Saw channelized filters

Details Saw channelized filters Saw channelized filters

1988-02-04

1990-08-07

Tarcza, Thomas H.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

333154, 310313B, 310313C, H01L 4104

Patent

active

049470736

ABSTRACT:
A surface acoustic wave (SAW) device and a related method, for providing improved frequency response characteristics from a SAW spectrum analyzer or channelizer. The device includes a spectrum analyzer with a preprocessing SAW device configured to provide output signals with narrower passbands, lower sidelobe components, or both. The preprocessing SAW device is a tapped delay line in one embodiment, to simulate positional offsets in the placement of input transducers of the analyzer. The tapped delay line can also be used to provide amplitude weighting or can be configured in a chirp spacing, to transform the spectrum analyzer into a chirp analyzer. Another embodiment employs a thinned-electrode prefilter as the preprocessing device, to yield a frequency response with multiple narrow passbands, which are used to narrow the individual channel passbands of the spectrum analyzer or to suppress sidelobes in the frequency response.

REFERENCES:
patent: 3755761 (1973-08-01), Hartmann
patent: 3803395 (1974-04-01), Quate
patent: 3919669 (1975-11-01), Hartemann
patent: 4499393 (1985-02-01), Stokes et al.
patent: 4506239 (1985-03-01), Cho et al.
patent: 4697115 (1987-04-01), Mitsutsuka

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