CN213212343U - Dielectric waveguide filter with negative coupling structure - Google Patents
Dielectric waveguide filter with negative coupling structure Download PDFInfo
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- CN213212343U CN213212343U CN202021879419.6U CN202021879419U CN213212343U CN 213212343 U CN213212343 U CN 213212343U CN 202021879419 U CN202021879419 U CN 202021879419U CN 213212343 U CN213212343 U CN 213212343U
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Abstract
The embodiment of the utility model discloses a dielectric waveguide filter with a negative coupling structure, which comprises a filter body, wherein the filter body comprises two resonators and a negative coupling structure, and the two resonators are connected with each other; the negative coupling structure comprises a negative coupling blind hole and a negative coupling blind groove, and the negative coupling blind hole is arranged on the upper surface of the filter body corresponding to the connection part between the two resonators; the negative coupling blind slot is arranged on the lower surface of the filter body corresponding to the joint between the two resonators, and the notch of the negative coupling blind slot is connected with any one of the left surface and the right surface of the filter body. The technical problems that the dielectric waveguide filter with the negative coupling structure is high in manufacturing difficulty and poor in structural stability are solved.
Description
Technical Field
The utility model relates to a wave filter technical field especially relates to a dielectric waveguide wave filter with negative coupling structure.
Background
With the development of the communication field, the miniaturization, the light weight and the high performance of the filter gradually become a trend, wherein the dielectric waveguide filter has the characteristics of small volume, high Q value and light weight, and meets the development requirements of the current filter, and therefore, the design of the dielectric waveguide filter becomes the research hot in the current communication field.
In addition, with the rapid development of microwave communication, the dielectric waveguide filter is required to have better out-of-band attenuation, and therefore, a negative coupling structure conforming to mass production becomes a key point for researching the dielectric waveguide filter.
However, because the volume of the dielectric waveguide filter is small, the design of the negative coupling structure needs to fully consider the space of the product and the sensitivity degree of the negative coupling, and the situation that the product is difficult to press due to occupation of a large amount of space and is difficult to produce in batches or the requirement on production precision control is high due to too high sensitivity needs to be avoided in the design process.
In the prior art, the following two technologies are mainly used for realizing the negative coupling structure of two resonant cavities:
firstly, in the design, a coupling blind hole is additionally arranged between the upper surface and the lower surface of the two resonators according to the required negative coupling quantity between the two resonators, and the required negative coupling quantity reaching the two resonators is achieved by changing the depth of the blind hole. However, the required negative coupling amount is realized only by adding a blind hole, the depth of the coupling blind hole is deep due to the single realization mode, the adjustment of the coupling amount is sensitive due to the excessively deep blind hole, the pressing precision is difficult to guarantee, and the requirement of actual mass production is difficult to meet if the situation occurs, so that the adjustment by adding the blind hole on the upper surface and the lower surface has certain limitation.
Secondly, in the design, according to the required negative coupling quantity between the two resonators, the distance between the upper and lower coupling blind holes staggered in position is adjusted or the depth of the two blind holes is changed, so that the two resonators achieve the required negative coupling quantity. Although the situation that the wall thickness of the upper surface and the lower surface of the resonator is possibly too thin can be solved by the negative coupling implementation method, the situation that two blind holes exist in the same space at the same time can be met only by reserving a larger position in the same space, the miniaturization of the structure cannot be met, and meanwhile, if the two blind holes cannot exist in the same space at the same time due to insufficient space between two resonators, the wall thickness between the two blind holes is reduced due to the two blind holes with the close distances, the production difficulty is increased, and the structure is unstable, so that the negative coupling implementation method has certain limitation.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model discloses dielectric waveguide filter with negative coupling structure for solve the dielectric waveguide filter that has negative coupling structure among the prior art and make the technical problem that the degree of difficulty is high and structural stability is relatively poor.
The embodiment of the utility model provides a dielectric waveguide filter with a negative coupling structure, which comprises a filter body, wherein the filter body comprises two resonators and a negative coupling structure, and the two resonators are connected with each other;
the negative coupling structure comprises a negative coupling blind hole and a negative coupling blind slot, and the negative coupling blind hole is arranged on the upper surface of the filter body corresponding to the connection part between the two resonators;
the negative coupling blind slot is arranged on the lower surface of the filter body corresponding to the joint between the two resonators, and the notch of the negative coupling blind slot is connected with any one of the left surface and the right surface of the filter body.
Preferably, the filter body is a ceramic dielectric body with a metal coating attached to the surface.
Preferably, the filter body is provided with loading blind holes on the corresponding upper surfaces of the two resonators, and the loading blind holes are used for limiting the resonant frequency of the corresponding resonators.
