Delay line incorporating a surface acoustic wave ladder filter a

Details Delay line incorporating a surface acoustic wave ladder filter a Delay line incorporating a surface acoustic wave ladder filter a

1999-01-11

2000-02-15

Pascal, Robert

Wave transmission lines and networks

Coupling networks

Delay lines including elastic surface wave propagation means

333153, 330174, H03H 942

Patent

active

060257628

ABSTRACT:
A method (100) of providing a time delay to a signal utilizing a surface acoustic wave ladder filter includes a first step (102) of providing a piezoelectric substrate. A second step (104) includes disposing series and shunt coupled surface acoustic wave transducers in a ladder configuration on the substrate with each of the transducers having an associated aperture and an associated number of interdigital electrode elements. A third step (106) includes configuring the associated aperture and an associated number of interdigital electrode elements for each surface acoustic wave transducer for maximum phase linearity of the ladder filter and uniform group delay response from the ladder filter. A fourth step (108) includes adjusting the number of transducers in the ladder filter to provide a desired average group delay. Subsequently passing a signal through the ladder filter will delay the signal by a time equal to the group delay.

REFERENCES:
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patent: 4635007 (1987-01-01), Magill
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patent: 5874866 (1999-02-01), Satoh et al.
"Design of Surface Acoustic Wave Delay Lines With Interdigital Transducers", Smith et al., IEEE Transactions on Microwave Theory & Techniques, vol. MTT-17, No. 11, pp. 865-873, Nov. 1969.

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