cavity into a first air resonant cavity and a second air resonant cavity, so that the signal is transmitted from the first air resonant cavity to the second air resonant cavity through the dielectric resonator. Since the dielectric resonator, the first air resonant cavity, and the second air resonant cavity can all resonate the signal, and the dielectric resonator can achieve resonance in a degenerate mode, it can transmit the useful signal to realize the filtering function of the dual-mode dielectric filter. In addition, since the first connector and the second connector are detachably connected, the dielectric resonator can be flexibly replaced according to the actual use to meet different filtering requirements, thus having the advantages of simple assembly process, easy disassembly and assembly, and good adjustability.

[0025] The embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0026] like Figure 1 As shown, Figure 1 This is a schematic diagram of a dual-mode dielectric filter in related technologies. The dual-mode dielectric filter consists of two ceramic dielectric blocks 100 and a metal diaphragm 120. Each ceramic dielectric block 100 has two blind slots 110 formed by hollowing out both ends, which are then connected by the metal diaphragm 120. The blind slots 110 formed by hollowing out the ceramic dielectric blocks 100 result in thinner edges, making the ceramic dielectric blocks 100 more difficult to manufacture and prone to breakage. Furthermore, the ceramic dielectric blocks 100 and the metal diaphragm 120 can only be connected by adhesive or welding, a complex process that makes disassembly difficult, resulting in poor adjustability of the dielectric filter.

[0027] To address the problems existing in the dual-mode dielectric filters of the aforementioned related technologies, one embodiment of the present invention provides a dielectric filtering unit, such as... Figure 2 As shown, Figure 2 This is a cross-sectional view of a media filtering unit provided in an embodiment of the present invention.

[0028] In such Figure 2The dielectric filter unit 200 shown includes a first connector 210, a second connector 220, and a dielectric resonator 240. The first connector 210 includes a first housing (not shown) and a first coupling wall 215. The second connector 220 includes a second housing (not shown) and a second coupling wall 216. Both the first coupling wall 215 and the second coupling wall 216 are provided with coupling windows 227. The second connector 220 is detachably connected to the first connector 210. When component 210 is connected, the first housing, the first coupling wall 215, the second housing, and the second coupling wall 216 enclose and form a first cavity 230. The dielectric resonator 240 is detachably installed in the first cavity 230, and the dielectric resonator 240 divides the first cavity 230 into a first air resonator 250 and a second air resonator 260, so that a signal can be transmitted from the first air resonator 250 to the second air resonator 260 through the dielectric resonator 240. In addition, the dielectric resonator 240 can be used for degenerate mode resonance.

[0029] Those skilled in the art will understand that the dielectric resonator 240 can be made of ceramic dielectric material, which has advantages such as low loss and good electromagnetic performance, and is conducive to the miniaturization of dielectric filters.

[0030] Specifically, the first connector 210 and the second connector 220 can be made of metal and can be formed by machining or die casting, which simplifies the process and reduces the need for metal diaphragms. Correspondingly, the dielectric resonator 240 can undergo surface metallization treatment, that is, the area of ​​the dielectric resonator 240 in contact with the first connector 210 and the second connector 220 is surface-metallized, which can solve the problem of complex connection processes and poor reliability between metal and ceramic materials with different coefficients of thermal expansion in related technologies. Alternatively, the first connector 210 and the second connector 220 can also be made of non-metallic materials, in which case both the surfaces of the first connector 210 and the second connector 220 are metallized.

[0031] It is understandable that the first connector 210 and the second connector 220 have the same structure, which facilitates the cascading of multiple dielectric filter units 200 to form a dielectric filter 400 (e.g., Figure 3 (As shown). The first connector 210 and the second connector 220 can be in the shape of a cuboid, a cylinder, or an irregularly shaped cube; correspondingly, the dielectric resonator 240 can also be a cuboid, a cylinder, or an irregularly shaped cube.

[0032] In one embodiment, such as Figure 3 As shown, when the second connector 220 is connected to the first connector 210, a debugging window 270 is formed. Further, as... Figure 4As shown, the dielectric resonator 240 may be provided with an adjustment hole 280, which faces the adjustment window 270, making the adjustment hole 280 exposed. This allows the dielectric resonator 240 to be adjusted without disassembling the dielectric filter unit 200, ensuring that the dielectric filter unit 200 meets the filtering performance requirements. It should be noted that the specific method of adjusting the dielectric resonator 240 through the adjustment hole 280 can involve using external tools to alter the mass of the dielectric resonator 240 through the adjustment hole 280 to achieve the purpose of adjustment. For example, a portion of the dielectric resonator 240 can be removed from the adjustment hole 280 using external tools. This embodiment does not specifically limit this method.

