Title :
A new method for calculation of reflections in the impulse model using single flow charts [SAW transducer]
Author :
Jüngling, Stephan
Author_Institution :
ETH Inst. for Field Theory & High Frequency Tech., Zurich, Switzerland
Abstract :
A method by which the effects of finger reflections can be included in the impulse model is presented. A numerical technique using signal flow charts (SFC) makes it possible to include mechanical and electrical wave perturbations into the commonly used array factor. The method is valid for varying metallization ratios or dispersive structures as well as for different electrode polarity sequences of electrode connections and their spatial harmonic operation. The SFC algorithm leads to the full three-port description of the transducer. A novel virtual transduction weighting function is presented. It is a characteristic function describing the structure of any reflective transducer and an illustrative result of the SFC algorithm
Keywords :
flowcharting; numerical methods; piezoelectric transducers; surface acoustic wave devices; ultrasonic reflection; ultrasonic transducers; SAW transducer; array factor; dispersive structures; electrical wave perturbations; electrode polarity sequences; finger reflections; impulse model; mechanical perturbations; metallization ratios; numerical technique; reflective transducer; single flow charts; spatial harmonic operation; three-port description; virtual transduction weighting function; Acoustic scattering; Electrodes; Electrostatics; Fingers; Flowcharts; Metallization; Power harmonic filters; Reflection; Surface acoustic waves; Transducers;
Conference_Titel :
Ultrasonics Symposium, 1990. Proceedings., IEEE 1990
Conference_Location :
Honolulu, HI
DOI :
10.1109/ULTSYM.1990.171397
