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Antenna complex radiation pattern

 
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AliHAZ
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Joined: 22 Aug 2016
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PostPosted: Mon Aug 22, 2016 7:23 am    Post subject: Antenna complex radiation pattern Reply with quote

A basic question regarding the interpretation of measured antenna radiation pattern data.
Usually the measured antenna radiation pattern data includes the Phi , Theta angles and Ephi_amplitude, Etheta_amplitude and their corresponding phases for each Phi and Theta angles.

When we refer to complex antenna pattern ( that we usually plot in 3D spherical coordinates) are we meaning the Etotal = Ephi(complex) + Etheta(complex), where Ephi(complex) = Ephi_amplitude*exp(j*Ephi_phase)? or something else?

I am planning to use the measured antenna pattern data in a channel emulator that try totake the effect of the antenna into account, so I want to use the given data regarding the pattern correctly.

Thank you for your help
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admin
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PostPosted: Thu Aug 25, 2016 12:25 am    Post subject: Reply with quote

If a radiation pattern is given with no description, then it is a measure of

Etotal = sqrt( Ephi^2 + Etheta^2 ), where Ephi and Etheta are linear units (not in dB)

If you want an accurate channel model that fully takes into account polarization and phase for each angle, you do have to use Ephi_complex and Etheta_complex
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AliHAZ
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Joined: 22 Aug 2016
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PostPosted: Fri Aug 26, 2016 1:14 pm    Post subject: Reply with quote

Thanks! That was very helpful.
Can you please illustrate what you meant by 'if radiation pattern is given with no description'
For instance in my case i know that the measurement was for a comercial mobile phone and the measurement data i have include :
Phi Theta
E(Phi). Real part E(Phi). Imaginary part
E(Theta). Real part E(Theta). Imaginary part
E Total. dB E Total. Lin
Gain Phi. dB Gain Phi. Lin
Gain Theta. dB Gain Theta. Lin
Gain . dB Gain . Lin
E(Phi) . Amp lin E(Theta) . Amp lin
E(Phi) . Amp dB E(Theta) . Amp dB
E(Phi) . Phase E(Theta) . Phase

from these data i can ofcourse easily form the complex pattern.
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