Filter and communication device

Abstract

The present application is applicable to the field of communication technology, and provides a filter and a communication device, wherein the communication device includes a filter, and the filter includes a cavity, a cover plate, a dielectric resonator and a fastener. The cover plate covers the cavity and is provided with a first hole therethrough. The dielectric resonator is provided in the cavity and is supported by the cover plate. A second hole opposite to the first hole is provided at one end of the dielectric resonator facing the cover plate. The fastener is passed through the first hole and locked in the second hole to relatively fix the dielectric resonator and the cover plate along the through-direction of the first hole. By passing the fastener through the first hole of the cover plate and locking it in the second hole of the dielectric resonator, the dielectric resonator and the cover plate can be relatively fixed along the through-direction of the first hole. In this way, the cover plate and the dielectric resonator can be stably, tightly and reliably fitted along the through-direction of the first hole under the action of the fastener, which can effectively reduce the insertion loss and intermodulation of the filter and improve the performance indicators of the filter.

Description

Technical Field

[0001] The present application belongs to the field of communication technology, and more specifically, relates to a filter and a communication device. Background Art

[0002] A filter typically includes a cavity, a dielectric resonator disposed within the cavity, and a cover plate that covers the cavity. During the assembly process, due to certain tolerances in the assembly between the cavity and the cover plate, as well as in the height of the dielectric resonator, it is difficult for the dielectric resonator to reliably fit the cover plate. Furthermore, the plane where the dielectric resonator and the cover plate abut each other cannot be absolutely smooth as in an ideal state, and inevitably has unevenness that is difficult to see with the naked eye, which leads to nonlinear contact between the dielectric resonator and the cover plate. As a result, there may be a certain gap or nonlinear contact between the dielectric resonator and the cover plate, resulting in increased insertion loss, higher intermodulation, and poorer filter performance. Summary of the Invention

[0003] One of the purposes of the embodiments of the present application is to provide a filter and a communication device that can improve the problem in the related art that the dielectric resonator of the filter is difficult to reliably fit the cover plate, resulting in poor filter performance indicators.

[0004] To solve the above technical problems, the technical solutions adopted in the embodiments of the present application are:

[0005] In a first aspect, an embodiment of the present application provides a filter, comprising:

[0006] cavity;

[0007] a cover plate, covering the cavity and having a first hole therethrough;

[0008] a dielectric resonator disposed in the cavity and abutting against the cover plate; a second hole opposite to the first hole is provided at one end of the dielectric resonator facing the cover plate;

[0009] A fastener is provided through the first hole and locked in the second hole to relatively fix the dielectric resonator and the cover plate along a penetrating direction of the first hole.

[0010] In some embodiments, the fastener is threadedly fitted or interference fit with the first hole; and / or, the fastener is threadedly fitted or interference fit with the second hole.

[0011] In some embodiments, the fastener includes a fastening portion and a first limiting portion arranged on the outer peripheral side of the fastening portion, the fastening portion is passed through the first hole and locked in the second hole, and the cover plate is limited to the first limiting portion in a direction away from the dielectric resonator.

[0012] In some embodiments, a plurality of first protrusions distributed at intervals are provided at one end of the dielectric resonator facing the cover plate, and the first protrusions abut against the cover plate.

[0013] In some embodiments, the dielectric resonator includes a metal resonant rod and a dielectric member, the metal resonant rod is arranged in the cavity, the dielectric member is arranged between the metal resonant rod and the cover plate, and respectively supports the metal resonant rod and the cover plate, and the second hole is opened in the dielectric member and / or the metal resonant rod.

[0014] In some embodiments, the second aperture comprises:

[0015] a first section passing through the dielectric member and facing the first hole;

[0016] The second section is arranged at one end of the metal resonance rod facing the dielectric member and is opposite to the first section; the fastener is locked to the first section and / or the second section.

[0017] In some embodiments, a plurality of second protrusions distributed at intervals are provided on one end of the dielectric member away from the cover plate, and the second protrusions are supported against the metal resonant rod.

[0018] In some embodiments, the dielectric resonator further includes a limiting member, and the limiting member includes:

[0019] A limiting sleeve, sleeved outside the dielectric member and / or outside the metal resonant rod;

[0020] A plurality of second limiting portions are arranged at intervals in the limiting sleeve; the second limiting portion is arranged at one end of the metal resonance rod facing the dielectric member and between two adjacent second convex portions.

[0021] In some embodiments, the dielectric resonator is configured as a dielectric resonant rod, and one end of the dielectric resonant rod away from the cover plate abuts against the cavity.

[0022] In some embodiments, the cover plate is recessed to form a groove, and the groove is arranged around the outer circumference of a position of the cover plate corresponding to the dielectric resonator.

[0023] In some embodiments, the filter further includes a tuning element, the cover plate is provided with a third hole spaced apart from the first hole, the tuning element passes through the third hole to extend into the cavity, and the length of the tuning element extending into the cavity is adjustable.

[0024] In a second aspect, an embodiment of the present application provides a communication device comprising the filter.

[0025] The filter and communication device provided by the embodiments of the present application have the following beneficial effects:

[0026] The filter provided in the embodiments of the present application is capable of fixing the dielectric resonator and the cover plate relative to each other along the through-direction of the first hole by inserting a fastener through the first hole of the cover plate and locking it to the second hole of the dielectric resonator. That is, the fastener fixes the cover plate to the dielectric resonator along the through-direction of the first hole. In this way, under the action of the fastener, the cover plate and the dielectric resonator can be stably, tightly, and reliably fitted along the through-direction of the first hole, thereby effectively reducing the insertion loss and intermodulation of the filter and improving the performance indicators of the filter. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0028] Figure 1 A three-dimensional schematic diagram of a filter provided in some embodiments of the present application;

[0029] Figure 2 for Figure 1 Exploded view of the provided filter;

[0030] Figure 3 for Figure 1 Sectional view along AA;

[0031] Figure 4 for Figure 3 Enlarged view of point B in the middle;

[0032] Figure 5 for Figure 1 A three-dimensional schematic diagram of a dielectric component of a provided filter;

[0033] Figure 6 for Figure 1 A three-dimensional schematic diagram of a limiting member of the provided filter;

[0034] Figure 7 Cross-sectional views of filters provided in some other embodiments of the present application.

