Electrical generator or motor structure – Educational or construction units or kits
Patent
1975-05-21
1977-04-05
Budd, Mark O.
Electrical generator or motor structure
Educational or construction units or kits
310 98, H01L 4104
Patent
active
040164403
ABSTRACT:
This disclosure concerns a particularly oriented plate-like monocrystalline piezoelectric body of lithium niobate for use as a substrate in an acoustic surface wave filter device, wherein the orientation of the piezoelectric body of lithium niobate is responsible for a substantial reduction in spurious responses including plate modes. More specifically, the piezoelectric body comprises a plate of lithium niobate having a crystalline lattice orientation as determined by a 46.degree. (ZYW) cut. It has been determined that such a piezoelectric body may be employed as a substrate in an acoustic surface wave filter device to effect an improved filter response in that unwanted spurious responses including those caused by plate modes are removed or substantially reduced from the acoustic signals prior to their conversion into electrical output signals.
REFERENCES:
patent: 3601639 (1971-08-01), Hannon et al.
patent: 3906410 (1975-09-01), Williams
Ultrasonic Transducers by Deklerk, Ultrasonics, Jan. 1971, pp. 35-48.
Applied Physics Letters, vol. 18, No. 9, May 1, 1971, pp. 393-394.
Budd Mark O.
Comfort James T.
Hiller William E.
Levine Harold
Texas Instruments Incorporated
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