1985
DOI: 10.1049/ip-h-2.1985.0005
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Permittivity measurements using a frequency-tuned microwave TE01 cavity resonator

Abstract: A measuring system for determining the complex permittivity of low-loss solids using a frequencytuned TE 01 cavity resonator of fixed length is described. Its mechanical construction is simple, and measurements, in particular of the real part e' of the permittivity, can be performed within a relatively short measuring time with high precision (| Ae'/e' | < 7 x 10~4), for a large number of frequencies in a given frequency band. The method is compared with the standard method where a length-tuned resonator is in… Show more

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Cited by 15 publications
(7 citation statements)
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“…(1) and (2) reduce to H(p, 0, z) = [hr(p, 0) + h z (p, 0)] exp(-^z) (3) and E(p, 0, z) = [e T (p, 0) + e 2 (p, 0)] exp(-j^). (4) Since the longitudinal electric field (5) where u is the frequency in radians, po is the permeability of free space, eo is the permittivity of free space, and e a is the relative permittivity of the air inside the waveguide.…”
Section: Cylindrical Cavity Specificationsmentioning
confidence: 99%
See 1 more Smart Citation
“…(1) and (2) reduce to H(p, 0, z) = [hr(p, 0) + h z (p, 0)] exp(-^z) (3) and E(p, 0, z) = [e T (p, 0) + e 2 (p, 0)] exp(-j^). (4) Since the longitudinal electric field (5) where u is the frequency in radians, po is the permeability of free space, eo is the permittivity of free space, and e a is the relative permittivity of the air inside the waveguide.…”
Section: Cylindrical Cavity Specificationsmentioning
confidence: 99%
“…In order to minimize the effect of this gap and the imperfections of the machining process on the sample's top and bottom surface, we specified the sample thickness to be an integer multiple of half-wavelengths in the sample, thus forcing the electric field to be nearly zero on both the top and bottom surfaces of the sample. References [3] and [4] show that the uncertainty in the sample permittivity due to uncertainty in the sample Figure 9). In addition, the sample radius was measured eight times using a caliper.…”
Section: Solution For )mentioning
confidence: 99%
“…Substituting (2) and 3into (1) we obtain (8) At resonance , the transmission loss reduces to (9) Taking the ratio of we obtain (10) Note that, in practice, the unloaded quality factor is larger than the measured quality factor due to the effects of the coupling loops (11) However, if we reduce the coupling level so that the cylindrical cavity is very undercoupled ( and ), we can neglect the coupling factors and and rewrite (10) as 12with the assumption that the measured quality factor is approximately . (If coupling cannot be ignored, see [7] for methods of calculating and .)…”
Section: Resonance Curve Modelmentioning
confidence: 99%
“…These are requisite for the determination of specimen dielectric loss tangent. From continuity conditions 17) (18where (19) (20) and 21Neglecting the subscript on , the field components for the sample region are In general, is given as , where represents the total electric field energy in the resonant system and represents all power losses in the resonant system. The total electric field energy consists of that stored in the specimen, , that in the sleeve resonator, , and that in the region exterior to the composite dielectric resonator in the cylindrical cavity, .…”
Section: B Dielectric Loss Tangentmentioning
confidence: 99%