[0033] Specifically, such as Figure 5 As shown, the position of the tuning hole 280 affects the frequency of the degenerate operating modes (e.g., the first and second modes with the same cutoff wavelength) and the coupling between operating modes differently within the dielectric resonator 240. For example, the tuning hole 280 along the Y-axis can tune the frequency of the first mode, the tuning hole 280 along the X-axis can tune the frequency of the second mode, and the tuning hole 280 along the 45° diagonal direction between the X and Y coordinates can tune the coupling between the first and second modes. The tuning hole 280 can be a blind hole, and its cross-section can be circular, rectangular, or irregular. Those skilled in the art will understand that when the first and second modes have equal cutoff wavelengths, they are degenerate modes. For example, when the cutoff wavelengths of the TMmn mode and the TEmn mode within the dielectric resonator 240 are equal, the TMmn mode and the TEmn mode are degenerate modes, where m and n are natural numbers, and m and n cannot both be zero.

[0034] In one embodiment, such as Figure 3 As shown, the first connector 210 and the second connector 220 are detachably connected by a locking device 290. This locking device 290 can be a common assembly and fastening structure, such as a mounting hole with a mounting screw or stud, a mounting hole with a mounting screw, or a nut. Screws, bolts, or various known locking fasteners facilitate the connection and disassembly of the various components of the media filter unit 200, thereby improving adjustability.

[0035] Specifically, such as Figure 6As shown, the locking device 290 includes a first locking lug 291, a second locking lug 292, a connecting rod 293, and a nut (not shown in the figure). The first locking lug 291 is disposed on the first connecting member 210, and the second locking lug 292 is disposed on the second connecting member 220. Both the first locking lug 291 and the second locking lug 292 can extend along the center line 294. When the first connecting member 210 and the second connecting member 220 are connected, the first locking lug 291 and the second locking lug 292 are tightly fitted together, thereby increasing the overall strength of the filter. An elastic component (not shown in the figure) can also be provided on the inner side of the nut, such as an elastic rubber, silicone washer, or spring sheet arranged circumferentially along the inner side of the nut. This allows the entire locking device 290 to have a certain degree of elasticity along the radial direction of the nut, thereby increasing stress release under high and low temperatures and improving reliability. Furthermore, the number of locking devices 290 provided in each dielectric filter unit 200 can be greater than or equal to two sets, and they are evenly distributed throughout the dielectric filter unit 200 to achieve a better locking effect.

[0036] In one embodiment, such as Figure 7 As shown, a first outer shell (not shown) and a first coupling wall 215 form a first connecting cavity 211; a second outer shell (not shown) and a second coupling wall 216 form a second connecting cavity 221; when the second connector 220 is connected to the first connector 210, the first connecting cavity 211 and the second connecting cavity 221 form a first cavity 230.

[0037] Furthermore, such as Figure 7 As shown, the first connecting cavity 211 includes a first groove 212 and a second groove 213. The inner diameter of the first groove 212 is larger than the inner diameter of the second groove 213, so that a first boss 214 is formed between the first groove 212 and the second groove 213. The second connecting cavity 221 includes a third groove 222 and a fourth groove 223. The inner diameter of the third groove 222 is larger than the inner diameter of the fourth groove 223, so that a second boss 224 is formed between the third groove 222 and the fourth groove 223. In this structure, the dielectric resonator 240 can be installed between the first boss 214 and the second boss 224. For example... Figure 2 As shown, the dielectric resonator 240 is detachably mounted between the first boss 214 and the second boss 224, which makes the structure of the dielectric filter unit 200 more compact. In addition, the second groove 213 and the fourth groove 223 form a first air resonant cavity 250 and a second air resonant cavity 260 between the dielectric resonator 240 and the dielectric resonator 240, respectively. The first air resonant cavity 250 and the second air resonant cavity 260 can push the frequency of the non-operating mode further away, which can improve the no-load Q value of the dielectric filter unit 200, thereby reducing losses and improving filtering efficiency.

[0038] In another embodiment, the first connector 210 and the second connector 220 can be configured to be seamlessly joined or with a seam. For example, when configured as a seamless join, such as... Figure 3 As shown, the first connector 210 and the second connector 220 have notches at their connecting edges, forming an adjustment window 270 after docking. This adjustment window 270 exposes the adjustment hole (not shown in the figure) of the dielectric resonator 240, thereby achieving the purpose of adjustment without disassembly after assembly.

