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Magnetically Controllable Delay Line

IP.com Disclosure Number: IPCOM000093966D
Original Publication Date: 1966-Apr-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 61K

Publishing Venue

IBM

Related People

Thomas, H: AUTHOR

Abstract

The behavior of a waveguide loaded with magnetic material, e.g., a thin film, exhibiting uniaxial anisotropy can be controlled by applying external magnetic fields. Depending upon the configuration of the line, the orientation of the easy axis, the direction and strength of the external field, several effects can be achieved. Switching between negligible delay time and a fixed value can be effected. Continuous variation of delay time is achieved. There can be controlled phase shifts.

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Magnetically Controllable Delay Line

The behavior of a waveguide loaded with magnetic material, e.g., a thin film, exhibiting uniaxial anisotropy can be controlled by applying external magnetic fields. Depending upon the configuration of the line, the orientation of the easy axis, the direction and strength of the external field, several effects can be achieved. Switching between negligible delay time and a fixed value can be effected. Continuous variation of delay time is achieved. There can be controlled phase shifts.

For example, a stripline of length L filled with a dielectric (epsilon 2, mu2 = 1) is loaded with a NiFe film (epsilon 1, mu 1) having an easy axis. The film, shaded area, fills fraction p between the outer strip con conductors. When v designates the phase velocity, the

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By suitably applied fields H, the permeability mu 1 can be varied between 1 and 10/5/, which for p = 0. 1 results in possible delay time variations by a factor of 100.

Three configurations are considered in more detail. The line propagation direction is designated z, the anisotropy field of the film is H(K), the external field is H.

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The delay time is approximately constant for frequencies up to half the value of the ferromagnetic resonance frequency. Phase shifts of the order of 2 pi for the maximum frequency are possible with striplines having a length of a few cm.

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