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US3197718A - Gyromagnetic resonance waveguide isolator with ferrite strips and overlapping ferrite bar - Google Patents

Gyromagnetic resonance waveguide isolator with ferrite strips and overlapping ferrite bar Download PDF

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Publication number
US3197718A
US3197718A US215697A US21569762A US3197718A US 3197718 A US3197718 A US 3197718A US 215697 A US215697 A US 215697A US 21569762 A US21569762 A US 21569762A US 3197718 A US3197718 A US 3197718A
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US
United States
Prior art keywords
ferrite
waveguide
bar
magnetic field
gyromagnetic resonance
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
US215697A
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English (en)
Inventor
Sigrist Viktor
Muiler Martin
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.)
International Standard Electric Corp
Original Assignee
International Standard Electric Corp
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 International Standard Electric Corp filed Critical International Standard Electric Corp
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Publication of US3197718A publication Critical patent/US3197718A/en
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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
    • H01P1/32—Non-reciprocal transmission devices
    • H01P1/36—Isolators
    • H01P1/365—Resonance absorption isolators

Definitions

  • FIG. 1 Such a prior art gyromagnetic resonance uniline is shown in cross-section on FIG. 1.
  • ferrite bars 2 are arranged in the longi tudinal direction of the waveguide.
  • Both ferrite rods 2 show a ceramic cover 3.
  • Due to a symmetric and in-pair arrangement of the magnets 4 a homogeneous magnetic field exists around the ferrite rods which will be directly concentrated onto the environment of the ferrite rods in the waveguide by an efficient diminuation of the airgap of the four stripe-shaped intakes 5 of ferromagnetic material.
  • the magnets 4 are mounted to the two yokes 6.
  • the shieldings 7 on both sides of ferromagnetic material close the magnetic flux and simultaneously shield the entire arrangement against the outside.
  • the invention thereby assumes that the ferrite material used represents ice by itself an excellent non-ferromagnetic dielectric, if it is just sufficiently pre-magnetized below its gyromagnetic resonance and that an essentially smaller magneto-motive force is required to produce a certain magnetic field intensity at an arrangement of a determined air-gap length, if the magnetic field is heavily heterogeneous on the sample to be magnetized.
  • the invention is characterized in this, that only one ferrite bar is provided symmetrically to the waveguide axis, the bar being of such a width that both its edges protrude into the static magnetic field produced by two magnetic poles arranged on either side of the waveguide.
  • the waveguide is marked by 11 and the intendedly small intakes of ferromagnetic material by 15.
  • the two pairs of magnets 14 are interconnected by yokes 16, also of ferromagnetic material.
  • the magnetic flux of each pair of magnets is closed by the shieldings 17 so that the lines of flux are bunched together into the airgap limited by the intakes.
  • One single ferrite bar 12 in the waveguide centre is so wide that both its edges protrude into said airgap and are exposed there to a high magnetic field intensity corresponding to the gyromagnetic resonance desired.
  • the centre part of the ferrite bar on the other hand is only crossed by a few lines of flux, so it is pre-rnagnetized with a field intensity which does not come up to the field intensity required to obtain the gyromagnetic resonance.
  • the centre part of the ferrite bar possesses the effect of a non-ferromagnetic dielectric and performs the function of the dielectric cover of the individual ferrite bar marked by 3 in FIG. 1.
  • a waveguide isolator using gyromagnetic resonance to obtain isolation comprising waveguide means of rectangular cross section, means associated with said waveguide means for generating a static magnetic field, a plurality of ferrite stripes arranged symmetrically in broad side walls of said waveguide at fixed distances from the narrow side walls of said waveguide to reduce the reluctance of said waveguide to said static magnetic field, a ferrite bar mounted parallel to said waveguide axis between two of said stripes on at least one of the broad side walls of said waveguide, said ferrite bar being of sufficient width to overlap said ferrite stripes on each side of said ferrite bar.
  • said walled ferrite stripes comprise two stripes symmetrically arranged in each broad side wall extending parallel to the waveguide longitudinal axis and in juxaposition with static magnetic generating means.
  • said means for generating a static magnetic field comprises a pair of permanent magnets on each broad side wall and wherein said walled ferrite stripe means comprises ferrite stripes mounted over said permanent magnets to extend from the inner edge of said magnets toward the outer edge of said magnets.
  • said ferrite stripe means comprises a first ferrite stripe mounted on the bottom broad side wall and a second ferrite stripe symmetrically mounted on said top broad side wall.

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  • Gyroscopes (AREA)
  • Magnetic Ceramics (AREA)
  • Microwave Tubes (AREA)
US215697A 1961-08-08 1962-08-08 Gyromagnetic resonance waveguide isolator with ferrite strips and overlapping ferrite bar Expired - Lifetime US3197718A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEST18190A DE1138438B (de) 1961-08-08 1961-08-08 Resonanzeinwegleitung fuer sehr kurze elektromagnetische Wellen

Publications (1)

Publication Number Publication Date
US3197718A true US3197718A (en) 1965-07-27

Family

ID=7457754

Family Applications (1)

Application Number Title Priority Date Filing Date
US215697A Expired - Lifetime US3197718A (en) 1961-08-08 1962-08-08 Gyromagnetic resonance waveguide isolator with ferrite strips and overlapping ferrite bar

Country Status (6)

Country Link
US (1) US3197718A (es)
BE (1) BE621184A (es)
CH (1) CH402979A (es)
DE (1) DE1138438B (es)
GB (1) GB971019A (es)
NL (1) NL281890A (es)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3761924A (en) * 1972-09-14 1973-09-25 Us Army Isolimiter
FR2472280A1 (fr) * 1979-12-18 1981-06-26 Italtel Spa Dephaseur differentiel a ferrite pour puissance elevees
US4286135A (en) * 1979-10-09 1981-08-25 Raytheon Company Compact microwave isolator

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1299738B (de) * 1966-05-21 1969-07-24 Philips Patentverwaltung Mikrowellenzirkulator mit einer Hohlleiterserienverzweigung
DE1909936B1 (de) * 1969-02-27 1970-06-04 Philips Patentverwaltung Integriertes Mikrowellensystem mit einem Substrat aus nicht-magnetischem keramischem Material und Verfahren zur Herstellung derartiger Substrate

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3761924A (en) * 1972-09-14 1973-09-25 Us Army Isolimiter
US4286135A (en) * 1979-10-09 1981-08-25 Raytheon Company Compact microwave isolator
FR2472280A1 (fr) * 1979-12-18 1981-06-26 Italtel Spa Dephaseur differentiel a ferrite pour puissance elevees
US4353042A (en) * 1979-12-18 1982-10-05 Italtel S.P.A. Differential phase shifter for a waveguide carrying high-power microwaves

Also Published As

Publication number Publication date
CH402979A (de) 1965-11-30
NL281890A (es)
GB971019A (en) 1964-09-23
BE621184A (es)
DE1138438B (de) 1962-10-25

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