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Windscreen solution on a car

User: "Sra"
Sra
Altair Community Member
Updated by Sra

Hello,

 

I was simulating a windscreen antenna in FEKO using windscreen solution and I got the results as I expected. I used a plane wave as a source and calculated the currents at the windscreen antenna by placing a wire port between two wires.  But when I introduce a CAR into the model, and simulate the windscreen antenna along with the car then I do have different results. I am not sure why?

 

I performed the same process in other tool (CST) and I got the results what I expected. But in FEKO they are different. I am not sure whether I need to consider any special settings in case a car model is introduced in FEKO. Could you please give me any suggetsions ?

 

 

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    User: "Johan_Huysamen"
    Johan_Huysamen
    Altair Employee
    Updated by Johan_Huysamen

    Hi Sra

    Could you please clarify:

    1. With FEKO you are seeing different results for the currents induced on the windscreen wires with and without the car included in the model?
    2. With CST you are seeing the same results with and without the car model included?

    Regards,

    Johan H

    User: "Sra"
    Sra
    Altair Community Member
    OP
    Updated by Sra

    Hi Johan,

     

    Yes what you said is right. With CST I have same results and with FEKO I have different results.

    Please see the simulation results from the attached files . For reference I also attached a figure showing how the windscreen is placed. [Note: There is no connection between windscreen and chasis]

     

    Regards,

    Sravan

    <?xml version="1.0" encoding="UTF-8"?>CST.png

    <?xml version="1.0" encoding="UTF-8"?>FEKO.png

    <?xml version="1.0" encoding="UTF-8"?>Back.png

    User: "Altair Forum User"
    Altair Forum User
    Altair Employee
    Updated by Altair Forum User

    Hi @Sra

     

    Can you also include the impedance plots for the 2 different scenarios? - this might bring more insight into what is happening.

     

     

    User: "Sra"
    Sra
    Altair Community Member
    OP
    Updated by Sra

    Hi Peter,

     

    Currently I dont have any Impedance plots. I requested only currents in the simulation.

    User: "Altair Forum User"
    Altair Forum User
    Altair Employee
    Updated by Altair Forum User

    Would it be possible to attach the FEKO models?

    I must say that at around 100MHz I would expect that adding the vehicle does actually influence the antenna performance. Is there a reason why you expect that the vehicle will not change the antenna impedance?

     

    User: "Sra"
    Sra
    Altair Community Member
    OP
    Updated by Sra

    I thought that there should be no change as the antenna is not connected to the car. But now I realized that there should be a change.

     

    I made a mistake in CST [ Actually CST was not considering the car body as a PEC material and when I changed to PEC ] now the results from both tools are correct.

     

    The problem is solved.

     

    Thanks to Johan and Peter for your time.

     

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