CN210074111U - Negative coupling structure and dielectric filter - Google Patents
Negative coupling structure and dielectric filter Download PDFInfo
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- CN210074111U CN210074111U CN201921096697.1U CN201921096697U CN210074111U CN 210074111 U CN210074111 U CN 210074111U CN 201921096697 U CN201921096697 U CN 201921096697U CN 210074111 U CN210074111 U CN 210074111U
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Abstract
The utility model discloses a negative coupling structure, which comprises two dielectric resonators, wherein each dielectric resonator comprises a body made of solid dielectric material and a debugging hole which is positioned on the surface of the body and is used for debugging the resonant frequency; the negative coupling hole is positioned on the first surface of the body at the connecting position of the two dielectric resonators, and the depth of the negative coupling hole is smaller than that of the debugging holes of the two dielectric resonators; the negative coupling groove is positioned on the second surface of the body at the connecting position of the two dielectric resonators; the first surface and the second surface of the body are two surfaces which are oppositely arranged along the depth direction of the body respectively; the metalized conducting layer covers the surface of the dielectric resonator body, the surface of the debugging hole, the surface of the negative coupling hole and the surface of the negative coupling groove; the negative coupling hole and the negative coupling groove are matched to realize negative coupling between the two dielectric resonators. The utility model discloses a problem of negative coupling debugging negative coupling volume difficulty between the solid dielectric resonator has been solved to negative coupling structure and dielectric filter.
Description
Technical Field
The utility model relates to a communication equipment subassembly, concretely relates to negative coupling structure and dielectric filter.
Background
At present, there is a miniaturized filter, which uses a body made of solid dielectric material and a resonator (referred to as "solid dielectric resonator" for short) formed by metallizing (e.g. silver plating) the surface of the body, and a plurality of resonators and coupling between the resonators form a filter (referred to as "solid dielectric filter" for short). The coupling between the resonators can be classified into positive coupling (also referred to as "inductive coupling") and negative coupling (also referred to as "capacitive coupling") according to polarity, and a transmission zero can be formed based on the coupling polarity between the resonators. The transmission zero is a frequency point outside the passband of the filter, the signal rejection of the filter to the frequency point at the frequency point is theoretically infinite, and the transmission zero is increased, so that the near-end rejection capability of the filter (namely the rejection capability of the frequency point closer to the passband) can be effectively enhanced. For example, in a three-cavity filter, the coupling between resonators 1 and 2, 2 and 3, and 1 and 3 is positive coupling, and the transmission zero is formed on the right side of the passband, whereas if the coupling between resonators 1 and 2, 2 and 3 is positive coupling and the coupling between resonators 1 and 3 is negative coupling, the transmission zero is on the left side of the passband.
In order to realize negative coupling, a structure shown in fig. 1 is currently adopted in a solid dielectric filter, a negative coupling hole is designed between two connected solid dielectric resonators, both the two solid dielectric resonators are provided with debugging holes, the depth of the negative coupling hole is greater than that of the debugging holes on both sides of the negative coupling hole, and is usually twice or more than twice the depth of the debugging holes on both sides of the negative coupling hole, so that the resonance frequency of the resonator can be lower than that of the resonators on both sides of the negative coupling hole, and is usually half or less than half of the resonance frequency of the resonators on both sides of the negative coupling hole, and negative coupling can be formed between the two solid dielectric resonators. The design can not only generate negative coupling, but also adjust the coupling amount of the negative coupling, the adjusting mode is to change the area of the surface of the negative coupling hole covered by the conducting layer, generally, in order to facilitate debugging, the conducting layer is completely covered on the surface of the designed negative coupling hole (the coupling amount of the negative coupling is larger at the moment), and then the grinding head is used for deep grinding the bottom of the negative coupling hole to reduce the area covered by the conducting layer, so as to reduce the coupling amount of the negative coupling. Because the depth of the negative coupling hole is far greater than that of the debugging hole, and the depth of the debugging hole is related to the resonant frequency of the resonator, in order to meet the requirements of certain resonant frequencies, the depth of the debugging hole is relatively deep, and the depth of the negative coupling hole is at least twice of that of the debugging hole, so that the realization process for subsequently adjusting the negative coupling quantity is quite difficult.
