GB1149764A - Improvements in or relating to filter circuit components - Google Patents
Improvements in or relating to filter circuit componentsInfo
- Publication number
- GB1149764A GB1149764A GB2707065A GB2707065A GB1149764A GB 1149764 A GB1149764 A GB 1149764A GB 2707065 A GB2707065 A GB 2707065A GB 2707065 A GB2707065 A GB 2707065A GB 1149764 A GB1149764 A GB 1149764A
- Authority
- GB
- United Kingdom
- Prior art keywords
- resistive
- length
- series resistance
- line
- dielectric
- 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
- H03H1/00—Constructional details of impedance networks whose electrical mode of operation is not specified or applicable to more than one type of network
- H03H1/02—Constructional details of impedance networks whose electrical mode of operation is not specified or applicable to more than one type of network of RC networks, e.g. integrated networks
Landscapes
- Filters And Equalizers (AREA)
Abstract
1,149,764. Filter networks. MINISTER OF TECHNOLOGY. 15 July, 1966 [25 June, 1965], No. 27070/65. Heading H3U. A filter comprises a length of transmission line having series resistance in milliohms/mm. and shunt capacitance in nanofarads/mm. whose product exceeds unity. As shown, the line consists of a copper inner conductor 1 upon which are formed a dielectric coating 2 of glass and a resistive coating 3 of tin oxide forming an outer conductor. A resistor 8 is connected between the inner conductor and earth and connections made as indicated. It is stated that the value of resistor 8 for best selectivity is given by dividing the resistance of layer 3 by a factory of 17À8 whereby an attenuation notch occurs at a frequency f 0 given by 2#f 0 RC = 11À8 where R and C are respectively the total series resistance of the length of line used and the total shunt capacitance in ohms and farads. The frequency f 0 may be varied by changing the length of the line. A variable embodiment is described (Fig. 5, not shown) in which the resistive elements 3, 8 are in the form of concentric circular resistive tracks (18, 19) cooperating with wipers (21, 22) carried by the same rotatable radial arm (20). The outer track (18) which provides series resistance 3, is formed upon a dielectric layer (17) which in turn is formed upon a conductive layer (12) providing conductor 1. The various tracks and layers are all carried by an insulative substrate, e.g. of glass or alumina. The conductive, dielectric and resistive materials may be aluminium, tantalum pentoxide and tantalum respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2707065A GB1149764A (en) | 1965-06-25 | 1965-06-25 | Improvements in or relating to filter circuit components |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2707065A GB1149764A (en) | 1965-06-25 | 1965-06-25 | Improvements in or relating to filter circuit components |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1149764A true GB1149764A (en) | 1969-04-23 |
Family
ID=10253677
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2707065A Expired GB1149764A (en) | 1965-06-25 | 1965-06-25 | Improvements in or relating to filter circuit components |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1149764A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1981002652A1 (en) * | 1980-03-11 | 1981-09-17 | S Leppaevuori | A compound with trimmable electric impedance i.e.a stub |
-
1965
- 1965-06-25 GB GB2707065A patent/GB1149764A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1981002652A1 (en) * | 1980-03-11 | 1981-09-17 | S Leppaevuori | A compound with trimmable electric impedance i.e.a stub |
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