Title :
Ultra wide band elastic resonators and their application: SH0 mode plate wave resonators with ultra wide bandwidth of 29 %
Author :
Kadota, Michio ; Ogami, Takashi ; Kimura, Tetsuya
Author_Institution :
Kadota Lab., Murata Manuf. Co. Ltd., Yasu, Japan
Abstract :
Currently, an ultra wide band resonator to realize a tunable filter with a wide tunable range is strongly required, because a mobile phone with multi-bands and a cognitive radio system require such tunable filters to simplify their circuits. This time, authors realized resonators with ultra wide bandwidths of 26 to 29 % and a large impedance ratio of 92 to 98 dB between resonant and anti-resonant frequencies using an SH0 plate wave in a LiNbO3 plate. In addition, a band pass type tunable filter with a tunable range of 16 to 18 % was realized using the resonators.
Keywords :
acoustic impedance; band-pass filters; lithium compounds; surface acoustic wave filters; surface acoustic wave resonators; LiNbO3; SH0 mode plate wave resonators; antiresonant frequencies; band pass type tunable filter; cognitive radio system; impedance ratio; mobile phone; multibands radio system; resonant frequencies; ultrawide band elastic resonators; ultrawide bandwidths; Band pass filters; Bandwidth; Couplings; Electrodes; Lithium niobate; Resonant frequency; Resonator filters; SH0 mode; band pass type tunable filter; plate wave; ultra wide band;
Conference_Titel :
Applications of Ferroelectrics held jointly with 2012 European Conference on the Applications of Polar Dielectrics and 2012 International Symp Piezoresponse Force Microscopy and Nanoscale Phenomena in Polar Materials (ISAF/ECAPD/PFM), 2012 Intl Symp
Conference_Location :
Aveiro
Print_ISBN :
978-1-4673-2668-1
DOI :
10.1109/ISAF.2012.6297740
