System and method for reducing SAR values
First Claim
Patent Images
1. A system for controlling the average power and duration of radio frequency electromagnetic energy radiated by a mobile communication device, comprising:
- an antenna having an impedance that is alterable for changing the amount of radio frequency electromagnetic energy provided to the antenna via an antenna feed and reflected onto the antenna feed when the antenna is in proximity to a body, the antenna being detuned when not in proximity to the body and becoming tuned when in proximity to the body;
a sensor coupled to the antenna for sensing radio frequency electromagnetic energy reflected by the antenna for determining the proximity of the antenna to the body, the sensor determining proximity of the mobile communication device to the body by measuring radio frequency electromagnetic energy reflected by the antenna in the vicinity of the body; and
a controller for controlling radiation of radio frequency electromagnetic energy by the mobile communication device,wherein the controller is capable of reducing at least one of the average power and the duration of the radio frequency electromagnetic energy radiated by the mobile communication device when the sensor assembly senses that the mobile communication device is in proximity to the body.
3 Assignments
0 Petitions
Accused Products
Abstract
A system and method for reducing the Specific Absorption Rate (SAR) of a mobile communication device employs a sensor assembly for sensing when the mobile communication device is in proximity to a body such as a human body, animal body, or the like. The average power of the radio frequency electromagnetic energy radiated by the mobile communication device may then be reduced only when necessary so that the SAR value for the device is maintained below a predetermined acceptable level.
-
Citations
33 Claims
-
1. A system for controlling the average power and duration of radio frequency electromagnetic energy radiated by a mobile communication device, comprising:
-
an antenna having an impedance that is alterable for changing the amount of radio frequency electromagnetic energy provided to the antenna via an antenna feed and reflected onto the antenna feed when the antenna is in proximity to a body, the antenna being detuned when not in proximity to the body and becoming tuned when in proximity to the body; a sensor coupled to the antenna for sensing radio frequency electromagnetic energy reflected by the antenna for determining the proximity of the antenna to the body, the sensor determining proximity of the mobile communication device to the body by measuring radio frequency electromagnetic energy reflected by the antenna in the vicinity of the body; and a controller for controlling radiation of radio frequency electromagnetic energy by the mobile communication device, wherein the controller is capable of reducing at least one of the average power and the duration of the radio frequency electromagnetic energy radiated by the mobile communication device when the sensor assembly senses that the mobile communication device is in proximity to the body. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
-
9. A system for controlling the average power and duration of radio frequency electromagnetic energy radiated by a mobile communication device, comprising:
means for sensing when the mobile communication device is in proximity to a body, the sensing means including means for receiving radio frequency electromagnetic energy reflected by an antenna having an impedance that is alterable for changing the amount of radio frequency electromagnetic energy provided to the antenna via an antenna feed and reflected onto the antenna feed when the antenna is in proximity to the body, the antenna being detuned when not in proximity to the body and becoming tuned when in proximity to the body and means for sensing radio frequency electromagnetic energy within a predetermined frequency band, the proximity of the mobile communication device to the body being determined by measuring radio frequency electromagnetic energy reflected by the antenna; and means for controlling the average radiation of radio frequency electromagnetic energy by the mobile communication device, wherein the controlling means is capable of reducing at least one of the power and the duration of the radio frequency electromagnetic energy radiated by the mobile communication device when the mobile communication device is in proximity to the body. - View Dependent Claims (10, 11, 12, 13)
-
14. A system for controlling the avenge power of radio frequency electromagnetic energy radiated by a mobile communication device, the mobile communication device being capable of operating in a first mode wherein the mobile communication device is suitable for use in proximity to a human body and a second mode wherein the mobile communication device is unsuitable for use in proximity to the human body, the system comprising:
-
a sensor assembly for detecting when the mobile communication device is in proximity to the human body, the sensor assembly including an antenna having an impedance that is alterable for changing the amount of radio frequency electromagnetic energy provided to the antenna via an antenna feed and reflected onto the antenna feed when the antenna is in proximity to the body, the antenna being detuned when not in proximity to the body and becoming tuned when in proximity to the body and a sensor coupled to the antenna for sensing radio frequency electromagnetic energy reflected by the antenna for determining the proximity of the antenna to the body, the sensor determining proximity of the mobile communication device to the human body by measuring radio frequency electromagnetic energy reflected by the antenna; and a controller for controlling radiation of radio frequency electromagnetic energy by the mobile communication device, wherein the controller is capable of reducing the average power of the radio frequency electromagnetic energy radiated by the mobile communication device when the mobile communication device is in the second mode and the sensor assembly senses that the mobile communication device is in proximity to the human body. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21)
-
-
22. A method for controlling the Specific Absorption Rate (SAR) value of a mobile communication device, the mobile communication device being capable of operating in a first mode wherein the mobile communication device is suitable for use in proximity to a human body and a second mode wherein the mobile communication device is unsuitable for use in proximity to the human body, the method comprising the steps of:
-
determining whether the mobile communication device is operating in the first mode or the second mode; sensing when the mobile communication device is in proximity to the human body by sampling radio frequency electromagnetic energy reflected by an antenna, the antenna being detuned when not in proximity to the body and becoming tuned when in proximity to the body and measuring the reflected radio frequency electromagnetic energy for determining the proximity of the mobile communication device to the human body; and reducing the avenge radiated power of the mobile communication device when the mobile communication device is in the second mode and is in proximity to the human body. - View Dependent Claims (23, 24, 25, 26)
-
-
27. A mobile communication device capable of operating in a first mode wherein the mobile communication device is suitable for use in proximity to a human body and a second mode wherein the mobile communication device is unsuitable for use in proximity to the human body, the mobile communication device comprising:
-
an antenna having an impedance that is alterable for changing the amount of radio frequency electromagnetic energy provided to the antenna via an antenna feed and reflected onto the antenna feed when the antenna is in proximity to the body, the antenna being detuned when not in proximity to the body and becoming tuned when in proximity to the body; a sensor for sensing radio frequency electromagnetic energy reflected by the antenna for determining the proximity of the antenna to the body, the sensor determining proximity of the mobile communication device to the body by measuring radio frequency electromagnetic energy reflected by the antenna in the vicinity of the body; and a controller for controlling radiation of radio frequency electromagnetic energy by the mobile communication device, wherein the controller is capable of reducing at least one of the average power and duration of the radio frequency electromagnetic energy radiated by the mobile communication device when the mobile communication device is in the second mode and the sensor senses that the mobile communication device is in proximity to the human body. - View Dependent Claims (28, 29, 30, 31, 32, 33)
-
Specification