HFSS port 'Port1' does not have a valid reference plane above or below it.

[promach]

I managed to make the balun more matched in terms of phase difference for S12 and S13

Note: I have attached a zip containing the dxf file as well as the Ansys Neural File.

 

[promach]

I have imported and simulated the same layout in Sonnet

How do I unwrap the phase difference (S12-S13) such that it does not jump from +180 degree to -180 degree ?

planar_marchand_balun.son

FTYP SONPROJ 13 ! Sonnet Project File
VER 15.52
DIM
FREQ GHZ
IND NH
LNG MM
ANG DEG
CON /OH
CAP PF
RES OH
END DIM
FREQ
ABS 1.0e-6 6.0 
END FREQ
CONTROL
ABS
OPTIONS  -bd 
SPEED 0
CACHE_ABS 1
TARG_ABS 300
Q_ACC N
END CONTROL
GEO
VGMODE STOP
TMET "Lossless" 0 SUP 0 0 0 0
BMET "Lossless" 0 SUP 0 0 0 0
MET "Unknown_metal" 1 NOR INF 0 0 
BOX 1 48.2 55.2 482 552 20 0
      20 1 1 0 0 0 0 "Air"
      2 4.4 1 0.02 0 0 0 "FR-4"
LORGN 0 55.2 U 
POR1 STD
POLY 55 1
3
1 50 0 0 0 0.0793 26.83607384 
POR1 STD
POLY 56 1
8
3 50 0 0 0 40.71817024 55.2107 
POR1 STD
POLY 58 1
0
2 50 0 0 0 40.75819786 0.02141472 
NUM 6
VIA POLYGON
0 11 -1 N 40 1 1 100 100 0 0 0 Y
TOLEVEL GND SOLID COVERS
23.69999906 24.7624597
23.50901605 25.02532525
23.19999906 25.12573096
22.89098206 25.02532525
22.69999906 24.7624597
22.69999906 24.43754
22.89098206 24.17467444
23.19999906 24.07426874
23.50901605 24.17467444
23.69999906 24.43754
23.69999906 24.7624597
END
VIA POLYGON
0 11 -1 N 41 1 1 100 100 0 0 0 Y
TOLEVEL GND SOLID COVERS
28.89999906 41.7624597
28.70901605 42.02532525
28.39999906 42.12573096
28.09098206 42.02532525
27.89999906 41.7624597
27.89999906 41.43754
28.09098206 41.17467444
28.39999906 41.07426874
28.70901605 41.17467444
28.89999906 41.43754
28.89999906 41.7624597
END
0 11 -1 N 55 1 1 100 100 0 0 0 Y
41.57590492 26.75368115
41.19581611 25.83607384
14.0793 25.83607384
0.0793 25.83607384
0.0793 27.83607384
14.0793 27.83607384
37.66508491 27.83607384
25.37219246 40.12896665
26.78640754 41.54318025
41.57590492 26.75368115
41.57590492 26.75368115
END
0 11 -1 N 56 1 1 100 100 0 0 0 Y
41.71817024 55.2107
41.71817024 39.78252312
41.71817024 28.09226319
40.80056007 27.7121782
26.87712104 41.63561791
28.28568275 43.05548366
39.71817024 31.62299725
39.71817024 39.78252312
39.71817024 55.2107
41.71817024 55.2107
41.71817024 55.2107
END
0 6 -1 N 57 1 1 100 100 0 0 0 Y
41.75852211 23.68997475
22.07243354 23.68997475
22.07243354 25.68997475
41.75852211 25.68997475
41.75852211 23.68997475
41.75852211 23.68997475
END
0 6 -1 N 58 1 1 100 100 0 0 0 Y
41.75852211 0.02141472
39.75787361 0.02141472
39.75787361 23.68997475
41.75852211 23.68997475
41.75852211 0.02141472
41.75852211 0.02141472
END
END GEO
OPT
MAX 100
VARS
END
END OPT
VARSWP
END VARSWP

 

[promach]

See https://github.com/promach/planar_marchand_balun

I suppose I made mistake in the width of the coupled microstrip (W=2mm) in terms of ports impedance of 50 ohm ??