Surface acoustic wave resonator filters using tapered gratings
- 1 September 1978
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Sonics and Ultrasonics
- Vol. 25 (5), 313-319
- https://doi.org/10.1109/T-SU.1978.31033
Abstract
Tapered gratings are used to form SAW resonators with improved filter response and correspondingly relaxed design limitations. Tapering on only one end is showtno smooth out ther eflection sidelobes of the grating and eliminate the out-of-band amplitude and phase ripple of resonator filters. Further, near the reflection banedd ge, the reflection phase varies more slowly than that of a uniform gratiig thereby allowing ala rger grating separation without introducing spurious longitudinal resonator modes. Gratings tapered symmetrically to zero at both endhsa ve very low reflection sidelobes but are shown to have a large reflection phase-shift that leads to multimode resonators For singlemode resonators therefore, asymmetrical tapers ainrve estigated as a compromise between sidelobel evel and reflection phaseshift. Strongly coupled two- and three-cavity, multistrip-coupled resonator cascades are fabricated to demonstrate the filter sidelobe suppression obtained using tapered gratings.Keywords
This publication has 19 references indexed in Scilit:
- Reflection spectrum distortion due to Bragg-frequency variation in tapered highly reflective surface-wave gratingsApplied Physics Letters, 1977
- Coupled Surface-Acoustic-Wave ResonatorsBell System Technical Journal, 1977
- Sidelobe suppression in corrugated-waveguide filtersOptics Letters, 1977
- Suppression of bulk-scattering loss at s.a.w.-resonator reflectorsElectronics Letters, 1977
- Multistrip coupling to SAW resonatorsApplied Physics Letters, 1976
- Properties of Reflective Arrays for Surface Acoustic ResonatorsIEEE Transactions on Sonics and Ultrasonics, 1976
- Surface acoustic wave reflective dot array (RDA)Applied Physics Letters, 1976
- Filter Response of Nonuniform Almost-Periodic StructuresBell System Technical Journal, 1976
- Reflection-Dependent Coupling Between Grating ResonatorsPublished by Institute of Electrical and Electronics Engineers (IEEE) ,1976
- Surface Wave ResonatorsPublished by Institute of Electrical and Electronics Engineers (IEEE) ,1975