CN113300061A - Negative coupling structure applied to dielectric waveguide filter - Google Patents
Negative coupling structure applied to dielectric waveguide filter Download PDFInfo
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- CN113300061A CN113300061A CN202010111066.3A CN202010111066A CN113300061A CN 113300061 A CN113300061 A CN 113300061A CN 202010111066 A CN202010111066 A CN 202010111066A CN 113300061 A CN113300061 A CN 113300061A
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- 230000008878 coupling Effects 0.000 title claims abstract description 169
- 238000010168 coupling process Methods 0.000 title claims abstract description 169
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 169
- 230000001939 inductive effect Effects 0.000 claims abstract description 27
- 238000010295 mobile communication Methods 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 230000001808 coupling effect Effects 0.000 description 3
- 239000003989 dielectric material Substances 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 230000001902 propagating effect Effects 0.000 description 2
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 229910010293 ceramic material Inorganic materials 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
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- 238000006467 substitution reaction Methods 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/2002—Dielectric waveguide filters
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Abstract
The invention discloses a negative coupling structure applied in a dielectric waveguide filter, which is characterized in that a long blind hole is formed on a first surface of a dielectric body to construct the negative coupling structure, a plurality of tuning holes are formed on the first surface or a second surface of the dielectric body, and the negative coupling structure is defined in the dielectric body based on a first coupling part correspondingly constructed on the bottom wall of the long blind hole, a second coupling part correspondingly constructed on a side wall and a common coupling part connecting the bottom wall and the side wall, so that capacitive coupling and inductive coupling can exist simultaneously, the negative coupling is realized, the dielectric waveguide filter is lightened, and the purposes of small volume, good performance, simple structure and easy processing are achieved.
Description
Technical Field
The present invention relates to a filter structure having both capacitive coupling and inductive coupling in the field of communications, and more particularly, to a negative coupling structure for use in a dielectric waveguide filter.
Background
The mobile communication base station completes the conversion between the baseband signal and the radio frequency signal mainly by the relevant processing unit. As for the antenna of the mobile communication base station, the antenna is used as a conversion medium between electromagnetic wave radiation propagating in the space and signals transmitted in the circuit, and the antenna radiates the electromagnetic wave into the space to transmit the signals or receives the electromagnetic wave propagating in the space to receive the signals.
In an rf processing unit of a mobile communication base station, a filter coupled to an antenna is used to assist the base station in filtering out unwanted bands for receiving or transmitting specific electromagnetic waves. In the third and fourth generation mobile communication technologies (3G/4G), the filter is mainly made by disposing a metal coaxial cavity, and the unwanted band is eliminated by using the transmission and oscillation in the cavity, but the size of this type of filter is relatively large, which is difficult to be applied to the fifth generation mobile communication technology (5G) requiring a mobile communication base station to be widely built.
The dielectric waveguide filter is designed to allow the resonance phenomenon to occur inside the dielectric material (e.g., ceramic material), and thus the resonance phenomenon does not penetrate the inside of the metal coaxial cavity, thereby reducing the size of the filter. However, the dielectric waveguide filter is made of a solid dielectric material, and cannot be flexibly adjusted as a filter made of a metal coaxial cavity, and it is difficult to form a transmission zero point and achieve negative coupling by coupling between cavities in a miniaturized dielectric waveguide filter.
Disclosure of Invention
An object of the present invention is to realize negative coupling by allowing both capacitive coupling and inductive coupling in a dielectric waveguide filter.
Another object of the present invention is to reduce the weight of a dielectric waveguide filter.
Still another object of the present invention is to provide a negative coupling structure with small volume, good performance, simple structure and easy processing.
