An In Vitro Experimental System for 5G 3.5 GHz Exposures

Authors: Y. S. Lee, S. B. Jeon, J. -K. Pack, N. Kim, H. -D. Choi

Year: 2022

Category: Experimental Physics

Journal: IEEE Access

Institution: IEEE Access

DOI: 10.1109/ACCESS.2022.3204055

URL: https://ieeexplore.ieee.org/document/9875270

Abstract

Overview

This study details the development of an in vitro experimental system specifically designed for 5G at 3.5 GHz frequency exposures using a radial transmission line housed inside an incubator for consistent propagation conditions.

System Components & Working

  • A conical antenna centered within a radial transmission line to preserve field symmetries.
  • 5G signal generator and a custom power amplifier for creating new radio time division duplex waveforms.
  • A feedback scheme involving a directional coupler and power meter to monitor and adjust output power.

Experimental Evaluation

The experimental setup's efficiency is assessed through temperature measurements and nonlinear curve fitting methods to determine the specific absorption rate (SAR values). The outcomes indicate effective control over variables like output power, water temperature, incubator air temperature, and CO2 density critical for precise in vitro experimentation.

Findings

Comparison between SAR values from a maximum power "worst-case" signal and a genuine 5G TDD transmission shows a close resemblance between the observed initial slope ratio and the theoretical duty cycle, underscoring the system's reliability and effectiveness in simulating realistic 5G exposure scenarios.

5G in vitro SAR 3.5 GHz exposure assessment temperature control power control
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