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This paper applies UWB technologies in a special aspect for the transmission of energy rather than messages to achieve a novel wireless impulsive powering approach and enhance the power conversion efficiency (PCE) for low average input power. The whole impulsive wireless power transmitting and receiving systems are implemented to validate the feasibility of the wireless power transmission (WPT) using impulsive waves and the improvement of the conversion efficiency of the rectifier circuitry. Experimental results prove that this technique is quite suitable for low input power transmission which is good for biomedical applications. In order to deliver the UWB power efficiently, a horn antenna with high directivity, large gain, and broad bandwidth acts as the transmit antenna. The impulsive power generated by the impulse generator is amplified by the UWB power amplifier and then delivered through the horn antenna. And the received impulsive power is converted by the voltage-doubler rectifier composed of Schottky diodes into a direct current (dc) power to supply the chips or rechargeable batteries. In this paper, the UWB impulsive wireless transmission systems have been proved to achieve 50% power conversion efficiency (PCE) even when the input power of the rectifier is lower than 0 dBm. Due to the fact that low transmission power has relatively little impacts and causes relatively slight injury to human bodies, it is one of the essential key technologies in biomedical implant chips and devices.
Date of Conference: 12-13 May 2011