Interest for Radio Frequency energy harvesting systems is increasing since they allow to remotely powered devices involving low power consumption, located in unreachable area or needing expensive maintenance costs. Miniaturization is also of great interest when such device needs to be embedded into mobile systems. In this paper, a compact PIFA rectenna (rectifier + antenna) was designed and evaluated for the Radio Frequency energy harvesting systems at 2.45GHz. By using a full-wave time domain technique (TLM), a global simulation is presented for designing a complete rectenna based on a RF-to-DC converter coupled to a miniature PIFA antenna. The RF-to-DC conversion efficiency of 60% is achievable over the input power range of 5–30mW. Also, a 1.9V output DC voltage could be reached when the RF power density is 1.6mW/cm2.
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机译：射频能量收集系统的兴趣正在增加，因为它们允许远程供电的设备，涉及低功耗的设备，位于无法到达区域或需要昂贵的维护成本。当需要嵌入到移动系统中时，小型化也很有兴趣。本文设计了一种紧凑的PIFA indenna（整流+天线），为2.45GHz的射频能量收集系统设计和评估。通过使用全波时域技术（TLM），呈现全局模拟，用于基于耦合到微型PIFA天线的RF-TO-DC转换器设计完整的RECTENNA。在5-30MW的输入功率范围内可实现60％的RF-TO-DC转换效率。此外，当RF功率密度为1.6mW / cm 2 时，可以达到1.9V输出直流电压。
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