[0035] Among them, the reference numerals in the figures are:

[0036] 10-cavity; 20-cover; 201-first hole; 202-groove; 203-third hole; 30-dielectric resonator; 301-second hole; 3011-first section; 3012-second section; 31-metal resonant rod; 32-dielectric member; 321-first protrusion; 322-second protrusion; 323-first main body; 33-limiting member; 331-limiting sleeve; 332-second limiting part; 34-dielectric resonant rod; 341-second main body; 342-third protrusion; 40-fastener; 41-fastening part; 42-first limiting part; 50-tuning element; 60-resonant cavity; 70-first connector. DETAILED DESCRIPTION

[0037] The following describes in detail embodiments of the present application, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0038] In the description of this application, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0039] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or to implicitly indicate the quantity of the technical features indicated. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features.

[0040] In the description of this application, "a plurality of" means more than two, and unless otherwise specifically defined, "more than two" includes two. Accordingly, "a plurality of groups" means more than two groups, including two groups.

[0041] In this application, unless otherwise expressly specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components or interactions between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on specific circumstances.

[0042] In this application, the term "and / or" is simply a description of the association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists, A and B exist at the same time, and B exists. In addition, in this application, the character " / " generally indicates that the related objects are in an "or" relationship.

[0043] In related art, a filter includes a cavity, a dielectric resonator disposed within the cavity, and a cover plate that covers the opening of the cavity. The dielectric resonator can be a dielectric resonator rod or a metal resonator rod loaded with a dielectric. In some filter applications, such as TM mode dielectric filters, the dielectric resonator must be tightly and reliably held against the cover plate.

[0044] During filter assembly, tolerances exist between the cavity and cover plate, as well as in the height of the dielectric resonator, making it difficult for the dielectric resonator to securely fit the cover plate. Furthermore, the surface where the dielectric resonator and cover plate abut each other cannot be perfectly smooth as in an ideal state, inevitably exhibiting unevenness that is difficult to see with the naked eye. This can lead to nonlinear contact between the dielectric resonator and the cover plate. This can create a gap or nonlinear contact between the dielectric resonator and the cover plate, which can easily increase the filter's insertion loss, increase intermodulation, and degrade filter performance.

[0045] In some embodiments, by providing a spring sheet on the cover plate, the fit between the dielectric resonator and the cover plate can be improved to a certain extent. For example, the spring sheet includes multiple elastic petals, each having two opposing ends. One end of the multiple elastic petals is fixed to the cover plate and located on the periphery of the position of the cover plate corresponding to the dielectric resonator; the other end of the multiple elastic petals presses against the position of the cover plate corresponding to the dielectric resonator. In this way, the multiple elastic petals can elastically press against the position of the cover plate corresponding to the dielectric resonator due to their own elastic properties, thereby achieving a compacting effect of the cover plate on the dielectric resonator, thereby improving the fit between the dielectric resonator and the cover plate.

[0046] However, the elastic properties of the springs tend to lose their elasticity over extended use, rendering their compressive force on the cover ineffective. This reduces the fit between the cover and the dielectric resonator, leading to gaps between them and increased nonlinear contact between them, thus reducing filter performance.

[0047] Therefore, the embodiment of the present application provides a filter, in which the dielectric resonator and the cover plate are relatively fixed by fasteners, so that the cover plate and the dielectric resonator can fit very stably, tightly and reliably, thereby improving the performance indicators of the filter.

[0048] The following describes in detail the various embodiments of the present application with reference to the accompanying drawings:

[0049] Please also refer to Figures 1 to 3 The filter provided in the embodiment of the present application includes a cavity 10, a cover plate 20, a dielectric resonator 30 and a fastener 40. The cover plate 20 covers the cavity 10 and is provided with a first hole 201 therethrough. The dielectric resonator 30 is disposed in the cavity 10 and is abutted against the cover plate 20. A second hole 301 is provided at one end of the dielectric resonator 30 facing the cover plate 20, and the second hole 301 is opposite to the first hole 201. The fastener 40 is sequentially passed through the first hole 201 and the second hole 301, and is locked in the second hole 301 to fix the dielectric resonator 30 and the cover plate 20 relative to each other along the through-going direction of the first hole 201.

[0050] The cavity 10 refers to a physical structure having a cavity inside, and the cavity inside the cavity 10 includes a resonant cavity 60. The cavity 10 is a metal part.

[0051] The cover plate 20 covers the cavity 10 , especially the resonant cavity 60 , to achieve a signal shielding function and prevent signal leakage as much as possible, thereby forming a complete and effective filtering channel.

[0052] The first hole 201 is a through hole that penetrates the cover plate 20. The direction in which the first hole 201 penetrates the cover plate 20 is parallel to Figure 1 and Figure 3 The direction Y indicated in FIG. 1 is parallel to the thickness direction of the cover plate 20 and the distribution direction of the cover plate 20 and the dielectric resonator 30 .

[0053] The dielectric resonator 30 is a resonant structure including dielectric material, so that the dielectric resonator 30 needs to reliably support the cover plate 20. The dielectric resonator 30 can be of various types. In one possible design, Figure 3 As shown, a portion of the dielectric resonator 30 is made of dielectric material, for example, the dielectric resonator 30 is a metal resonant rod loaded with dielectric, a sheet metal resonant rod loaded with dielectric, etc. In another possible design, as shown in FIG. Figure 7 As shown, the dielectric resonator 30 is essentially made of a dielectric material. For example, the dielectric resonator 30 is a ceramic dielectric resonator rod or other dielectric resonator rod. Of course, the dielectric resonator 30 can also be other types of resonant structures. The dielectric material can be a dielectric material having a relative dielectric constant greater than that of air. For example, the dielectric material includes one or more of ceramic, magnesium oxide, titanium dioxide, zinc oxide, aluminum oxide, calcium carbonate, silicon dioxide, samarium trioxide, aluminum trioxide, and strontium carbonate.

[0054] The dielectric resonator 30 may be connected to the cavity 10 by integral connection, welding, crimping, riveting, screw fastening, threaded connection, or the like.

