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31results about How to "Guaranteed RF performance" patented technology

Method for manufacturing metal substrate by adopting reflow soldering

ActiveCN102123562AEnlarging the welding process windowImprove reliabilityPrinted circuit manufactureWindow openingRadio frequency
The invention provides a method for manufacturing a metal substrate by adopting reflow soldering, comprising the following steps: 1, providing a tin-stibium-tin paste, a metal base plate and a PCB (Printed Circuit Board); 2, designing a steel-mesh window-opening graphic according to the PCB and the metal base plate, and adopting a steel-mesh printing method to print the tin-stibium-tin paste on the metal base plate; 3, adopting a soldering jig to bear the PCB and the metal base plate, and providing the pressure size and uniformity required when the PCB and the metal base plate are soldered; and 4, adopting the reflow soldering method, setting the temperature for reflow soldering according to the melting requirement of the tin-stibium-tin paste and the size of the metal base plate, and leading the tin-stibium-tin paste to be melted to solder and laminate the PCB and the metal base plate into the metal substrate. In the method, the ultra-high-temperature tin-stibium-tin paste with heat conduction and electric conduction is adopted to solder the high-frequency PCB and the metal base plate together, and the radio-frequency performance of the high-frequency PCB and the radiating performance of the metal base plate are effectively guaranteed, so that the reliability of the metal substrate is improved, the processing cost is reduced, then non-layering of the PCB and the metal base plate also can be guaranteed when an electronic device is secondarily attached.
Owner:DONGGUAN SHENGYI ELECTRONICS

Printed circuit board component and manufacturing method thereof

The invention relates to the field of electrical connectors, in particular to a printed circuit board component and a manufacturing method thereof. The printed circuit board component comprises a printed circuit board and a radio frequency connector. The radio frequency connector is fixedly mounted on the printed circuit board, adopts the front end as a plug end and comprises a housing component and a radio frequency contact member which is mounted in the housing component; the radio frequency contact member comprises an inner conductor and an outer conductor, the rear end of the outer conductor is provided with an outer flange, the front surface of the printed circuit board is provided with a shielding conductive layer, the outer flange of the outer conductor is mounted on the shielding conductive layer in a fitted manner and is welded and fixed to the shielding conductive layer, and the rear end of the inner conductor is covered with the outer conductor completely. According to the printed circuit board component, since the front surface of the printed circuit board is provided with the shielding conductive layer, the rear end of the inner conductor is covered with the outer conductor completely, during usage, the inner conductor of the radio frequency contact member can be coated with the outer conductor completely, the problem that the isolation degree is low according to a radio frequency contact member of an existing printed circuit board component with a radio frequency connector can be solved.
Owner:CHINA AVIATION OPTICAL-ELECTRICAL TECH CO LTD

Antenna device and electronic device

The invention discloses an antenna device and an electronic device. The electronic device comprises a metal cell cover with a slit structure, and a plastic support structure arranged in the slit structure. The antenna device comprises a slit antenna body formed by being along a first edge, in contact with the top end face of the plastic support structure, of the metal cell cover. A connection part is arranged on the metal cell cover to divide the slit antenna body into two segments. The slit antenna body is short circuited with a grounding end through the connection part. The antenna device also comprises a first tuning part, a second tuning part and a feed part which are successively arranged between the connection part and the first end of the slit antenna body. The first tuning part is connected with the grounding end through a first switch matching circuit. The second tuning part is connected with the grounding end through a second switch matching circuit. The feed part is connected with a radio frequency front end through a spring sheet or a flexible circuit board. According to the invention, when multi-band reuse is achieved, radio frequency performance of each brand and light and thin performance of the electronic device can be ensured.
Owner:VIVO MOBILE COMM CO LTD

Constructing method of data card with multimedia broadcasting function and antenna thereof

A rotating USB joint is arranged at the front end of an integrally rectangular data card and a main antenna of the data card is arranged at the rear end, and the side surface of the rear end is provided with a CMMB pull rod antenna. The working frequency of the main antenna is usually 900MHz, and the receiving frequency of CMMB (UHF waveband) is 470-798MHz. For the design, the distance between the two antennae is long to the greatest extent, thus the interference is least. For the USB design, the usability of the USB joint is strengthened, and the rotating USB joint is conveniently applied to various notebook PCs for a user. With respect to a data card of a non-rotating USB joint, the length of the data card of the rotating USB joint can be equal to the sum of the length of the USB joint and the length of the non-rotating USB joint. Corresponding to the condition of unchangeable integral length, the length of the data card is extended, which is beneficial to prolonging the foundation of the CMMB pull rod antenna, thereby enabling the CMMB pull rod antenna to be longer when extended and the performance to be better; meanwhile, a customer can not think that the data card is too long when the USB joint is inserted into a slot during the non-work.
Owner:盐城新咏投资发展有限公司

