WO2020171247A1 - A substrate waveguide filter and a coupling inversion structure thereof - Google Patents
A substrate waveguide filter and a coupling inversion structure thereof Download PDFInfo
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- WO2020171247A1 WO2020171247A1 PCT/KR2019/001964 KR2019001964W WO2020171247A1 WO 2020171247 A1 WO2020171247 A1 WO 2020171247A1 KR 2019001964 W KR2019001964 W KR 2019001964W WO 2020171247 A1 WO2020171247 A1 WO 2020171247A1
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- Prior art keywords
- separation line
- substrate
- coupling
- waveguide filter
- resonator
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P7/00—Resonators of the waveguide type
- H01P7/06—Cavity resonators
- H01P7/065—Cavity resonators integrated in a substrate
-
- 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
- H01P1/207—Hollow waveguide filters
- H01P1/208—Cascaded cavities; Cascaded resonators inside a hollow waveguide structure
- H01P1/2088—Integrated in a substrate
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P5/00—Coupling devices of the waveguide type
- H01P5/02—Coupling devices of the waveguide type with invariable factor of coupling
Definitions
- Embodiments of the present disclosure relate to RF filters, and more particularly to a substrate waveguide filter and a coupling inversion structure thereof.
- Substrate waveguide can substantially reduce product size and has advantages of high Q value and low temperature-drift, so it is a good miniaturization solution.
- the current substrate waveguide filter and cavity filter still have certain technical problems such as having a complicated structure of cross coupling (negative coupling), it is not flexible enough and it is difficult to implement.
- the current substrate waveguide filter generating cross coupling has the following three patterns:
- the first solution is a metal probe structure which can generate negative cross coupling.
- the substrate is required to be punched and then the probe is inserted into the substrate. This solution has difficulty on assembling and fixation even though it can generate negative cross coupling.
- the second solution is a structure with external microband lines which can generate negative cross coupling.
- the surface of the substrate block is brushed with silver to form microband lines and a probe is mounted which is connected with the substrate block resonator.
- this solution in one side increases components of product so that the assembly and fixation are both cumbersome and has low efficiency; in other side the intensity of cross coupling generated by the structure of this solution is too weak to be enhanced thereby increasing design difficulty.
- the third solution is the coupling polarity inversion scheme of the window.
- the technical problem exists in that it is necessary to weld different substrate blocks together, which has certain difficulty in the process and is not conducive to control cost.
- the object of the claimed invention is to provide a substrate waveguide filter and a coupling inversion structure thereof which can realize coupling polarity reversal without welding among resonators, and generate negative coupling and reduce the assembly tolerances caused by welding.
- the production precision is also improved and the integrated production of substrate filters can be performed.
- a coupling inversion structure of a substrate waveguide filter comprising:
- a first resonator having a substrate block of which the surface is covered a conduct layer
- a substrate window is disposed on the surface of said resonator to expose the substrate of said resonator for coupling between said resonator and other resonators;
- At least one hole structure for separating said substrate window are disposed in said substrate window, and a continuous separation line formed along the outer circumference of said hole structure in said substrate window is used to separate said substrate window, and the length dimension of said separation line is set to exceed a half wavelength of the operating frequency of said substrate waveguide filter to reverse the coupling polarity of said resonator.
- said hole structure is a blind hole or a through hole, and the inner surface of said blind hole or said through hole is brushed with silver.
- said continuous separation line at least includes a first separation line and a second separation line extending from an end of said first separation line, and the degree range of the angle formed by said first separation line and said second separation line is (0, 90°].
- said second separation line is connected with an end of said first separation line to make said separation line to appear a L-shape or V-shape.
- said separation line includes a third separation line extending from an end of said second separation line and said third separation line is parallel to said first separation line to make said separation line to appear a U-shape.
- said hole structure is set to two blind holes between which said third separation line is located, and said separation line further includes a fourth separation line extending from an end of said third separation line and said fourth separation line is parallel to said second separation line.
- said separation lines are said first separation line, said second separation line, said third separation line, said fourth separation line, and a pattern formed by connecting said first separation line, said second separation line, said third separation line and said fourth separation line in sequence with finite loops.
- said pattern is arcuate.
- substrate of said resonator is a ceramic material
- said conductive layer covered on said resonator is metallic silver
- a substrate waveguide filter which includes the coupling inversion structure is also provided.
