CN110323576B - Phased array antenna structure - Google Patents
Phased array antenna structure Download PDFInfo
- Publication number
- CN110323576B CN110323576B CN201910620118.7A CN201910620118A CN110323576B CN 110323576 B CN110323576 B CN 110323576B CN 201910620118 A CN201910620118 A CN 201910620118A CN 110323576 B CN110323576 B CN 110323576B
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- phase
- antenna
- antenna structure
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- phased array
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- 230000005855 radiation Effects 0.000 claims abstract description 39
- 230000005540 biological transmission Effects 0.000 claims abstract description 25
- 238000010586 diagram Methods 0.000 description 7
- 238000013461 design Methods 0.000 description 5
- 230000007547 defect Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000008054 signal transmission Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/0006—Particular feeding systems
- H01Q21/0075—Stripline fed arrays
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/06—Arrays of individually energised antenna units similarly polarised and spaced apart
- H01Q21/061—Two dimensional planar arrays
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/29—Combinations of different interacting antenna units for giving a desired directional characteristic
- H01Q21/293—Combinations of different interacting antenna units for giving a desired directional characteristic one unit or more being an array of identical aerial elements
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
- H01Q3/26—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture
- H01Q3/30—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture varying the relative phase between the radiating elements of an array
Landscapes
- Variable-Direction Aerials And Aerial Arrays (AREA)
Abstract
The application discloses a phase array antenna structure, which comprises a carrier, an antenna layer, a circuit layer and a phase switcher, wherein the antenna layer and the circuit layer are arranged on the carrier. The antenna layer comprises two radiation parts, the circuit layer comprises a phase antenna and a transmission circuit, the phase antenna comprises two end parts, and the two end parts are respectively connected with the two radiation parts. The transmission line comprises a feed-in end and an external end, and the external end is adjacently arranged on the phase antenna. The phase switch is connected to the external connection terminal of the transmission line, and the phase switch is selectively connectable to one of the two end portions of the phase antenna.
Description
Technical Field
The present disclosure relates to antenna structures, and particularly to a phased array antenna structure.
Background
Under the requirement that the existing antenna structure can generate various antenna patterns, a phase shifter (phase shifter) with high price is adopted in most cases; in the field of antennas, the conventional antenna structure can only generate various antenna patterns through the phase shifter, so that a given impression is formed, and research in the field of antennas has omitted improvement of the wire antenna structure.
Accordingly, the applicant considered that the above-mentioned defects can be improved, and has intensively studied and combined with the application of scientific principles, and finally proposed the present application which is reasonable in design and effectively improves the above-mentioned defects.
Disclosure of Invention
The embodiment of the application provides a phased array antenna structure, which can effectively improve the defects possibly generated by the existing antenna structure.
The embodiment of the application discloses a phased array antenna structure, includes: a carrier; the radiation layer comprises N radiation parts and is arranged on the carrier, and N is a positive integer greater than 1; the circuit layer is arranged on the carrier and comprises: n groups of phase antenna units which correspond to the N radiation parts in position respectively, wherein each group of phase antenna units comprises a plurality of phase antennas which are arranged at intervals and have different lengths; the transmission line comprises a feed-in end and N external ends, and the N external ends are respectively and adjacently arranged on N groups of phase antenna units; and N phase switching units (phase switching unit) which correspond to the N groups of phase antenna units respectively in position; the N phase switching units are respectively connected with N external terminals of the transmission line and N radiation parts; the phase switching units can be selectively connected to one of the phase antennas of the plurality of phase antennas in each group of the phase antenna units and the corresponding phase switching units, so that the phase array antenna structure can generate at least 2N antenna patterns.
The embodiment of the application also discloses a phased array antenna structure, which comprises: a carrier; the radiation layer comprises two radiation parts and is arranged on the carrier; the circuit layer is arranged on the carrier and comprises: a phase antenna comprising two end parts, wherein the two end parts are respectively connected with the two radiation parts; the transmission line comprises a feed-in end and an external end, and the external end is adjacently arranged on the phase antenna; and a phase switch connected to the external terminal of the transmission line, and selectively connectable to one of the two ends of the phase antenna.
In summary, the phase array antenna structure disclosed in the embodiments of the present application can be more effectively matched with the phase switching unit (or phase switcher) through the structural design and matching of the radiation layer and the circuit layer, so as to replace the phase shifter with at least ten times of the existing antenna structure.