[0039] In one embodiment, such as Figure 2 As shown, elastic pads 300 are provided between the dielectric resonator 240 and the first boss 214, and between the dielectric resonator 240 and the second boss 224, forming elastic stress buffer layers. This makes the connection and fit between the dielectric resonator 240 and the first connector 210 and the second connector 220 more flexible and tighter. The shapes of the first boss 214 and the second boss 224 can be circular rings, square rings, irregular shapes, or discontinuous bosses. Correspondingly, the shape of the elastic pads 300 can also be circular rings, square rings, irregular shapes, or discontinuous shapes. The elastic pads 300 can be made of elastic materials such as springs or conductive cotton. It is understood that the elastic pads 300 can be added or removed according to actual conditions.

[0040] In one embodiment, such as Figure 7 As shown, the first outer shell and the first coupling wall 215 further form a third connecting cavity 225, which can be used for splicing multiple dielectric filter units 200; the second outer shell and the second coupling wall 216 further form a fourth connecting cavity 226, which can also be used for splicing multiple dielectric filter units 200. It should be noted that, in order to facilitate the splicing of multiple dielectric filter units 200 and to realize the fabrication of standard parts, the shape of the third connecting cavity 225 can be symmetrical with the shape of the first connecting cavity 211, and the shape of the fourth connecting cavity 226 can be symmetrical with the shape of the second connecting cavity 221.

[0041] In addition, such as Figure 8 As shown, the coupling window 227 disposed on the first coupling wall 215 is a through slot that penetrates the first coupling wall 215. Similarly, the coupling window 227 disposed on the second coupling wall 216 is also a through slot that penetrates the second coupling wall 216. The shape of the coupling window 227 is not limited, for example, it can be rectangular, cross-shaped, elliptical, etc.

[0042] In one embodiment, such as Figure 6As shown, the dielectric resonator 240 is provided with a dielectric coupling hole 241, which faces the first connecting cavity 211 and / or the second connecting cavity 221. Coupling between different operating modes within the dielectric resonator 240 can be achieved through the dielectric coupling hole 241. It should be noted that the dielectric coupling hole 241 can be a blind hole or a through hole, and its shape is not limited. The position of the dielectric coupling hole 241 can be located at the center line 294 of the dielectric resonator 240 or in a region off-center from the center line 294. The number of dielectric coupling holes 241 on each dielectric resonator 240 is also not limited. It is worth noting that when the dielectric resonator 240 is provided with a tuning hole 280, the dielectric coupling hole 241 can be removed. When the dielectric filter 400 is composed of multiple cascaded dielectric filter units 200, adjacent dielectric resonators 240 can be coupled to signals through the dielectric coupling hole 241.

[0043] The connection structure of the medium filtering unit 200 provided in the embodiments of the present invention will be described in detail below with specific examples.

[0044] Example 1

[0045] In such Figure 2 and Figure 7 As shown, the dielectric filter unit 200 is formed by connecting the first connector 210, the second connector 220 and the dielectric resonator 240. The dielectric resonator is used for the resonance of degenerate modes.

[0046] Specifically, in combination Figure 3 , Figure 6 and Figure 8 As shown, the first connector 210, the second connector 220, and the dielectric resonator 240 are all cylindrical. The first connector 210 includes a first connecting cavity 211 and a third connecting cavity 225, and a first coupling wall 215 is formed between the first connecting cavity 211 and the third connecting cavity 225. The second connector 220 includes a second connecting cavity 221 and a fourth connecting cavity 226, and a second coupling wall 216 is formed between the second connecting cavity 221 and the fourth connecting cavity 226. Both the first coupling wall 215 and the second coupling wall 216 are provided with cross-shaped coupling windows 227, which are used to couple signals between adjacent dielectric filter units 200 when multiple dielectric filter units 200 are cascaded.

[0047] Furthermore, the first connecting cavity 211 includes a first groove 212 and a second groove 213. The inner diameter of the first groove 212 is larger than the inner diameter of the second groove 213, so that a first boss 214 is formed between the first groove 212 and the second groove 213. The second connecting cavity 221 includes a third groove 222 and a fourth groove 223. The inner diameter of the third groove 222 is larger than the inner diameter of the fourth groove 223, so that a second boss 224 is formed between the third groove 222 and the fourth groove 223. The dielectric resonator 240 is installed between the first boss 214 and the second boss 224. Both the first boss 214 and the second boss 224 are provided with elastic pads 300 to form a stress buffer layer, making the structure of the dielectric filter unit 200 more reliable. The dielectric resonator 240 is partially exposed through the adjustment window 270 and is provided with a dielectric coupling hole 241 and / or an adjustment hole 280. The dielectric coupling hole 241 faces the first connector 210 and / or the second connector 220, and the adjustment hole 280 is located at the adjustment window 270, allowing direct adjustment of the operating mode of the dielectric resonator 240 without disassembly. Furthermore, three adjustment holes 280 can be provided, allowing adjustment from three different directions. When there is no adjustment window 270 between the first connector 210 and the second connector 220, and adjustment is required, the locking device 290 can be opened to remove the dielectric resonator 240 for replacement or adjustment. Therefore, the dielectric filter unit 200 based on the above structure has good adjustability and is simple to assemble.