Method and apparatus for improving radio frequency power consumption of mobile terminal

The invention discloses a method and apparatus for improving radio frequency power consumption of a mobile terminal. The method comprises the following steps: detecting whether a mobile terminal is switched from a normal use electricity consumption mode to a smart electricity saving mode, and if the mobile terminal is switched from a normal electricity consumption mode to a smart electricity saving mode, then lowering the APT voltage value of a radio frequency power amplifier, such that ICQ of the radio frequency power amplifier is deviated from a normal point and ACLR property is lowered and working current is reduced. According to the invention, the method is easy to operate, enables the mobile terminal to acquire longer time of duration, improves user experience, enables a user to switch the mobile terminal between the two working modes on the basis of actual needs, and when the mobile terminal is switched to normal use electricity consumption mode, can guarantee radio frequency indexing property of the mobile terminal.
Owner:GUANGDONG OPPO MOBILE TELECOMM CORP LTD

Three-dimensional stacked packaging module single-board testing tool and testing method

ActiveCN106872873ASolve the disadvantages of occupying a large area of ​​heat transfer surfaceSolve the characteristics of small connection operation spaceElectronic circuit testingControl signalFixed frame
The invention relates to a three-dimensional stacked packaging module single-board testing tool. The three-dimensional stacked packaging module single-board testing tool is composed of four parts of a control signal and radiofrequency signal circuit board and an installation module thereof (1010), a vertical interconnection connector and an installation frame thereof (1020), a circuit board to be tested and a fixing frame thereof (1030) and a radiofrequency signal output module (1040). The vertical interconnection connector and the installation frame thereof (1020) are composed of an installation frame (1021), vertical transition connectors (1022) and guide sleeves (1023); the circuit board to be tested and the fixing frame thereof (1030) are composed of a metal plate to be tested (1031) and a circuit board (1032); and the signal output module (1040) is composed of radio frequency connectors (1041), hexagon copper posts (1042), fuzz button conversion coaxial connectors (1043), guide pillars (1044), a mounting base plate (1045), microstrip boards (1046) and cover plates (1047). By employing the three-dimensional stacked packaging module single-board testing tool, the contact area of a radiator is increased, space of the thermal design is expanded, natural heat dissipation can satisfy the demand, and the difficulty level and cost of the thermal design are reduced.
Owner:LEIHUA ELECTRONICS TECH RES INST AVIATION IND OF CHINA

Radio frequency connector and manufacturing method thereof

The invention relates to a radio frequency connector and a manufacturing method thereof, which relate to the field of signal transmission and aims at requiring no brazing and no gold plating when the radio frequency connector is manufactured and ensuring the positioning precision and the packaging air tightness of the radio frequency connector. According to the technical scheme adopted by the invention, conductive sealing glass powder, the conductive sealing glass powder and an organic binder are mixed, granulation is carried out, and granulation powder is formed; according to the appearance of a radio frequency terminal, the granulation powder is manufactured into a conductive sealing glass perform; and the conductive sealing glass perform is placed between the radio frequency terminal and a shell and is heated to a sealing temperature, the conductive sealing glass perform is thus combined with the radio frequency terminal and the shell respectively. According to the radio frequency connector manufacturing method, through manufacturing the conductive sealing glass perform and heating the conductive sealing glass perform, the conductive sealing glass perform is in a melt state, the radio frequency terminal is thus sealed with the shell, and the method can ensure the air tightness and the radio frequency performance of the radio frequency connector, accurate positioning and high reliability.
Owner:CHINA BUILDING MATERIALS ACAD

