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RFID+ Exam Cram by Robert Sabella, Eva Zeisel, Mark Brown

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RFID Antennas

RFID antennas are always connected to an interrogator. This allows for the transmission of signals to and from the tag.

Antenna Design

Depending on the design, antennas can be either mono-static or bi-static:

  • Mono-static antennas are based on a principle by which a single antenna transmits a signal coming from the interrogator to the area as well as receives a signal coming from tags and these functions are switched in fractions of seconds. This requires use of a circulator in a reader that multiplexes the receive and transmit signals through a single port. There is some loss and phase distortion due to the use of a circulator.

  • Bi-static antennas include two antennas, where one antenna is dedicated to transmitting, and the other ...

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