CN111384488A - Dielectric resonator, dielectric filter and communication equipment - Google Patents

Abstract

The application provides a dielectric resonator, dielectric filter and communication equipment, this dielectric resonator includes the dielectric block, nut and tuning screw, be provided with the tuning hole on the surface of dielectric block, the tuning screw divides into first pole section and second pole section along the axis direction of tuning hole, the cross section of first pole section perpendicular to axis direction is less than the cross section of second pole section perpendicular to axis direction, with reduce the clearance between tuning screw and the dielectric block, so not only can avoid the electromagnetic field in the dielectric resonator to reveal, can also increase the axiality between tuning screw and the dielectric block, thereby improve tuning screw's regulation precision.

Description

Dielectric resonator, dielectric filter and communication equipment

Technical Field

The present application relates to the field of wireless communication technologies, and in particular, to a dielectric resonator, a dielectric filter, and a communication device for a 5G communication system.

Background

At present, wireless communication technology is rapidly developed, and a wireless communication system needs a high-performance dielectric filter, and the main functions of the dielectric filter are frequency selection and filtering. In the 5G communication system, since the number of the transmission and reception channels is increased from 8 of the original 4G communication system to 64 or even 128, the dielectric filter of the 5G communication system has the characteristics of miniaturization, high performance and the like.

The inventor of the present application finds, through long-term research, that in the existing dielectric filter, the diameters of the portions of the tuning screws extending into the tuning holes are consistent, so that the gap between the tuning screws and the inner peripheral wall of the tuning holes is large, and electromagnetic wave leakage is easily caused.

Disclosure of Invention

In order to solve the technical problems of the dielectric filter in the prior art, the application provides a dielectric resonator, a dielectric filter and a communication system for a 5G communication system.

In order to solve the above technical problem, the present application provides a dielectric resonator, including:

the tuning structure comprises a dielectric block, a tuning hole and a tuning circuit, wherein one surface of the dielectric block is provided with the tuning hole;

the nut is fixedly arranged relative to the medium block;

the tuning screw rod is inserted in the nut and further extends into the tuning hole, wherein the tuning screw rod is divided into a first rod section and a second rod section along the axis direction of the tuning hole, the cross section of the first rod section perpendicular to the axis direction is smaller than the cross section of the second rod section perpendicular to the axis direction, the first rod section is inserted in the nut, and the second rod section is inserted in the tuning hole.

In order to solve the above technical problem, the present application further provides a dielectric filter, where the dielectric filter includes at least two dielectric resonators, and a coupling structure is disposed between two adjacent dielectric resonators.

In order to solve the above technical problem, the present application further provides a communication device, which includes an antenna and the above dielectric filter, wherein the antenna is coupled to the dielectric filter.

The beneficial effect of this application is: be different from prior art's condition, the dielectric resonator of this application includes the dielectric block, nut and tuning screw, be provided with the tuning hole on the dielectric block's a surface, tuning screw divides into first pole section and second pole section along the axis direction of tuning hole, the cross section of first pole section perpendicular to axis direction is less than the cross section of second pole section perpendicular to axis direction, in order to reduce the clearance between tuning screw and the dielectric block, so not only can avoid the electromagnetic field in the dielectric resonator to reveal, can also increase the axiality between tuning screw and the dielectric block, thereby improve tuning screw's regulation precision.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a first embodiment of a dielectric resonator provided in the present application;

FIG. 2 is a schematic diagram of the structure of the dielectric block of FIG. 1;

FIG. 3 is a schematic top view of the dielectric block of FIG. 2;

fig. 4 is a schematic structural diagram of a second embodiment of a dielectric resonator provided in the present application;

fig. 5 is a schematic structural diagram of a third embodiment of a dielectric resonator provided in the present application;

FIG. 6 is a schematic structural view of another embodiment of the collar and nut of FIG. 4;

fig. 7 is a schematic structural diagram of a fourth embodiment of a dielectric resonator provided in the present application;

FIG. 8 is a schematic view of the tuning screw of FIG. 7;

figure 9 is a schematic diagram of a first embodiment of a dielectric filter provided herein;

fig. 10 is a schematic diagram of a first embodiment of a communication device provided herein.

Detailed Description

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the specification. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments. The terms "first", "second", "third" and "fourth" in the embodiments of the present application are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first," "second," "third," and "fourth" may explicitly or implicitly include at least one such feature. In the description of the embodiments of the present application, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a first embodiment of a dielectric resonator provided in the present application.

