Universal method for compensation of SAW diffraction and other second order effects
Abstract
All known methods for diffraction compensation replace this unapodized transducer by a single tap. This assumption neglects variations of the SAW beam profile over the length of the unapodized transducer and leads to unsatisfying results of the compensation procedure in many cases of interest. Our compensation algorithm computes corrections to the taps of the apodized transducer from the deviations of the analyzed frequency response (including second order effects) from the desired response, using a quasi-Newton-optimization method which takes the unapodized transducer into consideration. This method was successfuly applied to remove diffraction effects from analyzed and measured frequency responses, however, the same method can be applied to other second order effects as well.
- Publication:
-
1982 Ultrasonics Symposium
- Pub Date:
- October 1982
- Bibcode:
- 1982ultr.sympQ....M
- Keywords:
-
- Bandpass Filters;
- Frequency Response;
- Surface Acoustic Wave Devices;
- Wave Diffraction;
- Computer Aided Design;
- Newton Methods;
- Optimization;
- Electronics and Electrical Engineering