US3054075A - Anodised helical tape waveguide for modulating arrangements - Google Patents

Anodised helical tape waveguide for modulating arrangements Download PDF

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Publication number
US3054075A
US3054075A US25573A US2557360A US3054075A US 3054075 A US3054075 A US 3054075A US 25573 A US25573 A US 25573A US 2557360 A US2557360 A US 2557360A US 3054075 A US3054075 A US 3054075A
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US
United States
Prior art keywords
waveguide
guide
length
tape
modulating
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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
US25573A
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English (en)
Inventor
Lohoar John Ronald
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.)
Marconis Wireless Telegraph Co Ltd
BAE Systems Electronics Ltd
Original Assignee
Marconi Co Ltd
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Filing date
Publication date
Application filed by Marconi Co Ltd filed Critical Marconi Co Ltd
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Publication of US3054075A publication Critical patent/US3054075A/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/18—Phase-shifters
    • H01P1/19—Phase-shifters using a ferromagnetic device
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03C—MODULATION
    • H03C7/00—Modulating electromagnetic waves
    • H03C7/02—Modulating electromagnetic waves in transmission lines, waveguides, cavity resonators or radiation fields of antennas
    • H03C7/022—Modulating electromagnetic waves in transmission lines, waveguides, cavity resonators or radiation fields of antennas using ferromagnetic devices, e.g. ferrites

Definitions

  • This invention relates to wave energy modulating arrangements and more specifically to modulating arrangements of the kind in which very high frequency wave energy is modulated by propagating it along a waveguide in which is a ferrite or similar body and subjecting said body to a modulated or varied magnetic field produced by a coil system outside the guide.
  • the object of the invention is to provide improved, simple and efficient modulating arrangements of the kind referred to wherein, despite that the coil system is outside the waveguide, there is minimum losses due to the interposition of the walls of the guide in the path of the magnetic flux and minimum interference with the proper functioning of the waveguide as such.
  • an arrangement of the kind referred to for modulating very high frequency electromagnetic Wave energy comprises a length of waveguide constituted by a helically wound metallic tape with the edges of the turns substantially in physical contact with one another but insulated from one another, a ferrite body ICC Within said length of waveguide and a winding external to said length of waveguide and arranged and adapted to provide a varying magnetic field through said body to modulate, in accordance with the variations of said field, high frequency wave energy transmitted through said length of guide.
  • the tape is aluminium tape anodised to provide the insulation between the turns.
  • each end of the helically wound length with a cylindrical collar which is flat at one end and shaped with a step at the other to mate with the end of the helix proper, the tape of which is cut oif square to the length of the tape.
  • Another way is to solder together the last few turns of the helical guide to permit it to be turned off square, i.e. flat.
  • the outside of said length of guide is covered with a thickness of comparatively rigid insulating material, e.g. resin, and the winding is positioned on the outside of this insulating material.
  • the winding is a single layer winding of turns of conductive tape wound directly on the insulating material.
  • the ends of the length of waveguide may be fitted with flanges which must be so arranged that, when said length is inserted in a run of guide, it is insulated at least at one end from the adjacent guides. Accordingly, if a flange on the end of the helically wound length is to be in metal to metal contact with a flange at the end of an adjacent length of guide, the former flange should be insulated from the helix and a thin insulating shim is inserted to avoid contact between the end of the helix and the adjacent guide.
  • the invention is illustrated in the accompanying drawing which is a simplified sectional view of a preferred embodiment of the invention as applied to a frequency or phase modulator of microwave energy.
  • the invention is not limited to its use at any particular band of frequencies, it is very advantageous for phase or frequency modulation of microwave energy'at comparatively high frequencies and the illustrated embodiment is suitable for use for phase or frequency modulating microwave energy of a frequency of the order of 10,000 mc./s. by a modulating frequency of the order of l mc./ s.
  • Practical principal dimensions for the illustrated embodiment when intended for the frequencies stated are: about9 A2" overall length and about 0.81" for the inside diameter of the guide, the guide being wound from anodised aluminium tape about A of an inch wide and about of an inch thick.
  • a circularly sectioned guide 1 is made from anodised aluminium tape which is wound in helical form with the edges of the turns in contact with one another as indicated by the parallel lines 1 shown at the ends of the guide length. It will be understood that the distance between any two adjacent parallel lines 1 represents the width of the tape.
  • the anodising of the aluminium provides insulation so that although the tape edges are physically in contact with one another and the finished guide has no gaps or substantially no gaps leading to the exterior, the turns are effectively insulated each from the next.
  • the ends of the wound guide are finished off by flanges which serve for coupling the length of guide to other guide lengths (not shown). These flanges should be insulated from the guide proper and may be fitted thereto in any convenient manner.
  • the most practical way of making the glide consists in winding the tape on to a mandrel so .that no gaps occur in the winding; clamping it at the ends; and then, after trimming the ends if necessary, fitting the flanges in position with suitable insulation between them-and the guide proper. The clamps may then be removed and the mandrel punched out.
  • the waveguide with its end flanges, which are marked 2 is potted with resin or some other suitable insulating compound so that the guide is externally coated to provide it with additional mechanical: strength and rigidity by a comparatively thick layer of resin or other insulating compound 3.
  • the modulating magnetizing coil which is conventionally represented at 4 and may conveniently consist in practice of a few turns of copper tape wound directlyon to the insulation 3.
  • the coil 4 extends at least over the length of a ferrite insert which is shown as of conventional form at 5, i.e. it is a ferrite rod with pointed ends for avoiding sharp impedance discontinuities.
  • the ferrite rod 5 is supported in position in the guide by suitable insulating supports 6, preferably aper-tured as indicated.
  • a wave energy modulating arrangement in which very high frequency energy is modulated comprising a length of waveguide, a ferrite body located in said waveguide, a magnetic coil positioned outside said length of waveguide arranged and adapted to subject said body to a modulated magnetic field, said waveguide being of circular cross-section and comprising ahelically wound aluminium tape the turns of which are substantially in physical contact with one another, said tape being anodised to provide insulation between the turns whereby energy transmitted through said length of Waveguide is modulated by the varying magnetic field through said body.
  • each end of the helically wound length is fitted with a cylin drical collar which is flat at one end and shaped with a step at the other to mate with the end of the helix proper, the tape of which is cut oif square to the length of the tape.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Waveguide Aerials (AREA)
  • Soft Magnetic Materials (AREA)
US25573A 1959-08-19 1960-04-29 Anodised helical tape waveguide for modulating arrangements Expired - Lifetime US3054075A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB28335/59A GB869785A (en) 1959-08-19 1959-08-19 Improvements in or relating to microwave energy modulating arrangements