- a substrate window is disposed on the resonator, and at least one hole structure for separating the substrate window are disposed in the substrate window, and the continuous separation line formed along the outer circumference of the hole structure in the substrate window is used to separate the substrate window, so as to reverse the coupling polarity of the resonator and generate a negative coupling.
- the production accuracy is improved, and the integrated production of the substrate filter can be performed.
- FIG. 1 is a structure schematic view of a first embodiment of a coupling inversion structure of a substrate waveguide filter according to the present invention.
- FIG. 2 is a structure schematic view of the separation line separeated by the hole structure of the first embodiment according to the present invention.
- FIG. 3 is a structure schematic view of a second embodiment of a coupling inversion structure of a substrate waveguide filter according to the present invention.
- FIG. 4 is a structure schematic view of the separation line separeated by the hole structure of the second embodiment according to the present invention.
- Figs. 1-2 are structure schematic views of a first embodiment of a coupling inversion structure of a substrate waveguide filter according to the present invention.
- the coupling inversion structure of the substrate waveguide filter includes:
- a first resonator 1 having a substrate block of which the surface is covered a conduct layer, a substrate window 11 is disposed on the surface of the resonator 1 to expose the substrate of the resonator 1 for coupling between the resonator 1, wherein at least one hole structure for separating the substrate window are disposed in the substrate window 11, and the continuous separation line formed along the outer circumference of the hole structure in the substrate window 11 is used to separate the substrate window 11, and the length dimension of the separation line is set to exceed a half wavelength of the operating frequency of the substrate waveguide filter to reverse the coupling polarity of the resonator 1.
- the hole structure in this embodiment is a blind hole A.
- the hole structure may be provided as a through hole.
- the inner surface of the blind hole A is brushed with silver.
- the function of the blind hole A is to separate the substrate window 11 by a continuous separation line formed along the outer circumference of the blind hole A. Thus, when the length dimension of the separation line is set to exceed a half wavelength of the operating frequency of the substrate waveguide filter, the coupling polarity of the resonator 1 is reversed.
- the continuous separation line 2 formed along the outer circumference of the blind hole A includes at least: a first separation line 21 and a second separation line 22 extending from an end of the first separation line 21, when the range of the angle formed by the first separation line 21 and the second separation line 22 is (0, 90°] such that the separation line 2 is L-shaped or V-shaped.
- the substrate window 11 can be separated by the above-mentioned separation lines 21, 22.
- the separation lines 21, 22 are not covered with a conductive layer, and the substrate of the resonator is exposed, which can be used to perform energy coupling between the resonator 1 and other resonators.
- the substrate of the resonator 1 is a ceramic material, and the conductive layer covered on the resonator 1 is metallic silver. It can be understood that in other embodiments, other types of metal conductive layers may also be used.
- the resonator 1 has a cubic shape, which is based on the process, processing, and combination convenience. However, in specific implementations, the resonator 1 may be other common shapes, such as a cylindrical shape, a trapezoidal shape, or the like.
- the separation line 2 still includes a third separation line 23 extending from an end of the second separation line 22 and the third separation line 23 is parallel to the first separation line 21 so that the separation line 2 is U-shaped.
- FIG. 3 a second embodiment of a coupling inversion structure of a substrate waveguide filter provided by the present invention is shown.
- the couped inversion structure of the substrate waveguide filter in this embodiment is different from that of the first embodiment in that the hole structure in the substrate window 11 is set to two blind holes A1, A2, which are arranged up and down in the substrate window 11.
- the third separation line 23 is located between the two blind holes A1, A2, and the separation line 2 further includes a fourth separation line 24 extending from an end of the third separation line 23 and the fourth separation line 24 is parallel to the second separation line 22.
- the substrate window 11 can be separated by the above-described separation lines 21, 22, 23, 24.
- the separation lines 21, 22, 23, 24 are not covered with a conductive layer, and the substrate of the resonator is exposed, which can be used to perform energy coupling between the resonator 1 and other resonators.
- the separation lines are a first separation line 21, a second separation line 22, a third separation line 23, a fourth separation line 24, and patterns formed by connecting the first separation line 21, the second separation line 22, the third separation line 23 and the fourth separation line 24 in sequence with finite loops.