Mobile terminal and antenna of same

ActiveCN105789882ASpeed ​​up development and debuggingSpeed ​​up the shaping processRadiating elements structural formsAntenna equipments with additional functionsInductorElectrical and Electronics engineering
The invention discloses a mobile terminal. The mobile terminal comprises a shell, a printed wiring board, a metal frame, a first connector, a second connector and a first antenna, wherein the metal frame encircles the shell and comprises a first frame, a second frame and a third frame, the first frame is provided with a first gap, the first connector is connected with the first frame on the first gap, the second connector is connected with the third frame and a ground end of the printed wiring board separately, the first antenna comprises a first antenna main radiation body, a first part, a second part, a first inductor, a third part, a fourth part and a fifth part, the first part parallel to the first frame is connected with the first connector, the second part parallel to the third frame is connected with the first part, the first inductor is connected with the second part and the ground end of the printed wiring board separately, the third part is arranged under the second part and is parallel to the second part, one end of the third part is suspended, the fourth part parallel to the first part is connected with a second inductor and the third part separately, and the fifth part parallel to the first part is connected with the second inductor and a first feeding end of the printed wiring board separately. By the mobile terminal, the antenna cost is reduced, and the mobile terminal is convenient and flexible to debug. The invention also discloses an antenna of the mobile terminal.
Owner:BYD CO LTD

Low-cost radio frequency differential amplifier

The invention discloses a low-cost radio frequency differential amplifier. The differential amplifier comprises an input balun, a differential radio frequency circuit, and an output balun, wherein the input balun is used for outputting an input radio frequency single-ended signal by converting the same into a balancing mode from an unbalancing mode by use of two sub-baluns so as to obtain a differential signal required by the differential radio frequency circuit; the differential radio frequency is used for amplifying the balanced radio frequency signal output by the input balun; and the output balun is used for outputting the balanced radio frequency signal, which is output by the different radio frequency circuit, by converting the same into the unbalancing through two sub-baluns. By use of the differential amplifier disclosed by the invention, the layout of the system is compact while the radio frequency performance of the circuit is guaranteed, the chip area around an active device is sufficiently utilized, and the cost is effectively lowered.
Owner:SHANGHAI HUAHONG GRACE SEMICON MFG CORP

Method for manufacturing metal substrate by adopting reflow soldering

ActiveCN102123562BEnlarging the welding process windowImprove reliabilityPrinted circuit manufactureWindow openingRadio frequency
The invention provides a method for manufacturing a metal substrate by adopting reflow soldering, comprising the following steps: 1, providing a tin-stibium-tin paste, a metal base plate and a PCB (Printed Circuit Board); 2, designing a steel-mesh window-opening graphic according to the PCB and the metal base plate, and adopting a steel-mesh printing method to print the tin-stibium-tin paste on the metal base plate; 3, adopting a soldering jig to bear the PCB and the metal base plate, and providing the pressure size and uniformity required when the PCB and the metal base plate are soldered; and 4, adopting the reflow soldering method, setting the temperature for reflow soldering according to the melting requirement of the tin-stibium-tin paste and the size of the metal base plate, and leading the tin-stibium-tin paste to be melted to solder and laminate the PCB and the metal base plate into the metal substrate. In the method, the ultra-high-temperature tin-stibium-tin paste with heat conduction and electric conduction is adopted to solder the high-frequency PCB and the metal base plate together, and the radio-frequency performance of the high-frequency PCB and the radiating performance of the metal base plate are effectively guaranteed, so that the reliability of the metal substrate is improved, the processing cost is reduced, then non-layering of the PCB and the metal base plate also can be guaranteed when an electronic device is secondarily attached.
Owner:DONGGUAN SHENGYI ELECTRONICS

Electromagnetic wave control method and device

ActiveCN110474167AReduce SARNo need to reduce transmit powerAntenna arraysSignal qualityTransmitted power
The invention discloses an electromagnetic wave control method and device. The method comprises: determining a phase adjustment mode of the radiation beam of each antenna element in an antenna array when it is detected that an object approaches the antenna array, in order that the phase of the radiation beam of each antenna elements is a target phase, wherein the phase adjustment mode includes performing phase adjustment and not performing phase adjustment; and superposing and combining the radiation beams of the antenna elements whose phases are the target phases in order to obtain a target electromagnetic wave in a predetermined direction. The method controls the direction of the radiation beam of each antenna element in the antenna array so as to control the direction of the superimposed combined electromagnetic wave, so that the direction of the combined electromagnetic wave is away from a human body, thereby reducing SAR without a decrease in transmitting power and ensuring RF performance so as to ensure signal quality.
Owner:LENOVO (BEIJING) LTD

