CN106159465B - Five beam array antenna of wideband - Google Patents
Five beam array antenna of wideband Download PDFInfo
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- CN106159465B CN106159465B CN201610803078.6A CN201610803078A CN106159465B CN 106159465 B CN106159465 B CN 106159465B CN 201610803078 A CN201610803078 A CN 201610803078A CN 106159465 B CN106159465 B CN 106159465B
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- power divider
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- wideband
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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
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q19/00—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic
- H01Q19/10—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/24—Combinations of antenna units polarised in different directions for transmitting or receiving circularly and elliptically polarised waves or waves linearly polarised in any direction
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q23/00—Antennas with active circuits or circuit elements integrated within them or attached to them
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- Variable-Direction Aerials And Aerial Arrays (AREA)
Abstract
The invention discloses a kind of five beam array antennas of wideband comprising a metallic reflection plate；One radiation cell array, it includes M subarray, each subarray includes N number of radiating element arranged in the horizontal direction, at least one subarray deviates in the horizontal direction；Multiple phase compensating circuits carry out phase compensation to the subarray of horizontal direction offset；Multiple beam-forming networks, it includes 23 × 3 butler matrix circuitries, multiple 2 roads blender circuit, phase shifter circuit and power distributing network, beam-forming network, first input port comprising forming the first wave beam, form the second input port of the second wave beam, form the third input port of third wave beam, form the 4th input port of the 4th wave beam, with the 5th input port for forming the 5th wave beam, it is deviated in the horizontal direction according to certain rule using the radiating element that do not go together in this way, and certain phase compensation is added to the radiating element of offset to inhibit graing lobe in feeding network.
Description
[technical field]
The present invention relates to a kind of five beam array antenna of wideband, espespecially a kind of five wave of wideband for improving network rate and capacity
Beam array antenna.
[background technique]
After fourth generation mobile communication technology 4G/LTE scale is commercial, the data traffic in mobile communications network is increased sharply, user
Close quarters mobile communication system bandwidth capacity faces immense pressure.Large-scale square, transport hub, sports center, performing art venue,
The zone users such as tourist attractions, College Dormitory are intensive, and peak time can be gathered tens of thousands of or even more than 100,000 populations, data flow
Amount and voice communication require system and have high capacity.In order to increase communication network capacity, tradition increases the mode of carrier wave
Promoted limited, another reduces antenna for base station overlay area to increase the method for base station number, faces the siting of station and object
The problem that industry is coordinated, with high costs, capacity improves limited.
For the problem that single subdistrict capacity is limited, using multibeam antenna, the overlay area of conventional single sector can be thin
It is divided into multiple sectors, radio channel capacity is multiplied.The patent of invention of 102570057 A of Publication No. CN proposes one kind
The method that five wave beams are generated using 6 × 6 butler matrixs, as shown in Figure 1.Each column of evenly arranged radiating element and hang down
Straight power splitter is connected, then is connected with 6 × 6 butler matrix delivery outlet, each corresponding 6 × 6 butler matrix that polarize.
But the technical work bandwidth only has 23.7% (1710-2170MHz), cannot be compatible with the 2300 and 2600MHz of 4G LTE simultaneously
Frequency range.Existing five beam technique can generate very if frequency range is widened to 1700-2700MHz frequency range in 2700MHz frequency
High horizontal graing lobe.The directional diagram of Fig. 2 simulation calculation shows that graing lobe is up to -5dB at 2700MHz frequency, to neighbor cell interference
It is very big.
Therefore, it is necessary to design a kind of good five beam array antenna of wideband, working band is widened to 1700-2700MHz,
The frequency range of compatible 4G, 3G standard frequency range and part 2G standard, and working band range inner orientation angular direction has good secondary lobe
With grating lobe suppression performance, to overcome the above problem.
[summary of the invention]
For background technique problem encountered, the purpose of the present invention is to provide one kind to pass through setting phase compensating circuit
Phase compensation is being carried out to the subarray of horizontal direction offset, is improving the five beam array antenna of wideband of network rate and capacity.
