Effects Of Bulk And MOCVD Thin Film Cover On The Characteristics Of Microstrip Resonators

Abstract

Shift in the resonance frequency and an increase in the Q factor of microstrip resonators in the presence of dielectric cover are observed in the frequency range of 2- 26GHz. Various microwave materials are used as a dielectric cover which include bulk alumina, semi-insulating GaAs, RT-Duroid and MOCVD A1203 thin film. Increase in the Q factor is found to vary between 103% to 769% depending upon the cover permittivity and thickness. A process has been proposed to fabricate mu1 tilayer homogeineous microstrip using thin film alumina as a cover material giving rise to increase in the quality factor by 137% to 259 % .