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How to detect surface-wave loss in microstrip antennas using HFSS?

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It was observed that HFSS tends to overestimate the radiation efficiency of microstrip patch antennas. I strongly doubt that this overestimation is because that HFSS regards surface-wave power as radiation instead of loss. Is there any method to isolate the surface-wave power from the space-wave power in HFSS? Any comment is appreciated.
 

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