Patent ID: 7181199

Claim:
A method for automatically exchanging objects in a wireless mobile environment, comprising: (1) initiating communication with a compatible element; (2) transmitting a request for objects to said compatible element; (3) receiving at least some of said requested objects from said compatible element; and (4) processing said received objects; wherein said compatible element includes at least one of an interrogator and a source within a wireless communication range of operation; wherein step (3) is performed using a frequency down-conversion module comprising a switch, a capacitor coupled to said switch, and a pulse generator coupled to said switch; and wherein said pulse generator outputs pulses to said switch, wherein said pulses have apertures and cause said switch to close and sub-sample a carrier signal over said apertures, and wherein energy is transferred from the carrier signal and stored using said capacitor during said apertures of said pulses, and wherein a lower frequency signal is generated from the transferred energy.