Thedielectric resonator 10 of the embodiment of the application is applied to a 5G communication system, and thedielectric resonator 10 includes adielectric block 11, acollar 12, anut 13 and atuning screw 14.

Thedielectric block 11 may be made of a material with light weight, low loss, and high dielectric constant, such as ceramic, glass, or titanate, so that thedielectric resonator 10 has the advantages of small volume, low loss, high frequency, high quality factor, and high temperature stability compared to the conventional metal cavity resonator. Thedielectric block 11 can be in a regular shape such as a cylinder, a cube and the like so as to be convenient for production and processing; in other embodiments, the shape may be irregular, and is not limited herein.

The surface of thedielectric block 11 is covered with a metal layer (not shown in the figure), so that the electromagnetic field is confined inside the dielectric block to form standing wave oscillation because the tangential electric field of the metal layer is zero. Wherein, the material of the metal layer can be silver, copper, aluminum, titanium or gold and other metal materials; for example, the metal material may be powder, and may be coated on the surface of thedielectric block 11 by spraying, evaporation, or electroplating, so as to form a metal layer on the surface of thedielectric block 11; the metal material may be a film, and may be formed by coating the surface of thedielectric block 11 with a metal layer by electric welding, hot pressing, or the like.

Further, as shown in fig. 2, atuning hole 112 is formed on asurface 111 of thedielectric block 11 to change the structure of thedielectric block 11, so that the electromagnetic field in thedielectric block 11 is changed, and the frequency of thedielectric resonator 10 can be changed. In the present embodiment, thetuning hole 112 is a blind hole, and the frequency of thedielectric resonator 10 can be changed by changing the cross-sectional area of thetuning hole 112; alternatively, the frequency of thedielectric resonator 10 is changed by changing the depth of thetuning hole 112. In addition, thetuning hole 112 may be circular in shape and vertically extend from thesurface 111 of thedielectric block 11 toward the inside thereof; in other embodiments, thetuning hole 112 may also be rectangular, oval, etc. in shape, and may also extend from thesurface 111 of thedielectric block 11 to the inside thereof by other extending manners, such as an arch-shaped extension.

Optionally, the inner surface of thetuning hole 112 is processed to remove burrs and oxide layers, so as to avoid the burrs and oxide layers generated during the processing process from affecting the performance of thedielectric resonator 10.

Specifically, thetuning hole 112 is divided into afirst hole section 1121 and asecond hole section 1122 from thesurface 111 in the axial direction of thetuning hole 112, thefirst hole section 1121 being used for accommodating thecollar 12 and thenut 13, and thesecond hole section 1122 being used for accommodating thetuning screw 14. The cross section of thefirst hole segment 1121 perpendicular to the axial direction is larger than the cross section of thesecond hole segment 1122 perpendicular to the axial direction, so that anannular bearing platform 1123 is formed at the connection position of thefirst hole segment 1121 and thesecond hole segment 1122, as shown in fig. 2. The direction indicated by the center line a is the axial direction of thetuning hole 112.

In this embodiment, when thecollar 12 and thenut 13 are received in thefirst hole segment 1121, thecollar 12 is supported on the annular supportingplatform 1123, and thenut 13 is supported on thecollar 12. Compared with the case that thenut 13 is directly supported on theannular bearing platform 1123, in the embodiment, thenut 13 is separated from thedielectric block 11 in the axial direction by thecollar 12, so that thenut 13 interacts with thecollar 12, and thenut 13 can be prevented from damaging theannular bearing platform 1123 in the process of relative rotation between thenut 13 and thedielectric block 11, thereby prolonging the service life of thedielectric resonator 10.

Optionally, the depth of thefirst hole segment 1121 is greater than or equal to the sum of the heights of thecollar 12 and thenut 13, so that the outer end surface of thenut 13 can be flush with or lower than thesurface 111 when thecollar 12 and thenut 13 are received in thefirst hole segment 1121, as shown in fig. 1.

Generally, in the process of assembling thedielectric block 11, thecollar 12, thenut 13 and thetuning screw 14 to form thedielectric resonator 10, thecollar 12 is first disposed in thefirst hole segment 1121 and supported on the annular supportingplatform 1123, thenut 13 is then disposed in thefirst hole segment 1121 and supported on thecollar 12, thetuning screw 14 is then inserted into thecollar 12 and thenut 13 and threadedly engaged with thenut 13, and thetuning screw 14 further extends into thesecond hole segment 1122, as shown in fig. 1.

