CN216928904U - Dielectric resonator and filter - Google Patents
Dielectric resonator and filter Download PDFInfo
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- CN216928904U CN216928904U CN202220502711.9U CN202220502711U CN216928904U CN 216928904 U CN216928904 U CN 216928904U CN 202220502711 U CN202220502711 U CN 202220502711U CN 216928904 U CN216928904 U CN 216928904U
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Abstract
The utility model discloses a dielectric resonator and a filter, wherein the dielectric resonator comprises a resonator body, the resonator body comprises an inner dielectric body and an outer dielectric body positioned outside the inner dielectric body, the thickness of the inner dielectric body is smaller than that of the outer dielectric body, the diameter of the cross section of the inner dielectric body is smaller than that of the cross section of the outer dielectric body, and a plurality of concave grooves extending from the outer side surface to the center direction are formed in the resonator body. The filter comprises a metal resonant cavity and a dielectric resonator, wherein the dielectric resonator is fixed inside the metal resonant cavity. Two fundamental modes of the dielectric resonator work in a degenerate dual mode; the resonator body is capable of exciting a third resonant mode; the out-of-band rejection performance of the transmission response of the filter can be improved; the distance between the bottom of the concave groove and the wall surface of the central through hole is larger than or equal to 0.5 mm and smaller than or equal to 30 mm, the width of the concave groove is larger than or equal to 0.5 mm, and the higher mode can be pushed away.
Description
Technical Field
The utility model relates to the field of communication equipment, in particular to a dielectric resonator and a filter.
Background
In mobile communication, stray and blocking interference may exist between different operators or frequency spectrums, and filters with various performances are required in order to ensure good uplink and downlink performance of mobile communication and normal operation of a base station. The filter functions to pass the wanted signal and to suppress unwanted signals.
When the electromagnetic wave propagates in the high dielectric constant substance, the wavelength can be shortened, and by utilizing the theory, a dielectric material resonator can be adopted to replace a metal resonator, and under the same index, the volume of the filter can be reduced or the performance is higher. Research on dielectric resonators has been a hot spot in the communications industry. The filter is an important part of a wireless communication product, and the dielectric resonator has a particularly important significance for miniaturization of the communication product.
Within the filter cavity, there are multiple modes of electromagnetic field operation. The most common is to use its lowest fundamental mode as the operating mode, i.e. a single mode filter. For example, in the single-cavity structure of the conventional filter, single-mode transmission of a certain mode is achieved by a dielectric resonator of a specific size and shape inside a metal shield cavity. The dielectric resonator in the form is single-mode transmission and can only form a resonant cavity, namely a first-order resonant unit; and the high-order mode of the unit can not be pushed away, thereby influencing the application range of the product.
SUMMERY OF THE UTILITY MODEL
The present invention is directed to solve at least one of the technical problems in the prior art, and provides a dielectric resonator and a filter, which can generate two or three resonant modes without increasing the number of cavities and the volume, thereby improving the out-of-band rejection performance of the transmission response of the filter, and further enabling higher-order modes to be further removed.
In a first aspect, an embodiment of the present invention provides a dielectric resonator, including:
the resonator comprises a resonator body and a plurality of grooves, wherein the resonator body comprises an inner dielectric body and an outer dielectric body positioned outside the inner dielectric body, the thickness of the inner dielectric body is smaller than that of the outer dielectric body, the diameter of the cross section of the inner dielectric body is smaller than that of the cross section of the outer dielectric body, and the resonator body is provided with a plurality of concave grooves extending from the outer side surface towards the center direction; a central through hole is formed in the center of the resonator body; the distance between the bottom of the concave groove and the wall surface of the central through hole is greater than or equal to 0.5 mm and less than or equal to 30 mm, and the width of the concave groove is greater than or equal to 0.5 mm.
In a second aspect, an embodiment of the present invention provides a filter, including a metal resonant cavity and a dielectric resonator as described in the embodiment of the first aspect, where the dielectric resonator is fixed inside the metal resonant cavity.
The embodiment of the utility model comprises the following steps: a dielectric resonator and a filter. According to the scheme provided by the embodiment of the utility model, the resonator body is divided into a plurality of parts by the plurality of concave grooves on the resonator body, so that two basic modes of the dielectric resonator work in a degenerate dual mode; the resonator body formed by the inner dielectric body, the outer dielectric body and the concave groove can excite a third resonance mode, and the third resonance mode can be adjusted to enter the working frequency by adjusting the thickness of the inner dielectric body, so that the dielectric resonator works in three modes; under the condition that the number of cavities is not increased and the volume is not increased, two or three resonance modes are generated, so that the out-of-band rejection performance of the transmission response of the filter is improved; the distance between the bottom of the concave groove and the wall surface of the central through hole is greater than or equal to 0.5 mm and less than or equal to 30 mm, and the width of the concave groove is greater than or equal to 0.5 mm, so that the higher-order mode can be pushed away.
