Defense of the doctoral thesis of Do Hanh Ngan BUI, for the University Grenoble Alpes , speciality "OPTICS et RADIOFREQUENCIES ", entitled:
Amphi M001 -Phelma -Minatec 3 rue parvis Louis Néel 38016 Grenoble cedex1
«Printed flexible antenna for ambient Radio-Frequency energy harvesting »
Bui Do Hanh Ngan
Wednesday, October 25, 2017 at 14:00
Internet-of-Things means a growing development of interconnected objects that are likely to change many services within the industry as well as for the individual. Several barriers, including the energy autonomy of objects or production processes that are economically acceptable and respectful of the planet, hamper current developments. In this context, energy recovery is a widespread theme using a wide range of sources (mechanical, thermal, electromagnetic, etc.). This thesis is oriented towards the recovery of ambient electromagnetic energy. The second characteristic point of this thesis is to focus on flexible and, if possible, recyclable substrates. The challenge is to recover energy from an extremely low ambient electromagnetic field: this concerns the antenna, which must also meet a requirement for flexibility for its future integration with a flexible and deformable object, and the electronics of energy processing. The work of this thesis conducted in three phases:
In the first phase, it was the study of the antenna structures compatible with frequency and power received with the energy harvesting application and a physical realization on flexible base (paper, textile, etc.). This phase allowed presenting the different approaches to combining the RF sources.
In the second phase, the study on the role of rectifying circuit in the system of recovering wireless energy was presented. Methods for extracting parameters were discussed by separating each element and its roles. Numerous measurements have been conducted to compare different models of the diode, taking into account also the actual impact of the manufacturing process and the measurement process.
A third phase allows the optimization of the antenna and electronic assembly (rectenna) for various scenarios and the monitoring of variability to keep the losses of the system at minima. The production of relevant demonstrators, test and characterization were presented.
Members of jury : - M. Philippe BENECH, Professeur, Université Grenoble-Alpes: Supervisor - M. Tan-Phu VUONG, Professeur, Grenoble INP : Co-supervisor - M. Jacques VERDIER, Maître de conférences, INSA de Lyon: Co-supervisor -Mme. Valérie VIGNERAS, Professeur, Institut Polytechnique de Bordeaux :Examiner - M. Bruno ALLARD, Professeur, INSA de Lyon: Examiner - M. Ke WU, Professeur, Polytechnique Montréal : Reviewer -M. Laurent CIRIO, Professeur, Université Paris-Est Marne-la-Vallée :Reviewer
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Thesis prepared in the laboratory : UMR 5130 - IMEP-LAHC (Institut de Microélectronique, Electromagnétisme, Photonique – Laboratoire Hyperfréquences et Caractérisation) supervised by Philippe BENECH , supervisor and Tan Phu VUONG , co-supervisor.