The existing lantern ring and nut are often arranged on the surface of the dielectric block, so that the dielectric resonator is easy to have larger thickness and larger volume. In this embodiment, the outer end surface of thenut 13 may be flush with thesurface 111 or lower than thesurface 111, as shown in fig. 1, so as to prevent thenut 13 and thetuning screw 14 from protruding out of thedielectric block 11, which not only can reduce the thickness of thedielectric resonator 10 and reduce the volume of thedielectric resonator 10, but also can prevent thecollar 12, thenut 13 and thetuning screw 14 from colliding with other objects, thereby keeping the relative positions of thecollar 12, thenut 13 and thetuning screw 14 and thedielectric block 11 unchanged and further increasing the reliability of thedielectric resonator 10. In other embodiments, when the outer end surfaces of thenut 13 and thetuning screw 14 are higher than thesurface 111, thenut 13 and thetuning screw 14 may be made flush with thesurface 111 by grinding or the like.

Wherein, thecollar 12, thescrew 13 and thetuning screw 14 can be made of metal material, for example, the metal material can be silver, copper, aluminum, titanium or gold; the dielectric resonator can also be made by spraying, evaporating or plating a layer of metal material on the surface of ceramic or other materials, so as to prevent the electromagnetic field in thedielectric resonator 10 from leaking through thelantern ring 12, thescrew 13 and thetuning screw 14, thereby improving the reliability of thedielectric resonator 10.

In the present embodiment, thetuning screw 14 is used to adjust the frequency of thedielectric resonator 10. By using the principle of resonant cavity perturbation, when the cross-sectional area of thetuning hole 112 is fixed, the electromagnetic field in thedielectric block 11 can be changed by adjusting the length of thetuning screw 14 extending into thetuning hole 112, so as to adjust the frequency of thedielectric resonator 10. Wherein, the longer thetuning screw 14 is located in thetuning hole 112, the lower the frequency of thedielectric resonator 10; conversely, the shorter the length of thetuning screw 14 within thetuning bore 112, the higher the frequency of thedielectric resonator 10.

Alternatively, thetuning screw 14 and thecollar 12 may be chamfered or rounded at the sharp corner where the performance of thedielectric resonator 10 is greatly affected.

Referring collectively to fig. 2 and 3, fig. 3 is a top view of thedielectric block 11 of fig. 2.

In this embodiment, thefirst hole section 1121 is further divided into afirst sub-hole section 1124 and asecond sub-hole section 1125 in the axial direction from thesurface 111, thefirst sub-hole section 1124 being close to the surface and adapted to receive thenut 13, and thesecond sub-hole section 1125 being close to thesecond hole section 1122 and adapted to receive thecollar 12.

The cross-sectional shape of thecollar 12 perpendicular to the axial direction is a circular shape, and the cross-sectional shape of thenut 13 perpendicular to the axial direction is a polygonal shape, for example, thenut 13 is a regular hexagon. Accordingly, the cross-sectional shape offirst sub-bore section 1124 perpendicular to the axial direction is a polygonalarrangement matching nut 13, for example, the cross-sectional shape offirst sub-bore section 1124 perpendicular to the axial direction is also a regular hexagon, and the cross-sectional shape ofsecond sub-bore section 1125 perpendicular to the axial direction is a circulararrangement matching collar 12, as shown in fig. 3. This not only increases the structural compactness of thedielectric resonator 10, but also increases the fixing effect of thecollar 12 and thenut 13 in thedielectric block 11, thereby increasing the reliability of thedielectric resonator 10. In other embodiments, the firstsub-hole section 1124 and the secondsub-hole section 1125 may be both polygonal or circular, for example, both circular, and the matching of thecollar 12 and thenut 13 with the firstsub-hole section 1124 and the secondsub-hole section 1125 may also provide thedielectric resonator 10 with better compactness and reliability.

