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Non-Linear Controllable Transmission Lines

IP.com Disclosure Number: IPCOM000098221D
Original Publication Date: 1960-Apr-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 65K

Publishing Venue

IBM

Related People

Kinberg, COL: AUTHOR [+3]

Abstract

A coaxial non-linear transmission line (upper figure) consists of an inner conducting tube 11 with a thin ferromagnetic coating 12 on its outer surface and an outer conducting tube 13 with a thin ferromagnetic coating 14 on its inner surface. The two tubes are separated by an insulating cylinder 15. Each ferromagnetic coating is preferably made of an easily saturable material. An A. C. current supplied to the input terminals tends to flow on the outer surface of the inner tube and on the inner surface of the outer tube (skin effect). At a sufficiently high frequency the major part of the current flows through the ferromagnetic coatings 12 and 14 which exhibit high ohmic losses in comparison with the low ohmic conducting parts of the tubes 11 and 13.

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Non-Linear Controllable Transmission Lines

A coaxial non-linear transmission line (upper figure) consists of an inner conducting tube 11 with a thin ferromagnetic coating 12 on its outer surface and an outer conducting tube 13 with a thin ferromagnetic coating 14 on its inner surface. The two tubes are separated by an insulating cylinder 15. Each ferromagnetic coating is preferably made of an easily saturable material. An A.
C. current supplied to the input terminals tends to flow on the outer surface of the inner tube and on the inner surface of the outer tube (skin effect). At a sufficiently high frequency the major part of the current flows through the ferromagnetic coatings 12 and 14 which exhibit high ohmic losses in comparison with the low ohmic conducting parts of the tubes 11 and 13. Due to this current distribution the longitudinal impedance of the transmission line increases with frequency.

By means of a control current through the control winding,the ferromagnetic coatings can be saturated so that the skin depth of penetration increases and an important portion of the A. C. current is caused to flow through the non- magnetic, low ohmic conducting parts of the tubes 11 and 13. This gives rise to a reduction of the longitudinal impedance of the transmission line.

In this way a variation of all transmission line characteristics, such as propagation constant, characteristic impedance, and limiting frequency are realized.

The planar non-linear transmission...