Xuan Viet Linh Nguyen soutient sa thèse le 03/02/2023 (10h00)
Lieu : Bibliothèque INSA Lyon - Amphithéâtre E. du Chatelet
Jury :
Rapporteurs : Aleksandar PRODIC, Valérie VIGNERAS
Examinateurs : Philippe BENECH, Jean-Marc DUCHAMP, Delphine BECHEVET
Encadrement Ampère : Bruno ALLARD, Michel CABRERA
Résumé :
Internet of Things (IoT) or Internet of Objects is defining a new era of technology, where the electrical devices communicate with each other wirelessly. IoT devices have their applications in many fields in our quotidian life, such as telecommunications, education, health care, industrial domains, etc. A barrier to overcome in the development of these devices is their autonomic energy supply scheme. In the aspect of energy supply scheme, Radio Frequency Energy Harvester (RFEH) is selected among recent energy harvester mechanisms (thermal, mechanical, light, etc.). Another interesting aspect is the possibility of integrating the RFEH onto the surface of polymeric objects, which are often largely unused. This seems impossible with PCB and FLEX-PCB, but Plastronics allows to realize this idea. Therefore, the objective of this work is to demonstrate the feasibility of RFEH with a low cost, versatile Plastronics technology developed in our laboratory, suitable for prototyping. This technology, called Rapid Plastronics, is based on the fabrication of the device substrate by 3D printing, using Stereolithography (SLA), and realizing the conductive traces applying Electroless Deposition (ELD). The objective was not to develop this technology, but to apply it in the RF (which was not done before) and RFEH context.
This thesis is conducted in the following phases.
In the first phase, the studies of materials manufacturing process (Stereolithography (SLA) substrate, ELD copper) in Rapid Plastronics, relative permittivity, loss tangent of the substrate, and resistivity of the conductor are carried out. These parameters have a crucial role in designing the antennas and the RF-DC rectifier.
In the second phase, designs of patch antenna for the energy harvesting (EH) applications are discussed. Firstly, a fundamental linearly polarized patch antenna operating at 2.45 GHz is studied, and the impacts of the SLA substrate and the ELD copper on the performance of the antenna are mentioned. Then, the circularly polarized patch antennas being able to capture all the polarizations in the air are studied.
The third phase is about the RF-DC rectifiers, the proposed Power Management Unit (PMU) as well as the electrical interconnection between the designed antennas, the rectifiers and the PMU. The technique of matching the 50 Ω impedance between the antenna and the rectifier is presented. Moreover, the technique of identifying the optimal load of the rectifier that offers a vision of setting up the impedance interference between the designed rectifier and the PMU will be also introduced.
In the last phase, the performance of the assembling of the PMU, the rectifiers and the antennas will be analyzed
Mots-clés :
Radio Frequency Energy Harvesting, Antennas, Power Management Unit, Plastronics, Rapid Plastronics, Stereolithography, Electroless Deposition
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