ECE 6130 -- Power Dividers and Couplers Text Section 7-1 How do you design a T-junction power divider? What is a circulator, and how does it work (with respect to the input / output fields)? Power Dividers / Couplers: 3-Port (T-Junction) General : 3-Port S-parameters Issues: 1) Matched Ports (Sii = 0) 2) Reciprocal (symmetric S) 3) Lossless (unitary S) S13* S23 = 0 So two of (S12, S23, S13) S23* S12 = 0 S12* S13 = 0 |S12|2 + |S13|2 = 1 But then these can't be satisified. |S12|2 + |S23|2 = 1 |S13|2 + |S23|2 = 1 So, the choice is you can have 2 of three, and this defines the type of power divider / coupler you get. []SSSSSSSSSS=⎡⎣⎢⎢⎢⎤⎦⎥⎥⎥11 12 1321 22 2331 32 33[]SSSSSSS=⎡⎣⎢⎢⎢⎤⎦⎥⎥⎥00012 1321 2331 32[]SSSSSSS=⎡⎣⎢⎢⎢⎤⎦⎥⎥⎥00012 1312 2313 23CIRCULATOR (Matched and Lossless, But not reciprocal) []
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