Analysis of field distribution of a dielectric resonator and its applications

Author

Manohar R. Kamath, New Jersey Institute of Technology

Document Type

Thesis

Date of Award

12-31-1990

Degree Name

Master of Science in Electrical Engineering - (M.S.)

Department

Electrical and Computer Engineering

First Advisor

Tushar Bhattacharjee

Second Advisor

Edip Niver

Third Advisor

N. M. Ravindra

Abstract

Dielectric resonators (DR) are suitably shaped objects made of high dielectric constant materials like TiO₂, BaO, ZnO, and accessory ingredients, which can function as electrical resonators covering a very wide frequency range upto 40GHz. The physical dimensions of dielectric resonators are in mm range. High dielectric constant material resonators seem to be ideally suited for microwave applications because of their miniature size, low loss, insensitivity to magnetic dc biasing fields, and ability to concentrate large RF magnetic fields in small volumes. However temperature stabilization of dielectric resonators is an important consideration as the center frequency is a function of temperature. The present dissertation describes the the-oretical analysis of such DR's based on two different mathematical and physical models. These models present a simplified approach to the solution of the electromagnetic field behaviour in the DR, and are capable of giving results which are near to the exact values.

One of the practical applications of such DR's is an oscillator. Here in this thesis report, the dynamic characteristics of a GaAsFET oscillator have also been investigated in details. Especially, studies have been made about the stabilized oscillator temperature coefficient, maximum frequency deviation and the pushing figure as a function of the coupling coefficient. These results would be useful for precise custom made design of such oscillators. Finally, the effects of the environmental conditions on the operation of a practical DR structure are studied by using a computer sim-ulation technique. The study is based on approximate expression for the resonant frequency stability of dielectric resonators.

Recommended Citation

Kamath, Manohar R., "Analysis of field distribution of a dielectric resonator and its applications" (1990). Theses. 2773.
https://digitalcommons.njit.edu/theses/2773