Hybridization of Integrated Microwave and Mechanical Power Harvester

Abstract : An integrated ambient kinetic and microwave energy scavenger is presented in connection with its strategy of two-level hybridization, namely structural and functional integration of the two dissimilar energy harvesting techniques. Specifically, they are related to two-resonator/transducer integration and simultaneous/collaborative rectification. An F-shaped radiofrequency antenna serves as the microwave energy collector and a Michael Faraday's generator mounted on a mechanical beam cut out of the printed circuit board acts as the electrical current producer. Both microwave and mechanical resonators are optimally designed and accommodated on the same substrate with a compact size comparable to that of a credit card (80 mm × 50 mm). The demonstrated hybrid power harvester has a capacity to operate properly with either microwave or mechanical excitation. When both power sources are accessible, it can provide a notable efficiency enhancement compared with the separate harvesting of two single sources. The measurements show that at a typical injecting AC power of −38 dBm, the rectified DC output power could be increased by at least 50% compared with a direct summation of DC output power through two separate modes. An efficiency enhancement of 85% can be achieved when diode's injecting power sources are −45 dBm. With a strong resilience, such a hybrid power harvester is able to potentially find its wide practical applications. INDEX TERMS Energy harvester, Schottky diodes, hybrid harvesting, integrated rectifier, mechanical energy, rectenna, wireless sensor networks, Internet of Things.
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Xiaoqiang Gu, Weiqun Liu, Lei Guo, Simon Hemour, Fabien Formosa, et al.. Hybridization of Integrated Microwave and Mechanical Power Harvester. IEEE Access, IEEE, 2018, 6, pp.13921 - 13930. ⟨10.1109/access.2018.2814003⟩. ⟨hal-01901541⟩

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