Surface acoustic wave devices for high temperature applications
First Claim
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1. A Surface Acoustic Wave (SAW) device comprising:
- a substrate formed from a material selected from the group of the LGX family of crystals and gallium phosphate, the substrate having a SAW propagation surface;
a first interdigital transducer formed upon said substrate propagation surface with electrodes formed from an electrically conductive material having a high melting temperature, said first transducer operative upon excitation by an oscillator to launch surface acoustic waves across said propagation surface;
a second interdigital transducer formed upon said substrate propagation surface spaced apart from said first interdigital transducer, said second transducer having electrodes formed upon said propagation surface from an electrically conductive material having a high melting temperature, said second transducer operative to detect said surface acoustic waves; and
an adhesive layer formed from a zirconium material that does not migrate into said interdigital transducers, said adhesive layer disposed between said substrate and said first and second interdigital transducers.
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Abstract
A Surface Acoustic Wave device including a resonator or a delay line formed from an electrically conductive material having a high melting temperature disposed upon the surface of a substrate formed from one of the LGX family of crystals or gallium phosphate. The Surface Acoustic Wave Device is operative as a sensor at high temperatures.
52 Citations
17 Claims
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1. A Surface Acoustic Wave (SAW) device comprising:
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a substrate formed from a material selected from the group of the LGX family of crystals and gallium phosphate, the substrate having a SAW propagation surface; a first interdigital transducer formed upon said substrate propagation surface with electrodes formed from an electrically conductive material having a high melting temperature, said first transducer operative upon excitation by an oscillator to launch surface acoustic waves across said propagation surface; a second interdigital transducer formed upon said substrate propagation surface spaced apart from said first interdigital transducer, said second transducer having electrodes formed upon said propagation surface from an electrically conductive material having a high melting temperature, said second transducer operative to detect said surface acoustic waves; and an adhesive layer formed from a zirconium material that does not migrate into said interdigital transducers, said adhesive layer disposed between said substrate and said first and second interdigital transducers. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A Surface Acoustic Wave (SAW) device comprising:
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a substrate formed from a material selected from one of the group of the LGX family of crystals and gallium phosphate, the substrate having a SAW propagation surface; a single interdigital transducer formed upon said substrate propagation surface with electrodes formed from an electrically conductive material having a high melting temperature, said first transducer operative upon excitation by an oscillator to launch surface acoustic waves across said propagation surface; at least one set of reflecting electrodes formed upon said substrate propagation surface between said interdigital transducer and an end of said substrate, said reflecting electrodes formed from an electrically conductive material having a high melting temperature, said reflecting electrodes co-operating with said interdigital transducer to form a resonator; and an adhesive layer formed from a zirconium material that does not migrate into said interdigital transducer and said at least one set of reflecting electrodes, said adhesive layer disposed between said substrate and said interdigital transducer and between said substrate and said at least one set of reflecting electrodes. - View Dependent Claims (15, 16, 17)
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Specification