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

Luke_21978

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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Feko

v2023.1

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Jaehoon

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)

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

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)

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

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