Microwave penentration depth?

[morteza]

hi. plz you for me. how is penetrate wave sentinel to under earth surface ? good luck.

[ABraun]

It ranges from centimeters (short wavelengths) to decimeters (at best for long wavelengths) but only in very dry materials.

source: https://www.researchgate.net/publication/317486898_In-Situ_Measurement_of_Soil_Permittivity_at_Various_Depths_for_the_Calibration_and_Validation_of_Low-Frequency_SAR_Soil_Moisture_Models_by_Using_GPR