CN111162757A - Internet of things duplexer - Google Patents
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- CN111162757A CN111162757A CN201811320812.9A CN201811320812A CN111162757A CN 111162757 A CN111162757 A CN 111162757A CN 201811320812 A CN201811320812 A CN 201811320812A CN 111162757 A CN111162757 A CN 111162757A
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- 230000037431 insertion Effects 0.000 claims description 35
- 239000000758 substrate Substances 0.000 claims description 18
- 238000002955 isolation Methods 0.000 claims description 9
- 238000010897 surface acoustic wave method Methods 0.000 claims description 6
- 239000010409 thin film Substances 0.000 claims description 2
- 230000006855 networking Effects 0.000 abstract description 14
- 239000004020 conductor Substances 0.000 abstract description 4
- 239000000463 material Substances 0.000 abstract description 4
- 238000002360 preparation method Methods 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 8
- QVFWZNCVPCJQOP-UHFFFAOYSA-N chloralodol Chemical compound CC(O)(C)CC(C)OC(O)C(Cl)(Cl)Cl QVFWZNCVPCJQOP-UHFFFAOYSA-N 0.000 description 5
- 238000004891 communication Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 2
- 239000011797 cavity material Substances 0.000 description 2
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- 239000010408 film Substances 0.000 description 1
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H11/00—Networks using active elements
- H03H11/02—Multiple-port networks
- H03H11/34—Networks for connecting several sources or loads working on different frequencies or frequency bands, to a common load or source
- H03H11/344—Duplexers
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H11/00—Networks using active elements
- H03H11/02—Multiple-port networks
- H03H11/34—Networks for connecting several sources or loads working on different frequencies or frequency bands, to a common load or source
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Abstract
The embodiment of the application provides an thing networking duplexer, includes: the first port, a first band-pass filter circuit connected with the first port, a second band-pass filter circuit connected with the second port, a third port, and a third band-pass filter circuit, wherein one end of the third port is connected with the third port, and the other end of the third port is connected with the first band-pass filter circuit and the second band-pass filter circuit; the first band-pass filter circuit and the third band-pass filter circuit form a first channel between a first port and a third port; the second band-pass filter circuit and the third band-pass filter circuit form a second channel between the second port and the third port. The thing networking duplexer of this application embodiment need not adopt prior art's waveguide conductor material preparation, can reduce the size and the weight of thing networking duplexer under the condition that satisfies the thing networking index.
Description
Technical Field
The application relates to the technical field of communication, in particular to a duplexer of the Internet of things.
Background
The LoRa is an ultra-long distance transmission scheme based on spread spectrum technology in the thing networking, has characteristics such as transmission distance is far away, low-power consumption, multinode and low cost, and in the thing networking deployment, the LoRa gateway can adopt the duplexer to carry out full duplex communication.
At present, duplexers used in the field of Internet of things are all made of waveguide conductor materials, the isolation index of the duplexer is adjusted by adjusting the area of a waveguide surface wave-absorbing material, and the passband frequency and the insertion loss index of the duplexer are adjusted by controlling the impedance of a PCB (printed circuit board).
The duplexer utilizes a cavity material to manufacture two high-frequency band-pass filters and low-pass filters firstly, then the two high-frequency band-pass filters and the low-pass filters are matched together, and then the duplexer is manufactured by adjusting and matching the band-pass filters and the low-pass filters through the band-pass filters. Due to the limitation of the manufacturing process, the size of the device is large, generally the size is over 10cm, the weight is heavy, and mass production is not easy. In addition, if the LoRa gateway is installed in such a duplexer, the size of the LoRa gateway is also limited, so that the size of the LoRa gateway cannot be reduced.
Disclosure of Invention
In view of the above, embodiments of the present application are proposed to provide a duplexer that overcomes or at least partially solves the above problems.
