Studies of indoor wave propagation and antenna diversity in UHF RFID systems

Luis C. Vieira, Nathan J Gomes, John Batchelor, Philippos Assimakopoulos, Lucas Schwendler Vieira

DOI: 10.14209/sbrt.2019.1570559022

Evento: XXXVII Simpósio Brasileiro de Telecomunicações e Processamento de Sinais (SBrT2019)

Keywords:

Abstract

Analytical and experimental investigations considering indoor wave propagation and antenna diversity are presented for passive UHF RFID systems. Modelling results are reported for two-ray and three-ray reflection models, with the effect of floor and ceiling relative permittivity discussed. A novel multi-LOS multi-ray reflection model, considering transmit antenna diversity, is proposed with good results reported. From experiments, a receive diversity scheme shown the best performance in comparison with transmit diversity and no diversity cases. A promising performance improvement in the tag readability is also demonstrated (without antenna diversity) by simply placing an aluminium plate on the floor nearby a commercial tag.

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