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Netlist Format

A branch line coupler length instance has the following netlist format:

AMSCOUPBxxx n1 n2 n3 n4 W1=val W2=val W3=val W4=val W5=val L1=val L2=val L3=val COMPONENT=branch_coupler SUBSTRATE=substrate_name

n1, n2, n3, and n4 are the names of the nodes attached to the coupler. The entry COMPONENT=branch_coupler identifies the element.

The entry SUBSTRATE=substrate_name identifies the microstrip substrate model name selected for the design (see Selecting a Microstrip Substrate). See the Microstrip (MS) Substrate for information on this substrate type.

**Branch Line Coupler Instance Parameters**
Parameter	Description	Unit	Default
W1	Width of lines connected to nodes n1 and n4	Meter	0.5e-3
W2	Width of lines connected to nodes n2 and n3	Meter	0.5e-3
W3	Width of line from n1 to n4	Meter	0.5e-3
W4	Width of line from n1 to n2 Width of line from n3 to n4	Meter	0.5e-3
W5	Width of line from n2 to n3	Meter	0.5e-3
L1	Length along center line of W4	Meter	2e-3
L2	Half length along center line of W3	Meter	2e-3
L3	Half length along center line of W5	Meter	0

Netlist Example

AMSCOUPB1 net1 Port2 net3 Port4 W1=1e-3 W2=.2e-3 W3=.7e-3
+ W4=.4e-3 L1=1.8e-3 L2=1.5e-3 L3=1.5e-3
+ COMPONENT=branch_coupler SUBSTRATE=FR4

where FR4, the selected layout technology or substrate type, has a definition such as:

.SUB FR4 MS( H=7.6200e-004 Er=4.4 TAND=0.02 TANM=0
+ MSat=0 MRem=0 HU=0.00508 MET1=1.72413793103448
+ T1=1.7145e-005 RGH=0mil)


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Branch Line Coupler

Netlist Format

Netlist Example