EP0805512B1 - Kompakt gedruckte Antenne mit geringer Strahlung in Elevationsrichtung - Google Patents

Kompakt gedruckte Antenne mit geringer Strahlung in Elevationsrichtung Download PDF

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Publication number
EP0805512B1
EP0805512B1 EP97460016A EP97460016A EP0805512B1 EP 0805512 B1 EP0805512 B1 EP 0805512B1 EP 97460016 A EP97460016 A EP 97460016A EP 97460016 A EP97460016 A EP 97460016A EP 0805512 B1 EP0805512 B1 EP 0805512B1
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EP
European Patent Office
Prior art keywords
antenna
mode
radiating element
slots
antenna 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
EP97460016A
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English (en)
French (fr)
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EP0805512A1 (de
Inventor
Patrice Brachat
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.)
Orange SA
Original Assignee
France Telecom 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 France Telecom SA filed Critical France Telecom SA
Publication of EP0805512A1 publication Critical patent/EP0805512A1/de
Application granted granted Critical
Publication of EP0805512B1 publication Critical patent/EP0805512B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
    • H01Q9/04—Resonant antennas
    • H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna

Definitions

  • the field of the invention is that of printed planar emission antennas and / or receiving microwave signals.
  • the invention relates to a planar antenna producing a maximum radiation for low elevations.
  • the antenna of the invention has many applications. It can for example be used in a network placed on the roof of a private vehicle, in order to ensure satellite telecommunications. Indeed, some mobiles, and in particular those in connection with geostationary satellites in countries with medium or high latitude (Europe of North for example), require flat antennas producing maximum radiation for low elevations.
  • a printed antenna includes a substrate plate dielectric, a ground plane (consisting of a first conductive deposit deposited on a first face of the dielectric substrate plate), a radiating element (constituted by a second conductive deposit deposited on a second face of the substrate plate dielectric) and antenna feed means.
  • these printed antennas In their current operation, that is to say when they operate in their fundamental mode, these printed antennas generate a radiation diagram having a maximum in the direction perpendicular to the plane containing the antenna.
  • the length of the radiating element is very close to half the length wave taking into account the permittivity of the dielectric substrate used.
  • the printed antennas To be able to generate a radiation having a maximum for weak elevations, i.e. in directions away from the axis perpendicular to the plane containing the antenna, the printed antennas must operate in a higher mode whose current distribution makes it possible to create this type of radiation.
  • the major problem resides in the fact that the higher modes presenting the interest appears for relatively high frequencies compared to those of fundamental mode. This means that to be able to use this type of mode (higher) for the desired frequency band (close to that corresponding to the fundamental mode), the antenna must be very oversized.
  • the invention particularly aims to overcome this major drawback of the state of technique.
  • one of the objectives of the present invention is to provide a printed antenna to obtain radiation for low elevations while with a reduced bulk.
  • the invention also aims to provide such an antenna which retains all the advantages of printed antennas, and in particular a low manufacturing cost.
  • the superior mode chosen is the one in which we want to see operate the antenna, so that the maximum radiation is generated for low elevations.
  • the general principle of the invention consists, for a given higher mode, reduce the resonant frequency only by making notches on the element radiant, that is to say without modifying the overall size of the antenna.
  • the printed antenna of the invention has a smaller footprint than a conventional printed antenna.
  • the notch (s) are arranged substantially perpendicular to the current lines of said selected upper mode.
  • the dimensions (length, width) of the notch (s) are determined from a calculation technique based on an element method finished.
  • said radiating element is in the form of a disc.
  • said upper mode chosen is mode TM21, the streamlines of which form a pattern which is repeated in each quarter of said disc, said radiating element has four radial notches, spaced two by two angularly about 90 °, each of said notches being substantially perpendicular to the current lines in one of said quarters of the disc.
  • said upper mode chosen is mode TM01, the currents of which are arranged radially, said radiating element having at least one circular notch, the one or more notches extending over at least part of the circumference of a circle contained in said disc and having the same center as the latter.
  • each notch cooperates with means of annihilation of its effect, said antenna comprising means for activating / deactivating said means of annihilation.
  • said means for annihilating the effect of a notch comprise a diode connecting the two edges of said notch.
