Piezoelectric filter having resonators formed between adjacent interference locations
阅读：530发布：2024-02-19
专利汇可以提供Piezoelectric filter having resonators formed between adjacent interference locations专利检索，专利查询，专利分析的服务。并且An electromechanical device operating on the surface-wave principle as a transducer of a filter comprises a substrate carrying a plurality of electrodes. The substrate may include a piezoelectric material and have interference locations defining resonant circuits. The interference locations may include a broken line of laser produced spots, a protuberance or a groove extending perpendicular to the direction of wave propagation.，下面是Piezoelectric filter having resonators formed between adjacent interference locations专利的具体信息内容。
1. An electromechanical device comprising: a body including at least a portion thereof of piezoelectric material, electrodes carried on said body to convert electromagnetic oscillations into acoustic surface oscillations, a surface of said body having interference locations for surface waves, which interference locations extend substantially perpendicular to the direction of wave propagation and have dimensions in said direction which are small compared with the wavelength of the surface wave, and a resonator being formed by each interval between adjacent interference locations in association with the intervening surface sections.
2. An electromechanical device as claimed in claim 1, in which at least one of said interference locations is defined by a trench-like recess extending perpendicular to the direction of wave propagation.
3. An electromagnetic device as claimed in claim 1, wherein at least one of said interference locations extends only over part of the surface of said body.
4. An electromechanical device as claimed in claim 1, comprising at least one additional pair of electrodes carried on said surface and electrically connected to the aforementioned electrodes.
5. An electromechanical device as claimed in claim 1, comprising at least one line section on said body defining a coupling line.
6. An electromechanical device as claimed in claim 1, comprising additional interference locations carried on said surface to trim said device by modifying the effective length between the initially mentioned interference locations.
7. An electromechanical device as claimed in claim 1, operable as a filter and comprising output electrodes carried on said body.
8. An electromechanical device as claimed in claim 1, operable as a filter comprising an input transducer and an output transducer coupled together via said body.
9. An electromechanical device comprising: a body including at least a portion thereof of piezoelectric material, electrodes carried on said body to convert electromagnetic oscillations into acoustic surface oscillations, a surface of said body having interference locations for surface waves, which interference locations extend substantially perpendicular to the direction of wave propagation and have dimensions in said direction which are small compared with the wave length of the surface wave, and a resonator being formed by each interval between adjacent interference locations in association with the intervening surface sections, at least oNe of said interference locations defined by a wall-like protuberance extending perpendicular to the direction of wave propagation.
10. An electromechanical device comprising: a body including at least a portion thereof of piezoelectric material, electrodes carried on said body to convert electromagnetic oscillations into acoustic surface oscillations, a surface of said body having interference locations for surface waves, which interference locations extend substantially perpendicular to the direction of wave propagation and have dimensions in said direction which are small compared with the wave length of the surface wave, and a resonator formed by each interval between adjacent interference locations in association with the intervening surface sections, at least one interference location defined by an interrupted line of detent spots extending perpendicular to the direction of wave propagation.
11. An electromechanical device comprising: a body including at least a portion thereof of piezoelectric material, electrodes carried on said body to convert electromagnetic oscillations into acoustic surface oscillations, a surface of said body having interference locations for surface waves, which interference locations extend substantially perpendicular to the direction of wave propagation and have dimensions in said direction which are small compared with the wave length of the surface wave, and a resonator formed by each interval between adjacent interference locations in association with the intervening surface sections, at least one of said interference locations defined as a recess in and a protuberance from the surface of said body.
12. An electromechanical device comprising: a body including at least a portion thereof of piezoelectric material, electrodes carried on said body to convert electromagnetic oscillations into acoustic surface oscillations, a surface of said body having interference locations for surface waves, which interference locations extending substantially perpendicular to the direction of wave propagation and have dimensions in said direction which are small compared with the wave length of the surface wave, and a resonator being formed by each interval between adjacent interference locations in association with the intervening surface sections, at least two adjacent interference locations connected with one another by at least one protuberance extending in the direction of propagation of the acoustic wave.
