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How to find iso contours at xdbm in an antenna ?

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ekomninos

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iso contours

Hi,

Supposing that i had an antenna (RF), how can i find the iso-contour at xdbm?(theory)
 

iso contours

The antenna is a linear device so you only need to know the pattern. So if you feed it with 0 dBm then the -3dB gain contour will 3 dB down from the power a the same distance from an isotropic antenna. The contour would be on a plane orthogonal to the vector of peak gain.
 

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