CN210628461U - Dielectric waveguide filter capable of realizing capacitive negative coupling - Google Patents

Abstract

The utility model provides a can realize dielectric waveguide filter of capacitive negative coupling, dielectric waveguide filter selects between two syntonizers that are in the cross coupling pole within same cavity including at least three syntonizer, sets up the blind groove of half wavelength that length is more than or equal to dielectric waveguide filter for coupling characteristic between two syntonizers produces the reversal, and then realizes the capacitive negative coupling. 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 utility model discloses dielectric waveguide filter only needs just can realize the capacitive negative coupling through conventional inductive coupling window structure, can improve dielectric waveguide filter's frequency selective characteristic and outband rejection characteristic to have the characteristics of realizing simply, debugging convenience.

Description

Dielectric waveguide filter capable of realizing capacitive negative coupling

Technical Field

The utility model relates to a communication technology field's dielectric waveguide filter technique especially relates to a dielectric waveguide filter that can realize 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.

SUMMERY OF THE UTILITY MODEL

To the above-mentioned defect, the utility model aims to provide a can realize the dielectric waveguide filter of capacitive negative coupling, it can reach required filter frequency characteristic and outband rejection characteristic to have the characteristics that realize simply, the debugging is convenient.

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

According to dielectric waveguide filter, the blind groove is regular shape or irregular shape, just the blind groove is located adjacently first syntonizer with the side of the coupling window between the second syntonizer.

According to dielectric waveguide filter, the blind groove is bow-shaped blind groove, H shape blind groove, W shape blind groove, M shape blind groove or trapezoidal blind groove.

According to dielectric waveguide filter, the whole length of blind groove is more than or equal to dielectric waveguide filter's operating frequency's half wavelength.

According to the dielectric waveguide filter, the blind slot with first syntonizer with the frequency blind hole that the second syntonizer corresponds is placed together.

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

According to dielectric waveguide filter, dielectric waveguide filter's surface covering is equipped with the metallic coating.

According to the dielectric waveguide filter of the present invention, the upper surface, the lower surface and/or each side surface of the blind groove is provided with at least one non-plated region having a regular shape or an irregular shape.

According to the dielectric waveguide filter of the present invention, the non-plated region is circular, oval, square, diamond or trapezoidal.

According to the dielectric waveguide filter of the present invention, the coupling amount of the dielectric waveguide filter is determined by the size of the non-plated region, and the larger the area of the non-plated region is, the larger the coupling amount is; 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 utility model provides a structural style of capacitive negative coupling is introduced in dielectric waveguide filter, dielectric waveguide filter is including at least three syntonizer, selects between two syntonizers that are in the cross coupling pole within same cavity, sets up the blind groove of half wavelength that length is greater than or equal to dielectric waveguide filter, the blind groove is preferred regular shape or irregular shape and locates the side of the coupling window between two syntonizers can make the coupling characteristic between two syntonizers produce the reversal, and then realizes capacitive negative coupling. 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 utility model discloses dielectric waveguide filter only needs just can realize the capacitive negative coupling through conventional inductive coupling window structure, can improve dielectric waveguide filter's frequency selective characteristic and outband rejection characteristic to have the characteristics of realizing simply, debugging convenience. The utility model discloses to promoting the development of dielectric waveguide filter in modern miniaturization integrates communication system and have important effect.

Drawings

Fig. 1 is a schematic structural diagram of a model for implementing capacitive negative coupling by introducing a bow-shaped 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 implementing 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 implementing capacitive negative coupling by introducing an M-shaped 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 implementing 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 clearly understood, the present invention is further described in 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 utility model provides a structural style of capacitive negative coupling is introduced in dielectric waveguide filter 100, dielectric waveguide filter selects between first syntonizer and the second syntonizer that is in the cross coupling pole within same cavity including at least three syntonizer, sets up the blind groove (also can be called the blind hole) of half wavelength that at least one length is more than or equal to dielectric waveguide filter, makes the coupling characteristic between first syntonizer and the second syntonizer produce the reversal to realize capacitive negative coupling. 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 for implementing capacitive negative coupling by introducing a bow-shaped 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. Furthermore, the utility model discloses select between the first syntonizer 10 and the second syntonizer 20 that are in the cross coupling pole within same cavity, set up the blind groove 30 that at least one length is more than or equal to the half wavelength of dielectric waveguide filter 100, promptly the whole length of blind groove 30 is more than or equal to the half wavelength of the operating frequency of dielectric waveguide filter 100 to can realize that the coupling characteristic between first syntonizer 10 and the second syntonizer 20 produces the reversal, and then realize the capacitive negative coupling. 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.

