Patents
Literature
Patsnap Eureka AI that helps you search prior art, draft patents, and assess FTO risks, powered by patent and scientific literature data.

452results about "Disturbance protection" patented technology

Method and system for addressing interference by configuring or adapting antenna structures

Aspects of the subject disclosure may include, for example, identifying one or more radiating elements of an antenna system that are to be adjusted based on interference determined to affect an operation of the antenna system, and altering one or more properties of the one or more radiating elements to effect polarization adjusting such that an impact of the interference on the antenna system is minimized. Other embodiments are disclosed.
Owner:ISCO INTERNATIONAL LLC

Method and system for mitigating interference by displacing antenna structures

Aspects of the subject disclosure may include, for example, obtaining data regarding interference detected in a received communication signal, and performing phase adjusting for one or more radiating elements of an antenna system such that an impact of the interference on the antenna system is minimized. Other embodiments are disclosed.
Owner:ISCO INTERNATIONAL LLC

Method and system for mitigating interference in the near field

Aspects of the subject disclosure may include, for example, receiving, via an antenna, a communication signal generated by a communication device, and detecting interference in the communication signal, wherein the interference is generated by one or more interference sources, wherein the interference is detected by monitoring a near field region of the antenna, an intermediate field region of the antenna, a far field region of the antenna, or any combinations thereof, wherein the monitoring excludes monitoring only the far field region of the antenna. Other embodiments are disclosed.
Owner:ISCO INTERNATIONAL LLC

Multi-level intelligent overheating protection system and method based on gallium nitride module antenna

The invention relates to the technical field of antennas, in particular to a multi-level intelligent overheating protection system and method based on a gallium nitride module antenna. According to the method, a thermal load optimal migration path is analyzed based on a virtual thermal capacity network model, and an input impedance matching network of a target unit is synchronously tuned according to the thermal load optimal migration path to compensate beam phase distortion caused by thermal migration; and according to the boundary constraint condition of the real-time threat scene feature injection virtual thermal capacity network model, dynamically solving a game equilibrium solution of a thermal load migration path and a beam parameter tuning amount, and generating a thermal-radio frequency combined control instruction set. According to the method, full-process closed-loop control from thermal inertia characteristic analysis, thermal network modeling to thermal-radio frequency collaborative optimization is realized, so that the gallium nitride antenna system can intelligently plan an optimal thermal migration path and compensate thermally induced performance distortion in real time in a complex thermal environment and a threat scene, and finally dual optimization of heat dissipation efficiency and radio frequency indexes is achieved.
Owner:SHENZHEN YANUOXUN TECH CO LTD

Linear polarization scattering reconfigurable array antenna

The invention discloses a linear polarization scattering reconfigurable array antenna, which belongs to the technical field of antenna manufacturing and comprises an antenna unit, an extension socket, a transmission type phase shifter and an inductor. The antenna unit comprises a radiation patch, a first dielectric substrate, a metal via hole, a metal patch, a second dielectric substrate, a perforated metal floor, a third dielectric substrate, a feed metal column and a radio frequency coaxial connector, the radio frequency coaxial connector is connected with the radiation patch through the feed metal column, and a variable capacitance diode and a capacitor are arranged on the transmission type phase shifter. The transmission type phase shifter is connected with the radiation patch through the feed metal column, the variable capacitance diode is connected with the punching metal floor, the bottom of the third dielectric substrate is provided with a direct current bias line, the direct current bias line is connected with the transmission type phase shifter through the inductor, and the transmission type phase shifter is connected with the radiation patch through the feed metal column. According to the invention, flexible regulation and control of antenna scattering beams can be realized, and the antenna has the characteristics of flexible control, fast response speed and high radiation efficiency.
Owner:CHENGDU RDW TECH CO LTD +1

Antenna, antenna system and vehicle

The present disclosure provides an antenna, an antenna system and an automobile, belonging to the field of wireless communication technologies. The antenna includes a main antenna, a parasitic antenna and a main board; the main antenna and the parasitic antenna are both located on the surface of the main board, and the plane where the main antenna is located is parallel to the plane where the parasitic antenna is located and the positions are opposite; the feeding point of the main antenna is connected to the feeding transmission line of the main board, and the parasitic antenna is connected to the second grounding end of the main board; wherein, the difference between the resonant frequency point of the main antenna and the resonant frequency point of the parasitic antenna is less than a target threshold. When this antenna is applied in an automobile as a communication antenna of the automobile, such as a 4G communication antenna or a 5G communication antenna, it can achieve 4G or 5G wide-bandwidth coverage, such as full-bandwidth coverage. In addition, this antenna can also improve the out-of-band suppression ratio and enhance the anti-foreign frequency interference characteristics.
Owner:YINWANG INTELLIGENT TECHNOLOGIES CO LTD

