CN111953357A - Communication transmission device - Google Patents

Communication transmission device Download PDF

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Publication number
CN111953357A
CN111953357A CN202010635581.1A CN202010635581A CN111953357A CN 111953357 A CN111953357 A CN 111953357A CN 202010635581 A CN202010635581 A CN 202010635581A CN 111953357 A CN111953357 A CN 111953357A
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CN
China
Prior art keywords
communication transmission
module
transmission assembly
signal
area
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Pending
Application number
CN202010635581.1A
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Chinese (zh)
Inventor
刘志凯
饶佩宗
廉亚军
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Shenzhen Jaguar Wave Technology Ltd
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Shenzhen Jaguar Wave Technology Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shenzhen Jaguar Wave Technology Ltd filed Critical Shenzhen Jaguar Wave Technology Ltd
Priority to CN202010635581.1A priority Critical patent/CN111953357A/en
Publication of CN111953357A publication Critical patent/CN111953357A/en
Pending legal-status Critical Current

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B1/00Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/005Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16MFRAMES, CASINGS OR BEDS OF ENGINES, MACHINES OR APPARATUS, NOT SPECIFIC TO ENGINES, MACHINES OR APPARATUS PROVIDED FOR ELSEWHERE; STANDS; SUPPORTS
    • F16M13/00Other supports for positioning apparatus or articles; Means for steadying hand-held apparatus or articles
    • F16M13/02Other supports for positioning apparatus or articles; Means for steadying hand-held apparatus or articles for supporting on, or attaching to, an object, e.g. tree, gate, window-frame, cycle

Abstract

The application discloses communication transmission device, this communication transmission device includes: the first communication transmission assembly is provided with a first wireless signal module; the second communication transmission component is provided with a second wireless signal module; the first communication transmission assembly and the second communication transmission assembly are respectively provided with an adsorption part for providing adsorption force so that the first communication transmission assembly and the second communication transmission assembly are fixed on the wall body; the first wireless signal module is used for converting millimeter wave signals and intermediate frequency signals, and the second wireless signal module is used for converting intermediate frequency signals and digital signals. By the scheme, the structural stability and the communication stability of the communication transmission device can be improved.

