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Why does PO-LE appear to get less accurate as iterations increase?

A monopole antenna on the helicopter should have about 5-6 dBi of farfield gain. When using PO-LE (coupled with MoM) and limiting it to 1 iteration, it shows about 5-6 dBi of gain.
However, as the iterations increase, so does the gain, until ulimited iterations gives >23 dBi of gain!
What am I doing wrong? Does PO-LE only work for coupling and not for farfield results?
For testing purposes, I created a helicopter representative model…

Helicopter_Cosite_replace_with_non_curve_shapes.cfx

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Troy_S

These radiation patterns show the increasing error….as the iterations are set to 1, 5, 10, and unlimited…

Jaehoon

Hello Troy,

As you can see from the following picture, we need some MoM region below antenna to use hybrid PO/LE-PO solver. (The MoM region is required to exactly calculate the antenna current.)

Therefore, I added circles (radius= 1*lambda, MoM regions)) at the centers of the monopole antennas by using "Project" and attached the modified model.

Helicopter_Cosite_replace_with_non_curve_shapes_mod.cfx

(Maximum number of iterations = empty) is applied.

And the following far-field pattern is obtained.

Best regards,

Jaehoon