Accession Number : AD0702776

Title :   SURFACE WAVE DEVICES.

Descriptive Note : Annual technical rept. 15 Jan 69-15 Jan 70,

Corporate Author : TEXAS INSTRUMENTS INC DALLAS

Personal Author(s) : Claiborne,Lewis T. ; Hartmann,Clinton S. ; Jones,W. Stanley

Report Date : MAR 1970

Pagination or Media Count : 147

Abstract : An important aspect of any program for the study of surface waves is calculation of the phase and group velocities and the elastic and electric field patterns. Surface wave propagation has been under investigation both theoretically and experimentally for several substrate materials. A formalism was developed to calculate surface wave phase and group velocities for different crystal symmetries. Of particular interest is the character of the roots of the wave equation for the various regions of 'slowness' space. Convergence of the real and the imaginary parts of the determinant formed from the boundary conditions has been investigated. Of particular interest are the calculations for one new material, Ba2NaNb5O15. Velocity measurements have been made for elastic waves at the surface of CdS, ZnO, LiNbO3, GaAs, Si, and Ba2NaNb5O15. Limited measurements of attenuation have also been made. The spreading of a surface wave beam has been treated in both near and far field regions. The prototype correlation and compression filter studies are discussed. A mathematical model has been formulated for the response of a dispersive surface wave transducer array. Application areas for surface wave matched filters for radar signal processing have been identified.

Descriptors :   (*PIEZOELECTRIC CRYSTALS, ULTRASONIC RADIATION), (*RADAR SIGNALS, *PULSE COMPRESSION), (*CORRELATORS, MICROWAVE FREQUENCY), INTEGRAL TRANSFORMS, PIEZOELECTRIC TRANSDUCERS, DIGITAL SYSTEMS, RADIOFREQUENCY FILTERS, SEMICONDUCTORS, CADMIUM SULFIDES, GALLIUM ARSENIDES, BARIUM COMPOUNDS, SODIUM COMPOUNDS, ZINC COMPOUNDS, NIOBATES, OXIDES, SILICON

Subject Categories : Electrical and Electronic Equipment
      Active & Passive Radar Detection & Equipment
      Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE