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SPICE netlist

* GNSS Antenna Eval Board - Bias-Tee / RF-DC Diplexer
* J1 = RF (SMA), J2 = RF+DC combined (SMA), J3 = DC (BNC)
* Node map: rf_in -> [C1||C2] -> mid(=J2) -> [R1||L1] -> n1
*           -> [R2||L2] -> n2 -> [R3||L3] -> n3 -> [R4||L4] -> dc_out(=J3)
* Each rung node (n1,n2,n3) has an R+C series snubber to ground.

* ---- Port 1: RF (J1), 50 ohm source ----
Vrf rf_in 0 AC 1 DC 0
Rs1 rf_in rf_in_s 50

* ---- DC block: C1 || C2 ----
C1 rf_in_s mid 27n
C2 rf_in_s mid 27n

* ---- Port 2: RF+DC combined (J2), termination on node "mid" ----
Rload2 mid 0 50

* ---- Stage 1 ----
R1 mid n1 1.5k
L1 mid n1 330n
R5 n1 s1 1.5k
C3 s1 0 1p

* ---- Stage 2 ----
R2 n1 n2 1.5k
L2 n1 n2 910n
R6 n2 s2 1.5k
C4 s2 0 10p

* ---- Stage 3 ----
R3 n2 n3 1.5k
L3 n2 n3 18u
R7 n3 s3 1.5k
C5 s3 0 10n

* ---- Stage 4 / Port 3: DC (J3) ----
R4 n3 dc_out 5.11k
L4 n3 dc_out 470u
Rload3 dc_out 0 50

* ---- AC sweep: 1 kHz to 6 GHz ----
.ac dec 50 1k 6G

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