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Wireless power transmission using mid-range magnetic resonance has become an important technology in body area sensor systems. Recent researches have used fine-tuned impedance matching for wireless power transmission at fixed distance. However, this method is significantly sensitive to the distance change between two devices since the impedances at both ends must be perfectly matched. Hence, it is a major challenge to achieve efficient wireless power transmission in mobile environment. We propose a new circuit architecture for wireless power transmission in the near field; the Resonator Isolation (RI) structure. Using the RI structure, the wireless power transmission becomes highly robust under mobile environment. In this paper, we present the circuit design of the RI structure and evaluate its performance with the actual systems we constructed. [ABSTRACT FROM PUBLISHER]

In this paper, we propose a power autonomous sensor platform with ultra-low power radio frequency (RF) transceiver and wireless charging. The ultra-low power RF transceiver consists of super-regenerative receiver and direct-modulation transmitter with multi-cell power amplifier. Although the proposed transmitter and receiver only consume 1.79 and 0.683 mW, respectively, the wearable sensor platform requires more power efficient transmitter, due to the limited capacity of rechargeable thin film battery, e.g, 50 ∼ 250 mWhr [1]. Therefore, we apply wireless charging in order to prolong the lifetime and investigate the impact of wireless power transfer on the power autonomy of sensor platform. [ABSTRACT FROM PUBLISHER]