Resonant transmittance model for millimeter wave propagation

Well-established infrared modeling techniques are extended into the millimeter wave region in order to develop an analytically and computationally simple model for resonant absorption. The adopted model consists of an exponential function whose defining parameters are determined through curve-fitting to high resolution transmittance data. An application is made to water vapor and oxygen at 1-GHz intervals from 30 to 300 GHz using line-by-line monochromatic transmittance data, thereby testing the proposed methodology. With data for the bottom five kilometers of the atmosphere, the resulting model yielded an overall standard transmittance deviation of 0.08 percent and 0.66 percent for water vapor and oxygen, respectively.