A 3.5 GHz Band RF Wireless Signal Transmission Mechanism in Various Aqueous Solutions

International Journal of Electrical and Electronics Engineering
© 2023 by SSRG - IJEEE Journal
Volume 10 Issue 8
Year of Publication : 2023
Authors : Koyu Chinen, Ichiko Kinjo
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How to Cite?

Koyu Chinen, Ichiko Kinjo, "A 3.5 GHz Band RF Wireless Signal Transmission Mechanism in Various Aqueous Solutions," SSRG International Journal of Electrical and Electronics Engineering, vol. 10,  no. 8, pp. 102-111, 2023. Crossref, https://doi.org/10.14445/23488379/IJEEE-V10I8P110

Abstract:

We investigated RF-band wireless transmission characteristics in aqueous solutions by evaluating S-parameters. Different solutions of pure water, NaCl, alcohol, and IPA were filled into a 250 mm long ABS resin capsule terminated with 50 Ω SMA electrodes. The S-parameters of S11 and S21 were measured in the frequency range from 0.1 to 7 GHz using a Vector Network Analyzer (VNA). The frequency measured at the minimum value of the S11 is approximately 3.5 GHz, which is the frequency at which most of the maximum values of S21 were measured for the different solutions and were determined by the SMA electrode structure. When a magnetostatic or an electrostatic field was applied externally to the capsule and the mechanical shape of the capsule was changed, the changes in the S-parameter of S21 were evaluated. We clarified that the drift, rotation, and vibration of the protonic polar molecules of H2O dominate the transmission of the RF wireless signal in the aqueous solutions, and the impedance matching between the SMA electrode and pure water determines the transmission frequency.

Keywords:

Solution RF-wireless communication, Underwater wireless communication, S-parameter, VNA, Polar molecule water.

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