ZyXEL N4100 Guia Do Utilizador

Appendix D Wireless LANs

N4100 User’s Guide

• Omni-directional antennas send the RF signal out in all directions on a horizontal 

plane. The coverage area is torus-shaped (like a donut) which makes these 

antennas ideal for a room environment. With a wide coverage area, it is possible 

to make circular overlapping coverage areas with multiple access points. 

• Directional antennas concentrate the RF signal in a beam, like a flashlight does 

with the light from its bulb. The angle of the beam determines the width of the 

coverage pattern. Angles typically range from 20 degrees (very directional) to 

120 degrees (less directional). Directional antennas are ideal for hallways and 

outdoor point-to-point applications.

In general, antennas should be mounted as high as practically possible and free of 
obstructions. In point-to–point application, position both antennas at the same 
height and in a direct line of sight to each other to attain the best performance. 

For omni-directional antennas mounted on a table, desk, and so on, point the 
antenna up. For omni-directional antennas mounted on a wall or ceiling, point the 
antenna down. For a single AP application, place omni-directional antennas as 
close to the center of the coverage area as possible. 

For directional antennas, point the antenna in the direction of the desired 
coverage area.