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ETheta and EPhi

 
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mprathap



Joined: 27 Apr 2007
Posts: 25
Helped: 1
Post27 Aug 2008 23:23   ETheta and EPhi
I measured the horizontal and vertical polarized components of an antenna. How do I relate this to theta and phi components of the electric field. I figured it out to be as vertical component = theta component and horizontal component = phi component. But when I compared it with simulated results from HFSS it turns out to be the other way around. i.e., vertical = phi and horizontal = theta.

I gave a lot of thought on this, and after researching through Google, and going back to some basic vector field algebra, it is not still quite clear to me.

Any help would be greatly appreciated.
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Element7k



Joined: 07 May 2003
Posts: 388
Helped: 8
Post28 Aug 2008 0:00   Re: ETheta and EPhi
Hi mprathap,

it may help when drawing your antenna to align your antenna's main electric fields vector in the Z-direciton and the orthogonal field in the xy plane. Try a simple dipole for a start. Hope it helps.

Rgz,
E7k
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GVVIN



Joined: 11 Apr 2008
Posts: 103
Helped: 17
Post28 Aug 2008 5:18   Re: ETheta and EPhi
see attached
theta and phi in Spherical co ordinate system

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demian1977



Joined: 10 Jun 2006
Posts: 16
Post28 Aug 2008 15:06   Re: ETheta and EPhi
Antenna orientation in a reference systems is arbitrary. You should orientate the antenna when you mesure it and in HFSS in the same way.

Don' confuse the angle beetwen axes x,y,z and versor theta and phi.
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