In order to achieve the above and other objects, the present invention provides a negative coupling structure for use in a dielectric waveguide filter, the dielectric waveguide filter includes a dielectric body, the dielectric body is provided with a plurality of tuning holes and the negative coupling structure, the negative coupling structure is an elongated blind hole located on a first surface of the dielectric body and is located between two adjacent tuning holes, the tuning holes are blind holes located on the first surface of the dielectric body or a second surface opposite to the first surface, and the negative coupling structure includes: a first coupling part, a second coupling part and a common coupling part. The first coupling portion is defined within the dielectric body and is a bottom wall of the elongated blind hole. The second coupling portion is defined in the dielectric body and is a sidewall of one of two ends of the elongated blind hole. The public coupling part is used for connecting the first coupling part and the second coupling part, is defined at one end of the two ends of the long blind hole and is a connecting wall for connecting the bottom wall and the side wall.
In an embodiment of the present invention, the dielectric body includes an inductive coupling structure penetrating through the dielectric body, and the inductive coupling structure provides inductive coupling between two adjacent tuning holes except the two tuning holes adjacent to the negative coupling structure.
In an embodiment of the invention, the other end of the two ends of the long blind hole is communicated with the inductive coupling structure. The inductive coupling structure may be T-shaped.
In an embodiment of the invention, the first coupling portion, the second coupling portion and the common coupling portion are connected to form an L-shaped structure, and the first coupling portion, the second coupling portion and the common coupling portion surround the elongated blind hole.
In an embodiment of the invention, a wall thickness of a bottom wall of the first coupling portion in the dielectric body is d1, a thickness of the dielectric body is d, and d1< d/3. The thinnest position of the wall thickness of the side wall of the second coupling part in the medium body is d2, and the length of the elongated blind hole is d3, d2< (d2+ d 3)/3.
In an embodiment of the invention, a symmetric slot is further included on the second surface of the medium body opposite to the elongated blind hole, a wall body serving as a slot bottom of the symmetric slot is the bottom wall of the elongated blind hole, the other end of the wall body at two ends of the elongated blind hole is provided with a first notch, the symmetric slot offsets the bottom wall of the elongated blind hole serving as the first coupling portion toward the center of the medium body, the length of the bottom wall of the elongated blind hole is shorter than that of the elongated blind hole by the first notch, a slot opening of the symmetric slot is communicated with a side surface of the medium body, the side wall of the second coupling portion at one end of the two ends of the elongated blind hole is provided with a second notch, and the elongated blind hole is communicated with the side surface of the medium body by the second notch.
In an embodiment of the present invention, in the elongated blind hole, two protruding ribs are protruded from the bottom wall of the elongated blind hole inward of the blind hole, and a step-shaped protruding rib structure is protruded from a connection portion of the first coupling portion and the second coupling portion.
In an embodiment of the invention, the thinnest part of the wall thickness of the bottom wall of the first coupling part in the dielectric body is d1, the thickness of the dielectric body is d, and d1< d/3. The thinnest position of the wall thickness of the side wall of the second coupling part in the medium body is d2, the length of the elongated blind hole is d3, the length of the bottom wall of the elongated blind hole is d4, d4>4(d2+ d3)/5, and d2< (d2+ d 3)/3.
In an embodiment of the invention, the length of the sidewall formed by the second coupling portion and the common coupling portion at the one end of the two ends of the elongated blind hole is greater than 1/3 of the thickness of the dielectric body.
Therefore, the negative coupling structure applied to the dielectric waveguide filter is constructed by forming the long blind hole on the first surface of the dielectric body, the first surface or the second surface of the dielectric body is used for forming the plurality of tuning holes, capacitive coupling and inductive coupling correspondingly exist in the dielectric body at the same time based on the structural shape of each coupling part, the negative coupling is realized, the dielectric waveguide filter is lightened, and the purposes of small volume, good performance, simple structure and easiness in processing are achieved.
Drawings
Fig. 1 is a schematic perspective view of a dielectric waveguide filter according to an embodiment of the present invention.
Fig. 2 is a schematic perspective view of fig. 1 from another angle.
Fig. 3 is a schematic cross-sectional view of fig. 1 at AA.
Fig. 4 is a schematic plan view enlarged for the negative coupling structure in fig. 3.
