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Quarter-Wavelength Coupled Dielectric Plate Resonators for High Selectivity TE10-Mode Filters

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2 Author(s)

An analysis of high selectivity TE10-mode filters with quarter-wavelength coupled resonators formed by axially spaced dielectric plates is presented and shows that high-loaded quality factors of individual resonators can be obtained by placing the resonant frequency close to the waveguide cutoff frequency and by using low-loss Iow-dielectric constant materials. Design equations for Butterworth and Chebyschev filters are presented and employed in a three-cavity Butterworth filter having 30-MHz bandwidth at resonant frequency at 7250 MHz. Experimental results show that filter performance can be well predicted.

Published in:

IEEE Transactions on Microwave Theory and Techniques  (Volume:28 ,  Issue: 4 )