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Transmission Lines

IP.com Disclosure Number: IPCOM000095211D
Original Publication Date: 1965-Oct-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 34K

Publishing Venue

IBM

Related People

Young, JER: AUTHOR

Abstract

The multiwire transmission line comprises two balanced conductors and a shielding conductor. If the shielding conductor is made lossy by the inclusion of distributed resistance, common mode signals in the balanced conductors are attenuated without affecting difference mode signals in it.

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Transmission Lines

The multiwire transmission line comprises two balanced conductors and a shielding conductor. If the shielding conductor is made lossy by the inclusion of distributed resistance, common mode signals in the balanced conductors are attenuated without affecting difference mode signals in it.

In drawing 1, a pair of balanced lines 1 and 2 is sheathed by helix 3 of resistive strip material. In drawing 2, a pair of strip conductors 4 and 5 is sheathed by helix 6 of conductive material with a rectangular cross-section. Two strips of resistive material 7 and 8 are placed on helix 6 between its inner wall and conductors 4 and 5. In drawing 3, a stripline pair passes over a grooved conductive ground plane 9. The grooves are each partially filled with resistive material 10.

The principle can be applied to lines having more than one pair of conductors to reduce cross talk between the pairs of conductors.

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