To achieve the above object, the present invention uses following technological means:
A kind of five beam array antenna of wideband a comprising metallic reflection plate；One radiation cell array, it includes M sons
Array, each subarray include N number of radiating element arranged in the horizontal direction, at least one subarray is inclined in the horizontal direction
It moves；Multiple phase compensating circuits carry out phase compensation to the subarray of horizontal direction offset；Multiple beam-forming networks, packet
Containing 23 × 3 butler matrix circuitries, multiple 2 roads blender circuit, phase shifter circuit and power distributing network, Wave beam forming net
Network, the first input port comprising forming the first wave beam, forms the second input port of the second wave beam, forms the of third wave beam
Three input ports form the 4th input port of the 4th wave beam, and form the 5th input port of the 5th wave beam.
Further, radiating element is dual polarized antenna unit.
Further, the number M of subarray is 6, and the number N of radiating element is 10 in each subarray.
Further, multiple radiating elements of each subarray are arranged along a horizontal line, and 3 subarrays are in the horizontal direction
Offset.
Further, the horizontal space of each subarray radiating element is equal, and the vertical interval between each subarray is equal.
Further, the distance that subarray deviates in the horizontal direction is the half of radiating element horizontal space.
Further, phase compensating circuit includes 2 individual transmission routes, and the two phase difference is φ.
Further, the input port of 3 × 3 butler matrix circuitries connects 2 road blender circuits by phase shifter circuit
Output port, the input port of the output port connection power distributing network of 3 × 3 butler matrix circuitries, No. 2 mixers electricity
The input port on road is the first input port of beam-forming network, the second input port, third input port, the 4th input terminal
Mouth and the 5th input port, the output port of power distributing network are the output port of beam-forming network.
Further, 3 × 3 butler matrix circuitries are made of three mixers and at least one phase shifter.
Further, the azimuth coverage of the first wave beam is 30 to 55 degree, and the azimuth coverage of the second wave beam is 15 to 23
Degree, the azimuth of third wave beam are 0 degree, and the azimuth coverage of the 4th wave beam is -15 to -23 degree, the azimuth model of the 5th wave beam
It encloses for -30 to -55 degree.
Further, the first power divider network includes multiple 3 tunnels power divider circuit, and the second power divider network includes multiple 2
Road power divider circuit.
Further, the output port of 3 tunnel power divider circuits connects three spokes positioned at the same horizontal position that do not go together
Penetrate unit, the output port of the input port connection beam-forming network of 3 tunnel power divider circuits.
Further, the first input port of beam-forming network, the second input port, the 4th input port and the 5th are defeated
Inbound port connects the second power divider network by phase compensating circuit.
Further, the first input port of beam-forming network and the 5th input port, corresponding phase compensation circuit
Phase difference is equal；The second input port and the 4th input port of beam-forming network, the phase difference of corresponding phase compensation circuit
It is equal.
Compared with prior art, the invention has the following advantages:
Above-mentioned five beam array antenna of wideband, each subarray include N number of radiating element arranged in the horizontal direction, until
A few subarray deviates in the horizontal direction, multiple phase compensating circuits, carries out phase benefit to the subarray of horizontal direction offset
It repays, the arrangement scheme deviated in the horizontal direction according to certain rule using the radiating element that do not go together in this way, and in feeding network
In add certain phase compensation to the radiating element of offset, five beam antennas all have in ultratvide frequency band preferable secondary lobe and
Grating lobe suppression performance reduces the adjacent area interference of wave beam respective cell, real under conditions of not increasing antenna site and terrace resource
The channeling of existing neighboring community, improves network capacity.