Fig. 5 is a schematic perspective view of a dielectric waveguide filter according to another embodiment of the present invention.
Fig. 6 is a schematic perspective view of fig. 5 from another angle.
Fig. 7 is a schematic cross-sectional structure of fig. 5 at BB section.
Fig. 8 is a schematic enlarged plan view of fig. 7 for the negative coupling structure.
Description of the symbols:
100 dielectric body
101 upper surface
102 lower surface
103 side surface
110 tuning hole
110a first tuning hole
110b second tuning hole
110c third tuning hole
110d fourth tuning hole
120 inductive coupling structure
130 signal output/input section
140 negative coupling structure
140a of an elongated blind hole
140b another end of the elongated blind hole
1401 first recess
1402 second recess
1403 rib
1404 stepped rib structure
141 first coupling part
142 second coupling part
143 common coupling part
144 symmetrical groove
1441 notch
d thickness of dielectric body
Wall thickness of bottom wall of elongated blind hole of d1
Wall thickness of d2 elongated blind hole
Length of d3 elongated blind hole
d4 bottom wall length of elongated blind hole
d5 side wall length of elongated blind hole
AA section
BB section
Detailed Description
For a fuller understanding of the objects, features and advantages of the present invention, reference should be made to the following detailed description taken in conjunction with the accompanying drawings, in which:
as used herein, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a term does not include a limitation, but includes a limitation, such that a component, structure, region, or area is not expressly listed.
As used herein, the terms "first," "second," and the like are used for distinguishing or referring to the same elements or structures, and do not necessarily imply a spatial order to the elements, structures, regions, or regions. It should be understood that in some cases or configurations, ordinal terms are used interchangeably without affecting the practice of the invention.
Referring to fig. 1 and fig. 2, fig. 1 is a schematic perspective view of a dielectric waveguide filter according to an embodiment of the present invention, and fig. 2 is a schematic perspective view of fig. 1 from another viewing angle. The dielectric waveguide filter includes a dielectric body 100, and a plurality of tuning holes 110 for tuning a resonance frequency are provided in an upper surface 101 of the dielectric body 100. The tuning holes 110 are blind holes, and the shape is not limited, and in this embodiment, circular blind holes are taken as an example. In addition, the dielectric body 100 includes an inductive coupling structure 120 penetrating through the dielectric body 100, and the inductive coupling structure 120 is illustrated as a T-shaped structure in this embodiment.
Taking the example of fig. 1 and 2 as an example, the upper surface 101 of the dielectric body 100 is provided with a first tuning hole 110a, a second tuning hole 110b, a third tuning hole 110c, and a fourth tuning hole 110 d. Inductive coupling is formed between the first tuning hole 110a and the second tuning hole 110b, and between the third tuning hole 110c and the fourth tuning hole 110d through the inductive coupling structure 120. By providing the tuning holes, the frequency of the signal can be tuned in the dielectric body 100, and the signal can be transmitted or received from the signal input/output unit 130. One of the two signal input/output units 130 shown in fig. 2 is used for signal output (output terminal), and the other is used for receiving a signal (input terminal).
An embodiment of the present invention features a negative coupling structure 140 on the lower surface 102 of the media body 100. The negative coupling structure 140 is disposed between two adjacent tuning holes, i.e., between the second tuning hole 110b and the third tuning hole 110 c. The negative coupling structure 140 is an elongated blind hole with an opening at the lower surface 102 of the dielectric body 100 and at a different surface of the dielectric body 100 than the openings of the tuning holes 110.
The surface of the dielectric body 100 is plated with a metal conductive layer (e.g., silver plating), and the inner walls of the blind holes and tuning holes are also plated with the metal conductive layer. The depth of the elongated blind hole of the negative coupling structure 140 is determined based on the required coupling amount, but the structure configuration of the embodiment of the present invention has a better coupling effect.
