title: Propagation characteristics of longitudinal leaky SAW in Al-grating structure.
abstract: New orientations for longitudinal leaky SAW with small propagation losses and high velocities in lithium niobate (LN) and lithium tantalate (LT) have been found. Their velocities are 6100 to 6500 m/s in LN and 5200 to 5800 m/s in LT. Their propagation losses are almost negligible only in the case of an Al-grating structure. For example, the Al thickness relative to the SAW wavelength must be 8.4% for 171 degrees YZ'-LN; for 133 degrees YZ'-LT, the value must be 9.2%. These propagation properties were obtained by using a simulator that combined both finite-element and analytical methods. These results were also well confirmed by measuring the impedance responses of one-port SAW resonators.
authors.affiliation: Dept. of Commun. Syst. Res., Hitachi Ltd., Tokyo.
authors.forename: A
authors.initials: A
authors.lastname: Isobe
authors.forename: M
authors.initials: M
authors.lastname: Hikita
authors.forename: K
authors.initials: K
authors.lastname: Asai