Antenna structure, electronic device, and wireless network system

An antenna structure, an electronic device, and a wireless network system are provided, and relate to the field of antenna technologies. A patch antenna array includes four patch antennas. The four patch antennas are arranged in two rows and two columns. One of the feeding structures is included between two of the patch antennas in each row. One of the feeding structures is included between two of the patch antennas in each column. The feeding structure located between the two patch antennas in each column is connected to the first feeding port, so that the four patch antennas all generate polarization in a first direction. The feeding structure located between the two patch antennas in each row is connected to the second feeding port, so that the four patch antennas all generate polarization in a second direction.
Owner:HONOR DEVICE CO LTD +1

Broadband wide-angle scanning array antenna based on metasurface lens

The invention discloses a broadband wide-angle scanning array antenna based on a metasurface lens, belongs to the technical field of phased-array antennas, solves the problem of how to improve the scanning range and gain of the phased-array antennae, and is characterized in that the metasurface lens with phase gradient is loaded above the phased-array antenna on the basis of not changing the structure of the original phased-array antenna. The beam scanning range of the phased-array antenna is expanded, and the performance such as gain is improved; according to the invention, an original phased-array antenna does not need to be modified and redesigned, additional active devices do not need to be added, new components do not need to be introduced into an original system, the system cost is effectively reduced, the system size is reduced, and the antenna is suitable for scenes, such as unmanned aerial vehicles and low-altitude aircrafts, which have strict requirements on the size and the weight.
Owner:CHINA ELECTRONIC TECH GRP CORP NO 38 RES INST

Electronic equipment

The embodiment of the invention provides electronic equipment. The electronic equipment comprises a first antenna and a second antenna. The first antenna takes the conductive part of the frame of the first shell as a first radiator and a parasitic branch knot. And the second antenna takes the conductive part of the frame of the second shell as a second radiator, and the second radiator and the parasitic branch knot are arranged adjacently. The electronic device can be a foldable electronic device, when the electronic device is in a folded state, the first antenna and the second antenna have good isolation, and the first antenna and the second antenna can work at the same time to improve the communication performance of the electronic device.
Owner:HUAWEI TECH CO LTD

Zero-constraint splicing method for mesh antenna metal net

The invention discloses a mesh antenna metal net zero-constraint splicing method. A metal net is tiled and hung on a working tension applying device, and working tension is applied to the metal net in the transverse direction and the longitudinal direction; in the working tension state, tension control belts are sewn on the edges of the two sides of the metal net in the length direction; lapping two metal nets which need to be spliced and are sewn with the same tension control belts, wherein the sections of the lapping positions are lapped according to the sequence of belt-net-net-belt; sewing two layers of metal nets along the two sides of the tension control belt by adopting composite material sewing lines; and repeating the steps, and sewing all the metal meshes required by the whole antenna reflecting surface in sequence. According to the method, the metal net is spliced by adopting an overlock stitching method, the tension control belt can be detached after splicing is completed, the formed splicing seam is of a net-net structure, the thickness is only 0.07-0.08 mm, the elasticity keeps the original elasticity of the metal net, the net surface tension is more uniform, and the risk that the antenna expansion resistance is increased due to micro shrinkage of the tension control belt at high temperature is effectively eliminated.
Owner:XIAN SPACE STAR TECH IND GRP

Electronic device for performing impedance matching of antenna, and operation method of electronic device

An electronic device electronic device is provided. The electronic device includes a first antenna, a second antenna, memory, comprising one or more storage media, storing instructions, and at least one communication processor communicatively coupled to the first antenna, the second antenna, and the memory, wherein the instructions, when executed by the at least one communication processor individually or collectively, cause the electronic device to during an operation in a mode in which data is transmitted to a cellular network via the first antenna and the second antenna, identify a number of uplink layers allocated by the cellular network to the electronic device, in case that the number of uplink layers allocated to the electronic device during a specified time satisfies a specified condition, change an operation mode related to impedance matching of at least one of the first antenna and the second antenna from a first mode for improving performance of at least one antenna to a second mode for reducing consumption of an amplifier electrically connected to the at least one antenna, and perform the impedance matching of the at least one antenna in the second mode.
Owner:SAMSUNG ELECTRONICS CO LTD