Optionally, the depth of the firstsub-hole section 1124 is greater than or equal to the height of thenut 13, the depth of the secondsub-hole section 1125 is less than or equal to the height of thecollar 12, and the secondsub-hole section 1125 arranged in a circle is inscribed in or less than the firstsub-hole section 1124 arranged in a polygon, as shown in fig. 3, so that when thecollar 12 is accommodated in the secondsub-hole section 1125 and supported on thebearing platform 1123, thecollar 12 partially protrudes from the secondsub-hole section 1125, so that when thenut 13 is accommodated in the firstsub-hole section 1124, thenut 13 can be supported on thecollar 12, which can increase the force bearing area of thenut 13 and avoid the occurrence of abnormal movement of thecollar 12, thereby increasing the reliability and compactness of thedielectric resonator 10.

The present application further provides a second embodiment of the dielectric resonator, which is described on the basis of the dielectric resonator disclosed in the first embodiment. As shown in fig. 4 and 1, the innercircumferential wall 121 of thecollar 12 is smooth.

The internal perisporium of current lantern ring and nut all sets up the screw thread, and in the in-process of adjusting is carried out in the cooperation of tuning screw and nut, it is great to lead to the wearing and tearing volume of tuning screw rod easily to influence dielectric resonator's performance. In this embodiment, the innerperipheral wall 121 of thecollar 12 is designed to be a smooth surface, which can reduce the total number of threads, thereby effectively reducing the wear amount of thetuning screw 14, and avoiding excessive grinding from falling into thetuning hole 112, thereby increasing the reliability of thedielectric resonator 10.

Further, the inner diameter of thecollar 12 is smaller than the inner diameter of thesecond hole section 1122, and thecollar 12 is further provided with anannular flange 122, and theannular flange 122 is used for inserting thecollar 12 into thesecond hole section 1122, so that the contact area of thecollar 12 and the inner peripheral wall of thetuning hole 112 can be increased, and the electromagnetic field leakage in thedielectric resonator 10 can be avoided.

Optionally, a transition fit or an interference fit is formed between thecollar 12 and the inner peripheral wall of thefirst hole segment 1121, and a transition fit or an interference fit is formed between theflange 122 and the inner peripheral wall of thesecond hole segment 1122, so that thecollar 12 and theflange 122 are relatively fixed to thedielectric block 11, and gaps between thecollar 12 and theflange 122 and thedielectric block 11 are reduced, so that the contact between thecollar 12 and theflange 122 and thedielectric block 11 is increased, and further, the electromagnetic field leakage in thedielectric resonator 10 is avoided. In other embodiments where thecollar 12 and thenut 13 are disposed on the surface of thedielectric block 11, thecollar 12 and thenut 13 are not located in thetuning hole 112, and during the process of screwing thenut 13 and thetuning screw 14 together, thecollar 12 can be pressed against thedielectric block 11 by thenut 13, so that thecollar 12 and thedielectric block 11 are relatively fixed.

The present application further provides a third embodiment of the dielectric resonator, which is described on the basis of the dielectric resonator disclosed in the second embodiment. As shown in fig. 5 and fig. 1, the height of thecollar 12 in the axial direction is adjustable, for example, thecollar 12 is made of an electrostrictive material such as piezoelectric ceramic or electroactive polymer, and in the energized state, the height of thecollar 12 in the axial direction is adjustable, so that the actual length of thetuning screw 14 that can extend into thesecond hole section 1122 is changed, and thus thetuning screw 14 has different adjustment depths, thereby increasing the adjustment accuracy of thedielectric resonator 10. In other embodiments, the number of thecollars 12 is multiple, and the heights of thecollars 12 along the axial direction are different, so that thecollars 12 with different heights are selected to support thenut 13 according to different adjustment requirements. Accordingly, the number of the nuts 13 is plural, and the heights of theplural nuts 13 in the axial direction are different, so that thenuts 13 of the corresponding heights are selected according to the selectedcollar 12, so that the overall height of the selectedcollar 12 and the nuts 13 is less than or equal to a preset height value.

It should be noted that the preset height value may be less than or equal to the depth of thefirst hole segment 1121, so that the overall height of thecollar 12 and thenut 13 is selected to be less than or equal to the depth of thefirst hole segment 1121, which can prevent thenut 13 from protruding out of thedielectric block 11, thereby reducing the volume of thedielectric resonator 10 and increasing the reliability of thedielectric resonator 10.

