EP0617477B1 - H-förmige Hohlleiterstruktur mit einem Haupt- und zwei Nebenhohlleitern zum Leiten zweier Wellen mit unterschiedlicher Frequenz. - Google Patents

H-förmige Hohlleiterstruktur mit einem Haupt- und zwei Nebenhohlleitern zum Leiten zweier Wellen mit unterschiedlicher Frequenz. Download PDF

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Publication number
EP0617477B1
EP0617477B1 EP94400524A EP94400524A EP0617477B1 EP 0617477 B1 EP0617477 B1 EP 0617477B1 EP 94400524 A EP94400524 A EP 94400524A EP 94400524 A EP94400524 A EP 94400524A EP 0617477 B1 EP0617477 B1 EP 0617477B1
Authority
EP
European Patent Office
Prior art keywords
guide
line
primary
ribs
line according
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
EP94400524A
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English (en)
French (fr)
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EP0617477A1 (de
Inventor
Bernard Debever
Thierry Jacqueminet
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.)
Societe Anonyme de Telecommunications SAT
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Societe Anonyme de Telecommunications SAT
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/30—Combinations of separate antenna units operating in different wavebands and connected to a common feeder system
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P3/00—Waveguides; Transmission lines of the waveguide type
    • H01P3/12—Hollow waveguides
    • H01P3/123—Hollow waveguides with a complex or stepped cross-section, e.g. ridged or grooved waveguides
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
    • H01Q5/40—Imbricated or interleaved structures; Combined or electromagnetically coupled arrangements, e.g. comprising two or more non-connected fed radiating elements

