Fig. 3From: Methodology: non-invasive monitoring system based on standing wave ratio for detecting water content variations in plantsStanding wave ratio (SWR) changes for experimental plants Ficus benghalensis, Dypsis lutescens, and Salvia Rosmarinus. SWR measurement of the coil probe was performed using a network analyzer under various experimental conditions, and the frequency was measured at 1.0–2.0 GHzBack to article page