The utility model discloses dielectric waveguide filter 100 utilizes above-mentioned structure, only needs just can obtain capacitive negative coupling through conventional inductive coupling window structure to can improve filter frequency characteristic, outband rejection characteristic. And, the utility model discloses dielectric waveguide filter 100 has the characteristics of realizing simply, debugging is simple and convenient, solves prior art and realizes the single and complicated problem of capacitive coupling mode.

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 be a ladder 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.

Therefore, the dielectric waveguide filter 100 of the present invention can adjust and realize different capacitive coupling amounts by adjusting the size and/or the number of the non-plated regions 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 of the present invention that can realize capacitive negative coupling is not limited to only the dielectric waveguide filter of six resonators, but is also able to realize this function for the dielectric waveguide filter that is greater than or equal to three resonators. 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 implementing 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. And, the utility model discloses select between first syntonizer 10 and the second syntonizer 20 that is in the cross coupling pole within same cavity, set up the blind groove 30 of H type that at least one length is more than or equal to dielectric waveguide filter 100's half wavelength, promptly the whole length of the blind groove 30 of H type is more than or equal to dielectric waveguide filter 100's operating frequency's half wavelength to can realize that the coupling characteristic between first syntonizer 10 and the second syntonizer 20 produces the reversal, and then realize the capacitive negative coupling. 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 implementing capacitive negative coupling by introducing an M-shaped 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. And, the utility model discloses select between first syntonizer 10 and the second syntonizer 20 that is in the cross coupling pole within same cavity, set up the blind groove 30 of M type that at least one length is more than or equal to dielectric waveguide filter 100's half wavelength, promptly the whole length of the blind groove 30 of M type is more than or equal to dielectric waveguide filter 100's operating frequency's half wavelength to can realize that the coupling characteristic between first syntonizer 10 and the second syntonizer 20 produces the reversal, and then realize the capacitive negative coupling. 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 implementing 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. And, the utility model discloses select between first syntonizer 10 and the second syntonizer 20 that is in the cross coupling pole within same cavity, set up the blind groove 30 of W type that at least one length is more than or equal to dielectric waveguide filter 100's half wavelength, promptly the whole length of the blind groove 30 of W type is more than or equal to dielectric waveguide filter 100's operating frequency's half wavelength to can realize that the coupling characteristic between first syntonizer 10 and the second syntonizer 20 produces the reversal, and then realize 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 realizing capacitive negative coupling according to the present invention is described in fig. 1 to fig. 4, it is only a partial example of the implementation method of the present invention, and is not used to limit the present invention.

To sum up, the utility model provides a structural style of capacitive negative coupling is introduced in dielectric waveguide filter, dielectric waveguide filter is including at least three syntonizer, selects between two syntonizers that are in the cross coupling pole within same cavity, sets up the blind groove of half wavelength that length is more than or equal to dielectric waveguide filter, the blind groove is preferred regular shape or irregular shape and locates the side of the coupling window between two syntonizers can make the coupling characteristic between two syntonizers produce the reversal, and then realizes capacitive negative coupling. 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 utility model discloses dielectric waveguide filter only needs just can realize the capacitive negative coupling through conventional inductive coupling window structure, can improve dielectric waveguide filter's frequency selective characteristic and outband rejection characteristic to have the characteristics of realizing simply, debugging convenience. The utility model discloses to promoting the development of dielectric waveguide filter in modern miniaturization integrates communication system and have important effect.

Naturally, the present invention can be embodied in many other forms without departing from the spirit or essential attributes thereof, and it should be understood that various changes and modifications can be made by one skilled in the art without departing from the spirit or essential attributes thereof, and it is intended that all such changes and modifications be considered as within the scope of the appended claims.

Claims (10)

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 slot 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.

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