In order to solve the above problem, an embodiment of the present application discloses an internet of things duplexer, including:
the first port is connected with the first power supply,
a first bandpass filter circuit connected to the first port,
the second port is connected with the first port,
a second band pass filter circuit connected to the second port,
a third port, and
a third band-pass filter circuit having one end connected to the third port and the other end connected to the first band-pass filter circuit and the second band-pass filter circuit;
the first band-pass filter circuit and the third band-pass filter circuit form a first channel between a first port and a third port;
the second band-pass filter circuit and the third band-pass filter circuit form a second channel between the second port and the third port.
Preferably, the first band-pass filter circuit includes: a first band pass filter connected to the first port, and a first matching circuit connected to the first band pass filter;
the second band-pass filter circuit includes: a second band pass filter connected to the second port, and a second matching circuit connected to the second band pass filter;
the third band-pass filter circuit includes: a third band-pass filter connected to the third port, and a third matching circuit connected to the third band-pass filter;
the first matching circuit, the second matching circuit and the third matching circuit are connected at the same end.
Preferably, the first band-pass filter, the second band-pass filter and the third band-pass filter are surface acoustic wave filters or thin film cavity acoustic resonator filters.
Preferably, the first matching circuit, the second matching circuit, and the third matching circuit are pi-type matching circuits.
Preferably, the method further comprises the following steps: a substrate;
the first port, the first band pass filter, the first matching circuit, the second port, the second band pass filter, the second matching circuit, the third port, the third band pass filter, and the third matching circuit are formed on the substrate.
Preferably, the isolated frequency band is greater than or equal to 10 MHz.
Preferably, the in-band insertion loss of the first passband frequency band is 2.5dB-3.5dB, and the out-of-band rejection is less than-45 dB;
the in-band insertion loss of the second passband frequency band is 2.5dB-3.5dB, and the out-of-band rejection is less than-45 dB.
Preferably, the in-band insertion loss of the fourth passband frequency band of the first bandpass filter is less than or equal to 1dB, the in-band width is 2MHz, and the out-of-band rejection is less than-50 dB;
the in-band insertion loss of a fifth passband frequency band of the second band-pass filter is less than or equal to 1dB, the in-band width is 2MHz, and the out-of-band rejection is less than-50 dB;
the in-band insertion loss of a sixth passband frequency band of the third band-pass filter is less than or equal to 1dB, the in-band width is greater than or equal to 14MHz, and the out-of-band rejection is less than-50 dB.
The embodiment of the application also discloses thing networking duplexer includes: the device comprises a shell, a substrate accommodated in the shell, a first port, a first band-pass filter circuit connected with the first port, a second band-pass filter circuit connected with the second port, a third port and a third band-pass filter circuit, wherein one end of the third port is connected with the third port, and the other end of the third port is connected with the first band-pass filter circuit and the second band-pass filter circuit;
the first band-pass filter circuit and the third band-pass filter circuit form a first channel between a first port and a third port;
the second band-pass filter circuit and the third band-pass filter circuit form a second channel between a second port and a third port;
the first port, the first band pass filter, the first matching circuit, the second port, the second band pass filter, the second matching circuit, the third port, the third band pass filter, and the third matching circuit are formed on the substrate.
The embodiment of the application has the following advantages:
in an embodiment of the present application, a first channel between a first port and a third port is capable of transmitting signals of a first pass band; a second channel between the second port and the third port is capable of transmitting signals of a second passband frequency band; the first channel and the second channel are independent of each other. Signals of the two passband frequency bands can be transmitted from the two channels simultaneously respectively, mutual influence is avoided, and duplex communication is achieved. The thing networking duplexer of this application embodiment need not adopt prior art's waveguide conductor material preparation, can reduce the size and the weight of thing networking duplexer under the condition that satisfies the thing networking index.
Drawings
Fig. 1 is a block diagram of an embodiment of an internet of things duplexer of the present application;
fig. 2 is a structural diagram of an example of an internet of things duplexer in an embodiment of the present application.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, the present application is described in further detail with reference to the accompanying drawings and the detailed description.
