System and method for detecting the proximity of a body
First Claim
1. A method for detecting the proximity of a body using an antenna capable of having its impedance altered 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 method comprising steps of:
- sampling radio frequency electromagnetic energy reflected by the antenna within a predetermined frequency band;
measuring the sampled radio frequency electromagnetic energy;
determining proximity of the antenna to the body based on the amount of radio frequency electromagnetic energy measured,wherein determining proximity of the antenna to the body comprises calculating a reflection coefficient from the radio frequency electromannetic energy reflected by the antenna, the determined reflection coefficient deviating from a predetermined reflection coefficient for the antenna in free space when the antenna is in proximity to the body.
3 Assignments
0 Petitions
Accused Products
Abstract
A system and method for sensing the proximity of an electronic device, in particular, a radio frequency mobile communication device such as a mobile telephone, wireless modem equipped portable computer, or the like to a body employs an antenna capable of altering its impedance for changing the amount of radio frequency electromagnetic energy reflected by the antenna when the antenna is in proximity to the body. The radio frequency electromagnetic energy reflected by the antenna is measured and used for determining proximity of the antenna to the body.
42 Citations
10 Claims
-
1. A method for detecting the proximity of a body using an antenna capable of having its impedance altered 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 method comprising steps of:
-
sampling radio frequency electromagnetic energy reflected by the antenna within a predetermined frequency band; measuring the sampled radio frequency electromagnetic energy; determining proximity of the antenna to the body based on the amount of radio frequency electromagnetic energy measured, wherein determining proximity of the antenna to the body comprises calculating a reflection coefficient from the radio frequency electromannetic energy reflected by the antenna, the determined reflection coefficient deviating from a predetermined reflection coefficient for the antenna in free space when the antenna is in proximity to the body. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
-
Specification