Title :
SAW devices on lithium tetraborate (Li2B4O 7)
Author :
Abe, Hidenori ; Ohmura, Masashi ; Saitou, Hisatoshi
Author_Institution :
Div. of O&E Components, Japan Energy Corp., Saitama, Japan
Abstract :
A 45° rotated X cut, Z propagation Li2B4O7 substrate has attracted attention as a piezoelectric substrate for SAW devices. The substrate is advantageous not for SAW transversal filter but for SAW resonator and resonator filter applications. It is especially suitable for SAW resonator filters which have the relative bandwidth of 0.3% to 0.6% considering coupling coefficient and temperature coefficient of delay. Also, the chip size of SAW resonator filters can be reduced because of the large reflection coefficient for aluminum strips on Li2B 4O7 substrates. SAW resonator filters which have low insertion loss, high rejection level and small size are reviewed and described for pager, CTI, GSM and cordless telephone receiver applications. Moreover, the fabrication process for Li2B4O7 substrates is also mentioned
Keywords :
interdigital transducers; lithium compounds; piezoelectric materials; substrates; surface acoustic wave resonator filters; Al; CTI; GSM; Li2B4O7; Li2B4O7 substrate; SAW resonator filters; Z propagation Li2B4O7 substrate; aluminum strips; cordless telephone receiver; coupling coefficient; delay; fabrication; insertion loss; multielectrodes; pager; piezoelectric substrate; rejection level; rotated X cut substrate; temperature coefficient; Bandwidth; Delay; Lithium; Piezoelectric devices; Reflection; Resonator filters; Surface acoustic wave devices; Surface acoustic waves; Temperature; Transversal filters;
Conference_Titel :
Frequency Control Symposium, 1994. 48th., Proceedings of the 1994 IEEE International
Conference_Location :
Boston, MA
Print_ISBN :
0-7803-1945-1
DOI :
10.1109/FREQ.1994.398322
