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Nexxim Simulator >
Nexxim Component Models >
Coplanar Waveguide Elements >
Tee

Tee

Netlist Format

An instance of a coplanar waveguide tee has the following netlist syntax:

Axxx n1 n2 n3 n4 [W1=val] [W3=val][Y=val] COMPONENT=cpwtee SUBSTRATE=substrate_name

n1, n2, n3, and n4 are the names of the nodes attached to the cross.

The entry COMPONENT=cpwtee identifies the element as a coplanar waveguide tee element.

The SUBSTRATE=substrate_name is the coplanar waveguide substrate model name selected for the design (see Selecting a Coplanar Waveguide Substrate for details).

**Coplanar Waveguide Tee Instance Parameters**
Parameter	Description	Units	Default
Y	Ground-to-ground spacing at all ports. Must be greater than W1, W2, and W3.	Meter	4e-3
W1	Conductor width at port 1	Meter	1e-3
W2	Conductor width at port 2	Meter	1e-3
W3	Conductor width at port 3	Meter	1e-3

Netlist Example

A23 Port1 Port2 Port3 W1=4.0e-4 W2=3.0e-4 W3=2.0e-4 Y=6.0e-4
+ COMPONENT=CPWTEE SUBSTRATE=CPW1

where CPW1, the selected layout technology or substrate type, has a definition such as:

.SUB CPW1 CPW(
+ H=0.001524 Er=4.4 TAND=0.02 HU=2.54E-4 HL=2.54e-4
+ MET1=1.724137931034483 T1=2.54e-5 RGH=0)

Notes

1. The lines connected to nodes n1 and n2 are collinear, with conductor widths W1 and W2. The perpendicular line is connected to node n3 and has center conductor width W3. The ground-to-ground distance Y is the same for all ports.

2. For accurate results, the substrate definition should specify:
H > Y
0.1 < Wn/Y <0.9, where Wn is the conductor width at any port.

3. The coplanar mode is assumed to exist only. Parasitic effects due to air bridges are not considered by this model.

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