Because an antenna works in the real environment, it usually sees many manmade and natural sources of background noise like a thermal
noise from the ground, cosmic noise, sun, lightnings, discharges and so on.
So that the microwave power delivered to the radio will be the desired signal and noises collected from various sources.
Noise may be received through the main beam of the antenna pattern and through sidelobes. We have a very little chance to
suppress noises received through the main beam, but we can to control the level of highly undesired sidelobes.
The series of RSLL antennas have the sidelobes level reduced by no less than a 20dB compared to the main beam.
It means that the RSLL antenna will receive much less noise and undesired microwave power from other WLAN subscribers than a standard antenna.
