TITLE

In situ compensation of surface acoustic wave filter response

AUTHOR(S)
Cohn, R. W.; Wagers, R. S.
PUB. DATE
December 1985
SOURCE
Applied Physics Letters;12/15/1985, Vol. 47 Issue 12, p1269
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
An experimental methodology is demonstrated for compensating the response of surface acoustic wave (SAW) bandpass filters. For a filter on (YZ) LiNbO[sub 3], we present measurements of changes in the SAW impulse and frequency response produced by in situ perturbations to the transducer's apodization. Many transducer electrodes are perturbed in their length to determine filter sensitivity to electrode length variation. A methodology that is adaptive in these length variables is applied to determine the optimal apodization for the compensation of frequency domain sidelobes initially at the - 26 dB level. They are deterministically reduced to the - 39 dB level.
ACCESSION #
9818721

 

Related Articles

  • FILTERS. Aikin, Jim // Keyboard;Nov2006, Vol. 32 Issue 11, p48 

    The article provides information on filters and gives a brief background of the science of acoustics. There are several types of filters which include the bandpass filter and the notch filter. Filters also have parameters such as resonance and overdrive. There are various sources of filter...

  • Phase variation of focused surface acoustic wave. Jen, C. K.; Cielo, P.; Bussiere, J.; Nadeau, F.; Farnell, G. W. // Applied Physics Letters;2/1/1985, Vol. 46 Issue 3, p241 

    Converging and diverging surface acoustic waves (SAW) have been generated and detected using a noncontacting method. A yttrium aluminum garnet laser together with an axicon lens produces a focused optical ring which excites both converging and diverging SAW on the test sample. An optical...

  • Spatially resolved photoluminescence in GaAs surface acoustic wave structures. Santos, P. V.; Ramsteiner, M.; Jungnickel, F. // Applied Physics Letters;4/27/1998, Vol. 72 Issue 17 

    The interaction between a surface acoustic wave (SAW) and the excitonic photoluminescence (PL) in GaAs SAW structures is investigated. The dependence of the PL on the SAW amplitude and illumination intensity is explained by a simple model based on the field-induced ionization of the excitons and...

  • Giant surface acoustic waves generated by a multiple beam laser: Application to the detection of.... Chenu, C.; Noroy, M.-H. // Applied Physics Letters;8/29/1994, Vol. 65 Issue 9, p1091 

    Details the generation of giant surface acoustic wave pulses by implementing an array thermoelastic sources on the surface of a solid. Introduction of the delays between the laser emission time; Detection of mechanical displacements; Presentation of examples of noncontact and nondestructive...

  • Point contact ultrasonic transducer of waveguiding structure for high-frequency operation. Yamada, Ken; Khuri-Yakub, Butrus T. // Applied Physics Letters;3/4/1996, Vol. 68 Issue 10, p1335 

    Presents Hertzian-contact transducer for high frequency operation. Employment of waveguiding tube in transducer; Fabrication of transducers with fused quartz tubes; Use of transducers for surface acoustic wave excitation.

  • Theoretical analysis of horizontal shear mode piezoelectric surface acoustic waves in potassium.... Nakamura, Kiyoshi; Oshiki, Mitsuhiro // Applied Physics Letters;12/1/1997, Vol. 71 Issue 22, p3203 

    Presents a theoretical analysis of horizontal shear (SH) mode piezoelectric surface acoustic waves (SAW) in potassium niobate. Existence of a SH mode SAW; Decomposition of the particle displacement of the SH mode SAW; Range of the electromechanical coupling factor K[sup 2].

  • Acoustic resonance of the atmosphere at 3.7 mHz. Tahira, Makoto // Journal of the Atmospheric Sciences;8/1/95, Vol. 52 Issue 15, p2670 

    Discusses the vertical propagation of plane acoustic-gravity waves with horizontal wave fronts using a layer model with realistic temperature structure based on the Cospar International Reference Atmosphere, 1986. Occurrence of acoustic resonance in normal mode; Cause of modal resonance in waves.

  • Complete acoustic stop bands for cubic arrays of spherical liquid balloons. Kushwaha, M. S.; Djafari-Rouhani, B. // Journal of Applied Physics;9/15/1996, Vol. 80 Issue 6, p3191 

    Presents information on a study which investigated the acoustic band structures for cubic arrays of spherical water balloons surrounded by a mercury host. Secular equation used to investigate the band structures for longitudinal acoustic waves; Methodology of the study; Results and discussion.

  • High accuracy noncontact laser-optical method for measuring surface acoustic wave velocity and attenuation. Burov, J. I.; Branzalov, K. P.; Ivanov, D. V. // Applied Physics Letters;1/15/1985, Vol. 46 Issue 2, p141 

    A high accuracy noncontact laser-optical method for measuring surface acoustic wave (SAW) velocity and attenuation is described. The accuracy depends on the power of the two lasers, used for generation and probe of SAW and on bandwidth of the intensity modulation. The method is applicable to all...

  • Interaction of laser-generated surface acoustic pulses with fine particles: Surface cleaning and... Kolomenskii, Al. A.; Schuessler, H.A.; Mikhalevich, V.G.; Maznev, A.A. // Journal of Applied Physics;9/1/1998, Vol. 84 Issue 5, p24 

    Focuses on a cleaning technique with laser-generated surface acoustic waves (SAWs) and the mechanism of particle detachment by SAWs. Description of research method utilized; Details on the use of laser-generated SAWs to clean surfaces; Influence of ambient conditions on the removal of particles.

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics