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Circulator (Ideal 3-Port Circulator)

Symbol

Available in ADS

Parameters

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

Notes/Equations
  1. 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.
  2. A loss is modeled regardless of the sign of the Loss parameter value.
  3. All ports have the same VSWR.
  4. Isolation is constant across all frequency bands.
  5. The 3 × 3 S-matrix for Circulator is described by


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