107results about How to "Reduce SAR value" patented technology

A mobile phone capable of reducing an electromagnetic SAR in human bodies includes a base and a cover disposed on the base. The base includes an antenna for transmitting and receiving electromagnetic waves. The cover includes a screen and buttons. Electromagnetic absorbing materials having electric or magnetic loss are applied on the cover to mitigate electromagnetic waves radiating from the antenna into the user. Moreover, a meandered planar inverted-F antenna is attached to the back of the circuit board near the bottom of the base, which can generate a lower near field at the user's side than those in other directions, thereby reducing the electromagnetic specific absorption rate of the mobile phone in human bodies.

The invention discloses a mobile phone and a method for automatically adjusting the radiation of the mobile phone. The mobile phone includes a radio frequency chip, a baseband chip, a proximity sensor and a power amplifier. The radio frequency chip generates radio frequency signals. The baseband chip is connected with the radio frequency chip and controls the radio frequency chip to generate radio frequency signals. The proximity sensor is connected to the baseband chip and starts when it detects the approach of a human face. The power amplifier is connected with the radio frequency chip and the baseband chip. When the proximity sensor is not activated, the baseband chip controls the power amplifier to adjust the transmission power of the radio frequency signal to the first transmission power according to the first radio frequency parameter. When the proximity sensor is activated, the baseband chip controls the power amplifier according to the second radio frequency parameter. Adjust the transmit power of the radio frequency signal to the second transmit power. The first transmit power is greater than the second transmit power. Through the above method, when the user approaches the mobile phone to talk, the transmission power of the radio frequency signal adjusted by the power amplifier can be automatically reduced, thereby reducing radiation.

The invention discloses a narrow-spacing low-SAR high-isolation MIMO antenna. The narrow-spacing low-SAR high-isolation MIMO antenna comprises a PCB and two antenna bodies used for supporting different service signals, wherein the two antenna bodies are distributed on the two sides of the top end of the PCB and respectively provided with feeding points, the antenna bodies are connected to the PCB through the feeding points respectively, and the feeding points of the two antenna bodies are asymmetrically distributed. According to the antenna, the feeding positions are arranged in the asymmetrical positions on the same side of the PCB, it is avoided that the feeding positions of the antenna are located in the symmetrical current resonance positions, and the isolation degree between the antennas is improved.

A system and method for medium access control (MAC) protocol which controls transmissions in wireless devices to at least substantially comply with specific absorption rate (SAR) limits. The system and method of MAC protocol uses “source-based” time averaging measurements of transmitter “on-times” and an integral of transmission power to direct transmitter duty-cycle such that SAR limits are met. The system and method monitors and controls topology-dependent functions of a node transceiver, including transceiver duty cycle, transceiver transmit power levels and transceiver power-time products, using a automatic transmission control protocol (ATP) to vary functions to maintain specific absorption rate (SAR) limits for handheld and portable devices which are used close to human bodies. In cases in which SAR limits are approached, the ATP can direct the transceiver at the device to adjust each function, or combination of functions, to maintain an acceptable SAR limit.

The invention discloses an antenna array system, a control method and a terminal. The antenna array system comprises an array control module and an antenna array, wherein the array control module is used for controlling the radiation direction of an antenna array pattern to enable a main lobe of the antenna array pattern to face the direction with the maximum base station signal strength; and antenna array is used for transmitting and receiving signals under control of the array control module. Through adjusting the antenna pattern, the main lobe of the antenna radiates towards the base station direction in a non-stop mode, the transmission efficiency of the mobile terminal is improved, and a SAR (Specific Absorption Rate) value is reduced.

