Compute the attenuation spectrum from 1 to 1000 GHz for an atmospheric pressure of 101.300 kPa and a temperature of C. Plot the spectrum for a water vapor density of 7.5 and then plot the spectrum for dry air (zero water vapor density).
Based on empirical study, this paper proposes an enhancement to the path loss model in the indoor environment for improved accuracy in the relationship.
Set the attenuation frequencies.
Assume a 1 km path distance.
Compute the attenuation for air containing water vapor.
Compute the attenuation for dry air.
Plot the attenuations.
Plot Attenuation Due to Atmospheric Gases and Free Space
First, plot the specific attenuation of atmospheric gases for frequencies from 1 GHz to 1000 GHz. Assume a sea-level dry air pressure of 101.325e5 kPa and a water vapor density of 7.5 . The air temperature is C. Specific attenuation is defined as dB loss per kilometer. Then, plot the actual attenuation at 10 GHz for a span of ranges.
Plot Specific Atmospheric Gas Attenuation
Set the atmosphere temperature, pressure, water vapor density.
Set the propagation distance, speed of light, and frequencies.
Compute and plot the atmospheric gas loss.
Plot Actual Atmospheric and Free Space Attenuation
Compute both free space loss and atmospheric gas loss at 10 GHz for ranges from 1 to 100 km. The frequency corresponds to an X-band radar. Then, plot the free space loss and the total (atmospheric + free space) loss.