Referring to fig. 1, a structure diagram of an embodiment of an internet of things duplexer in the present application is shown, which may specifically include:
a first port 10, a first band-pass filter circuit 11 connected to the first port 10, a second port 12, a second band-pass filter circuit 13 connected to the second port 12, a third port 14, and a third band-pass filter circuit 15 having one end connected to the third port 14 and the other end connected to the first band-pass filter circuit 11 and the second band-pass filter circuit 13;
the first band-pass filter circuit 11 and the third band-pass filter circuit 15 form a first channel between the first port 10 and the third port 14;
the second band-pass filter circuit 13 and the third band-pass filter circuit 15 form a second channel between the second port 12 and the third port 14.
In the embodiment of the present application, the first port 10 may be a receiving port or a transmitting port, the second port 12 may be a transmitting port or a receiving port, and the third port 14 may be a common antenna port. A first passband frequency band of the first port 10 is a passband frequency band of the first bandpass filter circuit 11, a second passband frequency band of the second port 12 is a passband frequency band of the second bandpass filter circuit 13, and a third passband frequency band of the third port 14 is a passband frequency band of the third bandpass filter circuit 15.
A first channel between the first port 10 and the third port 14 is capable of transmitting signals in a first passband frequency band and a second channel between the second port 12 and the third port 14 is capable of transmitting signals in a second passband frequency band, the first channel and the second channel being independent of each other. Signals of the two passband frequency bands can be transmitted from the two channels simultaneously respectively, mutual influence is avoided, and duplex communication is achieved. For example, the first port 10 may be a receiving port RX, the second port 12 may be a transmitting port TX, and the third port 14 may be an antenna port ANT. A signal of a first pass band may be input from the first port 10 and output from the third port 14 through the first channel; meanwhile, a signal of a second pass band may be input from the third port 14 and output from the second port 12 through the second channel. The thing networking duplexer of this application embodiment need not adopt prior art's waveguide conductor material preparation, can reduce the size and the weight of thing networking duplexer under the condition that satisfies the thing networking index.
In the embodiment of the application, an isolation frequency band is arranged between the first passband frequency band and the second passband frequency band; in order to meet the requirement of the internet of things field, in the embodiment of the present application, the isolation frequency band between the first passband frequency band of the first port and the second passband frequency band of the second port may be 10MHz, and is allowed to move up and down. The width of the first passband frequency band and the width of the second passband frequency band may be 2MHz and allowed to float up and down. The third passband frequency band comprises a first passband frequency band, a second passband frequency band and an isolation frequency band, namely the third passband frequency band can be 14MHZ and is allowed to float up and down.
Referring to fig. 2, a block diagram of an example of an internet of things duplexer in an embodiment of the present application is shown, where the first bandpass filter circuit 11 may include: a first band-pass filter 111 connected to the first port 10, and a first matching circuit 112 connected to the first band-pass filter 111;
the second band-pass filter circuit 13 may include: a second band-pass filter 131 connected to the second port 12, and a second matching circuit 132 connected to the second band-pass filter 131;
the third band-pass filter circuit 15 may include: a third band-pass filter 151 connected to the third port 14, and a third matching circuit 152 connected to the third band-pass filter 151;
the first matching circuit 112, the second matching circuit 132 and the third matching circuit 152 are connected at the same end.
In the embodiment of the present application, the first passband frequency band of the first port 10 is determined by the fourth passband frequency band of the first bandpass filter 111 and the first matching circuit 112. The circuit index can be adjusted by adjusting the first matching circuit 112, the fourth passband frequency band of the first bandpass filter 111 is usually fixed, and the first passband frequency band can be adjusted by adjusting the first matching circuit 112.
The in-band width of the first bandpass filter 111 may be 2MHz, so that the in-band width of the first passband frequency band may be 2 MHz. The second band pass filter 131 may have an in-band width of 2MHz such that the second pass band frequency band may have an in-band width of 2 MHz. The first band pass filter 111 and the second band pass filter 131 have an isolation band of 10MHz therebetween, so that the first pass band and the second pass band have an isolation band of 10MHz therebetween. The third band pass filter 151 may have an in-band width greater than or equal to 14 MHz.
