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High Q-factor compact filters with wide-band spurious rejection

Published online by Cambridge University Press:  07 August 2013

Fabrizio Gentili ,
Giovanni Bianchi ,
Luca Pelliccia  and
Roberto Sorrentino
Fabrizio Gentili*
Affiliation:
DIEI, Electronic and Information Engineering Department, University of Perugia, Via G. Duranti 93, Perugia 06125, Italy. Phone: + 39 075 585 3661
Giovanni Bianchi
Affiliation:
Advantest Europe GmbH, Herrenberger Street 130, Böblingen 71034, Germany
Luca Pelliccia
Affiliation:
DIEI, Electronic and Information Engineering Department, University of Perugia, Via G. Duranti 93, Perugia 06125, Italy. Phone: + 39 075 585 3661
Roberto Sorrentino
Affiliation:
DIEI, Electronic and Information Engineering Department, University of Perugia, Via G. Duranti 93, Perugia 06125, Italy. Phone: + 39 075 585 3661
*
Corresponding author: F. Gentili Email: fabrizio.gentili@diei.unipg.it
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Abstract

A stepped-impedance configuration for coaxial resonators is employed to realize filters in the L-, S-, and C-bands exhibiting a wide spurious-free range. The geometry of a single rod resonator is optimized, by enlarging its top head, in order to maximize the ratio between the frequency of the first higher-order mode and that of the fundamental mode. This leads to the design of a very compact filter with high Q-factors and wide spurious-free bands, up to nearly 5 times the center frequency. To prove the effectiveness of the approach, a sixth-order filter has been designed and manufactured; the comparison between the full-wave simulations and the measurement show excellent agreement.

Keywords

Passive components and circuitsFilters
Type
Research Papers
Information
International Journal of Microwave and Wireless Technologies , Volume 5 , Issue 6 , December 2013 , pp. 729 - 733
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2013 

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References

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