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  Technical Notes > Radiated Fields > Antenna Parameters           

Peak Gain

Gain is four pi times the ratio of an antenna’s radiation intensity in a given direction to the total power accepted by the antenna. Peak gain, in turn, is the maximum gain over all the user-specified directions of the far-field infinite sphere.

The following equation is used to calculate gain in HFSS:

 

 

(1)

where

• U is the radiation intensity in watts per steradian in the direction specified.

• Pacc is the accepted power in watts entering the antenna.

Gain can be confused with directivity, since they are equivalent for lossless antennas. Gain is related to directivity by the radiation efficiency of the antenna. If the radiation efficiency is 100%, they are equal.

Note

Because the gain is calculated from the input signal at the port, a port must be defined for this quantity to be displayed.

Related Topics

Setting up a Far-Field Infinite Sphere

Computing Antenna Parameters

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