Shifted Source Impedance and Nonlinearity Impact on RFID Transponder Communication for Drive-Level Offsets
Journal article, 2016

A measurement and analysis method to quantify the communication quality for ultrahigh-frequency radio frequency identification (RFID) transponder chips under a shifting source environment is presented. A detailed description of theory, setup, and procedure is provided. The differences in on/off impedance (|ΔΓ|-value) of the transponder chip are critical for backscatter modulation and, therefore, the overall communication and transponder response. In the present work, a new quantity which includes the difference in on/off impedance, as well as arbitrary source impedance, is defined as an overall figure of merit. A qualitative analysis, considered as novel in the RFID community, shows the impact a source impedance shift has on the communication quality. The bare chip measurement setup enables an ASK modulated wake up signal, realized as a pulse train. The chip response consisting of modulated impedance states are measured in a pulse profile setup. Results show that different degrees of non-linearity in a transponder chip, depending on vendor and type, will have impact on the communication performance.



radio frequency identification (RFID)


ultrahigh-frequency (UHF).


SG probe

EPC Gen2


Markus Frank

Chalmers, Microtechnology and Nanoscience (MC2), Electronics Material and Systems Laboratory

Mattias Thorsell

Chalmers, Microtechnology and Nanoscience (MC2), Microwave Electronics

Peter Enoksson

Chalmers, Microtechnology and Nanoscience (MC2), Electronics Material and Systems Laboratory

IEEE Transactions on Microwave Theory and Techniques

0018-9480 (ISSN)

Vol. 64 1 299 - 309

Areas of Advance

Information and Communication Technology

Subject Categories


Driving Forces

Innovation and entrepreneurship



More information

Latest update