Complex permittivities of cyclomaltooligosaccharides (cyclodextrins) over microwave frequencies to 26 GHz

Complex permittivities (ε*) for microwave radiation between 0.5 and 26 GHz have been determined for α-, β-, and γ-cyclodextrins in the solid state at room temperature. For the real component of ε*, maxima occur near 0.6 GHz, and the relation β>α>γ is evident across the full-frequency spectrum. Dielectric loss is significant only between 5 and 12 GHz for β- and γ-cyclodextrins with maxima near 7.5 GHz.