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Technical Notes > Radiated Fields > Antenna Parameters
Peak Directivity
Directivity is defined as the ratio of an antenna’s radiation intensity in a given direction to the radiation intensity averaged over all directions. Peak directivity, in turn, is the maximum directivity over all the user-specified directions of the far-field infinite sphere.
Directivity is a dimensionless quantity represented
by
where
|
|
(1) |
• U
is the radiation
intensity in watts per steradian in the direction specified.
• Prad
is the radiated
power in watts.
Note |
The peak directivity displayed in the Antenna Parameters window is the directivity in the direction of maximum radiation intensity, Umax. |
• For a lossless antenna, the directivity will be equal to the gain. However, if the antenna has inherent losses, the directivity is related to the gain by the radiation efficiency of the antenna.
Related Topics
Setting up a Far-Field Infinite Sphere
Computing Antenna Parameters
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