阅读说明：本技术 一种可实现容性负耦合的介质波导滤波器 (Dielectric waveguide filter capable of realizing capacitive negative coupling ) 是由 洪星 叶荣 王斌华 廖东 于 2019-10-22 设计创作，主要内容包括：本发明提供了一种可实现容性负耦合的介质波导滤波器,所述介质波导滤波器包括有至少三个谐振器,选择在同一个腔体之内处于交叉耦合极点的两个谐振器之间,设置长度大于或等于介质波导滤波器的半波长的盲槽,使得两个谐振器之间的耦合特性产生反转,进而实现容性负耦合。优选的是,所述盲槽的上表面、下表面和/或各侧面设有如弓型、W型、H型、M型等形状的未电镀区域,由此实现所述两个谐振器之间的容性负耦合。借此,本发明介质波导滤波器只需通过常规的感性耦合窗口结构就能实现容性容性负耦合,可提高介质波导滤波器的频率选择特性和带外抑制特性,并且具有实现简单、调试方便的特点。(The invention provides a dielectric waveguide filter capable of realizing capacitive negative coupling, which comprises at least three resonators, wherein a blind slot with the length being more than or equal to half wavelength of the dielectric waveguide filter is arranged between two resonators which are positioned at cross coupling poles in the same cavity, so that the coupling characteristics between the two resonators are reversed, and the capacitive negative coupling is further realized. Preferably, the upper surface, the lower surface and/or each side surface of the blind groove are provided with an unplated region in a shape of a bow, a W, an H, an M, etc., thereby realizing capacitive negative coupling between the two resonators. Therefore, the dielectric waveguide filter can realize the capacitive negative coupling only through the conventional inductive coupling window structure, can improve the frequency selection characteristic and the out-of-band rejection characteristic of the dielectric waveguide filter, and has the characteristics of simple realization and convenient debugging.)

1. A dielectric waveguide filter capable of realizing capacitive negative coupling is characterized in that the dielectric waveguide filter comprises at least three resonators, at least one blind slot with the length being larger than or equal to half the wavelength of the dielectric waveguide filter is arranged between a first resonator and a second resonator which are positioned at cross coupling poles in the same cavity, and the coupling characteristics between the first resonator and the second resonator are reversed to generate the capacitive negative coupling.

2. A dielectric waveguide filter according to claim 1, wherein the blind slot is of a regular shape or an irregular shape, and is provided at a side of the coupling window between the first resonator and the second resonator.

3. A dielectric waveguide filter according to claim 1, wherein the blind slot is an arcuate blind slot, an H-shaped blind slot, a W-shaped blind slot, an M-shaped blind slot or a trapezoidal blind slot.

4. A dielectric waveguide filter according to claim 1 wherein the overall length of the blind slot is greater than or equal to one half the wavelength of the operating frequency of the dielectric waveguide filter.

5. A dielectric waveguide filter according to claim 1, wherein the blind slot is placed together with corresponding frequency blind holes of the first and second resonators.

6. A dielectric waveguide filter according to claim 1, wherein the amount of coupling of the dielectric waveguide filter is determined by the size of the blind slot; the larger the area of the blind groove is, the larger the coupling amount is.

7. A dielectric waveguide filter according to claim 1 wherein the surface of the dielectric waveguide filter is coated with a metal coating.

8. A dielectric waveguide filter according to any one of claims 1 to 6 wherein the upper, lower and/or each side of the blind slot is provided with at least one non-plated region of regular or irregular shape.

9. A dielectric waveguide filter according to claim 8, wherein the unplated areas are circular, oval, square, diamond or trapezoidal.

10. The dielectric waveguide filter of claim 8, wherein the amount of coupling of the dielectric waveguide filter is determined by the size of the unplated region, the greater the area of the unplated region, the greater the amount of coupling; and/or

The coupling amount of the dielectric waveguide filter is determined by the number of the non-plating areas, and the coupling amount is larger when the number of the non-plating areas is larger.

Technical Field

The invention relates to a dielectric waveguide filter technology in the technical field of communication, in particular to a dielectric waveguide filter capable of realizing capacitive negative coupling.

