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Shifted Source Impedance and Nonlinearity Impact on RFID Transponder Communication for Drive-Level Offsets

Markus Frank (Institutionen för mikroteknologi och nanovetenskap, Elektronikmaterial och system ) ; Mattias Thorsell (Institutionen för mikroteknologi och nanovetenskap, Mikrovågselektronik) ; Peter Enoksson (Institutionen för mikroteknologi och nanovetenskap, Elektronikmaterial och system )
IEEE transactions on microwave theory and techniques (0018-9480). Vol. 64 (2016), 1, p. 299 - 309.
[Artikel, refereegranskad vetenskaplig]

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.

Nyckelord: De-embedding, differential, EPC Gen2, mismatch, radio frequency identification (RFID), SG probe, transponder, ultrahigh-frequency (UHF).



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Denna post skapades 2016-03-11. Senast ändrad 2016-04-28.
CPL Pubid: 233130

 

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