[Detailed description of the invention]
Fig. 1 is the radiating element arrangement scheme that the prior art generates five beam antennas；
Fig. 2 is the compound direction figure of 2700MHz five wave beams of frequency when the prior art widens 1700-2700MHz frequency range；
Fig. 3 is the radiating element arrangement of five beam antenna of wideband of the invention；
Fig. 4 is the line graph of radiating element of the present invention and 3 tunnel power divider circuits；
Fig. 5 is the connection figure of beam-forming network of the present invention；
Fig. 6 is the connection figure of the second power divider network and phase compensating circuit of the invention；
Fig. 7 is the compound direction figure of five wave beam 2200MHz frequencies of emulation of the embodiment of the present invention；
Fig. 8 is the compound direction figure of five wave beam 2700MHz frequencies of emulation of the embodiment of the present invention.
[specific embodiment]
Purpose, structure, feature and effect to facilitate the understanding of the present invention etc., now in conjunction with attached drawing and specific implementation
The invention will be further described for mode.
In the present invention, five beam array antenna of wideband includes a metallic reflection plate, a radiation cell array, multiple phases benefit
Repay circuit, multiple beam-forming networks, the first power divider network and the second power divider network, five waves of beam-forming network
Beam is mainly generated by beam-forming network, and each beam-forming network includes 23 × 3 butler matrix circuitries, and multiple 2 tunnels are mixed
Clutch circuit, phase shifter circuit and power distributing network.The input port of 2 road blender circuit is beam-forming network
Input port, the output port of power distributing network is the output port of beam-forming network.3 × 3 butler matrix
Circuit is made of three mixers and more than one phase shifter.
Below in conjunction with attached drawing and specific embodiment, technical solution of the present invention is described in detail.
Five beam antenna of a kind of wide-band provided in an embodiment of the present invention, the pitching face electrical tilt of each wave beam are fixed,
Including metallic reflection plate, radiation cell array, multiple beam-forming networks, the first power divider network, the second power divider network, and
Phase compensating circuit.
The adjacent rows of radiation cell array in arrangement using horizontal direction offset by the way of, as shown in Figure 3.Multiple radiation
Unit 101 is in line, and radiating element horizontal space is HD, and vertical interval VD, the distance of adjacent rows offset is HD1.
Preferably, radiating element number N=10 of every a line and horizontal space is equal, the vertical interval phase of line number M=6 and adjacent rows
Deng；Preferably, the second row radiating element 112, fourth line radiating element 114 and the 6th row radiating element 116 are both with respect to first
111 right avertence of row moves HD1；The third line radiating element 113 is with fifth line radiating element 115 relative to the first row 111 without offset.It is preferred that
Ground, radiating element 101 are ± 45 dual-polarized cross dipole antennas, paster antenna and slot antenna.
Preferably, the radiating element of every a line is connected with the output port of the first power divider network, first power splitter
Network is made of multiple 3 tunnels power divider circuit, and 3 tunnel power divider circuit quantity are 4 × N.Three identical water of each column in array
The radiating element that prosposition is set is connected with the same 3 tunnel power divider circuit output port, as shown in Figure 4.First row radiating element connects
Connect it is as follows, radiating element d11, d31 and d51+45 polarization connection 3 tunnel power divider circuit, 201 output ports, radiating element d21,
+ 45 polarization of d41 and d61 connect another 3 tunnel power divider circuit, 202 output port.Other column radiating elements and 3 Lu Gongfen
The connection of device circuit is similar.The polarized connection of radiating element+45 is shown in Fig. 4, and -45 polarized connections are similar.
Preferably, the input port of 3 tunnel power divider circuits is connected with the output port of beam-forming network, as shown in Figure 5.
Connect the output port of the input port connection beam-forming network 301 of 3 tunnel power divider circuits of the 1st, 3,5 row radiating elements；
Connect the output port of the input port connection beam-forming network 302 of 3 tunnel power divider circuits of the 2nd, 4,6 row radiating elements.
+ 45 polarized connection figures are shown in Fig. 5, and -45 polarized connections are similar.