Threads are arranged on the inner peripheral walls of the existing lantern ring and the nut, so that the adjusting depth of the tuning screw is fixed; for example, the adjustment depth may be the depth of the tuning hole or the length of the tuning screw, which easily results in a small adjustment range of the tuning screw, resulting in low adjustment accuracy of the dielectric resonator. The innerperipheral wall 121 of thecollar 12 in this embodiment is a smooth surface, so that the actual threads of thecollar 12 and thenut 13 are only the threads of thenut 13, and the actual length of thetuning screw 14 that can extend into thesecond hole section 1122 should also be reduced by the height of thecollar 12. Therefore, under the condition that the overall height of thecollar 12 and thenut 13 is constant, thecollar 12 and thenut 13 with different heights have threads with different heights, so that the actual length of thetuning screw 14 which can extend into thesecond hole section 1122 is changed, thetuning screw 14 has different adjusting depths, and the adjusting precision of thedielectric resonator 10 is increased. For example, the smaller the height of thecollar 12, the greater the height of thenut 13, so that the longer the actual length of tuningscrew 14 that can enter thetuning hole 112, the lower the frequency of thedielectric resonator 10; conversely, the greater the height of thecollar 12, the smaller the height of thenut 13, so that the shorter the actual length of tuningscrew 14 that can enter thetuning hole 112, the greater the frequency of thedielectric resonator 10.

In this embodiment, thecollar 12 may be provided as a standard piece with different heights, for example, the height of thecollar 12 may be 1.0mm, 1.5mm, 2.0mm, 2.5mm, etc., so that thecollar 12 has a plurality of selectable support depths for supporting thenut 13; accordingly, thenut 13 may be provided as a standard piece having a height, for example, the height of thenut 13 may be 2.0mm, 2.5mm, 3.0mm, 3.5mm, etc., so that thenut 13 has a plurality of selectable adjustment depths for cooperating with thetuning screw 14. During the assembly or debugging of thedielectric resonator 10, the actual length of thetuning screw 14 extending into thesecond hole section 1122 can be changed by selecting thecollar 12 with different heights to support thenut 13 and selecting thenut 13 with the corresponding height to cooperate with thetuning screw 14 for adjustment, thereby increasing the adjustment accuracy of thedielectric resonator 10. In other embodiments, a plurality ofcollars 12 with the same or different heights may be combined and used, or a plurality ofnuts 13 with the same or different heights may be combined and used, so as to further increase the adjustment accuracy of thedielectric resonator 10.

In this embodiment, thenut 13 and thecollar 12 may be separate members, so that thecollar 12 or thenut 13 may be easily replaced after being damaged, thereby reducing the manufacturing cost of thedielectric resonator 10 to some extent. In other embodiments, as shown in fig. 6, thecollar 12 and thenut 13 may also be an integrally formed component, and a portion of the integrally formed component close to thesecond hole section 1122 is the same as or similar to the structure of thecollar 12, and a portion of the integrally formed component far from thesecond hole section 1122 is the same as or similar to the structure of thenut 13, so that the structure of thedielectric resonator 10 can be simplified, and the electromagnetic field in thedielectric resonator 10 can be prevented from leaking through the gap between thenut 13 and thecollar 12.

Alternatively, the integral member may be manufactured by partially tapping or the like the pipe, block or the like, so that one part thereof is smoothly arranged, similar to thecollar 12, and the other part thereof is threadedly arranged, similar to thenut 13, and the integral member has a simple process and a reliable structure. Further, by reasonably controlling the tapping depth, the integrally formed member can be provided with a combination of smooth parts and threaded parts with different depths, namely the integrally formed member can be provided with various selectable supporting depths and adjusting depths, and similarly, the integrally formed member with different supporting depths and adjusting depths can be set into a standard piece for convenient use.

Optionally, the total height of the integrally formed member is less than or equal to the depth of thefirst hole segment 1121, so as to prevent the integrally formed member from protruding out of thedielectric block 11 when the integrally formed member is received in thefirst hole segment 1121, thereby reducing the volume of thedielectric resonator 10 and increasing the reliability of thedielectric resonator 10.

The present application further provides a fourth embodiment of the dielectric resonator, which is described on the basis of the dielectric resonator disclosed in the third embodiment. As shown in fig. 7 to 8, thetuning screw 14 is divided into afirst rod section 141 and asecond rod section 142 along the axial direction, the cross section of thefirst rod section 141 perpendicular to the axial direction is smaller than the cross section of thesecond rod section 142 perpendicular to the axial direction, thefirst rod section 141 is inserted into thecollar 12 and thenut 13, and thesecond rod section 142 is inserted into thesecond hole section 1122.

