Atmospheric ducting is an atmospheric refraction effect on electromagnetic waves formed under specific weather conditions. Accurate forecasting of its propagation loss is of great importance in modern ...

Near-surface wave propagation at microwave frequencies, especially 2 GHz and above, shows significant dependence on atmospheric ducts that are the layer in which rapid decrease in the refractive index ...

Who this is for All HVAC systems use filters in the return section of the ductwork, which sends indoor air back to the air handler for reconditioning.