Disclosure of Invention
An embodiment of the utility model provides a negative coupling structure has solved the problem of the negative coupling debugging negative coupling volume difficulty between the current solid dielectric resonator.
In order to solve the above technical problems, the present invention provides a negative coupling structure, which comprises,
each dielectric resonator comprises a body made of a solid dielectric material and debugging holes positioned on the surface of the body, wherein the debugging holes are blind holes and used for debugging the resonance frequency of the dielectric resonator in which the debugging holes are positioned;
the negative coupling hole is positioned on the first surface of the body at the connecting position of the two dielectric resonators, the negative coupling hole is connected with the two dielectric resonators, and the depth of the negative coupling hole is smaller than that of the debugging holes of the two dielectric resonators;
the negative coupling groove is positioned on the second surface of the body at the connecting position of the two dielectric resonators, is connected with the two dielectric resonators, and is a blind groove in the depth direction of the body and a through groove in the width direction of the body; the first surface and the second surface of the body are two surfaces which are oppositely arranged along the depth direction of the body respectively;
the metalized conducting layer covers the surface of the dielectric resonator body, the surface of the debugging hole, the surface of the negative coupling hole and the surface of the negative coupling groove;
and the negative coupling hole and the negative coupling groove are matched to realize negative coupling between the two dielectric resonators.
In a preferred embodiment of the present invention, the negative coupling hole is included in the area of the negative coupling groove along the projection of the body in the depth direction.
In a preferred embodiment of the present invention, the solid dielectric material is ceramic.
In order to solve the above technical problems, the present invention provides a dielectric filter, including,
each dielectric resonator comprises a body made of a solid dielectric material and debugging holes positioned on the surface of the body, wherein the debugging holes are blind holes and used for debugging the resonance frequency of the dielectric resonator in which the debugging holes are positioned; the bodies of all the dielectric resonators included in the dielectric filter constitute the body of the dielectric filter;
each negative coupling hole is positioned on the first surface of the body at the connecting position of the two dielectric resonators, the negative coupling hole is connected with the two dielectric resonators, and the depth of the negative coupling hole is smaller than that of the debugging holes of the two dielectric resonators connected with each other at the position of the negative coupling hole;
each negative coupling groove is positioned on the second surface of the body at the connecting position of the two dielectric resonators and is connected with the two dielectric resonators, and the negative coupling grooves are blind grooves in the depth direction of the body and through grooves in the width direction of the body; the first surface and the second surface of the body are two surfaces which are oppositely arranged along the depth direction of the body respectively;
and a metallized conductive layer covering the surface of the dielectric filter body, the surface of the debugging hole, the surface of the negative coupling hole and the surface of the negative coupling groove;
and the negative coupling hole and the negative coupling groove are matched to realize negative coupling between the two dielectric resonators.
In a preferred embodiment of the present invention, the negative coupling hole is included in the area of the negative coupling groove along the projection of the body in the depth direction.
The utility model discloses a preferred embodiment, further include the number in negative coupling groove and the number in negative coupling hole all with dielectric filter transmission zero's number is the same.
In a preferred embodiment of the present invention, it further includes that two dielectric resonators connected to the position of the negative coupling hole or the negative coupling slot are related to the frequency of the transmission zero point of the dielectric filter.
In a preferred embodiment of the present invention, the solid dielectric material is ceramic.
The utility model has the advantages that:
the embodiment of the utility model provides a negative coupling structure, dielectric filter realize the negative coupling through the mode of processing blind groove cooperation negative coupling hole on the body made by solid-state dielectric material for the degree of depth in negative coupling hole is less than the degree of depth in debugging hole, has simplified the debugging technology of adjusting the negative coupling volume between two solid dielectric syntonizers.
Drawings
Fig. 1 is a schematic cross-sectional view of a solid dielectric resonator provided in the prior art to implement a negative coupling structure;
fig. 2 is a perspective view of a first view angle of a negative coupling structure in a first embodiment of the present invention;
fig. 3 is a perspective view of a second view angle of the negative coupling structure in the first embodiment of the present invention;
fig. 4 is a schematic cross-sectional view of a negative coupling structure according to a first embodiment of the present invention;
fig. 5 is a schematic diagram of a dielectric filter according to a second embodiment of the present invention for implementing a negative coupling structure.
