Electric Field Sensing with a Modified SRR for Wireless Telecommunications Dosimetry
| Autor: | Rodrigo Martin, Alejandro Villareal, F. Vazquez, S. E. Solis-Najera, Alfredo O. Rodriguez, Oscar Rene Marrufo Melendez |
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| Rok vydání: | 2021 |
| Předmět: |
Electromagnetic field
Computer Networks and Communications Physics::Optics lcsh:TK7800-8360 02 engineering and technology 01 natural sciences Imaging phantom Split-ring resonator Optics sensor Electric field 0202 electrical engineering electronic engineering information engineering Dosimetry Electrical and Electronic Engineering Patch antenna Physics dosimetry business.industry lcsh:Electronics 010401 analytical chemistry Specific absorption rate Metamaterial 020206 networking & telecommunications electric field 0104 chemical sciences Hardware and Architecture Control and Systems Engineering split ring resonator Signal Processing business SAR |
| Zdroj: | Electronics, Vol 10, Iss 295, p 295 (2021) Electronics Volume 10 Issue 3 |
| ISSN: | 2079-9292 |
| DOI: | 10.3390/electronics10030295 |
| Popis: | Split ring resonators (SRRs) have been used extensively in metamaterials, showing a strong localization and enhancement of fields, which significantly improves the sensitivity and resolution of the electromagnetic field sensors. We propose the development of an electric field sensor for 2.4 GHz industrial, scientific, and medical (ISM) band applications, by modifying the renowned SRR to contain three concentric pairs of rings. The reduced size makes the sensor affordable for experiments by inserting it in phantoms in order to measure the specific absorption rate (SAR). Power was transmitted from a patch antenna to SRR, with a varying set of distances 1&lambda 2&lambda 3&lambda or 5&lambda Experimental measurements of power were conducted with and without a cylindrical distilled-water phantom with agar (4.54%) and NaCl (0.95%). We then computed the electric and magnetic fields and the SAR using these experimental readings of power for different distances. Our sensor was able to measure power values from 20 nW to 0.3 µ W with no phantom, and 1 nW to 10 nW with a phantom, in accordance with the values reported for radiofrequency (RF) dosimetry. The sensitivity as a function of the distance determined for the specific case of a phantom was 0.3 µ W/cm. |
| Databáze: | OpenAIRE |
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