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  1. #61
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    Re: HFSS port 'Port1' does not have a valid reference plane above or below it.

    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.




  2. #62
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    Re: HFSS port 'Port1' does not have a valid reference plane above or below it.

    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

    Code:
    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



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  3. #63
    Advanced Member level 2
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    Re: HFSS port 'Port1' does not have a valid reference plane above or below it.

    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 ??






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