In a method for adjustment of a B1 field in a magnetic resonance apparatus, the position of the measurement subject relative to a coordinate system is determined from a plurality of measurement subjects with a morphological magnetic resonance measurement. Three-dimensionally associable measurement subject data are determined from the measurement subject. Respective tissue types of the measurement subject are determined using the three-dimensional measurement subject data and a segmentation of the measurement subject into regions is effected using the tissue types. Known dielectric properties are respectively associated with the tissue types. The segmentation and the association for all positions of the measurement subject are recorded in respective entries of a database, such that the database contains all entries of the measurement subjects. A radio-frequency simulation for an transmission coils is implemented with the entries of the database, with which electrical field distributions and/or B1 field distributions related to spatial elements are determined as a simulation result and are entered as results into the database. For further magnetic resonance examinations, the entries of the database are used for determination of an optimized current distribution for elements of a transmission coil with which the B1 field is ultimately adjusted.

The present disclosure relates to an apparatus and method for transmitting power compensation in a mobile communication terminal. Under a preferred embodiment, a terminal is equipped with a power amplifier, whose output signal amplitude is dependent upon a frequency of an input signal of the power amplifier, an HF connector, an internal antenna and a connection for an external antenna and which is designed to be operated in at least one mobile radio frequency range. The configuration aims to effectively optimize a specific absorption rate value. At least one standard mobile radio frequency range is subdivided into several frequency intervals and power compensation is carried out for at least part of the frequency intervals.

The embodiment of the invention provides a method and a terminal device for regulating antenna transmission power, which are applied to the technical field of communication, so as to solve the problemthat the terminal device mistakenly reduces the transmission power when transmitting radio frequency signals through the antenna. Specifically, the scheme is applied to a terminal device including anantenna.The method comprises the following steps of: acquiring a first image in the case of transmitting a radio frequency signal through an antenna, wherein the first image includes a biometric characteristic of a user; when the biometrics of the user matches the biometrics of the preset head, the transmitting power of the transmitted radio frequency signal is adjusted to be the target power, and the target power is the transmitting power corresponding to the preset head biometrics. The preset biometrics includes user's preset eyebrow feature, preset eye feature, preset nose feature, presetmouth feature and preset ear feature. The scheme is specifically applied to the scenario where the terminal equipment reduces the transmission power of the transmitted radio frequency signal.

An antenna module is provided. The antenna module includes a first slot antenna unit and a second slot antenna unit. The first slot antenna unit is coupled to a radio frequency (RF) unit. The second slot antenna unit is coupled to the RF unit. The first and second slot antenna units are embedded in a wireless communications dongle, and the wireless communications dongle operates as a modem to transmit or receive a wireless signal to or from a wireless telephony communications network for a computer via the first and second slot antenna units when the wireless communication dongle connects to the computer.

The invention relates to a communication device, comprising a first circuit board, a second circuit board and an antenna. The first circuit board is arranged on the second circuit board, and is electrically connected with the second circuit board by a connecting point. The first circuit board comprises a clear zone, a plurality of key pads and a plurality of inductors, wherein the key pads correspond to the clear zone, and the inductors are respectively connected between the key pads in series for regulating the inductance of the key pads. The antenna comprises a radiation metal sheet which corresponds to the clear zone and is positioned at one side of the second circuit board so as to receive and transmit wireless signals. By the communication device, SAR value can be effectively reduced,and the design elasticity of the antenna limited by the design of the dimension of the communication device is increased.

The invention provides a mobile terminal and a method for reducing the electromagnetic wave energy absorption ratio thereof. The method comprises the following steps of: determining to arrange a wave-absorbing material on a flexible printed circuit (FPC) of an LCD (Liquid Crystal Display) in the mobile terminal; and attaching the wave-absorbing material to the FPC to absorb the electromagnetic wave energy radiated by an antenna of the mobile terminal. By using a method of adding the wave-absorbing material at the specific position of the mobile terminal, the invention not only reduces the SAR (Synthetic Aperture Radar) value of the mobile terminal, but also ensures that the TRP (Transmission Reference Point) of the mobile terminal is not reduced. Therefore, the influence of the mobile terminal on the human radiation can be reduced on the premise without influencing the calling quality and the appearance of the mobile terminal; meanwhile, the method is easier to realize.

