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   Twin Wire Cable, Ideal Model, Physical Length (TWCP)       

Twin Wire Cable, Ideal Model, Physical Length (TWCP)

 

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Properties

Description

Units

Default

Range

Z0

Coupler impedance:

 

where: Ze: even mode impedance, and Zo: odd mode impedance

Ohms

Required

> 0

K

Coupling coefficient

dB

Required

> 0

A

Average attenuation at F in dB/m

none

0.0

³ 0

F

Reference frequency for A

Hz

1GHz

³ 0

P

Physical length

m

Required

> 0

ER

Relative dielectric constant of the homogeneously filled dielectric cable

none

1

> 0

 

Notes

1. The table provided below was derived from Wireline and Wirepac Design Guide, Sage Labo­ratories, 11 Huron Dr., Natick, MA. Accuracy is limited by the information available. Infor­mation is also available in this guide for physical dimensions for use in the TWCP model (Physical model for Twin Wire Cable.)

 


Type

Z0(Ohms)

K(dB)

ER

A(dB/m)

B7HC*1

75

3.00

2.53

1.92

B75HC*3

75

2.8

2.53

1.92

BMCB3

50

2.8

2.53

1.92

BHC*1, BJC*1

50

2.65

2.53

1.92

BHC*2, BJC*2

50

2.65

2.53

1.92

FA*1, KA*1, KC*1, LC*1

50

3.00

2.5

1.20

FA*2, KA*2, KC*2, LC*2

50

2.70

2.50

1.20

GCB6

50

10.25

2.37

0.56

2. The design lengths (Coupling length=0.25l) are presented on page two of the Sage design guide:

 


Type HC, JC, MC, 75HC:

L=1850in/F(MHz)=46.99m/F(MHz)ÞER=2.53

Type KA, KC, LC, FA:

L=1970in/F(MHz)=50.04m/F(MHz)ÞER=2.50

Type GC:

L=2100in/F(MHz)=53.34m/F(MHz)ÞER=2.37

 

Netlist Form

TWCP:NAME n1 n2 n3 n4 Z0=val K=val ER=val P=val+ [A=val] [F=val]

Netlist Example

TWCP:TWCP1 1 2 3 4 Z0=50 P=100M ER=2.53 A=1.92 F=470MHZ K=10

References

1. Wireline and Wirepac Design Guide, Sage Laboratories, 11 Huron Dr., Natick, MA



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