GB1319946A - Piezoelectric filters - Google Patents
Piezoelectric filtersInfo
- Publication number
- GB1319946A GB1319946A GB1178171A GB1178171A GB1319946A GB 1319946 A GB1319946 A GB 1319946A GB 1178171 A GB1178171 A GB 1178171A GB 1178171 A GB1178171 A GB 1178171A GB 1319946 A GB1319946 A GB 1319946A
- Authority
- GB
- United Kingdom
- Prior art keywords
- electrodes
- input
- attenuation poles
- output
- april
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/46—Filters
- H03H9/64—Filters using surface acoustic waves
- H03H9/6489—Compensation of undesirable effects
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/02—Details
- H03H9/02535—Details of surface acoustic wave devices
- H03H9/02614—Treatment of substrates, e.g. curved, spherical, cylindrical substrates ensuring closed round-about circuits for the acoustical waves
- H03H9/02622—Treatment of substrates, e.g. curved, spherical, cylindrical substrates ensuring closed round-about circuits for the acoustical waves of the surface, including back surface
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/02—Details
- H03H9/02535—Details of surface acoustic wave devices
- H03H9/02818—Means for compensation or elimination of undesirable effects
- H03H9/02842—Means for compensation or elimination of undesirable effects of reflections
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/02—Details
- H03H9/125—Driving means, e.g. electrodes, coils
- H03H9/145—Driving means, e.g. electrodes, coils for networks using surface acoustic waves
- H03H9/14544—Transducers of particular shape or position
- H03H9/1455—Transducers of particular shape or position constituted of N parallel or series transducers
Landscapes
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Surface Acoustic Wave Elements And Circuit Networks Thereof (AREA)
Abstract
1319946 Acoustic surface wave filter SIEMENS AG 28 April 1971 [29 April 1970] 11781/71 Heading H3U To increase the selectivity of a filter comprising interdigitated electrodes 20, 21; 30, 31, Fig. 5, 2-4, 6, 7, Fig. 4, mounted upon a quadrilateral piezoelectric ceramic substrate polarized parallel to its thickness, attenuation poles are provided on either side of the pass band. Provision of attenuation poles. (i) Silvered areas (5), Fig. 3 (not shown), each about half the area of its associated electrode may be provided opposite each of input and output sets of electrodes, Fig. 2 (not shown). (ii) Sets 2, 4, 6, 7, Fig. 4, of input electrodes may be spaced to provide attenuation poles when for example d 2 -d 1 = (n + ¢)#p where #p is the mechanical wavelength at the attenuation pole frequency, 3 being the output electrodes. The input may be fed to terminals 20 and 22. (iii) The input and output electrodes 20, 31 whose potentials are in anti-phase during filter operation, may be coupled electrically via a series circuit of a resistor R and capacitor C, Fig. 5, which may be discrete components, or the resistor may be a thick film and the capacitor a set of interdigitated coplanar electrodes, both being formed on the substrate.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19702021124 DE2021124C3 (en) | 1970-04-29 | Piezoelectric filter based on the surface wave principle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1319946A true GB1319946A (en) | 1973-06-13 |
Family
ID=5769849
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1178171A Expired GB1319946A (en) | 1970-04-29 | 1971-04-28 | Piezoelectric filters |
Country Status (4)
| Country | Link |
|---|---|
| AT (3) | AT308202B (en) |
| FR (1) | FR2090687A5 (en) |
| GB (1) | GB1319946A (en) |
| NL (1) | NL7105921A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016169665A1 (en) * | 2015-04-22 | 2016-10-27 | Epcos Ag | Electroacoustic component with improved acoustic properties |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2454223B1 (en) * | 1979-04-10 | 1986-11-28 | Telediffusion Fse | SURFACE ELASTIC WAVE DEVICE FOR INTERFERENCE OR INTERFERENCE CIRCUIT FOR TELEVISION BROADCASTS |
| US4609891A (en) * | 1985-10-16 | 1986-09-02 | Sperry Corporation | Staggered SAW resonator for differential detection |
-
1971
- 1971-03-23 AT AT249771A patent/AT308202B/en not_active IP Right Cessation
- 1971-03-23 AT AT348772A patent/AT320744B/en not_active IP Right Cessation
- 1971-03-23 AT AT348672A patent/AT321367B/en not_active IP Right Cessation
- 1971-04-26 FR FR7114699A patent/FR2090687A5/fr not_active Expired
- 1971-04-28 GB GB1178171A patent/GB1319946A/en not_active Expired
- 1971-04-29 NL NL7105921A patent/NL7105921A/xx unknown
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016169665A1 (en) * | 2015-04-22 | 2016-10-27 | Epcos Ag | Electroacoustic component with improved acoustic properties |
Also Published As
| Publication number | Publication date |
|---|---|
| NL7105921A (en) | 1971-11-02 |
| DE2021124A1 (en) | 1971-11-11 |
| DE2021124B2 (en) | 1975-07-31 |
| AT308202B (en) | 1973-06-25 |
| FR2090687A5 (en) | 1972-01-14 |
| AT320744B (en) | 1975-02-25 |
| AT321367B (en) | 1975-03-25 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PLNP | Patent lapsed through nonpayment of renewal fees |