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Magnetically tunable filters for cellular communication terminals

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3 Author(s)
Krupka, J. ; Dept. of Electron. & Inf. Technol., Warsaw Univ. of Technol. ; Abramowicz, A. ; Derzakowski, K.

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)

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Microwave Theory and Techniques, IEEE Transactions on  (Volume:54 ,  Issue: 6 )