Circulator (Ideal 3-Port Circulator)

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Name	Description	Units	Default
F1	First frequency breakpoint
F2	Second frequency breakpoint
F3	Third frequency breakpoint
Loss1	Attenuation for frequencies ≤ F1	dB	0
Loss2	Attenuation for F1< frequency ≤ F2	dB	0
Loss3	Attenuation for F2 > frequency ≤ F3	dB	0
Loss4	Attenuation for frequencies > F3	dB	0
VSWR1	Voltage standing wave ratio at both ports for frequencies ≤ F1	None	1
VSWR2	Voltage standing wave ratio at both ports for frequencies > F1, ≤ F2	None	1
VSWR3	Voltage standing wave ratio at both ports for frequencies > F2, ≤ F3	None	1
VSWR4	Voltage standing wave ratio at both ports for frequencies > F3	None	1
Isolat	Isolation	dB	100
Z1	Reference impedance for port 1
Z2	Reference impedance for port 2
Z3	Reference impedance for port 3
Temp	Temperature	°C	None
CheckPassivity	Check passivity flag: if set to yes, a passivity check is performed and a warning is output if the device is not passive; if set to no, a passivity check is not performed.	None	yes

Up to three frequency breakpoints can be used to define four bands. Each band will have a different Loss# and VSWR#. If no frequencies are specified, then this model is frequency independent and only uses Loss1 and VSWR1.
A loss is modeled regardless of the sign of the Loss parameter value.
All ports have the same VSWR.
Isolation is constant across all frequency bands.
The 3 × 3 S-matrix for Circulator is described by