The Quarterly Journal of Mechanics and Applied Mathematics 1958 11(1):112-118; doi:10.1093/qjmam/11.1.112
© 1958 by Oxford University Press
ON THE THEORY OF ANISOTROPIC OBSTACLES IN CAVITIES
WALTER HAUSER
(
Staff Member, Lincoln Laboratory, M. I.T. Lexington Massachusetts
)
Variational expressions for the resonant frequencies of a cavity containing a material with tensor electromagnetic properties are derived. The relationship of the variational expressions to the Bethe-Schwinger perturbation formula is shown. The advantage of this method over the Bethe-Schwinger perturbation method is discussed.

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