For a further understanding of the features and technical content of the present application, reference should be made to the following detailed description of the application and the accompanying drawings, which are included to illustrate the application and not to limit the scope of the application in any way.
Drawings
In order to more clearly illustrate the embodiments of the present description or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some of the embodiments described in the present description, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic perspective view of a phased array antenna structure according to a first embodiment of the present invention.
Fig. 2 is a schematic top view of fig. 1.
Fig. 3 is a schematic top view of fig. 1 with the phase switching unit omitted.
Fig. 4 is a schematic top view illustrating a first operation mode of the phased array antenna structure according to the first embodiment of the present invention.
Fig. 5 is a schematic diagram of the antenna pattern of fig. 4.
Fig. 6 is a schematic top view illustrating a first operation mode of the phased array antenna structure according to the second embodiment of the present invention.
Fig. 7 is a schematic diagram of the antenna pattern of fig. 6.
Fig. 8 is a schematic top view illustrating a third operation mode of the phased array antenna structure according to the first embodiment of the present invention.
Fig. 9 is a schematic diagram of the antenna pattern of fig. 8.
Fig. 10 is a schematic top view illustrating a fourth operation mode of the phased array antenna structure according to the first embodiment of the present invention.
Fig. 11 is a schematic diagram of the antenna pattern of fig. 10.
Fig. 12 is a schematic plan view of a phased array antenna structure according to a second embodiment of the invention.
Fig. 13 is a schematic diagram of fig. 1 with the phase shifter omitted.
Fig. 14 is a schematic diagram of an antenna pattern of a first operation mode of the phased array antenna structure according to the second embodiment of the present invention.
Fig. 15 is a schematic diagram of an antenna pattern of a second operation mode of the phased array antenna structure according to the second embodiment of the present invention.
Reference numerals of the above drawings:
100: phased array antenna structure
1: carrier body
11: first panel
12: second panel
13: conductive column
2: radiation layer
21: radiation part
3: circuit layer
31: phase antenna unit
311: phase antenna
3111: end portion
32: transmission line
321: feed-in circuit
3211: feed-in terminal
3212: connecting terminal
322: branch line
3221: external connection terminal
40: phase switching unit
4. 4a: phase switcher
P: antenna field type
L: cross line
Detailed Description
Referring to fig. 1 to 15, which are examples of the present application, it should be noted that the number and shape of the present embodiment corresponding to the related figures are only used for specifically describing the embodiments of the present application, so as to facilitate understanding of the content of the present application, and are not used to limit the protection scope of the present application.
Example one
Referring to fig. 1 to 11, which are a first embodiment of the present application and are shown in X-axis, Y-axis and Z-axis for convenience of explanation of the present embodiment. As shown in fig. 1 to 3, the present embodiment discloses a phased array antenna structure 100, which can be applied to a transmission band, and a center frequency of the transmission band corresponds to a wavelength. The phased array antenna structure 100 includes a carrier 1, a radiation layer 2 and a circuit layer 3 disposed on the carrier 1, and N phase switching units 40 disposed on the carrier 1 and corresponding to the circuit layer 3.
Further, N is a positive integer greater than 1, and in the drawings of the present embodiment, N is illustrated with 4, but the present invention is not limited thereto. For example, in other embodiments not shown in the present disclosure, N may be 2, 3, or 5 or more. In addition, other components (such as a ground layer) may be disposed on the carrier 1 in the phased array antenna structure 100, but this embodiment is not described in detail.
As shown in fig. 1 to 3, the carrier 1 has a plate shape in the present embodiment and includes a first plate surface 11 and a second plate surface 12 located at opposite sides, and the radiation layer 2 is disposed on the first plate surface 11 of the carrier 1, and the circuit layer 3 and the N phase switching units 40 are disposed on the second plate surface 12 of the carrier 1, but the invention is not limited thereto. For example, in other embodiments of the present invention not shown, the radiation layer 2 and at least one of the circuit layer 3 and the N phase switching units 40 may be disposed on the same surface of the carrier 1.
The radiation layer 2 includes N radiation portions 21, and the N radiation portions 21 are formed in the first plate surface 11 of the carrier 1 in a matrix shape with substantially the same shape (e.g., square shape) in the present embodiment. The circuit layer 3 includes N groups of phase antenna units 31 corresponding to the N radiation portions 21 and a transmission circuit 32 corresponding to the N groups of phase antenna units 31.
