US1957538A - Electrical network - Google Patents

Electrical network Download PDF

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Publication number
US1957538A
US1957538A US544272A US54427231A US1957538A US 1957538 A US1957538 A US 1957538A US 544272 A US544272 A US 544272A US 54427231 A US54427231 A US 54427231A US 1957538 A US1957538 A US 1957538A
Authority
US
United States
Prior art keywords
conductor
resistors
attenuator
series
shunt
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
US544272A
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English (en)
Inventor
Axel G Jensen
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.)
AT&T Corp
Original Assignee
Bell Telephone 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
Priority to NL61489D priority Critical patent/NL61489B/xx
Priority to NL33645D priority patent/NL33645C/xx
Application filed by Bell Telephone Laboratories Inc filed Critical Bell Telephone Laboratories Inc
Priority to US544272A priority patent/US1957538A/en
Priority to GB16423/32A priority patent/GB402823A/en
Priority to FR739551D priority patent/FR739551A/fr
Application granted granted Critical
Publication of US1957538A publication Critical patent/US1957538A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/22—Attenuating devices
    • H01P1/225—Coaxial attenuators

Definitions

  • This invention relates to electrical networks and more particularly to attenuators adapted for use at very high frequencies.
  • An object of the invention is to enable high 5 attenuation to be obtained with great accuracy.
  • a further object is the elimination of leakage impedances in an attenuator which would tend to act as by-passing paths reducing the attenuation of the device.
  • a feature of the invention is the use of a construction resembling a coaxial conductor line, the outer conductor constituting an electrostatic l6 shield within which the attenuating impedances are enclosed.
  • Another feature is the use of resistance elements as the central conductor of the coaxial system in combination with disc or plate shaped resistors forming shunt impedances between the central and the outer conductors. In this way a multi-stage ladder type attenuating network is provided in which the individual stages are electrostatically shielded from each other.
  • a further feature of the invention is the adaptation of the coaxial construction to a variable .attenuator in which the property of complete electrostatic shieldinggis maintained.
  • Fig. 1 illustrates the invention-schematically and shows the manner of its connection into an electric circuit
  • Fig. 2 shows the embodiment of the invention in a variable attenuator
  • Fig. 3 shows an end view of the attenuator of Fig. 2.
  • the attenuating device which is shown schematically, comprises an outer conducting tube 10 within which are disposed a plurality of series resistors 11 and a plurality of resistors 12 forming shunt paths between the junction points of the series resistors and the outer conductor.
  • the resistors 11 are preferably of rod form and may consist of rods of insulating material, glass or porcelain or the like, coated with a thin film of metal.
  • Resistors 12 are of similar type in disc or plate form and should be of such size and shape as to fill the cross section of the tube.
  • the central resistors 11 constitute the line conductor and the outer conductor 10, the return path.
  • the outer conductor When the outer conductor is grounded or otherwise fixed in potential it acts as an electrostatic shield between the resistors and other apparatus. To make the shielding more complete the ends of the outer conductor may be partially closed as shown in the figure.
  • the shunt resistors 12 moreover act as electrostatic shields preventing direct capacity effectsbetween the several stages.
  • the figure shows the device connected between a line 13 and a shielded amplifier 14 through shielded transformers 15 and 16, the connections being made on one side to the outer ends of the terminal series resistors 11 and on the other side to the shielding conductor 10.
  • each decade group are assembled in a metallic drum or wheel 21, the rim of which is drilled with a number of holes parallel to the axis of the drum to receive the units.
  • the drums are mounted on a shaft 28 supported by metallic brackets 27 from a common base.
  • the brackets 2'7, besides supporting the shaft also carry coupling means for connecting selected units of the decade groups in tandem.
  • each bracket includes near its base an enlarged portion which is drilled with a hole corresponding to the holes in the peripheries of the drums.
  • the coupling elements each of which comprises an outer metallic tube 33, a central conductor 32 and a pair of insulating and spacing discs 29.
  • the central conductor 32 is arranged to make contact with the ends of the series resistors 39 and to insure that good electrical connection is obtained the ends are recessed to receive springs 31 and plungers 30 which bear firmly on the terminal caps of the series resistors.
  • bracket is recessed on both sides around tube 33 to accommodate contact rings 34, pressure on which is maintained by a plurality of springs 35 disposed at intervals around the recess.
  • a modification of the coupling means is provided to permit connection of 11 the attenuator to other apparatus, the tubular element and the central conductor being extended beyond the bracket in the manner shown.
  • the ends of the extended inner conductors are drilled and tapped to receive a screw or binding post 25 and a ring clamp 26 is provided on the outer conductor on which is mounted a terminal screw 44.
  • adjustment of the attenuation is accomplished by rotating the drums until units giving the desired value of attenuation are brought into axial alignment with the coupling sections.
  • the aligned sections then constitute a multisection line of the concentric conductor type as shown schematically in Fig. 1. Any suitable indexing arrangement, various types of which are well known, may be used for indicating the attenuation introduced by each section.
  • More drums may be added if a larger range of attenuation is to be covered, or if finer gradations are required.
  • Other groupings of the units than the decade system may also be used if desired.
  • An attenuation network comprising a tube of electrically conductive material, a plurality of longitudinal resistance elements arranged in serial order and concentrically located therein, and a separate shunt resistance connected between the said tube and each junction point formed by said longitudinal elements.
  • An attenuation network comprising a tube of electrically conductive material, a longitudinal resistance element concentrically located therein, the said element comprising a plurality of sections arranged end to end, and a plurality of shunt resistances each connected between the junction of adjacent sections of the said longiof the parallel with the axis of said drum and passing through a point on the circumference of acircle whose center is concentric with the center of said drum, each of said attenuator units comprising a tubular conductor and a plurality of resistance elements within said conductor disposed in seriesshunt relation to form a ladder-type line, the series resistance elements being disposed along the axis of said tubular conductor and the shunt resistance elements having a form symmetrical about the axis of said conductor and connecting the junction points of the series resistors with said conductor, a pair of input terminals, a pair of output terminals and means for connecting between said input terminals and said output terminals any one of said attenuator units.
  • a variable attenuator comprising a plurality of drums, a plurality of graduated attenuator units disposed about each of said drums at points equidistant from the center of said drum, the axes of said units being parallel with the axis of said drum, each of said attenuator units comprising a tubular conductor and a plurality of resistance elements within said conductor disposed in series-shunt relation to form a laddertype line, the series resistance elements being disposed along the axis of said tubular conductor and the shunt resistance elements having a form symmetrical about the axis of said conductor and connecting the junction points of the series resistors with said conductor, a pair of input terminals, a pair of output terminals and means for connecting between said input terminals and said output terminals various combinations of said attenuator units.
  • An electrical attenuator comprising a cylindrical conductor and a plurality of resistance elements within said conductor arranged in series-shunt relation to form a ladder-type line, the series resistance elements being disposed along the axis of said cylindrical conductor, and the shunt resistance elements being discs connecting the junction points of the series resistance elements with said cylindrical conductor.