Next, referring to fig. 3 and fig. 4, fig. 3 is a schematic cross-sectional view of fig. 1 at the AA cross section, and fig. 4 is an enlarged schematic plan view of the negative coupling structure in fig. 3. The negative coupling structure 140 includes: a first coupling part 141, a second coupling part 142, and a common coupling part 143. The first coupling portion 141, the second coupling portion 142 and the common coupling portion 143 are connected to form an L-shaped structure, and the first coupling portion 141, the second coupling portion 142 and the common coupling portion 143 surround a portion of the elongated blind hole.
The first coupling portion 141 is defined in the dielectric body 100 and serves as a bottom wall of the elongated blind hole, i.e., a wall of the hole bottom. The second coupling portion 142 is defined in the dielectric body 100 and is a sidewall of one end 140a of the two ends (140a, 140b) of the elongated blind hole, i.e., a wall on the hole side. The common coupling portion 143 connects the first coupling portion 141 and the second coupling portion 142, the common coupling portion 143 is defined at the one end 140a of the two ends (140a, 140b) of the elongated blind hole, and is a connecting wall connecting the bottom wall and the side wall of the elongated blind hole, and the outer wall surface of the connecting wall includes the upper surface 101 and the side surface 103 of the dielectric body 100. In addition, the other end 140b of the two ends of the elongated blind hole of the negative coupling structure 140 is connected to the inductive coupling structure 120 (see also fig. 2).
The first coupling portion 141 and the common coupling portion 143, in the negative coupling structure of the dielectric waveguide filter according to the embodiment of the present invention, serve to generate a capacitive coupling function and serve as a capacitive coupling region. The second coupling portion 142 and the common coupling portion 143, in the negative coupling structure of the dielectric waveguide filter in the embodiment of the present invention, are used to generate the effect of inductive coupling, and serve as an inductive coupling region.
The capacitive coupling may couple the cavities in the dielectric body 100 to generate a capacitive effect, so that a cancellation effect after phase superposition is generated between a signal passing through the capacitive coupling region and a signal not passing through the capacitive coupling region (for example, a signal passing through the inductive coupling region), thereby achieving an effect of a transmission zero point and enhancing a suppression efficiency of the filter.
In the embodiment of fig. 1 to 4, four tuning holes 110a to 110d are illustrated, and the inductive coupling structure 120 is configured to provide inductive coupling between two adjacent tuning holes (between the first tuning hole 110a and the second tuning hole 110b, and between the third tuning hole 110c and the fourth tuning hole 110 d) of the remaining tuning holes except for the two tuning holes (110b and 110c) adjacent to the negative coupling structure 140.
Referring to fig. 4, with further improvement of the coupling effect, when the wall thickness of the bottom wall of the first coupling portion 141 in the dielectric body 100 is d1, and the thickness of the dielectric body is d, d1 may be smaller than d/3. When the thinnest point of the sidewall wall thickness of the second coupling portion 142 in the dielectric body 100 is d2, and the length of the elongated blind hole is d3, d2 may be smaller than (d2+ d 3)/3. Therefore, the negative coupling structure 140 implemented in the dielectric waveguide filter can make the coupling window designed in a special form, so that the capacitive and inductive coupling exist simultaneously, and the negative coupling structure 140 can generate better negative coupling effect by adjusting the certain ratio.
Next, referring to fig. 5 to 8, fig. 5 is a schematic perspective view of a dielectric waveguide filter according to another embodiment of the present invention; FIG. 6 is a perspective view of FIG. 5 from another perspective; FIG. 7 is a schematic cross-sectional view of FIG. 5 at the BB section; fig. 8 is a schematic enlarged plan view of fig. 7 for the negative coupling structure.
Fig. 5 to 8 show another embodiment of the present invention, which is also provided with the negative coupling structure of the previous embodiment, but is further constructed with less dielectric material.
