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System Simulator >
System Component Models >
Stripline >
SL Offset Coupled Lines, Physical Length (SLOCL)

SL Offset Coupled Lines, Physical Length (SLOCL)

Properties	Description	Units	Default	Range
W	Conductor width	m	Required	> 0
S	Vertical spacing between the conductors	m	Required	0 < S+2T < B
WC	Horizontal offset between conductors	m	Required	(-¥,¥)
P	Physical length	m	Required	(-¥,¥)
AE	Even mode attenuation	dB/m	0.0	³ 0
AO	Odd mode attenuation	dB/m	0.0	³ 0
F	Reference frequency for AE and AO	Hz	0.0	> 0
sub	Substrate name	none	Required	string

Notes

1. The following conditions should be satisfied: -2.5 < WC/B £ W/B, and W/(B-S) ³ 0.35, where B is the ground plane spacing defined in the .SUB statement.

2. The results may not converge for all values of WC/B.

3. If WC/W is larger than or equal to 0.9, the conductor loss attenuation factors (AE and AO) are estimated by the program, unless the user specifies them in the input.

4. If WC/W is less than 0.9, the user has to define AE and AO if their effect is to be taken into consideration. They are not calculated by the program.

5. If the user specifies AE and AO, then the reference frequency F has to be defined too. If F is not defined, then AE and AO will be reset to zero.

6. Metallization thickness is taken into account in the analysis.

Netlist Form

SLOCL:NAME n1 n2 n3 n4 W=val S=val WC=val P=val
+ [AE=val] [AO=val] [F=val] SUB=label

Netlist Example

SLOCL:OCL1 1 2 3 4 W=50MIL S=40MIL WC=10MIL AE=0.2 AO=0.2
+ P=0.05CM F=1GHz SUB=SUB1

where SUB1 needs to be defined in the corresponding .SUB statement.

References

1. J. P. Shelton, “Impedances of Offset Parallel Coupled Strip Transmission Line,” IEEE Trans. on MTT, Jan. 1966, pp. 7-15, and correction in MTT, May 1966, p. 249.

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