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Printed electronics on 2D and 3D thermoplastics for radio frequency applications

Published on May 25, 2022
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PhD Defense April 6, 2022

Camille Delfaut, LGP2's doctoral student, defended her thesis: "Integration of printed electronics capabilities on 2D and 3D thermoplastics for radiofrequency implementations".

This doctoral thesis was prepared at the Université Grenoble Alpes under the supervision of Nadège Reverdy-Bruas, HDR Lecturer (Grenoble INP-Pagora / LGP2) and the co-direction of Professor Tan Phu Vuong (Grenoble INP-Phelma / IMEP-LAHC). The thesis was co-supervised by Denis Curtil, Lecturer-researcher (Grenoble INP-Pagora / LGP2).

Camille Delfaut has presented her research results entitled Integration of printed electronics capabilities on 2D and 3D thermoplastics for radiofrequency implementations.

This thesis is part of an Industrial Excellence Chair research program named MINT (innovating for molded & printed electronics), initiated in September 2015. MINT was supported by Grenoble INP Foundation and sponsored by Schneider Electric which has committed with two research laboratories, LGP2 and IMEP-LAHC, so that to develop electronic functionalities on 3D thermoplastics.

Goal of the thesis: to develop an additive manufacturing process in order to functionalize three-dimensional thermoplastics in the context of the Internet of Things and therefore, in the wireless field.
The thesis is structured around three axes. First, a bibliographic study details the molded interconnect device (MID) processes and a classification of these among the mastered 3D additive manufacturing technologies is proposed. Devices produced by MID process are presented for each of the areas covered.

Then, the Jetting process and its geometrical and electrical characterization are presented. Printing parameters are studied and optimization strategies for robust printing are implemented.

Finally, through a characterization of coplanar transmission lines in 2D and 3D, the radiofrequency performances of prints by Jetting are evaluated. 2D coplanar lines are simulated and printed. Process is optimized by printing mesh ground planes. Coplanar lines are also printed on 3D substrates with 90° and 130° angles and then measured. Radiofrequency applications are then detailed on 2D and 3D substrates such as a LoRa antenna, a RFID tag and a 5G antenna radome showing the potential applications of the technology developed in field of printed antenna on 3D objects.
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Date of update May 25, 2022

Université Grenoble Alpes