The reference numbers in the figures illustrate:
in a first embodiment: 11, 12-dielectric resonator, 13, 14-tuning hole, 15-negative coupling hole, 16-body first surface, 17-body second surface, 18-negative coupling groove, 19-body, 20-conducting layer.
Second to fourth embodiments: 21, 22-dielectric resonator, 23, 24-tuning hole, 25-negative coupling hole, 26-body first surface, 27-body second surface, 28-negative coupling groove, 29-body, 30-conductive layer.
Detailed Description
The present invention is further described with reference to the following drawings and specific embodiments so that those skilled in the art can better understand the present invention and can implement the present invention, but the embodiments are not to be construed as limiting the present invention.
Example one
The present embodiment provides a negative coupling structure, as shown in fig. 2 to 4, the negative coupling structure includes two dielectric resonators (11, 12), each dielectric resonator (11, 12) includes a body 19 made of a solid dielectric material and a blind hole (called a debugging hole (13, 14) for short) located on a surface of the body for debugging a resonant frequency;
the negative coupling structure also comprises a negative coupling hole 15 and a negative coupling groove 18 which are used for realizing negative coupling (or capacitive coupling) between the two dielectric resonators (11, 12), wherein the negative coupling hole 15 is positioned on the first surface 16 of the body at the connecting position of the two dielectric resonators (11, 12) and is positioned to be connected with the two dielectric resonators (11, 12); the negative coupling groove 18 is a blind groove in the depth direction of the body, a through groove in the width direction of the body, a second surface 17 of the body located at the connecting position of the two dielectric resonators (11, 12) and located at the connecting position of the two dielectric resonators (11, 12), and the first surface 16 and the second surface 17 of the body are two surfaces oppositely arranged along the depth direction of the body.
The negative coupling structure further comprises a metalized conductive layer 20 covering the surface of the dielectric resonator body, the surface of the debugging hole, the surface of the negative coupling hole and the surface of the negative coupling groove.
Typically, the negative coupling hole 15 is located on the first surface of the body in the middle of the two tuning holes, the negative coupling hole 15 and the body around it forming a structure similar to a resonator, the negative coupling hole 15 being similar to the tuning hole of the resonator. The negative coupling groove 18 is positioned on the second surface of the body between the two debugging holes; wherein the projection of the negative coupling hole 15 in the depth direction of the body is contained in the region where the negative coupling groove 18 is located. This negative coupling groove is the groove structure of the sunken formation of body second surface to the body inside, this negative coupling groove 18 extends to negative coupling hole 15 direction promptly, can reduce the distance of negative coupling hole 15 and body second surface, this distance reduces and makes equivalent capacitance increase, thereby under the condition that the degree of depth of negative coupling hole 15 is less than both sides debugging hole degree of depth, the resonant frequency of the resonator that negative coupling hole 15 is located is less than the resonant frequency of both sides debugging hole place resonator, thereby make and form negative coupling (or capacitive coupling) between dielectric resonator 11 and the dielectric resonator 12.
The conductive layer 20 may be a metalized layer, and may be formed by plating a metal on the surface of the body, where the metal may be silver, or may be other metals meeting practical requirements, such as gold and copper.
The dielectric material used in the negative coupling structure provided by the above embodiment is preferably ceramic, and the ceramic has a high dielectric constant (dielectric constant of 36), and good hardness and high temperature resistance. Of course, other materials known to those skilled in the art, such as glass, electrically insulating polymers, etc., may be used as the dielectric material.
Example two
The present embodiment provides a dielectric filter, as shown in fig. 5, the dielectric filter includes at least two dielectric resonators (21, 22), each dielectric resonator (21, 22) includes a body 29 made of a solid dielectric material and a blind hole short (tuning hole (23, 24)) located on the surface of the body for tuning the resonant frequency, the bodies of all the dielectric resonators included in the dielectric filter constitute the body of the dielectric filter;
the dielectric filter further includes at least one negative coupling hole 25 and at least one negative coupling groove 28 for achieving negative coupling between the dielectric resonator 21 and the dielectric resonator 22 in cooperation; the negative coupling hole 25 is located on the first surface 26 of the body at the connecting position of the two dielectric resonators, and is located at a position where it is connected to the two dielectric resonators; the negative coupling slot 18 is a blind slot in the depth direction of the body, a through slot in the width direction of the body, a second surface 27 of the body, which is located at the connecting position of the two dielectric resonators and is connected with the two dielectric resonators, and the first surface 26 of the body and the second surface 27 of the body are two surfaces oppositely arranged in the depth direction of the body respectively;
the dielectric filter further comprises a metallized conductive layer 30 covering the surface of the dielectric filter body, the surface of the tuning hole, the surface of the negative coupling hole and the surface of the negative coupling groove.
