EP0343887A1 - Wellenleitervorrichtung - Google Patents

Wellenleitervorrichtung Download PDF

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Publication number
EP0343887A1
EP0343887A1 EP89305128A EP89305128A EP0343887A1 EP 0343887 A1 EP0343887 A1 EP 0343887A1 EP 89305128 A EP89305128 A EP 89305128A EP 89305128 A EP89305128 A EP 89305128A EP 0343887 A1 EP0343887 A1 EP 0343887A1
Authority
EP
European Patent Office
Prior art keywords
mode
signal
waveguide
signals
magic
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Withdrawn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
EP89305128A
Other languages
English (en)
French (fr)
Inventor
Murray James Todd
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.)
General Electric Co PLC
Original Assignee
General Electric Co PLC
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 General Electric Co PLC filed Critical General Electric Co PLC
Publication of EP0343887A1 publication Critical patent/EP0343887A1/de
Withdrawn legal-status Critical Current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
    • H01P1/16—Auxiliary devices for mode selection, e.g. mode suppression or mode promotion; for mode conversion
    • H01P1/163—Auxiliary devices for mode selection, e.g. mode suppression or mode promotion; for mode conversion specifically adapted for selection or promotion of the TE01 circular-electric mode
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/06—Movable joints, e.g. rotating joints
    • H01P1/062—Movable joints, e.g. rotating joints the relative movement being a rotation
    • H01P1/066—Movable joints, e.g. rotating joints the relative movement being a rotation with an unlimited angle of rotation
    • H01P1/067—Movable joints, e.g. rotating joints the relative movement being a rotation with an unlimited angle of rotation the energy being transmitted in only one line located on the axis of rotation

