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Twin Wire Cable, Ideal Model, Electrical Length (TWCE)

Twin Wire Cable, Ideal Model, Electrical Length (TWCE)

Properties	Description	Units	Default	Range
Z0	Coupler impedance: where Z_eis the even mode impedance, and Z_o is the 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 and E	Hz	Required	³ 0
E	Electrical length	deg	Required	> 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
BHC1, BJC1	50	2.65	2.53	1.92
BHC2, BJC2	50	2.65	2.53	1.92
FA1, KA1, KC1, LC1	50	3.00	2.5	1.20
FA2, KA2, KC2, LC2	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

TWCEMPE:NAME n1 n2 n3 n4 Z0=val K=val E=val [A=val] [F=val]

Netlist Example

TWCE:TWCE1 1 2 3 4 Z0=50 E=90 A=1.92/M F=470MHZ K=10

References

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