Millimeter wave end-fire horizontal polarization broadband wide-angle scanning phased antenna array and equipment

The invention discloses a millimeter wave end-fire horizontal polarization broadband wide-angle scanning phased antenna array and equipment. The array comprises a lower-layer metal surface, a middle metal surface, an upper-layer metal surface, metal through holes, metal blind holes and a feed port, a radiator of the antenna array is composed of rectangular annular patches which are arranged at the front ends of an upper-layer metal surface and a lower-layer metal surface and are provided with concave U-shaped structures, and opening gaps which are etched at the central positions of the front ends of the upper-layer metal surface and the lower-layer metal surface of the substrate integrated waveguide; a plurality of antenna units in the antenna array feed independently through a plurality of feed ports and regulate and control an excitation phase; the metal blind hole is connected with the substrate integrated coaxial line; the substrate integrated coaxial line is composed of a substrate integrated waveguide and a transmission line located on a middle metal face. The substrate integrated waveguide is composed of two layers of dielectric substrates, a bonding layer, an upper-layer metal surface, a lower-layer metal surface and metal through holes. According to the invention, the broadband and wide-angle phase control scanning performance of the array beam in the plane where the array is located is realized.
Owner:SOUTH CHINA UNIV OF TECH

Common-aperture dual-polarization tight coupling array antenna capable of wide-angle scanning

The invention belongs to the technical field of antennas, and relates to a common-caliber dual-polarization tight coupling array antenna capable of wide-angle scanning, which comprises a low-frequency antenna array surface, a low-frequency vertical branch knot, a low-frequency feed balun, a high-frequency antenna array surface, a low-frequency feed network and a coaxial connector. According to the invention, a traditional ultra-wideband tight coupling array antenna is decomposed into two antennas with small bandwidths, and loading of resistive materials is avoided through common-caliber configuration. Wherein an upper-layer low-frequency antenna unit is divided into a plurality of sub-units, electromagnetic transparency of a lower-layer high-frequency antenna is realized by adopting a winding line design, mutual interference of high and low frequencies is further inhibited by loading a vertical branch knot, and the fractal low-frequency sub-units are synthesized into a large unit through a power divider. According to the dual-polarization ultra-wideband antenna, the average efficiency reaches 85% in the working frequency bands of 2-6GHz and 7-18GHz, the active standing-wave ratio is smaller than 4 in the scanning range of + / -60 degrees, and the problem that in a traditional design, ultra-wideband, high efficiency, wide-angle scanning and dual polarization cannot be achieved at the same time is solved.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA

Full-sea-depth antenna packaging assembly and packaging method thereof

The invention discloses an underwater communication equipment technology, and aims to provide a full-sea-depth antenna packaging assembly and a packaging method thereof.The full-sea-depth antenna packaging assembly is characterized in that the full-sea-depth antenna packaging assembly comprises a cabin penetrating part, an antenna unit, an antenna protection cover, a vulcanization coating layer and a sealing ring, and the full-sea-depth antenna packaging assembly is used for achieving stable transmission of signals in a deep sea environment; the antenna unit is used for transmitting and receiving electromagnetic wave signals; a conductive channel is arranged in the cabin penetrating piece and used for being electrically connected with the antenna unit so that electric signals inside and outside the cabin can penetrate through the cabin. The whole antenna protection cover is cylindrical, the end part of the antenna protection cover is in transition connection to form a hemispherical shape, and an antenna placement area is formed in the antenna protection cover; the vulcanized coating layer is coated on the peripheral side of the joint of the antenna protection cover and the cabin penetrating piece; the sealing ring is arranged between the antenna protection cover and the cabin penetrating piece and is of a metal-rubber composite structure. The invention is suitable for the technical field of underwater communication equipment.
Owner:ZHEJIANG LANSUO MARINE TECH CO LTD +1