Preferably, the negative coupling blind hole is used for limiting the negative coupling amount between the two resonators, and the negative coupling blind hole limits the negative coupling amount between the two resonators through the depth or the cross-sectional area of the negative coupling blind hole.
Preferably, the negative coupling blind slot is used for limiting the negative coupling amount between the two resonators, and the negative coupling blind slot limits the negative coupling amount between the two resonators through the depth or width of the negative coupling blind slot.
Preferably, the outer surfaces of the negative coupling blind hole and the negative coupling blind groove are plated with metal coatings.
Preferably, the cross section of the negative coupling blind hole is any one of circular, rectangular, oval and special-shaped.
Preferably, the cross section of the negative coupling blind slot is any one of circular, rectangular, oval and irregular.
According to the technical solution provided by the utility model, the embodiment of the utility model has the following advantage:
the embodiment of the utility model provides a dielectric waveguide filter with negative coupling structure constitutes dielectric waveguide filter's negative coupling structure through negative coupling blind hole and negative coupling blind groove, can realize the negative coupling between two syntonizers, and sets up the negative coupling blind hole through only the upper surface that the junction between the wave filter body for two syntonizers corresponds, both easily dielectric waveguide filter's processing, the stability of easily structure again. In addition, the lower surface of the filter body corresponding to the upper surface is provided with the negative coupling blind groove, the notch of the negative coupling blind groove is connected with any one surface of the left surface or the right surface of the filter body, the space of the dielectric waveguide filter can be fully utilized, meanwhile, the negative coupling amount between the two resonators can be limited by limiting the size of the negative coupling blind groove, the sensitivity and the hole depth of negative coupling are improved, and the mass production of the dielectric waveguide filter is facilitated.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of a dielectric waveguide filter having a negative coupling structure according to an embodiment of the present invention.
Detailed Description
The technical solutions of the embodiments of the present application will be described clearly and completely with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without any creative effort belong to the protection scope of the embodiments in the present application.
In the description of the embodiments of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the embodiments of the present application and simplifying the description, but do not indicate or imply that the referred devices or elements must have specific orientations, be configured in specific orientations, and operate, and thus, should not be construed as limiting the embodiments of the present application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the embodiments of the present application, it should be noted that the terms "mounted," "connected," and "connected" are used broadly and are defined as, for example, a fixed connection, an exchangeable connection, an integrated connection, a mechanical connection, an electrical connection, a direct connection, an indirect connection through an intermediate medium, and a communication between two elements, unless otherwise explicitly stated or limited. Specific meanings of the above terms in the embodiments of the present application can be understood in specific cases by those of ordinary skill in the art.
For convenience of understanding, referring to fig. 1, a dielectric waveguide filter with a negative coupling structure provided in an embodiment of the present invention includes a filter body, the filter body includes two resonators 301 and 302 and a negative coupling structure, the two resonators 301 and 302 are connected to each other;
the negative coupling structure comprises a negative coupling blind hole 303 and a negative coupling blind slot 304, wherein the negative coupling blind hole 303 is arranged on the upper surface of the filter body corresponding to the connection position between the two resonators 301 and 302;
the negative coupling blind slot 304 is arranged on the lower surface of the filter body corresponding to the joint between the two resonators 301 and 302, and the notch of the negative coupling blind slot 304 is connected with any one of the left surface and the right surface of the filter body.
It can be understood that the negative coupling structure of the dielectric waveguide filter is formed by the negative coupling blind hole 303 and the negative coupling blind groove 304, so that the negative coupling between the two resonators 301 and 302 can be realized, and the situation that the coupling blind holes are loaded on the upper and lower surfaces of the filter body due to the fact that the coupling blind holes are difficult to press or sensitive in coupling and the pressing precision needs to be improved due to the fact that the coupling blind holes are deep can be avoided by arranging the negative coupling blind hole 303 only on the upper surface of the filter body corresponding to the joint between the two resonators 301 and 302, and the situation that the wall thickness between the two coupling blind holes is thin can be avoided, and a single coupling blind hole is arranged through the embodiment, so that the dielectric waveguide filter is easy to process, and the structural stability is easy;
in addition, the lower surface of the filter body corresponding to the upper surface is provided with the negative coupling blind groove 304, the notch of the negative coupling blind groove is connected with any one surface of the left surface and the right surface of the filter body, the space of the dielectric waveguide filter, particularly the space of the left surface and the right surface, can be fully utilized, meanwhile, the negative coupling amount between the two resonators 301 and 302 can be limited by limiting the size of the negative coupling blind groove 304, the sensitivity and the hole depth of negative coupling are improved, and the mass production of the dielectric waveguide filter is facilitated.
