EP0093058B1 - Mikrowellen-Speisevorrichtung für rotationssymmetrischen Doppelbanderreger mit Rillen - Google Patents

Mikrowellen-Speisevorrichtung für rotationssymmetrischen Doppelbanderreger mit Rillen Download PDF

Info

Publication number
EP0093058B1
EP0093058B1 EP83400808A EP83400808A EP0093058B1 EP 0093058 B1 EP0093058 B1 EP 0093058B1 EP 83400808 A EP83400808 A EP 83400808A EP 83400808 A EP83400808 A EP 83400808A EP 0093058 B1 EP0093058 B1 EP 0093058B1
Authority
EP
European Patent Office
Prior art keywords
source
exciting means
corrugated
grooved
axis
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
Application number
EP83400808A
Other languages
English (en)
French (fr)
Other versions
EP0093058A1 (de
Inventor
Jean-Claude Durand
Jean Bouko
Jean Le Foll
François Salvat
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.)
Thales SA
Original Assignee
Thomson CSF SA
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 Thomson CSF SA filed Critical Thomson CSF SA
Publication of EP0093058A1 publication Critical patent/EP0093058A1/de
Application granted granted Critical
Publication of EP0093058B1 publication Critical patent/EP0093058B1/de
Expired legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
    • H01Q15/0006—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices
    • H01Q15/0013—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices said selective devices working as frequency-selective reflecting surfaces, e.g. FSS, dichroic plates, surfaces being partly transmissive and reflective
    • H01Q15/0033—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices said selective devices working as frequency-selective reflecting surfaces, e.g. FSS, dichroic plates, surfaces being partly transmissive and reflective used for beam splitting or combining, e.g. acting as a quasi-optical multiplexer

