Title :
Magnetically tunable filters for cellular communication terminals
Author :
Krupka, Jerzy ; Abramowicz, Adam ; Derzakowski, Krzysztof
Author_Institution :
Dept. of Electron. & Inf. Technol., Warsaw Univ. of Technol.
fDate :
6/1/2006 12:00:00 AM
Abstract :
Magnetically tunable two-pole dielectric-resonator filters containing axially and circumferentially magnetized ferrite elements have been designed and investigated. Employing axially magnetized ferrites, a 20-MHz tuning range was obtained. The Q factor of resonators was 2500 and the tuning power was 1.8 W. Filters containing circumferentially magnetized discs demonstrated a 12-MHz tuning range with the Q factor over 8000 (tuning power 3.5 W) and 28 MHz with the Q factor 3500 (tuning power 3.5 W)
Keywords :
Q-factor; UHF filters; cavity resonator filters; cellular radio; ferrite filters; tuning; waveguide filters; 1.8 W; 12 MHz; 20 MHz; 28 MHz; 3.5 W; Q factor; cellular communication terminals; ferrite loaded resonators; magnetically tunable filters; magnetized ferrite elements; two pole dielectric resonator filters; Dielectric materials; Ferrites; Magnetic materials; Magnetic separation; Manufacturing; Microwave filters; Permeability; Resonator filters; Tensile stress; Tuning; Dielectric resonators; ferrite loaded resonators; filters; tunable filters;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
DOI :
10.1109/TMTT.2006.875268