Furthermore, the filter body is a ceramic dielectric body with a metal coating attached to the surface.
It should be noted that the surface metal plating layer is processed by a metallization process, which is the prior art and is not described herein again.
Further, the filter body is provided with loading blind holes 305, 306 with respect to the corresponding upper surfaces of the two resonators 301, 302, and the loading blind holes 305, 306 are used for defining the resonance frequency of the corresponding resonator.
It should be noted that the loading blind holes 305, 306 define the resonant frequency of the corresponding resonator by defining the hole depth or cross-sectional area of the loading blind holes 305, 306.
Further, the negative coupling blind hole 303 serves to define the amount of negative coupling between the two resonators 301, 302, and the negative coupling blind hole 303 defines the amount of negative coupling between the two resonators 301, 302 by the depth or cross-sectional area of the negative coupling blind hole 303.
Further, the negative coupling blind slot 304 is used to define the amount of negative coupling between the two resonators 301, 302, and the negative coupling blind slot 304 defines the amount of negative coupling between the two resonators 301, 302 by the depth or width of the negative coupling blind slot 304.
Note that the groove depth direction of the negative coupling blind groove 304 is parallel to the depth direction of the filter body, and the width direction of the negative coupling blind groove 304 is parallel to the longitudinal direction of the filter body.
Further, the outer surfaces of the negative coupling blind hole 303 and the negative coupling blind groove 304 are plated with metal plating.
It should be noted that the surface metal plating layer is processed by a metallization process, which is the prior art and is not described herein again.
Further, the cross section of the negative coupling blind hole 303 is any one of a circle, a rectangle, an ellipse and an abnormity.
Further, the cross section of the negative coupling blind slot 304 is any one of circular, rectangular, oval and irregular.
The above is to describe the embodiment provided by the present invention in detail, and to the general technical personnel in the field, according to the utility model discloses the thought of the embodiment all has the change part on concrete implementation and application scope, to sum up, this description content should not be understood as the restriction of the present invention.
Claims (8)
1. A dielectric waveguide filter with a negative coupling structure comprises a filter body, and is characterized in that the filter body comprises two resonators and the negative coupling structure, wherein the two resonators are connected with each other;
the negative coupling structure comprises a negative coupling blind hole and a negative coupling blind slot, and the negative coupling blind hole is arranged on the upper surface of the filter body corresponding to the connection part between the two resonators;
the negative coupling blind slot is arranged on the lower surface of the filter body corresponding to the joint between the two resonators, and the notch of the negative coupling blind slot is connected with any one of the left surface and the right surface of the filter body.
2. A dielectric waveguide filter having a negative coupling structure according to claim 1, wherein the filter body is a ceramic dielectric body with a metal coating on the surface.
3. A dielectric waveguide filter with a negative coupling structure as claimed in claim 1, wherein the filter body is provided with loading blind holes on the corresponding upper surfaces of the two resonators, and the loading blind holes are used for defining the resonant frequency of the corresponding resonators.
4. The dielectric waveguide filter with a negative coupling structure according to claim 1, wherein the negative coupling blind hole is used to define an amount of negative coupling between the two resonators, and the negative coupling blind hole defines the amount of negative coupling between the two resonators by a depth or a cross-sectional area of the negative coupling blind hole.
5. The dielectric waveguide filter having a negative coupling structure according to claim 1 or 4, wherein the negative coupling blind slot is used to define an amount of negative coupling between the two resonators, and the negative coupling blind slot defines the amount of negative coupling between the two resonators by a depth or a width of the negative coupling blind slot.
6. The dielectric waveguide filter with a negative coupling structure as claimed in claim 5, wherein the outer surfaces of the negative coupling blind hole and the negative coupling blind slot are plated with metal plating.
7. The dielectric waveguide filter with a negative coupling structure according to claim 1, wherein the cross section of the negative coupling blind hole is any one of a circle, a rectangle and an ellipse.
8. The dielectric waveguide filter with the negative coupling structure according to claim 1, wherein the cross section of the negative coupling blind slot is any one of a circle, a rectangle and an ellipse.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021879419.6U CN213212343U (en) | 2020-09-01 | 2020-09-01 | Dielectric waveguide filter with negative coupling structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021879419.6U CN213212343U (en) | 2020-09-01 | 2020-09-01 | Dielectric waveguide filter with negative coupling structure |
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| Publication Number | Publication Date |
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| CN213212343U true CN213212343U (en) | 2021-05-14 |
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| CN202021879419.6U Active CN213212343U (en) | 2020-09-01 | 2020-09-01 | Dielectric waveguide filter with negative coupling structure |
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