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Nexxim Simulator >
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Coupled Lines, Full-Wave Model

Coupled Lines, Full-Wave Model

Netlist Form

A two-conductor multicoupled line, full-wave instance has the following netlist syntax:

Axxx in1 in2 out1 out2 NL=2 W1=val S1=val W2=val P=val
[S0=val] [SN=val]
[NBAS=val] [NSUM=val][CERR=val] [STEP=val] [FO=val]
COMPONENT=slotmcpl SUBSTRATE=substrate_name

in1 and in2 are the names of the input nodes. out1 and out2 are the corresponding output nodes. The entry COMPONENT=slotmcpl is required.

The SUBSTRATE=substrate_name is the slotline substrate model name selected for the design (see Selecting a Slotline Substrate for details.

**Slotline Coupled Lines, Full-Wave Model, Instance Parameters**
Parameter	Description	Units	Default
NL	Number of signal lines	None	Must be 2
P	Physical length	Meter	1e-3
S1	Spacing between slot 1 and 2	Meter	1e-3
W1, W2	Slot widths	Meter	1e-3
S0	Spacing from left enclosure to the first slot	Meter	0
SN	Spacing from right enclosure wall to the second slot	Meter	0
NBAS	Number of basis functions to use in the expansions	None	3
NSUM	Number of summations to use in the expansions	None	700
CERR	Calculation tolerance error (minimum value 1.0e-14)	None	1e-7
STEP	Root-searching algorithm step size	None	0.01
FO	Semi-dynamic mode calculation frequency (See Notes)	Hertz	-1 (Full-wave mode

Netlist Example

A3 Port1 Port3 Port2 Port4 NL=2
+ W1=1.25e-3 S1=1.5e-3 W2=1.25e-3 P=3e-3
+ COMPONENT=slotmcpl SUBstrate=SLOT1

where SLOT1, the selected layout technology or substrate type, has a definition such as:

.SUB SLOT1 SLOT(
+ B=0.001524 Er=4.4 TAND=0.02 H=0.5e-3 HU=2.54e-003
+ MET1=1.724137931034483 T1=2.5400e-005
+ RGH=0)

Notes

1. This model uses a proprietary full-wave spectral domain algorithm. The parameters NBAS, NSUM, CERR, and STEP control the model solver. If there is difficulty finding roots, try changing the values of parameters as follows:

• Gradually increase NSUM (maximum of 1500) until roots can be found.

• Gradually decrease CERR (minimum 1e-14).

• When S0 and S2 wall spacings are comparable to S1, reduce NSUM to 500 or less.

2. The parameter FO is required for semi-dynamic mode computation only. In this mode, the effective dielectric constants and characteristic impedances are computed only once at the FO frequency. This data is then used to compute the model for all other frequencies. The semi-dynamic mode offers a fast solution with a close approximation to the full-wave solution. Typically FO is specified at the center of the frequency range of interest with values exceeding 1GHz minimum. If this value is not specified, it is automatically computed at the center frequency of the frequency range specified by the user.

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