Definitions

  • the present invention relates to a device for exciting a grooved microwave source of revolution, otherwise called corrugated, operating in two distant frequency bands.
  • These grooved sources with distant bands for example X and KU or KA of central frequencies 9, 17 and 35 GHz. are used particularly advantageously in dual-band radar systems for which the narrow beam of the high-band radiation pattern is used for tracking low-site targets.
  • Patent FR-A-2067094 describes a device for excitation of a microwave source operating in two distant frequency bands. Said device is mechanically decoupled from said source. However, said source is not grooved.
  • grooved or corrugated source is meant a waveguide, generally with a constant or increasing circular section, which has transverse grooves of determined depth and which are spaced from each other by a distance d o . also called the grooved source period.
  • bi-periodic grooved sources having two types of alternating grooves.
  • the radiation diagrams of the corrugated sources have the same properties, having in particular the advantage of having weak lateral lobes since the electromagnetic field is canceled out on the edges of the sources and an equality of the diagrams in the E and H planes.
  • these hybrid equilibrium points are very specific operating points of a grooved guide, the set of all the operating points constituting the dispersion curves of the guide which represent the different hybrid propagation modes.
  • These hybrid modes already defined above respond, in order to exist in a guide, to certain boundary conditions, that is to say at the level of the internal wall of the guide, in particular to this one: the electrical components E ⁇ p and magnetic H ⁇ p located in a cross section of the guide and perpendicular to its radius, are equal to zero.
  • H ⁇ p and magnetic H ⁇ p located in a cross section of the guide and perpendicular to its radius
  • FIG. 1 is an example of dispersion curves of a simple grooved source, comprising only one type of grooves. These dispersion curves represent the propagation constant B of the wave propagating in the grooved guide as a function of the propagation constant k of the wave in vacuum or free space.
  • the curve C 1 represents the hybrid mode EH "
  • the curve C 2 the hybrid mode HE 11 which each have a hybrid equilibrium point, referenced respectively P, and P 2.
  • the band operating bandwidth is less than an octave
  • the frequency of the curves is 2 ⁇ / d, d being the period of the grooves in the guide.
  • FIG. 2 represents the dispersion curves of a bi-periodic grooved source, operating in two different frequency bands, distant from each other (X and KU).
  • the alternation of two series of grooves makes it possible to couple the modes of the simple grooved sources together. This alternation favors the appearance of hybrid equilibria.
  • the dispersion curves C 3 . C 4 and C 5 corresponding to the lowest operating band have a period 2 ⁇ / of approximately twice as small as that of the dispersion curves C, and C 2 corresponding to the same operating band for a simple grooved guide, whose repetition period d
  • the currently known excitation devices for these grooved sources consist of a smooth circular guide opening directly into the mouth of these sources.
  • the dimensions of this excitation guide must be small enough so that only the fundamental mode TE 11 propagates, the electric field lines of which, in a cross section of the guide, shown in FIG. 3b are the closest to those of the hybrid mode propagating in a grooved source, the hybrid mode HE 11 for example, represented in FIG. 3a.
  • these lines are almost rectilinear and parallel to each other at the center of the guide, but curve towards the edges.
  • This curvature of the field lines shows that the adaptation between the smooth excitation guide and the grooved guide is not perfect.
  • the first grooves of the corrugated guides are more or less empirically given values different from those assigned by the theory of grooved structures.
  • this excitation device by means of a smooth guide only excites the hybrid mode HE 11 , all the other possible modes being evanescent at the nominal frequency.
  • a source when a source must operate simultaneously in two distant frequency bands with hybrid modes, the assembly produced, represented for example in FIG. 4, is very bulky.
  • a source consists of two monoband grooved sources 40 and 41. each excited according to a known method, a smooth guide for example 42 and 43.
  • the source 40 radiating in the lowest frequency band has larger dimensions than the other, 41. They are placed so that their respective axes A o and A, of propagation are perpendicular.
  • Such a dual-band source is bulky and expensive.
  • the subject of the present invention is the production of a device for excitation of a grooved microwave source operating in two distant frequency bands free from the drawbacks of the prior art which have just been mentioned, electrical and mechanical drawbacks.
  • an excitation device for a grooved microwave frequency source operating in two distant frequency bands, is characterized in that it is mechanically decoupled from said source.
  • the object of the invention is, from the electrical point of view, to no longer subject the electric field, during its passage from the excitation device to the grooved source itself, to the boundary conditions on the internal wall of the guide - in particular with the orthogonality of the field E - on the internal walls of the guide.
  • Figure 3b which is a section of a smooth guide along a cross section, the field lines curve on the inner edge of the guide so that, if the excitation device is a smooth guide , the field lines thus generate the unwanted parasitic modes in the grooved source.
  • the grooved dual-band source is excited in free space, that is to say by means mechanically decoupled from said source. By this mechanical decoupling between the excitation device and the grooved source.
