Equivalent Circuit Analysis of an Open-Ended Slot Type RFID Tag Antenna

In this paper, we discuss UHF (RAIN) RFID tags with open-ended slot type antennas. We show that such tags can be analyzed using the same equivalent circuit that represents T-matched dipole tags. We explore the correspondence between slot type tag antenna geometry and its equivalent circuit parameters. We also present a practical
$80\ \text{mm}\times 25\ \text{mm}$
RFID tag example with good agreement between model and measurements.