[0055] It should be noted that the fastener 40 sequentially penetrates the first hole 201 and the second hole 301 and is locked within the second hole 301. Furthermore, the fastener 40 positions the cover plate 20 at least in the direction toward the dielectric resonator 30. That is, the fastener 40 at least positions the cover plate 20 away from the dielectric resonator 30, thereby limiting the movement of the cover plate 20 away from the dielectric resonator 30. Specifically, the fastener 40 positions the cover plate 20 at least in the direction Y toward the dielectric resonator 30, and the fastener 40 and the dielectric resonator 30 are relatively fixed along at least any direction parallel to the direction Y. Thus, in the direction through which the first hole 201 passes, the fastener 40 and the dielectric resonator 30 are relatively fixed, and the fastener 40 presses the cover plate 20 toward the dielectric resonator 30, so that the cover plate 20 is limited to the fastener 40 at least in the direction away from the dielectric resonator 30. That is, the fastener 40 acts to relatively fix the dielectric resonator 30 and the cover plate 20 along the through-direction of the first hole 201, thereby limiting the back-movement of the dielectric resonator 30 and the cover plate 20. This allows the fastener 40 and the cover plate 20 to fit together in the through-direction of the first hole 201, ensuring a stable, tight, and reliable fit between the fastener 40 and the cover plate 20. In one possible design, the fastener 40 includes a portion that positions the cover plate 20 in the direction toward the dielectric resonator 30. In another possible design, the fastener 40 is locked within the first hole 201, thereby relatively fixing the fastener 40 and the cover plate 20 in the through-direction of the first hole 201. In yet another possible design, the fastener 40 includes a portion that positions the cover plate 20 in the direction toward the dielectric resonator 30 and is simultaneously locked within the first hole 201.

[0056] The fastener 40 is an insulating structure, that is, the fastener 40 can be made of insulating materials such as plastic, so as to avoid the problem of the fastener 40 causing the filter to short-circuit.

[0057] In one possible design, the fastener 40 is made of a dielectric material (e.g., ceramic), and the dielectric material used in the fastener 40 is the same as the dielectric material of the dielectric resonator 30. Alternatively, the relative dielectric constant of the fastener 40 is the same as the relative dielectric constant of the dielectric resonator 30. Based on this, it is equivalent to adding a loading medium within the resonant cavity 60, and the relative dielectric constant of the loading medium in the resonant cavity 60 can be effectively maintained stable, which can reduce the resonant frequency within the resonant cavity 60, thereby achieving a wideband filter and increasing the bandwidth. Of course, in another possible design, the dielectric material used in the fastener 40 can also be different from the dielectric material of the dielectric resonator 30.

[0058] The second hole 301 and the first hole 201 are arranged opposite to each other along the through direction of the first hole 201 and are connected, so that the fastener 40 can be sequentially passed through the first hole 201 and the second hole 301 along the through direction of the first hole 201. In a possible design, as Figure 3 As shown, the second hole 301 is a countersunk hole, that is, the second hole 301 does not penetrate the dielectric resonator 30 along the penetration direction of the first hole 201. In another possible design, as shown in FIG. Figure 7 As described above, the second hole 301 passes through the dielectric resonator 30 along the penetrating direction of the first hole 201 .

[0059] The number of dielectric resonators 30 can be one or more. When there are multiple dielectric resonators 30, the multiple dielectric resonators 30 are spaced apart, and the cover plate 20 defines multiple first holes 201 spaced apart. The multiple first holes 201 are arranged one-to-one with the multiple second holes 301 of the dielectric resonators 30. Furthermore, the aforementioned fastener 40 is inserted through the second hole 301 of at least one dielectric resonator 30 and the corresponding first hole 201.

[0060] The filter provided in the embodiment of the present application, by inserting the fastener 40 through the first hole 201 of the cover plate 20 and locking it to the second hole 301 of the dielectric resonator 30, can relatively fix the dielectric resonator 30 and the cover plate 20 along the through-direction of the first hole 201. That is, the fastener 40 fixes the cover plate 20 to the dielectric resonator 30 along the through-direction of the first hole 201. In this way, under the action of the fastener 40, the cover plate 20 and the dielectric resonator 30 can be stably, tightly, and reliably fitted along the through-direction of the first hole 201. This can alleviate the problem of a certain gap between the dielectric resonator 30 and the cover plate 20, and can also reduce the nonlinear contact between the cover plate 20 and the dielectric resonator 30, thereby ensuring that the current inside the resonant cavity 60 can have a high degree of consistency, effectively reducing insertion loss and intermodulation, and improving the performance indicators of the filter.

[0061] It should be noted that the fastener 40 is sequentially inserted through the first hole 201 and the second hole 301 and locked in the second hole 301 to achieve relative fixation between the cover plate 20 and the dielectric resonator 30. This ensures a very stable, tight, and reliable abutment between the cover plate 20 and the dielectric resonator 30, and prevents the elastic properties of the spring from failing, thereby reducing the fit between the dielectric resonator 30 and the cover plate 20. Therefore, compared to solutions that use springs to improve the fit between the cover plate 20 and the dielectric resonator 30, the present solution achieves a more reliable and stable fit between the dielectric resonator 30 and the cover plate 20, and the stable fit between the dielectric resonator 30 and the cover plate 20 can be maintained over the long term.

[0062] It should also be noted that in the scheme of using spring clips to improve the fit between the cover plate 20 and the dielectric resonator 30, on the one hand, the spring clips need to be assembled on the cover plate 20, and the assembly process of the spring clips is very complex, tedious and time-consuming; on the other hand, the cover plate 20 needs to be complexly processed so that the cover plate 20 can adapt to the spring clips. This makes the assembly process of the filter very complicated, which in turn reduces the production efficiency of the filter. In addition, it is necessary to add equipment for assembling the spring clips to the cover plate 20, which increases the production cost of the filter. In the filter provided in the embodiment of the present application, the fastener 40 is sequentially inserted into the first hole 201 and the second hole 301 and locked in the second hole 301, so that a stable, tight and reliable fit between the cover plate 20 and the dielectric resonator 30 can be achieved. For example, a fastener 40 similar to a bolt or screw can be used to be inserted into the first hole 201 and the second hole 301, and the assembly process is very simple and easy to implement. Furthermore, there is no need to perform complex processing on the cover plate 20; instead, only a simple hole opening process is required on the cover plate 20. This makes the filter assembly process very simple, easy to implement, and time-saving. It also eliminates the need for equipment for assembling the spring plate to the cover plate 20, reducing the production cost of the filter.

