EP0281712A1 - Circulateur haute fréquence - Google Patents

Circulateur haute fréquence Download PDF

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Publication number
EP0281712A1
EP0281712A1 EP87310880A EP87310880A EP0281712A1 EP 0281712 A1 EP0281712 A1 EP 0281712A1 EP 87310880 A EP87310880 A EP 87310880A EP 87310880 A EP87310880 A EP 87310880A EP 0281712 A1 EP0281712 A1 EP 0281712A1
Authority
EP
European Patent Office
Prior art keywords
ferrite
circulator
waveguide
ports
sleeve
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.)
Withdrawn
Application number
EP87310880A
Other languages
German (de)
English (en)
Inventor
Ann Catherine Gravina
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.)
Marconi Electronic Devices Ltd
Original Assignee
Marconi Electronic Devices Ltd
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 Marconi Electronic Devices Ltd filed Critical Marconi Electronic Devices Ltd
Publication of EP0281712A1 publication Critical patent/EP0281712A1/fr
Withdrawn legal-status Critical Current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
    • H01P1/32—Non-reciprocal transmission devices
    • H01P1/38—Circulators
    • H01P1/383—Junction circulators, e.g. Y-circulators
    • H01P1/39—Hollow waveguide circulators

Definitions

  • This invention relates to a high frequency circulator in which three signal ports angularly offset by 120° from each other are linked at a common point at which a ferrite body is present in order that an electromagnetic wave input at one port is output at a different predetermined port.
  • An external magnetic field is applied to the circulator such that the field is aligned with the axis of the ferrite body and when all the ferrite junction and magnetic parameters are correctly adjusted for a given frequency, a signal entering at a first port is transmitted to a second port whilst the third port is isolated.
  • a signal entering at the second port is transmitted to the third port whilst the first port is isolated, and finally a signal entering at the third port is transmitted to the first port with the second port being isolated.
  • Such devices are conveniently used for separating or combining electromagnetic high frequency signals.
  • a high frequency circulator includes a ferrite body located at the junction point of three equally angularly spaced waveguide ports which are capable of supporting propagation of an electromagnetic wave, the ferrite body being in the form of a cylinder which is closely surrounded by dielectric material, the outer surface of which engages with three wall regions, each wall region being associated with respective pairs of ports, the ferrite body being thereby located centrally with respect to the three ports.
  • the ferrite body can be very accurately located by the dielectric material thereby overcoming the aforementioned problem. Furthermore, rather than adversely affecting the performance of the circulator it has been found that the dielectric material can serve to match the impedance of the ferrite body to the waveguide.
  • the dielectric material is preferably in the form of a preformed sleeve or tube which is placed around the cylindrical ferrite body.
  • the electric vector of the electromagnetic energy is in the direction of the short wall of a rectangular waveguide channel.
  • the invention is particularly suitable for use with an E-plane circulator: that is to say, a circulator in which the direction of the electric vector in the waveguide is normal to the axis of the ferrite cylinder.
  • the ferrite body is preferably of shorter length than the height of each port.
  • two short ferrite rod portions which are axially aligned with each other are placed in short dielectric tubes which are each then attached to opposite faces of the waveguides.
  • a common dielectric tube can be used to locate the two ferrite rod portions.
  • the thickness of the wall of the dielectric tube is chosen so as to bridge the space between ferrite rod and the junction points of each pair or ports so as to firmly and securely locate the ferrite rods in their required position of symmetry.
  • the length and diameter of the ferrite material, and of course the lengths of the dielectric can then be adjusted so as to give the correct electrical and magnetic properties.
  • FIG 1 there is shown therein a sectional view through the central plane of an E-plane circulator.
  • the axis of symmetry of the ferrite is shown in the direction of the arrow 1 shown in Figure 2 and this is aligned with the maximum dimension of a rectangular waveguide channel 2.
  • An external field is applied to the ferrite and the direction of the field is aligned with the arrow 1.
  • the polarity of the external field determines the direction of circulation of the electromagnetic energy.
  • such a waveguide channel 2 is machined from a pair of conductive metallic blocks 3 and 4, the two blocks mating together exactly so as to constitute the required waveguide structure.
  • each junction region is in the form of just a line contact with sleeve 16, this need not always be so, and will depend on the geometry of the structure.
  • FIG 3 One possible configuration of the ferrite body 15 and the dielectric tube is illustrated in Figure 3, in which two relatively thick walled dielectric tubes 20 and 21 surround separate short ferrite rods 22 and 23. Although the tubes do not fit tightly on the rods, they are a close fit so that there is negligible clearance between them. Similarly the outer surfaces of the tubes 20 and 21 co-­operate with the contact points 17, 18, 19 so that the rods 22 and 23 are aligned with each other and are retained precisely at the centre of the waveguide portion. The rods and tubes are retained firmly in contact with the walls 24 of the waveguide by means of a low loss adhesive such as one known as Silastic RTV.
  • Silastic RTV a low loss adhesive
  • the tubes 20 and 21 together with the length and diameter of the ferrite rods 22 and 23 enable the bandwidth of operation of the cirulator to be tailored to particular requirements, and they permit the assembly to be quickly and accurately lcoated without the need for setting jigs, machined locating recesses, or the use of a microscope.
  • the rods 22, 23 are made from a material known as L3 Lithium Titanium Zinc Iron Spinel, available from Marconi Electronic Devices Limited, although other materials are suitable. Impedance matching is provided by the sleeve or tubes 20,21 each having an external diameter of 4.95mm, made from "Rexolite 1422", a dielectric made by Oak Materials Group Inc, USA. The dimensions of the E-plane waveguide channel are 10.67 x 4.32mm approximately.
  • Figure 4 shows an alternative embodiment in which the ferrite rods 25, 26, are located by a common sleeve or tube 27 of dielectric material.

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  • Non-Reversible Transmitting Devices (AREA)
EP87310880A 1987-02-12 1987-12-10 Circulateur haute fréquence Withdrawn EP0281712A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8703207A GB2201044B (en) 1987-02-12 1987-02-12 High frequency circulator
GB8703207 1987-02-12

Publications (1)

Publication Number Publication Date
EP0281712A1 true EP0281712A1 (fr) 1988-09-14

Family

ID=10612163

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87310880A Withdrawn EP0281712A1 (fr) 1987-02-12 1987-12-10 Circulateur haute fréquence

Country Status (2)

Country Link
EP (1) EP0281712A1 (fr)
GB (1) GB2201044B (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19802070A1 (de) * 1998-01-21 1999-07-29 Bosch Gmbh Robert E-Ebenen Hohlleiter-Zirkulator
CN113258237B (zh) * 2021-03-30 2022-09-20 武汉凡谷电子技术股份有限公司 介质波导环形器以及隔离器

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB963414A (en) * 1962-08-23 1964-07-08 Mullard Ltd Waveguide circulator
DE3127445A1 (de) * 1981-07-11 1982-04-01 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Millimeterwellen-zirkulator

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3248662A (en) * 1962-04-18 1966-04-26 Bendix Corp Microwave amplifier

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB963414A (en) * 1962-08-23 1964-07-08 Mullard Ltd Waveguide circulator
DE3127445A1 (de) * 1981-07-11 1982-04-01 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Millimeterwellen-zirkulator

Also Published As

Publication number Publication date
GB2201044B (en) 1991-03-20
GB2201044A (en) 1988-08-17
GB8703207D0 (en) 1987-03-18

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