Wireless telemetry system with independent Power and Data frequency resonance

Wireless power and data transmission systems are important components in bioelectronics. Achieving resonance at the data transmission frequency without negatively impacting the efficiency at the power transmission frequency may enhance data transmission capability. In this letter, a new system referred to as tuned inductor four capacitor is proposed to achieve resonance at the data transmission frequency of a wireless telemetry system without significantly affecting the efficiency at the power transmit frequency; as a result, this leads to increased voltage and current gains and reduced reflections at the data transmit frequency when compared to an equivalent, traditional, two-coil system. The performance of the proposed design is demonstrated through a system implementation characterized by a transmit coil of 40 mm diameter and receive coil of 15 mm diameter, with a distance between them varied from 17 to 40 mm. This system is experimentally compared with the equivalent two-coil system that has the same transmit and receive coil footprint and layout but conventional transmitter matching circuitry. Results show that, at the data telemetry frequency, there is no reflection, the voltage gain is 60% higher than that of the traditional two-coil system, whereas the current gain is 250% higher.