Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1987-02-19
1989-09-26
Laroche, Eugene R.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310313C, 310313D, 333151, 333154, H03H 900, H03H 942
Patent
active
048703125
ABSTRACT:
A surface wave acoustic delay line is formed of a set of electrode assemblies disposed on the surface of a block of crystalline material propagative of a surface acoustic wave. In each of the assemblies, the electrodes are arranged in an interdigitated pattern. Reflected waves are cancelled by the construction of an additional electrode in each of an electrode assembly, the additional electrode extending only one-half the distance of the other electrodes and being spaced from an adjacent electrode by one-quarter wavelength. This introduces a 180.degree. phase shift between portions of relected waves which then cancel to remove the reflection. Also, in the case of closely spaced electrode assemblies, additional electrodes, equal in shape and size to the electrodes of the assemblies, are introduced between the assemblies in the form of a grid which propagates surface waves without reflection.
REFERENCES:
patent: 4146851 (1979-03-01), Dempsey et al.
patent: 4201964 (1980-05-01), Noro et al.
patent: 4205280 (1980-05-01), Gilchrist et al.
patent: 4333065 (1982-06-01), DeVries
patent: 4365219 (1982-12-01), Nathan
patent: 4406964 (1983-09-01), Chiba et al.
patent: 4420728 (1983-12-01), Bower
patent: 4516094 (1985-05-01), Lee
patent: 4535265 (1985-08-01), Kodama et al.
patent: 4604623 (1986-05-01), Skeie
patent: 4642506 (1987-02-01), Lewis
patent: 4642507 (1987-02-01), Suthers et al.
La Rosa Richard
Marynowski Thomas J.
Hazeltine Corporation
LaRoche Eugene R.
Lee Benny
Onders Edward A.
LandOfFree
Surface wave device having anti-reflective shield does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Surface wave device having anti-reflective shield, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Surface wave device having anti-reflective shield will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-189270