415 results about "Specific absorption rate" patented technology

A radio antenna apparatus is provided with an antenna connected with a radio communication circuit that transmits and receives a radio signal. A load impedance element is connected between a parasitic element of an electrical conductor plate and a ground of a housing of a radio communication apparatus including the radio communication circuit. A controller controls an element value of the load impedance element so as to set a current flowing on the housing to be equal to or smaller than a predetermined value when the radio communication apparatus transmits the radio signal, thereby controlling a specific absorption rate (SAR) to be equal to or smaller than a predetermined value.

An external fixation system has clamps, rods and pins having anti-magnetic core parts and a non-conductive sheath part covering essentially the exterior surfaces of the core part. The rods, pins and clamps are especially MRI safe for a patient when used in any frame configuration for fractures of the upper and lower extremities and pelvis wherein the usual MRI field parameters of a static field of 2 Tesla, a time-varying filed of max. 20 Tesla / sec and a specific absorption rate (SAR) of max. 0.4 Watts / kg averaged over the whole body of the patient apply.

An advanced antenna or set of antennae for a wireless device is provided by embedding the antennae into the battery case or generally the largest surface area of a wireless phone. The antenna connections are made through the battery's connections to the wireless device. The antenna design can be compact and located in any area of the battery. The antenna design can be thin and flat, located at the back surface of the battery or the large rear surface of a wireless phone, facing away from the user. An RF shielding device can be embedded into the battery and configured in relation to the antenna such that the RF field intensity and the consequent specific absorption rate for the user is lowered while the outgoing signals of the wireless device remain fully adequate for the function of the wireless device. This feature is preserved for a multi-band operation because a digital phase shifter is used between two radiating antennae. An external case is used as a complement to the wireless phone to provide additional antennae, power and capability.

An oriented PIFA-type apparatus for reducing hearing aid radio frequency (RF) interference including a directional multi-band and / or single band antenna for use with PWDs such as digital cellphones is disclosed. The apparatus greatly reduces or eliminates the audio noise induced in hearing aids by the PWDs and allows operation of a hearing aid during PWD operation. In operation, the apparatus may be provided on the PWD side away from the user's head. The apparatus may be integrated into the PWB during its manufacture or provided as an after market assembly for a PWD that has a port for connection of an external antenna. The apparatus provides for improved front-to-back ratio as compared to antennas currently in use on PWD's, and therefore also reduces SAR (specific absorption rate), the level of RF energy received into the head by a PWD.

The invention discloses a mobile terminal and a method for reducing specific absorption rate. The mobile terminal comprises an input unit, a control unit, a memorizer, a switch, an antenna group and a radio frequency circuit. The control unit is respectively connected with the input unit, the memorizer and the switch, the antenna group comprises a plurality of antennae, and the switch is respectively connected with each antenna and the radio frequency circuit. The input unit is used for monitoring a position relative to the mobile terminal and informing the obtained position to the control unit. The memorizer is used for memorizing the corresponding information of position to specific absorption rate of each antenna. The control unit is used for searching the specific absorption rate of each antenna in obtained position through detecting from the corresponding information of the position to specific absorption rate of each antenna memorized in the memorizer, according to the obtained position through detecting of the input unit, the antenna is chosen according to the specific absorption rate of the obtained position through the detecting of each antenna, and the switch is controlled to be communicated with the antenna and the radio frequency circuit. The mobile terminal and the method for reducing the specific absorption rate are capable of reducing radiation of the mobile terminal to a human body and the head of the human body.