Thru-the-Soil Long Range Wireless Power Transfer

A through the soil (TTS) long range wireless power transfer system is presented that can transfer energy underground between vertical wells. A description of the prototype system with theoretical and experimental measurements is used to develop understanding of the technology. Measurements proving a Thevinin equivalent load model are provided, and an equation for untuned efficiency. An agricultural sensor is used as a demonstration load that measures soil moisture, temperature, and humidity. Data from the sensor is successfully recorded and transmitted by LoRA to a base station. The system is capable of delivering approximately 1. 25W over a distance of 45m.