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Compact interdigital filters with transmission zeros in LTCC technology
Author(s) -
LópezBerrocal B.,
deOlivaRubio J.,
MolinaFernández I.,
MontejoGarai José R.
Publication year - 2014
Publication title -
international journal of rf and microwave computer‐aided engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.335
H-Index - 39
eISSN - 1099-047X
pISSN - 1096-4290
DOI - 10.1002/mmce.20799
Subject(s) - stripline , resonator , band pass filter , microwave , electronic engineering , topology (electrical circuits) , coupling (piping) , ceramic , materials science , engineering , electrical engineering , optoelectronics , telecommunications , mechanical engineering , composite material
This article presents a simple topology for the implementation of cross‐couplings between nonadjacent resonators in interdigital stripline filters. This topology affords the inclusion of transmission zeros maintaining a cross‐sectional structure similar to that of a stripline. Therefore, the manufacturing cost is very close to an all‐pole prototype. Two design strategies for the coupling structure are discussed: one of them achieving filters with enhanced performance. Both strategies have been assessed implementing prototypes in low‐temperature cofired ceramic (LTCC) technology. The fabricated filters exhibit operating frequencies at 5775 MHz and 8000 MHz with 2.6% and 3.75% pass‐band fractional bandwidths, respectively, and up to 60 dB IL in the rejection band. © 2014 Wiley Periodicals, Inc. Int J RF and Microwave CAE 24:560–570, 2014.