Abstract
This paper intends to give a code about atmospheric propagation effects affecting terahertz (THz) communication system. The main focus is on attenuation caused by atmospheric gases with the radiation transmission theory and the empirical continuum absorption based on the HITRAN database. Theoretical aspects about them are presented, emphasizing on those which deserve special attention as frequency increases. Laboratory measurements of the absorption spectra of laboratory air and major atmospheric gases mixed with water vapor in the 250 - 350 GHz frequency range at atmospheric pressure and room temperature on a basis of backward wave oscillators (BWOs) are obtained. The results of experiments are compared with the calculations. It is found that the water vapor transmittance is greater than the calculation. Data of these measurements agree with the results of analysis of atmospheric spectra with in statistical accuracy of experiments. Accurate measurements are also needed for further studies of the physics of the molecules and their interactions. The investigation makes it significant for enhancing accuracy of models of radiation propagation in the atmosphere.
Highlights
THz radiation has been found more and more application owing to its interesting properties
The backward-wave oscillator (BWO, Microtech Instruments QS1-370) used as the source generates a continuous essentially monochromatic THz wave at a frequency that can be controlled in the case of our source in the approximate range of 0.22 - 0.37 THz by the high voltage applied to the electrodes of its internal tube
As a result of this, the new model of this paper has been jointly developed with the previous model, which is valid at frequencies up to 10 THz based on high-resolution transmission molecular absorption database (HITRAN) database
Summary
THz radiation has been found more and more application owing to its interesting properties. The atmospheric propagation of THz waves depends on a large of extent on the molecular absorption by oxygen and water vapor. A large amount of papers are devoted to experimental investigation of water vapor absorption in the terahertz regime [3] [4]. In order to test and further improve the knowledge on atmospheric propagation at THz frequencies, it is extremely important to have experimental data on the special transmission windows. The measurements of terahertz atmospheric transmission in the range of 250 - 350 GHz frequency are carried out by BWOs under known conditions of path length, temperature, and pressure. The atmospheric absorption coefficient values are calculated using the radiation transmission model, and compared with the experimental data in the frequency region
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