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Design optimization and implementation of bandpass filters with normally fed microstrip resonators loaded by high-permittivity dielectric

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4 Author(s)
Hennings, Alexander ; Inst. fuer Werkstoffe der Elektrotechnik, Tech. Univ. Rheinisch-Westfaelische Tech. Hochschule Aachen, Germany ; Semouchkina, E. ; Baker, A. ; Semouchkin, G.

Different approaches for designing bandpass filters with transmission zeroes are investigated by using the transmission-line theory and the finite-difference time-domain method. The filters are composed of capacitively coupled uniform impedance microstrip resonators, stepped-impedance microstrip resonators, and tapped feed lines. Different design modifications are discussed and, as a result, a design with double-coupled resonators is proposed. Based on this structure, a miniaturized filter capacitively loaded by high-permittivity dielectric inclusions and fabricated by using low-temperature co-fired ceramic (LTCC) technology is presented. The measured and simulated S-parameter spectra of the LTCC-filter are in good agreement.

Published in:

Microwave Theory and Techniques, IEEE Transactions on  (Volume:54 ,  Issue: 3 )

Date of Publication:

March 2006

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