US2285437A - High frequency system - Google Patents

High frequency system Download PDF

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Publication number
US2285437A
US2285437A US193659A US19365938A US2285437A US 2285437 A US2285437 A US 2285437A US 193659 A US193659 A US 193659A US 19365938 A US19365938 A US 19365938A US 2285437 A US2285437 A US 2285437A
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US
United States
Prior art keywords
high frequency
cathode
tube
shielding
stages
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
Application number
US193659A
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English (en)
Inventor
Johannson Helmuth
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Alcatel Lucent Deutschland AG
C Lorenz AG
Original Assignee
Standard Elektrik Lorenz AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Standard Elektrik Lorenz AG filed Critical Standard Elektrik Lorenz AG
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Publication of US2285437A publication Critical patent/US2285437A/en
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Expired - Lifetime legal-status Critical Current

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    • 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 invention relates to high frequency systems and particularly to improvements in the shielding arrangements employed between the different stages of such systems.
  • Fig, l diagrammatically illustrates a known shielding arrangement for high frequency systems; while Fig., 2 shows the application of the inventive idea to the known system of Fig. 1.
  • Fig. 1 by way of an example illustrates one of the known shielding arrangements above referred to.
  • the first high frequency amplifying or generating stage comprises a tube 2 and an oscillatory circuit 3 arranged together in a shielding device I. It is common practice in such arrangements to connect the cathode 4 to a point 5 of the shielding device.
  • the high frequency oscillations generated or amplified in this stage are applied to the succeeding stage through a condenser 8 and a shielded line 1.
  • the second stage is likewise provided in a shielding device 8 and the cathode 9 of the tube Il) is connected to the point 5 cf this shielding device.
  • the interfering voltages betwen the two shields travel over the connecting point 5 of the cathode of tube 2 and through the capacity S to the shielded line 'l and set up a potential drop across the grid resistance Il of the second stage. This voltage change is then amplified in the second stage and becomes audible as disturbing noise.
  • Fig, 2 This arrangement applied between two amplication stages is illustrated in Fig, 2.
  • the indi- 10 vidual circuit elements carry the same reference numerals as in Fig. 1.
  • the connections between the cathodes and the shield members of each stage have been omitted, while a particular cathode potential line I2 has been added and.
  • the shielding arrangement according to the invention is applicable to all receiving, transmitting and amplifying high frequency devices.
  • a multi-stage high frequency system of the type comprising first and second vacuum tubes each having an indirectly heated cathode, a grid and an anode, rst and second separate conductive chambers respectively enclosing said tubes, a conductive conduit extending between said chambers and connected therewith, -high frequency coupling means of the condenser-andresistance coupling type including an interstage lead extending through said conduit for transferring high frequency energy from the anode of said nrst tube to the grid of said second tube, characterized in that at least one of said cathodes is electrically separate from the corresponding conductive chamber and that a cathode potential lead distinct from said conductive chambers is provided which extends through said conduit to connect said two cathodes together.
  • a high frequency system comprising a plurality of tubes each having an indirectly heated cathode, a grid and an anode, circuit elements including a high frequency connection from the anode of one of said tubes to the grid of another of said tubes which together with said tubes form a plurality of cascade connected high frequency stages, a shield for each of the high frequency stages said shields being formed as separate screening boxes, further shielding means surrounding said high frequency connection said further shielding means being formed as a conduit of substantial length interconnecting said separate boxes, and a separate cathode ⁇ potential lead interconnecting the cathodes of the individual tubes and disposed Within said further shielding means but insulated therefrom, at least one of said cathodes being electrically insulated from its shield.
  • a multi-stage high frequency system comprising rst and second vacuum tubes each having indirectly heated cathode, grid and anode, rst and second separate conductive chambers v respectively enclosing said tubes and electrically connected together, said interconnected chambers being electrically connected to at most one of said cathodes, a high impedance circuit between the grid and the cathode of said second tube, a conductive and capacitative connection from the anode of said rst tube to the grid of said second tube for transferring high frequency energy from the anode of said first tube to the grid of said second tube, a lead connecting the cathode of said rst tube to the cathode of said second tube independent of said conductive chambers, and a common shielding conduit shielding both said leads but insulated therefrom.

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  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Amplifiers (AREA)
  • Analysing Materials By The Use Of Radiation (AREA)
US193659A 1937-03-06 1938-03-03 High frequency system Expired - Lifetime US2285437A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE201782X 1937-03-06

Publications (1)

Publication Number Publication Date
US2285437A true US2285437A (en) 1942-06-09

Family

ID=5768055

Family Applications (1)

Application Number Title Priority Date Filing Date
US193659A Expired - Lifetime US2285437A (en) 1937-03-06 1938-03-03 High frequency system

Country Status (5)

Country Link
US (1) US2285437A (de)
BE (1) BE426703A (de)
CH (1) CH201782A (de)
FR (1) FR834727A (de)
GB (1) GB492641A (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2416831A (en) * 1942-08-06 1947-03-04 Electronic Lab Inc Radio transmitter amplifier
US2417464A (en) * 1945-03-06 1947-03-18 Duro Test Corp Metal container
US2484245A (en) * 1944-08-31 1949-10-11 Westinghouse Electric Corp Rectifier
US2489245A (en) * 1946-03-21 1949-11-22 Chicago Title And Trust Compan Electrical apparatus
US3204201A (en) * 1960-05-18 1965-08-31 Vidar Corp Shielded circuit

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2416831A (en) * 1942-08-06 1947-03-04 Electronic Lab Inc Radio transmitter amplifier
US2484245A (en) * 1944-08-31 1949-10-11 Westinghouse Electric Corp Rectifier
US2417464A (en) * 1945-03-06 1947-03-18 Duro Test Corp Metal container
US2489245A (en) * 1946-03-21 1949-11-22 Chicago Title And Trust Compan Electrical apparatus
US3204201A (en) * 1960-05-18 1965-08-31 Vidar Corp Shielded circuit

Also Published As

Publication number Publication date
GB492641A (en) 1938-09-23
FR834727A (fr) 1938-11-30
CH201782A (de) 1938-12-15
BE426703A (de) 1938-04-30

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