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CouplerDual (Dual Coupler)

Symbol

Available in ADS

Parameters

Name

Description

Units

Default

Coupling

Coupling factor

dB

10

F1

First frequency breakpoint

 

 

F2

Second frequency breakpoint

 

 

F3

Third frequency breakpoint

 

 

MVSWR1

Main arm Voltage standing wave ratio for frequency ≤ F1

None

1

MVSWR2

Main arm Voltage standing wave ratio for F1 < frequency ≤ F2

None

1

MVSWR3

Main arm voltage standing wave ratio for F2 < frequency ≤ F3

None

1

MVSWR4

Main arm voltage standing wave ratio for frequency > F3

None

1

CVSWR1

Coupled arm voltage standing wave ratio for frequency ≤ F1

None

1

CVSWR2

Coupled arm voltage standing wave ratio for F1 < frequency ≤ F2

None

1

CVSWR3

Coupled arm voltage standing wave ratio for F2 < frequency ≤ F3

None

1

CVSWR4

Coupled arm voltage standing wave ratio for frequency > F3

None

1

Loss1

Attenuation for frequency ≤ F1

dB

0

Loss2

Attenuation for F1 < frequency ≤ F2

dB

0

Loss3

Attenuation for F2 < frequency ≤ F3

dB

0

Loss4

Attenuation for frequency > F3

dB

0

Direct1

Directivity for frequency ≤ F1

dB

100

Direct2

Directivity for F1 < frequency ≤ F2

dB

100

Direct3

Directivity for F2 < frequency ≤ F3

dB

100

Direct4

Directivity for frequency > F3

dB

100

ZRef

Reference impedance for all ports

Ohm

50

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. Port 1 is the input port; port 2 is the through port; port 3 is the coupled port; port 4 is the isolated port. Note that the placement of these pins in ADS differs from many standard textbooks.
  2. Both ports of the main arm (ports 1 and 2) are assumed to have the same VSWR. Both ports of the coupled arm (ports 3 and 4) are also assumed to have the same VSWR.
  3. Coupling is assumed to be constant across all frequency bands.
  4. Loss is the dissipation of the coupler; it affects S21 and S12 only. These S-parameters are calculated as if the coupler was dissipationless and are then scaled by
  5. Internally, coupler isolation is calculated as Coupling + Direct in dB.
  6. Up to three frequency breakpoints can be used to define four bands, with different directivity losses and VSWR values for each frequency band. If no frequencies are specified, then this model is frequency independent and uses Direct1, Loss1, and VSWR1 only.
  7. There is a 90-degree phase shift between the input and the coupled ports.
  8. In the coupled arm, the two ports are uncoupled.
  9. This is an ideal component with potentially non-causal behavior. It is not recommended for transient simulation.
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