Background

With the continuous development of modern communication technology, the performance index requirements of the filter are higher and higher. The dielectric waveguide filter has small size, high Q value, low cost and other features, and may be used in communication system with high miniaturization and integration level. However, with the continuous development of multi-frequency systems, the requirements for the frequency selection characteristic and the out-of-band rejection characteristic of the filter are also higher and higher. The introduction of capacitive coupling is an important method for improving the frequency selection characteristic and the out-of-band rejection characteristic of the filter, and the most common method for realizing the capacitive coupling is to introduce a metal coupling probe. However, for the dielectric waveguide filter, the manner of introducing the coupling probe is difficult, and a mature technical scheme for introducing the coupling probe into the dielectric waveguide filter does not exist at present.

In view of the above, the prior art is obviously inconvenient and disadvantageous in practical use, and needs to be improved.

Disclosure of Invention

In view of the above-mentioned drawbacks, an object of the present invention is to provide a dielectric waveguide filter capable of realizing capacitive negative coupling, which can achieve the required frequency characteristics and out-of-band rejection characteristics of the filter, and has the characteristics of simple implementation and convenient debugging.

In order to achieve the above object, the present invention provides a dielectric waveguide filter capable of achieving capacitive negative coupling, the dielectric waveguide filter includes at least three resonators, a first resonator and a second resonator are selected to be located between cross-coupling poles in the same cavity, at least one blind slot with a length greater than or equal to half the wavelength of the dielectric waveguide filter is arranged, and the coupling characteristics between the first resonator and the second resonator are reversed to achieve capacitive negative coupling.

According to the dielectric waveguide filter, the blind slot is in a regular shape or an irregular shape, and the blind slot is arranged on the side surface of the coupling window between the adjacent first resonator and the second resonator.

According to the dielectric waveguide filter, the blind grooves are arc-shaped blind grooves, H-shaped blind grooves, W-shaped blind grooves, M-shaped blind grooves or trapezoidal blind grooves.

According to the dielectric waveguide filter, the overall length of the blind slot is greater than or equal to a half wavelength of the working frequency of the dielectric waveguide filter.

According to the dielectric waveguide filter, the blind slot and the frequency blind holes corresponding to the first resonator and the second resonator are placed together.

According to the dielectric waveguide filter, the coupling amount of the dielectric waveguide filter is determined by the size of the blind slot; the larger the area of the blind groove is, the larger the coupling amount is.

According to the dielectric waveguide filter, the surface of the dielectric waveguide filter is covered with the metal coating.

According to the dielectric waveguide filter, the upper surface, the lower surface and/or each side surface of the blind groove are/is provided with at least one non-electroplating area in a regular shape or an irregular shape.

According to the dielectric waveguide filter, the non-electroplated area is circular, oval, square, rhombic or trapezoidal.

According to the dielectric waveguide filter, the coupling quantity of the dielectric waveguide filter is determined by the size of the non-plated area, and the coupling quantity is larger when the area of the non-plated area is larger; and/or

The coupling amount of the dielectric waveguide filter is determined by the number of the non-plating areas, and the coupling amount is larger when the number of the non-plating areas is larger.

The invention provides a structural form for introducing capacitive negative coupling into a dielectric waveguide filter, wherein the dielectric waveguide filter comprises at least three resonators, a blind slot with the length being more than or equal to half wavelength of the dielectric waveguide filter is arranged between two resonators at cross coupling poles in the same cavity, the blind slot is preferably in a regular shape or an irregular shape and is arranged on the side surface of a coupling window between the two resonators, so that the coupling characteristics between the two resonators can be reversed, and the capacitive negative coupling is further realized. Preferably, the upper surface, the lower surface and/or each side surface of the blind groove are provided with an unplated region in a regular shape such as a bow shape, a W shape, an H shape, an M shape, or an irregular shape, thereby realizing capacitive negative coupling between the two resonators. Therefore, the dielectric waveguide filter can realize the capacitive negative coupling only through the conventional inductive coupling window structure, can improve the frequency selection characteristic and the out-of-band rejection characteristic of the dielectric waveguide filter, and has the characteristics of simple realization and convenient debugging. The invention has important function for promoting the development of the dielectric waveguide filter in the modern miniaturized integrated communication system.