Definitions

  • the present invention relates to a waveguide line with two symmetrical internal ribs, arranged to provide a median constriction in the guide and reduce the cut-off frequency of the guide, and to an excitation probe plunging into the constriction.
  • a missile On board a missile, for example, it can be used, which is also radiated at the end to serve as an antenna, between a transmitter, for example again, for telemetry or trajectography, and an orifice made in the skin of the missile. Telemetry is carried out in a frequency band around 2 GHz, trajectography in a band around 5 GHz.
  • a waveguide Since a waveguide has a cross section adapted to a single frequency range, as many radiation guides and orifices are needed as there are applications. It is an expensive and cumbersome solution because the orifices must be protected by materials transparent to radiation and often withstand heating. In addition, the radiation holes are very troublesome, because they can create a surface discontinuity and alter the aerodynamics of the craft.
  • the present invention therefore aims to propose a waveguide line adapted to at least two distinct frequency ranges.
  • the invention relates to a line of the type defined above in which two secondary split guides of cross section smaller than that of the waveguide line with two ribs, called primary, being thus formed on both sides.
  • other of the median constriction, constituting a median slot for the secondary guides there is provided a another excitation probe plunging into one of the two secondary guides.
  • the primary guide is designed to transmit a first frequency band, thanks to the fact that the constriction creates a primary guide with double groove and two lateral secondary guides.
  • Each secondary guide can transmit, without being disturbed, despite the constriction acting as a median slot, a second frequency in a second frequency band which is specific to it.
  • a rib makes it possible to reduce the section of the primary waveguide line for the same band of transmitted frequencies, or else, with a maintained section, to reduce the cut-off frequency.
  • each secondary guide has a smaller section than that of the primary guide, the frequencies of the band of the secondary guides are higher than those of the primary band.
  • the secondary guides are internally ribbed, with the advantages mentioned above.
  • the ribs of the primary guide can be shaped to constitute a rib in each ribbed secondary guide.
  • the cross section of the primary guide is a rectangle.
  • the line is open at one end, to form a waveguide antenna with radiation at the end.
  • the line guide of Figures 1 and 2 is a guide with a rectangular cross section. It has two internal ribs 4 and 6, T-shaped which extend over the entire length of the guide. Transversally, they extend, by their feet, from the middle of the long sides of the rectangle of the guide section.
  • the two ribs 4 and 6 are symmetrical with respect to a longitudinal median plane 10 of the guide and form between them a median longitudinal throttle 8.
  • the constriction 8, of rectangular section in FIG. 1, constitutes the central part of a cavity 12, forming a primary guide, which therefore comprises two secondary cavities 14 and 16 physically connected by the constriction 8.
  • the secondary cavities 14 and 16 are arranged symmetrically on either side of a plane of symmetry 11 of the ribs 4 and 6, thus than the guide.
  • Each secondary cavity 14 and 16 forms a secondary guide of generally rectangular cross section, the length of which extends parallel to the width of the cross section of the primary guide 12.
  • the ends of the bars of the T of the ribs 4 and 6 form, in each secondary guide 14 and 16, a pair of ribs, respectively 41, 61 and 42, 62.
  • the distance separating the ribs 4 and 6 being relatively small compared to the length of the walls 7 and 9, the ribs of each secondary guide can be considered as adjacent, as if the constriction did not exist.
  • the probe 23 is arranged to excite the primary waveguide line in linear polarization at a first frequency, of a value chosen so that the corresponding electromagnetic wave propagates in the guide line using the entire volume of the primary guide 12.
  • the secondary guide 14 has a bore 24 formed in the wall 7 in the median plane 10.
  • the waveguide lines radiate at their ends opposite to that of the excitation probes 23 and 25.
  • the two electromagnetic waves generated by the probes 23 and 25 propagate perpendicular to the plane of FIG. 1, in the direction of the radiation end close to the cross section shown in FIG. 2.
  • the wave at the first frequency propagates occupying the entire volume of the primary guide 12.
  • the wave at the second frequency propagates with a polarization orthogonal to that of the first wave, so that there is absence of coupling and corresponding loss. Measurements have shown that decoupling exceeds 40 decibels. The direction of the polarization of the wave at the second frequency prevents a transfer of energy from this wave from the first secondary guide 14 to the other secondary guide 16 through the throttle 8.
  • the end of the constriction 8 opening into the secondary guide 14 constitutes a slot extending along the length of the secondary guide line, perpendicular to the plane of the figures.
  • the slot described above is located in the median plane 10.
  • a slot of this kind does not cause losses as long as its width is small relative to the length of the wall in which it is formed, which is the case here.
  • the radiating opening of the waveguide line forms an antenna, shown in cross section in Figure 2, the other end of the line being closed.
  • the upper bar of the T of each rib 4 and 6 has a central notch 65, 66, here rectangular, between its ends, respectively 41, 42 and 61, 62, which widens the constriction 8 in the central part of its cross section, while keeping the width of the constriction 8 constant at its outlet forming a slot in each secondary guide 14 and 16.
  • the depth of the notch indicated above is all the greater the closer the section considered is to the radiating opening.
  • the modification of the shape of the throttle 8 has the effect of adapting the characteristic line impedance to that presented by the load at the end of the line, that is to say the air.
  • the progressiveness of the transition avoids the creation of significant parasitic reflections, the report standing waveform being less than 1.5 in the vicinity of the central frequency of the primary guide 12.
  • the modification of the shape of the constriction 8 exposed above is only a particular example and other modifications of shape are possible. In particular, they can also bear on the shape of the ribs 41, 42, 61 and 62 of the secondary guides 14 and 16.
  • the secondary guides 14, 16 could comprise a second rib, like that (63, 64) s' extending along the wall 7, 9 opposite the slot 8, and shown in broken lines in Figure 1, for example in one piece with the associated wall.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Waveguide Aerials (AREA)

Claims (9)