As shown in fig. 8, a symmetrical slot 144 is further included at the upper surface 101 of the dielectric body 100 opposite the elongated blind hole of the negative coupling structure 140. The wall of the groove bottom of the symmetrical groove 144 is also the wall of the bottom wall of the elongated blind hole. In addition, the wall has a first notch 1401 at the other end 140b of the two ends (140a, 140b) of the elongated blind hole. The symmetrical slots 144 are arranged such that the bottom wall of the elongated blind hole as the first coupling portion 141 is offset toward the center of the dielectric body 100, i.e., the bottom wall of the elongated blind hole can be closer to the center of the dielectric body 100 and the bottom wall of the elongated blind hole can be thinner.
Based on the arrangement of the first notch 1401, the bottom wall length d4 of the elongated blind hole may be shorter than the length d3 of the elongated blind hole. The notches 1441 of the symmetrical grooves 144 may communicate with the side surface 103 of the media body 100. The second coupling portion 142 has a second recess 1402 in the sidewall of the one end 140a of the two ends (140a, 140b) of the elongated blind hole, the second recess 1402 allowing the elongated blind hole to communicate with the side surface 103 of the media body 100.
Further, in the elongated blind hole, two convex ribs 1403 may be protruded from the bottom wall of the elongated blind hole toward the inside of the blind hole. The two ribs 1403 substantially traverse the bottom of the elongated blind hole in a direction perpendicular to the direction of extension of the elongated blind hole. In addition, a stepped rib structure 1404 is protruded from the connection between the first coupling portion 141 and the second coupling portion 142 and located in the hole of the elongated blind hole.
Similarly, as shown in FIG. 8, when the wall thickness of the bottom wall of the first coupling portion 141 in the dielectric body 100 is d1 at the thinnest point, and the thickness of the dielectric body 100 is d, d1 may be smaller than d/3. When the thinnest point of the sidewall wall thickness of the second coupling portion 142 in the dielectric body 100 is d2, the length of the elongated blind hole is d3, and the length of the bottom wall of the elongated blind hole is d4, d4 may be greater than 4(d2+ d3)/5, and d2 may be smaller than (d2+ d 3)/3. In addition, the length d5 of the sidewall formed by the second coupling portion 142 and the common coupling portion 143 at the one end 140a of the two ends (140a, 140b) of the elongated blind hole is greater than 3/4 of the thickness of the dielectric body 100, i.e., d5>3 d/4.
In other embodiments, which are relative to the embodiments of fig. 1 to 8, the negative coupling structure 140 can also be disposed on the upper surface 101 of the dielectric body 100, and the tuning holes 110 can be located on the upper surface 101 or the lower surface 102 of the dielectric body 100. When the tuning holes 110 are located on the lower surface 102 of the dielectric body 100, the signal input/output portion 130 is located on the upper surface 101.
In other words, the negative coupling structure 140 is an elongated blind hole located on the first surface of the dielectric body 100, and the negative coupling structure 140 is still located between two adjacent tuning holes 110 regardless of whether the negative coupling structure 140 is located on the same plane as the tuning holes 110 through the dielectric body 100. Thus, the tuning holes 110 are blind holes located on the first surface of the dielectric body 100 or blind holes located on a second surface opposite to the first surface. The first surface may be represented by the upper surface 101 or the lower surface 102, and correspondingly, the second surface may be represented by the lower surface 102 or the upper surface 101. To summarize, the negative coupling structure 140 may be disposed on the upper surface 101 or the lower surface 102 of the dielectric body 100.
In summary, in the embodiments disclosed in the present invention, based on the first coupling portion correspondingly constructed on the bottom wall of the elongated blind via, the second coupling portion correspondingly constructed on the side wall, and the common coupling portion connecting the bottom wall and the side wall, a negative coupling structure of a specific form is defined in the dielectric body, so that capacitive coupling and inductive coupling can exist simultaneously, and the negative coupling is realized, so that the dielectric waveguide filter is light in weight, and the purposes of small volume, good performance, simple structure and easy processing are achieved.
While the invention has been described in terms of preferred embodiments, it will be understood by those skilled in the art that the embodiments are illustrative only and should not be taken as limiting the scope of the invention. It is noted that equivalent variations and substitutions for the illustrated embodiments are intended to be included within the scope of the present invention. Therefore, the protection scope of the present invention is defined by the claims.
