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Ultra-compact high-performance filters based on TM dual-mode dielectric-loaded cavities

Published online by Cambridge University Press:  03 December 2013


Luca Pelliccia
Affiliation:
RF Microtech Srl, Via P. Mascagni 11, Perugia 06132, Italy. Phone: +39 075 52 71 436
Fabrizio Cacciamani
Affiliation:
Electronic and Information Engineering Department (DIEI), University of Perugia, Via G. Duranti 93, Perugia 06125, Italy
Cristiano Tomassoni
Affiliation:
Electronic and Information Engineering Department (DIEI), University of Perugia, Via G. Duranti 93, Perugia 06125, Italy
Roberto Sorrentino
Affiliation:
Electronic and Information Engineering Department (DIEI), University of Perugia, Via G. Duranti 93, Perugia 06125, Italy
Corresponding
E-mail address:

Abstract

Ultra-compact band-pass filters with Nth-order pseudoelliptic response are presented allowing dramatic volume and mass savings (up to about 90%) compared to conventional filters at the price of a modest Q-factor reduction. TM dual-mode cavities loaded with high-permittivity (εr > 30) ceramic cylinders are employed, while non-resonating modes are used to create N transmission zeros symmetrically or non-symmetrically located in the pass-band. A single cavity behaves as a generalized doublet generating two transmission poles and two transmission zeros and is used as a basic building block for N-pole and N-zero filters with symmetric or asymmetric response. To prove the effectiveness of the approach, a very compact fourth-order filter with 4.35 GHz center frequency, four transmission zeros has been designed, fabricated, and tested showing an unloaded Q close to 2000. It is finally shown that the filter response can be shifted in frequency by simply replacing the dielectric material with another having different εr, so that the same metal enclosure can be used to realize various filters operating at different frequency bands.


Type
Research Paper
Copyright
Copyright © Cambridge University Press and the European Microwave Association 2013 

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References

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