[0063] In some embodiments, the fastener 40 is threadedly fitted or interference fit with the first hole 201 .

[0064] When fastener 40 is threadedly engaged with first hole 201, first hole 201 is configured as a circular, internally threaded hole. Fastener 40 can be configured similarly to a bolt, with the portion of fastener 40 inserted into first hole 201 being cylindrical and having external threads on its outer circumference. Thus, by screwing fastener 40 into first hole 201, threaded engagement between fastener 40 and first hole 201 is achieved.

[0065] When the fastener 40 forms an interference fit with the first hole 201, the first hole 201 may be a circular hole, a square hole, a polygonal hole, etc., and the cross-section of the portion of the fastener 40 that passes through the first hole 201 may be correspondingly circular, square, polygonal, etc. The cross-section of the fastener 40 is perpendicular to the through-direction of the first hole 201. The fastener 40 may be configured as a screw-like structure, and an interference fit between the fastener 40 and the first hole 201 may be achieved by forcefully inserting the fastener 40 into the first hole 201.

[0066] The fastener 40 is threadedly or interference-fitted with the first hole 201 so that the fastener 40 can be locked in the first hole 201 when it is inserted into the first hole 201, so that the fastener 40 and the cover plate 20 are relatively fixed in the through-direction of the first hole 201. Based on this, the fastener 40 can be locked in the first hole 201 and the second hole 301 by being inserted into the first hole 201 and the second hole 301 in sequence, so as to achieve relative fixation of the dielectric resonator 30 and the cover plate 20 in the through-direction of the first hole 201, thereby achieving a reliable, tight and stable fitting effect between the dielectric resonator 30 and the cover plate 20, thereby reducing the intermodulation and insertion loss of the filter and making the filter have higher performance indicators. In addition, the process of inserting the fastener 40 into the first hole 201 is very simple, easy to implement, and time-saving, making the filter assembly process very simple and efficient.

[0067] In addition, the fastener 40 and the cover plate 20 may also be fixed by other means, such as snap fastening.

[0068] In some embodiments, the fastener 40 is threadedly fitted or interference fit with the second hole 301 .

[0069] It should be noted that the matching scheme of the fastener 40 and the second hole 301 is similar to the matching scheme of the fastener 40 and the first hole 201 , and the specific situation can be referred to, and will not be repeated here.

[0070] The fastener 40 is threadedly or interference-fitted with the second hole 301, so that the fastener 40 and the cover plate 20 are relatively fixed in the through-direction of the first hole 201 when the fastener 40 is inserted into the second hole 301. The process of locking the fastener 40 into the second hole 301 is very simple, easy to implement, and time-saving, making the filter assembly process very simple and efficient.

[0071] It should also be noted that while the fastener 40 is threadedly engaged with the first hole 201, the fastener 40 can also be threadedly engaged with the second hole 301. This facilitates the structural design of the fastener 40 and simplifies the locking operation of the fastener 40 with the first hole 201 and the second hole 301, respectively. Of course, the fastener 40 can also be an interference fit with the second hole 301. While the fastener 40 is an interference fit with the first hole 201, the fastener 40 can also be an interference fit with the second hole 301. This facilitates the structural design of the fastener 40 and simplifies the locking operation of the fastener 40 with the first hole 201 and the second hole 301, respectively. Of course, the fastener 40 can also be threadedly engaged with the second hole 301.

[0072] In some embodiments, please refer to Figure 2 and Figure 3The fastener 40 includes a fastening portion 41 and a first stopper 42. The first stopper 42 is disposed on the outer periphery of the fastening portion 41, specifically, on the outer periphery of the fastening portion 41 in the direction through which the first hole 201 is penetrated. The fastening portion 41 passes through the first hole 201 and is locked in the second hole 301. The cover plate 20 is restrained by the first stopper 42 in a direction away from the dielectric resonator 30.

[0073] It should be noted that when the fastening portion 41 is sequentially inserted into the first hole 201 and the second hole 301 and locked in the second hole 301, the first limiting portion 42 can be located on the side of the cover plate 20 away from the dielectric resonator 30 and abuts against the side of the cover plate 20 away from the dielectric resonator 30, so that the first limiting portion 42 limits the cover plate 20 in the direction toward the dielectric resonator 30. In this way, the first limiting portion 42 limits the position of the cover plate 20 in the direction away from the dielectric resonator 30, so that the cover plate 20 is limited to the first limiting portion 42 in the direction away from the dielectric resonator 30, and further, the first limiting portion 42 limits the movement of the cover plate 20 in the direction away from the dielectric resonator 30. In this way, with the fastening portion 41 locked with the second hole 301 and the first limiting portion 42 limiting the cover plate 20 toward the dielectric resonator 30, the cover plate 20 can be pressed toward the dielectric resonator 30 and tightly adhered to the dielectric resonator 30.

[0074] It should also be noted that in the scheme of using a spring sheet to improve the fit between the cover plate 20 and the dielectric resonator 30, the multiple elastic petals of the spring sheet are used to jointly press the cover plate 20. However, it is difficult to maintain completely consistent elastic force between the multiple elastic petals. As a result, the pressures on the various positions of the cover plate 20 corresponding to the dielectric resonator 30 are different, and thus the pressures on the various positions of the dielectric resonator 30 are also different, resulting in poor stability and fit between the cover plate 20 and the dielectric resonator 30. In this scheme, however, because the first limiting portion 42 is provided on the outer peripheral side of the fastening portion 41 in the through-direction of the first hole 201, and the fastening portion 41 is provided through the first hole 201 and the second hole 301, the first limiting portion 42 can press against the outer peripheral position of the cover plate 20 corresponding to the second hole 301. In this way, the cover plate 20 can be pressed against the dielectric resonator 30 at the periphery of the second hole 301 by the first stopper 42, ensuring that the dielectric resonator 30 receives a very stable and uniform pressure at the periphery of the second hole 301. This ensures a very stable and reliable fit between the cover plate 20 and the dielectric resonator 30, thereby improving the performance of the filter.