Typically, the negative coupling aperture 25 is located on the first surface of the body intermediate the two tuning apertures, the negative coupling aperture and its surrounding body forming a structure similar to a resonator, the negative coupling aperture being similar to the tuning aperture of the resonator. The negative coupling groove 28 is located on the second surface of the body between the two debugging holes; wherein the projection of the negative coupling hole 25 in the depth direction of the body is contained in the region where the negative coupling groove 28 is located. This negative coupling groove 28 is the groove structure of the sunken formation of body from the body second surface to the body inside, this negative coupling groove 28 extends to negative coupling hole 25 direction promptly, can reduce the distance of negative coupling hole 25 and body second surface, this distance reduces and makes equivalent capacitance increase, thereby under the condition that the degree of depth of negative coupling hole 25 is less than both sides debugging hole degree of depth, the resonant frequency of the resonator that negative coupling hole 25 is located is less than the resonant frequency of the resonator that both sides debugging hole are located, thereby make and form negative coupling (or capacitive coupling) between dielectric resonator 21 and the dielectric resonator 22.
The depth of the negative coupling hole 25 and the depth of the negative coupling groove 28 are both related to the frequency of the transmission zero of the dielectric filter. Specifically, the depth of the negative coupling hole may be designed according to practical requirements, such as the frequency of the transmission zero, and is not limited herein. Generally, the number of the negative coupling holes between the two dielectric resonators is 1, and the number of the negative coupling grooves is 1, so that one transmission zero point is realized. The number of the negative coupling holes and the negative coupling grooves on the dielectric filter can be one or more, and the number and the positions of the negative coupling holes and the negative coupling grooves (which is positioned between two resonators) can be determined according to the number and the frequency of transmission zeros actually required. Specifically, the number of the negative coupling holes and the number of the negative coupling grooves are equal to the number of transmission zeros of the dielectric filter, and the two dielectric resonators connected with each other at the positions of the negative coupling holes and the negative coupling grooves are determined according to the frequency of the transmission zeros of the dielectric filter. It should be noted here that the negative coupling hole and the negative coupling groove forming the negative coupling structure are always present together, and cooperate to form the negative coupling structure.
The conductive layer 20 may be a metalized layer, and may be formed by plating a metal on the surface of the body, where the metal may be silver, or may be other metals meeting practical requirements, such as gold and copper.
During specific manufacturing, the body with the debugging hole, the negative coupling hole and the negative coupling groove can be obtained through integrated molding, and then the surface metallization is carried out on the body, so that the dielectric filter is obtained. In this way, the body of the dielectric resonator comprised by the dielectric filter is continuous. The dielectric filter is obtained by adopting an integrated molding mode, so that the processing technology is simpler.
The dielectric material used in the negative coupling structure provided by the above embodiment is preferably ceramic, and the ceramic has a high dielectric constant (dielectric constant of 36), and good hardness and high temperature resistance. Of course, other materials known to those skilled in the art, such as glass, electrically insulating polymers, etc., may be used as the dielectric material.
The above-mentioned embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. Equivalent substitutes or changes made by the technical personnel in the technical field on the basis of the utility model are all within the protection scope of the utility model. The protection scope of the present invention is subject to the claims.
Claims (8)
1. A negative coupling structure, characterized by: comprises the steps of (a) preparing a mixture of a plurality of raw materials,
each dielectric resonator comprises a body made of a solid dielectric material and debugging holes positioned on the surface of the body, wherein the debugging holes are blind holes and used for debugging the resonance frequency of the dielectric resonator in which the debugging holes are positioned;
the negative coupling hole is positioned on the first surface of the body at the connecting position of the two dielectric resonators, the negative coupling hole is connected with the two dielectric resonators, and the depth of the negative coupling hole is smaller than that of the debugging holes of the two dielectric resonators;
the negative coupling groove is positioned on the second surface of the body at the connecting position of the two dielectric resonators, is connected with the two dielectric resonators, and is a blind groove in the depth direction of the body and a through groove in the width direction of the body; the first surface and the second surface of the body are two surfaces which are oppositely arranged along the depth direction of the body respectively;
the metalized conducting layer covers the surface of the dielectric resonator body, the surface of the debugging hole, the surface of the negative coupling hole and the surface of the negative coupling groove;
and the negative coupling hole and the negative coupling groove are matched to realize negative coupling between the two dielectric resonators.
