  -This paper presents an inkjet printing capacitive microwave sensor for toxic
vapor detection. The designed sensors were presented and fabricated with
success. The experiments show sensitivity to ethanol vapor according to the S
parameters. It is equal to 0.9 kHz/ppm and 1.3 kHz/ppm for the sensors based on
5 and 50 sensitive layers respectively. This sensor will be integrated into
real-time multi-sensing platforms adaptable for the Internet of Things (IoT).
