Radiation pattern, 2-D visualization

AN3359

14/28

Doc ID 018585 Rev 1

5

Radiation pattern, 2-D visualization

In this chapter all radiation patterns are related to the magnitude of electrical far field E,

which is normalized and shown in the logarithmic scale (in dB). This means that the

maximum global radiation pattern (maximum magnitude of the electrical far-field E) is

represented by 0 dB level. To show antenna radiation patterns in detail, three two

dimensional (2-D) major cuts are presented. Consider the orientation of the module in the

spherical coordinate system as shown in Figure 1.

A three dimensional (3-D) far field radiation pattern is visualized as three two dimensional

(2-D) cuts through a 3-D pattern. Three major planes are used for these cuts (Figure 12):

●

One horizontal X-Y plane

●

Two vertical planes: X-Z plane and Y-Z plane.

For the colors of the plots in Figure 12:

●

The "Blue" plot is drawn on the horizontal X-Y plane, where azimuth

φ radiates from 0°

on the X-axis towards the Y-axis until it reaches 360° on the X-axis.

●

The "Red" plot is drawn on the X-Z plane, where elevation

θ radiates from 0° on the Z-

axis towards the positive part of the X-axis until it reaches180° on the negative part of

the Z-axis. In this plot (cut by X-Z plane), elevation

θ is negative for X < 0.

●

The "Green" plot is drawn on the Y-Z plane, where elevation

θ radiates from 0° on the

Z-axis towards the positive part of the Y-axis until it reaches 180° on the negative part

of the Z-axis. For this plot (cut by Y-Z plane), elevation

θ is negative for Y < 0.