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

fYear

2009

fDate

17-20 Dec. 2009

Firstpage

43

Lastpage

43

Abstract

A surface acoustic wave (SAW) delay line structure was fabricated by using the XY112Â°-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 Â¿ 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;

fLanguage

English

Publisher

ieee

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

Type

conf

DOI

10.1109/SPAWDA.2009.5428959

Filename

5428959