MIMO Antenna in Handset - How to plot MEG & ECC in CST or HFSS

[khaled.ayman]

Hi everyone,

I'm investigating a 2x2 MIMO antenna on a mobile handset, I need to plot on CST the mean effective gain (MEG) & envelope correlation coefficient (ECC), two very important parameters which can evaluate the diversity characteristics and MIMO performance of a mobile antenna system.

The paper I refer to is titled:
"A Novel Quad-Band Diversity Antenna for LTE and Wi-Fi Applications with High Isolation" and the curves I need look like this:

 

[khaled.ayman]

Any help on this would be appreciated, I'm trying to plot the above two curves in CST. Thanks!

 

[bhaskarbhu]

you can plot the ECC easily using S- parameter approach. Just write the ECC formula in HFSS output variable window and simulate it..

 

[khaled.ayman]

I've been able to get ECC already, what about MEG?

 

[khaled.ayman]

Anyone know how to simulate MEG (mean effective gain) using HFSS.

 

[haribhuit]

There are no any option to plot MEG in HFSS but you have the option to get that value of MEG by using far field data in CST MWS.:roll:

 

[khaled.ayman]

Hi haribhuit,

Thanks for your reply, can you provide more details as exactly how to do this?

No problems in simulating the far fields, but then what??

 

[eldamar]

Hi all, I am also working on the MIMO antenna project for my thesis and I am stuck on the same question. How can I write ECC formula in HFSS output variable window to obtain accurate results. I know the ECC formula as
but can't write appropriately in HFSS output window. Please help me...

 

[alibahri]

type this equation in the expression box of output variables.output variable can be accessed :HFSS>>result>>output variables

(mag(conjg(S(1,1))*S(1,2)+conjg(S(2,1))*S(2,2)))^2/((1-mag(S(1,1))^2-mag(S(2,1))^2)*(1-mag(S(2,2))^2-mag(S(1,2))^2))

then click add and done

 

[tony_lth]

#9 post have an error for missing ^2 in the first part.

 

[alibahri]

Excuse me
This is true
(mag(conjg(S(1,1))*S(1,2)+conjg(S(2,1))*S(2,2)))^2/((1-mag(S(1,1))^2-mag(S(2,1))^2)*(1-mag(S(2,2))^2-mag(S(1,2))^2))

 

[mmorsy]

Hey:
IN CST, you can go to Results---> Template based postprocessing---> select Farfield antenna properties---Diversity gain and correlation.