Additional features and advantages of the utility model will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the utility model. The objectives and other advantages of the utility model will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the example serve to explain the principles of the utility model and not to limit the utility model.
The utility model is further described below with reference to the accompanying drawings and examples;
fig. 1 is a schematic structural diagram of a dielectric resonator according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a dielectric resonator according to a second embodiment of the present invention;
fig. 3 is a top view of a dielectric resonator provided by an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a filter according to an embodiment of the present invention;
fig. 5 is a schematic layout of a tuning screw of a dielectric resonator according to an embodiment of the present invention;
fig. 6 is a horizontal electric field distribution diagram of a dielectric resonator according to an embodiment of the present invention;
fig. 7 is a vertical electric field distribution diagram of a dielectric resonator according to an embodiment of the present invention;
fig. 8 is a normal-direction electric field distribution diagram of a dielectric resonator according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to the present preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout.
In the description of the present invention, if there are first and second described only for the purpose of distinguishing technical features, it is not understood that relative importance is indicated or implied or that the number of indicated technical features or the precedence of the indicated technical features is implicitly indicated or implied.
In the description of the present invention, the meaning of a plurality of means is one or more, the meaning of a plurality of means is two or more, and larger, smaller, larger, etc. are understood as excluding the number, and larger, smaller, inner, etc. are understood as including the number.
In the description of the present invention, unless otherwise specifically limited, terms such as set, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention by combining the specific contents of the technical solutions.
In mobile communication, stray and blocking interference may exist between different operators or frequency spectrums, and filters with various performances are required in order to ensure good uplink and downlink performance of mobile communication and normal operation of a base station. The filter functions to pass the wanted signal and to suppress unwanted signals.
When the electromagnetic wave propagates in the high dielectric constant substance, the wavelength can be shortened, and by utilizing the theory, a dielectric material resonator can be adopted to replace a metal resonator, and under the same index, the volume of the filter can be reduced or the performance is higher. Research on dielectric resonators has been a hotspot in the communications industry. The filter is an important part of a wireless communication product, and the dielectric resonator has a particularly important significance for miniaturization of the communication product.
Within the filter cavity, there are multiple modes of electromagnetic field operation. The most common is to use its lowest fundamental mode as the operating mode, i.e. a single mode filter. For example, in the single-cavity structure of the conventional filter, single-mode transmission of a certain mode is achieved by a dielectric resonator of a specific size and shape inside a metal shielding cavity. The dielectric resonator in the form is single-mode transmission and can only form a resonant cavity, namely a first-order resonant unit; and the high-order mode of the unit can not be pushed away, thereby influencing the application range of the product.
The embodiment of the utility model provides a dielectric resonator and a filter, which can generate two or three resonance modes under the conditions of not increasing the number of cavities and not increasing the volume, improve the out-of-band rejection performance of the transmission response of the filter, and can also enable higher-order modes to be pushed away.
The embodiments of the present invention will be further explained with reference to the drawings.
Referring to fig. 1 and 3, an embodiment of the first aspect of the present invention provides a dielectric resonator, including:
the resonator comprises a resonator body 100, wherein the resonator body 100 comprises an inner dielectric body 110 and an outer dielectric body 120 positioned outside the inner dielectric body 110, the thickness of the inner dielectric body 110 is smaller than that of the outer dielectric body 120, the diameter of the cross section of the inner dielectric body 110 is smaller than that of the cross section of the outer dielectric body 120, and a plurality of concave grooves 130 extending from the outer side surface towards the center direction are formed in the resonator body 100; the center of the resonator body 100 is provided with a center through hole 140; the distance between the bottom of the concave groove 130 and the wall surface of the central through hole 140 is greater than or equal to 0.5 mm and less than or equal to 30 mm, and the width of the concave groove 130 is greater than or equal to 0.5 mm.
The plurality of concave grooves 130 on the resonator body 100 divide the resonator body 100 into a plurality of parts so that two fundamental modes of the dielectric resonator operate in a degenerate dual mode; the concave groove 130 is set to have a proper width and depth, so that the higher-order mode can be pushed away; the resonator body 100 formed by the inner dielectric body 110, the outer dielectric body 120 and the concave groove 130 can excite a third resonance mode, and the thickness of the inner dielectric body 110 can be adjusted to adjust the third resonance mode to enter the working frequency, so that the dielectric resonator works in three modes; under the condition that the number of cavities is not increased and the volume is not increased, two or three resonance modes are generated, so that the out-of-band rejection performance of the transmission response of the filter is improved.