[0075] It should also be noted that, in this embodiment, the fastening portion 41 may be clearance-fitted with the first hole 201 , or may be thread-fitted with the first hole 201 or have an interference fit.

[0076] Based on the above structure, in one possible design, the fastening portion 41 is threadedly engaged with the second hole 301, and the first limiting portion 42 limits the cover plate 20. In this case, the fastener 40 is a bolt. In another possible design, the fastening portion 41 has an interference fit with the second hole 301, and the first limiting portion 42 limits the cover plate 20. In this case, the fastener 40 is a screw. The fastening portion 41 can have a clearance fit, an interference fit, or an interference fit with the first hole 201.

[0077] In some embodiments, please refer to Figures 2 to 5 、 Figure 7 A plurality of first protrusions 321 spaced apart from each other are provided at one end of the dielectric resonator 30 facing the cover plate 20 , and each first protrusion 321 abuts against the cover plate 20 .

[0078] It can be understood that the dielectric resonator 30 abuts against the cover plate 20 via a plurality of first protrusions 321 distributed at intervals.

[0079] Compared to a solution without the first protrusions 321, this solution uses multiple spaced-apart first protrusions 321 to support the cover plate 20, reducing the area of ​​the dielectric resonator 30 used to support the cover plate 20. This makes it easier for the portion of the cover plate 20 pressing against the dielectric resonator 30 to deform. This reduces the contact area between the cover plate 20 and the dielectric resonator 30, improving the contact between the cover plate 20 and the dielectric resonator 30. Specifically, the portion of the cover plate 20 in contact with the first protrusions 321 is pressed flatter by the first protrusions 321, reducing gaps and nonlinear contact between the dielectric resonator 30 and the cover plate 20 caused by uneven contact surfaces. This helps improve the reliability and stability of the fit between the dielectric resonator 30 and the cover plate 20, thereby reducing the insertion loss and intermodulation of the filter and improving the performance of the filter.

[0080] In some embodiments, see Figure 5 , and in combination with other drawings, the first protrusions 321 are evenly distributed around the outer circumference of the second hole 301 , which helps to improve the stability and reliability of the fitting between the cover plate 20 and the dielectric resonator 30 .

[0081] In some embodiments, please refer to Figures 2 to 5 The dielectric resonator 30 is a metal resonant rod loaded with a dielectric. Specifically, the dielectric resonator 30 includes a metal resonant rod 31 and a dielectric member 32. The metal resonant rod 31 is disposed within the cavity 10, and the dielectric member 32 is disposed between the end of the metal resonant rod 31 facing the cover plate 20 and the cover plate 20. In the through-direction of the first hole 201, the dielectric member 32 has two opposing ends. One end of the dielectric member 32 abuts against the end of the metal resonant rod 31 facing the cover plate 20, while the other end of the dielectric member 32 abuts against the cover plate 20.

[0082] The metal resonant rod 31 can be designed in various types. In some possible designs, the metal resonant rod 31 is a metal piece, that is, the dielectric resonant element 30 is a metal resonant rod loaded with a dielectric.

[0083] The metal resonance rod 31 can be fixedly connected to the cavity 10 by welding, crimping, riveting, screw fastening, threaded connection, etc., or the metal resonance rod 31 can also be integrally formed with the cavity 10.

[0084] It should be noted that, in the through-direction of the first hole 201, a metal layer, such as silver, is provided at opposite ends of the dielectric member 32, and one end of the dielectric member 32 abuts against the metal resonant rod 31 through the metal layer, while the other end of the dielectric member 32 abuts against the cover plate 20 through the metal layer. The dielectric member 32 is made of a dielectric material, such as a ceramic dielectric member.

[0085] In some embodiments, the fastener 40 is made of a dielectric material (such as ceramic), and the dielectric material used in the fastener 40 is the same as the dielectric material used in the dielectric member 32, or the relative dielectric constant of the fastener 40 is the same as the relative dielectric constant of the dielectric member 32. Based on this, it is equivalent to adding a loading medium in the resonant cavity 60, and can effectively maintain the stability of the relative dielectric constant of the loading medium in the resonant cavity 60, which can reduce the resonant frequency in the resonant cavity 60, which is conducive to achieving broadband filter and increasing bandwidth.

[0086] The second hole 301 can be opened at various positions. In some possible designs, such as Figures 2 to 5 As shown, the second hole 301 is simultaneously provided in the metal resonant rod 31 and the dielectric member 32. The second hole 301 of the dielectric member 32 penetrates the dielectric member 32 along the penetration direction of the first hole 201. The second hole 301 of the metal resonant rod 31 is provided at the end of the metal resonant rod 31 facing the dielectric member 32, and the second hole 301 of the metal resonant rod 31 is a countersunk hole or a through hole. The fastener 40 is locked in the second hole 301 of the dielectric member 32, or the fastener 40 is locked in the second hole 301 of the metal resonant rod 31, or the fastener 40 is simultaneously locked in the second hole 301 of the dielectric member 32 and the second hole 301 of the metal resonant rod 31. In other possible designs, the second hole 301 is provided at the end of the dielectric member 32 facing the cover plate 20, and the second hole 301 is a countersunk hole or a through hole. The fastener 40 is locked in the second hole 301 of the dielectric member 32. In some other possible designs, the second hole 301 is formed at one end of the metal resonant rod 31 facing the dielectric member 32 , and the second hole 301 is a countersunk hole or a through hole. The fastener 40 is locked in the second hole 301 of the metal resonant rod 31 .

[0087] By using a dielectric resonator 30 as a metal resonant rod 31 loaded with dielectric, a dielectric member 32 is placed between the metal resonant rod 31 and the cover plate 20. This dielectric member 32 replaces the air between the metal resonant rod 31 and the cover plate 20 as the medium for electromagnetic wave transmission. This arrangement increases the relative dielectric constant of the medium between the metal resonant rod 31 and the cover plate 20, which reduces the energy loss of the filter and helps lower the resonant frequency of the resonant cavity 60, thereby achieving a low frequency.

