Help with Error 47596: Input angle of incidence is our of interpolation range for characterised surface

Luke_21978
Luke_21978 Altair Community Member
edited May 7 in Community Q&A

Hello,

I have two sheets that are declared with RL-GO solver and a characterised surface media.  I have an equivalent far field source in the model and it runs well with just the two sheets.  However, when I incorporate an electrically large PEC object near the radiator and these two sheets I get Error 47596.   Any suggestions on how to avoid these angle of incidence errors?  Should I just simulate more angles in the periodic structure simulation that generates the .tr file? 

I would upload the characterised surface file, but the .tr file format is not supported on this website for some reason.  

Thanks for your help and suggestions,

Luke

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Answers

  • Jaehoon
    Jaehoon
    Altair Employee
    edited May 6

    Hello Luke,

    The error 47596 is related to the relation between the plane wave's incident angles (used to generate a .tr file) and the U vector of the characterized surface medium (using the .tr file).

    I think there are two ways to resolve this error. Please try one of two.

    1) Please try to change the U vector. (for example, from x=0 & 1  to x=0 & -1)

    image

    2) Please add more incident angles of the plane wave (for example, from 0<theta<90, 0<phi<360  to 0<theta<180, 0<phi<360 ) when generating the .tr file. <- Then, you don't have to care about the U vector.

     

    Feko will automatically apply an interpolation when the incident angles in the .tr file are too sparse.

     

    Thank you.

    Jaehoon

     

  • Luke_21978
    Luke_21978 Altair Community Member
    edited May 7
    Jaehoon Kim_22316 said:

    Hello Luke,

    The error 47596 is related to the relation between the plane wave's incident angles (used to generate a .tr file) and the U vector of the characterized surface medium (using the .tr file).

    I think there are two ways to resolve this error. Please try one of two.

    1) Please try to change the U vector. (for example, from x=0 & 1  to x=0 & -1)

    image

    2) Please add more incident angles of the plane wave (for example, from 0<theta<90, 0<phi<360  to 0<theta<180, 0<phi<360 ) when generating the .tr file. <- Then, you don't have to care about the U vector.

     

    Feko will automatically apply an interpolation when the incident angles in the .tr file are too sparse.

     

    Thank you.

    Jaehoon

     

    Thanks Jaehoon, 

    I wasn't able to execute the first suggestion.  It is already working with the present coordinate system in the starting simulation.  It's when a new PEC object is added to the scene is when the angle of incidence error comes in. 

    I think the second suggestion will do the trick.  Is there's a step size requirement for the .tr files to where interpolation is guaranteed?  Do I need to 1 degree step increments for theta: 0-180 and phi: 0-360? 

    Thanks,

    Luke

  • Jaehoon
    Jaehoon
    Altair Employee
    edited May 7
    Luke_21978 said:

    Thanks Jaehoon, 

    I wasn't able to execute the first suggestion.  It is already working with the present coordinate system in the starting simulation.  It's when a new PEC object is added to the scene is when the angle of incidence error comes in. 

    I think the second suggestion will do the trick.  Is there's a step size requirement for the .tr files to where interpolation is guaranteed?  Do I need to 1 degree step increments for theta: 0-180 and phi: 0-360? 

    Thanks,

    Luke

    Hello Luke,

    Even if the step size is too big, Feko will interpolate without any error.

    I think it 's a matter of the accuracy. If the T/R variation is big at certain incident angles, finer step should be required even for those angles. 

    Sometimes, 0.1 degree can be required as the step.

    Regards,

    Jaehoon

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