GB1142427A - Electromechanical filter - Google Patents
Electromechanical filterInfo
- Publication number
- GB1142427A GB1142427A GB4550567A GB4550567A GB1142427A GB 1142427 A GB1142427 A GB 1142427A GB 4550567 A GB4550567 A GB 4550567A GB 4550567 A GB4550567 A GB 4550567A GB 1142427 A GB1142427 A GB 1142427A
- Authority
- GB
- United Kingdom
- Prior art keywords
- frequency
- condition
- subsequent
- width
- fundamental
- 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
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 abstract 1
- 229910052784 alkaline earth metal Inorganic materials 0.000 abstract 1
- 150000001342 alkaline earth metals Chemical class 0.000 abstract 1
- 230000005284 excitation Effects 0.000 abstract 1
- 230000010287 polarization Effects 0.000 abstract 1
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
- H03H9/15—Constructional features of resonators consisting of piezoelectric or electrostrictive material
- H03H9/17—Constructional features of resonators consisting of piezoelectric or electrostrictive material having a single resonator
- H03H9/176—Constructional features of resonators consisting of piezoelectric or electrostrictive material having a single resonator consisting of ceramic material
-
- 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
- H03H9/13—Driving means, e.g. electrodes, coils for networks consisting of piezoelectric or electrostrictive materials
- H03H9/132—Driving means, e.g. electrodes, coils for networks consisting of piezoelectric or electrostrictive materials characterized by a particular shape
Landscapes
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
- Transducers For Ultrasonic Waves (AREA)
Abstract
1,142,427. Electromechanical filters. PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd. 5 Oct., 1967 [8 Oct., 1966], No. 45505/67. Heading H3U. A filter comprises a piezo-electric body in the form of a short cylinder having on its end faces an excitation electrode (shown shaded in the drawing). Ri denotes the inside radius and Ru the outside radius and in accordance with the invention Ri is at least equal to 0À1 Î Ru. Further, the radial width b of at least one electrode either meets the condition that lies between 0À5 and 0À7 or meets the condition b that lies between 0À8 and 0À9. The Ru-Ri above-mentioned factor of at least 0À1 ensures that the fundamental resonant frequency is well spaced from the next resonant frequencies and the latter may thus be easily suppressed by simple electric networks. The first condition above-mentioned determines the width b such that the first resonant frequency subsequent to the fundamental frequency is rigorously suppressed. The second condition above-mentioned determines the width b so as to rigorously suppress the second resonant frequency subsequent to the fundamental frequency and enables the filter to operate at the fundamental frequency and also at the first subsequent frequency. The cylindrical body may be polarized so as to exhibit remanent electric polarization in the axial direction and may consist of a polycrystalline titanate, niobate and/or zirconate of one of the alkaline earth metals.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL6614206A NL6614206A (en) | 1966-10-08 | 1966-10-08 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1142427A true GB1142427A (en) | 1969-02-05 |
Family
ID=19797884
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB4550567A Expired GB1142427A (en) | 1966-10-08 | 1967-10-05 | Electromechanical filter |
Country Status (8)
| Country | Link |
|---|---|
| AT (1) | AT275612B (en) |
| BE (1) | BE704815A (en) |
| CH (1) | CH472150A (en) |
| DE (1) | DE1541953B1 (en) |
| DK (1) | DK118779B (en) |
| GB (1) | GB1142427A (en) |
| NL (1) | NL6614206A (en) |
| NO (1) | NO118801B (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2877432A (en) * | 1957-01-08 | 1959-03-10 | Clevite Corp | Electromechanical filter elements |
-
1966
- 1966-10-08 NL NL6614206A patent/NL6614206A/xx unknown
-
1967
- 1967-10-04 DE DE19671541953 patent/DE1541953B1/en not_active Withdrawn
- 1967-10-05 AT AT903467A patent/AT275612B/en active
- 1967-10-05 CH CH1388267A patent/CH472150A/en not_active IP Right Cessation
- 1967-10-05 DK DK497067A patent/DK118779B/en unknown
- 1967-10-05 GB GB4550567A patent/GB1142427A/en not_active Expired
- 1967-10-05 NO NO17000467A patent/NO118801B/no unknown
- 1967-10-06 BE BE704815D patent/BE704815A/xx unknown
Also Published As
| Publication number | Publication date |
|---|---|
| CH472150A (en) | 1969-04-30 |
| NO118801B (en) | 1970-02-16 |
| BE704815A (en) | 1968-04-08 |
| AT275612B (en) | 1969-10-27 |
| DK118779B (en) | 1970-10-05 |
| DE1541953B1 (en) | 1972-02-03 |
| NL6614206A (en) | 1968-04-09 |
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