  The environmental corrosiveness is governed for indoor applications by the
presence of gaseous pollutants in air and levels of temperature and relative
humidity. Its determination is a challenging task and requires the monitoring
of thickness reduction of selected metals in the range of few tens of
nanometers. The present work aims at developing an UHF RFID sensor dedicated to
such measurements. The sensor is based on the coupling between the antenna of a
commercial RFID tag and a thin layer of copper exposed to the environment. The
ability of the proposed sensor to be sensitive to a variation of the metal
thickness in the range of tens of nanometers is demonstrated experimentally
through exposure tests in a climatic chamber. The results are supported by
electromagnetic simulations performed in the case of a coupling between a
dipolar antenna and a thin metallic layer.