Landscapes

  • Emergency Protection Circuit Devices (AREA)
  • Measurement Of Resistance Or Impedance (AREA)
  • Insulators (AREA)
  • Attenuators (AREA)
US544272A 1931-06-13 1931-06-13 Electrical network Expired - Lifetime US1957538A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
NL61489D NL61489B (en(2012)) 1931-06-13
NL33645D NL33645C (en(2012)) 1931-06-13
US544272A US1957538A (en) 1931-06-13 1931-06-13 Electrical network
GB16423/32A GB402823A (en) 1931-06-13 1932-06-10 Improvements in electrical impedance networks
FR739551D FR739551A (fr) 1931-06-13 1932-06-10 Perfectionnements aux réseaux électriques

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US544272A US1957538A (en) 1931-06-13 1931-06-13 Electrical network

Publications (1)

Publication Number Publication Date
US1957538A true US1957538A (en) 1934-05-08

Family

ID=24171494

Family Applications (1)

Application Number Title Priority Date Filing Date
US544272A Expired - Lifetime US1957538A (en) 1931-06-13 1931-06-13 Electrical network

Country Status (4)

Country Link
US (1) US1957538A (en(2012))
FR (1) FR739551A (en(2012))
GB (1) GB402823A (en(2012))
NL (2) NL61489B (en(2012))

Cited By (29)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2427940A (en) * 1943-01-28 1947-09-23 Rca Corp Transmission line switch
US2429401A (en) * 1943-06-18 1947-10-21 Arthur C Davis Coaxial cable device
US2434560A (en) * 1943-10-07 1948-01-13 Westinghouse Electric Corp Termination for transmission lines
US2494722A (en) * 1945-03-10 1950-01-17 Bell Telephone Labor Inc Resistive termination
US2514544A (en) * 1942-07-25 1950-07-11 Sperry Corp High-frequency attenuating device
US2515228A (en) * 1946-05-28 1950-07-18 Sperry Corp Attenuating apparatus for highfrequency energy
US2521828A (en) * 1946-06-25 1950-09-12 Western Electric Co Coaxial line attenuator
US2529436A (en) * 1944-06-14 1950-11-07 Polytechnic Inst Brooklyn Metal film attenuator
US2538771A (en) * 1944-08-02 1951-01-23 Sperry Corp High-frequency attenuator
US2539352A (en) * 1946-06-29 1951-01-23 Hewlett Packard Co Voltage attenuator
US2548024A (en) * 1949-12-02 1951-04-10 A F Smuckler & Co Inc Attenuator
US2561184A (en) * 1948-09-18 1951-07-17 Gen Electric Transmission line attenuator
US2576060A (en) * 1945-08-08 1951-11-20 James M Wolf Radio-frequency calorimeter wattmeter
US2575383A (en) * 1946-10-22 1951-11-20 Bell Telephone Labor Inc High-frequency amplifying device
US2597090A (en) * 1949-05-19 1952-05-20 Daven Company Variable attenuator
US2611101A (en) * 1947-04-15 1952-09-16 Wallauschek Richard Traeling wave amplifier tube
US2620396A (en) * 1950-09-05 1952-12-02 Stoddart Aircraft Radio Compan Ultrahigh-frequency attenuator
US2622178A (en) * 1946-04-22 1952-12-16 Blue Ridge Glass Corp Electric heating element and method of producing the same
US2624859A (en) * 1947-07-03 1953-01-06 Int Standard Electric Corp Traveling wave amplifier tube
US2626371A (en) * 1948-07-16 1953-01-20 Philco Corp Traveling wave tube attenuator
US2660690A (en) * 1948-10-15 1953-11-24 Sylvania Electric Prod Traveling wave tube
US2661441A (en) * 1947-12-31 1953-12-01 Bell Telephone Labor Inc High-frequency amplifier
US2667622A (en) * 1945-03-06 1954-01-26 Polytechnic Inst Brooklyn Coaxial cable attenuator matching device
US2689294A (en) * 1944-06-14 1954-09-14 Polytechnic Inst Brooklyn Metal film attenuator
US2712614A (en) * 1950-06-30 1955-07-05 Univ Leland Stanford Junior Travelling wave tubes
US2730649A (en) * 1950-02-04 1956-01-10 Itt Traveling wave amplifier
US2798981A (en) * 1952-08-19 1957-07-09 Itt Traveling wave electron discharge devices
DE1206042B (de) * 1963-07-25 1965-12-02 Siemens Ag Daempfungs- oder Laufzeitglied in Koaxial-bauweise
US3255425A (en) * 1961-07-26 1966-06-07 Holt Hardwood Company Variable resistance device

