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Design Guidelines for Sensors Based on Spiral Resonators.

Mahmoud Elgeziry¹, Filippo Costa¹, Simone Genovesi¹

¹Dipartimento di Ingegneria dell'Informazione, Università di Pisa, 56126 Pisa, Italy.

Sensors (Basel, Switzerland)

|March 10, 2022

Summary

This study offers design guidelines for wireless microwave displacement sensors using spiral resonator tags. These guidelines, supported by simulations and models, aid in selecting parameters for accurate non-contact measurements.

Keywords:

displacement sensors distance sensors metamaterials microwave sensors spiral resonators

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Area of Science:

Electrical Engineering
Electromagnetics
Sensor Technology

Background:

Wireless microwave sensors offer a non-contact alternative to traditional methods.
Resonating elements are key components in these sensors, relying on resonance properties.

Purpose of the Study:

To provide design guidelines for spiral resonator (SR) based wireless displacement sensors.
To assist in the initial design phase by selecting appropriate parameters for desired applications.

Main Methods:

Utilizing electromagnetic simulations and analytical expressions to support design guidelines.
Developing a corrected equivalent circuit model for resonant frequency shifts.

Main Results:

The sensor's performance is influenced by SR tag dimensions, filling factor, turns, and probing loop size.
Guidelines facilitate preliminary parameter selection for SR displacement sensors.

Conclusions:

The proposed guidelines, validated by simulations and experiments, enable effective design of SR displacement sensors.
A corrected equivalent circuit model accurately accounts for resonant frequency shifts at small distances.