- the angle between the first separation line 21 and the second separation line 22 illustrated in the embodiment is 90°
- the angle between the second separation line 22 and the third separation line 23 is 90°, and so on, eventually forming an arcuate separation line pattern.
- the effect of this arrangement is that the plurality of separation lines connected in turn in form of arcuate-shape have an overall length of more than half a wavelength.
- the total length of the separation line refers to the sum of the lengths of the plurality of separation lines or the lengths of the separation lines confirmed according to the position of the center of gravity of the plurality of separation lines, which can reverse the coupling polarity between the two resonators and generate a negative coupling.
- the blind hole structure connected in sequence in the form of arcuate-shaped separation lines is simpler, and the welding assembly is not required, the assembly tolerances caused by welding is reduced, the production precision can be further improved, and the integrated production of the substrate filter can be performed.
- the amount and position and the like of the blind holes may be set according to actual needs.
- the disclosure of separating the substrate window 11 by the continuous separation lines formed along the outer circumference of the blind hole in the substrate window 11 is simpler in structure, and the coupling strength can be controlled by the size of the blind hole and the change of the position, and the productivity is high and the cost is low.
- the present invention also discloses a substrate waveguide filter having the above-described coupling inversion structure, and the specific embodiment thereof is the same as the embodiment of the coupling inversion structure of the above substrate waveguide filter, and details are omitted here.
- a substrate window is disposed on the resonator, and at least one hole structure for separating the substrate window are disposed in the substrate window, and the continuous separation line formed along the outer circumference of the hole structure in the substrate window is used to separate the substrate window, so as to reverse the coupling polarity of the resonator and generate a negative coupling.
- the production accuracy is improved, and the integrated production of the substrate filter can be performed.
Abstract
The present invention provide a coupling inversion structure of a substrate waveguide filter. The substrate window is provided with at least one hole structure for separating the substrate window, and a continuous separation line formed along the outer periphery of the hole structure in the substrate window is used to separate the substrate window, and the length dimension of the separation line is set to exceed a half wavelength of the operating frequency of the substrate waveguide filter to reverse the coupling polarity of the resonator. A substrate waveguide filter which includes the coupling inversion structure is also provided. Performing the present invention, the coupling polarity of the resonator can be reversed and a negative coupling is generated without welding, assembly tolerances caused by welding are reduced and the production accuracy is improved, so that the integrated production of the substrate filter can be performed.
Description
Embodiments of the present disclosure relate to RF filters, and more particularly to a substrate waveguide filter and a coupling inversion structure thereof.
With development of filters industry, miniaturization and lightweight gradually become a trend. Substrate waveguide can substantially reduce product size and has advantages of high Q value and low temperature-drift, so it is a good miniaturization solution.
The current substrate waveguide filter and cavity filter still have certain technical problems such as having a complicated structure of cross coupling (negative coupling), it is not flexible enough and it is difficult to implement.
For example: the current substrate waveguide filter generating cross coupling has the following three patterns:
The first solution is a metal probe structure which can generate negative cross coupling. In practice, the substrate is required to be punched and then the probe is inserted into the substrate. This solution has difficulty on assembling and fixation even though it can generate negative cross coupling.
The second solution is a structure with external microband lines which can generate negative cross coupling. In practice, at first it is required that the surface of the substrate block is brushed with silver to form microband lines and a probe is mounted which is connected with the substrate block resonator. However, this solution in one side increases components of product so that the assembly and fixation are both cumbersome and has low efficiency; in other side the intensity of cross coupling generated by the structure of this solution is too weak to be enhanced thereby increasing design difficulty.
The third solution is the coupling polarity inversion scheme of the window. The technical problem exists in that it is necessary to weld different substrate blocks together, which has certain difficulty in the process and is not conducive to control cost.
The object of the claimed invention is to provide a substrate waveguide filter and a coupling inversion structure thereof which can realize coupling polarity reversal without welding among resonators, and generate negative coupling and reduce the assembly tolerances caused by welding. The production precision is also improved and the integrated production of substrate filters can be performed.
To achieve above-mentioned object of the claimed invention, a coupling inversion structure of a substrate waveguide filter comprising:
a first resonator having a substrate block of which the surface is covered a conduct layer;
a substrate window is disposed on the surface of said resonator to expose the substrate of said resonator for coupling between said resonator and other resonators;
wherein at least one hole structure for separating said substrate window are disposed in said substrate window, and a continuous separation line formed along the outer circumference of said hole structure in said substrate window is used to separate said substrate window, and the length dimension of said separation line is set to exceed a half wavelength of the operating frequency of said substrate waveguide filter to reverse the coupling polarity of said resonator.