Drawings

Fig. 1 is a schematic structural diagram of a model for implementing capacitive negative coupling by introducing an arcuate blind slot between two resonators of a dielectric waveguide filter according to a first embodiment of the present invention;

fig. 2 is a schematic structural diagram of a model for realizing capacitive negative coupling by introducing an H-shaped blind slot between two resonators of a dielectric waveguide filter according to a second embodiment of the present invention;

fig. 3 is a schematic structural diagram of a model for realizing capacitive negative coupling by introducing an M-type blind slot between two resonators of a dielectric waveguide filter according to a third embodiment of the present invention;

fig. 4 is a schematic structural diagram of a model for realizing capacitive negative coupling by introducing a W-shaped blind slot between two resonators of a dielectric waveguide filter according to a fourth embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

It should be noted that references in the specification to "one embodiment," "an example embodiment," etc., indicate that the embodiment described may include a particular feature, structure, or characteristic, but every embodiment may not necessarily include the particular feature, structure, or characteristic. Moreover, such phrases are not intended to refer to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with an embodiment, it is submitted that it is within the knowledge of one skilled in the art to effect such feature, structure, or characteristic in connection with other embodiments whether or not explicitly described.

Moreover, where certain terms are used throughout the description and following claims to refer to particular components or features, those skilled in the art will understand that manufacturers may refer to a component or feature by different names or terms. This specification and the claims that follow do not intend to distinguish between components or features that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. In addition, the term "connected" as used herein includes any direct and indirect electrical connection. Indirect electrical connection means include connection by other means.

The invention provides a structural form for introducing capacitive negative coupling into a dielectric waveguide filter 100, which comprises at least three resonators, wherein at least one blind slot (also called a blind hole) with the length being more than or equal to half the wavelength of the dielectric waveguide filter is arranged between a first resonator and a second resonator which are positioned at cross-coupling poles in the same cavity, so that the coupling characteristics between the first resonator and the second resonator are reversed, and the capacitive negative coupling is realized. The blind slot is in a regular shape or an irregular shape, and is arranged on the side face of the coupling window between the adjacent first resonator and the second resonator. Preferably, the upper surface, the lower surface and/or each side surface of the blind groove are provided with an unplated region in a shape of a bow, a W, an H, an M, etc., thereby realizing capacitive negative coupling between the two resonators. Preferably, the surface of the dielectric waveguide filter is covered with a metal coating. The dielectric material of the dielectric waveguide filter may be a conductive material such as ceramic.

Fig. 1 is a schematic structural diagram of a model of capacitive negative coupling achieved by introducing an arcuate blind slot between two resonators of a dielectric waveguide filter according to a first embodiment of the present invention. In one embodiment, the dielectric waveguide filter 100 includes six resonators, each of which may include a resonant cavity, a resonant pillar, a frequency blind hole, and the like. In addition, in the invention, at least one blind slot 30 with the length being greater than or equal to the half wavelength of the dielectric waveguide filter 100 is arranged between the first resonator 10 and the second resonator 20 which are positioned at the cross-coupling poles in the same cavity, namely, the whole length of the blind slot 30 is greater than or equal to the half wavelength of the working frequency of the dielectric waveguide filter 100, so that the coupling characteristic between the first resonator 10 and the second resonator 20 can be reversed, and further, the capacitive negative coupling can be realized. Preferably, the blind slot 30 is provided at a side of the coupling window 40 between the first resonator 10 and the second resonator 20.

By using the structure, the dielectric waveguide filter 100 of the invention can obtain capacitive negative coupling only through a conventional inductive coupling window structure, thereby improving the frequency characteristic and out-of-band rejection characteristic of the filter. Moreover, the dielectric waveguide filter 100 of the present invention has the characteristics of simple implementation and simple and convenient debugging, and solves the problem of single and complex capacitive coupling implementation manner in the prior art.

Preferably, the blind slot 30 has a regular shape or an irregular shape, and the blind slot 30 is disposed at a side of the coupling window 40 between the adjacent first and second resonators 10 and 20. The blind groove 30 may be any shape such as an arcuate blind groove, an H-shaped blind groove, a W-shaped blind groove, an M-shaped blind groove, or a trapezoidal blind groove. In the first embodiment, the blind groove 30 is an arcuate blind groove 30. Of course, the specific shape of the blind groove 30 of the present invention is not limited, for example, the blind groove 30 may have a stepped structure with different upper and lower sizes and different shapes.

