How Dielectric Constant Affects Radar Level Measurement (εr Table & Selection Guide)
The dielectric constant (relative permittivity, εr) of the medium determines how much of the radar signal is reflected to the antenna. Media with εr > 3.6 reflect strongly and are easy targets; low-εr hydrocarbons (typically 1.4–4.0) reflect only a small fraction of the signal and require guided-wave radar or high-frequency (80 GHz) non-contact radar for reliable
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