Advantageously, said hole structure is a blind hole or a through hole, and the inner surface of said blind hole or said through hole is brushed with silver.
Advantageously, said continuous separation line at least includes a first separation line and a second separation line extending from an end of said first separation line, and the degree range of the angle formed by said first separation line and said second separation line is (0, 90°].
Advantageously, said second separation line is connected with an end of said first separation line to make said separation line to appear a L-shape or V-shape.
Advantageously, said separation line includes a third separation line extending from an end of said second separation line and said third separation line is parallel to said first separation line to make said separation line to appear a U-shape.
Advantageously, said hole structure is set to two blind holes between which said third separation line is located, and said separation line further includes a fourth separation line extending from an end of said third separation line and said fourth separation line is parallel to said second separation line.
Advantageously, said separation lines are said first separation line, said second separation line, said third separation line, said fourth separation line, and a pattern formed by connecting said first separation line, said second separation line, said third separation line and said fourth separation line in sequence with finite loops.
Advantageously, said pattern is arcuate.
Advantageously, substrate of said resonator is a ceramic material, and said conductive layer covered on said resonator is metallic silver.
A substrate waveguide filter which includes the coupling inversion structure is also provided.
Performing the present invention will bring out the following beneficial effects:
Firstly, a substrate window is disposed on the resonator, and at least one hole structure for separating the substrate window are disposed in the substrate window, and the continuous separation line formed along the outer circumference of the hole structure in the substrate window is used to separate the substrate window, so as to reverse the coupling polarity of the resonator and generate a negative coupling..
Secondly, the structure is simplified, no welding is required, and assembly tolerances caused by welding are reduced.
Thirdly, the production accuracy is improved, and the integrated production of the substrate filter can be performed.
FIG. 1 is a structure schematic view of a first embodiment of a coupling inversion structure of a substrate waveguide filter according to the present invention.
FIG. 2 is a structure schematic view of the separation line separeated by the hole structure of the first embodiment according to the present invention.
FIG. 3 is a structure schematic view of a second embodiment of a coupling inversion structure of a substrate waveguide filter according to the present invention.
FIG. 4 is a structure schematic view of the separation line separeated by the hole structure of the second embodiment according to the present invention.
Embodiments of the invention will now be described more fully hereinafter with reference to the accompanying drawings, in which embodiments of the invention are shown.
Figs. 1-2 are structure schematic views of a first embodiment of a coupling inversion structure of a substrate waveguide filter according to the present invention. In this embodiment, the coupling inversion structure of the substrate waveguide filter includes:
a first resonator 1 having a substrate block of which the surface is covered a conduct layer, a substrate window 11 is disposed on the surface of the resonator 1 to expose the substrate of the resonator 1 for coupling between the resonator 1, wherein at least one hole structure for separating the substrate window are disposed in the substrate window 11, and the continuous separation line formed along the outer circumference of the hole structure in the substrate window 11 is used to separate the substrate window 11, and the length dimension of the separation line is set to exceed a half wavelength of the operating frequency of the substrate waveguide filter to reverse the coupling polarity of the resonator 1.
The hole structure in this embodiment is a blind hole A. In other embodiments, the hole structure may be provided as a through hole. The inner surface of the blind hole A is brushed with silver. The function of the blind hole A is to separate the substrate window 11 by a continuous separation line formed along the outer circumference of the blind hole A. Thus, when the length dimension of the separation line is set to exceed a half wavelength of the operating frequency of the substrate waveguide filter, the coupling polarity of the resonator 1 is reversed.
In this embodiment, the continuous separation line 2 formed along the outer circumference of the blind hole A includes at least: a first separation line 21 and a second separation line 22 extending from an end of the first separation line 21, when the range of the angle formed by the first separation line 21 and the second separation line 22 is (0, 90°] such that the separation line 2 is L-shaped or V-shaped.
In one embodiment, the substrate window 11 can be separated by the above-mentioned separation lines 21, 22. The separation lines 21, 22 are not covered with a conductive layer, and the substrate of the resonator is exposed, which can be used to perform energy coupling between the resonator 1 and other resonators.
