Radio-Frequency Identification Usage in Food Traceability ...
2016-1-1u2002·u2002Passive tags at different frequencies. Type (A) is a Low-Frequency tag copper coil of an half duplex (HDX) transponder used in RF animal ear tag identifiers (134 kHz). Tag models (B) and (C) have HF square coils (13.56 MHz), while those identified by the letters (D), (E), (F), and (G) are UHF tag antennas of different shapes.
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