Definitions

  • This invention relates to waveguide apparatus and more particularly, but not exclusively, to apparatus for transforming signals between the TE10 mode and the TE01 mode.
  • the energy is often transmitted along a circular waveguide in the TE01 mode.
  • the TE01 mode which is illustrated in Figure 1, is one in which the electric field lines are circumferential and thus power losses tend to be small because they do not intercept the walls of the waveguide.
  • the energy to be transmitted along the waveguide is normally generated in the TE10 mode, as shown in Figure 2, which exists in rectangular waveguides and in which the electric field lines are generally parallel to the short sides of the waveguide.
  • a transition section must be included to convert signals from the TE10 mode into the TE01 mode and consists of a tapered section in which the cross-section of the waveguide gradually changes from the rectangular shape to a circular section.
  • the transition section must be relatively long in order to obtain a final signal having good mode purity, being typically of the order of one metre for signal frequencies of 6Ghz.
  • the present invention arose from an attempt to provide a more compact waveguide apparatus for transforming signals between the TE10 and TE01 modes.
  • waveguide apparatus for transforming signals between the TE10 mode and a circular waveguide mode comprising a Magic-T having its output ports arranged adjacent to one another and means for transmitting a signal via its E-­plane port and signals via its output port, such that a signal in the TE10 mode applied to the E-plane port results in signals at the outputs which form a signal in the TE20 mode, and means for using the signal in the TE20 mode alone to produce the circular waveguide mode.
  • the circular mode can be produced from a signal in the TE10 mode using a relatively small transition section which may be, for example, of the order of five times shorter than a conventional transition section.
  • the circular mode is the TE01 mode.
  • the input to a Magic-T is applied via its H-plane port and the E-plane port is connected to a load for matching purposes.
  • the signals at the two outputs of the Magic-T are in the TE10 mode in opposite senses.
  • the two, opposite TE10 modes combine to form a TE20 mode, as shown in Figure 3, where the reference 1 indicates one of the Magic-T outputs and reference 2 the other.
  • the production of the TE20 mode is an intermediate point in the eventual transformation of the signal into the TE01 mode or other circular mode.
  • Apparatus in accordance with the invention may thus be made less bulky than conventional transition sections, which makes it particularly advantageous for arrangements in which the waveguide is required to move, for example in a rotating joint.
  • the Magic-T is a symmetrical device such that in apparatus in accordance with the invention, when a signal in the TE20 mode is applied to the outputs of the Magic-T, a signal is derived from the E-plane port which is in the TE10 mode.
  • the waveguide apparatus may act to transform signals from the TE10 mode into the TE01 mode and vice-versa.
  • apparatus in accordance with the invention may tend to have reduced bandwidth capability and mode purity compared to a conventional transition section, it has good matching characteristics and offers sufficiently good performance for its use to be advantageous in a number of applications.
  • a taper section which has an aperture therethrough, the transverse section of which is substantially rectangular at one end and substantially cruciform at its other end, the taper section being arranged such that signals from the Magic-T outputs are applied to the rectangular section part of the aperture.
  • a taper section is included having an aperture therethrough, the transverse section of the aperture being substantially rectangular at one end of the taper section and, at its other end, having two substantially concave sides which are joined by four substantially straight sides, the width of the aperture being larger at the concave sides than at its centre, the taper section being arranged such that signals from the Magic-T outputs are applied to the part of the aperture having rectangular section.
  • an iris is included, the iris having a cruciform aperture therein via which signals from and to the Magic-T outputs are arranged to pass.
  • the cruciform aperture is preferably arranged to overlap the non-rectangular end of the taper section. Again, the non-rectangular end of the taper section and the iris are also of use in transforming a signal in the TE01 mode to the TE10 mode.
  • a waveguide rotating joint is included which is capable of transmitting two signals across the joint in respective different waveguide modes.
  • the size of waveguide apparatus can therefore be reduced which is particularly important for example, in applications such as satellite communication equipment and in radar apparatus.
  • the waveguide modes chosen must be such that there is little or no coupling between them.
  • the two signals are at respective different frequencies. These frequencies might be, for example, 4 GHz and 6 GHz which are typical frequency bands for satellite communication down and up paths. By using widely spaced frequency bands for the two signals, any coupling between them tends to be further reduced.
  • the waveguide at the joint is circular, and that one mode is the TM01 mode and the other is the TE01 mode.
  • the electric field lines of the two modes are orthogonal and there is substantially no coupling between them.
  • Another advantage in employing these two modes is that there is only a very small electric field along the longitudinal axis in the TE01 modes so that, for example, a cable may be positioned along it.
  • apparatus in accordance with the invention includes two circular waveguide sections 3 and 4 which are relatively rotatable at a rotating joint 5 about axis X-X.
  • Two ports 6 and 7 are included for transmission of microwave energy across the rotating joint 5 in the TM01 waveguide mode, which has radial electrical field lines as shown in Figure 6.
  • Power in the TE01 mode can also be transmitted across the rotating joint 5 via ports 8 and 9, between which the TM01 ports 6 and 7 are located.
  • the frequency of the TE01 mode signal is different from that of the TM01 mode signal.
  • TE01 port 8 is the E-plane input port of a Magic-T 10, the H-plane input port having a termination 11.
  • the two output ports 12 and 13 of the Magic-T 10 are arranged adjacent one another. Microwave energy applied in the TE10 mode to the port 8 reaches one of the outputs 12 in the TE10 mode, as illustrated by the arrows, and the other output port 13 in the TE10 mode in the opposite sense.
  • the output of the Magic-T is effectively in the TE20 mode.
  • the output of the Magic-T 10 is applied to a short taper 14 which has a rectangular section aperture on the side adjacent output ports 12 and 13 which opens out into a substantially cruciform section aperture at its other face.
  • a mode is set up at the cruciform aperture face of the taper 14 as illustrated by the arrows.
  • Signals passed via the Magic-T outputs 12 and 13 and the taper 14 are then applied via a spacer 15 to an iris 16 having a cruciform aperture 17 therein. This sets up a mode at the iris 16 as illustrated by the arrows.
  • the iris 16 is the last stage in the transition section 18 which produces the TE01 mode in the circular waveguide at the joint 5.
  • a similar transition section 19 is included on the other side of the rotating joint 5 and includes the port 9, which again is the E-plane port of a Magic-T.
  • the taper 14, or iris 16 where this is included, is arranged to present a short circuit at 20 (as shown in Figure 5) to energy passing through ports 6 and 7 so as to inhibit the undesirable TE11 mode.
  • Figure 8 shows another short taper 21 which may be used instead of the taper 14 shown in Figure 7.
  • the taper 21 has a rectangular aperture 22 in one face which opens out into and aperture 23 having two curved sides and four straight side between them, as shown. This configuration give particularly good mode purity.

Landscapes

  • Waveguide Switches, Polarizers, And Phase Shifters (AREA)
  • Waveguide Connection Structure (AREA)
EP89305128A 1988-05-21 1989-05-19 Wellenleitervorrichtung Withdrawn EP0343887A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8812091 1988-05-21
GB888812091A GB8812091D0 (en) 1988-05-21 1988-05-21 Waveguide apparatus

Publications (1)

Publication Number Publication Date
EP0343887A1 true EP0343887A1 (de) 1989-11-29

Family

ID=10637333

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89305128A Withdrawn EP0343887A1 (de) 1988-05-21 1989-05-19 Wellenleitervorrichtung

Country Status (2)

