Letter | Published:

Unusual Waveguide Characteristics associated with the Apparent Negative Permeability obtainable in Ferrites

Naturevolume 175pages11351136 (1955) | Download Citation



B AND H in a magnetized ferrite material are related, not by a scalar permeability, but by a tensor of the form: where z is the direction of the magnetization1. If a plane wave is propagated along the z direction and is circularly polarized, the permeability associated with the transverse components in the xy plane assumes the form: where the sign depends on the direction of the circular polarization. In many ferrites at 10,000 Mc./s., k is greater than µ and the effective permeability for right-handed polarization about the field direction is negative. The propagation constant, which is proportional to the square root of the permeability, is imaginary and the wave is evanescent.

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  1. 1

    Polder, D., Phil. Mag., 40, 99 (1949).

  2. 2

    Suhl, H., and Walker, L. R., Bell System Tech. J., 33, No. 3, 579.

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  1. Standard Telecommunication Laboratories, Ltd., Progress Way, Great Cambridge Road, Enfield, Middlesex

    • G. H. B. THOMPSON


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