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Effects of dielectric substrates on piezoelectric transducer tunable filter
Author(s) -
Cao Liangzu,
Yan Junmei,
Yin Lixia
Publication year - 2019
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.31895
Subject(s) - materials science , dielectric , resonator , coupling coefficient of resonators , band pass filter , piezoelectricity , optoelectronics , transducer , capacitive sensing , microstrip , electromechanical coupling coefficient , coupling (piping) , capacitive coupling , filter (signal processing) , substrate (aquarium) , electronic engineering , acoustics , electrical engineering , voltage , physics , engineering , composite material , oceanography , metallurgy , geology
This article represents the effects of dielectric substrates on the performances of piezoelectric transducer (PET) tunable bandpass filters. The filter consists of two open loop resonators that are coupled by a magnetic coupling. A capacitive cross coupling between input and output port is introduced, which produces two transmission zeros in the lower and upper stopbands. Three dielectric substrates with various dielectric constants are used as perturbers, and their effects on the coupling coefficient and quality factor of the microstrip filter are analyzed. A PET tunable filter with each substrate as a perturber is fabricated and measured.