High-gain low-sidelobe antenna

The invention relates to a high-gain low-sidelobe antenna. The power divider comprises a first power division torsion network which comprises a channel arranged along a first direction and two sub-channels divided towards two sides of a second direction along the channel; the plurality of coupling grooves are distributed on the two sub-channels along a second direction; the number of the second power division torsion networks corresponds to the number of the coupling grooves, each second power division torsion network is arranged on one side of the corresponding coupling groove along a third direction, and each second power division torsion network extends along the first direction; the coupling slot is used for receiving a signal transmitted by the corresponding coupling slot and transmitting the signal to two sides of the first direction; and the number of the slot radiation units corresponds to that of the second power division torsion networks, and each slot radiation unit comprises a plurality of slot radiation slots distributed along the first direction. The antenna is compact in structure, and the sidelobe level is effectively reduced while high gain is met.
Owner:WEIFU INTELLIGENT SENSE (WUXI) TECH CO LTD

An electronic device

This application provides an electronic device. The electronic device includes a back cover, a camera bracket, and an NFC antenna. The camera bracket is disposed on the back cover and includes a first surface and a second surface disposed opposite to each other. The first surface of the camera bracket faces outwards from the electronic device. The camera bracket has a first light-transmitting hole for facing a first flash or a first camera. The NFC antenna is disposed on the first surface of the camera bracket. The first orthographic projection of the NFC antenna onto the first surface of the camera bracket falls within the first surface of the camera bracket and does not overlap with the first light-transmitting hole, so that the NFC antenna avoids the first light-transmitting hole. This application provides a solution that enables the NFC antenna to maintain good radiation performance even in scenarios where the number of cameras is increasing and the camera bracket is becoming larger.
Owner:HONOR DEVICE CO LTD

Layer structure of radome body and manufacturing method

The invention belongs to the technical field of composite materials and radomes, and particularly relates to a layer structure of a radome body and a manufacturing method. The skin comprises a first skin layer, an interlayer, a second skin layer and a polyvinyl fluoride film layer which are sequentially arranged from top to bottom. Through collaborative design of a micro-nano composite structure and a low-surface-energy material, a self-cleaning surface skin layer with super-hydrophobicity, high wave transmission and weather resistance is constructed. Compared with a traditional fluorocarbon coating, the wave transmission rate is 60-70% and is improved by more than 25%, the signal transmission loss is remarkably reduced, and the harsh requirement for the wave transmission performance of the antenna housing is met. The cleaning cost of a traditional antenna housing can be saved by more than 80%, especially for high-altitude and complex-structure antenna housings, high-altitude operation or special equipment is not needed, and the maintenance safety risk is reduced. The replacement frequency of the radome caused by aging and abrasion of the coating can be reduced, and the overall life cycle cost of equipment is reduced.
Owner:SHAANXI TIANYI ANTENNA

Vehicle antenna assembly, glass assembly and vehicle

A vehicle antenna assembly includes an antenna base film and a transparent antenna unit. The transparent antenna unit is attached to one side of the antenna base film, and the transparent antenna unit includes: a first radiation unit, which is configured to receive and transmit a radio frequency signal; and a second radiation unit, which is arranged spaced apart from the first radiation unit. The second radiation unit is grounded and is configured to tune the resonant frequency of the first radiation unit, such that the first radiation unit meets an impedance matching requirement.
Owner:QUECTEL WIRELESS SOLUTIONS CO LTD

High-frequency chip arrangement, sensor and manufacturing process

[0060] The invention relates to a high-frequency chip arrangement 100. The high-frequency chip arrangement comprises a high-frequency chip 112 configured to radiate and receive high-frequency waves, and a first housing 114, 115 having a cavity, consisting of a housing cover 115 and a substrate 114, wherein the first housing surrounds the high-frequency chip when the housing cover is attached to the substrate. The high-frequency chip is arranged on a top surface of the substrate such that it radiates the high-frequency waves away from the substrate. The substrate, the high-frequency chip, and the first housing form a module 110.The high-frequency chip arrangement has a second housing 120 that surrounds at least the module, wherein an intermediate space 121 between the module and the second housing is filled with a potting compound 104, so that the module is completely surrounded by the potting compound and the high-frequency waves pass through the first housing, the potting compound, and the second housing.
Owner:VEGA GRIESHABER GMBH & CO

