Claims
- 1. A surface acoustic wave delay line for adjusting the time delay or insertion phase of propagating surface acoustic wave energy, comprising:
- a substrate of piezoelectric material having a surface capable of propagating surface acoustic wave energy;
- input means including an input transducer disposed on said substrate for launching surface acoustic wave energy along said surface in response to an electrical input signal;
- output means including an output transducer disposed on said substrate in the path of said propagating energy for detecting said energy incident thereon and producing an electrical output signal; and
- time delay or phase compensation means disposed on said substrate in the path of said propagating energy between said transducers, said means including a group of spaced conductive electrodes initially conductively interconnected outside said path of said propagating energy, at least one of said electrodes being electrically insulated from the remainder of said group of electrodes.
- 2. The delay line according to claim 1, wherein said electrodes are periodically spaced.
- 3. The delay line according to claim 1, wherein said electrodes are non-periodically spaced.
- 4. The delay line according to claim 1, wherein said electrodes are approximately orthogonally oriented with respect to the direction of said propagating energy.
- 5. The delay line according to claim 1, wherein said electrodes are initially conductively interconnected by a conductive summing bar disposed at one end of said electrodes.
- 6. The delay line according to claim 1, wherein said electrodes are initially conductively interconnected by a conductive summing bar disposed at each end of said electrodes.
- 7. In a surface acoustic wave delay line including spaced input and output transducers disposed on a propagating surface of a piezoelectric substrate, the improvement comprising time delay or phase compensation means disposed on the substrate of piezoelectric material in the path of surface acoustic wave energy propagating between the input and output transducers, the means including a group of spaced conductive electrodes initially conductively interconnected outside the path of the propagating energy, at least one of said electrodes being electrically insulated from the remainder of the conductively interconnected group of said electrodes.
- 8. A method of manufacturing a surface acoustic wave delay line on a piezoelectric substrate comprising the steps of depositing spaced interdigital input and output transducers defining a propagating path therebetween and a group of spaced conductive electrodes conductively interconnected outside said path, and selectively severing at least one of said conductively interconnected conductive electrodes outside said path to provide a desired characteristic related to time delay or phase.
Government Interests
The invention herein described was made in the course of or under a contract with the United States Navy.
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
3845420 |
Holland et al. |
Oct 1974 |
|
3882429 |
Martin |
May 1975 |
|
Non-Patent Literature Citations (1)
Entry |
Fink -"Television Engineering Handbook," McGraw-Hill New York, 1957; p. 15. |