Matched filter with improved synchronous characteristics, and re

Details Matched filter with improved synchronous characteristics, and re Matched filter with improved synchronous characteristics, and re

1996-07-23

1998-09-29

Pascal, Robert J.

Wave transmission lines and networks

Coupling networks

Electromechanical filter

333194, 333195, 333196, 310313B, 364821, 375343, H03H 964, H04B 169

Patent

active

058150552

ABSTRACT:
A matched filter has an input IDT and an output IDT, and also has a device for preventing propagating surface acoustic waves from diverging. By preventing the divergence of surface acoustic waves, signals obtained in units of electrode finger pairs of the output IDT are uniformed. Furthermore, this application also discloses the following arrangement. That is, an arrangement for converging surface acoustic waves is adopted, and the width of surface acoustic waves input to the output IDT is set to be larger than at least the crossing width of electrode fingers, nearest to the input IDT, of those of the output IDT, so that some surface acoustic waves propagate along non-crossing portions of the electrode fingers, on the input IDT side, of those of the output IDT. With this arrangement, the influence of the crossing portions of the electrode fingers, closer to the input IDT, on the surface acoustic waves input to the crossing portions of the electrode fingers, farther from the input IDT, can be relaxed.

REFERENCES:
patent: 3654574 (1972-04-01), Dias
patent: 3697899 (1972-10-01), Dias
patent: 3825860 (1974-07-01), Carr
patent: 4506239 (1985-03-01), Cho et al.
patent: 5477098 (1995-12-01), Eguchi et al.
patent: 5539687 (1996-07-01), Torisawa et al.
"SAW MSK Matched Filter and Its Application", Electronics & Communications in Japan, Part II, vol. 68, No. 12, Dec. 1985, pp. 52-62.

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