Further, each group of phase antenna units 31 includes a plurality of phase antennas 311 with different lengths and arranged at intervals. In this embodiment, a plurality of conductive posts (not shown) are embedded in the carrier 1, so that each phase antenna 311 can be connected to the corresponding radiation portion 21 through the conductive posts and electrically coupled to each other.
Furthermore, the length of the plurality of phase antennas 311 of each group of phase antenna units 31 is a multiple of 1/4 of the wavelength in the present embodiment; that is, the lengths of the three phase antennas 311 of each group of phase antenna units 31 in fig. 3 are respectively 1/4 of the wavelength, 2/4 of the wavelength, and 3/4 of the wavelength, but the invention is not limited thereto. In each of the phase antenna units 31, at least one of the phase antennas 311 has a U-shaped portion, and the U-shaped portion may be regarded as a C-shape.
In addition, in each group of phase antenna units 31 and the corresponding radiation portion 21, the radiation portion 21 is projected towards the second surface 12 of the carrier 1 to form a projection area, which covers at least part of the phase antenna units 31, and each phase antenna 311 of the phase antenna units 31 is at least partially covered by the projection area.
As shown in fig. 1 to 3, the transmission line 32 includes a feeding line 321 and a branch line 322 connected to the feeding line 321. The feeding line 321 is substantially linear in the present embodiment and has a feeding end 3211 and a connecting end 3212 located at opposite sides, the feeding end 3211 is located at an edge of the carrier 1, and the feeding line 321 extends from the feeding end 3211 to the connecting end 3212 (or the branch line 322) through two adjacent phase antenna units 31. The feed-in terminal 3211 can be used for connecting and fixing to a connector (not shown) for signal transmission between the phased array antenna structure 100 and an external device.
The branch line 322 is substantially H-shaped in the present embodiment and has N external terminals 3221, and the N external terminals 3221 are respectively and adjacently disposed on the N groups of phase antenna units 31; that is, the end of the branch line 322 is the external connection end 3221, and each external connection end 3221 is spaced from the corresponding group of phase antenna units 31.
Furthermore, the connection end 3212 of the feed-in line 321 is connected to the branch line 322, and the N external connection ends 3221 may define a plurality of intersecting lines L intersecting each other, and the connection end 3212 is located at a point of intersection of the intersecting lines L. In this embodiment, the paths from the connection end 3212 to each external connection end 3221 along the branch line 322 are the same; that is, the connection end 3212 of the feeding line 321 is connected to the center point of the branch line 322, so as to facilitate synchronous transmission of signals, but the invention is not limited thereto.
In another aspect, two sets of phase antenna elements 31 (e.g., two sets of phase antenna elements 31 on the right in fig. 3) adjacent to the feed-in end 3211 are rotationally symmetrical (2-fold rotational symmetry) with respect to the connection end 3212 by 180 degrees with respect to the other two sets of phase antenna elements 31 (e.g., two sets of phase antenna elements 31 on the left in fig. 3).
The N phase switching units 40 correspond to the N groups of phase antenna units 31, and each phase switching unit in the embodiment is disposed adjacent to the corresponding group of phase antenna units 31. The N phase switching units 40 are respectively connected to N external terminals 3221 of the transmission line 32, and the N phase switching units 40 are also respectively connected to N radiation portions 21. In the present embodiment, each phase switching unit 40 includes two phase switches 4, and one phase switch 4 of the phase switching units 40 is connected to the corresponding external terminal 3221, and the other phase switch 4a is connected to the corresponding radiation portion 21 through the conductive post 13 embedded in the carrier 11, but the invention is not limited thereto. For example, in other embodiments of the invention not shown, the phase switch 4 may be indirectly connected to the corresponding external terminal 3221 or the radiating portion 21 through a wire; alternatively, the phase switching unit 40 may be a single phase switch.
Furthermore, in each group of phase antenna units 31 and the corresponding phase switching unit 40, the phase switching unit 40 can be selectively connected to one of the phase antennas 311 of the plurality of phase antennas 311, so that the phase array antenna structure 100 can generate at least 2N antenna patterns P. That is, the two phase switches 4, 4a corresponding to the above may be simultaneously connected to the same one phase antenna 311. In addition, each of the phase switching units 40 may be connected to the phase antennas 311 with the same length (e.g., fig. 4 and 5), or each of the phase switching units 40 may be connected to the phase antennas 311 with different lengths (e.g., fig. 6 to 11), so as to generate the specific antenna pattern P required by the user. Accordingly, in the case where N is 4 in the present embodiment, the phased array antenna structure 100 is capable of generating 9 antenna patterns P (only 4 antenna patterns P are shown in the drawing).
