Sensor system, reader, and sensor

A reader used in a sensor system including a reader side resonant circuit and a sensor side resonant circuit, the reader comprising the reader side resonant circuit, wherein

• the reader side resonant circuit is an LCR parallel resonant circuit and a gain circuit,
• the sensor side resonant circuit is an LCR parallel resonant circuit and a loss circuit having, as a first resistance portion, a sensor element having a first resistance that changes according to a target object to be sensed,
• the reader side resonant circuit and the sensor side resonant circuit are wirelessly connected to each other through magnetic field resonant coupling to constitute a gain-loss coupling circuit, and
• the reader side resonant circuit and the sensor side resonant circuit are formed so that the gain-loss coupling circuit has parity-time symmetry.

A sensor used in a sensor system including a reader side resonant circuit and a sensor side resonant circuit, the sensor comprising the sensor side resonant circuit, wherein

• the reader side resonant circuit is an LCR parallel resonant circuit and a gain circuit,
• the sensor side resonant circuit is an LCR parallel resonant circuit and a loss circuit having, as a first resistance portion, a sensor element having a first resistance that changes according to a target object to be sensed,
• the reader side resonant circuit and the sensor side resonant circuit are wirelessly connected to each other through magnetic field resonant coupling to constitute a gain-loss coupling circuit, and
• the reader side resonant circuit and the sensor side resonant circuit are formed such-so that the gain-loss coupling circuit has parity-time symmetry.