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Stripline >
   SL Coupled Lines, Broadside, Inhomogeneous, Physical Length (SLIBCL)       

SL Coupled Lines, Broadside, Inhomogeneous, Physical Length (SLIBCL)

 

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Cross section of an inhomogeneous broadside coupled stripline

 


Properties

Description

Units

Default

Range

W

Conductor width

m

Required

> 0

S

Conductor spacing

m

Required

0 < S+2T < B

P

Physical length of conductors

m

Required

(-¥,¥)

sub

Substrate name

none

Required

string

 

Notes

1. This component uses a stripline substrate but is symmetric, suspended stripline.

2. The separation between ground planes (B) is taken from the stripline substrate definition.

3. Loss calculations are based on metallization and dielectric loss tangent information specified for the substrate.

4. The dielectric constant specified in the substrate is used as the dielectric constant er of the material filling the space between the two strips.

5. The expressions used for the evaluation of the characteristic impedances and effective dielec­tric constants are accurate for:

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and


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6. A quasi-TEM mode propagation is assumed, which should be valid as long as B/l and W/l are much smaller than unity, where l is the guide wavelength.

Netlist Form

SLIBCL:NAME n1 n2 n3 n4 W=val S=val P=val SUB=label

Netlist Example

SLIBCL:BCL1 1 2 3 4 W=50MIL S=40MIL P=1.5IN SUB=SUB1

where SUB1 needs to be defined through the .SUB statement.

References

1. Bhartia & Pramanick, “Computer-Aided Design Models for Broadside-Coupled Striplines and Millimeter-Wave Suspended Substrate Microstrip Lines,” IEEE MTT, pp. 1476-1658, Nov. 1988.

2. Bhal & Bhartia, “Characteristics of Inhomogeneous Broadside-Coupled Striplines,” IEEE MTT, pp. 529-535, June 1980.



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