13. An electromechanical device as claimed in claim 12, wherein said additional protuberance comprises an interrupted line.
14. An electromechanical device comprising: a body including at least a portion thereof of piezoelectric material, electrodes carried on said body to convert electromagnetic oscillations into acoustic surface oscillations, a surface of said body having interference locations for surface waves, which interference locations extend substantially perpendicular to the direction of wave propagation and have dimensions in said direction which are small compared with the wave length of the surface wave, and a resonator formed by each interval between adjacent interference locations in association with the intervening surface sections, at least two adjacent interference locations connected with one another by at least one recess extending in the direction of propagation of the acoustic wave.
15. An electromechanical device as claimed in claim 14, wherein said additional recess comprises an interrupted line.
16. An electromechanical device comprising: a body including at least a portion thereof of piezoelectric material, electrodes carried on said body to convert electromagnetic oscillations into acoustic surface oscillations, a surface of said body having interference locations for surface waves, which interference locations extend substantially perpendicular to the direction of wave propagation and have dimensions in said direction which are small compared with the wave length of the surface wave, and a resonator forMed by each interval between adjacent interference locations in association with the intervening surface sections, and comprising a plurality of additional pairs of electrodes carried on said surface, said additional pairs of electrodes being interconnected to form by-passes.
17. An electromechanical device as claimed in claim 16, comprising a line connecting different electrode pairs and includes an electrical network in said line to provide additional poles.
18. An electromechanical device operable as a filter comprising: a body including at least a portion thereof of piezoelectric material, electrodes carried on said body to convert electromagnetic oscillations into acoustic surface oscillations, a surface of said body having interference locations for surface waves, which interference locations extend substantially perpendicular to the direction of wave propagation and have dimensions in said direction which are small compared with the wave length of the surface wave, and a resonator formed by each interval between adjacent interference locations in association with the intervening surface sections, means on said surface of said body defining at least two mutually decoupled filter systems having different pass bands, a common input transducer system for exciting said two filter systems, and respective output transducer systems coupled to said input transducer system via said body for said two filter systems to form a divider network.
19. An electromechanical device as claimed in claim 18, wherein said individual resonators are tuned to a resonance frequency in the order of magnitude of 800 KC/s.
20. An electromechanical device as claimed in claim 19, in which said transducer systems are assigned oscillatory circuits comprising lumped circuit elements.
21. An electromechanical device as claimed in claim 19, comprising absorber resistors connected to each of said transducer systems.
22. An electromechanical device as claimed in claim 19, wherein said transducer systems comprise a piezoelectric material that has a lower quality factor than the material used for the intermediate filter body.
23. An electromechanical device operable as a transducer comprising: a body including at least a portion thereof of piezoelectric material, electrodes carried on said body to convert electromagnetic oscillations into acoustic surface oscillations, a surface of said body having interference locations for surface waves, which interference locations extend substantially perpendicular to the direction of wave propagation and have dimensions in said direction which are small compared with the wave length of the surface wave, and a resonator formed by each interval between adjacent interference locations in association with the intervening surface sections, said body including electrostrictive material and a wave sink in the direction opposite to the requisite direction of propagation of the waves.
24. An electromechanical device as claimed in claim 23, wherein said body is terminated at both ends by interference locations for acoustic waves, which form together with the intervening mechanical line section an acoustic resonator for the predetermined operating frequency.
25. An electromechanical device as claimed in claim 23, wherein said interference locations enclose only one transducer element having a length substantially equivalent to half a wavelength.
26. An electromechanical device as claimed in claim 23, wherein said interference locations enclose therebetween several transducer elements each having a length of substantially half a wavelength.
27. An electromechanical device as claimed in claim 23, wherein said external excitation electrodes simultaneously serve as said interference locations.
28. An electromechanical device as claimed in claim 23, in which said interference locations are spaced apart by said transducer elements and by additional line sections.
29. An electromechanical device as claimed in claim 23, wherein said interferenCe locations have mutually equal reflectivities.
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