Method and system for mitigating interference in the near field

Aspects of the subject disclosure may include, for example, receiving, via an antenna, a communication signal generated by a communication device, and detecting interference in the communication signal, wherein the interference is generated by one or more interference sources, wherein the interference is detected by monitoring a near field region of the antenna, an intermediate field region of the antenna, a far field region of the antenna, or any combinations thereof, wherein the monitoring excludes monitoring only the far field region of the antenna. Other embodiments are disclosed.
Owner:ISCO INTERNATIONAL LLC

Antenna assembly for vehicle, and glass assembly and vehicle

Disclosed in the present application are an antenna assembly for a vehicle, and a glass assembly and a vehicle. The antenna assembly for a vehicle comprises an antenna base film and a transparent antenna unit. The transparent antenna unit is attached to one side of the antenna base film, and the transparent antenna unit comprises: a first radiation unit, which is used for receiving and transmitting a radio frequency signal; and a second radiation unit, which is arranged spaced apart from the first radiation unit, wherein the second radiation unit is grounded and is used for tuning the resonant frequency of the first radiation unit, such that the resonant frequency meets an impedance matching requirement. The antenna assembly for a vehicle in the present solution can be attached to glass and can also be arranged in a glass interlayer. An antenna design area is large, and the physical distance between antennas is large, such that the problem of the isolation degree between the antennas can be fundamentally solved. In addition, the antennas are designed on vehicle glass, such that the influence of shielding of metal of a vehicle body on the performance of the antennas can be effectively avoided, thereby greatly improving the radiation efficiency of the antennas.
Owner:QUECTEL WIRELESS SOLUTIONS CO LTD

Sprayable sensor integrated with millimeter wave radar and use method

PendingCN120334905AProgramme controlWaveguide hornsBroadside radiationRadar detection
The invention discloses a throwing sensor integrated with a millimeter-wave radar and a use method. The sensor comprises a shell, a millimeter-wave radar detection module and a printed circuit board, wherein the millimeter-wave radar detection module and the printed circuit board are located in the shell; wherein the millimeter wave radar detection module comprises an antenna, a radiation patch, an RDL layer and a control chip; a radiation window is arranged on the printed circuit board; the antenna is located on one side face of the printed circuit board, and the antenna and the printed circuit board are connected in an embedded mode through a first metal through hole. The radiation patch, the RDL layer and the control chip are positioned on the other side surface of the printed circuit board; the radiation patch and the control chip are located on the two side faces of the RDL layer respectively, and the radiation patch is further located in the radiation window. The RDL layer is provided with a first signal window, and the control chip is connected with the radiation patch through the first signal window. The control chip feeds power to the antenna radiation structure, so that the transmission loss is reduced, and the transmission efficiency is improved.
Owner:ANHUI UNIV

System with lossy material for reducing passive intermodulation

A wireless communication system includes a transmitter, a plurality of passive substantially linear medium portions including one or more first portions and a second portion, one or more passive substantially nonlinear medium portions disposed proximate the substantially linear medium portions, and for each first portion, a dielectrically lossy or magnetically lossy first material disposed on the first portion. When the transmitter transmits first and second radio waves, the substantially linear and nonlinear medium portions receive the first and second radio waves and generate first and second signals propagating therein, where at least one intermodulation signal is generated in the one or more substantially nonlinear medium portions from the first and second signals, and the one or more first materials reduces the generation of the at least one intermodulation signal by at least 2 dB.
Owner:3M INNOVATIVE PROPERTIES CO

Dielectric lens and dielectric lens antenna

The invention discloses a dielectric lens and a dielectric lens antenna. The dielectric lens comprises B lens units, the B lens units are distributed in an array to form a lens array which is square on the whole, the middle part of the lens array is circular, the lens units distributed at the edge position of the array are higher than the lens units distributed at the circular position in the middle of the array, and the middle position of the lens unit array forms a circular concave cavity. The whole lens unit is a cuboid and comprises two impedance matching layers and a square dielectric cylinder, and the two square end faces of the square dielectric cylinder are connected with the impedance matching layers respectively. And four cube-shaped through holes are symmetrically formed in the middle of the impedance matching layer. The dielectric lens antenna comprises the dielectric lens and a feed source antenna, and the feed source antenna is arranged on one side of the dielectric lens and located at the position of an extension line of the geometric center of the dielectric lens. The dielectric lens provided by the invention has relatively high transmissivity, and the dielectric lens antenna has more excellent gain performance, broadband coverage and relatively low production cost.
Owner:CHONGQING UNIV OF POSTS & TELECOMM +1