[0048] Furthermore, another embodiment of the present invention provides a dielectric filter that includes the dielectric filtering unit 200 as described in any of the embodiments above. This dielectric filter then possesses the beneficial effects provided by the dielectric filtering unit 200 in any of the embodiments described above, for example, such as... Figure 3 and Figure 6 As shown, the dielectric filter 400 is composed of a port cavity (not shown), a port connector (not shown), and multiple cascaded dielectric filter units 200. The first connector 210 and the second connector 220 of each dielectric filter unit 200 have the same structure and are detachably connected by a locking device 290. The dielectric resonator 240 is disposed in the first cavity 230 formed by the first connector 210 and the second connector 220. The contact surfaces between all components are made of the same material, which avoids complex connection processes, simplifies assembly, improves reliability, and enhances the adjustability of the dielectric filter 400's operating mode. Furthermore, a debugging window 270 is provided at the connection between the first connector 210 and the second connector 220, and a debugging hole 280 is provided on the sidewall edge of the dielectric resonator 240. The debugging hole 280 is exposed through the debugging window 270, allowing direct debugging of the dielectric resonator 240 from outside the dielectric filter 400 without disassembly, further increasing adjustability.

[0049] The above is a detailed description of the preferred embodiments of the present invention. However, the present invention is not limited to the above embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention. All such equivalent modifications or substitutions are included within the scope defined by the claims of the present invention.

Claims

1. A dielectric filtering unit, characterized in that, include: The first connector includes a first housing and a first coupling wall; The second connector includes a second outer shell and a second coupling wall. Both the first coupling wall and the second coupling wall are provided with coupling windows. The second connector is detachably connected to the first connector. When the second connector is connected to the first connector, the first outer shell, the first coupling wall, the second outer shell, and the second coupling wall form a first cavity. A dielectric resonator is detachably installed in the first cavity, which divides the first cavity into a first air resonator and a second air resonator, so that a signal is transmitted from the first air resonator to the second air resonator through the dielectric resonator. The dielectric resonator is used for degenerate mode resonance; Wherein, when the second connector is connected to the first connector, a debugging window is formed; the dielectric resonator is provided with a debugging hole, and the debugging hole faces the debugging window.

2. The media filtering unit according to claim 1, characterized in that, The first connector and the second connector are detachably connected by a locking device.

3. The medium filtering unit according to claim 2, characterized in that, The locking device includes a first locking lug, a second locking lug, a connecting rod, and a nut. The first locking lug is disposed on the first connecting member, and the second locking lug is disposed on the second connecting member.

4. The medium filtering unit according to claim 3, characterized in that, An elastic component is provided on the inner side of the nut.

5. The medium filtering unit according to claim 1, characterized in that, The first outer shell and the first coupling wall form a first connecting cavity; the second outer shell and the second coupling wall form a second connecting cavity; when the second connector is connected to the first connector, the first connecting cavity and the second connecting cavity form the first cavity.

6. The medium filtering unit according to claim 5, characterized in that, The inner wall of the first connecting cavity is provided with a first boss; the inner wall of the second connecting cavity is provided with a second boss; the dielectric resonator is detachably installed between the first boss and the second boss.

7. The medium filtering unit according to claim 6, characterized in that, Spring pads are provided between the dielectric resonator and the first boss, and between the dielectric resonator and the second boss.

8. The media filtering unit according to claim 1 or 5, characterized in that, The first outer shell and the first coupling wall form a third connecting cavity, which is used for splicing between multiple media filtering units.

9. The medium filtering unit according to claim 8, characterized in that, The second outer shell and the second coupling wall form a fourth connection cavity, which is used for splicing between multiple media filtering units.

10. The medium filtering unit according to claim 5, characterized in that, The dielectric resonator is provided with a dielectric coupling hole, which faces the first connecting cavity and / or the second connecting cavity.

11. A dielectric filter, characterized in that, Includes the media filtering unit as described in any one of claims 1 to 10.

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