Publications (1)

Publication Number Publication Date
US3054075A true US3054075A (en) 1962-09-11

Family

ID=10274038

Family Applications (1)

Application Number Title Priority Date Filing Date
US25573A Expired - Lifetime US3054075A (en) 1959-08-19 1960-04-29 Anodised helical tape waveguide for modulating arrangements

Country Status (4)

Country Link
US (1) US3054075A (en, 2012)
ES (1) ES256829A1 (en, 2012)
GB (1) GB869785A (en, 2012)
NL (1) NL252828A (en, 2012)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150008993A1 (en) * 2013-07-03 2015-01-08 City University Of Hong Kong Waveguide coupler

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8820097D0 (en) * 1988-08-24 1988-09-28 Racal Mesl Ltd Radio signal polarising arrangements

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2802184A (en) * 1953-06-17 1957-08-06 Bell Telephone Labor Inc Non-reciprocal wave transmission
DE1031381B (de) * 1956-05-12 1958-06-04 Emi Ltd Einrichtung zum Einbringen eines durch eine Spule erzeugten Magnetfeldes in einen Hohlleiter

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2802184A (en) * 1953-06-17 1957-08-06 Bell Telephone Labor Inc Non-reciprocal wave transmission
DE1031381B (de) * 1956-05-12 1958-06-04 Emi Ltd Einrichtung zum Einbringen eines durch eine Spule erzeugten Magnetfeldes in einen Hohlleiter

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150008993A1 (en) * 2013-07-03 2015-01-08 City University Of Hong Kong Waveguide coupler
US9568675B2 (en) * 2013-07-03 2017-02-14 City University Of Hong Kong Waveguide coupler

Also Published As

Publication number Publication date
NL252828A (en, 2012)
GB869785A (en) 1961-06-07
ES256829A1 (es) 1960-07-01

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