The substrate of the resonator 1 is a ceramic material, and the conductive layer covered on the resonator 1 is metallic silver. It can be understood that in other embodiments, other types of metal conductive layers may also be used.
In the figure, the resonator 1 has a cubic shape, which is based on the process, processing, and combination convenience. However, in specific implementations, the resonator 1 may be other common shapes, such as a cylindrical shape, a trapezoidal shape, or the like.
Furthermore, the separation line 2 still includes a third separation line 23 extending from an end of the second separation line 22 and the third separation line 23 is parallel to the first separation line 21 so that the separation line 2 is U-shaped.
Referring to Fig. 3 to Fig. 4, a second embodiment of a coupling inversion structure of a substrate waveguide filter provided by the present invention is shown.
The couped inversion structure of the substrate waveguide filter in this embodiment is different from that of the first embodiment in that the hole structure in the substrate window 11 is set to two blind holes A1, A2, which are arranged up and down in the substrate window 11. The third separation line 23 is located between the two blind holes A1, A2, and the separation line 2 further includes a fourth separation line 24 extending from an end of the third separation line 23 and the fourth separation line 24 is parallel to the second separation line 22. The substrate window 11 can be separated by the above-described separation lines 21, 22, 23, 24. In one embodiment, the separation lines 21, 22, 23, 24 are not covered with a conductive layer, and the substrate of the resonator is exposed, which can be used to perform energy coupling between the resonator 1 and other resonators.
In other embodiments of the coupling inversion structure of the substrate waveguide filter of the present invention, the separation lines are a first separation line 21, a second separation line 22, a third separation line 23, a fourth separation line 24, and patterns formed by connecting the first separation line 21, the second separation line 22, the third separation line 23 and the fourth separation line 24 in sequence with finite loops.
Specifically, the angle between the first separation line 21 and the second separation line 22 illustrated in the embodiment is 90°, and the angle between the second separation line 22 and the third separation line 23 is 90°, and so on, eventually forming an arcuate separation line pattern.
The effect of this arrangement is that the plurality of separation lines connected in turn in form of arcuate-shape have an overall length of more than half a wavelength. The total length of the separation line refers to the sum of the lengths of the plurality of separation lines or the lengths of the separation lines confirmed according to the position of the center of gravity of the plurality of separation lines, which can reverse the coupling polarity between the two resonators and generate a negative coupling.
In this embodiment, compared to traditional serpentine windows, the blind hole structure connected in sequence in the form of arcuate-shaped separation lines is simpler, and the welding assembly is not required, the assembly tolerances caused by welding is reduced, the production precision can be further improved, and the integrated production of the substrate filter can be performed. In other embodiments, the amount and position and the like of the blind holes may be set according to actual needs.
In summary, by providing a blind hole in the substrate window 11, the disclosure of separating the substrate window 11 by the continuous separation lines formed along the outer circumference of the blind hole in the substrate window 11 is simpler in structure, and the coupling strength can be controlled by the size of the blind hole and the change of the position, and the productivity is high and the cost is low.
The present invention also discloses a substrate waveguide filter having the above-described coupling inversion structure, and the specific embodiment thereof is the same as the embodiment of the coupling inversion structure of the above substrate waveguide filter, and details are omitted here.
Performing the present invention will bring out the following beneficial effects:
Firstly, a substrate window is disposed on the resonator, and at least one hole structure for separating the substrate window are disposed in the substrate window, and the continuous separation line formed along the outer circumference of the hole structure in the substrate window is used to separate the substrate window, so as to reverse the coupling polarity of the resonator and generate a negative coupling.
Secondly, the structure is simplified, no welding is required, and assembly tolerances caused by welding are reduced.
Thirdly, the production accuracy is improved, and the integrated production of the substrate filter can be performed.
It is believed that the present embodiments and their advantages will be understood from the foregoing description, and it will be apparent that various changes may be made thereto without departing from the spirit and scope of the invention or sacrificing all of its material advantages, the examples hereinbefore described merely being preferred or exemplary embodiments of the invention.