As described above, the phased array antenna structure 100 in the present embodiment can be more effectively matched with the phase switching unit 40 by the structural design and matching of the radiation layer 2 and the circuit layer 3, thereby replacing the phase shifter with at least ten times of the existing antenna structure.
Example two
Please refer to fig. 12 to 15, which are a second embodiment of the present application, and the second embodiment is similar to the first embodiment, so the same parts of the two embodiments will not be described again, and the differences between the second embodiment and the first embodiment are generally described as follows:
as shown in fig. 12 and 13, the present embodiment discloses a phased array antenna structure 100, which can be applied to a transmission band, and a center frequency of the transmission band corresponds to a wavelength. The phased array antenna structure 100 includes a carrier 1, a radiation layer 2 and a circuit layer 3 disposed on the carrier 1, and a phase switch 4 disposed on the carrier 1 and corresponding to the circuit layer 3. The structure of the carrier 1 in this embodiment is the same as that of the first embodiment, and will not be described in detail here.
The radiation layer 2 includes two radiation portions 21, and the two radiation portions 21 have substantially the same shape (e.g., partially spiral shape) and are formed on the first plate surface 11 of the carrier 1. The circuit layer 3 is formed on the first board 11 of the carrier 1, and includes a phase antenna 311 connected to the two radiation portions 21 and a transmission circuit 32 disposed adjacent to the phase antenna 311.
Further, the phase antenna 311 includes two ends 3111, and the two ends 3111 of the phase antenna 311 are connected to the two radiating portions 21, respectively. The length of the phase antenna 311 may be a multiple of 1/4 of the wavelength, and the length of the phase antenna 311 is 1/4 of the wavelength in the present embodiment, but the present invention is not limited thereto. Furthermore, the phase antenna 311 is located between the two radiating portions 21 in the present embodiment, but in other embodiments not shown in the present invention, the phase antenna 311 may be located on the left or right side of the transmission line 32.
The transmission line 32 is substantially linear in the present embodiment and has a feeding end 3211 and an external end 3221 located at opposite sides, the feeding end 3211 is located at an edge of the carrier 1, and the feeding line 321 extends from the feeding end 3211 toward the phase antenna 311 to the external end 3221; the external connection end 3221 is adjacently disposed on the phase antenna 311, that is, the external connection end 3221 is disposed at a distance from the phase antenna 311. It should be noted that, in the present embodiment, the phase antenna 311 and the radiation layer 2 are configured as a single piece and integrally connected, and the phase array antenna structure 100 may be configured as mirror symmetry with respect to the transmission line 32, so as to facilitate design and production and manufacture, but the invention is not limited thereto.
The phase switch 4 is connected (directly or indirectly) to the external connection end 3221 of the transmission line 32, and the phase switch 4 can be selectively connected to one of the two ends 3111 of the phase antenna 311, so that the phase array antenna structure 100 can generate 2 antenna patterns P (e.g. fig. 14 and 15). Further, one of the two radiating portions 21 and the phase antenna 311 together form an antenna pattern P, which forms a phase difference of 90 degrees with the antenna pattern P formed by the other radiating portion 21 (see fig. 14 and 15).
[ technical Effect of embodiments of the present application ]
In summary, the phase array antenna structure disclosed in the embodiments of the present application can be more effectively matched with the phase switching unit (or phase switcher) through the structural design and matching of the radiation layer and the circuit layer, so as to replace the phase shifter with at least ten times of the existing antenna structure.
The foregoing disclosure is only a preferred embodiment of the present application and is not intended to limit the scope of the claims, and all equivalent technical changes made by the application of the specification and drawings are included in the scope of the present application.
Claims (6)
1. A phased array antenna structure comprising:
a carrier;
the radiation layer comprises N radiation parts and is arranged on the carrier, and N is a positive integer greater than 1;
the circuit layer is arranged on the carrier and comprises:
n groups of phase antenna units respectively corresponding to the N radiation parts, wherein each group of phase antenna units comprises a plurality of phase antennas which are arranged at intervals and have different lengths; and
The transmission line comprises a feed-in end and N external ends, and the N external ends are respectively and adjacently arranged on N groups of phase antenna units; and
n phase switching units respectively corresponding to the N groups of phase antenna unit positions; the N phase switching units are respectively connected with N external terminals of the transmission line and N radiation parts;
wherein, in each group of the phase antenna units and the corresponding phase switching units, the phase switching units can be selectively connected with one of the phase antennas of a plurality of phase antennas, so that the phase array antenna structure can generate at least 2N antenna patterns,
wherein, the transmission line includes:
a feed-in line having the feed-in end and a connection end at opposite sides, wherein the feed-in end is located at the edge of the carrier; and
The branch circuit is provided with N external terminals, the connecting terminals of the feed-in circuit are connected to the branch circuit, and the paths from the connecting terminals to each external terminal along the branch circuit are the same.
