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Problem with ADS em simulation for dualband filter

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allison41

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Hi guys, im trying to simulate a dual-band microstrip filter in ADS with the frequency at 2.4Ghz to 5Ghz.
I've already have all my components designed using tlines-microstrip and its under (jpeg1) and the graph obtained is under (jpeg2).
The problem occurs when i convert my filter into layout design(jpeg3) in ads.
The graph obtain through em simulation seems to be very weird and seems to be 1GHz shifted.(jpeg4)

For em simulation:
substrate fr4=4.7 dieelctric constant
height=1.6mm
frequency plan=1.4GHz to 7GHz, Npts=50

Ive tried changing the frequency plans , Npts and the frequency type to adaptive but nothing changes

Could you guys help me figure out the problem? Thank you :)

jpeg1
jpeg1.jpg

jpeg2
jpeg2.png

jpeg3
jpeg3.png

jpeg4
jpeg4.png
 

I doubt that the TL crosspoint model can be applied to the extreme stub widths in the actual implementation. The assumption of a 1-D wave transmission isn't met. The edges of the shunt stubs seem even to touch the series stubs.
 

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