The invention relates to a terminal antenna for reducing a specific absorption rate (SAR) of a data card and a molding method of the terminal antenna. The terminal antenna has an annular antenna structure connected with the data card, wherein the annular antenna structure at least comprises two sections of parallel slot lines; and the current flow directions in the parallel slot lines are opposite. By the annular arrangement, the SAR of a wireless terminal product is reduced, and the aims of realizing the whole bandwidth and reducing the SAR of a preset frequency range by changing the annular wiring form can be fulfilled under the condition that the bandwidth is guaranteed.

The invention provides an antenna capable of reducing an equipment SAR value. The antenna comprises a main circuit board and an antenna circuit board, wherein an adjustable power divider, and a first antenna matching network and a second antenna matching network respectively connected with the adjustable power divider are arranged on the main circuit board, a first antenna and a second antenna are respectively printed on the front and back sides of the antenna circuit board, the first antenna is connected with the first antenna matching network, and the second antenna is connected with the second antenna matching network. Antennas are printed on the front and back sides of an antenna circuit board, and no extra antenna units or devices added on the surrounding of an antenna are needed, thereby simplifying antenna design and saving space. Reconstruction of an antenna directional diagram can be realized through adjusting of a power division network. The SAR value can be effectively reduced through further adjusting antenna radiation direction. Commissioning is flexible, and the performance of an antenna can be optimized by fine tuning antenna wiring and matching elements.

The present invention relates to a terminal and an antenna layout method for reducing a specific absorption rate. By disposing an offloading antenna which is near a main communications antenna and coupled to the main communications antenna in an opposite direction, a magnetic field around the main communications antenna is impaired, and a field strength of the main communications antenna is reduced, so that the field strength is directly proportional to an SAR value; when the field strength is reduced, the SAR value is reduced, that is, the SAR value is reduced by adding the offloading antenna coupled to the main communications antenna in an opposite direction.

A dome switch assembly that can reduce the SAR value and improve radiation performance of a mobile communication terminal and a mobile communication terminal having the same are provided. The ground layer of the dome switch assembly is connected to a hinge by a hinge contact unit. The hinge contact unit extends through a groove formed in the ground layer towards the inside area of the ground layer and is connected to a bottom surface of the groove. The position and length of the connection of the hinge contact unit to the ground layer may be adjusted so that the SAR value can be reduced and radiation performance can be improved.

The invention provides a wireless communication device which comprises a circuit board, an antenna, a metal module and an inductive reactance module, wherein a feed part and an earthing part are arranged on the circuit board; a clearance area is arranged at the tail end of the circuit board; the antenna is arranged in the clearance area, and electrically connected with the feed part and the earthing part; the metal module is electrically connected with the feed part and the earthing part of the circuit board by the inductive reactance module, and arranged in the clearance area; and the metal module and the antenna are arranged at an interval. According to the wireless communication device, the metal module is arranged in a reasonable position of the clearance area of the antenna, and the energy of an area with higher current distribution on the antenna is reduced by adjusting an inductance value of the inductive reactance module in a fundamental mode without influencing signal transmitting or receiving of the antenna, so that the energy of a hotspot area originally influencing an SAR (Specific Absorption Rate) of the antenna is uniformly dispersed, absorption of an electromagnetic wave by a human body is reduced, and a purpose of reducing the SAR is achieved.

The invention provides an antenna component based on a mobile terminal. The antenna component comprises an antenna arranged in the mobile terminal. The antenna comprises two groups of antenna branches. At least one group of antenna branch is arranged at the lower side of the back surface of the front shell of the mobile terminal. The invention also provides the mobile terminal which is equipped with the antenna component. Compared with the antenna components in the prior art, at least one group of antenna branch is arranged at the lower side of the back surface of the front shell so that the person is enabled to have a certain spatial distance from the antenna when the person is close to the terminal, the radiation of the antenna to the human body can be reduced, the OTA requirements of the antenna can be met and the requirement of reducing the SAR value can be met, the process of using a distance sensor to act as a switch control processor to reduce power can also be eliminated and thus the cost can be reduced.