Preferably, the upper surface, the lower surface and/or each side of the blind groove 30 is provided with an unplated region 50 having a shape such as a bow, a W, an H, an M, a trapezoid, etc., thereby achieving a capacitive negative coupling between the two first resonators 10 and the second resonator 20. Preferably, the blind slot 30 may be placed together with the frequency blind holes 30 corresponding to the first resonator 10 and the second resonator 20.

Preferably, the surface of the dielectric waveguide filter 100 is covered with a metal plating layer. The dielectric material of the dielectric waveguide filter 100 is ceramic, but other electrically conductive materials may be used.

The amount of coupling of the dielectric waveguide filter 100 may be determined by the size of the blind slot 30. The larger the area of the blind groove 30, the larger the coupling amount of the dielectric waveguide filter 100. Therefore, the dielectric waveguide filter 100 of the present invention can adjust and realize different capacitive coupling amounts by adjusting the area size of the blind slot 30. For example, when the amount of coupling required for the dielectric waveguide filter 100 is small, the area of the blind groove 30 may be set small. When the amount of coupling required for the dielectric waveguide filter 100 is large, the area of the blind groove 30 can be set large.

Preferably, the upper surface, the lower surface and/or each side of the blind groove 30 is provided with at least one non-plated region 50 having a regular shape or an irregular shape, thereby achieving capacitive negative coupling between the adjacent first resonator 10 and second resonator 20. The non-plated region 50 may have any shape such as a circle, an ellipse, a square, a diamond, or a trapezoid. In the first embodiment, the unplated area 50 is circular, that is, the bottom of the blind slot 30 is provided with a circle of unplated isolation ring 50, thereby introducing a TE102 mode, and in contrast to the TE101 mode of the front and back cavities, realizing capacitive negative coupling between the first resonator 10 and the second resonator 20.

Preferably, the coupling amount of the dielectric waveguide filter 100 is determined by the size of the non-plated region 50, and the larger the area of the non-plated region 50, the larger the coupling amount of the dielectric waveguide filter 100; and/or the coupling amount of the dielectric waveguide filter 100 can be determined by the number of the non-plated regions 50, and the greater the number of the non-plated regions 50, the greater the coupling amount of the dielectric waveguide filter 100.

Thus, the dielectric waveguide filter 100 of the present invention can adjust and achieve different amounts of capacitive coupling by adjusting the size and/or number of the unplated areas 50. For example, when the amount of coupling required for the dielectric waveguide filter 100 is small, only the upper surface or the lower surface of the blind groove 30 may be provided with the non-plated region 50. When the amount of coupling required for the dielectric waveguide filter 100 is large, the upper surface, the lower surface, and each side surface of the blind groove 30 may be provided with the non-plated region 50.

Preferably, the surface of the dielectric waveguide filter 100 is covered with a metal plating layer. As the dielectric material of the dielectric waveguide filter 100, a conductive material such as ceramic can be used.

It should be noted that the dielectric waveguide filter 100 of fig. 1 is composed of six resonators. However, the dielectric waveguide filter 100 capable of achieving capacitive negative coupling according to the present invention is not limited to a dielectric waveguide filter with six resonators, and a dielectric waveguide filter with more than or equal to three resonators can achieve this function. For example, the dielectric waveguide filter 100 may be a dielectric waveguide filter composed of three, four, five, seven, eight, nine, ten, or more resonators. Two resonators with cross-coupled poles are selected, and a blind slot with a wavelength greater than or equal to half the wavelength of the dielectric waveguide filter 100 is added between the two resonators, so that the coupling characteristics between the two resonators are reversed, and capacitive negative coupling is realized.

Fig. 2 is a schematic structural diagram of a model for realizing capacitive negative coupling by introducing an H-shaped blind slot between two resonators of a dielectric waveguide filter according to a second embodiment of the present invention. In the second embodiment, the dielectric waveguide filter 100 includes six resonators, each of which may include a resonant cavity, a resonant pillar, a frequency blind hole, and the like. In addition, in the invention, at least one H-shaped blind slot 30 with the length greater than or equal to the half wavelength of the dielectric waveguide filter 100 is arranged between the first resonator 10 and the second resonator 20 which are positioned at the cross-coupling poles in the same cavity, that is, the whole length of the H-shaped blind slot 30 is greater than or equal to the half wavelength of the working frequency of the dielectric waveguide filter 100, so that the coupling characteristic between the first resonator 10 and the second resonator 20 can be reversed, and further, the capacitive negative coupling can be realized. Preferably, the H-type blind slot 30 is provided at a side of the coupling window 40 between the first resonator 10 and the second resonator 20. In the second embodiment, the blind slot 30 of the dielectric waveguide filter 100 is an H-shaped blind slot 30, and the structure of other parts of the dielectric waveguide filter 100 is basically the same as that in the first embodiment, so that the description thereof is omitted.

