composite formed by bivo 4 (bvo) and zinc oxide (zno) with resonant frequency temperature coefficient (t f) close to zero to operate in the microwave range

摘要

In this patent a composite of a BiVO4 monoclinic scheelite (BVO) with zinc oxide (ZnO) in the proportions of 25%, 50%, 75%, 95% and 98% was manufactured and studied in the microwave region. The temperature coefficient of the resonant frequency (τf) presented very relevant values, mainly for the 98% composite, where it obtained τf very close to zero (4.40 ppm / ° C). These composites showed a permittivity variation between 15 and 6, caused by the characteristics of the composite and stable dielectric losses in the order of 10-2, it is worth considering that with the increase in the percentages of zinc oxide, the dielectric loss maintained the order of magnitude in all samples. This set of properties, of stable behavior in relation to temperature variation is proven and shown by the temperature coefficient of the resonant frequency and these properties of the composite ensure that it can be used safely for the proper functioning of components in microwave circuits , dielectric resonating antenna (DRA), in addition to other electronic components of great importance used in microelectronics.