Table 4
The antenna structure, thickness, working frequency, working efficiency and highlights of RF-EH reported in the literatures
| Antenna structure | Thickness | Working frequency | Work efficiency (%) | Highlight | Year | Ref. |
| Differential microstrip antenna | 1.6 mm | 870 MHz‒1.05 GHz | 80 | Gain-enhanced differential microstrip antenna | 2015 | [193] |
| ‒ | 95 μm | 0.93 and 2.63 GHz | 12.6 | Compact dual band RF-EH | 2017 | [190] |
| Dual-port L-probe microstrip patch antenna | 1.6 mm | GSM900, GSM-1800 and UMTS-2100 | 40 | Omnidirectional energy collection | 2017 | [191] |
| Dual-band monopole antenna | 0.8 mm | 0.88 and 1.85 GHz | 62 | Dual-band rectifier antenna | 2018 | [192] |
| Six-port hexagonal antenna array | 0.787 mm | 5.8 GHz | 67.75 | High-gain circularly polarized hexagonal antenna array | 2023 | [194] |
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