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US 4,516,094 AGranted
Acoustic surface wave device
AssigneeGTE Laboratories Incorporated
InventorChing W. Lee
Life of this patent
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Abstract
An acoustic surface wave device having a pair of attenuating transducers positioned between the input transducer and the output transducer. Each attenuating transducer has two sets of interleaved electrodes which are connected together by a thin film resistor. The attenuating transducers are spaced apart so that their reflected signals are 180.degree. out of phase, and thus tend to cancel each other. The attenuating transducer arrangement increases the insertion loss of the device and consequently suppresses triple transit signals in the device.
Claims8
An acoustic surface wave device comprising
- an acoustic surface wave propagating medium;
- an input transducer for launching acoustic surface waves along a propagation path in said medium, the input transducer comprising two sets of interleaved electrodes disposed on the surface of the acoustic surface wave propagating medium with the electrodes extending transversely to the propagation path;
- an output transducer across said propagation path for receiving and detecting acoustic surface waves propagated along the propagation path from the input transducer, the output transducer comprising two sets of interleaved electrodes disposed on the surface of the acoustic surface wave propagating medium with the electrodes extending transversely to the propagation path;
- a first attenuating transducer interposed across said propagation path between the input transducer and the output transducer for intercepting and attenuating acoustic surface waves propagated along said propagation path;
- and
- a second attenuating transducer interposed across said propagation path between the input transducer and the output transducer for intercepting and attenuating acoustic surface waves propagated along said propagation path;
- said first attenuating transducer and said second attenuating transducer being spaced apart by a distance so as to reflect acoustic surface waves along said propagation path 180.degree. out of phase at the synchronous frequency of the device.
4 more elements
Dependencies are inferred from the claim text.