Antenna structure, electronic device and wireless network system

An antenna structure, an electronic device, and a wireless network system are provided, and relate to the field of antenna technologies. A dielectric plate and a metal bottom plate of the antenna structure are spaced apart at a first preset distance. A first feeding port and a patch antenna array are located on a first surface of the dielectric plate, and a second feeding port is located on a second surface of the dielectric plate. The second surface is opposite the first surface. The patch antenna array includes four patch antennas. The four patch antennas are arranged in two rows and two columns. One of the feeding structures is included between two of the patch antennas in each row. One of the feeding structures is included between two of the patch antennas in each column. The feeding structure located between the two patch antennas in each column is connected to the first feeding port, so that the four patch antennas all generate polarization in a first direction. The feeding structure located between the two patch antennas in each row is connected to the second feeding port, so that the four patch antennas all generate polarization in a second direction. The first direction is orthogonal to the second direction. The antenna structure is simple in structure and has higher directional gain.
Owner:HONOR DEVICE CO LTD +1

Film antenna and solar wing integrated structure

The invention relates to a thin film antenna and solar wing integrated structure. A thermal control coating is adopted on the outer surface of a thin film antenna layer to realize temperature control on the outer side of an antenna; heat flow diffusion and temperature self-adjustment of a high heating device in the antenna are realized by adopting the high-heat-conductivity flexible patch and the energy storage patch; the mutual heat radiation influence between the thin film antenna layer and the solar cell layer is reduced by adopting a plurality of thermal control heat insulation layers; and the temperature influence of the solar cell layer on the structural frame and the thin film antenna layer is further reduced through the low-emissivity thin film layer and the heat insulation connecting device. Under different sun irradiation conditions, the film antenna ensures that internal devices work in a preset temperature range; the problems of local heating and heat dissipation of high-heating devices in dot matrix distribution in the thin film antenna are solved. When the solar cell layer works, the thermal radiation influence on the thin film antenna caused by temperature rise is reduced, and finally the thermal compatibility design of the thin film antenna and the solar wing is achieved.
Owner:XIAN INSTITUE OF SPACE RADIO TECH

Wearable electronic devices

The present application provides a wearable electronic device, which includes a housing and a circuit board assembly. The circuit board assembly is located inside the housing and is fixed relative to the housing. The housing includes a carbon fiber material, and the housing has an inner surface. The housing includes a conductive layer provided on the inner surface, and the conductive layer electrically connects the carbon fiber material dispersed in the housing. The housing and the circuit board assembly are electrically connected via the conductive layer. By adopting the above technical solution, the conductive layer provided on the inner surface of the housing makes the housing as a whole form a conductor, and further the housing and the circuit board assembly are electrically connected together via the conductive layer, so that the housing containing the carbon fiber material itself is used as part of the antenna, thereby improving the antenna performance of the wearable electronic device whose housing is made of carbon fiber material.
Owner:HUAWEI TECH CO LTD

Multi-antenna anti-interference method and device, storage medium and program product

The invention discloses a multi-antenna anti-interference method, multi-antenna anti-interference equipment, a storage medium and a program product, and aims to solve the contradiction between poor performance of a sub-array architecture and overhigh calculation complexity of a full-array architecture. The method comprises the following steps: carrying out global synchronization processing by taking all array elements as a whole, and determining a shared synchronization point; the array is divided into a plurality of sub-arrays, each sub-array uses the synchronization point and independently calculates a set of anti-interference weights, and accordingly, sub-array output signals subjected to interference suppression are generated; and determining a group of optimal merging coefficients through an optimization algorithm with the purpose of maximizing the final signal quality, and performing weighted merging on all sub-array output signals to generate a final output signal. In addition, the method also comprises a mechanism for periodically updating an anti-interference weight and a merging coefficient. According to the method, through step-by-step processing and optimal combination, the calculation complexity is effectively reduced, meanwhile, the performance loss of a traditional sub-array scheme is avoided, and the anti-interference performance of a system in a dynamic complex environment is improved.
Owner:BEIJING RINFON TECH CO LTD