METHODS FOR REDUCING NEAR-FIELD RADIATION AND SPECIFIC ABSORPTION RATE (SAR) VALUES IN COMMUNICATIONS DEVICES

摘要

A method is provided introducing a phase offset between signals applied to antenna ports of an antenna having multiple antenna elements, such that a first signal applied to one of the antenna ports operatively coupled to one of the antenna elements has a different phase than a second signal applied to another one of antenna ports operatively coupled to another one of the antenna elements to obtain an antenna pattern control. A reduced power is used that is lower than the power used in a non-pattern control operation of the antenna such that a wireless link performance criteria is met with equipment at a far-field point using the reduced power compared to the non-pattern control operation, thereby reducing near field radiation.

主权项

1. A method, comprising:
introducing a phase offset between signals applied to antenna ports of an antenna structure such that a first signal applied to one of the antenna ports has a different phase than a second signal applied to another one of the antenna ports to provide antenna pattern control and to increase gain in a direction toward a far-field point, wherein the antenna structure comprises a plurality of antenna elements, each operatively coupled to a different one of the antenna ports, wherein electrical currents flowing in the antenna structure are such that the antenna ports are isolated at a particular signal frequency range; and operating at a reduced power that is lower than a power used in a non-pattern control operation of the antenna structure such that a first communications device utilizing the antenna structure satisfies an equivalent wireless link performance with a second communications device at the far-field point using the reduced power compared to the non-pattern control operation, thereby reducing near field radiation.