It is understood that, referring to fig. 1 and 2, a central through hole 140 is provided at the center of the resonator body 100, which may facilitate the installation of the dielectric resonator.
It should be noted that, referring to fig. 3, a distance between the bottom of the concave groove 130 and the wall surface of the central through hole 140 is a, a width of the concave groove 130 is B, a is greater than or equal to 0.5 mm and less than or equal to 30 mm, B is greater than or equal to 0.5 mm, and when a and B satisfy the value in this range, the higher order mode of the filter can be further removed.
It should be noted that the thickness of the inner dielectric body 110 of the resonator body 100 determines the operating frequency of the third resonant mode. Referring to fig. 4, the thickness of the inner dielectric body 110 is denoted as H, and the third resonant mode can be adjusted to enter the operating frequency by adjusting the thickness H of the inner dielectric body 110, so that the dielectric resonator operates in the three modes.
The form design of the single-cavity dual-mode and three-mode dielectric resonator provided by the embodiment can enable the filter to finish the realization of two or three transmission modes under the condition of only using the physical form and the volume size of one cavity, so that the performance of the filter reaches the third order, and meanwhile, the filter has higher quality factor Q, higher debugging performance and higher producibility.
In the dielectric resonator of some embodiments, the plurality of concave grooves 130 are uniformly disposed around the resonator body 100.
For example, referring to fig. 1, three concave grooves 130 are formed around the resonator body 100; referring to fig. 2, six concave grooves 130 are formed around the resonator body 100. It will be appreciated that the resonator body 100 may also be provided with other numbers of recessed slots 130, which the skilled person may design according to the actual requirements.
As shown in the resonator body 100 of fig. 1, the three depressed grooves 130 divide the resonator body 100 into three parts, and the cross section of the resonator body 100 forms a three-petal shape, so that two fundamental modes of the dielectric resonator operate in a degenerate dual mode.
It is understood that the plurality of concave grooves 130 may be substantially uniformly disposed around the resonator body 100. For example, in the dielectric resonator shown in fig. 1, three concave grooves 130 are provided, and the central included angle of the central axes of two adjacent concave grooves 130 is set within a range of 120 ° ± 10 °, which may make the performance of the dielectric resonator better.
In the dielectric resonator of some embodiments, the recess groove 130 is a through groove penetrating the resonator body 100 in a thickness direction of the resonator body 100, such as shown in the dielectric resonator provided in fig. 1 and 2.
It is understood that the recess groove 130 may also be a blind groove that does not penetrate the resonator body 100 in the thickness direction of the resonator body 100.
Referring to fig. 1 and 2, in the dielectric resonator of some embodiments, the resonator body 100 is a cylinder. It is understood that in other embodiments, the resonator body 100 may also be a prism; when the resonator body 100 is a prism, the cross section of the resonator body 100 is an irregular polygon or a regular polygon.
Referring to fig. 1 and 2, in the dielectric resonator of some embodiments, the inner dielectric body 110 is a cylinder. It is understood that in other embodiments, the inner dielectric body 110 may be a prism; when the inner dielectric body 110 is a prism, the cross section of the inner dielectric body 110 is an irregular polygon or a regular polygon.
In addition, the surface of the dielectric resonator can be free of metallization, and the material of the dielectric resonator is a material with a certain relative dielectric constant, such as ceramic.
Referring to fig. 4, a second aspect embodiment of the present invention provides a filter, which includes a metal resonant cavity 200 and a dielectric resonator as in the first aspect embodiment, the dielectric resonator being fixed inside the metal resonant cavity 200.
The shape of the metal resonant cavity 200 may be a polyhedron or an irregularly shaped cube, such as a rectangular parallelepiped in the present embodiment.
Referring to fig. 4, in the filter of some embodiments, a support 300 for supporting the dielectric resonator is further provided inside the metal resonant cavity 200. In other embodiments, instead of the support 300, ribs for fixing the dielectric resonator may be provided. In addition, it is understood that the dielectric resonator may be directly located on the inner wall of the metal resonator 200.
Referring to fig. 4, in the filter of some embodiments, the metal resonator 200 is provided with a top opening, and the filter further includes a cover plate 210 disposed at the top opening of the metal resonator 200, and a tuning screw 220 is disposed on the cover plate 210.
