On the Fundamental Mode Love Wave in Devices Incorporating Thick Viscoelastic Layers

• 作 者: 刘建生 王立君 何世堂
• 机 构: Institute of Acoustics,Chinese Academy of Sciences,
• 出 处: Chinese Physics Letters
• 发表日期: 2015年06期
• 关键词: insertion quartz viscoelastic thick guiding transducers branch coated constants

A detailed investigation is presented for Love waves(LWs) with thick viscoelastic guiding layers.A theoretical calculation and an experiment are carried out for LW devices incorporating an SU-8 guiding layer,an ST-90° X quartz substrate and two 28-μm periodic interdigital transducers.Both the calculated and the measured results show an increase in propagation velocity when h/λ > 0.05.The measured insertion loss of LWs is consistent with the calculated propagation loss.The insertion loss of bulk waves is also measured and is compared with that of LWs.

A detailed investigation is presented for Love waves (LWs) with thick viscoelastic guiding layers. A theoretical calculation and an experiment are carried out for LW devices incorporating an SU-8 guiding layer, an ST-90 ° X quartz substrate and two 28-μm periodic interdigital transducers. But the measured results show an increase in propagation velocity when h / λ> 0.05. The measured insertion loss of LWs is consistent with the calculated propagation loss. The insertion loss of bulk waves is also measured and is compared with that of LWs.