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Near field measurements

 
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antenna_student
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Joined: 16 Mar 2017
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PostPosted: Thu Mar 16, 2017 3:38 pm    Post subject: Near field measurements Reply with quote

Hello,i'm working on a project for school for antenna course,knowing the Er,Etheta and Ephi ( modulus and phase) for a plane in a fixed distance Z,i have to extract the Ex and Ey. i'm a bit confused on how to do that?is a simple spherical to cartesian transformation enough?
Thank you in advance
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e.fannio
Antenna Theory Regular


Joined: 12 Jul 2018
Posts: 10
Location: Naples, Italy

PostPosted: Fri Jul 13, 2018 1:00 pm    Post subject: Re: Near field measurements Reply with quote

antenna_student wrote:
Hello,i'm working on a project for school for antenna course,knowing the Er,Etheta and Ephi ( modulus and phase) for a plane in a fixed distance Z,i have to extract the Ex and Ey. i'm a bit confused on how to do that?is a simple spherical to cartesian transformation enough?
Thank you in advance


Yes, it is.
Ex = Er*sin(theta)*cos(phi) + Eth*cos(theta)*cos(phi) - Ephi*sin(phi)
Ey = Er*sin(theta)*sin(phi) + Eth*cos(theta)*sin(phi) + Ephi*cos(phi)
Ez = Er*cos(theta) - Eth*sin(theta)
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