The beam-forming network contains 5 input ports, and output port number is equal to the columns N=10 of array.Described 2
The input port of road blender circuit is the input port of beam-forming network, and the output port of 2 road blender circuits, which connects, to be moved
Phase device circuit.The input port of 3 × 3 butler matrix circuitry connects phase shifter circuit, 3 × 3 butler matrix circuitries
The input port of output port connection power distributing network.The power distributing network is made of multiple 2 tunnels power divider circuit, is used for
The conical distribution of the every a line radiating element amplitude of array is formed to inhibit azimuth secondary lobe.The output port of power distributing network is
The output port of beam-forming network.
Preferably, the input port of beam-forming network connects the second power divider network, such as Fig. 6 by phase compensating circuit
It is shown.Second power divider network is made of multiple 2 tunnels power divider circuit.The phase compensating circuit includes two independent biographies
Defeated route, phase difference between the two are φ.The input port 413,423 of beam-forming network third wave beam connects 2 road power splitters
Circuit 503；The input port 411,421 of first wave beam is connected to 2 tunnel power divider circuits 501 by phase compensating circuit 401；The
The input port 412,422 of two wave beams is connected to 2 tunnel power divider circuits 502 by phase compensating circuit 402；4th wave beam it is defeated
Inbound port 414,424 is connected to 2 tunnel power divider circuits 504 by phase compensating circuit 403；The input port 415 of 5th wave beam,
425 are connected to 2 tunnel power divider circuits 505 by phase compensating circuit 404.- 45 polarized connections are similar.
Preferably, the horizontal-shift distance HD1 of every a line radiating element is the half of radiating element horizontal distance, i.e. HD1
=HD/2, first and the 5th the phase difference of the corresponding phase compensating circuit of wave beam be 60 degree, second and the 4th corresponding phase of wave beam
The phase difference of bit compensation circuit is 30 degree.
Compared with existing five beam technique, the present invention is by being staggered to array element and covering beam-forming network more
To realize technical advantage.The array layout arranged using 6 rows 10, five wave beam of azimuthal plane of analogue simulation is shown in Fig. 7 and 8
Compound direction figure, display frequency are respectively 2200MHz and 2700MHz.Radiating element uses cross dipole antenna in simulation model,
Vertical dip angle is 6 degree.Simulation result shows that secondary lobe and grating lobe suppression are better than 18dB, and wave beam cross level is 9.5dB, 10dB
Beam angle range 80-140 degree.
Five beam antenna electrical tilt angles of embodiment are fixed, the scene for being suitble to user very intensive, such as large-scale body
Educate venue, performing art centre and square.By carrying out fine small Division to application scenarios such as venues, five wave beam days of more pairs are used
The promotion at double of message capacity may be implemented in line.The conventional basestation antennas for being 65 degree relative to traditional beam angle, not only leads to
It crosses cell splitting and increases capacity, and there is lower azimuth secondary lobe in ultra-wideband (45%) range, the adjacent area of cell is interfered
Small, network rate is high.5 traditional sectors, which divide, needs 5 narrow beam antennas, each antenna is very huge, installs simultaneously
Extremely difficult on mast, the present embodiment realizes that 5 sectors only need common antenna, it may be convenient to which configuration is on mast.
It is emphasized that in above embodiments, in aerial array between the two neighboring radiating element of horizontal direction
Spacing be it is fixed, i.e., radiating element equidistantly arranges.However, in practical engineering applications, oscillator unit can also be with
It is that unequal spacing arranges.Likewise, two oscillators in vertical direction are also possible to unequal spacing arrangement.In embodiment
In, the 2nd, 4,6 rows moved relative to the 1st, 3,5 row right avertence, in practical applications, be also possible to left avertence shifting.This oscillator arrangement
The multi-beam directional diagram within the scope of ultra-wideband with low sidelobe also may be implemented, due to not departing from this hair in the situation staggeredly changed
Bright design, also within protection scope of the present invention.