Description

Communication transmission device
Technical Field
The present application relates to the field of communications technologies, and in particular, to a communication transmission apparatus.
Background
In recent years, with the rapid development of network technologies and intelligent devices, communication between intelligent devices by means of network technologies is mainstream. However, due to the limitations of current networking and signaling technologies, communication between existing smart devices remains a drawback.
For example, the millimeter wave high frequency signal has an excellent application prospect in short-distance wireless communication by virtue of the advantages of short wavelength and wide frequency band. However, the penetration capability of the millimeter wave high-frequency signal is poor, the application and development of the millimeter wave are limited due to the poor penetration capability, and particularly in an actual application scene, when the millimeter wave high-frequency signal needs to pass through a wall surface or a glass surface for signal transmission, the through-wall transmission operation of the millimeter wave high-frequency signal can be completed only by means of an actual network cable.
Disclosure of Invention
The application provides at least a communication transmission device.
A first aspect of the present application provides a communication transmission apparatus, including:
the first communication transmission assembly is provided with a first wireless signal module;
the second communication transmission component is provided with a second wireless signal module;
the first communication transmission assembly and the second communication transmission assembly are respectively provided with an adsorption part for providing adsorption force so that the first communication transmission assembly and the second communication transmission assembly are fixed on a wall body;
the first wireless signal module is used for converting millimeter wave signals and intermediate frequency signals, and the second wireless signal module is used for converting the intermediate frequency signals and digital signals.
In some embodiments, the adsorption part includes an air pumping mechanism and an opening structure, the air pumping mechanism vacuumizes the opening structure, the opening structure is used for contacting with the wall, and the opening structure adsorbs the first communication transmission assembly and the second communication transmission assembly to the wall respectively when a negative pressure state is reached.
In some embodiments, the opening structure is disposed on a first surface of the first communication transmission assembly and a second surface of the second communication transmission assembly, where the first surface and the second surface are two surfaces of the first communication transmission assembly and the second communication transmission assembly opposite to each other fixed on the wall body.
In some embodiments, the first surface includes a first area and a second area, the intermediate frequency signal being transmitted to the second communication transport component via the first area;
the second surface includes a third area and a fourth area, the second communication transmission assembly receives the intermediate frequency signal via the third area, and the opening structures are respectively disposed on the second area and the fourth area.
In some embodiments, the first region of the first surface is disposed around the second region, and the third region of the second surface is disposed around the fourth region.
In some embodiments, the opening structure is a flexible, malleable and contractible material, and the opening structure is an inverted cone-like structure without an apex angle.
In some embodiments, the first communication transmission component is further provided with a first wireless charging module, and the second communication transmission component is further provided with a second wireless charging module; the first wireless charging module is arranged on the first area, and the second wireless charging module is arranged on the third area;
the second communication transmission assembly is electrically connected with the power supply, the second wireless charging module provides electric energy for the second wireless signal module and transmits the electric energy to the first wireless charging module, and the first wireless charging module is used for providing the electric energy for the first wireless signal module.
In some embodiments, the air pumping structure comprises a vacuum pump and an air duct, and the opening structure is provided with an air pumping hole; the vacuum pump is connected with the air exhaust hole through the air guide pipe and used for exhausting air in a closed space formed by the opening structure and the wall body.
In some embodiments, an air pressure sensor is further disposed in the closed space formed by the opening structure and the wall body, and the air pressure sensor is electrically connected with the vacuum pump;
the air pressure sensor is used for feeding back air pressure information in a closed space formed by the opening structure and the wall body to the vacuum pump, so that the vacuum pump can adjust output power according to the air pressure information.
In some embodiments, the first wireless signal module comprises a radio frequency module, and the second wireless signal module comprises a baseband module and a radio frequency chip;
the radio frequency module is used for converting the millimeter wave signal and the intermediate frequency signal, the radio frequency module is used for converting the intermediate frequency signal and an IQ signal, the baseband module is used for converting the IQ signal and a digital signal, and the radio frequency module and/or the radio frequency chip convert a signal which needs to pass through the wall body into the intermediate frequency signal;
wherein the digital signal comprises: HDMI video signals, USB signals, ethernet signals, optical fiber signals.
In this application, the communication transmission apparatus includes: the first communication transmission assembly is provided with a first wireless signal module; the second communication transmission component is provided with a second wireless signal module; the first communication transmission assembly and the second communication transmission assembly are respectively provided with an adsorption part for providing adsorption force so that the first communication transmission assembly and the second communication transmission assembly are fixed on the wall body; the first wireless signal module is used for converting millimeter wave signals and intermediate frequency signals, and the second wireless signal module is used for converting intermediate frequency signals and digital signals. By the scheme, the structural stability and the communication stability of the communication transmission device can be improved.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the application.
FIG. 1 is a block diagram of a 5G indoor coverage solution provided herein;
fig. 2 is a schematic structural diagram of an embodiment of a communication transmission apparatus provided in the present application;
