GB817903A - Improvements in or relating to tuning circuits for operation at very high frequencies - Google Patents
Improvements in or relating to tuning circuits for operation at very high frequenciesInfo
- Publication number
- GB817903A GB817903A GB1619056A GB1619056A GB817903A GB 817903 A GB817903 A GB 817903A GB 1619056 A GB1619056 A GB 1619056A GB 1619056 A GB1619056 A GB 1619056A GB 817903 A GB817903 A GB 817903A
- Authority
- GB
- United Kingdom
- Prior art keywords
- circuit
- capacitor
- tuning
- plunger
- 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
- 239000003990 capacitor Substances 0.000 abstract 7
- 230000000712 assembly Effects 0.000 abstract 2
- 239000000919 ceramic Substances 0.000 abstract 2
- 229910052751 metal Inorganic materials 0.000 abstract 2
- 239000002184 metal Substances 0.000 abstract 2
- BQCADISMDOOEFD-UHFFFAOYSA-N silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 abstract 2
- 229910052709 silver Inorganic materials 0.000 abstract 2
- 239000004332 silver Substances 0.000 abstract 2
- KNXVOGGZOFOROK-UHFFFAOYSA-N trimagnesium;dioxido(oxo)silane;hydroxy-oxido-oxosilane Chemical compound [Mg+2].[Mg+2].[Mg+2].O[Si]([O-])=O.O[Si]([O-])=O.[O-][Si]([O-])=O.[O-][Si]([O-])=O KNXVOGGZOFOROK-UHFFFAOYSA-N 0.000 abstract 2
- JRPBQTZRNDNNOP-UHFFFAOYSA-N Barium titanate Chemical compound [Ba+2].[Ba+2].[O-][Ti]([O-])([O-])[O-] JRPBQTZRNDNNOP-UHFFFAOYSA-N 0.000 abstract 1
- 229910001369 Brass Inorganic materials 0.000 abstract 1
- AOWKSNWVBZGMTJ-UHFFFAOYSA-N Calcium titanate Chemical compound [Ca+2].[O-][Ti]([O-])=O AOWKSNWVBZGMTJ-UHFFFAOYSA-N 0.000 abstract 1
- 239000000654 additive Substances 0.000 abstract 1
- 230000005540 biological transmission Effects 0.000 abstract 1
- 239000010951 brass Substances 0.000 abstract 1
- 239000011248 coating agent Substances 0.000 abstract 1
- 238000000576 coating method Methods 0.000 abstract 1
- 238000010276 construction Methods 0.000 abstract 1
- 239000011521 glass Substances 0.000 abstract 1
- XSETZKVZGUWPFM-UHFFFAOYSA-N magnesium;oxygen(2-);titanium(4+) Chemical compound [O-2].[O-2].[O-2].[Mg+2].[Ti+4] XSETZKVZGUWPFM-UHFFFAOYSA-N 0.000 abstract 1
- 239000004033 plastic Substances 0.000 abstract 1
- 229910052904 quartz Inorganic materials 0.000 abstract 1
- 239000010453 quartz Substances 0.000 abstract 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P7/00—Resonators of the waveguide type
- H01P7/02—Lecher resonators
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/008—Details of transformers or inductances, in general with temperature compensation
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Fixed Capacitors And Capacitor Manufacturing Machines (AREA)
- Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
Abstract
817,903. Variable capacitors; circuit assemblies. ELECTRIC & MUSICAL INDUSTRIES Ltd. May 27,1957 [May 25,1956], No. 16190/56. Class 37. [Also in Groups XL (b) and XL (c)] A variable capacitor for use in a V.H.F. tuning circuit comprises two spaced conducting elements 2, 3 of a transmission line, constituting the stators of a split stator capacitor, a tuning member 6 adjustable axially of said line, and a dielectric 1 having a temperature coefficient of expansion and a permittivity which varies with temperature so as to neutralize frequency changes in the circuit caused by temperature variation. A hollow cylindrical member 1 of ceramic, such as steatite, supports at one end two silver line elements 2, 3 which are separated by longitudinal gaps; and a cup-shaped tuning plunger 6 of silver-coated brass is adjustably mounted in the lower part of said cylinder. Introduction of a desired length of the plunger between the elements provides a capacity between each element and the plunger, and this is maintained constant on the longitudinal expansion of members 2, 3 and 6 by the compensating properties of the dielectric. Additives, e.g. calcium, barium, or magnesium titanate, cause the steatite to have a negative positive or zero coefficient of expansion, and a permittivity which decreases as its temperature increases. In an alternative construction, the line elements and the tuning member are tapered. Quartz, glass, or plastic dielectric may be used in place of ceramic. The capacitor is screened by a metallic cylinder 12. Assemblies. Fig. 2 shows the capacitor, with the screen 12 removed, embodied in an oscillator circuit. The circuit comprises, in addition to the variable capacitor, inductors LI, 12, output coil 17a and resistor Rlmounted between metal discs 7, 8, fixed capacitors C1, C2, C3 formed as insulating bushes whose inner surfaces have a metal coating and mounted within holes in the disc 8, and a valve housed within a screen 13 arranged above the disc 7. The circuit also comprises two further indicators, not shown.
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB817903A true GB817903A (en) | 1959-08-06 |
Family
ID=1732133
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1619056A Expired GB817903A (en) | 1956-05-25 | Improvements in or relating to tuning circuits for operation at very high frequencies |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB817903A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2317811A1 (en) * | 1975-07-11 | 1977-02-04 | Thomson Csf | Temp. stable LC filter - has insulating former and outer coil and inner moving plate as capacitor plates |
| CN117439341A (en) * | 2023-10-19 | 2024-01-23 | 北京核力同创科技有限公司 | Cyclotron frequency tuning device based on electric push cylinder structure |
-
1956
- 1956-05-25 GB GB1619056A patent/GB817903A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2317811A1 (en) * | 1975-07-11 | 1977-02-04 | Thomson Csf | Temp. stable LC filter - has insulating former and outer coil and inner moving plate as capacitor plates |
| CN117439341A (en) * | 2023-10-19 | 2024-01-23 | 北京核力同创科技有限公司 | Cyclotron frequency tuning device based on electric push cylinder structure |
| CN117439341B (en) * | 2023-10-19 | 2024-04-26 | 国电投核力同创(北京)科技有限公司 | Cyclotron frequency tuning device based on electric push cylinder structure |
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