[PhasedArrayToolbox] IsotropicAntenna directivity issue

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Hello. I don't understand behaviour of directivity function for IsotropicAntenna from Phased Array Toolbox (Matlab R2014b). I supposed, that for Isotropic Antenna its directivity D(phi, theta) = const = 1 = 0 dBi. But in Documentation Center's example D = const = 0.1102e-3. That's the code:
myAnt = phased.IsotropicAntennaElement();
ang = [-30,-20,-10,0,10,20,30; 0,0,0,0,0,0,0];
freq = 1e9;
d = directivity(myAnt,freq,ang)
Output
d =
1.0e-03 *
0.1102
0.1102
0.1102
0.1102
0.1102
0.1102
0.1102
Could anybody explain this? Thank you.

Accepted Answer

Honglei Chen
Honglei Chen on 18 Mar 2015
Hi Vitaly,
You are right that the theoretical vale is 0 dBi. The directivity computation in this case is done using numerical integration with one degree spacing in both azimuth and elevation directions so the result is not exact.

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