| 主权项 |
1. A system, comprising:
a radio frequency device having:
a memory storing at least one identification number of the device;an antenna system having a first resonant frequency and a second resonant frequency;a transceiver coupled to the antenna system to receive signals transmitted in the first frequency and signals transmitted in the second frequency; anda processor coupled with the memory and the transceiver to provide the identification number of the device; and a first communication apparatus configured to interrogate the radio frequency device using the first frequency; and a second communication apparatus, separate from the first communication apparatus, configured to interrogate the radio frequency device using the second frequency concurrently with the first communication apparatus interrogating the radio frequency device using the first frequency. |