  • the latter is excited by radiation in the near zone, called the Rayleigh zone, for which the energy emitted by the excitation device remains channeled without dispersing effect.
  • the excitation device is a circular guide of diameter D and if the operating wavelength is ⁇ ; the Rayleigh zone, defined at the outlet of the guide along the axis of propagation of the latter, has a limit length equal to D 2 / 2x.
  • FIG. 5 represents an exemplary embodiment of the invention, seen in longitudinal section.
  • the source 1 grooved microwave operating in two frequency bands is constituted by a horn of revolution, grooved, excited by two means mechanically decoupled from said source and respective axes of propagation ⁇ and 1 'perpendicular.
  • the horn 1 has two series of alternating grooves 2 and 3 on its internal wall. These grooves are repeated according to a period D '.
  • the low band excitation means of the grooved source 1 is constituted by a smooth guide 5 of circular cross section, placed at a distance d from the mouth 4 of the source 1, less than the limit of the Rayleigh zone of the guide.
  • the axis of propagation of this guide is coincident with that ⁇ 'of the grooved source 1.
  • This guide radiates according to TE 11 mode, for example, whose configuration of the electromagnetic field is closest to that of the hybrid mode useful in band low.
  • the means of excitation in high band is, in the case shown, a corrugated horn 6, radiating in a mode close to the hybrid mode in high band. It is placed so that its axis of propagation ⁇ "is perpendicular to the axis of the guide 5, at a distance d 'from the latter less than the limit of the Rayleigh zone of this horn 6.
  • a spatial frequency filter 7 is placed between them and the grooved source 1, at 45 ° from the axes to and ⁇ '.
  • the low band wave passes through this filter 7 to excite the mouth 4 of the dual band source 1 and the high band wave undergoes a reflection of 90 ° on this filter to in turn excite the source 1.
  • This spatial frequency filter makes it possible to combine in a single beam of electromagnetic waves at least two beams of different frequencies from two separate sources.
  • Figure 5 is only a non-limiting example of embodiment of the invention.
  • the two excitation means can be smooth guides, or grooved guides and have a straight or rectangular section.
  • the low band excitation means is not necessarily in the axis of the mouth of the grooved source, and may be perpendicular thereto. If this means is more readily placed in the axis of the source, it is for reasons of space, since it generally has larger dimensions than the excitation means in high band. This therefore makes it possible to use a smaller spatial filter.
  • This spatial filter 7 which separates electromagnetic waves of determined average angle of incidence and located in different frequency bands, can be of multi-layer dielectric or a simple polarizing network with parallel wires if the two excitation means emit waves with orthogonal rectilinear polarizations. More elaborate arrangements are possible, in particular periscope, when the grooved source itself has to rotate. However, in all cases of implementation of the invention, the distances d and d '. at the output of the excitation means of the grooved source, are chosen so as to obtain an optimal coupling between them and the grooved source, that is to say so that the energy emitted by the two means of excitation is transmitted as completely as possible to the mouth of the grooved source.
  • the bandwidth of such a bi-periodic source is one octave, as for a simple grooved source.
  • the advantages of the invention are as follows. First of all from the electrical point of view, the problems of exponential transition between smooth excitation guide and grooved guide are eliminated since it is no longer necessary to adjust the first grooves, the excitation field lines entering the guide grooved in the best conditions of geometric configuration and coupling. In addition, since there is no longer any problem of transition between guides, it is advantageous to use guides with rectangular cross section, inside which their fundamental mode TE, o is propagated, whose rectilinear field lines are suitable. well to the excitement of a corrected source, thus bringing a clear improvement. Then from the mechanical point of view, the invention allows a simplification of implementation since the contour of the excitation guide is independent of that of the mouth of the grooved source.
  • rectangular guides with a flared opening can be used, thus becoming sectoral horns.
  • the wave impedance corresponds better to that of the grooved guide and correspondingly the Rayleigh zone is enlarged thereby allowing better exploitation of the principle.
  • the dual-band source of the invention has a smaller overall size than the dual-band source of the prior art, since this inventive source has approximately the same dimensions as the low band source of the prior art.
  • FIGS. 6 and 7 show the notable improvement brought by the excitation device, object of the invention.
  • the diagrams in these two figures relate to a corrugated source with distant bands (X and KU) constituted by a guide with alternating grooves of diameter 52.5 mm (2.9 x in KU).
  • the excitation device is a smooth guide with circular section of the same section as the grooved guide, comprising strips on its internal wall to correct the field lines.
  • Figure 6 we see the poor quality of the electrical and magnetic diagrams when the excitation device - the smooth guide - is attached to the grooved source according to known art. Parasitic modes combine with the useful mode and cause great disproportions between the E and H planes.
  • FIG. 7 relates to the excitation in free space, according to the invention, the smooth guide being distant 62 mm from the grooved source.
  • the diagrams represented almost merge with those theoretical of the hybrid useful mode, the divergences being explained by the residual presence of parasitic modes which an excitation by a guide with rectangular section would easily eliminate.