Fig. 3 is a schematic structural diagram of a model for realizing capacitive negative coupling by introducing an M-type blind slot between two resonators of a dielectric waveguide filter according to a third embodiment of the present invention. The dielectric waveguide filter 100 in this embodiment includes six resonators, each of which may include a resonant cavity, a resonant pillar, a frequency blind hole, and the like. In addition, in the invention, at least one M-type blind slot 30 with the length greater than or equal to the half wavelength of the dielectric waveguide filter 100 is arranged between the first resonator 10 and the second resonator 20 which are positioned at the cross-coupling poles in the same cavity, that is, the whole length of the M-type blind slot 30 is greater than or equal to the half wavelength of the working frequency of the dielectric waveguide filter 100, so that the coupling characteristic between the first resonator 10 and the second resonator 20 can be reversed, and further, the capacitive negative coupling can be realized. Preferably, the M-type blind slot 30 is provided at a side of the coupling window 40 between the first resonator 10 and the second resonator 20. In the second embodiment, the blind slot 30 of the dielectric waveguide filter 100 is an M-shaped blind slot 30, and the structure of other parts of the dielectric waveguide filter 100 is basically the same as that in the first embodiment, so that the description thereof is omitted.

Fig. 4 is a schematic structural diagram of a model for realizing capacitive negative coupling by introducing a W-shaped blind slot between two resonators of a dielectric waveguide filter according to a fourth embodiment of the present invention. The dielectric waveguide filter 100 in this embodiment includes six resonators, each of which may include a resonant cavity, a resonant pillar, a frequency blind hole, and the like. In addition, the invention selects and sets at least one W-shaped blind slot 30 with the length being more than or equal to the half wavelength of the dielectric waveguide filter 100 between the first resonator 10 and the second resonator 20 which are positioned at the cross coupling poles in the same cavity, namely, the whole length of the W-shaped blind slot 30 is more than or equal to the half wavelength of the working frequency of the dielectric waveguide filter 100, thereby realizing the reversal of the coupling characteristic between the first resonator 10 and the second resonator 20 and further realizing the capacitive negative coupling. Preferably, the W-shaped blind slot 30 is provided at a side of the coupling window 40 between the first resonator 10 and the second resonator 20. In the second embodiment, the blind slot 30 of the dielectric waveguide filter 100 is a W-shaped blind slot 30, and the structure of other parts of the dielectric waveguide filter 100 is basically the same as that in the first embodiment, so that the description thereof is omitted.

It is to be noted that, although the structure of the dielectric waveguide filter 100 capable of achieving the capacitive negative coupling according to the present invention is described with reference to fig. 1 to 4, it is only a partial example of the implementation method of the present invention and is not intended to limit the present invention.

In summary, the present invention provides a structural form of introducing capacitive negative coupling into a dielectric waveguide filter, where the dielectric waveguide filter includes at least three resonators, and a blind slot with a length greater than or equal to half a wavelength of the dielectric waveguide filter is selected between two resonators located at cross-coupling poles in a same cavity, and the blind slot is preferably in a regular shape or an irregular shape and is disposed on a side surface of a coupling window between the two resonators, so that coupling characteristics between the two resonators can be reversed, and capacitive negative coupling is further achieved. Preferably, the upper surface, the lower surface and/or each side surface of the blind groove are provided with an unplated region in a regular shape such as a bow shape, a W shape, an H shape, an M shape, or an irregular shape, thereby realizing capacitive negative coupling between the two resonators. Therefore, the dielectric waveguide filter can realize the capacitive negative coupling only through the conventional inductive coupling window structure, can improve the frequency selection characteristic and the out-of-band rejection characteristic of the dielectric waveguide filter, and has the characteristics of simple realization and convenient debugging. The invention has important function for promoting the development of the dielectric waveguide filter in the modern miniaturized integrated communication system.

The present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof, and it should be understood that various changes and modifications can be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.