The top of the metal resonant cavity 200 is open, and a cover plate 210 is arranged for sealing, so that the assembly is convenient; tuning screws 220 are provided on the cover plate 210 to adjust the resonance frequency of the filter. It should be noted that the tuning screw 220 is generally disposed in a region where the electric field is strong. For example, referring to fig. 5, in some embodiments of the filter, the tuning screw 220 is positioned above the recessed slot 130.
Fig. 6, 7 and 8 show the electric field distribution of the three modes of the filter when the dielectric resonator adopts the structural design of fig. 5: the electric field direction in fig. 6 is horizontal, the electric field direction in fig. 7 is vertical, and the electric field direction in fig. 8 is normal, for example, perpendicular to the paper surface toward the reader. The directions of the electric fields of the three modes are mutually vertical, the basic mode working modes of degenerate modes can be mutually adopted, and the three modes can be independently debugged.
In the filter of some embodiments, a plurality of metal resonators 200 are provided, the plurality of metal resonators 200 are cascaded with each other, and a dielectric resonator is provided inside each metal resonator 200.
According to the filter provided by the embodiment of the utility model, on the premise that the number of the resonant cavities is not increased and the volume is not increased, two or three resonant modes are generated, namely 1-2 stages of resonant cavities are additionally added, so that the out-of-band rejection performance of the transmission response of the filter is improved; or the volume is greatly reduced on the premise of the same cavity number; the multiple resonance modes of the filter are independently adjustable, and the producibility is very high; the quality factor Q value of the filter is not reduced due to the generation of a plurality of resonance modes; the dielectric resonator is easy to assemble and machine.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.
Claims (11)
1. A dielectric resonator, comprising:
the resonator comprises a resonator body and a plurality of grooves, wherein the resonator body comprises an inner dielectric body and an outer dielectric body positioned outside the inner dielectric body, the thickness of the inner dielectric body is smaller than that of the outer dielectric body, the diameter of the cross section of the inner dielectric body is smaller than that of the cross section of the outer dielectric body, and the resonator body is provided with a plurality of concave grooves extending from the outer side surface towards the center direction; a central through hole is formed in the center of the resonator body; the distance between the bottom of the concave groove and the wall surface of the central through hole is greater than or equal to 0.5 mm and less than or equal to 30 mm, and the width of the concave groove is greater than or equal to 0.5 mm.
2. The dielectric resonator of claim 1, wherein the plurality of recessed slots are uniformly disposed around the resonator body.
3. The dielectric resonator according to claim 1, wherein the number of the concave grooves is three, and the included angle between the centers of the central axes of two adjacent concave grooves is set within a range of 120 ° ± 10 °.
4. The dielectric resonator according to claim 1, wherein the recess groove is a through groove that penetrates the resonator body in a thickness direction of the resonator body, or a blind groove that does not penetrate the resonator body in the thickness direction of the resonator body.
5. The dielectric resonator of claim 1, wherein the resonator body is a cylinder or a prism; when the resonator body is a prism, the cross section of the resonator body is an irregular polygon or a regular polygon.
6. The dielectric resonator of claim 1, wherein the inner dielectric body is a cylinder or a prism; when the inner dielectric body is a prism, the cross section of the inner dielectric body is an irregular polygon or a regular polygon.
7. A filter comprising a metal resonator and a dielectric resonator according to any one of claims 1 to 6, said dielectric resonator being fixed inside said metal resonator.
8. The filter according to claim 7, wherein the metal resonator is provided with a rib for fixing the dielectric resonator or a support member for supporting the dielectric resonator inside.
9. The filter of claim 7, wherein the metal resonator is provided with a top opening, and further comprising a cover plate provided at the top opening of the metal resonator, the cover plate being provided with a tuning screw.
10. The filter of claim 9, wherein the tuning screw is located above the recessed slot.
11. The filter according to claim 7, wherein a plurality of said metal resonators are provided, a plurality of said metal resonators are cascaded with each other, and said dielectric resonator is provided inside each of said metal resonators.
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| CN202220502711.9U CN216928904U (en) | 2022-03-07 | 2022-03-07 | Dielectric resonator and filter |
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| CN202220502711.9U CN216928904U (en) | 2022-03-07 | 2022-03-07 | Dielectric resonator and filter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024046276A1 (en) * | 2022-08-29 | 2024-03-07 | 大富科技(安徽)股份有限公司 | Three-mode dielectric resonator and dielectric filter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024046276A1 (en) * | 2022-08-29 | 2024-03-07 | 大富科技(安徽)股份有限公司 | Three-mode dielectric resonator and dielectric filter |
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