GB561088A - Improvements in or relating to wave transmission networks - Google Patents
Improvements in or relating to wave transmission networksInfo
- Publication number
- GB561088A GB561088A GB15057/42A GB1505742A GB561088A GB 561088 A GB561088 A GB 561088A GB 15057/42 A GB15057/42 A GB 15057/42A GB 1505742 A GB1505742 A GB 1505742A GB 561088 A GB561088 A GB 561088A
- Authority
- GB
- United Kingdom
- Prior art keywords
- band
- frequency
- rod
- length
- natural
- 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
Landscapes
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Crystals, And After-Treatments Of Crystals (AREA)
- Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
- Surface Acoustic Wave Elements And Circuit Networks Thereof (AREA)
Abstract
561,088. Impedance networks. WESTERN ELECTRIC CO., Inc. Oct. 27,1942, No. 15057. Convention date, Nov. 25, 1941. [Class 40 (iii)] An electro-mechanical band filter comprises a rod 6 set into longitudinal vibration (e.g. by piezo-electric means 15, 16) and one or more cross-bars 7, 8 having a natural flexural frequency of vibration near a limit of the band. The rod may have a length equal to a half wavelength at the upper or lower frequency limit of the band, and each half of a single cross-bar may have its natural frequency near the lower or upper end of the band respectively. Or the rod may have a length equal to a half wavelength at the mid-band frequency and the two cross-bars 7, 8 may have their natural frequencies near the upper and lower limits respectively. The vibrations of the rod may be produced and picked-up by piezo-electric means 15, 16 having a length h equal to a halfwave-length at a frequency within the band and supported at 18, 19 at a node of motion. Capacity and inductance C, L provide the desired electrical image impedance. The band of frequencies transmitted by the crystal is the same as that transmitted by the filter proper. Specification 535,507 is referred to.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US420360A US2345491A (en) | 1941-11-25 | 1941-11-25 | Wave transmission network |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB561088A true GB561088A (en) | 1944-05-04 |
Family
ID=23666142
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB15057/42A Expired GB561088A (en) | 1941-11-25 | 1942-10-27 | Improvements in or relating to wave transmission networks |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US2345491A (en) |
| GB (1) | GB561088A (en) |
Families Citing this family (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2443471A (en) * | 1945-03-29 | 1948-06-15 | Bell Telephone Labor Inc | Piezoelectric damping means for mechanical vibrations |
| US2596460A (en) * | 1946-04-05 | 1952-05-13 | Us Navy | Multichannel filter |
| US2683810A (en) * | 1949-03-30 | 1954-07-13 | Marconi Wireless Telegraph Co | Piezoelectric crystal oscillator |
| US2711515A (en) * | 1950-09-29 | 1955-06-21 | Bell Telephone Labor Inc | Delay line |
| US2738467A (en) * | 1953-03-12 | 1956-03-13 | Rca Corp | Mechanical resonator coupling utilizing poisson's effect |
| US2799832A (en) * | 1953-09-11 | 1957-07-16 | Motoroln Inc | Electromechanical filter |
| US3015789A (en) * | 1956-04-23 | 1962-01-02 | Toyotsushinki Kabushiki Kaisha | Mechanical filter |
| US3185943A (en) * | 1956-04-23 | 1965-05-25 | Toyotsushinki Kabushiki Kaisha | One-piece mechanical filter having portions forming plural resonators and coupling means |
| DE1112214B (en) * | 1957-01-12 | 1961-08-03 | Telefunken Patent | Mechanical filter with damping poles at finite frequencies |
| DE1100834B (en) * | 1957-04-06 | 1961-03-02 | Telefunken Gmbh | Mechanical frequency filter |
| US2948867A (en) * | 1958-11-17 | 1960-08-09 | Oskar E Mattiat | Piezoelectric ceramic resonators |
| US3020482A (en) * | 1959-07-13 | 1962-02-06 | Gen Electric | Synchronization network |
| NL261600A (en) * | 1960-02-26 | |||
| US3131368A (en) * | 1960-09-14 | 1964-04-28 | Robert W Hart | Signal selecting apparatus |
| GB1122245A (en) * | 1966-04-22 | 1968-07-31 | Marconi Co Ltd | Improvements in or relating to electro-mechanical resonators |
| US3573672A (en) * | 1968-10-30 | 1971-04-06 | Bell Telephone Labor Inc | Crystal filter |
| US3517350A (en) * | 1969-07-07 | 1970-06-23 | Bell Telephone Labor Inc | Energy translating device |
| JPS58119217A (en) * | 1982-01-07 | 1983-07-15 | Murata Mfg Co Ltd | Piezoelectric tuning fork |
-
1941
- 1941-11-25 US US420360A patent/US2345491A/en not_active Expired - Lifetime
-
1942
- 1942-10-27 GB GB15057/42A patent/GB561088A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| US2345491A (en) | 1944-03-28 |
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