Claims (10)
- A coupling inversion structure of a substrate waveguide filter comprising:a first resonator having a substrate block of which the surface is covered a conduct layer;a substrate window is disposed on the surface of said resonator to expose the substrate of said resonator for coupling between said resonator and other resonators;wherein at least one hole structure for separating said substrate window are disposed in said substrate window, and a continuous separation line formed along the outer circumference of said hole structure in said substrate window is used to separate said substrate window, and the length dimension of said separation line is set to exceed a half wavelength of the operating frequency of said substrate waveguide filter to reverse the coupling polarity of said resonator.
- The coupling inversion structure of the substrate waveguide filter as claimed in claim 1, wherein said hole structure is a blind hole or a through hole, and the inner surface of said blind hole or said through hole is brushed with silver.
- The coupling inversion structure of the substrate waveguide filter as claimed in claim 2, wherein said continuous separation line at least includes a first separation line and a second separation line extending from an end of said first separation line, and the degree range of the angle formed by said first separation line and said second separation line is (0, 90°].
- The coupling inversion structure of the substrate waveguide filter as claimed in claim 3, said second separation line is connected with an end of said first separation line to make said separation line to appear a L-shape or V-shape.
- The coupling inversion structure of the substrate waveguide filter as claimed in claim 3, wherein said separation line includes a third separation line extending from an end of said second separation line and said third separation line is parallel to said first separation line to make said separation line to appear a U-shape.
- The coupling inversion structure of the substrate waveguide filter as claimed in claim 5, wherein said hole structure is set to two blind holes between which said third separation line is located, and said separation line further includes a fourth separation line extending from an end of said third separation line and said fourth separation line is parallel to said second separation line.
- The coupling inversion structure of the substrate waveguide filter as claimed in claim 6, wherein said separation lines are said first separation line, said second separation line, said third separation line, said fourth separation line, and a pattern formed by connecting said first separation line, said second separation line, said third separation line and said fourth separation line in sequence with finite loops.
- The coupling inversion structure of the substrate waveguide filter as claimed in claim 7, wherein said pattern is arcuate.
- The coupling inversion structure of the substrate waveguide filter as claimed in claim 1, wherein the substrate of said resonator is a ceramic material, and said conductive layer covered on said resonator is metallic silver.
- A substrate waveguide filter comprising the coupling inversion structure according to any one of claims 1-9.
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| Application Number | Priority Date | Filing Date | Title |
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| PCT/KR2019/001964 WO2020171247A1 (en) | 2019-02-19 | 2019-02-19 | A substrate waveguide filter and a coupling inversion structure thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| PCT/KR2019/001964 WO2020171247A1 (en) | 2019-02-19 | 2019-02-19 | A substrate waveguide filter and a coupling inversion structure thereof |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105244571A (en) * | 2015-09-17 | 2016-01-13 | 深圳三星通信技术研究有限公司 | Dielectric waveguide filter |
| CN106299558A (en) * | 2016-08-24 | 2017-01-04 | 张家港保税区灿勤科技有限公司 | high reliability dielectric waveguide filter |
| CN106898849A (en) * | 2017-04-25 | 2017-06-27 | 四川省韬光通信有限公司 | A kind of dielectric waveguide filter with cross coupling structure |
| CN107069155A (en) * | 2017-01-12 | 2017-08-18 | 深圳三星通信技术研究有限公司 | A kind of dielectric waveguide filter and its coupling inversion structures |
| KR20180010192A (en) * | 2015-05-22 | 2018-01-30 | 시티에스 코포레이션 | Dielectric waveguide filter with direct coupling and alternating cross coupling |
-
2019
- 2019-02-19 WO PCT/KR2019/001964 patent/WO2020171247A1/en active Application Filing
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20180010192A (en) * | 2015-05-22 | 2018-01-30 | 시티에스 코포레이션 | Dielectric waveguide filter with direct coupling and alternating cross coupling |
| CN105244571A (en) * | 2015-09-17 | 2016-01-13 | 深圳三星通信技术研究有限公司 | Dielectric waveguide filter |
| CN106299558A (en) * | 2016-08-24 | 2017-01-04 | 张家港保税区灿勤科技有限公司 | high reliability dielectric waveguide filter |
| CN107069155A (en) * | 2017-01-12 | 2017-08-18 | 深圳三星通信技术研究有限公司 | A kind of dielectric waveguide filter and its coupling inversion structures |
| CN106898849A (en) * | 2017-04-25 | 2017-06-27 | 四川省韬光通信有限公司 | A kind of dielectric waveguide filter with cross coupling structure |
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