Title :
The effect of diffraction on the dispersive delay lines performance
Author :
Milewski, A. ; Gawor, S.
Author_Institution :
Tele & Radio Res. Inst., Warsaw, Poland
Abstract :
This paper describes the influence of the diffraction effect on the compressed signal sidelobes level. The analysis was made using angular spectrum of waves (ASoW) model. This model is very flexible and can be used for various SAW devices. Calculations were carried out for many types of dispersive delay lines with one dispersive and one periodical transducer. The iterative synthesis technique for the correction of diffraction in SAW compressor is described (it will be shown in the first part of the paper that the influence of diffraction on the expander characteristic is usually negligible). Using the results, various pulse-compression and expansion filters were designed and manufactured. A very good agreement between calculations and measurements was observed
Keywords :
iterative methods; surface acoustic wave delay lines; surface acoustic wave filters; surface acoustic wave transducers; ultrasonic diffraction; ultrasonic dispersion; SAW devices; angular spectrum of waves model; compressed signal sidelobes leve; diffraction effect; dispersive delay lines; dispersive transducer; expander characteristic; iterative synthesis technique; periodical transducer; pulse-compression filters; pulse-expansion filters; Acoustic diffraction; Acoustic transducers; Anisotropic magnetoresistance; Apertures; Chirp modulation; Delay lines; Dispersion; Electromagnetic diffraction; Electromagnetic propagation; Surface acoustic waves;
Conference_Titel :
Frequency and Time Forum, 1999 and the IEEE International Frequency Control Symposium, 1999., Proceedings of the 1999 Joint Meeting of the European
Conference_Location :
Besancon
Print_ISBN :
0-7803-5400-1
DOI :
10.1109/FREQ.1999.841449
