Piezoelectric and ferroelectric devices
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Theoretical results of acoustic-surface-wave (a.s.w.) zero-frequency-temperature-coefficient (f.t.c.) configurations in Tl3TaSe4 are discussed. Six selected cuts with an electromechanical coupling coefficient of up to 4% are described, as well as a zero-f.t.c. and zero-power-flow-angle cut with 2% coupling.
Theoretical results are presented for the piezoelectric coupling of a surface-acoustic-wave thin-film transducer on a silicon substrate having a nonzero electrical conductivity. It is shown that, for specific combinations of the material layer thicknesses, this conductivity disappears. Also, under certain conditions, the enhancement in the piezoelectric coupling is degraded.
Gratings of finite width provide wave guidance by means of reflection from the grating boundaries. Measured mode patterns are compared with the theoretically predicted patterns, and good agreement is found.
An equivalent circuit is described for a surface-acoustic-wave delay line utilising interdigital transducers in a multilayered medium with a conductive silicon substrate. Attention is paid to practical material parameters for the ultimate realisation of the monolithic integration of surface-acoustic-wave and electronic components on the same silicon slice.
By correlating during read-in, we correlate signals of much greater length than could be stored within the device, thereby obtaining a large improvement in t.b. product.
A design procedure is given for cascades of grating resonators to construct Tchebysheff, Butterworth, Gaussian, Legendre and other passband filters.
The letter describes a technique which can be used to compensate for losses in amplitude response induced by beam profile reshaping by a multistrip coupler when used with weighted surface-acoustic-wave transducers having large time-band-width products. This is achieved by analytically modifying the conventional weighting of the transducers. Experimental results from two filter designs employing this technique are presented.
A unidirectional surface-acoustic-wave transducer with a sputtered ZnO film on a glass substrate is presented, consisting of interdigital electrodes and a plate electrode on both sides of the film. Experiments are in good agreement with the equivalent-network approach, which is similar to Smith's networks for the normal interdigital transducer.
A new type of unidirectional transducer is proposed and demonstrated. This transducer consists of three electrode groups, one on the bottom surface. The others are interdigital electrode groups 60° out of phase and on the top surface. Better than 20 dB of directionally was obtained for the zeroth symmetrical mode of a Lamb wave.
A simple model of a 2-port s.a.w. filter is given, which agrees well with expperiment. The suppression of spurii is considered.
Theoretical results of acoustic-surface-wave (a.s.w.) zero-frequency-temperature-coefficient (f.t.c.) configurations in TI3 VS4, are discussed. Four selected cuts with an electro-mechanical coupling coefficient of up to 3% are described.
A localised ion-beam milling has been used to increase the fundamental frequency of acoustic-bulk-wave resonators. Monolithic filters in lithium niobate (Y+37°) and lithium tantalate (X) operating, respectively, at 220 and 230 MHz have been realised. The relative bandwidth is equal to 1% and the insertion loss is about 4 dB. An a.t.-cut quartz resonator working in the fundamental mode at 270 MHz with a Q-factor of 12 000 has also been obtained. In this case, the vibrating membrane is 6 μm thick, with a centre portion of diameter 2.5 mm.
The letter deals with the frequency response of a surface-acoustic-wave filter which uses a waveguide between the input and output transducers. The overall frequency response is shown always to be a product of the frequency response of the input and output transducers, even when both of the transducers consist of overlap weighted interdigital electrodes.
The s.a.w. reflection coefficient of the metal strip has been measured on y-cut LiNbO3 for waves reflected through 90° from the z into the x direction. The maximum value of the reflection coefficient of a metal strip is 0.020, when the width/periodicity ratio of the metal strips is about 0.3.
An important new family of acoustic wave devices is described which has the simplicity, versatility and planar construction of s.a.w. devices, together with the attractive properties of bulk-wave devices, including high velocity, low attenuation, good temperature stability and insensitivity to surface contamination.