Cited By (29)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2514544A (en) * 1942-07-25 1950-07-11 Sperry Corp High-frequency attenuating device
US2427940A (en) * 1943-01-28 1947-09-23 Rca Corp Transmission line switch
US2429401A (en) * 1943-06-18 1947-10-21 Arthur C Davis Coaxial cable device
US2434560A (en) * 1943-10-07 1948-01-13 Westinghouse Electric Corp Termination for transmission lines
US2529436A (en) * 1944-06-14 1950-11-07 Polytechnic Inst Brooklyn Metal film attenuator
US2689294A (en) * 1944-06-14 1954-09-14 Polytechnic Inst Brooklyn Metal film attenuator
US2538771A (en) * 1944-08-02 1951-01-23 Sperry Corp High-frequency attenuator
US2667622A (en) * 1945-03-06 1954-01-26 Polytechnic Inst Brooklyn Coaxial cable attenuator matching device
US2494722A (en) * 1945-03-10 1950-01-17 Bell Telephone Labor Inc Resistive termination
US2576060A (en) * 1945-08-08 1951-11-20 James M Wolf Radio-frequency calorimeter wattmeter
US2622178A (en) * 1946-04-22 1952-12-16 Blue Ridge Glass Corp Electric heating element and method of producing the same
US2515228A (en) * 1946-05-28 1950-07-18 Sperry Corp Attenuating apparatus for highfrequency energy
US2521828A (en) * 1946-06-25 1950-09-12 Western Electric Co Coaxial line attenuator
US2539352A (en) * 1946-06-29 1951-01-23 Hewlett Packard Co Voltage attenuator
US2575383A (en) * 1946-10-22 1951-11-20 Bell Telephone Labor Inc High-frequency amplifying device
US2611101A (en) * 1947-04-15 1952-09-16 Wallauschek Richard Traeling wave amplifier tube
US2624859A (en) * 1947-07-03 1953-01-06 Int Standard Electric Corp Traveling wave amplifier tube
US2661441A (en) * 1947-12-31 1953-12-01 Bell Telephone Labor Inc High-frequency amplifier
US2626371A (en) * 1948-07-16 1953-01-20 Philco Corp Traveling wave tube attenuator
US2561184A (en) * 1948-09-18 1951-07-17 Gen Electric Transmission line attenuator
US2660690A (en) * 1948-10-15 1953-11-24 Sylvania Electric Prod Traveling wave tube
US2597090A (en) * 1949-05-19 1952-05-20 Daven Company Variable attenuator
US2548024A (en) * 1949-12-02 1951-04-10 A F Smuckler & Co Inc Attenuator
US2730649A (en) * 1950-02-04 1956-01-10 Itt Traveling wave amplifier
US2712614A (en) * 1950-06-30 1955-07-05 Univ Leland Stanford Junior Travelling wave tubes
US2620396A (en) * 1950-09-05 1952-12-02 Stoddart Aircraft Radio Compan Ultrahigh-frequency attenuator
US2798981A (en) * 1952-08-19 1957-07-09 Itt Traveling wave electron discharge devices
US3255425A (en) * 1961-07-26 1966-06-07 Holt Hardwood Company Variable resistance device
DE1206042B (de) * 1963-07-25 1965-12-02 Siemens Ag Daempfungs- oder Laufzeitglied in Koaxial-bauweise

Also Published As

Publication number Publication date
GB402823A (en) 1933-12-11
NL61489B (en(2012))
FR739551A (fr) 1933-01-13
NL33645C (en(2012))

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