GB678379A - Improvements in or relating to electric wave filters - Google Patents
Improvements in or relating to electric wave filtersInfo
- Publication number
- GB678379A GB678379A GB1937149A GB1937149A GB678379A GB 678379 A GB678379 A GB 678379A GB 1937149 A GB1937149 A GB 1937149A GB 1937149 A GB1937149 A GB 1937149A GB 678379 A GB678379 A GB 678379A
- Authority
- GB
- United Kingdom
- Prior art keywords
- sections
- filter
- cut
- pass
- band stop
- 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
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/01—Frequency selective two-port networks
- H03H7/075—Ladder networks, e.g. electric wave filters
Landscapes
- Surface Acoustic Wave Elements And Circuit Networks Thereof (AREA)
Abstract
678,379. Electric filters. POSTMASTERGENERAL. April 13, 1951 [July 22, 1949], No. 19371/49. Drawings to Specification. Class 40 (viii). An electric wave filter comprises two or more sections connected in tandem, in which at least one of the sections has a cut-off frequency which is different from that finally required of the filter, and in which another section or sections is or are provided to produce a required sharp frequency cut-off. For example a lowpass filter may consist of an elementary lowpass section, whose cut-off is higher than that required, followed by one or a succession of band stop sections to give the necessary sharp cut-off. A high pass filter can similarly be made from a high-pass section and a number of band stop sections. A band stop filter can be made by connecting high-pass and low-pass filters of this character in tandem. The performance of the filter can be improved by the introduction of simple resistance attenuators between the sections. One or more of these attenuators can be replaced by constant impedance equalizer networks.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1937149A GB678379A (en) | 1949-07-22 | 1949-07-22 | Improvements in or relating to electric wave filters |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1937149A GB678379A (en) | 1949-07-22 | 1949-07-22 | Improvements in or relating to electric wave filters |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB678379A true GB678379A (en) | 1952-09-03 |
Family
ID=10128235
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1937149A Expired GB678379A (en) | 1949-07-22 | 1949-07-22 | Improvements in or relating to electric wave filters |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB678379A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116827306A (en) * | 2023-07-11 | 2023-09-29 | 青岛智腾微电子有限公司 | Active low pass filter circuit cuts off sharply |
-
1949
- 1949-07-22 GB GB1937149A patent/GB678379A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116827306A (en) * | 2023-07-11 | 2023-09-29 | 青岛智腾微电子有限公司 | Active low pass filter circuit cuts off sharply |
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