Acoustic Multistrip Device Techniques.
Abstract
The report describes the results of a study of acoustic multistrip coupler (MSC) devices and techniques. A generalized, normal mode field model was developed which successfully predicts the transfer characteristics of multistrip couplers of arbitrary geometrical and material properties. When applied to MSC components requiring fractional transfer efficiency, especially the -3db coupler, it was found that the response characteristics could be conveniently modified by varying the stripe spacings in each track of the coupler. Specifically, fractional efficiency couplers with broad, symmetrical passbands were predicted and demonstrated experimentally. A technique for minimizing radiation losses in the interconnection regions of MSC components by machining a cavity in the piezoelectric substrate under the interconnection region and replacing it with a nonpiezoelectric filler was also investigated, but it was unsuccessful primarily due to the nonuniformity of filler and substrate material thermal expansion coefficients.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1975
- Accession Number
- ADA011345
Entities
People
- C. W. Chapman
- T. W. Bristol
Organizations
- Hughes Aircraft Company