  1. Wellenleiterverbindung mit zwei symmetrischen inneren Rippen (4, 6), die derart angeordnet sind, daß in dem Leiter eine Mittenverengung (8) vorgesehen ist und die Grenzfrequenz des Leiters verringert wird, sowie mit einer Erregersonde (23), die in die Verengung (8) versenkt ist,
    dadurch gekennzeichnet, daß zwei gespaltene Sekundärleiter (14, 16) mit einem kleineren Querschnitt als demjenigen der sogenannten Primärwellenleiterverbindung (12) mit zwei Rippen also beiderseits der mittleren Verengung (8) gebildet sind, die einen mittleren Spalt für die Sekundärleiter bildet, und eine weitere Erregersonde (25) vorgesehen ist, die in einen der beiden Sekundärleiter (14) versenkt ist.
  2. Verbindung nach Anspruch 1, bei der die beiden Sekundärleiter (14, 16) auch im Inneren mit Rippen (41, 61, 63; 42, 62, 64) versehen sind.
  3. Verbindung nach einem der Ansprüche 1 und 2, bei der die Rippen (4, 6) des Primärleiters (12) derart geformt sind, daß sie in jedem mit Rippen versehenen Sekundärleiter (14, 16) eine Rippe (41, 61; 42, 62) bilden.
  4. Verbindung nach einem der Ansprüche 1 bis 3, bei der die beiden Sonden (23, 25) derart angeordnet sind, daß sie jeweils zwei orthogonale Felder erzeugen.
  5. Verbindung nach einem der Ansprüche 1 bis 4, bei der die Verengung (8) des Primärleiters (12) bezüglich der Abmessungen des Querschnitts (7) eine relativ geringe Dicke aufweist.
  6. Verbindung nach einem der Ansprüche 1 bis 5, bei welcher der Querschnitt des Primärleiters ein Rechteck ist.
  7. Verbindung nach Anspruch 6, bei der sich die Verengung (8) des Primärleiters (12) parallel zur Länge des Rechtecks erstreckt.
  8. Wellenleiterantenne mit Endstrahlung, dadurch gekennzeichnet, daß sie durch eine Wellenleiterverbindung nach einem der Ansprüche 1 bis 7 gebildet und ferner an einem Ende offen ist.
  9. Antenne nach Anspruch 8, bei der die Rippen des mit Rippen versehenen Primärleiters (12) und der Sekundärleiter (14, 16) der an einem Ende offenen Verbindung derart geformt sind, daß sie die Impedanzen an die Öffnung der Verbindung anpassen.
EP94400524A 1993-03-23 1994-03-10 H-förmige Hohlleiterstruktur mit einem Haupt- und zwei Nebenhohlleitern zum Leiten zweier Wellen mit unterschiedlicher Frequenz. Expired - Lifetime EP0617477B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9303301A FR2703189B1 (fr) 1993-03-23 1993-03-23 Ligne guide d'ondes.
FR9303301 1993-03-23

Publications (2)

Publication Number Publication Date
EP0617477A1 EP0617477A1 (de) 1994-09-28
EP0617477B1 true EP0617477B1 (de) 1997-06-04

Family

ID=9445235

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94400524A Expired - Lifetime EP0617477B1 (de) 1993-03-23 1994-03-10 H-förmige Hohlleiterstruktur mit einem Haupt- und zwei Nebenhohlleitern zum Leiten zweier Wellen mit unterschiedlicher Frequenz.

Country Status (3)

Country Link
EP (1) EP0617477B1 (de)
DE (1) DE69403530T2 (de)
FR (1) FR2703189B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20170237176A1 (en) * 2015-02-17 2017-08-17 City University Of Hong Kong Differential planar aperture antenna

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7117409B1 (ja) * 2021-03-01 2022-08-12 アンリツ株式会社 伝送線結合構造

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4119967A (en) * 1976-05-21 1978-10-10 Teledyne, Inc. Microwave dual mode non-interfering CW and pulsed signal system method and apparatus

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2441574A (en) * 1944-02-29 1948-05-18 Sperry Corp Electromagnetic wave guide
IT1149770B (it) * 1982-02-25 1986-12-10 Italtel Spa Circuito per separare due bande di frequenze per segnali ad altissima frequenza in doppia polarizzazione

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4119967A (en) * 1976-05-21 1978-10-10 Teledyne, Inc. Microwave dual mode non-interfering CW and pulsed signal system method and apparatus

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20170237176A1 (en) * 2015-02-17 2017-08-17 City University Of Hong Kong Differential planar aperture antenna
US10050350B2 (en) * 2015-02-17 2018-08-14 City University Of Hong Kong Differential planar aperture antenna

Also Published As

Publication number Publication date
EP0617477A1 (de) 1994-09-28
FR2703189B1 (fr) 1995-05-24
DE69403530D1 (de) 1997-07-10
DE69403530T2 (de) 1998-01-29
FR2703189A1 (fr) 1994-09-30

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