US2600466A - Wave guide attenuator - Google Patents

Wave guide attenuator Download PDF

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Publication number
US2600466A
US2600466A US486013A US48601343A US2600466A US 2600466 A US2600466 A US 2600466A US 486013 A US486013 A US 486013A US 48601343 A US48601343 A US 48601343A US 2600466 A US2600466 A US 2600466A
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US
United States
Prior art keywords
section
septum
attenuator
wave guide
resistive
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
US486013A
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English (en)
Inventor
Arnold E Bowen
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 NL71519D priority Critical patent/NL71519C/xx
Application filed by Bell Telephone Laboratories Inc filed Critical Bell Telephone Laboratories Inc
Priority to US486013A priority patent/US2600466A/en
Application granted granted Critical
Publication of US2600466A publication Critical patent/US2600466A/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

Definitions

  • This invention relates to wave transmission network and more particularly to an attenuator for guided electromagnetic waves.
  • An object of the invention is to attenuate guided electromagnetic waves.
  • Another object is to provide a wave guide attenuator which may be continuously varied from zero to any chosen upper limit of attentuation.
  • the present invention provides a wave guide attenuator which is continuously variable from zero to any desired maximum value.
  • the attenuator comprises a section of metallic pipe wave guide within which is longitudinally positioned a resistive septum.
  • means are provided for moving the septum sidewise and thereby varying the separation between the septum and a side of the waveguide.
  • the guide is of rectangular cross-section and the septum is parallel to a side of the section.
  • Fig. 1 is a perspective vview of a wave guide attenuator in accordance with the invention
  • Fig. 2 is a plan view, partly in section, of the attenuator of Fig. 1;
  • Fig. 3 is. a perspective view of theresistive septum used in the attenuator shown in Figs. 1 and 2.
  • the attenuator comprises a section of metallic pipe wave guide I of rectangular cross-section, a resistive septum 2 positioned within the section I substantially parallel to the shorter dimensioned side 3 of the section I and means for moving the septum 2 either toward or away from the side 3.
  • Each end of the section I is provided with a flange 4 for connecting the attenuator to an adjacent section ofwave guide.
  • the flange 4 may be provided with aligning pins 5 which fit into holes such as 6 in a flange on the end of the adjacent section of, guide.
  • They section I is made of a metal or an alloy having good electrical conductivity such, for example, as brass, and is preferably plated on the inside with precious metal such, for example, as silver or platinum.
  • the septum 2 is moved by means of a rod I to the inner endof which the septum 2 is fastened by a screw 8 which passes through a cen tral hole in-the-septum2 and screwsinto a tapped hole in the end of the rod I.
  • the rod? 1 slides in a hole 9-in the lower block I0 and: passes through a hole II in the side 3 ofthe guide section I.
  • the rod I is actuated by means of the rack I2-, which is fastenedto the rod I, and the pinion'gear I3.
  • the pinion I3-. is on the lower end of a shaft I4 which passes through a hole in the upper block I5.
  • the dial I8 and knob I9 are fastened tothe upper end of the shaft I4 by the setscrew20-and a pointer orindex 2
  • the calibration 22 may conveniently be made directly in decibels.
  • the septum 2- consists of a plate of suitable insulating materialsuch, for example, as phenol fibre, coated on the face toward the side 3 with one or more layers of resistive material 23.
  • the resistive material may, forexample, be a mixture of finely divided graphite and-a suit.- able binder, sprayed onto the side ofrthe septum 2 in one or more coats.
  • the endsofrthe septum 2 are preferably specially. shapedto reduce. the reflection effects when the section lis inserted into the wave guide system. Asv shown at 24 and 25 in Fig. 3, this special shaping mayxtake the form of' arectangular notch, the optimum depth and-width of whicharebest determined by trial.
  • the central'hole' 26 in the septum 2 may be extended on each side in the longitudinal direction, as shown at 21 and 28. The optimum dimensions for these extensions are also best found by trial.
  • the amount of attenuation introduced by the attenuator depends primarily upon the length, width and thickness of the-resistive coating" 23 and the distance between the septum 2 and the side 3 of the section I.
  • the attenuation is substantially zero.
  • the desired attenuation is obtained by turning the knob l9 which rotates the pinion gear [3 and, acting through the rack 12, pushes the rod 1 either in or out and thus determines the separation between the side 3 and the septum 2, which is fastened to the end of the rod 1.
  • a maximum attenuation of as high as 40 decibels has been obtained with a variable attenuator of the type disclosed herein.
  • An attenuator comprising a section of metallic pipe wave guide and a resistive septum longitudinally positioned within said section and spaced from a side of said section, the ends of said septum being notched.
  • An attenuator comprising a section of metallic pipe wave guide of rectangular cross-section and a resistive septum positioned within said section substantially parallel to, but separated from, a side of said section, the ends of said septum being notched.
  • a variable attenuator comprising a section of metallic pipe wave guide, a resistive septum longitudinally positioned within said section and means for moving said septum laterally.
  • septum comprises a Plate 0f insulating material coated on a major face with re sistive material.
  • a variable attenuator comprising a section of metallic pipe wave guide of rectangular crosssection, a resistive septum positioned within said section substantially parallel to a side of said section and means for moving said septum laterally.
  • septum comprises a plate of insulating material coated on a major face with resistive material.
  • An attenuator for use in a wave guide in which high frequency electric waves are propagated comprising a wave guide portion having a mode of propagation in which the maximum intensity electric vector lies in a flat plane symmetrically through and longitudinal of said guide portion, a thin, flat resistance member carried by said guide section andhaving an effective portion thereof lying in a plane parallel to the maxi- 4 mum intensity electric vector and means for moving said effective portion from a region of minimum electric field intensity to a region of maximum electric field intensity whereby a continuously variable degree of attenuation may be provided.
  • a variable attenuator comprising a section of metallic pipe wave guide, a resistive septum longitudinally positioned within said section and means for moving said septum laterally, in which the ends of said septum are specially shaped to reduce reflection.
  • a variable attenuator comprising a section of metallic pipe wave guide of rectangular crosssection, a resistive septum positioned within said section substantially parallel to a side of said section and means for moving said septum laterally, in which the ends of said septum are specially shaped to reduce reflection.
  • a variable attenuator comprising a section of metallic pipe wave guide of rectangular crosssection, a resistive septum positioned within said section substantially parallel to a side of said section and means for moving said septum laterally, in which said means permit moving said septum from a position adjacent to a side of said section to a position approximately half-way across said section.
  • An attenuator for a rectangular wave guide comprising a relatively thin plate of dielectric material carrying on at least one broad face thereof a loss-producing coating, said plate being mounted within said guide with its plan parallel with the electric field in said wave guide, and means at one end of said plate for matching the input impedance of said attenuator to the characteristic impedance of said wave guide.
  • An attenuator comprising a section of metallic pipe wave conductor, an elongated dielectric carrier longitudinally positioned within said section, a coating of resistive material on the main section of said carrier, and at least one end portion of said carrier having a resistive coating of a different resistance value per unit length of the carrier than the coating on said main section to reduce wave reflection in said conductor.
  • An attenuator comprising a section of metallic pipe wave conductor, an elongated dielectric carrier longitudinally positioned within said section, a coating of resistive material on th main section of said carrier, and at least one end portion of said carrier having a resistive coating specially shaped to reduce wave reflection in said conductor.

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US486013A 1943-05-07 1943-05-07 Wave guide attenuator Expired - Lifetime US2600466A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
NL71519D NL71519C (enrdf_load_stackoverflow) 1943-05-07
US486013A US2600466A (en) 1943-05-07 1943-05-07 Wave guide attenuator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US486013A US2600466A (en) 1943-05-07 1943-05-07 Wave guide attenuator

Publications (1)

Publication Number Publication Date
US2600466A true US2600466A (en) 1952-06-17

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US486013A Expired - Lifetime US2600466A (en) 1943-05-07 1943-05-07 Wave guide attenuator

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US (1) US2600466A (enrdf_load_stackoverflow)
NL (1) NL71519C (enrdf_load_stackoverflow)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2705779A (en) * 1952-03-18 1955-04-05 Polytechnic Inst Attenuator units for waveguides
US2705780A (en) * 1946-11-02 1955-04-05 Polytechnie Inst Matched resistance film type wave guide attenuators
US2731603A (en) * 1946-11-02 1956-01-17 Polytechnic Inst Brooklyn Matched wave guide attenuators
US2760171A (en) * 1951-04-20 1956-08-21 Bell Telephone Labor Inc Wave-guide mode filter
US2796588A (en) * 1946-02-01 1957-06-18 Richard M Walker Compact waveguide attenuator
US2856589A (en) * 1954-04-20 1958-10-14 Rca Corp Light-controlled waveguide attenuator
US3080540A (en) * 1960-10-05 1963-03-05 Narda Microwave Corp Wave guide attenuator using shaped absorber of iron powder loaded resin to equalize shunt and series losses

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2151157A (en) * 1936-10-31 1939-03-21 Bell Telephone Labor Inc Guided electromagnetic wave transmission
US2207845A (en) * 1938-05-28 1940-07-16 Rca Corp Propagation of waves in a wave guide

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2151157A (en) * 1936-10-31 1939-03-21 Bell Telephone Labor Inc Guided electromagnetic wave transmission
US2207845A (en) * 1938-05-28 1940-07-16 Rca Corp Propagation of waves in a wave guide

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2796588A (en) * 1946-02-01 1957-06-18 Richard M Walker Compact waveguide attenuator
US2705780A (en) * 1946-11-02 1955-04-05 Polytechnie Inst Matched resistance film type wave guide attenuators
US2731603A (en) * 1946-11-02 1956-01-17 Polytechnic Inst Brooklyn Matched wave guide attenuators
US2760171A (en) * 1951-04-20 1956-08-21 Bell Telephone Labor Inc Wave-guide mode filter
US2705779A (en) * 1952-03-18 1955-04-05 Polytechnic Inst Attenuator units for waveguides
US2856589A (en) * 1954-04-20 1958-10-14 Rca Corp Light-controlled waveguide attenuator
US3080540A (en) * 1960-10-05 1963-03-05 Narda Microwave Corp Wave guide attenuator using shaped absorber of iron powder loaded resin to equalize shunt and series losses

Also Published As

Publication number Publication date
NL71519C (enrdf_load_stackoverflow)

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