Analysis of a composite dielectric-ferrite loaded resonator using the transmission line model with application to a tunable dual mode bandpass filter

A magnetically tuned filter is presented in this dissertation. Filter tuning of a dielectric ceramic resonator is accomplished using by using two oppositely biased ferrites. Specifically, a change in the applied magnetic field is used to alter the permeability of the ferrite so as to achieve maximum tuning range. Through electromagnetic (EM) simulations and laboratory experiments, tuning of the filter passband by 20 MHz is demonstrated. This investigation focuses on the design of a bandpass resonator using a combination of dielectric-ferrite material layers. An initial simplification of the geometry of the structure is used as the basis for a program developed to give a fast frequency analysis using the Transmission Line Method (TLM). The TLM analysis is compared to a full wave EM simulation as well as results from the Experimental Model to insure compliance and validation. A suggestion is included to improve and modify the initial Experimental Model using the applied bias to optimize the frequency shift and bandwidth performance.

Name thesis:degree_name

Doctor of Philosophy in Electrical Engineering - (Ph.D.)

Discipline thesis:degree_discipline

Electrical and Computer Engineering

Year

2012

Author dc:creator

• Blair, Charlotte

Contributors dc:contributor

• Edip Niver
• Richard V. Snyder
• Gerald Martin Whitman

• Dual mode bandpass filter
• TLM
• Dielectric resonator
• Tunable filter
• Electrical and Electronics

Repository record dc:identifier

https://digitalcommons.njit.edu/dissertations/337

OAI identifier oai:identifier

oai:digitalcommons.njit.edu:dissertations-1392