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    Selection of Zeros of S11(s)

    We can determine S11(s) from S21(s).

    S11(s)*S11(-s) = 1 - S21(s)*S21(-s)
    Zin(s) = {1 + S11(s)} / {1 - S11(s)} or
    Zin(s) = {1 - S11(s)} / {1 + S11(s)}

    Here two options exist for S11(s).
    (1) Choose Zeros <= 0.0
    (2) Choose Zeros >= 0.0

    Usually I choose (1), since (1) is Minimum Phase System.
    However both are surely feasible.

    Actually, if I realize Zin(s) by T-Toplogy LC Ladder circuit, (1) and (2) are simply reverse each other.

    Code:
    # Zeros <= 0.0
    L1 = 2.25822
    C2 = 1.11103
    L3 = 0.804011
    C4 = 0.507241
    L5 = 0.174319
    R5 = 1
    
    # Zeros >= 0.0
    L1 = 0.174319
    C2 = 0.507241
    L3 = 0.804011
    C4 = 1.11103
    L5 = 2.25822
    R5 = 1
    How can I interpret selection of zeros of S11 ?
    Last edited by pancho_hideboo; 20th June 2019 at 14:19.

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