In order to meet the requirement of the field of the internet of things, the first passband frequency band should meet the indexes that the in-band insertion loss is 3dB and the out-of-band rejection is-45 dB, but in practice, the in-band insertion loss of the first passband frequency band can be 2.5dB-3.5dB, and the out-of-band rejection can be less than-45 dB.
Specifically, the in-band insertion loss of the first passband is determined by the in-band insertion loss of the first bandpass filter 111, the in-band insertion loss of the third bandpass filter 151, and the first matching circuit 112 and the third matching circuit 152. In order to make the first passband frequency band satisfy the index that the in-band insertion loss is 3dB, the in-band insertion loss of the first bandpass filter 111 may be optimized such that the in-band insertion loss of the first bandpass filter 111 may be less than or equal to 1 dB; the in-band insertion loss of the third band-pass filter 151 may be optimized such that the in-band insertion loss of the third band-pass filter 151 may be less than or equal to 1 dB; the first matching circuit 112 and/or the third matching circuit 152 may be adjusted to adjust the in-band insertion loss for the first pass band.
However, optimizing the in-band insertion loss of the band pass filter reduces the isolation, so the index of the out-of-band rejection of the first band pass filter 111 and the third band pass filter 151 needs to be improved, and the out-of-band rejection of the first band pass filter 111 and the third band pass filter 151 can be less than-50 dB. Since the first passband out-of-band rejection is indexed to-45 dB, 5dB of difference may be provided by the first matching circuit 112 and the third matching circuit 152.
The second passband frequency band of the second port 12 is determined by the fifth passband frequency band of the second bandpass filter 131 and the second matching circuit 132. The circuit index can be adjusted by adjusting the second matching circuit 132, the fifth passband frequency band of the second bandpass filter 131 is generally fixed, and the second passband frequency band can be adjusted by adjusting the second matching circuit 132.
In order to meet the requirement of the field of the internet of things, the second passband frequency band should meet the indexes that the in-band insertion loss is 3dB and the out-of-band rejection is-45 dB, but in practice, the in-band insertion loss of the second passband frequency band can be 2.5dB-3.5dB, and the out-of-band rejection can be less than-45 dB.
Specifically, the in-band insertion loss of the second passband is determined by the in-band insertion loss of the second bandpass filter 131, the in-band insertion loss of the third bandpass filter 151, the second matching circuit 132, and the third matching circuit 152. In order to make the second passband frequency band meet the index of 3dB in-band insertion loss, the in-band insertion loss of the second bandpass filter 131 may be optimized such that the in-band insertion loss of the second bandpass filter 131 may be less than or equal to 1 dB; the in-band insertion loss of the third band-pass filter 151 may be optimized such that the in-band insertion loss of the third band-pass filter 151 may be less than or equal to 1 dB; the second matching circuit 132 and/or the third matching circuit 152 may be adjusted to adjust the in-band insertion loss for the second pass band.
However, optimizing the in-band insertion loss of the band-pass filter reduces the isolation, so the out-band rejection index of the second band-pass filter 131 and the third band-pass filter 151 needs to be improved, and the out-band rejection of the second band-pass filter 131 and the third band-pass filter 151 can be less than-50 dB. Since the second passband out-of-band rejection is indexed to-45 dB, 5dB of difference may be provided by the second matching circuit 132 and the third matching circuit 152.
The third passband frequency band of the third port 14 is determined by the sixth passband frequency band of the third bandpass filter 151 and the third matching circuit 152. The circuit specifications can be adjusted by adjusting the third matching circuit 152, the sixth passband frequency band of the third bandpass filter 151 is generally fixed, and the third passband frequency band can be adjusted by adjusting the third matching circuit 152.
In the embodiment of the present application, the first band pass filter 111, the second band pass filter 131, and the third band pass filter 151 may be a Surface Acoustic Wave (SAW) filter or a Film Bulk Acoustic Resonator (FBAR) filter.
