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- W2983492030 abstract "An analysis is presented of field perturbations in MIC resonators in order to examine tbe errors which occur in permittivity measurements made by cavity-resonance methods: Q factor, cou- pling effects, fringing fields, crystal misalignment (for anisotropic materials), and changes in ambient temperature are all considered. Analysis of a cavity with mixed boundary conditions shows that the resonant-mode frequencies depend to the first order on that part of QO associated with imperfect electric (metal) walls, but to the second order on that part associated with imperfect magnetic (open-circuit) walls. Anew expression is given for the Q of an open-ended microstrip resonator when surface waves are excited iu the dielectric, aud it is shown that the uuloaded Q (Qo) cau be domiuated by this phen- omenon. It is further shown that these Q-related effects, together with reactive perturbations arising from fringing and coupling structures, are the principal source of error iu measurements for e or t ,fr. Such reactive effects may be treated semiquantitatively by applying Slater's perturbation theorem to tbe affected region. These procedures lead to the following revised values for the crystal permittivity of sapphire (monocrystalline A1203) in the microwave region: s,, (parallel to the c axis) = 11.6; Cl (base-plane) = 9.4." @default.
- W2983492030 created "2019-11-22" @default.
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- W2983492030 date "1977-01-01" @default.
- W2983492030 modified "2023-09-24" @default.
- W2983492030 title "Some Effects of Field Perturbation upon Cavity-Resonance and Dispersion Measurements on MIC Dielectrics" @default.
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- W2983492030 hasPublicationYear "1977" @default.
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