Title :
Design and research of S-type delay line structures
Author :
Chen, Yeing ; Zhu, Jia-lin ; Li, Yong-gang
Author_Institution :
Coll. of Sci., Beijing Inf. Sci. & Technol. Univ., Beijing, China
Abstract :
A surface acoustic wave (SAW) delay line structure was fabricated by using the XY112°-LiTaO3 as the substrate. We use a double channel structure to minimize the impact of temperature drift, design the delay line as S structure. The interference of body waves is restrained and the signal of three times route is reduced by changing the transmission paths of SAW. In order to obtain better side-lobe inhibition, we tried to restrain harmonics, especially the excitation of the triple harmonics, using single finger interdigital transducer (IDT) with the metallization ratio ¿ as 0.5. By testing, the influence of the temperature drift of SAW oscillator could be decreased, the influence of third-wave reflection and the interference of the BAW could be restrained immensely. This structure plays an extremely important role to improve SAW oscillator frequency stability and measurement output accuracy.
Keywords :
acoustic wave interference; acoustic wave reflection; acoustic wave transmission; frequency stability; interdigital transducers; lithium compounds; metallisation; surface acoustic wave delay lines; surface acoustic wave oscillators; BAW interference; LiTaO3; S-type delay line structures; SAW oscillator; SAW oscillator frequency stability; body wave interference; double channel structure; measurement output accuracy; metallization ratio; restrain harmonics; side-lobe inhibition; single finger interdigital transducer; surface acoustic wave delay line structure; temperature drift; third-wave reflection; triple harmonic excitation; Acoustic waves; Delay lines; Fingers; Interference; Metallization; Oscillators; Surface acoustic waves; Temperature; Testing; Transducers; Surface acoustic wave; delay line; interdigital transducer;
Conference_Titel :
Piezoelectricity, Acoustic Waves, and Device Applications (SPAWDA) and 2009 China Symposium on Frequency Control Technology, Joint Conference of the 2009 Symposium on
Conference_Location :
Wuhan
Print_ISBN :
978-1-4244-4950-7
DOI :
10.1109/SPAWDA.2009.5428959
