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Scattering of Microwaves by a Passive Array Antenna Based on Amorphous Ferromagnetic Microwires for Wireless Sensors with Biomedical Applications

1
Instituto de Magnetismo Aplicado, Universidad Complutense de Madrid-ADIF-CSIC, P.O. Box, 155, Las Rozas, 28230 Madrid, Spain
2
Departamento de Física de Materiales, Universidad Complutense de Madrid, 28040 Madrid, Spain
3
IMDEA Nanociencia, C/Faraday 9, 28049 Madrid, Spain
4
Donostia International Physics Center (DIPC), 20018 San Sebastián, Spain
*
Author to whom correspondence should be addressed.
Sensors 2019, 19(14), 3060; https://doi.org/10.3390/s19143060
Received: 10 June 2019 / Revised: 8 July 2019 / Accepted: 9 July 2019 / Published: 11 July 2019
(This article belongs to the Special Issue Non-Invasive Biomedical Sensors)
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Abstract

Co-based amorphous microwires presenting the giant magnetoimpedance effect are proposed as sensing elements for high sensitivity biosensors. In this work we report an experimental method for contactless detection of stress, temperature, and liquid concentration with application in medical sensors using the giant magnetoimpedance effect on microwires in the GHz range. The method is based on the scattering of electromagnetic microwaves by FeCoSiB amorphous metallic microwires. A modulation of the scattering parameter is achieved by applying a magnetic bias field that tunes the magnetic permeability of the ferromagnetic microwires. We demonstrate that the OFF/ON switching of the bias activates or cancels the amorphous ferromagnetic microwires (AFMW) antenna behavior. We show the advantages of measuring the performing time dependent frequency sweeps. In this case, the AC-bias modulation of the scattering coefficient versus frequency may be clearly appreciated. Furthermore, this modulation is enhanced by using arrays of microwires with an increasing number of individual microwires according to the antenna radiation theory. Transmission spectra show significant changes in the range of 3 dB for a relatively weak magnetic field of 15 Oe. A demonstration of the possibilities of the method for biomedical applications is shown by means of wireless temperature detector from 0 to 100 °C. View Full-Text
Keywords: magnetic; amorphous; microwires; wireless; biosensor; microwaves; giant magnetoimpedance; scattering magnetic; amorphous; microwires; wireless; biosensor; microwaves; giant magnetoimpedance; scattering
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Moya, A.; Archilla, D.; Navarro, E.; Hernando, A.; Marín, P. Scattering of Microwaves by a Passive Array Antenna Based on Amorphous Ferromagnetic Microwires for Wireless Sensors with Biomedical Applications. Sensors 2019, 19, 3060.

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