Above-mentioned five beam array antenna of wideband, each subarray includes N number of radiating element arranged in the horizontal direction, more
A subarray deviates in the horizontal direction, multiple phase compensating circuits, carries out phase compensation to the subarray of horizontal direction offset, this
The arrangement scheme that sample is deviated according to certain rule in the horizontal direction using the radiating element that do not go together, and to inclined in feeding network
The radiating element of shifting adds certain phase compensation, and five beam antennas in ultratvide frequency band all there is preferable secondary lobe and graing lobe to press down
Performance processed reduces the adjacent area interference of wave beam respective cell, realizes under conditions of not increasing antenna site and terrace resource adjacent
The channeling of cell improves network capacity.
Be described in detail above be only the preferred embodiments of the invention explanation, non-therefore limitation the scope of the patents of the invention,
So all equivalence techniques with carried out by this creation specification and diagramatic content change, it is both contained in the scope of the patents of the invention
It is interior.
Claims (10)
1. a kind of five beam array antenna of wideband characterized by comprising
One metallic reflection plate；
One radiation cell array, it includes M subarray, each subarray includes N number of radiation list arranged in the horizontal direction
Member, at least one subarray deviate in the horizontal direction；
Multiple phase compensating circuits carry out phase compensation to the subarray of horizontal direction offset；
Multiple beam-forming networks, it includes 23 × 3 butler matrix circuitries, multiple 2 roads blender circuit, phase shifter circuit
And power distributing network.Beam-forming network, the first input port comprising forming the first wave beam, forms the second of the second wave beam
Input port forms the third input port of third wave beam, forms the 4th input port of the 4th wave beam, and form the 5th wave beam
The 5th input port；
First power divider network and the second power divider network, the first power divider network include multiple power divider circuits, power splitter
The output end of circuit connects the radiating element positioned at the same horizontal position that do not go together, and power divider circuit input terminal connects wave beam shape
At the output end of network；Second power divider network is made of multiple two roads power splitter；
3 × 3 butler matrix circuitry is made of three mixers and at least one phase shifter, 3 × 3 butler matrixs
The input port of circuit connects the output port of 2 road blender circuits by phase shifter circuit, 3 × 3 butler matrix circuitries
Output port connects the input port of power distributing network, and the input ports of 2 road blender circuits is the of beam-forming network
One input port, the second input port, third input port, the 4th input port and the 5th input port, power distributing network
Output port be beam-forming network output port；
The azimuth coverage of first wave beam is 30 to 55 degree, and the azimuth coverage of the second wave beam is 15 to 23 degree, third wave
The azimuth of beam is 0 degree, and the azimuth coverage of the 4th wave beam is -15 to -23 degree, the azimuth coverage of the 5th wave beam for -30 to -
55 degree；
The first input port of the beam-forming network, the second input port, the 4th input port and the 5th input port are logical
Cross the output port that phase compensating circuit connects the second power divider network；
The input port of second power divider network is as antenna rf input port.
2. five beam array antenna of wideband as claimed in claim 1, it is characterised in that: radiating element is dual polarized antenna unit.
3. five beam array antenna of wideband as claimed in claim 1, it is characterised in that: the number M of subarray is 6, each height
The number N of radiating element is 10 in array.
4. five beam array antenna of wideband as claimed in claim 1, it is characterised in that: multiple radiating element edges of each subarray
The arrangement of one horizontal line, 3 subarrays deviate in the horizontal direction.
5. five beam array antenna of wideband as claimed in claim 1, it is characterised in that: the horizontal space phase of each subarray radiating element
Deng the vertical interval between each subarray is equal.
6. five beam array antenna of wideband as claimed in claim 1, it is characterised in that: 3 subarrays deviate in the horizontal direction away from
From the half for radiating element horizontal space.
7. five beam array antenna of wideband as claimed in claim 1, it is characterised in that: phase compensating circuit includes 2 individual transmissions
Route, the two phase difference are φ.
8. five beam array antenna of wideband as claimed in claim 1, it is characterised in that: the first power divider network includes multiple 3 roads function
Divide device circuit, the second power divider network includes multiple 2 tunnels power divider circuit.
