Uma Nova abordagem para o projeto e simulação numérica do comportamento de filtros helicoidais na faixa de VHF

Abstract

Abstract:

The dissertation develops a study based on the project and the determination of an equivalent passive circuit lumped suitable for numerical simulation of the behavior bandpass coupled helical resonators cascaded. a condensation of the existing literature was made, structuring a sequence of appropriate design to implementation, from which a program was developed in MATLAB. Depending on the materials available in the domestic market, set up an assembly process from a prototype, by implementing some tuning mechanisms of resonators and coupling opening match between cavities. With the prototype developed, numerical simulations and experimental tests, if allowed realize the representative theoretical modeling device behavior. It sought to bind the distribution of the electromagnetic field in the cavity with an electrical equivalent circuit, where the dimensional characteristics of the coupling window between resonators is represented by reactive circuit elements in concentrated parameters. The equivalent circuit was simulated using the Advanced Design System software - ADS, Agilent, obtaining results similar specifications to MATLAB calculated and experimental measurements. In conclusion, this work provides a design procedure and numerical simulation can assist in the development stage and industrial performance of this type of filter