fig. 3 is a schematic structural diagram of a wireless signal module according to an embodiment of the present disclosure.
Detailed Description
The following describes in detail the embodiments of the present application with reference to the drawings attached hereto.
In the following description, for purposes of explanation and not limitation, specific details are set forth such as particular system structures, interfaces, techniques, etc. in order to provide a thorough understanding of the present application.
The term "and/or" herein is merely an association describing an associated object, meaning that three relationships may exist, e.g., a and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship. Further, the term "plurality" herein means two or more than two. In addition, the term "at least one" herein means any one of a plurality or any combination of at least two of a plurality, for example, including at least one of A, B, C, and may mean including any one or more elements selected from the group consisting of A, B and C.
At present, 5G communication technology is more and more popular, and the most difference between 5G communication and previous 4G communication is that the communication frequency of 5G communication is increased to 28GHz, i.e. millimeter wave frequency band. The communication function in the millimeter wave band is different from that of LTE (Long Term Evolution) of the previous 4G communication, and therefore, 5G communication is greatly different in product characteristics and product functions. For example, in 4GLTE communication, a communication device such as an indoor router or a mobile phone can directly receive a communication signal from an outdoor base station. However, in the 5G communication process, because the wavelength of the millimeter wave signal is short and the transmission loss is large, the communication signal is almost absent when the millimeter wave signal passes through a wall body and enters a room.
In view of the above problems, the present application proposes a new system architecture. Referring specifically to fig. 1, fig. 1 is a schematic diagram of a 5G indoor coverage solution provided in the present application. As shown in fig. 1, the system architecture for 5G communication proposed in the present application is to connect a 5G signal, i.e., a millimeter wave signal, with a Small cell (low power radio access node) and then transmit the millimeter wave signal to the indoor through a wireless signal wall-through scheme.
Aiming at the system architecture, the application also provides a communication transmission device which can effectively realize the wireless signal wall-through scheme. Referring to fig. 2 in detail, fig. 2 is a schematic structural diagram of an embodiment of a communication transmission apparatus provided in the present application.
The communication transmission device 100 of the present application includes a first communication transmission assembly 11 and a second communication transmission assembly 12, wherein the first communication transmission assembly 11 and the second communication transmission assembly 12 are respectively disposed on two sides of a wall, it can be understood that the first communication transmission assembly 11 is disposed on an outdoor side of the wall, and the second communication transmission assembly 12 is disposed on an indoor side of the wall, so that an outdoor communication signal is transmitted to an indoor space through the first communication transmission assembly 11 and the second communication transmission assembly 12 having a wireless communication capability.
In the present application, the first communication transmission component 11 is provided with a first wireless signal module 111 for wireless communication, and the second communication transmission component 12 is provided with a second wireless signal module 121 for wireless communication. The first wireless signal module 111 is used for converting the millimeter wave signal and the intermediate frequency signal, and the second wireless signal module 121 is used for converting the intermediate frequency signal and the digital signal.
Specifically, please refer to fig. 3, in which fig. 3 is a schematic structural diagram of an embodiment of a wireless signal module according to the present disclosure. The first wireless signal module 111 includes a radio frequency module 21, and the second wireless signal 121 includes a baseband module 22 and a radio frequency chip 23. The rf module 21 is disposed on one side of the wall, and the baseband module 22 and the rf chip 23 are disposed on the other side of the wall opposite to the rf module 21.
The rf module 21 is used for switching a millimeter wave high frequency signal and an intermediate frequency signal, the rf chip 23 is used for switching an intermediate frequency signal and an IQ signal, and the baseband module 22 is used for switching an IQ signal and a digital signal, wherein the digital signal includes but is not limited to: HDMI video signals, ethernet signals, USB signals, and fiber optic signals, among others.
Further, in the embodiment of the present disclosure, the rf module 21 and/or the rf chip 23 switch a signal that needs to pass through the wall into an intermediate frequency signal, and the loss of the signal caused when the signal passes through the wall is reduced by using the characteristic that the intermediate frequency signal is relatively easy to penetrate through the wall.
Further, the first wireless signal module 111 further includes a first repeater 24, and the second wireless signal module 121 further includes a second repeater 25. The first repeater 24 is connected to the rf module 21, the second repeater 25 is connected to the rf chip 23, and both the first repeater 24 and the second repeater 25 are configured to amplify the intermediate frequency signal.
In one case, the rf module 21 switches the millimeter wave high frequency signal to an intermediate frequency signal, and the first repeater 24 amplifies the intermediate frequency signal by internal components and transmits the amplified signal to the other side of the wall. In another case, the first repeater 24 receives the intermediate frequency signal sent from the other side of the wall, amplifies and reinforces the signal through the internal components, and then transmits the amplified and reinforced signal to the radio frequency module 21, where the radio frequency module 21 is configured to switch the intermediate frequency signal to a millimeter wave high frequency signal.
In one case, the second repeater 25 receives the intermediate frequency signal sent from the other side of the wall, amplifies and reinforces the signal through the internal components, and then sends the amplified and reinforced signal to the rf chip 23, the rf chip 23 outputs an IQ signal to the baseband module 22 after signal processing, and the baseband module 22 is configured to switch the IQ signal into a digital signal. In another case, the baseband module 22 is configured to switch the digital signal to an IQ signal, convert the IQ signal to an intermediate frequency signal by the rf chip 23, and amplify the intermediate frequency signal by the second repeater 25 and transmit the amplified intermediate frequency signal to the other side of the wall.