2. The negative coupling structure of claim 1, wherein: the projection of the negative coupling hole in the depth direction of the body is contained in the region of the negative coupling groove.
3. The negative coupling structure of claim 1, wherein: the solid dielectric material is ceramic.
4. A dielectric filter, characterized by: comprises the steps of (a) preparing a mixture of a plurality of raw materials,
each dielectric resonator comprises a body made of a solid dielectric material and debugging holes positioned on the surface of the body, wherein the debugging holes are blind holes and used for debugging the resonance frequency of the dielectric resonator in which the debugging holes are positioned; the bodies of all the dielectric resonators included in the dielectric filter constitute the body of the dielectric filter;
each negative coupling hole is positioned on the first surface of the body at the connecting position of the two dielectric resonators, the negative coupling hole is connected with the two dielectric resonators, and the depth of the negative coupling hole is smaller than that of the debugging holes of the two dielectric resonators connected with each other at the position of the negative coupling hole;
each negative coupling groove is positioned on the second surface of the body at the connecting position of the two dielectric resonators and is connected with the two dielectric resonators, and the negative coupling grooves are blind grooves in the depth direction of the body and through grooves in the width direction of the body; the first surface and the second surface of the body are two surfaces which are oppositely arranged along the depth direction of the body respectively;
and a metallized conductive layer covering the surface of the dielectric filter body, the surface of the debugging hole, the surface of the negative coupling hole and the surface of the negative coupling groove;
and the negative coupling hole and the negative coupling groove are matched to realize negative coupling between the two dielectric resonators.
5. A dielectric filter as recited in claim 4, wherein: the projection of the negative coupling hole in the depth direction of the body is contained in the region of the negative coupling groove.
6. A dielectric filter as recited in claim 4, wherein: the number of the negative coupling grooves and the number of the negative coupling holes are the same as the number of transmission zeros of the dielectric filter.
7. A dielectric filter as recited in claim 4, wherein: and the two dielectric resonators connected with each other at the positions of the negative coupling holes or the negative coupling grooves are related to the frequency of the transmission zero point of the dielectric filter.
8. A dielectric filter as recited in claim 4, wherein: the solid dielectric material is ceramic.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921096697.1U CN210074111U (en) | 2019-07-12 | 2019-07-12 | Negative coupling structure and dielectric filter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921096697.1U CN210074111U (en) | 2019-07-12 | 2019-07-12 | Negative coupling structure and dielectric filter |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111244589A (en) * | 2020-02-24 | 2020-06-05 | 江苏灿勤科技股份有限公司 | Dielectric filter and radio transceiver |
| CN111799535A (en) * | 2020-07-06 | 2020-10-20 | 武汉凡谷陶瓷材料有限公司 | Capacitive coupling device and filter |
| CN112072240A (en) * | 2020-08-28 | 2020-12-11 | 潮州三环（集团）股份有限公司 | Dielectric waveguide filter and manufacturing method thereof |
-
2019
- 2019-07-12 CN CN201921096697.1U patent/CN210074111U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111244589A (en) * | 2020-02-24 | 2020-06-05 | 江苏灿勤科技股份有限公司 | Dielectric filter and radio transceiver |
| CN111799535A (en) * | 2020-07-06 | 2020-10-20 | 武汉凡谷陶瓷材料有限公司 | Capacitive coupling device and filter |
| CN112072240A (en) * | 2020-08-28 | 2020-12-11 | 潮州三环（集团）股份有限公司 | Dielectric waveguide filter and manufacturing method thereof |
| CN112072240B (en) * | 2020-08-28 | 2021-11-16 | 潮州三环（集团）股份有限公司 | Dielectric waveguide filter and manufacturing method thereof |
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