The existing tuning screw is of an equal-diameter structure, and an electromagnetic field in the dielectric resonator is easy to leak. In the present embodiment, thesecond rod section 142 of thetuning screw 14 near the bottom wall of thetuning hole 112 is designed to be thicker than other parts, as shown in fig. 7, so that the gap between the tuningscrew 14 and the inner peripheral wall of thetuning hole 112 can be reduced, thereby preventing the electromagnetic field in thedielectric resonator 10 from leaking.

Optionally, a gap between thesecond rod segment 142 and the inner peripheral wall of thesecond hole segment 1122 is less than or equal to a preset value; for example, thesecond rod section 142 and the inner peripheral wall of thesecond hole section 1122 are in a clearance fit or transition fit relationship, so that not only can the electromagnetic field in thedielectric resonator 10 be prevented from leaking, but also the coaxiality between the tuningscrew 14 and thecollar 12, thenut 13 and thedielectric block 11 can be increased, and thus the adjustment precision of thetuning screw 14 can be increased.

Further, during adjustment of thetuning screw 14 in cooperation with thenut 13, thetuning screw 14 and thecollar 12 are adjacent to the bottom wall of thetuning hole 112; for example, the portion of thetuning screw 14 extending into thesecond bore section 1122 and the portion of thetuning screw 14 engaging with thecollar 12 have a large influence on parameters such as the loss of thedielectric resonator 10. For this reason, as shown in fig. 7, in the present embodiment, thetuning screw 14 and the portion of thecollar 12 adjacent to the bottom wall of thetuning hole 112 are designed to be smooth surfaces to optimize parameters such as loss, thereby improving the performance index of thedielectric resonator 10.

In this embodiment, the peripheral wall of thefirst rod section 141 is of smooth design from a predetermined position point, which is maintained above the lower end surface of thecollar 12 during adjustment of thetuning screw 14, to the junction of thefirst rod section 141 and thesecond rod section 142. Meanwhile, the outer circumferential surface of thesecond rod section 142 is of a smooth design.

It should be noted that the predetermined position point may be a root portion of thefirst rod section 141 near thesecond rod section 142, and the specific position may be designed in advance according to the performance index of thedielectric resonator 10, and it is ensured that the threaded portion of thefirst rod section 141 does not extend into thesecond hole section 1122 during the adjustment process of thetuning screw 14.

For example, thefirst rod segment 141 includes a threadedsection 1411 and asmooth section 1412, and thesmooth section 1412 is adjacent to thesecond rod segment 142, as shown in fig. 8, the lengths of the threadedsection 1411 and thesmooth section 1412 can be designed in advance according to the performance index of thedielectric resonator 10, and it is ensured that the threadedsection 1411 does not extend into thesecond hole section 1122 during the adjustment process of thetuning screw 14. The threadedsection 1411 is in threaded fit with thenut 13, and thesmooth section 1412 is in clearance fit or transition fit with thecollar 12, so that the influence of the threadedsection 1411 on parameters such as loss of thedielectric resonator 10 can be reduced, the coaxiality between the tuningscrew 14 and thecollar 12 and thenut 13 can be increased, and the adjustment accuracy of thetuning screw 14 is increased.

Generally, in the process of assembling thedielectric block 11, thecollar 12, thenut 13 and thetuning screw 14 to form thedielectric resonator 10, thecollar 12 is firstly sleeved on thetuning screw 14, and then thenut 13 is screwed into thetuning screw 14 through thread fit, at this time, thecollar 12 and thenut 13 are located on thefirst rod section 141, for example, thecollar 12 is located on thesmooth section 1412, and thenut 13 is located on the threadedsection 1411. The assembledcollar 12,nut 13 and tuning screw 14 are then inserted into thetuning hole 112 of thedielectric block 11, with thecollar 12 andnut 13 in thefirst hole segment 1121 and thesecond rod segment 142 in thesecond hole segment 1122. Further, by using the principle of the cavity perturbation, when the cross-sectional area of thetuning hole 112 is fixed, the length of thetuning screw 14 extending into thetuning hole 112 can be adjusted by screwing in or out thetuning screw 14 to change the electromagnetic field in thedielectric block 11, thereby adjusting the frequency of thedielectric resonator 10.