2. The phased array antenna structure of claim 1, wherein N of the external terminals define a plurality of intersecting lines intersecting each other, and the connection terminal is located at an intersection of the plurality of intersecting lines.
3. The phased array antenna structure of claim 1, wherein N is 4, and two groups of the phased antenna units adjacent to the feed end are rotationally symmetric by 180 degrees with respect to the connection end and the other two groups of phased antenna units.
4. The phased array antenna structure of claim 1, wherein said phased array antenna structure is adapted for a transmission band and a center frequency of said transmission band corresponds to a wavelength, and said lengths of a plurality of said phase antennas of each set of said phase antenna elements are multiples of 1/4 of said wavelength.
5. The phased array antenna structure of claim 1, wherein at least one of the plurality of phase antennas has a U-shaped portion in each of the sets of phase antenna elements.
6. The phased array antenna structure according to claim 1, wherein the carrier is plate-shaped and comprises a first plate surface and a second plate surface located at opposite sides, the radiation layer is disposed on the first plate surface, and the circuit layer and the N phase switching units are disposed on the second plate surface; in each group of the phase antenna units and the corresponding radiation part, a projection area formed by orthographic projection of the radiation part towards the second plate surface covers at least part of the phase antenna units.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW108204750 | 2019-04-18 | ||
| TW108204750U TWM586465U (en) | 2019-04-18 | 2019-04-18 | Phase array antenna structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110323576A CN110323576A (en) | 2019-10-11 |
| CN110323576B true CN110323576B (en) | 2024-03-22 |
Family
ID=68121805
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921072692.5U Withdrawn - After Issue CN210926350U (en) | 2019-04-18 | 2019-07-10 | Phase array antenna structure |
| CN201910620118.7A Active CN110323576B (en) | 2019-04-18 | 2019-07-10 | Phased array antenna structure |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921072692.5U Withdrawn - After Issue CN210926350U (en) | 2019-04-18 | 2019-07-10 | Phase array antenna structure |
Country Status (2)
| Country | Link |
|---|---|
| CN (2) | CN210926350U (en) |
| TW (1) | TWM586465U (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWM586465U (en) * | 2019-04-18 | 2019-11-11 | 耀登科技股份有限公司 | Phase array antenna structure |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201392882Y (en) * | 2009-03-25 | 2010-01-27 | 智捷科技股份有限公司 | Dual-frequency antenna |
| CN108346850A (en) * | 2017-01-23 | 2018-07-31 | 启碁科技股份有限公司 | Antenna system |
| CN210926350U (en) * | 2019-04-18 | 2020-07-03 | 耀登电通科技（昆山）有限公司 | Phase array antenna structure |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8081123B2 (en) * | 2006-10-02 | 2011-12-20 | Airgain, Inc. | Compact multi-element antenna with phase shift |
| US9548543B2 (en) * | 2015-01-07 | 2017-01-17 | Omega Optics, Inc. | Method for fabricating and packaging an M×N phased-array antenna |
-
2019
- 2019-04-18 TW TW108204750U patent/TWM586465U/en unknown
- 2019-07-10 CN CN201921072692.5U patent/CN210926350U/en not_active Withdrawn - After Issue
- 2019-07-10 CN CN201910620118.7A patent/CN110323576B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201392882Y (en) * | 2009-03-25 | 2010-01-27 | 智捷科技股份有限公司 | Dual-frequency antenna |
| CN108346850A (en) * | 2017-01-23 | 2018-07-31 | 启碁科技股份有限公司 | Antenna system |
| CN210926350U (en) * | 2019-04-18 | 2020-07-03 | 耀登电通科技（昆山）有限公司 | Phase array antenna structure |
Also Published As
| Publication number | Publication date |
|---|---|
| CN210926350U (en) | 2020-07-03 |
| TWM586465U (en) | 2019-11-11 |
| CN110323576A (en) | 2019-10-11 |
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