Controller Based WLANs

What is an antenna pattern plot?

by on ‎07-02-2014 06:20 PM

Product and Software: This article applies to all Aruba controllers and ArubaOS versions.

 

An antenna pattern plot is a 2-D (two dimensional) representation of the actual 3-D (three dimensional) radiating pattern of an antenna.

All antennas radiate energy in 3-D space. For simplicity, and almost since the beginning of the invention of the antenna, the radiating pattern of antennas has been represented by 2-D plots, called "pattern plots." These plots represent 2-D planar slices of the actual 3-D radiating pattern at two very specific locations through the center of the antenna; the Horizontal Plane, or "H-plane" and the Elevation Plane or "E-plane."

Since most people are familiar with 2-D representations of 3-D objects when dealing with building construction, the "H-plane" would be the same as the "top view" or "floor plan" view of an architectural drawing. The "E-plane" would correspond to the "elevation view" or side view of a building. Similar to a building floor plan, the "plane" for the floor plan and elevation views must be selected. In the case of a building floor plan, the plane selected corresponds to the "floor" that is of interest. In the case of the building elevation drawing, this is usually selected through the center of the building at some other plane or face to show the structural details of interest such as supporting floor joists, pillars, and rafters.

For an antenna, the planes selected are right through the center of the radiating structure. In this sense, the "H-plane" plot can be considered the view of the radiating pattern when looking down from above (similar to a floor plan view) and the "E-plane" plot can be considered the "side view" of the antenna pattern. In both cases, the antenna is located in the center, or origin, of the E-plane and H-plane pattern plots.

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