Further, after thetuning screw 14 is adjusted, thecollar 12, thenut 13, and thetuning screw 14 may be locked with thedielectric block 11 by the thread fit between thenut 13 and thetuning screw 14, so that the relative positional relationship therebetween is kept unchanged, thereby increasing the stability of thedielectric resonator 10 in performance indexes.

Optionally, after thetuning screw 14 is adjusted, the part of thetuning screw 14 protruding out of thedielectric block 11 may be removed by grinding or the like, so that thetuning screw 14 is flush with thedielectric block 11, which not only can reduce the height of thedielectric resonator 10, thereby reducing the volume thereof, but also can protect the tuning screw 14 from colliding with other objects, thereby keeping the relative positions of thetuning screw 14, thecollar 12, and thenut 13 with thedielectric block 11 unchanged, and further increasing the reliability of thedielectric resonator 10. In other embodiments, the lengths of the tuning screws 14 may be calculated in advance by means of simulation, so that an assembler or a debugger may select the corresponding tuning screws 14 according to the calculation result, and after the tuning screws 14 are adjusted, the tuning screws 14 are slightly higher than, flush with, or slightly lower than thedielectric block 11, which not only reduces the volume of thedielectric resonator 10 and increases the reliability of thedielectric resonator 10, but also avoids the influence of processing operations such as grinding on the adjustment accuracy, and further increases the reliability of thedielectric resonator 10.

Referring to fig. 9, fig. 9 is a schematic diagram of a first embodiment of a dielectric filter provided in the present application.

Thedielectric filter 20 of the embodiment of the application is applied to a 5G communication system, thedielectric filter 20 includes at least twodielectric resonators 21, acoupling structure 22 is disposed between two adjacentdielectric resonators 21, and thecoupling structure 22 is used for connecting two adjacentdielectric resonators 21.

Thedielectric resonator 21 may be any one of the dielectric resonators disclosed in the above embodiments, and will not be described herein again.

In this embodiment, the dielectric blocks of at least twodielectric resonators 21 are integrally formed members to prevent leakage of the electromagnetic field in thedielectric filter 20.

Optionally, at least twodielectric resonators 21 may be connected to thecoupling structure 22 in a series manner, may also be connected to thecoupling structure 22 in a parallel manner, and may also be connected to thecoupling structure 22 in a series and parallel manner at the same time, so as to achieve different performance indexes, such as frequency and bandwidth, to meet different usage requirements, thereby increasing the application range of thedielectric filter 20.

Further, thecoupling structure 22 may be similar to the structure of thedielectric resonator 10 disclosed in any of the above embodiments, and is not described herein again. For example, thecoupling structure 22 also includes a coupling hole, a collar, a nut and a coupling screw, the coupling hole has the same structure as thetuning hole 112, and the collar and the nut are disposed in the coupling hole to reduce the volume of thedielectric filter 20 and avoid the nut and the collar from colliding with other objects, thereby increasing the reliability of thedielectric filter 20; a coupling screw is inserted into the collar and the nut and cooperates with the nut to adjust a coupling parameter of thecoupling structure 22, which may be, for example, a bandwidth.

Referring to fig. 10, fig. 10 is a schematic diagram of a first embodiment of a communication device provided in the present application.

Thecommunication device 30 of this embodiment is applied to a 5G communication system, and the communication device includes anantenna 31 and adielectric filter 32, where theantenna 31 is coupled to thedielectric filter 32, and thedielectric filter 32 may be the dielectric filter disclosed in any of the above embodiments, and is not described herein again.

Thecommunication device 30 may be a base station or a terminal for a 5G communication system, and the terminal may specifically be a mobile phone, a tablet computer, a wearable device, and the like with a 5G communication function.

It should be noted that the above embodiments belong to the same inventive concept, and the description of each embodiment has a different emphasis, and reference may be made to the description in other embodiments where the description in individual embodiments is not detailed.

Be different from prior art's condition, this application is through setting up lantern ring and nut in first hole section to avoid nut and lantern ring protrusion in the dielectric block, so not only can reduce dielectric resonator thickness in the axis direction, thereby reduce dielectric resonator's volume, can also avoid lantern ring, nut and tuning screw rod and other objects to bump, thereby increase dielectric resonator's reliability.

Further, the inner peripheral wall of the lantern ring is designed to be a smooth surface in the application, the total number of threads can be reduced, the abrasion loss of the tuning screw rod is effectively reduced, excessive grinding is avoided falling into the tuning hole, and the reliability of the dielectric resonator is further improved.