Country Link
EP (1) EP0343887A1 (de)
GB (2) GB8812091D0 (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010076016A1 (de) * 2008-12-30 2010-07-08 Dr. Nathrath, Trümper, Partnerschaft Ingenieure Mikrowellen-drehkupplung für rechteckhohlleiter
CN101789535A (zh) * 2010-03-10 2010-07-28 北京纳诺帕技术中心 一种单模圆柱微波腔
CN106992337A (zh) * 2017-04-19 2017-07-28 桂林电子科技大学 一种Ka波段圆波导TE01模式激励器
RU2626726C1 (ru) * 2016-07-12 2017-07-31 Акционерное общество "Концерн воздушно-космической обороны "Алмаз-Антей"(АО "Концерн ВКО "Алмаз-Антей") Компактная 90-градусная скрутка в прямоугольном волноводе
GB2593159A (en) * 2020-03-12 2021-09-22 Univ Lancaster Method and apparatus for supplying electromagnetic power to a plasma vessel

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2455158A (en) * 1944-08-15 1948-11-30 Philco Corp Wave guide coupling device
US2656513A (en) * 1949-12-29 1953-10-20 Bell Telephone Labor Inc Wave guide transducer
US2825031A (en) * 1951-12-15 1958-02-25 Alford Andrew Method of converting modes of wave motion for transmission from rectangular to circular wave guides
FR1239182A (fr) * 1958-10-30 1960-08-19 Thomson Houston Comp Francaise Changeur de mode fonctionnant en hyperfréquence
US3100881A (en) * 1960-10-19 1963-08-13 Gen Electric Waveguide system having mode converter for changing rectangular te10 mode into circular te01 at locus of waveguide window
US3230484A (en) * 1963-10-22 1966-01-18 Lipetz Nathan Waveguide transition between rectangular and circular waveguides
DE1933950A1 (de) * 1968-07-05 1970-01-15 Thomson Csf Anordnung zum Erregen einer Schwingungsform H20 in einem rechteckigen Hohlleiter sowie diese Anordnung enthaltende Monoplusquelle
US3633130A (en) * 1970-07-15 1972-01-04 Hughes Aircraft Co Multichannel rotary joint supportive of energy in at least three mutually orthogonal circularly symmetric waveguide modes simultaneously
EP0243888A1 (de) * 1986-04-28 1987-11-04 Alcatel Espace Mikrowellen-Drehkopplungsvorrichtung
EP0210543B1 (de) * 1985-08-02 1994-03-02 Texas Instruments Incorporated Radardrehkopplung

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2455158A (en) * 1944-08-15 1948-11-30 Philco Corp Wave guide coupling device
US2656513A (en) * 1949-12-29 1953-10-20 Bell Telephone Labor Inc Wave guide transducer
US2825031A (en) * 1951-12-15 1958-02-25 Alford Andrew Method of converting modes of wave motion for transmission from rectangular to circular wave guides
FR1239182A (fr) * 1958-10-30 1960-08-19 Thomson Houston Comp Francaise Changeur de mode fonctionnant en hyperfréquence
US3100881A (en) * 1960-10-19 1963-08-13 Gen Electric Waveguide system having mode converter for changing rectangular te10 mode into circular te01 at locus of waveguide window
US3230484A (en) * 1963-10-22 1966-01-18 Lipetz Nathan Waveguide transition between rectangular and circular waveguides
DE1933950A1 (de) * 1968-07-05 1970-01-15 Thomson Csf Anordnung zum Erregen einer Schwingungsform H20 in einem rechteckigen Hohlleiter sowie diese Anordnung enthaltende Monoplusquelle
US3633130A (en) * 1970-07-15 1972-01-04 Hughes Aircraft Co Multichannel rotary joint supportive of energy in at least three mutually orthogonal circularly symmetric waveguide modes simultaneously
EP0210543B1 (de) * 1985-08-02 1994-03-02 Texas Instruments Incorporated Radardrehkopplung
EP0243888A1 (de) * 1986-04-28 1987-11-04 Alcatel Espace Mikrowellen-Drehkopplungsvorrichtung

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010076016A1 (de) * 2008-12-30 2010-07-08 Dr. Nathrath, Trümper, Partnerschaft Ingenieure Mikrowellen-drehkupplung für rechteckhohlleiter
CN101789535A (zh) * 2010-03-10 2010-07-28 北京纳诺帕技术中心 一种单模圆柱微波腔
RU2626726C1 (ru) * 2016-07-12 2017-07-31 Акционерное общество "Концерн воздушно-космической обороны "Алмаз-Антей"(АО "Концерн ВКО "Алмаз-Антей") Компактная 90-градусная скрутка в прямоугольном волноводе
CN106992337A (zh) * 2017-04-19 2017-07-28 桂林电子科技大学 一种Ka波段圆波导TE01模式激励器
GB2593159A (en) * 2020-03-12 2021-09-22 Univ Lancaster Method and apparatus for supplying electromagnetic power to a plasma vessel

Also Published As

Publication number Publication date
GB2218855A (en) 1989-11-22
GB8812091D0 (en) 1988-06-22
GB8911532D0 (en) 1989-07-05
GB2218855B (en) 1992-05-27

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