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How to know the cross-polarization in post-processing ?

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EdmundZheng

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ludwig the definition of cross polarization

I am very confused with the post-process in HFSS, Ethe,Ephi, cross-po...
who can help me?
Thanks a lot!
 

cross polarization arthur c. ludwig

yes i think these are some infomation in the help document . but i also can not how to see
cross-polarization in post-processing ?
 
ludwig 3rd defination for copol and crosspol

how about this,,
if u have a monopole/dipole extends along z-axis, and want to find the antenna gain

azimuthal plane,
theta = 90, phi = 0-360,
co-polarisaton: use GainZ for pattern plotting
cross-polarisation: use GainX or GainY for pattern plotting

elevation plane,
phi = 90, phi = 0-360,
co-polarisaton: use GainZ for pattern plotting
cross-polarisation: use GainX or GainY for pattern plotting
 

thanks for your reply!
but i think i still dont understand what you said.
to linear polarization, Eθ is co-pol, EΨ is cross-pol,
while to left hand circle polarization, right hand circle polarization is cross-pol.
so, how to get the cross-polarization in post-processing, especially, circle pol?
 

actually i just had a chance to take comparisons on the above settings with the measurement..
but i can't visualise why E(theta) is co-polarisation and E(phi) is cross-polarisation for linear polarisation.. any reason?
 

Sorry, I am not sure it will affect all antenna.
Look at the antenna books and you will find to infinitesimal small wire, the E component is only EΘ in far field(r»λ), so, EΘ is co-pol.
Can anyone help me to explain it? Thanks!
 

hi, i just happened to visualise the co-polar and cross-polar during my bedtime.
in the above example,

azimuth plane,
GainPhi = GainZ = co-polarised plane
GainTheta = Gain(X,Y) = cross-polarised plane

Elevation Plane,
GainTheta = GainZ = co-polarised plane
GainPhi = Gain(X,Y) = cross-polarised plane

sorry for my confusion..
 

I've checked what kyjackchan said above and here are my observations. Please give your comments also.

Cross-polarization according to HFSS:
The maximum gain (max of the radiation pattern in dB) is located at the same *ANGLE (theta or phi)* in both COPOL and CROSSPOL.

This is WRONG and cannot be verified EXPERIMENTALLY because:
....... In test-chamber, when the 2 antennas are cross-pol, the gain has to be MINIMUM. Example when the 2 dipoles, one receives, one transmits, are parallel (4 meters away), the gain is maximum, and when the 2 dipoles are 90 degrees, the gain has to be MINIMUM.
....... Maybe I'm wrong because in HFSS, I draw only *ONE* antenna, not one transmits, one receive.

What are your comments ?
 

how can you get so old post?;)

for some antennas the polarization is fixed when feed is fixed, eg: dipole, when it is placed virtically, it is virtical polarization, it also have slim honrizatal polarization, which is cross-polarization.

Edmund
 

hi
i m new user of hfss.
i am trying to view copolarization and cross polarizaton at hfss vestion 10. but i failed to do so.

HFSS>> Result>> Creat Report > ??

can anyone please help me to know/view the steps.
thank you
 

In post processing when co-polarization and crosspolarization responce are alike, we have a circular pol. antenna. If not they are linear
 

hi,EdmundZheng
it`s amazing to meet you here, can u still remember me?

Arthur C. Ludwig wrote a classic paper on the definition of cross polarization. In particular, his third definition is often used since it describes the field components that are typically measured on a far-field antenna test range.

HFSS>> Result>> Creat Report > >farfield>>L3X or L3Y(related to your model direction)

then you can get the crosspolarization field
 

can anyone help on this please

L3X or L£Y as hgc1979 said is it for cross, polarized?

then what about co. polrized?
 

when an antenna radiated( or receiver) there are two type of currents that travel on the antenna. one current that's contribute in radiation named as imaginary-part and other current named as real-part that's not contribute in the radiation. you can consider the co-polarization due to imaginary and cross-pol duo to real-part.
 

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