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You can buy the Sensor, which comes with everything you need to attach it to your mailbox, as well as an antenna for $29.99. Or you can buy the Sensor and a Ring Bridge for $49.99.

Abstract: This review paper summarizes a new flexible sensor concept based on the microstrip patch antenna technology. The principle of the patch antenna as a sensing element and the wireless ...

In this paper, a sensor based on a 60 GHz rectangular patch antenna is presented, for characterising materials based on the permittivity variation in the reactive near-field. The resonant frequency of ...

The sensor contains an antenna that captures the energy from the router. The sensor stores that energy and, once there is enough, the sensor switches on, measures the temperature and sends a ...