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Nexxim Simulator >
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Nexxim Ideal Microwave >
   Directional Coupler, 3-Port       

Directional Coupler, 3-Port

 

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Netlist Form

An instance of a three-port directional coupler has the following Nexxim netlist syntax:

Axxx n1 n2 n3 [COUP=val] [LOSS=val] [DIRECTIVITY=val]
[VSWR1=val] [VSWR2=val] [VSWR3=val] [ZREF=val] COMPONENT=coupler3

n1, n2, and n3 are the nodes connected to the coupler. The entry COMPONENT=coupler3 identifies the element as a 3-port directional coupler.

 


Three-Port Directional Coupler Instance Parameters

Parameter

Description

Units

Default

COUP

Coupling factor

dB

20

LOSS

Main arm insertion loss

dB

3

DIRECTIVITY

Directivity

dB

100

VSWR1

Voltage standing wave ratio at port 1

dB

1

VSWR2

Voltage standing wave ratio at port 2

dB

1

VSWR3

Voltage standing wave ratio at port 3

dB

1

ZREF (R0)

Reference Impedance

Ohm

50

Netlist Example

Acoup3 11 21 13 COUPL=30 COMPONENT=coupler

Notes

1. 20 log |S21| = 20 log |S12| = -LOSS

2. 20 log |S23| = 20 log |S32| = DIRECTIVITY

3. 20 log |S31| = 20 log |S13| = -COUP

4. |S11| = (VSWR1 -1)/(VSWR1 + 1), where VSWR1 is the voltage standing wave ratio at port 1.

5. |S22| = (VSWR2 -1)/(VSWR2 + 1), where VSWR2 is the voltage standing wave ratio at port 2.

6. |S33| = (VSWR3 -1)/(VSWR3 + 1), where VSWR3 is the voltage standing wave ratio at port 2.

7. The phase of all S-parameters is zero degrees.



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