The objective of this thesis is to propose an autonomous receiving system, which is part of a sensor node for plant health monitoring. This latter is meant to be used in the Internet of Things (IoT) for collecting data in agricultural applications, so that the farmers can use the real-time information from the fields to make the best decision for the optimization of the resources having as objective the enhancement of the sustainability and the efficiency in the management of the crops. The energy harvesting from environmental sources can replenish the sensor nodes with the energy required to ensure a long-term autonomous operation.