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Assembly-Line-Compatible Electromagnetic Characterization of Antenna Substrates for Wearable Applications using Polynomial Chaos

: Deckmyn, T.; Rossi, M.; Agneessens, S.; Rogier, H.; Ginste, D.V.


Institute of Electrical and Electronics Engineers -IEEE-; IEEE Microwave Theory and Techniques Society:
IEEE MTT-S International Conference on Numerical Electromagnetic and Multiphysics Modeling and Optimization, NEMO 2018 : 8-10 August 2018, Reykjavik, Iceland
Piscataway, NJ: IEEE, 2018
ISBN: 978-1-5386-5204-6
ISBN: 978-1-5386-5203-9
ISBN: 978-1-5386-5205-3
International Conference on Numerical Electromagnetic and Multiphysics Modeling and Optimization (NEMO) <5, 2018, Reykjavik>
Conference Paper
Fraunhofer IZM ()

For the design and production of reliable devices applied in wearable components, characterization of the electromagnetic properties of materials is of paramount importance. Therefore, we propose a novel approach, based on a resonance-perturbation method, which compares simulations and performed measurements. An inset-fed patch antenna with a resonance frequency in the vicinity of the 2.45-GHz Industrial, Scientific, and Medical band enables us to quickly estimate the characteristics of a given material sample. In a first step, the two frequencies for which the simulated return loss of the fixture crosses a defined threshold are modeled as polynomial functions of the relative permittivity and loss tangent of the material under test. Then, the electromagnetic properties of the material are obtained by comparing the modeled and measured frequencies. The electromagnetic properties of several textile materials of interest are determined with this method. It is shown that the proposed technique is fast, precise, and nondestructive. Owing to this, it is suitable for integration into an assembly line, where substrate samples are straightforwardly characterized before being used for the manufacturing of actual antennas.