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Tee, Reference Planes at Center

Tee, Reference Planes at Center

Netlist Format

A tee instance has the following netlist format:

Axxx n1 n2 n3 W1=val W2=val W3=val [NSUM=val]
COMPONENT=tee SUBSTRATE=substrate_name

n1, n2, and n3 are the names of the nodes attached to the tee. The entry COMPONENT=tee identifies the element as a tee. 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.

**Tee Instance Parameters**
Parameter	Description	Unit	Default
W1	Width of line connected to node n1	Meter	1e-3
W2	Width of line connected to node n2	Meter	1e-3
W3	Width of line connected to node n3	Meter	1e-3
NSUM	Number of modes considered in the field expansion	None	3

Netlist Example

A23 Port1 Port2 Port3 W1=1e-3 W2=2e-3 W3=3e-3
+ COMPONENT=TEE 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)

Notes

1. [All substrates] The collinear lines are connected to nodes n1 and n2 and have widths W1 and W2; the perpendicular line is connected to node n3 and has width W3.

2. [All substrates] The n1, n2 reference plane is centered on the width of the line connected to node n3 (width W3).

3. [All substrates] If W1 > W2: Node n3 is collinear with W1.

4. [All substrates] If W2 > W1: Node n3 is collinear with W2.

5. [Microstrip] Radiation loss is calculated if HU is not specified in the .SUB statement.

6. [Microstrip] To get accurate results, the following condition should be satisfied: H/l_g<< 1, where l_g is the guide wavelength in the substrate dielectric.

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