Heterogeneous micro-packaging method for radio frequency power amplifier chip

The invention discloses a heterogeneous micro-packaging method for a radio frequency power amplifier chip, which is applied to the technical field of radio frequency and aims to solve the problem that the service life is not considered during hole arrangement in the conventional packaging technology. The heat dissipation through holes are optimized through the simulation technology, so that the optimized heat dissipation through hole layout meets the related parameter performance of chip packaging, and the radio frequency performance and the heat dissipation problem of the chip packaging are effectively balanced.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA

Circuit structure manufacturing method and circuit structure

The invention provides a circuit structure manufacturing method and a circuit structure. The method comprises the following steps: S1, providing an inorganic material substrate; S2, polishing at leastone surface of the inorganic material substrate; S3, carrying out electromagnetic irradiation on a polished surface of the inorganic material substrate according to the shape of a circuit to be formed so as to form an irradiated pattern; S4, activating the polished surface, at least containing the irradiated pattern, of the inorganic material substrate; and S5, electroplating or chemically plating a metal clad layer on the activated irradiated pattern so as to form the circuit. According to the circuit structure manufacturing method and the circuit structure provided by the invention, a metalcompound or a metal media does not need to be used, the yield is high, and the circuit performance is good.
Owner:SHANGHAI AMPHENOL AIRWAVE COMM ELECTRONICS CO LTD

Current multiplexing radio frequency front end structure

The invention discloses a current multiplexing radio frequency front end structure, and belongs to the technical field of electronic circuits. The current multiplexing radio frequency front end structure comprises a mixer, a low noise amplifier and a static bias current control circuit, the signal output end of the low-noise amplifier is connected with the signal input end of the frequency mixer;the low-noise amplifier and the frequency mixer realize static bias current sharing through a three-terminal inductor; a static bias current control circuit is connected between the power supply voltage and the third end of the three-end inductor, and the static bias current control circuit is used for increasing the current flowing to the low-noise amplifier; the static bias current control circuit comprises a PMOS transistor, a source electrode and a grid electrode of the PMOS transistor are connected, the source electrode of the PMOS transistor is connected with power supply voltage, and adrain electrode of the PMOS transistor is connected with the third end of the three-end inductor; the problem that an existing radio frequency front end structure is large in power consumption is solved. And the effects of reducing the power consumption of the radio frequency front-end structure and realizing the low-power-consumption application of the wireless sensor network are achieved.
Owner:SHANGHAI HUAHONG GRACE SEMICON MFG CORP

Easy-to-bend flexible transmission line

The invention provides an easy-to-bend flexible transmission line. The easy-to-bend flexible transmission line comprises metal grounds, a signal layer and a dielectric layer, wherein the plurality ofmetal grounds form a multilayer structure of the transmission line, the dielectric layer fills the space among the plurality of metal grounds, and the signal layer is embedded into the dielectric layer. The top metal ground located on the top surface of the dielectric layer and the bottom metal ground located on the bottom surface of the dielectric layer are provided with buffer holes in the bending area. According to the transmission line provided by the invention, windowing copper reduction design is carried out in the bending area, on the premise of ensuring the radio frequency performanceof the flexible transmission line, the flexible transmission line can complete required bending processing, and copper reduction is carried out in the bending area, so that the process difficulty canalso be reduced. The problems that a traditional flexible transmission line is large in resilience force and bending difficulty and inconvenient to bend are solved.
Owner:苏州硕贝德创新技术研究有限公司

A kind of radio frequency connector and preparation method thereof

The invention relates to a radio frequency connector and a manufacturing method thereof, which relate to the field of signal transmission and aims at requiring no brazing and no gold plating when the radio frequency connector is manufactured and ensuring the positioning precision and the packaging air tightness of the radio frequency connector. According to the technical scheme adopted by the invention, conductive sealing glass powder, the conductive sealing glass powder and an organic binder are mixed, granulation is carried out, and granulation powder is formed; according to the appearance of a radio frequency terminal, the granulation powder is manufactured into a conductive sealing glass perform; and the conductive sealing glass perform is placed between the radio frequency terminal and a shell and is heated to a sealing temperature, the conductive sealing glass perform is thus combined with the radio frequency terminal and the shell respectively. According to the radio frequency connector manufacturing method, through manufacturing the conductive sealing glass perform and heating the conductive sealing glass perform, the conductive sealing glass perform is in a melt state, the radio frequency terminal is thus sealed with the shell, and the method can ensure the air tightness and the radio frequency performance of the radio frequency connector, accurate positioning and high reliability.
Owner:CHINA BUILDING MATERIALS ACAD