The SAW filter or the FBAR filter has small volume, so that the volume of the duplexer can be small, and the requirement of the field of the Internet of things can be met.
In the embodiment of the present application, the first matching circuit 112, the second matching circuit 132, and the third matching circuit 152 may be pi-type matching circuit, L-type matching circuit, or even dual L-type matching circuit. The specific matching circuit is determined according to the circuit debugging difficulty, the general L-shaped circuit is simplest, the pi-shaped matching circuit has one more matching position than the L-shaped circuit, the flexibility is stronger, and the circuit result is easier to debug. Therefore, pi-type matching circuits may be preferable as the first matching circuit 112, the second matching circuit 132, and the third matching circuit 152.
In this embodiment, the internet of things duplexer may further include: a substrate (not shown);
the first port 10, the first band pass filter 111, the first matching circuit 112, the second port 12, the second band pass filter 131, the second matching circuit 132, the third port 14, the third band pass filter 151, and the third matching circuit 152 are formed on the substrate.
The substrate may be a ceramic substrate, and when a SAW filter or an FBAR filter is used as the first band pass filter 111, the second band pass filter 131, and the third band pass filter 151, the substrate may be a ceramic substrate. Etching a wafer of the filter on the substrate, and then manufacturing the filter on the wafer; and other circuits are fabricated on the substrate.
The embodiment of the application also discloses thing networking duplexer includes: the device comprises a shell, a substrate accommodated in the shell, a first port, a first band-pass filter circuit connected with the first port, a second band-pass filter circuit connected with the second port, a third port and a third band-pass filter circuit, wherein one end of the third port is connected with the third port, and the other end of the third port is connected with the first band-pass filter circuit and the second band-pass filter circuit;
the first band-pass filter circuit and the third band-pass filter circuit form a first channel between a first port and a third port;
the second band-pass filter circuit and the third band-pass filter circuit form a second channel between a second port and a third port;
the first port, the first band pass filter, the first matching circuit, the second port, the second band pass filter, the second matching circuit, the third port, the third band pass filter, and the third matching circuit are formed on the substrate.
The specific structures of the first band-pass filter circuit, the second band-pass filter circuit, and the third band-pass filter circuit may refer to the above embodiments, which are not described herein again.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or terminal that comprises the element.
The internet of things duplexer provided by the application is introduced in detail, a specific example is applied in the detailed description to explain the principle and the implementation of the application, and the description of the embodiment is only used for helping to understand the method and the core idea of the application; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.
Claims (9)
1. An IOT duplexer, comprising:
the first port is connected with the first power supply,
a first bandpass filter circuit connected to the first port,
the second port is connected with the first port,
a second band pass filter circuit connected to the second port,
a third port, and
a third band-pass filter circuit having one end connected to the third port and the other end connected to the first band-pass filter circuit and the second band-pass filter circuit;
the first band-pass filter circuit and the third band-pass filter circuit form a first channel between a first port and a third port;
the second band-pass filter circuit and the third band-pass filter circuit form a second channel between the second port and the third port.
2. The Internet of things duplexer of claim 1,
the first band pass filter circuit includes: a first band pass filter connected to the first port, and a first matching circuit connected to the first band pass filter;
the second band-pass filter circuit includes: a second band pass filter connected to the second port, and a second matching circuit connected to the second band pass filter;
the third band-pass filter circuit includes: a third band-pass filter connected to the third port, and a third matching circuit connected to the third band-pass filter;
the first matching circuit, the second matching circuit and the third matching circuit are connected at the same end.
3. The Internet of things duplexer of claim 2, wherein the first band-pass filter, the second band-pass filter and the third band-pass filter are surface acoustic wave filters or thin film cavity acoustic resonator filters.
4. The IOT duplexer of claim 2, wherein the first, second and third matching circuits are pi-type matching circuits.
5. The IOT duplexer of claim 2, further comprising:
a substrate;
the first port, the first band pass filter, the first matching circuit, the second port, the second band pass filter, the second matching circuit, the third port, the third band pass filter, and the third matching circuit are formed on the substrate.
