Filterbank using surface acoustic wave technology

Details Filterbank using surface acoustic wave technology Filterbank using surface acoustic wave technology

1993-01-26

1994-07-26

Lee, Benny

Wave transmission lines and networks

Coupling networks

Electromechanical filter

333196, 333133, H03H 964

Patent

active

053329830

ABSTRACT:
A filterbank using surface acoustic wave technology and having a plurality of filters. Each filter has an input transducer and an output transducer. The input transducers are connected in parallel to a single matching circuit. The output transducers each have a separate matching circuit. The transducers are formed by a thin film of aluminum pattern on a piezoelectric substrate. The input transducers all have the same structure and the output transducers all have the same structure, though that structure is different from the input transducers. The only difference between the transducers of each filter is the location of electrode breaks for each electrode. A weighting function of the transducers is scaled and biased to provide a constant impedance across the bandwidth of the filterbank and to equalize the output amplitudes and capacitances of the output transducers. This produces a continuous level response across the bandwidth of the filterbank. Previously, while a continuous level response was theoretically achievable, it cannot be achieved in practice.

REFERENCES:
patent: 3942140 (1976-03-01), Laker et al.
patent: 4321567 (1982-03-01), Sandy
patent: 4734664 (1988-03-01), Hikita et al.
patent: 4745378 (1988-05-01), Niitsuma et al.
patent: 4803449 (1989-02-01), Hikita et al.

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