An antenna operable to transmit or receive radio frequency signals at a specified frequency, the antenna comprising a first printed circuit board comprising a first loop of conductive material having a capacitance and an inductance, the capacitance and the inductance forming a circuit being resonant...http://www.google.es/patents/US7408525?utm_source=gb-gplus-sharePatente US7408525 - Compact radio frequency transmitting and receiving antenna and control device employing same
Compact radio frequency transmitting and receiving antenna and control ...
