Aruba Networks AP85FXLX Benutzerhandbuch

| Understanding Antennas

Aruba AP-85 Outdoor Access Point Series | Installation Guide

Traditional 2-D pattern plots and beamwidth specifications are like mental puzzles waiting to be solved because they only 
provide a snapshot of the information in two planes. These two planes are often referred to as the azimuth (H-plane or 
horizontal) and elevation (vertical or E-plane) planes. The azimuth view would be considered the view from directly above, 
viewing the antenna pattern on the horizontal plane. The elevation view is considered to be a side view, viewing the antenna 
pattern on the vertical plane. It is helpful to think of these planes as “cuts” of the real antenna pattern, which is actually 3-D. 

Figure 27

 illustrates where these “cuts” are located for a typical omni-directional antenna pattern.

Figure 27  Antenna Pattern Conventions (Omni-Directional Pattern Shown)

The antenna illustrated by 

Figure 27

 is commonly referred to as the dipole pattern because it is the pattern produced by an 

ideal dipole antenna. The gain of this antenna is 2.14, which is achieved by compression in the vertical plane (elevation) 
compared to the ideal sphere. If referring to the true 3D pattern, this compression is sometimes called the donut shape (see 

Figure 28

).

Figure 28  Donut Shape Compression of an Omni-Directional Antenna