التوهين الجوي للموجات الدقيقة بواسطة الاوكسجين وبخار الماء

The knowledge of attenuation happening to the microwaves in troposphere layer have many and important interests in many fields such as telecommunications and meteorology field. We can study this attenuation by many of atmospheric constituents such as oxygen and water vapor at changing some of atmospheric parameters (temperature , relative humidity and atmospheric pressure). The results showed that the happening attenuation by water vapor be larger than oxygen and this value have been increasing by the increasing of temperature in compare with other parameters (relative humidity , atmospheric pressure), have minor effects , and the larger attenuation value by water vapor at frequency (326 GHz) at temperature (50 °C), relative humidity (60 %) and atmospheric pressure (1013.25 hpa)and least values for the other parameters. Larger attenuation value be at frequency (63 GHz)and this value never be affected by the effect of the used atmospheric parameters values. While the total attenuation reached a larger value at frequency (97 GHz) at temperature (50 °C), relative humidity (60 %) and atmospheric pressure (1013.25 hpa) and total minimum was at temperature (20 °C), relative humidity (10 %) and atmospheric pressure (1013.25 hpa).