Further, the first communication transmission assembly 11 and the second communication transmission assembly 12 are each provided with a suction portion 13, and the suction portions 13 are used for providing suction force to fix the first communication transmission assembly 11 and the second communication transmission assembly 12 on the wall.
The suction portion 13 includes a suction mechanism 131 and an opening structure 132, wherein the suction mechanism 131 vacuums the opening structure 132. The opening structure 132 is used for contacting with a wall, and when the negative pressure state is reached, the opening structure 132 respectively adsorbs the first communication transmission assembly 11 and the second communication transmission assembly 12 onto the wall.
Specifically, the opening structures 132 are respectively disposed on a first surface of the first communication transmission assembly 11 and a second surface of the second communication transmission assembly 12, where the first surface and the second surface are two opposite surfaces of the wall body to which the first communication transmission assembly 11 and the second communication transmission assembly 12 are fixed, respectively.
Wherein the first surface comprises a first area and a second area, and the intermediate frequency signal is sent to the second communication transmission component 12 via the first area; the second surface includes a third area via which the second communication transmission member 12 receives the intermediate frequency signal and a fourth area. In order to obtain a better communication effect, the first area and the third area in the application are at least partially overlapped in the projection direction of the wall, so that the path of a signal passing through the wall is ensured to be as short as possible, and the loss of the wall to the signal is reduced.
The opening structure 132 is disposed on the second area and the fourth area, and the opening structure 132 may be specifically made of a flexible and extensible and contractible material, and by using a non-metallic material, a turbine effect generated inside the communication transmission device 100 can be effectively avoided, so as to affect the communication effect. The opening structure 132 may be designed as an inverted cone-like structure without a vertex angle, and in other embodiments, the opening structure 132 may also be designed as other feasible structures, which will not be described in detail herein. The inverted cone-like structure is advantageous for increasing the contact area between the opening structure 132 and the wall, and is advantageous for improving the stability of the communication transmission device 100 during fixing.
Further, the first communication transmission component 11 is further provided with a first wireless charging module 112, and the second communication transmission component 12 is further provided with a second wireless charging module 122; the first wireless charging module 112 is disposed on the first area, and the second wireless charging module 122 is disposed on the third area. The second communication transmission assembly 12 is directly electrically connected to the indoor power supply, and the second wireless charging module 122 provides electric energy to the second wireless signal module 121 on one hand and transmits electric energy to the first wireless charging module 112 on the other hand; the first wireless charging module 112 is used for providing power to the first wireless signal module 111. It should be noted that the second wireless charging module 122 may transmit the electric energy to the first wireless charging module 112 by using an electromagnetic induction type or other wireless charging technologies.
Taking the first surface as an example, a first area of the first surface is used for disposing the first wireless signal module 111 and the first wireless charging module 112, and a second area of the second surface is used for disposing the opening structure 132. The present application provides various methods of dividing a first area and a second area on a first surface, including but not limited to the following division: (1) the first area and the second area are vertically divided; (2) the first area and the second area are divided horizontally; (3) the first region is disposed to surround the second region.
The division manner in which the first area surrounds the second area is illustrated in fig. 2, and specifically, the communication transmission device 100 of fig. 2 arranges the opening structure 132 at the center of the first surface of the first communication transmission component 11 and the center of the second surface of the second communication transmission component 12, respectively. The opening structures 132 are respectively disposed at the center positions of the first surface and the second surface, so that sufficiently stable suction force and supporting force can be provided for the first communication transmission component 11 and the second communication transmission component 12, and the stability of the communication transmission device 100 is improved.
Wherein, the air extracting mechanism 131 in the adsorption part 13 specifically includes a vacuum pump and an air duct (not shown in the figure), and the opening structure 132 is provided with an air extracting hole (not shown in the figure); the vacuum pump is connected with the air suction hole through an air duct and used for pumping out air in the closed space formed by the opening structure 132 and the wall body.
Further, an air pressure sensor (not shown in the figure) is further disposed in the closed space formed by the opening structure 132 and the wall body, and the air pressure sensor is electrically connected to the vacuum pump; the air pressure sensor is used for feeding back air pressure information in a closed space formed by the opening structure and the wall body to the vacuum pump so that the vacuum pump can adjust output power according to the air pressure information. The air pressure sensor can monitor the vacuum degree of the closed space formed by the opening structure 132 and the wall, and when the vacuum degree in the closed space is higher than the preset vacuum degree, the vacuum environment in the closed space is enough to fix the first communication transmission assembly 11 and the second communication transmission assembly 12 on the wall, and at this time, the vacuum pump only needs to maintain the vacuum environment in the closed space. When the vacuum degree in the closed space is lower than the preset vacuum degree, it is indicated that the vacuum environment in the closed space becomes poor, the output power needs to be increased by the vacuum pump, and the air in the closed space is pumped away, so that the vacuum environment with the preset vacuum degree is reached, and the stability of the communication transmission device 100 is favorably ensured.
The above description is only for the purpose of illustrating embodiments of the present invention and is not intended to limit the scope of the present invention, and all modifications, equivalents, and equivalent arrangements that can be made by using the contents of the specification and drawings or applied directly or indirectly to other related technical fields are also within the scope of the present invention.

