Selection of Zeros of S11(s)
时间：04-04
整理：3721RD
点击：
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.
How can I interpret selection of zeros of S11 ?
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