Front to back ratio is an important characteristic of directional antenna antenna. Is the ratio of power radiated from a corner with maximum radiation radiation levels at 180 degrees (the back of) from that point. Front to back the ratio is usually expressed in terms of dB, i.e. the signal at the rear of the antenna must be X DB down from the signal to the mirror, the angle of the antenna. It's recommend directional antenna used in the system must have a front back ratio of more than 25 DB. Use of the aerial system design with adequate front back ratio helps to reduce the amount of interference that will be produced in the system.
Field measurements showed a general phenomenon where the back scatter the deputies located and alternate channel related sectors reflects off the Earth in turmoil The front of these related sectors and distribute back to the coverage areas of the best services sector near the site.
This effect is only equal to the serving sector (within 100 meters or less). Interference power limits the best serving the branch's ability to to achieve the CINR values greater than 25 decibels in these areas. Each sector on the website
effectively makes this form of interference backscatter for all other sectors same site.
This interference energy is not coming from the rear cross-sector antenna and therefore does not create additional interference away from the site on edge cover the best of the service sector. Although no intervention from the back of the antenna, but caused by the reflection, modeling of RF exposure prediction tools (one not based on Ray tracing), front to back ratio can be reduced (i.e. not having the back of a weakened) as a way to increase the signal level modeling What is observed from reflections.