Surface acoustic wave resonator filter apparatus

Details Surface acoustic wave resonator filter apparatus Surface acoustic wave resonator filter apparatus

1996-12-27

1998-10-06

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310313B, 310313D, 333186, 333187, H01L 4104, H03H 900

Patent

active

058181466

ABSTRACT:
A SAW resonator filter apparatus includes attenuation characteristics which are steep in a frequency region from a pass band to a higher-frequency stop band without experiencing an increase in insertion losses and enlargement of the apparatus. First, second and third SAW resonator filters are disposed on a piezoelectric substrate and are connected in a cascade arrangement to each other. The first and third SAW resonator filters have interdigital electrodes formed of solid electrode fingers, while the second SAW resonator filter disposed between the first and third filters has interdigital electrodes formed of split electrode fingers. With this construction, the steep attenuation characteristics of the response in a higher frequency range appearing in the frequency characteristics of the second SAW resonator filter can be combined with the attenuation characteristics from the pass band to a higher-frequency stop band of the first and third SAW resonator filters. This enables the attenuation characteristics of the pass band in a higher frequency range to become steeper.

REFERENCES:
patent: 4166257 (1979-08-01), Subramanian
patent: 4307356 (1981-12-01), Arai
patent: 5223762 (1993-06-01), Masaie et al.
patent: 5521453 (1996-05-01), Yatsuda
patent: 5521565 (1996-05-01), Anemogiannis
patent: 5528206 (1996-06-01), Watanabe
patent: 5717367 (1998-02-01), Murai

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