[PhasedArrayToolbox] IsotropicAntenna directivity issue

Question

Vitaly Krepak 2015-3-17

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https://ww2.mathworks.cn/matlabcentral/answers/183697-phasedarraytoolbox-isotropicantenna-directivity-issue

评论： Vitaly Krepak 2015-3-18

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

Could anybody explain this? Thank you.

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Answer 1

Honglei Chen 2015-3-18

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https://ww2.mathworks.cn/matlabcentral/answers/183697-phasedarraytoolbox-isotropicantenna-directivity-issue#answer_171762

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.