SAR reduction in radio transmitting devices

摘要

An antenna device (1) comprising a non-conductive substrate (2), wherein the antenna is in the form of a conductive pattern printed on either one or both sides of the non-conductive substrate. The conductive printed pattern includes an antenna element (5) configured for electrical connection to a coplanar groundplane (8) at a ground connection (13,13′), and further configured for electrical connection to a transmitter/receiver at a feed connection, and a passive antenna arm (115) connected to the coplanar groundplane at a passive antenna arm ground connection (116). A SAR reduction system comprising a grounded parasitic resonating conducting element is positioned on one side of the non-conductive substrate and is adapted to couple with the passive antenna arm and reduce the electromagnetic field generated by the antenna element at a predetermined frequency.