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Variable Delay Transmission Line

IP.com Disclosure Number: IPCOM000095275D
Original Publication Date: 1965-Nov-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 24K

Publishing Venue

IBM

Related People

Abbas, SA: AUTHOR

Abstract

Loading a transmission line with magnetic storage elements permits operation with delays which vary as a function of the settings of the elements. The high speed of the memory elements permits the delay line to act as a pulse magnifier.

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Variable Delay Transmission Line

Loading a transmission line with magnetic storage elements permits operation with delays which vary as a function of the settings of the elements. The high speed of the memory elements permits the delay line to act as a pulse magnifier.

The variable delay line is made up of a conductive strip with enlargements enclosing apertures to resemble chain links, coated with a thin magnetic layer. The magnetic layer about the aperture on each link is arranged to have uniaxial anisotropy and to exhibit a rotational switching characteristic. The easy axis of each link is around the aperture and the hard axis is at right angles to it. Current passed through the conductive strip tends to magnetize the magnetic layer in the hard axis direction. When the material is saturated in the hard axis direction it exhibits minimum inductance with respect to the input.

A DC bias is provided to establish an initial magnetic condition in each element in which the magnetism is partially rotated toward the hard axis. The input pulse completes the rotation of the storage elements to the hard direction. The inductance of orthogonal mode magnetic film storage elements varies during the switching of the films from an orientation along the easy axis to an orientation along the hard axis. Once orientation reaches the hard axis, the inductance drops in magnitude to a value approaching the inductance of air. The variable delay results from the variation in inductance...