9. five beam array antenna of wideband as claimed in claim 8, it is characterised in that: the output port of 3 tunnel power divider circuits connects
The input port of three radiating elements positioned at the same horizontal position that do not go together, 3 tunnel power divider circuits connects Wave beam forming net
The output port of network.
10. five beam array antenna of wideband as claimed in claim 1, it is characterised in that: the first input port of beam-forming network
It is equal with the phase difference of the 5th input port, corresponding phase compensation circuit；Second input port of beam-forming network and the 4th
The phase difference of input port, corresponding phase compensation circuit is equal.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610803078.6A CN106159465B (en) | 2016-09-05 | 2016-09-05 | Five beam array antenna of wideband |
| PCT/CN2016/099281 WO2018040140A1 (en) | 2016-09-05 | 2016-09-19 | Broadband five-beam array antenna |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610803078.6A CN106159465B (en) | 2016-09-05 | 2016-09-05 | Five beam array antenna of wideband |
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| Publication Number | Publication Date |
|---|---|
| CN106159465A CN106159465A (en) | 2016-11-23 |
| CN106159465B true CN106159465B (en) | 2019-08-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610803078.6A Active CN106159465B (en) | 2016-09-05 | 2016-09-05 | Five beam array antenna of wideband |
Country Status (2)
| Country | Link |
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| CN (1) | CN106159465B (en) |
| WO (1) | WO2018040140A1 (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6756300B2 (en) * | 2017-04-24 | 2020-09-16 | 株式会社村田製作所 | Array antenna |
| CN108461932B (en) * | 2018-01-30 | 2024-01-30 | 广东博纬通信科技有限公司 | Low-complexity analog beam forming antenna array |
| CN108666769A (en) * | 2018-03-29 | 2018-10-16 | 广东博纬通信科技有限公司 | A kind of nine beam array antenna of wideband |
| CN108832307A (en) * | 2018-05-30 | 2018-11-16 | 华为技术有限公司 | A kind of beam-shaped antenna |
| WO2020073362A1 (en) * | 2018-10-12 | 2020-04-16 | 广东博纬通信科技有限公司 | Broadband six-beam array antenna |
| CN112072309B (en) * | 2020-09-03 | 2023-02-28 | 中国电子科技集团公司第三十八研究所 | Step-compensation low-cost phased array antenna framework and design method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102257674A (en) * | 2008-11-20 | 2011-11-23 | 安德鲁有限责任公司 | Dual-beam sector antenna and array |
| CN105356062A (en) * | 2015-10-23 | 2016-02-24 | 广东博纬通信科技有限公司 | Broadband array antenna |
| CN105742828A (en) * | 2016-03-31 | 2016-07-06 | 广东通宇通讯股份有限公司 | Dual-polarization three-beam antenna and feed network device thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6922169B2 (en) * | 2003-02-14 | 2005-07-26 | Andrew Corporation | Antenna, base station and power coupler |
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2016
- 2016-09-05 CN CN201610803078.6A patent/CN106159465B/en active Active
- 2016-09-19 WO PCT/CN2016/099281 patent/WO2018040140A1/en active Application Filing
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102257674A (en) * | 2008-11-20 | 2011-11-23 | 安德鲁有限责任公司 | Dual-beam sector antenna and array |
| CN105356062A (en) * | 2015-10-23 | 2016-02-24 | 广东博纬通信科技有限公司 | Broadband array antenna |
| CN105742828A (en) * | 2016-03-31 | 2016-07-06 | 广东通宇通讯股份有限公司 | Dual-polarization three-beam antenna and feed network device thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2018040140A1 (en) | 2018-03-08 |
| CN106159465A (en) | 2016-11-23 |
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Application publication date: 20161123 Assignee: Zhongtian Communication Technology Co.,Ltd. Assignor: GUANGDONG BROADRADIO COMMUNICATION TECHNOLOGY Co.,Ltd. Contract record no.: X2023980042202 Denomination of invention: Broadband five beam array antenna Granted publication date: 20190802 License type: Common License Record date: 20230920 |
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