[0088] It should be supplemented here that when the dielectric resonator 30 is a metal resonant rod 31 loaded with a dielectric, the first protrusion 321 is a part of the dielectric member 32 , and the first protrusion 321 is provided at one end of the dielectric member 32 facing the cover plate 20 .

[0089] It should be additionally explained that the cross-sections of the metal resonant rod 31 and the dielectric member 32 perpendicular to the through-direction of the first hole 201 may be circular, elliptical, square, polygonal or other shapes.

[0090] In some embodiments, please refer to Figures 2 to 5 The second hole 301 includes a first section 3011 and a second section 3012. The first section 3011 passes through the dielectric member 32 and is opposite to the first hole 201. The second section 3012 is provided at one end of the metal resonant rod 31 facing the dielectric member 32 and is opposite to the first section 3011.

[0091] As can be understood, the second hole 301 is provided in both the metal resonant rod 31 and the dielectric member 32. Specifically, the second hole 301 includes a first section 3011 and a second section 3012. The second hole 301 provided in the dielectric member 32 is the first section 3011 of the second hole 301, which penetrates the dielectric member 32 along the direction of penetration of the first hole 201. The second hole 301 provided in the metal resonant rod 31 is the second section 3012 of the second hole 301, which is provided at the end of the metal resonant rod 31 facing the dielectric member 32. The first hole 201, the first section 3011 of the second hole 301, and the second section 3012 of the second hole 301 are sequentially distributed along the direction of penetration of the first hole 201. The first hole 201 is opposite and connected to the first section 3011, and the second section 3012 is opposite and connected to the first section 3011.

[0092] Among some possible designs, such as Figure 3 As shown, the second section 3012 is a countersunk hole opened at one end of the metal resonant rod 31 facing the dielectric member 32. In other possible designs, the second section 3012 passes through the metal resonant rod 31 along the penetrating direction of the first hole 201.

[0093] Among some possible designs, such as Figure 3As shown, the fastener 40 is inserted into the first section 3011 and the second section 3012 of the second hole 301. The fastener 40 is locked in the first section 3011 and has a clearance fit with the second section 3012; or Figure 3 As shown, the fastener 40 is locked in the second section 3012 and has a clearance fit with the first section 3011; alternatively, the fastener 40 is locked in both the first section 3011 and the second section 3012. In other possible designs, the fastener 40 is only inserted into the first section 3011 of the second hole 301 and locked in the first section 3011.

[0094] Because both the dielectric member 32 and the metal resonant rod 31 have second holes 301, with the second hole 301 in the dielectric member 32 being the first section 3011 of the second hole 301 and the second hole 301 in the metal resonant rod 31 being the second section 3012 of the second hole 301, the fastener 40 can be inserted through at least the first section 3011 of the second hole 301. Thus, the first stopper 42 located on the outer periphery of the fastening portion 41 can correspond to the outer periphery of the dielectric member 32 around the first section 3011, allowing the first stopper 42 to press against the outer periphery of the cover plate 20 corresponding to the first section 3011. Furthermore, the first stopper 42 can indirectly apply uniform pressure to the outer periphery of the dielectric member 32 around the first section 3011 through the cover plate 20, thereby providing more uniform pressure on the dielectric member 32 around the first section 3011. This facilitates a stable and tight fit between the dielectric member 32 and the cover plate 20, thereby improving filter performance.

[0095] It is necessary to add that, if Figure 3 As shown, the fastener 40 is inserted through the first section 3011 and the second section 3012 of the second hole 301. Specifically, the fastener 40 is inserted only through the first section 3011 of the second hole 301 and locked to the second section 3012. Furthermore, the metal resonant rod 31 is fixed to the cavity 10. With this arrangement, the fastener 40 can achieve relative fixation between the cover plate 20 and the metal resonant rod 31 in the direction through the first hole 201, so that the opposite ends of the dielectric member 32 in the direction through the first hole 201 respectively abut against the cover plate 20 and the metal resonant rod 31. In other words, the cover plate 20 and the metal resonant rod 31 respectively press against the opposite ends of the dielectric member 32 in the direction through the first hole 201. In this way, the opposite ends of the dielectric member 32 in the direction through the first hole 201 can reliably and tightly abut the cover plate 20 and the metal resonant rod 31, respectively, achieving a better abutting effect.

[0096] In some embodiments, please refer to Figures 2 to 5 A plurality of second protrusions 322 are provided at one end of the dielectric member 32 away from the cover plate 20 , and the second protrusions 322 are supported on the metal resonant rod 31 .

[0097] It can be understood that the dielectric member 32 supports the metal resonance rod 31 through a plurality of second protrusions 322 distributed at intervals.

[0098] The second protrusion 322 is a portion of the dielectric member 32, made of dielectric material. It is understood that the dielectric member 32 also includes a first main body 323, with a first protrusion 321 and a second protrusion 322 disposed at opposite ends of the first main body 323 in the direction through which the first hole 201 passes. The first section 3011 of the second hole 301 passes through the first main body 323. The number, arrangement, and shape of the second protrusions 321 may be the same as or different from those of the first protrusions 322.

[0099] Compared to a solution without the second protrusions 322, this solution uses multiple spaced-apart second protrusions 322 to support the metal resonant rod 31, reducing the area of ​​the dielectric member 32 used to support the metal resonant rod 31. This makes it easier for the metal resonant rod 31 to deform at the location where it presses against the dielectric member 32 when the metal resonant rod 31 is supported. This reduces the contact area between the metal resonant rod 31 and the dielectric member 32, improving the contact between the metal resonant rod 31 and the dielectric member 32. Specifically, the contact area between the metal resonant rod 31 and the dielectric member 32 is pressed flatter by the second protrusions 322, reducing gaps and nonlinear contact between the dielectric member 32 and the metal resonant rod 31 caused by uneven contact surfaces. This helps improve the reliability and stability of the fit between the dielectric member 32 and the metal resonant rod 31, thereby reducing the insertion loss and intermodulation of the filter and improving the performance of the filter.

