how to find out the Co and cross polarization of the corrugated horn using hfss

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DIVYAROLI

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hey i m attaching ma corrugated horn antenna design along wid reults....
pls any1 let me what is the level of cross n co polar polarization...
 

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  • corrugated horn.rar
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you can set up an additional radiation far field setup which covers only a short section (say -10<theta<10) and compute antenna parameters over this region. i got the following results for your model. was the relationship between the magnitudes or rEx and rEy what you were looking for ?
 
i want to know, how i should find out the cross polarization level of dis corrugated horn antenna using HFSS...
 

Linear polarization for your antenna is achieved along the X axis.

At boresight, dB(GainX) = 20 dB
The cross polarization to this will be dB(GainY) = -24 dB

So the cross pol level is around -44 dB which is very good *.

*note: I have not solved or checked your model for validity. I have merely interpreted the results provided in the attachment.
 
I am also working on corrugated horn antenna and I am getting co-pol(gainx) +20 dB and cross pol(gainy) -18 dB. But, problem is that I am getting peak in cross pol at boresight. Can you help me in finding reason for the same?
 

hey as i m interested in to test the cross and copolar level when corrugated antenna is verticaly polarised and horizontally polarized both.....
and how did u know it is lineraly polarized in X direction.....
 

Anuj_Modi said:
I am also working on corrugated horn antenna and I am getting co-pol(gainx) +20 dB and cross pol(gainy) -18 dB. But, problem is that I am getting peak in cross pol at boresight. Can you help me in finding reason for the same?
Click to expand...

Hi

I did not see this post till now.

As long as there is a large difference between co-pol and cross-pol, it should be fine. It is common to find a small peak at boresight for the cross-pol also. It depends on your antenna design and we cannot make any guesses without talking specifics.

- - - Updated - - -

DIVYAROLI said:
hey as i m interested in to test the cross and copolar level when corrugated antenna is verticaly polarised and horizontally polarized both.....
and how did u know it is lineraly polarized in X direction.....
Click to expand...

X, Y are just names labels given to the different axes. In your setup, the E-field vectors were all pointing and oscillating only along the X direction (thus linearly polarized along X).

This can also be seen through the component of E-field vector being maximum along X. (i.e. rEx >> rEy and rEx >> rEy at the far field observation point)
 
hey as i am new and dnt have much experience with hfss.....
Will u help me how to change the E field vectors to Y directions ...so
 

One simple way is to rotate your input setup by 90 deg about the Z axis.

Then your modes will now also change their alignment and you will get the opposite linear polarization. (i.e. E aligned along Y)
 
In the given design,corrugated horn is excited using circular wveguide which is excited using waveport and the number of modes used is 2 in +X and +Y direction,so how i could rotate my input setup in HFSS
 

 

 
 

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