GB515194A - Improvements in coupling devices for high-frequency electric circuits - Google Patents

Improvements in coupling devices for high-frequency electric circuits

Info

Publication number
GB515194A
GB515194A GB14572/38A GB1457238A GB515194A GB 515194 A GB515194 A GB 515194A GB 14572/38 A GB14572/38 A GB 14572/38A GB 1457238 A GB1457238 A GB 1457238A GB 515194 A GB515194 A GB 515194A
Authority
GB
United Kingdom
Prior art keywords
coupling
tuning
selectivity
pair
coils
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
Application number
GB14572/38A
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.)
Johnson Laboratories Inc
Original Assignee
Johnson Laboratories Inc
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 Johnson Laboratories Inc filed Critical Johnson Laboratories Inc
Publication of GB515194A publication Critical patent/GB515194A/en
Expired legal-status Critical Current

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
    • H03H7/0153—Electrical filters; Controlling thereof
    • H03H7/0161—Bandpass filters
    • H03H7/0169—Intermediate frequency filters
    • H03H7/0184—Intermediate frequency filters with ferromagnetic core

Landscapes

  • Amplifiers (AREA)
  • Magnetic Resonance Imaging Apparatus (AREA)

Abstract

515,194. Wireless receiving sets; impedance networks; transformers. JOHNSON LABORATORIES, INC. May 16, 1938, No. 14572. Convention date, June 3, 1937. [Classes 40 (iii) and 40 (v)] [Also in Group XXXV] The coupling between a pair of tuned circuits, in an intermediate-frequency amplifier for instance, is varied simultaneously with the tuning of the circuits, so as to keep the selectivity or band-width constant when the tuning is being adjusted, by the use of a pair of magnetic cores 6 whose position can be set by means of screws 11. As the cores 6 within the insulating tube 7 are moved away from one another into the coils 4, the self-inductance of the coils increases while their mutual inductance decreases. At the same time their ratio Q of reactance to resistance increases and the effect on selectivity of this increase is compensated by the effect of the decrease of the mutual inductance. The condensers 5 are mounted on the insulating base 9 of the assembly, within a shield can 3. The coupling is slightly above the critical coupling. Specifications 468,675 and 515,305, are referred to.
GB14572/38A 1937-06-03 1938-05-16 Improvements in coupling devices for high-frequency electric circuits Expired GB515194A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US515194XA 1937-06-03 1937-06-03

Publications (1)

Publication Number Publication Date
GB515194A true GB515194A (en) 1939-11-28

Family

ID=21971807

Family Applications (1)

Application Number Title Priority Date Filing Date
GB14572/38A Expired GB515194A (en) 1937-06-03 1938-05-16 Improvements in coupling devices for high-frequency electric circuits

Country Status (1)

Country Link
GB (1) GB515194A (en)

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