Furthermore, the height of the lantern ring in the axial direction is adjustable, so that the actual length of the tuning screw rod, which can extend into the tuning hole, can be changed, the adjusting range of the tuning screw rod is increased, and the adjusting precision of the dielectric resonator is further increased.

Furthermore, the tuning screw rod is divided into a first rod section and a second rod section along the axial direction of the tuning hole in the application, the cross section of the first rod section perpendicular to the axial direction is smaller than that of the second rod section perpendicular to the axial direction, so that the gap between the tuning screw rod and the dielectric block is reduced, the leakage of an electromagnetic field in the dielectric resonator can be avoided, the coaxiality between the tuning screw rod and the dielectric block can be increased, and the adjusting precision of the tuning screw rod is improved.

The protection circuit and the control system provided by the embodiment of the present application are described in detail above, and a specific example is applied in the description to explain the principle and the embodiment of the present application, and the description of the above embodiment is only used to help understand the method and the core idea of the present application; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.

Claims (10)

1. A dielectric resonator, characterized in that the dielectric resonator comprises:

the tuning structure comprises a dielectric block, a tuning hole and a tuning circuit, wherein the tuning hole is formed in one surface of the dielectric block;

the nut is fixedly arranged relative to the medium block;

a tuning screw inserted in the nut and further extending into the tuning hole,

the tuning screw is divided into a first rod section and a second rod section along the axial direction of the tuning hole, the cross section of the first rod section perpendicular to the axial direction is smaller than the cross section of the second rod section perpendicular to the axial direction, the first rod section is inserted into the nut, and the second rod section is inserted into the tuning hole.

2. The dielectric resonator of claim 1, wherein the tuning hole is divided from the surface into a first hole section and a second hole section along an axial direction of the tuning hole, wherein a cross section of the first hole section perpendicular to the axial direction is larger than a cross section of the second hole section perpendicular to the axial direction, so as to form an annular bearing platform at a junction of the first hole section and the second hole section, the nut is disposed in the first hole section and supported by the annular bearing platform, and the second rod section is inserted into the second hole section.

3. The dielectric resonator according to claim 2, wherein the outer end face of the nut is disposed flush with or below the surface, and the outer peripheral surface of the second rod segment is of smooth design; or, the dielectric resonator further comprises a collar, the collar is supported on the annular bearing platform, the nut is supported on the collar, the first rod section is further inserted into the collar, the inner peripheral wall of the collar is of a smooth design, the outer peripheral wall of the first rod section is of a smooth design from a preset position point to the joint of the first rod section and the second rod section, and the preset position point is always kept above the lower end face of the collar in the adjusting process of the tuning screw rod.

4. The dielectric resonator according to claim 3, wherein the number of the collars is multiple, the collars have different heights in the axial direction, so that the collars with different heights can be selected to support the nuts according to different adjustment requirements, the nuts have multiple heights in the axial direction, and the nuts with corresponding heights can be selected according to the selected collars, so that the overall height of the selected collars and nuts is smaller than or equal to a preset height value.

5. The dielectric resonator of claim 3, wherein the collar is made of a piezoelectric ceramic or an electroactive polymer, and a height of the collar in the axial direction is adjustable in an energized state.

6. The dielectric resonator of claim 3, wherein an inner diameter of the collar is smaller than an inner diameter of the second hole section, and the lower end surface of the collar is further provided with an annular flange inserted into the second hole section.

7. The dielectric resonator of claim 3, wherein the collar and the nut are integrally formed.

8. The dielectric resonator of claim 3, wherein a cross-sectional shape of the nut perpendicular to the axial direction is a polygonal arrangement, a cross-sectional shape of the collar perpendicular to the axial direction is a circular arrangement, the first hole section is further divided from the surface along the axial direction into a first sub-hole section and a second sub-hole section, wherein the cross-sectional shape of the first sub-hole section perpendicular to the axial direction is a polygonal arrangement matching the nut, and the cross-sectional shape of the second sub-hole section perpendicular to the axial direction is a circular arrangement matching the collar.

9. A dielectric filter comprising at least two dielectric resonators as claimed in any one of claims 1 to 8, a coupling structure being provided between adjacent ones of said dielectric resonators.

10. A communication device, characterized in that the communication device comprises an antenna and a dielectric filter according to claim 9, the antenna being coupled to the dielectric filter.

Images