Radio frequency (RF) energy harvesting as an alternative energy source is an emerging technology that supplies energy for low power wireless devices. In this study, the impacts of RF sources, antenna gains, output power levels and path losses on charging times of an RF energy harvesting system were measured and analyzed in detail. An advanced measurement system that consisted of RF sources used as signal generators, dipole and patch antennas, an RF energy harvesting circuit and the other auxiliary devices were installed for acquiring measurement samples. The generated RF power signals in continuous wave mode at 915 MHz carrier frequency were collected wirelessly by the RF energy harvesting circuit for different antenna gains and output power levels at distances from 20 to 50 cm at the interval of 5 cm. The measurement samples were analyzed statistically. According to the measurement results, it was determined that double RF sources, 6.1 dBi antenna gain and 17 dBm output power level reduced the charging times by 63.09%, 59.24% and 46.41% on average, respectively.

中文翻译：

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射频能量采集系统充电次数显着影响的测量与分析

作为替代能源的射频 (RF) 能量收集是一种为低功率无线设备提供能量的新兴技术。在这项研究中，详细测量和分析了射频源、天线增益、输出功率水平和路径损耗对射频能量收集系统充电时间的影响。一个先进的测量系统由用作信号发生器的射频源、偶极子和贴片天线、射频能量收集电路和其他辅助设备组成，用于采集测量样本。在 915 MHz 载波频率的连续波模式下生成的 RF 功率信号由 RF 能量收集电路无线收集，用于在 20 到 50 cm 的距离处以 5 cm 的间隔针对不同的天线增益和输出功率电平。对测量样品进行统计分析。根据测量结果确定，双射频源、6.1 dBi 天线增益和 17 dBm 输出功率水平分别使充电时间平均减少了 63.09%、59.24% 和 46.41%。