Landscapes

  • Waveguide Aerials (AREA)
  • Waveguide Connection Structure (AREA)

Claims (8)

1. Vorrichtung zum Erregen eiuer gerillten rotationssymmetrische Mikrowellenquelle (1), die in zwei voneinander entfernten Frequenzbändern mit einem Bandmittenfrequenzverhältnis größer oder gleich zwei arbeitet und mechanisch von der Quelle (1) entkoppelt ist. dadurch gekennzeichnet, daß die Position der Vorrichtung in Bezug auf die Quelle den hybriden Abgleich in der Quelle herbeizuführen gestattet.
2. Erregervorrichtung nach Anspruch 1, dadurch gekennzeichnet daß sie zwei Erregermittel (5 und 6) zum Erregen der Quelle (1), denen je ein Betriebsfrequenzband mit Ausbreitungsachsen (Δ und Δ") zugeordnet ist, die mit der Achse (Δ) der gerillten Quelle (1) zusammenfallen, bzw. senkrecht dazu verlaufen, und ein räumliches Frequenzfiltermittel (7) besitzt, welches für die vom Erregermittel mit der Ausbreitungsachse (Δ") senkrecht zur Achse (Δ') der gerillten Quelle abgestrahlten Wellen reflektierend wirkt und für die vom Erregermittel mit der Ausbreitungsachse (A') der gerillten Quelle (1) transparent ist, und im Schnittpunkt dieserbeiden Achsen (A und Δ") entlang einer ihrer Winkelhalbierenden angeordnet ist, wobei die beiden Erregermittel (5 und 6) von der Quelle (1) mechanisch entkoppelt sind, derart, daß die von ihnen gegen die Mündung (4) der Quelle (1) abgestrahlten Wellen innerhalb der Rayleigh'schen Zone jedes der Erregermittel kanalisiert bleiben und daß letztere außerdem eine optimale Kopplung mit der Quelle (1) bilden.
3. Erregervorrichtung nach Anspruch 2, dadurch gekennzeichnet, daß die Erregermittel (5 und 6) vom Wellenleiter- oder Hornstrahlertyp sind und glatte oder gewellte innere Oberflächen besitzen.
4. Erregervorrichtung nach Anspruch 1, 2 oder 3, dadurch gekennzeichnet, daß die Erregermittel (5 und 6) vom Wellenleiter- oder Hornstrahlertyp sind und kreisförmigen oder rechteckigen Querschnitt aufweisen.
5. Erregervorrichtung nach Anspruch 2, dadurch gekennzeichnet, daß die Ausbreitungsachsen (Δ und Δ") der Erregermittel (5 und 6), welche jeweils im untersten und obersten Frequenzband arbeiten, mit der Ausbreitungsachse (Δ') der Quelle zusammenfallen bzw. zu ihr senkrecht verlaufen.
6. Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, daß das räumliche Frequenzfiltermittel (7) die vom Erregermittel (5) im unteren Frequenzband abgestrahlte Welle durchläßt und die vom Erregermittel (6) im oberen Frequenzband abgestrahlte Welle um 90° ablenkt.
7. Erregervorrichtung nach Anspruch 2, dadurch gekennzeichnet, daß die Erregermittel (5 und 6), welche jeweils im obersten und untersten Frequenzband arbeiten, Ausbreitungsachsen (Δ und Δ") besitzen, die senkrecht zur Ausbreitungsachse (A') der Quelle (1) verlaufen bzw. zusammenfallen.
8. Radarsystem, das in zwei voneinander entfernten Frequenzbändern arbeitet und eine gerillte Mikrowellenquelle besitzt, welche durch die Vorrichtung gemäß einem der vorhergehenden Ansprüche erregt wird.
EP83400808A 1982-04-27 1983-04-22 Mikrowellen-Speisevorrichtung für rotationssymmetrischen Doppelbanderreger mit Rillen Expired EP0093058B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8207254 1982-04-27
FR8207254A FR2525823A1 (fr) 1982-04-27 1982-04-27 Dispositif d'excitation d'une source rainuree hyperfrequence bi-bande

Publications (2)

Publication Number Publication Date
EP0093058A1 EP0093058A1 (de) 1983-11-02
EP0093058B1 true EP0093058B1 (de) 1988-11-09

Family

ID=9273452

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83400808A Expired EP0093058B1 (de) 1982-04-27 1983-04-22 Mikrowellen-Speisevorrichtung für rotationssymmetrischen Doppelbanderreger mit Rillen

Country Status (4)

Country Link
US (1) US4573054A (de)
EP (1) EP0093058B1 (de)
DE (1) DE3378447D1 (de)
FR (1) FR2525823A1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4636797A (en) * 1985-03-04 1987-01-13 The United States Of America As Represented By The Secretary Of The Army Dual mode dichroic antenna/aperture
FR2736438B1 (fr) * 1995-07-07 1997-08-14 Thomson Csf Circuit de traitement polarimetrique de detection pour recepteur radar

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE569719A (de) * 1957-07-26
US3698001A (en) * 1969-11-11 1972-10-10 Nippon Telegraph & Telephone Frequency group separation filter device using laminated dielectric slab-shaped elements
FR2281660A1 (fr) * 1974-08-09 1976-03-05 Thomson Csf Dispositif muni d'une grille de filtrage
FR2349968A1 (fr) * 1976-04-27 1977-11-25 Thomson Csf Guide d'ondes a acces lateral et multiplexeur-demultiplexeur muni d'un tel guide
JPS54116869A (en) * 1978-03-03 1979-09-11 Mitsubishi Electric Corp Corrugate conic or pyramidal horn
US4258366A (en) * 1979-01-31 1981-03-24 Nasa Multifrequency broadband polarized horn antenna
JPS55141806A (en) * 1979-04-23 1980-11-06 Mitsubishi Electric Corp Corrugate cone horn/circular waveguide converter

