| 主权项 |
1. A pressure sensor comprising:
a casing having a tubular shape with a hollow portion and having conductivity; a pressure receiving portion having conductivity and provided in the casing, the pressure receiving portion being capable of distorting by receiving a pressure of a measurement medium; a sensor unit provided in the casing by being disposed in the pressure receiving portion, the sensor unit outputting a sensor signal in accordance with the measurement medium; and an antenna unit disposed in the casing and having an antenna coil pattern, wherein the sensor unit has a surface acoustic wave detecting element including a first sensing electrode that generates and receives a surface acoustic wave and a first reflector that reflects the surface acoustic wave, which are provided on a substrate configured of a piezoelectric material, and a sensor coil pattern electrically connected to the first sensing electrode and having a coil coupling with the antenna coil pattern, and when the sensor unit receives a drive signal from the antenna unit by wireless communication resulting from the coil coupling, the sensor unit emits the surface acoustic wave from the first sensing electrode and receives the surface acoustic wave reflected by the first reflector, and transmits the sensor signal based on the received surface acoustic wave to the antenna unit by wireless communication resulting from the coil coupling. |
