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In this paper, we describe an RF energy-harvesting circuit printed on a single FR4 substrate to ensure compact and low profile design at 2.1 GHz. The circuit integrates a notched Circular Microstrip Patch Antenna (CMPA) with a fully matched single diode rectifier to form an efficient rectifying antenna. By cutting two electrically small triangular notches, at 45° and 315° of the patch, it is possible...
This paper presents a batteryless transmitter for wireless sensor systems. Unlike the conventional battery powered sensor transmitters, our proposed transmitter is powered from a cellular energy-harvesting circuit, a microwave energy transmission technique that has capacity to harvest 3.2 V in 5.5 hours at 0 dBm of incident cellular signals (2 GHz). The transmitter is built around a 2.4 GHz nRF24L01+...
This paper presents the basic characteristics of the wireless power transfer system using sheet-like waveguide, free access mat. Free access mat has small transmission loss, concentrates the EM wave into itself and is easy to couple by external antennas. By applying two free access mats to the transmitter and the receiver, small coupling loss between two terminals is expected. One-dimensional free...
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