Acoustic surface wave device wherein acoustic surface waves may be propagated with an electric field dependent velocity
阅读：369发布：2022-03-10
专利汇可以提供Acoustic surface wave device wherein acoustic surface waves may be propagated with an electric field dependent velocity专利检索，专利查询，专利分析的服务。并且An acoustic wave device relies on its effectiveness not on the piezoelectric effect but on the elastic stiffness effect and the electro-elastic stiffness effect whereby the effectiveness of the device is electric field dependent.，下面是Acoustic surface wave device wherein acoustic surface waves may be propagated with an electric field dependent velocity专利的具体信息内容。
1. An acoustic surface wave device comprising a body of material which has, belonging to its electro-eLastic stiffness tensors, at least one tensor element of sufficient magnitude to allow the velocity of an acoustic surface wave traveling in a first given direction to be varied significantly in response to variation of an electric field applied in a second given direction across the body of material, means for launching an acoustic surface wave in the first given direction in the surface of the body of material, and means for applying an electric field in the second given direction across the body of material.
2. An acoustic surface wave device as claimed in claim 1, including a substrate of material different from said material of said body, said body of material being in the form of a layer on said substrate.
3. An acoustic surface wave device as claimed in claim 2 in which the thickness of said layer is less than the wavelength in said body of material of an acoustic surface wave, said substrate being made of material which is physically capable of supporting an acoustic surface wave.
4. An acoustic surface wave device as claimed in claim 1 wherein said means for applying an electric field comprises at least one pair of interdigital comb electrodes so arranged that said field may be applied in the region of said comb electrodes.
5. An acoustic surface wave device as claimed in claim 1 wherein said means for applying an electric field includes at least one extended electrode distributed over said body of material in at least one dimension, and means for applying different electric fields across parts of said body having different parts of said extended electrode on it whereby the velocity of acoustic surface waves differs at different parts of said extended electrode.
6. An acoustic surface wave device as claimed in claim 1 wherein said means for applying an electric field is arranged so that said second given direction, in which said electric field is applied, is parallel to said first given direction in which an acoustic surface wave travels.
7. An acoustic surface wave device as claimed in claim 1 wherein said means for applying an electric field is arranged so that said second given direction, in which said electric field is applied, is perpendicular to said first given direction in which an acoustic surface wave travels.
8. An acoustic surface wave device which relies for its effectiveness on the electrostrictive effect rather than on the piezoelectric effect whereby the effectiveness of the device is electric field dependent, said device comprising a body of material which has electrostrictive constants and piezoelectric constants such that for an acoustic surface wave traveling in a first given direction in said body and an electric field applied across said body in a second given direction the piezoelectric effect is ngligible but the electrostrictive effect is significant, and means somprising a multiple acoustic surface wave reflector for modifying the velocity of an acoustic surface wave traveling in said body in said first given direction, said velocity modifying means including means for applying an electric field in the region of said reflector across said body of material in said second given direction.
9. An acoustic surface wave device which relies for its effectiveness on the electrostrictive effect rather than on the piezoelectric effect whereby the effectiveness of the device is electric field dependent, said device comprising a body of material which has electrostrictive constants and piezoelectric constants such that for an acoustic surface wave traveling in a first given direction in said body and an electric field applied across said body in a second given direction the piezoelectric effect is negligible but the electrostrictive effect is significant, and means for modifying the velocity of an acoustic surface wave traveling in said body in said first given direction, said velocity modifying means including means for applying an electric field across said body of material in said second given direction, said modifying means Comprising a phase shifter which includes two electrodes so deposited on said body as to cause a phase shift in an acoustic surface wave traveling in the proximity of one of said electrodes, at least one of said electrodes being so shaped as to give different phase shifts to acoustic surface waves in different parts of said body of material in order to control the wavefront of the acoustic surface waves.
10. An acoustic surface wave device as claimed in claim 9 wherein said two electrodes are so deposited on said body of material as to constitute an acoustic surface wave waveguide.
11. An acoustic surface wave device as claimed in claim 10 further including a steering electrode so deposited on said body of material that altering the voltage applied to said steering electrode will cause acoustic surface wave steering, and means for controllably altering the voltage applied to said steering electrode.
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