[0100] In some embodiments, please refer to Figures 2 to 6 The dielectric resonator 30 further includes a limiting member 33 , which includes a limiting sleeve 331 and a plurality of second limiting portions 332 . The plurality of second limiting portions 332 are spaced apart and arranged in the limiting sleeve 331 .

[0101] like Figure 6 As shown, the limiting sleeve 331 is a sleeve-shaped structure, and a plurality of second limiting portions 332 are distributed at intervals on the inner circumference of the limiting sleeve 331 .

[0102] Among some possible designs, such as Figures 2 to 6As shown, the limiting sleeve 331 is mounted on the outside of the end of the metal resonant rod 31 facing the dielectric member 32, and is also mounted on the outside of the end of the dielectric member 32 facing the metal resonant rod 31. In this way, the outer circumference of the metal resonant rod 31 and the outer circumference of the dielectric member 32 can both abut against the inner circumference of the limiting sleeve 331. The inner circumference of the limiting sleeve 331 can limit the movement of the metal resonant rod 31 and the dielectric member 32 in a direction perpendicular to the through-hole 201, as well as the swing relative to the through-hole 201. In other possible designs, the limiting sleeve 331 can be mounted only on the outside of the end of the metal resonant rod 31 facing the dielectric member 32. In still other possible designs, the limiting sleeve 331 can be mounted only on the outside of the end of the dielectric member 32 facing the metal resonant rod 31.

[0103] The second limiting portion 332 is provided at one end of the metal resonant rod 31 facing the dielectric member 32. Specifically, the second limiting portion 332 is provided between the end of the metal resonant rod 31 facing the dielectric member 32 and the end of the first main body 323 of the dielectric member 32 facing the metal resonant rod 31.

[0104] The second limiting portion 332 is disposed between two adjacent second protrusions 322. Specifically, multiple second limiting portions 332 are spaced apart along the circumference of the limiting sleeve 331, and any second protrusion 322 of the dielectric member 32 can be positioned between two adjacent second limiting portions 332. Thus, any two adjacent second limiting portions 332 can limit the second protrusion 322 between them, thereby limiting the rotation of the dielectric member 32 about the through-going direction of the first hole 201.

[0105] By adopting the above technical solution, the limiting member 33 can limit the position of the dielectric member 32, specifically limiting the movement of the dielectric member 32 in a direction perpendicular to the through-direction of the first hole 201, the swing of the dielectric member 32 relative to the through-direction of the first hole 201, and the rotation of the dielectric member 32 about the through-direction of the first hole 201. Therefore, the assembly stability of the metal resonant rod 31 and the dielectric member 32 in the cavity 10 can be improved, thereby improving the fit between the dielectric member 32 and the metal resonant rod 31 and the fit between the dielectric member 32 and the cover plate 20, thereby improving the performance indicators of the filter.

[0106] In some embodiments, see Figure 7 , and in combination with other drawings, the dielectric resonator 30 includes a dielectric resonant rod 34 , and one end of the dielectric resonant rod 34 away from the cover plate 20 is abutted against the cavity 10 .

[0107] like Figure 7As shown, the dielectric resonant rod 34 has two opposite ends along the through-direction of the first hole 201. One end of the dielectric resonant rod 34 faces the cover plate 20 and abuts against the cover plate 20, while the other end of the dielectric resonant rod 34 abuts against the end of the cavity 10 opposite the cover plate 20. A metal layer, such as silver, can be provided at both opposite ends of the dielectric resonant rod 34 along the through-direction of the first hole 201, and the metal layer abuts against the corresponding cover plate 20 and cavity 10.

[0108] In some possible designs, the dielectric resonant rod 34 is a ceramic dielectric resonant rod. In other possible designs, depending on the choice of dielectric material, the dielectric resonant rod 34 may also be a resonant rod made of other dielectrics, such as quartz.

[0109] By adopting the above technical solution, the dielectric resonator 30 can be a ceramic dielectric resonant rod or other dielectric resonant rods.

[0110] It should be noted that, in this embodiment, when the dielectric resonator 30 is a dielectric resonator rod 34 , the first protrusion 321 is provided at one end of the dielectric resonator rod 3431 facing the cover 20 , and the dielectric resonator rod 34 is supported against the cover 20 by the first protrusion 321 .

[0111] It should be noted that the second hole 301 is formed in the dielectric resonant rod 34. Figure 7 As shown, the second hole 301 is a through hole, but can also be a countersunk hole.

[0112] In some embodiments, a third protrusion 342 is provided at one end of the dielectric resonance rod 34 away from the cover plate 20 . The third protrusion 342 is a portion of the dielectric resonance rod 34 and is also made of dielectric material.

[0113] This arrangement reduces the contact area between the dielectric resonance rod 34 and the cavity 10, making it easier for the portion of the cavity 10 pressing against the dielectric resonance rod 34 to deform. This reduces the contact area between the dielectric resonance rod 34 and the cavity 10, improving the contact between the cavity 10 and the dielectric resonance rod 34. Specifically, the portion of the cavity 10 in contact with the dielectric resonance rod 34 is pressed flatter by the third protrusion 342, reducing the gap and nonlinear contact between the dielectric resonance rod 34 and the cavity 10, thereby reducing the insertion loss and intermodulation of the filter and improving the performance of the filter. It can be understood that the dielectric resonance rod 34 includes a second main body 341 and the aforementioned first and third protrusions 321 and 342. The first and third protrusions 321 and 342 are respectively located at opposite ends of the second main body 341 along the through-going direction of the first hole 201.

[0114] In some embodiments, please refer to Figures 1 to 3 、 Figure 7 The cover plate 20 is recessed to form a groove 202 , and the groove 202 is arranged around the outer periphery of the cover plate 20 corresponding to the dielectric resonator 30 .

[0115] Among some possible designs, such as Figures 1 to 3 、 Figure 7 As shown, the groove 202 is formed on the side of the cover plate 20 away from the dielectric resonator 30. In other possible designs, the groove 202 may also be formed on the side of the cover plate 20 facing the dielectric resonator 30. In still other possible designs, the groove 202 may be formed on both the side of the cover plate 20 away from the dielectric resonator 30 and the side of the cover plate 20 facing the dielectric resonator 30.

