Small meandered PIFA associated with SAW passive sensor for monitoring inner temperature of a car exhaust header

Wireless sensors based on passive surface acoustic wave (SAW) technology serve to accurately determine physical quantities in harsh environments. In this paper, we present a meandered planar inverted-F antenna (PIFA) with a small ground plane designed to be associated with a SAW sensor to monitor the inner temperature of a car exhaust header. The SAW sensor, the design of the antenna, the association of both elements and some wireless interrogation results are presented.