Claims (7)
1. A negative coupling structure for use in a dielectric waveguide filter, the dielectric waveguide filter comprising a dielectric body, the dielectric body having a plurality of tuning holes and the negative coupling structure disposed thereon, the negative coupling structure being an elongated blind hole located on a first surface of the dielectric body and disposed between two adjacent tuning holes, the tuning holes being blind holes located on the first surface of the dielectric body or a second surface opposite to the first surface, the negative coupling structure comprising:
a first coupling portion defined within the dielectric body and being a bottom wall of the elongated blind hole;
a second coupling portion defined in the dielectric body and being a sidewall of one of the two ends of the elongated blind hole; and
a common coupling portion connecting the first coupling portion and the second coupling portion, defined at the one end of the elongated blind hole at both ends thereof and being a connecting wall connecting the bottom wall and the side wall.
2. The negative coupling structure of claim 1, wherein said dielectric body includes an inductive coupling structure extending through said dielectric body, said inductive coupling structure providing inductive coupling between adjacent ones of said tuning holes except for said tuning holes adjacent said negative coupling structure.
3. The negative coupling structure of claim 2, wherein the other end of the two ends of the elongated blind hole is connected to the inductive coupling structure.
4. The negative coupling structure of claim 3, wherein the inductive coupling structure is T-shaped.
5. The negative coupling structure of claim 2, wherein the first coupling portion, the second coupling portion, and the common coupling portion are connected in an L-shaped configuration, the first coupling portion, the second coupling portion, and the common coupling portion being disposed around the elongated blind hole.
6. The negative coupling structure of claim 1, wherein the wall thickness of the bottom wall of the first coupling portion in the dielectric body is d1, the thickness of the dielectric body is d, d1< d/3.
7. The negative coupling structure of claim 6, wherein the thinnest point of the sidewall wall thickness of the second coupling portion in the dielectric body is d2, and the length of the elongated blind hole is d3, d2< (d2+ d 3)/3.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010111066.3A CN113300061A (en) | 2020-02-24 | 2020-02-24 | Negative coupling structure applied to dielectric waveguide filter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010111066.3A CN113300061A (en) | 2020-02-24 | 2020-02-24 | Negative coupling structure applied to dielectric waveguide filter |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110265754A (en) * | 2019-07-16 | 2019-09-20 | 深圳市国人射频通信有限公司 | A kind of dielectric waveguide filter |
| CN110444849A (en) * | 2019-09-09 | 2019-11-12 | 江苏亨鑫科技有限公司 | Its dielectric waveguide filter of a kind of negative coupled structure of dielectric resonator and application |
| CN209730123U (en) * | 2019-05-24 | 2019-12-03 | 武汉凡谷电子技术股份有限公司 | A kind of capacitive coupling device and the filter containing the capacitive coupling device |
| CN110729540A (en) * | 2019-10-22 | 2020-01-24 | 摩比科技（深圳）有限公司 | Dielectric waveguide filter capable of realizing capacitive negative coupling |
-
2020
- 2020-02-24 CN CN202010111066.3A patent/CN113300061A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN209730123U (en) * | 2019-05-24 | 2019-12-03 | 武汉凡谷电子技术股份有限公司 | A kind of capacitive coupling device and the filter containing the capacitive coupling device |
| CN110265754A (en) * | 2019-07-16 | 2019-09-20 | 深圳市国人射频通信有限公司 | A kind of dielectric waveguide filter |
| CN110444849A (en) * | 2019-09-09 | 2019-11-12 | 江苏亨鑫科技有限公司 | Its dielectric waveguide filter of a kind of negative coupled structure of dielectric resonator and application |
| CN110729540A (en) * | 2019-10-22 | 2020-01-24 | 摩比科技（深圳）有限公司 | Dielectric waveguide filter capable of realizing capacitive negative coupling |
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