Claims (10)

1. A communication transmission apparatus, characterized in that the communication transmission apparatus comprises:
the first communication transmission assembly is provided with a first wireless signal module;
the second communication transmission component is provided with a second wireless signal module;
the first communication transmission assembly and the second communication transmission assembly are respectively provided with an adsorption part for providing adsorption force so that the first communication transmission assembly and the second communication transmission assembly are fixed on a wall body;
the first wireless signal module is used for converting millimeter wave signals and intermediate frequency signals, and the second wireless signal module is used for converting the intermediate frequency signals and digital signals.
2. The communication transmission apparatus according to claim 1,
the adsorption part comprises an air exhaust mechanism and an opening structure, the air exhaust mechanism is used for vacuumizing the opening structure, the opening structure is used for being in contact with the wall body, and when the negative pressure state is achieved, the opening structure is used for respectively adsorbing the first communication transmission assembly and the second communication transmission assembly onto the wall body.
3. The communication transmission apparatus according to claim 2,
the opening structures are respectively arranged on a first surface of the first communication transmission assembly and a second surface of the second communication transmission assembly, and the first surface and the second surface are respectively two surfaces of the first communication transmission assembly and the second communication transmission assembly which are fixed on the wall body and opposite to each other.
4. The communication transport apparatus of claim 3, wherein the first surface includes a first area and a second area, the intermediate frequency signal being transmitted to the second communication transport component via the first area;
the second surface includes a third area and a fourth area, the second communication transmission assembly receives the intermediate frequency signal via the third area, and the opening structures are respectively disposed on the second area and the fourth area.
5. The communication transmission apparatus according to claim 4,
the first region of the first surface is disposed around the second region, and the third region of the second surface is disposed around the fourth region.
6. The communication transmission apparatus according to claim 4,
the opening structure is a flexible extensible and contractible material, and the opening structure is an inverted cone-like structure without a vertex angle.
7. The communication transmission apparatus according to claim 4,
the first communication transmission assembly is also provided with a first wireless charging module, and the second communication transmission assembly is also provided with a second wireless charging module; the first wireless charging module is arranged on the first area, and the second wireless charging module is arranged on the third area;
the second communication transmission assembly is electrically connected with the power supply, the second wireless charging module provides electric energy for the second wireless signal module and transmits the electric energy to the first wireless charging module, and the first wireless charging module is used for providing the electric energy for the first wireless signal module.
8. The communication transmission apparatus according to claim 4,
the air extraction structure comprises a vacuum pump and an air guide pipe, and an air extraction hole is formed in the opening structure; the vacuum pump is connected with the air exhaust hole through the air guide pipe and used for exhausting air in a closed space formed by the opening structure and the wall body.
9. The communication transmission apparatus according to claim 8,
an air pressure sensor is also arranged in a closed space formed by the opening structure and the wall body, and the air pressure sensor is electrically connected with the vacuum pump;
the air pressure sensor is used for feeding back air pressure information in a closed space formed by the opening structure and the wall body to the vacuum pump, so that the vacuum pump can adjust output power according to the air pressure information.
10. The communication transmission apparatus according to claim 1, wherein the first wireless signal module comprises a radio frequency module, and the second wireless signal module comprises a baseband module and a radio frequency chip;
the radio frequency module is used for converting the millimeter wave signal and the intermediate frequency signal, the radio frequency module is used for converting the intermediate frequency signal and an IQ signal, the baseband module is used for converting the IQ signal and a digital signal, and the radio frequency module and/or the radio frequency chip convert a signal which needs to pass through the wall body into the intermediate frequency signal;
wherein the digital signal comprises: HDMI video signals, USB signals, ethernet signals, optical fiber signals.
CN202010635581.1A 2020-07-03 2020-07-03 Communication transmission device Pending CN111953357A (en)