6. The Internet of things duplexer of claim 2, wherein the isolation frequency band is greater than or equal to 10 MHz.
7. The IOT duplexer of claim 6,
the in-band insertion loss of the first passband frequency band is 2.5dB-3.5dB, and the out-of-band rejection is less than-45 dB;
the in-band insertion loss of the second passband frequency band is 2.5dB-3.5dB, and the out-of-band rejection is less than-45 dB.
8. The IOT duplexer of claim 7,
the in-band insertion loss of a fourth passband frequency band of the first bandpass filter is less than or equal to 1dB, the in-band width is 2MHz, and the out-of-band rejection is less than-50 dB;
the in-band insertion loss of a fifth passband frequency band of the second band-pass filter is less than or equal to 1dB, the in-band width is 2MHz, and the out-of-band rejection is less than-50 dB;
the in-band insertion loss of a sixth passband frequency band of the third band-pass filter is less than or equal to 1dB, the in-band width is greater than or equal to 14MHz, and the out-of-band rejection is less than-50 dB.
9. An IOT duplexer, comprising: the device comprises a shell, a substrate accommodated in the shell, a first port, a first band-pass filter circuit connected with the first port, a second band-pass filter circuit connected with the second port, a third port and a third band-pass filter circuit, wherein one end of the third port is connected with the third port, and the other end of the third port is connected with the first band-pass filter circuit and the second band-pass filter circuit;
the first band-pass filter circuit and the third band-pass filter circuit form a first channel between a first port and a third port;
the second band-pass filter circuit and the third band-pass filter circuit form a second channel between a second port and a third port;
the first port, the first band pass filter, the first matching circuit, the second port, the second band pass filter, the second matching circuit, the third port, the third band pass filter, and the third matching circuit are formed on the substrate.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811320812.9A CN111162757A (en) | 2018-11-07 | 2018-11-07 | Internet of things duplexer |
| TW108129252A TW202025628A (en) | 2018-11-07 | 2019-08-16 | Internet of things duplexer |
| PCT/CN2019/113272 WO2020093881A1 (en) | 2018-11-07 | 2019-10-25 | Internet of things duplexer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811320812.9A CN111162757A (en) | 2018-11-07 | 2018-11-07 | Internet of things duplexer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111162757A true CN111162757A (en) | 2020-05-15 |
Family
ID=70554644
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811320812.9A Pending CN111162757A (en) | 2018-11-07 | 2018-11-07 | Internet of things duplexer |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN111162757A (en) |
| TW (1) | TW202025628A (en) |
| WO (1) | WO2020093881A1 (en) |
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- 2018-11-07 CN CN201811320812.9A patent/CN111162757A/en active Pending
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| KR20060067194A (en) * | 2004-12-14 | 2006-06-19 | 자화전자 주식회사 | Cdma / wireless broad band switch module circuit |
| KR100631636B1 (en) * | 2005-04-26 | 2006-10-11 | 엘지전자 주식회사 | Triplexer circuit for mobile communication device |
| KR20110047303A (en) * | 2009-10-30 | 2011-05-09 | 전자부품연구원 | Duplexer |
| CN103208669A (en) * | 2013-01-16 | 2013-07-17 | 天津大学 | Piezoelectric sound wave duplexer system |
| US20160359506A1 (en) * | 2013-12-11 | 2016-12-08 | Epcos Ag | Front end circuit and method of operating a front end circuit |
| CN108023568A (en) * | 2016-10-31 | 2018-05-11 | 株式会社村田制作所 | Filter apparatus, multiplexer, high frequency front end circuit and communicator |
| CN209488536U (en) * | 2018-11-07 | 2019-10-11 | 阿里巴巴集团控股有限公司 | A kind of Internet of Things duplexer |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2020093881A1 (en) | 2020-05-14 |
| TW202025628A (en) | 2020-07-01 |
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