Analysis of slotted cylindrical ring resonators

Abstract

Advances in mobile technology, due to the rapid growth of mobile wireless systems, coupled with stringent selectivity requirements, have led to the need for smaller and lighter high quality filters. The slotted cylindrical ring resonator is one resonator considered promising in the development of high quality compact filters for mobile communication systems due to its small size and medium to high Q-factor [1]. In this paper the Transmission Line Modeling method is used to determine the effects of using a high dielectric constant material on the size and coupling constant of the resonator. Modeling and simulations are done using Microstripes, a commercial TLM field solver from Flomerics. The paper shows that by placing a high dielectric constant material in the resonator gap the resonant size is decreased and the coupling improved.

Keywords: Slotted cylindrical ring resonator, resonant frequency, electric coupling, magnetic coupling, Transmission line modeling