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Application Number Priority Date Filing Date Title
CN202010635581.1A CN111953357A (en) 2020-07-03 2020-07-03 Communication transmission device

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Application Number Priority Date Filing Date Title
CN202010635581.1A CN111953357A (en) 2020-07-03 2020-07-03 Communication transmission device

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CN111953357A true CN111953357A (en) 2020-11-17

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Citations (9)

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Publication number Priority date Publication date Assignee Title
CN102966038A (en) * 2012-11-23 2013-03-13 南京理工大学 Bridge detecting robot based on negative-pressure absorption
US20180269957A1 (en) * 2017-03-18 2018-09-20 AirVine Scientific, Inc. Millimeter wave communication system featuring adjustable support
CN108577655A (en) * 2018-05-03 2018-09-28 湖州优创科技有限公司 A kind of window wiping robot flexibly turned to
CN109040388A (en) * 2018-08-20 2018-12-18 深圳市蓝禾技术有限公司 Electrokinetic adsorption bracket
CN110063683A (en) * 2019-05-12 2019-07-30 孟亚星 A kind of suction type double-sided glass cleaning mechanism
CN110521277A (en) * 2017-03-22 2019-11-29 尼克根合伙Ip有限责任公司 The regeneration and forwarding of millimeter wave for building penetration
CN209893062U (en) * 2019-03-05 2020-01-03 中控智慧科技股份有限公司 Mounting structure of wall hanging equipment
CN110649956A (en) * 2019-09-24 2020-01-03 王戗戗 Repeater
CN110661562A (en) * 2018-06-30 2020-01-07 上海华为技术有限公司 Transmission system and transmission device for millimeter wave signals

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102966038A (en) * 2012-11-23 2013-03-13 南京理工大学 Bridge detecting robot based on negative-pressure absorption
US20180269957A1 (en) * 2017-03-18 2018-09-20 AirVine Scientific, Inc. Millimeter wave communication system featuring adjustable support
CN110521277A (en) * 2017-03-22 2019-11-29 尼克根合伙Ip有限责任公司 The regeneration and forwarding of millimeter wave for building penetration
CN108577655A (en) * 2018-05-03 2018-09-28 湖州优创科技有限公司 A kind of window wiping robot flexibly turned to
CN110661562A (en) * 2018-06-30 2020-01-07 上海华为技术有限公司 Transmission system and transmission device for millimeter wave signals
CN109040388A (en) * 2018-08-20 2018-12-18 深圳市蓝禾技术有限公司 Electrokinetic adsorption bracket
CN209893062U (en) * 2019-03-05 2020-01-03 中控智慧科技股份有限公司 Mounting structure of wall hanging equipment
CN110063683A (en) * 2019-05-12 2019-07-30 孟亚星 A kind of suction type double-sided glass cleaning mechanism
CN110649956A (en) * 2019-09-24 2020-01-03 王戗戗 Repeater

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