Frequency multiplexed radio frequency identification

A system comprising:

• an enclosure;
• an RFID interrogator configured for generating an RFID signal, wherein a channel frequency of the RFID signal changes over time;
• a first narrow band antenna, coupled to the enclosure, characterized by a first passband, the first passband corresponding to a first range of frequencies;
• a second narrow band antenna, coupled to the enclosure, characterized by a second passband, the second passband corresponding to a second range of frequencies, wherein the second range of frequencies differs from the first range of frequencies, whereby the second passband differs from the first passband;
• and
• first and second feed lines, configured for feeding the RFID signal to each of the first and second narrow band antennas, respectively,
• wherein the first narrow band antenna is configured to transmit a first electromagnetic wave in response to and at the channel frequency of the RFID signal fed thereto, if the channel frequency of the RFID signal falls within the first passband, and
• wherein the second narrow band antenna is configured to transmit a second electromagnetic wave in response to and at the channel frequency of the RFID signal fed thereto, if the channel frequency of the RFID signal falls within the second passband.