Millimeter-wave Passive Patch Antenna for Use in Wireless High-temperature Sensor

Abstract

We propose a passive patch antenna temperature sensor architecture consisting of a transceiver and a passive patch antenna temperature sensor made of RO3003 and Mg 2 SnO 4 ceramic substrates, respectively.The millimeter dielectric properties of Mg 2 SnO 4 ceramic were examined with a view to its use as a wireless high-temperature passive patch antenna temperature sensor.A dielectric constant of 3.97 and a loss factor of 5.42 × 10 -2 were obtained for Mg 2 SnO 4 ceramic sintered at 1550 °C for 4 h.We report the development procedures and test results for a passive patch antenna temperature sensor.The resonating frequency and 3 dB bandwidth of the sensor measured at 25 °C were 30.6210GHz and 1530 MHz, respectively.The measurement resonant frequency decreased from 30.6210 to 30.3790 GHz when the operating temperature increased from 25 to 225 °C, which correspond to a sensitivity and linearity of -1.210 MHz/°C and 0.06%, respectively.