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
1976 IEEE MTT-S INTERNATIONAL MICROWAVE SYMPOSIUM DIGEST OF TECHNICAL PAPERS, 14-16 juin 1976, pages 52-54, IEEE, Piscataway, USA I. OHTOMO et al.: "A 4, 6, 20 and 30 GHz band branching network using a multilayer dielectric filter for a satellite communication earth station" *

Also Published As

Publication number Publication date
FR2525823A1 (fr) 1983-10-28
DE3378447D1 (en) 1988-12-15
US4573054A (en) 1986-02-25
EP0093058A1 (de) 1983-11-02
FR2525823B1 (de) 1984-08-03

Similar Documents

Publication Publication Date Title
EP2130266B1 (de) Antenne mit einem resonator mit einer filterungsbeschichtung und system mit einer solchen antenne
EP0564359B1 (de) Mikrowellenstrahler und Plasmareaktor unter Verwendung dieser Einrichtung
EP2869400B1 (de) Doppelpolarisierter kompakter Leistungsverteiler, Netz aus mehreren Verteilern, kompaktes Strahlungselement und Flachantenne, die einen solchen Verteiler umfasst
EP0880193B1 (de) Antennenstrahler für Mikrowellensendung und empfang
EP2195877B1 (de) Omt-breitband- und multiband-/sende- und empfangs-/kopplungs- und trennvorrichtung für hochfrequenz-telekommunikationsantennen
EP0122834B1 (de) Mikrowellen-Wellentypwandler
FR2496347A1 (fr) Antenne de systeme de navigation omnidirectionnelle a tres haute frequence
EP3113286B1 (de) Quasioptischer strahlformer mit linse, und flachantenne, die einen solchen strahlformer umfasst
FR2704358A1 (fr) Duplexeur de polarissation à guide d'ondes.
EP0117803A1 (de) Breitbandiger primärer Mikrowellenhornstrahler und Antenne mit einem solchen primären Strahler
EP0149400B1 (de) Strahler mit einer Zirkularmoduserregungsvorrichtung
EP0093058B1 (de) Mikrowellen-Speisevorrichtung für rotationssymmetrischen Doppelbanderreger mit Rillen
EP0467818A1 (de) Übergangsstück zwischen elektromagnetischen Hohlleitern, insbesondere zwischen einem Rundhohlleiter und einem Koaxialhohlleiter
WO2008037887A2 (fr) Antenne a materiau bip (bande interdite photonique) systeme
EP0015837A2 (de) Antenne mit parallelen Flächen und Polarisationsdrehung
FR2538959A1 (fr) Lentille hyperfrequence bi-bande, son procede de fabrication et antenne radar bi-bande de poursuite
FR2594260A1 (fr) Source primaire hyperfrequence pour antenne a balayage conique et antenne l'incorporant.
EP0550320B1 (de) Wellenleiter mit geraden strahlenden Schlitzen, angeregt durch metallische Einsätze
EP0762529B1 (de) Iris-Polarisator für Antennenprimärstrahler
EP0623970A1 (de) Antenne mit zirkularem oder elliptischem Profil, feststehend oder rotierend, für einen oder mehrere multipolarisierte Wellen abgebende Mikrowellengeneratoren
FR2519475A1 (fr) Dispositif selectif accordable a ondes magnetostatiques de volume
FR2543368A1 (fr) Transformateur de modes
FR2704695A1 (fr) Source à rayonnement arrière pour antenne à réflecteur.
FR2538624A1 (fr) Source rayonnante a cavite ouverte et a polarisation commandee et antenne reseau comportant de telles sources
FR2766625A1 (fr) Antenne a polarisation circulaire un sens

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): DE GB IT NL SE

17P Request for examination filed

Effective date: 19840314

17Q First examination report despatched

Effective date: 19860210

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE GB IT NL SE

ITF It: translation for a ep patent filed
REF Corresponds to:

Ref document number: 3378447

Country of ref document: DE

Date of ref document: 19881215

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)
RAP4 Party data changed (patent owner data changed or rights of a patent transferred)

Owner name: THOMSON-CSF

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19900331

Year of fee payment: 8

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19900404

Year of fee payment: 8

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 19900405

Year of fee payment: 8

ITTA It: last paid annual fee
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 19900430

Year of fee payment: 8

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Effective date: 19910422

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Effective date: 19910423

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Effective date: 19911101

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee
GBPC Gb: european patent ceased through non-payment of renewal fee
PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Effective date: 19920201

EUG Se: european patent has lapsed

Ref document number: 83400808.8

Effective date: 19911108