Wave transmission lines and networks – Coupling networks – Delay lines including elastic surface wave propagation means
Patent
1978-03-07
1980-02-12
Smith, Alfred E.
Wave transmission lines and networks
Coupling networks
Delay lines including elastic surface wave propagation means
310313, 310326, 333194, H03H 926, H03H 930, H03H 932, H01L 4104
Patent
active
041885961
ABSTRACT:
An elastic surface wave device for use as an electronic element such as a delay line or a filter in home-use electronic apparatus such as color television receivers and radio receivers and in industrial electronic apparatus such as electrical communication units. In the elastic surface wave device which comprises a substrate of piezo-electric material, an electro-mechanical input transducer converting an electrical input signal into an elastic surface wave, and a mechano-electrical output transducer disposed opposite to the input transducer through an elastic surface wave propagation path for converting the propagating elastic surface wave into the electrical signal again, at least two kinds of ultrasonic wave absorbing materials having different absorption coefficients for absorbing an unnecessary elastic surface wave portion are disposed in closely adjacent relation on the substrate surface in the region along the advancing direction of the unnecessary elastic surface wave portion between the opposite ends of the substrate, except the active region including the transducers and the propagation path, thereby improving the effect of unnecessary wave absorption.
REFERENCES:
patent: 3872331 (1975-03-01), Falco
patent: 4096455 (1978-06-01), Drummond
Hitachi , Ltd.
Nussbaum Marvin
Smith Alfred E.
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