Surface acoustic wave unidirectional transducer having floating

Details Surface acoustic wave unidirectional transducer having floating Surface acoustic wave unidirectional transducer having floating

1993-05-21

1994-04-26

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310313B, 333151, 333154, H01L 4108

Patent

active

053069781

ABSTRACT:
In a surface acoustic wave transducer including a substrate made of a piezoelectric material, an input side IDT structure having positive and negative electrodes arranged in an interdigit manner and floating electrodes arranged between successive positive and negative electrodes, and an output side IDT structure having positive and negative electrodes arranged in an interdigit manner and floating electrodes arranged between successive positive and negative electrodes, the electrodes of the input and output side IDT structures are arranged such that a surface acoustic wave propagates in one direction, distances between corresponding tracks in the input and output side IDT structures are linearly changed and lengths of these tracks are changed in accordance with a predetermined window function.

REFERENCES:
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IEEE Ultrasonics Symposium Proc.; Oct. 2-5, 1988 Chicago, US; (pp. 57-61); Takeuchi; "Field Analysis of Saw Single-Phase Unidirectional Transducers Using Internal Floating Electrodes".
Electronics Letters, vol. 20, No. 24, Nov. 22, 1984, Enage, GB; (pp. 989-990) Yamanouchi "New Low-Loss Saw Filter Using Internal Floating Electrode Reflection Types of Single-Phase Unidirectional Transducer".
Electronics and Communications in Japan, vol. 62, No. 2, Feb. 1979, New York, US; (pp. 10-17); Kouji Hohkawa et al. "Surface Acoustic Wave Filters Without Apodization Loss".
"High Performance with High Frequency Acoustic Surface Wave Devices", Yamanouchi, 1991, pp. 36-37.
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Research Institute of Electrical Communication, Tohoku University, "A Field Analysis of Saw Single-Phase Unidirectional Transducers Using Internal Floating Electrodes", Takeuchi et al., pp. 17-22.
Research Institute of Electrical Communication, Tohoku University, "Unidirectional Response of Inerdigital Transducers on LiNbO.sub.3 Substrate" Suzuki et al., pp. 201-205.
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Electronics Letters, "New Low-Loss Saw Filter Using Internal Floating Electrode Reflection Types of Single-Phase Unidirectional Transducer", Yamanouchi et al., Oct. 1984, pp. 989-990.
Electronics Letters, "Low-Loss Saw Filter Using Internal Reflection Types of Single-Phase Unidirectional Transducer", Yamanouchi et al., Aug. 1984, pp. 819-821.
Research Institute of Electrical Communication, Tohoku University, "Low-Loss Saw Filter Using Internal Reflection Types of New Single-Phase Unidirectional Transducer", Yamanouchi et al., 1984 Ultrasonics Symposium, pp. 68-71.
Research Institute of Electrical Communication, Tohoku University, "Acoustic Surface Ways Filters Using New Distance Weighting Techniques", Yamanouchi et al., 1980 Ultrasonics Symposium, pp. 313-316.
"Fundamental of Microwave Circuit and its Application", Aug. 1990, Y. Konishi, pp. 280-285.
"Technical Handbook of Acoustic Wave Elements", Nov. 1991, Y. Yamanouchi, pp. 192-195.

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