A planar, low-cost, and flexible microwave sensor is introduced, utilizing an electromagnetic metasurface of frequency-selective surface (FSS) type. This sensor concept relies on altering the inter-plate capacitance of the electric inductive-capacitive (ELC) resonators forming the FSS periodic array grid. When a material with varying electrical characteristics is placed between the plates, changes in capacitance and inductance lead to a shift and attenuation of the resonant frequency that are exploited as encoding mechanism for the sensing functionality. The metasurface approach offers the advantage of enhancing the sensor's radar cross section (RCS), which in turn improves either the reading distance or the strength of the sensor response.
Microwave Sensing of Humidity with a Transparent and Flexible Electromagnetic Metasurface
Marchi, G.
;Mulloni, V.;Gaiardo, A.;Valt, M.;Facchinelli, T.;Lorenzelli, L.
2025-01-01
Abstract
A planar, low-cost, and flexible microwave sensor is introduced, utilizing an electromagnetic metasurface of frequency-selective surface (FSS) type. This sensor concept relies on altering the inter-plate capacitance of the electric inductive-capacitive (ELC) resonators forming the FSS periodic array grid. When a material with varying electrical characteristics is placed between the plates, changes in capacitance and inductance lead to a shift and attenuation of the resonant frequency that are exploited as encoding mechanism for the sensing functionality. The metasurface approach offers the advantage of enhancing the sensor's radar cross section (RCS), which in turn improves either the reading distance or the strength of the sensor response.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