Mixed-type near-field communication (NFC) antenna and fabrication method thereof

The invention discloses a mixed-type near-field communication (NFC) antenna and a fabrication method thereof. The mixed-type NFC antenna comprises an ultrathin antenna and a secondary antenna, wherein the ultrathin antenna comprises a first polymer thin sheet and an antenna radiator; the antenna radiator is printed on the first polymer thin sheet, and comprises an antenna port; the secondary antenna comprises a second polymer thin sheet and an antenna feeder; the antenna feeder is printed on the second polymer thin sheet; the secondary antenna is located above the antenna radiator; one end of the antenna feeder is connected with the antenna port; the other end of the antenna feeder is connected to a mobile phone mainboard; and the secondary antenna and the ultrathin antenna are jointed with the connected part of the antenna feeder and the antenna port. According to the mixed-type NFC antenna, the overall thickness of the antenna can be reduced under the premise that the radio-frequency performance is ensured; the mixed-type NFC antenna can be suitable for the requirements of the structural design of an ultrathin mobile phone; the manufacturing cost of the antenna is low; and by an aluminum printed circuit, compared with an existing flexible printed circuit board (FPCB) paved with copper on double surfaces, the cost is reduced by 30%.
Owner:ETHETA COMM TECH SHENZHEN CO LTD

Signal test system and method without radio frequency test socket with symmetrical tuning unit

The present invention is a non-radio frequency test seat signal test system with a symmetrical tuning unit, which is applied to a test system without a radio frequency test seat; when in use, a radio frequency test probe, a symmetrical tuning unit and a test instrument module are used, and the radio frequency test probe connects the antenna The matching circuit is connected to the symmetrical tuning unit, the symmetrical tuning unit is connected to the test instrument module, the symmetrical tuning unit is used to match the antenna matching circuit, and a symmetrical two-port radio frequency path is formed between the radio frequency chip and the test instrument. The symmetrical tuning unit and the antenna matching circuit form a symmetrical radio frequency path, which ensures that the return loss of the two directions of the radio frequency path is very close, so as to achieve the purpose of ensuring the authenticity of the detection effect when detecting from one direction, and ensure the dual-port network of the entire radio frequency path Excellent RF performance, on the basis of reducing RF test sockets, reduces the operational complexity of impedance matching, saves adjustment time and verification time, and ensures the effectiveness of the detection effect.
Owner:深圳合一测试科技有限公司

System and method for implementing frequency band compatibility

The invention discloses a system and a method for achieving frequency band compatibility. The system comprises a PCB and a frequency band compatible circuit, wherein the frequency band compatible circuit comprises a transceiver, a central processor, an antenna, an antenna switch, a first duplexer, a second duplexer, a single-pole double-throw switch and two short-circuit welding pads, wherein both ends of the transceiver are connected with two output ports of differential output signals of the single-pole double-throw switch, both ends of a first differential input end in the single-pole double-throw switch are connected with two output ends of the differential output signals of the single-pole double-throw switch separately through one of the independent short-circuit welding pads, two ports of the first differential input end in the single-pole double-throw switch are connected with the first duplexer, two ports of a second differential input end in the single-pole double-throw switch are connected with the second duplexer, output ends of the two duplexers are connected with the antenna through the antenna switch, and the central processor is connected with the single-pole double-throw switch. The system and the method achieve coexistence of two frequency bands truly, and ensure the RF performance.
Owner:NINGBO SAGEREAL COMM

Electronic device

The invention discloses an electronic device, and relates to the communication accessory technology. The electronic device can prevent the radio frequency performance of an antenna from being influenced. The electronic device comprises a shell and the electronic device antenna used for communication with the outside. The shell comprises a first area corresponding to the electronic device antenna and a second area besides the first area, wherein the first area is a metal shell. The electronic device antenna is arranged in the first area of the shell and coupled with the metal shell of the first area. The metal shell of the first area and the electronic device antenna form an integral radio frequency structure piece. The electronic device is mainly applied to the field of communication.
Owner:LENOVO (BEIJING) CO LTD

