US2208370A - Screening high frequency devices - Google Patents
Screening high frequency devices Download PDFInfo
- Publication number
- US2208370A US2208370A US161293A US16129337A US2208370A US 2208370 A US2208370 A US 2208370A US 161293 A US161293 A US 161293A US 16129337 A US16129337 A US 16129337A US 2208370 A US2208370 A US 2208370A
- Authority
- US
- United States
- Prior art keywords
- high frequency
- shield
- cathode
- frequency devices
- screening high
- 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 - Lifetime
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J5/00—Details relating to vessels or to leading-in conductors common to two or more basic types of discharge tubes or lamps
- H01J5/02—Vessels; Containers; Shields associated therewith; Vacuum locks
- H01J5/12—Double-wall vessels or containers
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0064—Earth or grounding circuit
Definitions
- the cathode potenial is not equal to the earth potential, there being disturbing alternating potentials which can readily enter the working-current circuits, especially at certain parts of the circuit arrangement, and in such case are able to disturb the entire arrangement.
- the parts in a circuit arrangement which are particularly easy to disturb in this way are the grid leak resistance and the coupling condenser of electron tube stages.
- the electron tube I, grid leak resistance 2, grid battery l2, and coupling condenser 3 are 35 contained in a screening shield d. Resistance 2 and condenser 3 are fixedly mounted therein and are adapted by a contact D to join the grid voltage supply lead 5.
- Shield 4 is given cathode potential through a conductor 1', ID denoting the cathode, and has, as illustrated in dotted lines, the space capacity 6 with respect to the grounded part of the equipment, indicated in a purely diagrammatic manner at I i. It will be seen that 5 disturbing potentials cannot be transferred by the space capacity 6 because shield 4 renders it impossible for them to cause a drop of potential across resistance 2.
- Tube l is seated in a socket il fixed on a base plate 9. By removing the shield 10 i the supply leads connected to parts 2, 3 are interrupted at contacts A and B. Y
- the novel arrangement insures an efiicient screening especially in the case of tube stages in high frequency apparatus where it is not possible to apply earth potential to the cathodes.
- a high frequency arrangement having grounded parts and a base plate, an electron tube supported from said base plate and having a cathode electrically separate from said grounded parts, and a grid electrically separate from said cathode; a grid contact supported from said tube and connected to said grid; a cathode contact connected to said cathode; a removable pot-shaped shield shaped and normally positioned to closely surround said tube; a coupling condenser and a grid leak resistance disposed within said shield and fixed thereto; a first contacting means connected to said condenser and resistance and positioned to engage said grid contact to make connection therewith when said shield is placed in normal position; and a second contacting means connected to said shield and positioned to engage said cathode contact when said shield is placed in normal position.
Description
July 16, 1940. HI. JOHANNSON 2,208,370
SCREENING HIGH FREQUENCY DEVICES Filed Aug. 27, 1937 Patented July 16, 1940 arcane FFEQE SCREENING HIGH FREQUENCY DEVICES i-lelniut Johannson, Berlin-Charlottenburg, Germany, a-ssignor to C. Lorenz Aktiengesellschait,
Berlin-Tempelhof, Lorenzweg,
company Germany, 2.
Application August 27, 1937, Serial No. 161,293 In Germany August 27, 1936 1 Claim.
In the construction of high frequency apparatus it is well known to screen certain elements thereof, such as coils, electron tubes and the like, by a metallic casing to which earth potential is applied. In circuit arrangements of this kind the earth potential is in general equal to the cathode potential, the screenings thus having both earth and cathode potentials.
In certain cases however the cathode potenial is not equal to the earth potential, there being disturbing alternating potentials which can readily enter the working-current circuits, especially at certain parts of the circuit arrangement, and in such case are able to disturb the entire arrangement. The parts in a circuit arrangement which are particularly easy to disturb in this way are the grid leak resistance and the coupling condenser of electron tube stages.
In order to avoid such disturbances it is proposed by the invention to arrange the coupling condenser and the grid leak resistance together with the electron tube to be screened in a shield common to them and to connect this shield to the cathode. In this way disturbing alternating potentials are prevented from being transmitted by the space capacity to this condenser and resistance.
One embodiment of the invention is described hereafter, reference being had to the accom- 30 panying drawing which is a diagrammatic sectional View showing this embodiment by way of example.
The electron tube I, grid leak resistance 2, grid battery l2, and coupling condenser 3 are 35 contained in a screening shield d. Resistance 2 and condenser 3 are fixedly mounted therein and are adapted by a contact D to join the grid voltage supply lead 5. Shield 4 is given cathode potential through a conductor 1', ID denoting the cathode, and has, as illustrated in dotted lines, the space capacity 6 with respect to the grounded part of the equipment, indicated in a purely diagrammatic manner at I i. It will be seen that 5 disturbing potentials cannot be transferred by the space capacity 6 because shield 4 renders it impossible for them to cause a drop of potential across resistance 2. Tube l is seated in a socket il fixed on a base plate 9. By removing the shield 10 i the supply leads connected to parts 2, 3 are interrupted at contacts A and B. Y
The novel arrangement insures an efiicient screening especially in the case of tube stages in high frequency apparatus where it is not possible to apply earth potential to the cathodes.
What is claimed is:
A high frequency arrangement having grounded parts and a base plate, an electron tube supported from said base plate and having a cathode electrically separate from said grounded parts, and a grid electrically separate from said cathode; a grid contact supported from said tube and connected to said grid; a cathode contact connected to said cathode; a removable pot-shaped shield shaped and normally positioned to closely surround said tube; a coupling condenser and a grid leak resistance disposed within said shield and fixed thereto; a first contacting means connected to said condenser and resistance and positioned to engage said grid contact to make connection therewith when said shield is placed in normal position; and a second contacting means connected to said shield and positioned to engage said cathode contact when said shield is placed in normal position.
HELMUT JOHANNSON.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE506419X | 1936-08-27 |
Publications (1)
Publication Number | Publication Date |
---|---|
US2208370A true US2208370A (en) | 1940-07-16 |
Family
ID=6546551
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US161293A Expired - Lifetime US2208370A (en) | 1936-08-27 | 1937-08-27 | Screening high frequency devices |
Country Status (3)
Country | Link |
---|---|
US (1) | US2208370A (en) |
FR (1) | FR825994A (en) |
GB (1) | GB506419A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3020447A (en) * | 1958-10-27 | 1962-02-06 | Raytheon Co | Magnetron systems |
-
1937
- 1937-08-25 FR FR825994D patent/FR825994A/en not_active Expired
- 1937-08-25 GB GB23334/37A patent/GB506419A/en not_active Expired
- 1937-08-27 US US161293A patent/US2208370A/en not_active Expired - Lifetime
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3020447A (en) * | 1958-10-27 | 1962-02-06 | Raytheon Co | Magnetron systems |
Also Published As
Publication number | Publication date |
---|---|
GB506419A (en) | 1939-05-26 |
FR825994A (en) | 1938-03-18 |
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