Questions & Answers on RF Propagation

Why is the 60 GHz Band not good for long-range communications?

Aug 17, 2017

At 60 GHz, Oxygen molecules in the atmosphere interact with the RF signals to cause significant attenuation. Due to this attenuation the 60 GHz band is not a good frequency to use for long-range radar or communication applications. At 60 GHz O2 can cause an attenuation of up to 10 dB/km.As we go higher up in frequency gasses in the atmosphere start to react with RF Signals causing attenuation. As ...read more

What is the Impact of the Atmosphere on RF Signal Propagation?

RF Basics RF Propagation

Editorial Team

Aug 17, 2017

As we go higher up in frequency, the earths atmosphere starts to impact the propagation of RF signals. RF signals travelling in free space are effected by atmospheric attenuation. This attenuation in the atmosphere is caused mainly by signal absorption by gasses such as O2 and H2O. The effect of signal absorption under 10 GHz is fairly low and predictable, however as we go higher in frequency (spe...read more

What is the Impact of Rain on RF Signal Propagation?

RF Propagation

Editorial Team

Aug 17, 2017

As we go higher up in frequency the intensity of precipitation or rain starts to have a significant effect on atmospheric attenuation. In addition to the the signal being absorbed by the atmosphere at particular frequencies, raindrops are roughly the same size as the radio wavelengths at higher frequencies which result in the scattering of RF signals which is a major cause of attenuation.This figu...read more

What is the Fresnel Zone?

RF Basics RF Propagation

Editorial Team

May 22, 2018

In point to point wireless communications, it is important for the line of sight between two wireless systems to be free from any obstruction (terrain, vegetation, buildings, wind farms and a host of other obstructions). As any interference or obstruction in the LOS can result in a loss of signal.While installing a wireless communication system, it is important to keep an elliptical region between...read more

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