Power cord and household appliances having same

The invention discloses a power line and a household appliance therewith. The power line comprises a power line body, a wireless communication element and a plug. The power line body comprises a powerline harness and a communication line harness. The plug is connected with the power wire harness, and the wireless communication element comprises a housing with an accommodation cavity and a wireless communication module arranged in the accommodation cavity. The housing is arranged on the power line body, and the communication line harness extends into the accommodation cavity to be connected with the wireless communication module. A part of the power line harness is located in the accommodation cavity and is separated from the wireless communication module. According to the embodiment of the invention, the power line can protect the communication of the wireless communication element from being influenced by the electromagnetic radiation interference of the electric equipment, enables the communication of the wireless communication element to be stable and reliable, can enable the wireless communication element to have enough installation space, guarantees the radio frequency performance of the wireless communication element, improves the antenna efficiency of the wireless communication element, is lower assembly difficulty of the wireless communication element, and is high in operability.
Owner:GUANGDONG MIDEA KITCHEN APPLIANCES MFG CO LTD

A kind of antenna device and electronic equipment

The invention discloses an antenna device and an electronic device. The electronic device comprises a metal cell cover with a slit structure, and a plastic support structure arranged in the slit structure. The antenna device comprises a slit antenna body formed by being along a first edge, in contact with the top end face of the plastic support structure, of the metal cell cover. A connection part is arranged on the metal cell cover to divide the slit antenna body into two segments. The slit antenna body is short circuited with a grounding end through the connection part. The antenna device also comprises a first tuning part, a second tuning part and a feed part which are successively arranged between the connection part and the first end of the slit antenna body. The first tuning part is connected with the grounding end through a first switch matching circuit. The second tuning part is connected with the grounding end through a second switch matching circuit. The feed part is connected with a radio frequency front end through a spring sheet or a flexible circuit board. According to the invention, when multi-band reuse is achieved, radio frequency performance of each brand and light and thin performance of the electronic device can be ensured.
Owner:VIVO MOBILE COMM CO LTD

Mobile terminals and antennas for mobile terminals

The invention discloses a mobile terminal. The mobile terminal comprises a shell, a printed wiring board, a metal frame, a first connector, a second connector and a first antenna, wherein the metal frame encircles the shell and comprises a first frame, a second frame and a third frame, the first frame is provided with a first gap, the first connector is connected with the first frame on the first gap, the second connector is connected with the third frame and a ground end of the printed wiring board separately, the first antenna comprises a first antenna main radiation body, a first part, a second part, a first inductor, a third part, a fourth part and a fifth part, the first part parallel to the first frame is connected with the first connector, the second part parallel to the third frame is connected with the first part, the first inductor is connected with the second part and the ground end of the printed wiring board separately, the third part is arranged under the second part and is parallel to the second part, one end of the third part is suspended, the fourth part parallel to the first part is connected with a second inductor and the third part separately, and the fifth part parallel to the first part is connected with the second inductor and a first feeding end of the printed wiring board separately. By the mobile terminal, the antenna cost is reduced, and the mobile terminal is convenient and flexible to debug. The invention also discloses an antenna of the mobile terminal.
Owner:BYD CO LTD

Power line and household appliance therewith

The invention discloses a power line and a household appliance therewith. The power line comprises a power line body, a wireless communication element and a plug. The power line body comprises a powerline harness and a communication line harness. The plug is connected with the power wire harness, and the wireless communication element comprises a housing with an accommodation cavity and a wireless communication module arranged in the accommodation cavity. The housing is arranged on the power line body, and the communication line harness extends into the accommodation cavity to be connected with the wireless communication module. A part of the power line harness is located in the accommodation cavity and is separated from the wireless communication module. According to the embodiment of the invention, the power line can protect the communication of the wireless communication element from being influenced by the electromagnetic radiation interference of the electric equipment, enables the communication of the wireless communication element to be stable and reliable, can enable the wireless communication element to have enough installation space, guarantees the radio frequency performance of the wireless communication element, improves the antenna efficiency of the wireless communication element, is lower assembly difficulty of the wireless communication element, and is high in operability.
Owner:GUANGDONG MIDEA KITCHEN APPLIANCES MFG CO LTD
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