Analysis of UHF RFID Tag Antennas Using an Equivalent Circuit Approach
Abstract
In this paper, we describe an equivalent circuit-approach to analyze one of the most common UHF RFID tag antennas, a T-matched dipole. We derive analytically closed-form expressions for all three tag resonant frequencies (two for tag sensitivity and one for backscatter). We show using a practical tag example, a 70 mm x 14 mm antenna designed for various items, how an equivalent circuit model can be effectively used for understanding its behavior and optimizing its performance. We also present experimental data that demonstrates good agreement with the model.
Fields of Study & Subjects
RFID technology advancements
Energy Harvesting in Wireless Networks
Antenna Design and Analysis
Publication details
- Journal / source
- IEEE Journal of Radio Frequency Identification
- Publisher
- Institute of Electrical and Electronics Engineers (IEEE)
- Volume
- 10
- Pages
- 136–149
- Publication date
- 1 January 2026