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Scattering of microwaves by a passive array antenna based on amorphous ferromagnetic microwires for wireless sensors with biomedical applications



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Moya, Alberto and Archilla Sanz, Diego and Navarro Palma, Elena and Hernando Grande, Antonio and Marín Palacios, María Pilar (2019) Scattering of microwaves by a passive array antenna based on amorphous ferromagnetic microwires for wireless sensors with biomedical applications. Sensors, 19 (14). ISSN 1424-8220

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Official URL: http://dx.doi.org/10.3390/s19143060


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 degrees C.

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© 2019 by the authors. Licensee MDPI
This work has been supported by the Ministerio Español de Economia y Competitividad (MINECO) MAT2015-67557-C2-1-P, MAT2017-91935-EXP, FIS2016-76058; S2013/MIT-2850 NANOFRONTMAG, S2018/NMT-4321 NANOMAGCOST. RTI2018-095856-B-C21.

Uncontrolled Keywords:Giant-magnetoimpedance; Impedance; Glass; Soft; Magnetic; Amorphous; Microwires; Wireless; Biosensor; Microwaves; Scattering
Subjects:Sciences > Physics > Materials
Sciences > Physics > Solid state physics
ID Code:57233
Deposited On:17 Oct 2019 18:41
Last Modified:18 Mar 2020 19:26

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