Measurement of Impedance Mismatch and Stored Energy for Right-Angle Reflection of Rayleigh Waves from Grooves on Y Cut LiNbO3.

Abstract

Arrays of grooves acting as reflective gratings are used in several types of surface wave devices. Each edge of a groove, consisting of a down-step followed by an up-step, reflects a fraction of the incident surface-wave beam. For shallow grooves, most of the reflection is due to the mismatch in the Rayleigh-wave fields on the raised and lowered sides of the step, and the reflection-coefficient due to this effect is proportional to the step height, h. For normal incidence this part of the reflection coefficient has been calculated with a boundary-perturbation technique and has also been modeled as an impedance mismatch in a transmission line. Another important contribution to the reflection from a groove is the energy storage at a step discontinuity.

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Document Details

Document Type
Technical Report
Publication Date
Sep 22, 1975
Accession Number
ADA031714

Entities

People

  • John Melngailis
  • Robert C. M. Li

Organizations

  • Massachusetts Institute of Technology

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Acoustic Waves
  • Amplitude
  • Delay Lines
  • Electrical Measurement
  • Electron Microscopes
  • Energy Storage
  • Frequency
  • Ion Beams
  • Measurement
  • New York
  • Phase Shift
  • Rayleigh Waves
  • Reflection
  • Surface Waves
  • Transducers
  • Transmission Lines
  • Waves

Fields of Study

  • Physics

Readers

  • Electrical Engineering
  • Electromagnetic Wave Scattering and Antenna Radiation Engineering