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J. Electromagn. Eng. Sci > Epub ahead of print
[Epub ahead of print] Published online July 27, 2023.
A Compact Low-Loss Reflection-Type Harmonic Transponder for Battery-Less RFID Sensors Based on Harmonic Backscattering
Daju Lee, Juntaek Oh
School of Electronic Engineering, Soongsil University, Seoul, Korea
Correspondence:  Juntaek Oh,Email: kingojt@ssu.ac.kr
Received: 6 November 2022   • Revised: 16 January 2023   • Accepted: 13 February 2023
This study presents a compact reflection-type harmonic transponder with a wide input power range for battery-less radio frequency identification (RFID) sensors based on harmonic backscattering. Miniaturizing the circuit size of conventional harmonic transponders is difficult because the input and output matching stages are configured separately, and two antennas are used for each port. The proposed harmonic transponder based on a dual-band matching network matches the load simultaneously at the fundamental and second harmonic frequencies over a wide input power range, thus enhancing the conversion gain (CG) with a compact size. For verification, the proposed transponder is implemented in a compact size with dimensions of 19 mm × 17.8 mm. The measured CG of the implemented transponder is maintained at over −10 dB in the wide input power range of −6.4 dBm to 10.6 dBm at 2.45 GHz. Th e harmonic transponder is configured with a dual-band chip antenna and measured in free space to verify whether it is suitable for battery-less RFID sensors. The measured detectable effective distance to the proposed circuit is 6.3 m in free space, with an equivalent isotropically radiated power of 42.6 dBm.
Key words: Backscattering, Dual-Band Matching Network (DBMN), Nonlinear Radar, Harmonic Transponder, RFID Sensors
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