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To solve it:
Lump port use for internal port:
-you can change the port to lumped port if you need to make internal port like your model. you can see a link below
https://hfss13.blogspot.com/2012/05/lumped-ports.html
or
-Wave port use for external port;
you need to revise the air model by make...
Additional, Perfect E use for the boundary which is orthogonal electric field , such as ground plane, metallic object. For HFSS, if you do not assign boundary on the outer surface, the software will automatic assign Perfect E.
for wilkinson power divider model, it is base on microstrip model...
Hi Natnoraa
you can check the boundaty by HFSS>> Boundary display (solver view)>> check Rad1, you will find the boundary of bottom side of substrate. it is radiation boundary. if you change to Perfect E you will get S21 -4dB, S11 -19dB and S22 -15dB at 5.5 GHz.
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