Roy Sunanda, Tiang Jun-Jiat, Roslee Mardeni Bin, Ahmed Md Tanvir, Kouzani Abbas Z, Mahmud M A Parvez
Faculty of Engineering (FOE), Multimedia University, Persiaran Multimedia, Cyberjaya 63000, Malaysia.
School of Engineering, Deakin University, Waurn Ponds, Geelong, VIC 3216, Australia.
Sensors (Basel). 2022 Jan 6;22(2):424. doi: 10.3390/s22020424.
For low input radio frequency (RF) power from -35 to 5 dBm, a novel quad-band RF energy harvester (RFEH) with an improved impedance matching network (IMN) is proposed to overcome the poor conversion efficiency and limited RF power range of the ambient environment. In this research, an RF spectral survey was performed in the semi-urban region of Malaysia, and using these results, a multi-frequency highly sensitive RF energy harvester was designed to harvest energy from available frequency bands within the 0.8 GHz to 2.6 GHz frequency range. Firstly, a new IMN is implemented to improve the rectifying circuit's efficiency in ambient conditions. Secondly, a self-complementary log-periodic higher bandwidth antenna is proposed. Finally, the design and manufacture of the proposed RF harvester's prototype are carried out and tested to realize its output in the desired frequency bands. For an accumulative -15 dBm input RF power that is uniformly universal across the four radio frequency bands, the harvester's calculated dc rectification efficiency is about 35 percent and reaches 52 percent at -20 dBm. Measurement in an ambient RF setting shows that the proposed harvester is able to harvest dc energy at -20 dBm up to 0.678 V.
对于-35至5 dBm的低输入射频（RF）功率，提出了一种具有改进阻抗匹配网络（IMN）的新型四频段射频能量收集器（RFEH），以克服环境中转换效率低下和射频功率范围有限的问题。在本研究中，在马来西亚的半城市地区进行了射频频谱调查，并利用这些结果设计了一种多频段高灵敏度射频能量收集器，以从0.8 GHz至2.6 GHz频率范围内的可用频段收集能量。首先，采用一种新的阻抗匹配网络来提高整流电路在环境条件下的效率。其次，提出了一种自互补对数周期高带宽天线。最后，进行了所提出的射频能量收集器原型的设计和制造，并进行测试以实现其在所需频段的输出。对于在四个射频频段上均匀分布的累积-15 dBm输入射频功率，该能量收集器计算得出的直流整流效率约为35%，在-20 dBm时达到52%。在环境射频环境中的测量表明，所提出的能量收集器能够在-20 dBm下收集直流能量，最高可达0.678 V。
