GB813852A - Improvements in or relating to band-stop electric wave filters - Google Patents
Improvements in or relating to band-stop electric wave filtersInfo
- Publication number
- GB813852A GB813852A GB1514956A GB1514956A GB813852A GB 813852 A GB813852 A GB 813852A GB 1514956 A GB1514956 A GB 1514956A GB 1514956 A GB1514956 A GB 1514956A GB 813852 A GB813852 A GB 813852A
- Authority
- GB
- United Kingdom
- Prior art keywords
- electric wave
- parallel
- band
- wave filters
- inductance
- 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
- 239000003990 capacitor Substances 0.000 abstract 2
- 239000013078 crystal Substances 0.000 abstract 2
- 238000004804 winding Methods 0.000 abstract 2
- 238000009966 trimming Methods 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/01—Frequency selective two-port networks
- H03H7/17—Structural details of sub-circuits of frequency selective networks
- H03H7/1741—Comprising typical LC combinations, irrespective of presence and location of additional resistors
- H03H7/1775—Parallel LC in shunt or branch path
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/01—Frequency selective two-port networks
- H03H7/0115—Frequency selective two-port networks comprising only inductors and capacitors
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/01—Frequency selective two-port networks
- H03H7/17—Structural details of sub-circuits of frequency selective networks
- H03H7/1708—Comprising bridging elements, i.e. elements in a series path without own reference to ground and spanning branching nodes of another series path
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/01—Frequency selective two-port networks
- H03H7/17—Structural details of sub-circuits of frequency selective networks
- H03H7/1741—Comprising typical LC combinations, irrespective of presence and location of additional resistors
- H03H7/1791—Combined LC in shunt or branch path
-
- 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
- H03H9/54—Filters comprising resonators of piezoelectric or electrostrictive material
- H03H9/542—Filters comprising resonators of piezoelectric or electrostrictive material including passive elements
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
- Filters And Equalizers (AREA)
- Surface Acoustic Wave Elements And Circuit Networks Thereof (AREA)
Abstract
813,852. Electric wave filters. SIEMENS & HALSKE A.G. May 15, 1956 [May 16, 1955], No. 15149/56. Class 40 (8). An electric wave stop band filter particularly for eliminating a small band in the vicinity of the pilot frequency in a carrier telecommunication system, consists of a differential T-network, wherein the stray capacitance of the shunt arm, which includes a piezoelectric crystal, is balanced by a capacitor in parallel with the series arm. The differential T-network illustrated comprises a series inductance coil Lo the mutual inductance M of the two halves of which may be preselected by winding the halves on the two outer sections of a three-section coil former. The shunt arm consists of the primary winding of a transformer in the secondary circuit, of which is a piezoelectric crystal Q and a parallel trimming condenser Tr. A capacitor Ck is connected in parallel with the inductance Lo to balance the stray capacitance of the shunt arm, and may have such a temperature coefficient as to render the operation of the filter independent of ambient temperature changes.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE1955S0043960 DE1239414B (en) | 1955-05-16 | 1955-05-16 | Electric bandstop filter, which is realized by a bridged T-link |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB813852A true GB813852A (en) | 1959-05-27 |
Family
ID=7484946
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1514956A Expired GB813852A (en) | 1955-05-16 | 1956-05-15 | Improvements in or relating to band-stop electric wave filters |
Country Status (4)
| Country | Link |
|---|---|
| DE (1) | DE1239414B (en) |
| FR (1) | FR1149785A (en) |
| GB (1) | GB813852A (en) |
| NL (1) | NL112778C (en) |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1967250A (en) * | 1931-09-19 | 1934-07-24 | Bell Telephone Labor Inc | Wave filter |
| US2248776A (en) * | 1938-07-28 | 1941-07-08 | Bell Telephone Labor Inc | Wave filter |
| US2406796A (en) * | 1944-03-23 | 1946-09-03 | Bell Telephone Labor Inc | Wave filter |
-
0
- NL NL112778D patent/NL112778C/xx active
-
1955
- 1955-05-16 DE DE1955S0043960 patent/DE1239414B/en active Pending
-
1956
- 1956-05-15 GB GB1514956A patent/GB813852A/en not_active Expired
- 1956-05-16 FR FR1149785D patent/FR1149785A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| DE1239414B (en) | 1967-04-27 |
| FR1149785A (en) | 1957-12-31 |
| NL112778C (en) |
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