[0116] As can be understood, the cover plate 20 is recessed to form a groove 202, so that the thickness of the cover plate 20 at the groove 202 is less than the thickness at other locations on the cover plate 20, making it easier for the cover plate 20 to deform at the groove 202. This arrangement facilitates deformation of the cover plate 20 at the groove 202, and the position of the cover plate 20 corresponding to the dielectric resonator 30 can better move toward the dielectric resonator 30. In other words, it is easier for the cover plate 20 to press tightly against the dielectric resonator 30, thereby forming a very stable and reliable tight fit with the dielectric resonator 30. This helps reduce the insertion loss and intermodulation of the filter, thereby improving the performance of the filter.

[0117] In some embodiments, please refer to Figures 1 to 4 、 Figure 7 The filter further includes a tuning element 50. A third hole 203 is formed through the cover plate 20, spaced apart from the first hole 201. The tuning element 50 extends through the third hole 203 to extend into the cavity 10. The length of the tuning element 50 extending into the cavity 10 is adjustable. The tuning element 50 is a metal component; however, in other embodiments, the tuning element 50 may be made of a dielectric material such as ceramic.

[0118] In some possible designs, the tuning element 50 can be a tuning screw, and the third hole 203 can be a threaded hole. The tuning screw is threadedly engaged with the third hole 203, and by rotating the tuning screw, the length of the tuning screw extending into the cavity 10 can be adjusted. Of course, the length of the tuning element 50 extending into the cavity 10 can also be adjusted by other methods.

[0119] By adopting the above technical solution, the tuning effect of the filter can be achieved by adjusting the length of the tuning element 50 extending into the cavity 10; and based on the spacing distribution between the third hole 203 and the first hole 201, the tuning element 50 can accordingly avoid the dielectric resonator 30 and the fastener 40, avoiding interference with the dielectric resonator 30 and the fastener 40.

[0120] In some embodiments, as Figure 1As shown, the filter further includes a first connector 70 and a second connector (not shown), both of which are provided in the cavity 10. The first connector 70 is the signal output end of the filter, and the second connector is the signal output end of the filter.

[0121] Based on the above concept, an embodiment of the present application further provides a communication device, which includes a filter. The filter in this embodiment is the same as the filter in the previous embodiment. For details, please refer to the relevant description of the filter in the previous embodiment, which will not be repeated here.

[0122] The communication device may be a duplexer, or a radio frequency device such as a splitter, a combiner, or a tower-mounted amplifier. Specifically, the filter is provided in the signal receiving circuit of the communication device to perform signal filtering and signal selection.

[0123] The communication device provided in the embodiment of the present application, due to the use of the filters involved in the above embodiments, can also make the cover plate 20 and the dielectric resonator 30 fit stably, reliably and tightly along the through-direction of the first hole 201, so that the current inside the resonant cavity 60 can have a high consistency, which can effectively reduce the insertion loss and intermodulation of the filter and improve the performance indicators of the communication device.

[0124] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A filter, characterized in that: include: cavity; a cover plate, covering the cavity and having a first hole therethrough; a dielectric resonator disposed in the cavity and abutting against the cover plate; a second hole opposite to the first hole is provided at one end of the dielectric resonator facing the cover plate; a fastener, passed through the first hole and locked in the second hole, so as to relatively fix the dielectric resonator and the cover plate along a penetrating direction of the first hole; In the through direction of the first hole, the fastener is relatively fixed to the dielectric resonator, and the fastener presses the cover plate toward the dielectric resonator; The dielectric resonator includes a metal resonant rod and a dielectric member, the metal resonant rod is arranged in the cavity, the dielectric member is arranged between the metal resonant rod and the cover plate, and respectively abuts against the metal resonant rod and the cover plate, and the second hole is opened in the dielectric member and / or the metal resonant rod; or, the dielectric resonator is configured as a dielectric resonant rod, and the end of the dielectric resonant rod away from the cover plate abuts against the cavity.

2. The filter according to claim 1, wherein The fastener is threadedly fitted or interference-fitted with the first hole; and / or the fastener is threadedly fitted or interference-fitted with the second hole.

3. The filter according to claim 1, wherein The fastener includes a fastening portion and a first limiting portion provided on the outer circumference of the fastening portion. The fastening portion passes through the first hole and is locked in the second hole. The cover plate is limited to the first limiting portion in a direction away from the dielectric resonator.

4. The filter according to any one of claims 1 to 3, characterized in that A plurality of first protrusions distributed at intervals are provided on one end of the dielectric resonator facing the cover plate, and the first protrusions abut against the cover plate.

5. The filter according to any one of claims 1 to 3, characterized in that: The second hole comprises: a first section passing through the dielectric member and facing the first hole; The second section is arranged at one end of the metal resonance rod facing the dielectric member and is opposite to the first section; the fastener is locked to the first section and / or the second section.

6. The filter according to any one of claims 1 to 3, characterized in that: A plurality of second protrusions distributed at intervals are provided on one end of the dielectric member away from the cover plate, and the second protrusions are supported by the metal resonance rod.

7. The filter according to claim 6, characterized in that The dielectric resonator further includes a limiting member, and the limiting member includes: A limiting sleeve, sleeved outside the dielectric member and / or outside the metal resonant rod; A plurality of second limiting portions are arranged at intervals in the limiting sleeve; the second limiting portion is arranged at one end of the metal resonance rod facing the dielectric member and between two adjacent second convex portions.

8. The filter according to any one of claims 1 to 3, characterized in that: The cover plate is recessed to form a groove, and the groove is arranged around the outer circumference of a position of the cover plate corresponding to the dielectric resonator.

9. The filter according to any one of claims 1 to 3, characterized in that: The filter further includes a tuning element. The cover plate is provided with a third hole spaced apart from the first hole. The tuning element passes through the third hole to extend into the cavity. The length of the tuning element extending into the cavity is adjustable.

10. A communication device, characterized in that: Comprising the filter according to any one of claims 1-9.

Images