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Resonators and waveguides containing a region of high dielectric constant are considered. The dielectric constant is first assumed to be infinite, but is later given a high, but finite value. Perturbation formulas are derived for the resulting shift in either the resonant frequency of the resonator or the wavenumber of the waveguide mode.
Microwave Theory and Techniques, IEEE Transactions on (Volume:22 , Issue: 1 )
Date of Publication: Jan 1974