Title :
Theory and applications of RMSC
Author_Institution :
Inst. of Fundamental Technol. Res., Acad. of Sci., Warsaw, Poland
Abstract :
A theory for the reversing multistrip coupler (RMSC) is presented based on the previously developed spectral theory of interdigital transducers (IDTs). It shows that the track-changing reflection of a surface acoustic wave (SAW) in an RMSC depends on the frequency-like reflection of SAWs from ordinary periodic grating reflectors. The reflection to the other channel is full in a narrow frequency band of relative width 2/3Δν/ν if the RMSC is sufficiently long. Some applications of the RMSC are discussed, including SAW dispersive filters, resonators and low-loss filters. A new dispersive interdigital transducer having substantial apodization that reduces spurious passband is proposed
Keywords :
acoustic resonators; surface acoustic wave devices; surface acoustic wave filters; ultrasonic transducers; apodization; dispersive filters; frequency-like reflection; interdigital transducers; low-loss filters; periodic grating reflectors; resonators; reversing multistrip coupler; spectral theory; spurious passband; surface acoustic wave; track-changing reflection; Acoustic reflection; Acoustic transducers; Acoustic waves; Band pass filters; Dispersion; Frequency; Gratings; Passband; Resonator filters; Surface acoustic waves;
Conference_Titel :
Ultrasonics Symposium, 1992. Proceedings., IEEE 1992
Conference_Location :
Tucson, AZ
Print_ISBN :
0-7803-0562-0
DOI :
10.1109/ULTSYM.1992.276038