  • This multimode operation makes it possible to cover a solid wide angle with a maximum radiation.
  • said radiating element has a plurality of notches, said activation / deactivation means acting on a time-varying number of annihilation means associated with said plurality of notches, so as to allow multifrequency operation such that each distinct number of annihilation means activated at a given time corresponds to a particular resonant frequency of said selected upper mode.
  • the invention also relates to a dual-band antenna, characterized in that it includes two superimposed antennas, called lower and upper antennas, of the type those presented above, the radiating element of said lower antenna constituting the ground plane of said upper antenna.
  • the invention therefore relates to a planar printed antenna for transmission and / or reception of microwave signals.
  • the antenna presents a fundamental mode, in which it generates a diagram of radiation having a maximum in the direction perpendicular to the plane containing the radiating element, and at least one higher mode, in which it generates a radiation diagram at low elevation.
  • FIG. 2 presents a variation curve, as a function of the frequency, of the Standing wave ratio (ROS) of the conventional antenna in Figure 1. This curve clearly shows the resonant frequencies F1 and F2.
  • ROS Standing wave ratio
  • FIG 3 shows a top view of the first antenna according to the invention.
  • the radiating element 30 has four radial notches 31 to 34, spaced two by two angularly around 90 °.
  • the TM21 mode current lines form a pattern which is repeat according to the quarter of the disc (the currents being represented in dotted lines).
  • the notches 31 to 34 are placed in order to obtain maximum interception of the currents on the element radiating 30. In other words, each notch is substantially perpendicular to the streamlines in one quarter of the disc 30.
  • these values are preferably obtained using a calculation technique (implemented by software) based on an element method finished.
  • the purpose of the first antenna is to decrease the mode's resonant frequency higher TM21.
  • the invention therefore makes it possible to considerably reduce the size of the structure by compared to a conventional antenna. Indeed, to obtain a TM21 mode working on frequency of 1.662 GHz, a solid disk with an approximate diameter is required 119 mm instead of the 73.5 mm diameter of the first antenna of the invention. So, in this specific example, the invention allows a reduction in the size of the antenna about 40%.
  • FIGS. 6 and 9 each show the complete radiation diagram, for the Etheta and Ephi components respectively, of the first antenna of the invention.
  • the radiation patterns were measured at the resonant frequency of the TM21 mode.
  • the directivity is 5.56 dB.
  • Figure 12 shows a top view of the second antenna according to the invention.
  • the radiating element 40 has four circular notches 41 to 44, placed in parallel at the circumference of the disc 40.
  • the current lines of the TM01 mode are circular (the currents, shown in dotted lines, being arranged radially).
  • the notches 41 to 44 are placed in order to obtain maximum interception of the currents on the radiating element 40. In in other words, each notch is substantially perpendicular to the current lines in one of the quarters of disc 40.
  • these values are preferably obtained using the abovementioned calculation technique based on a finite element method.
  • the second antenna aims to decrease the mode resonant frequency upper TM01.
  • the invention therefore makes it possible to considerably reduce the size of the structure by compared to a conventional antenna. Indeed, to obtain a TM01 mode working on the frequency of 2.104 GHz, a solid disc with an approximate diameter is required 117 mm instead of the 73.5 mm diameter of the second antenna of the invention. So, in this specific example, the invention again allows a reduction in the size of the antenna by around 40%.
  • Figures 15 and 18 each present the complete radiation diagram, for the Etheta and Ephi components respectively, of the second antenna of the invention.
  • the radiation patterns were measured at the resonant frequency of the TM01 mode.
  • the radiation patterns are presented in the same way as those Figures 6 and 9.
  • the directivity obtained for this antenna is 6.31 dB.
  • FIG 23 shows a top view of a particular embodiment of a antenna according to the invention, in which each notch cooperates with means 61 annihilation of its effect.
  • the antenna also includes activation means / deactivation of these means 61 of annihilation.
  • These means (not shown) of activation / deactivation are for example an electronic control device.
  • the means for annihilating the effect of a notch comprise a diode varactor 61 connecting the two edges of this notch.
  • the means activation / deactivation act on a variable number in time of diodes, of so that each distinct number of diodes activated at a given time corresponds to a particular resonant frequency of the selected higher mode.
  • Figures 24 and 25 each show a view, respectively from the side and from above, of a particular embodiment of a dual-band antenna according to the invention.
  • This dual band antenna includes two antennas (lower 70 and upper 71) superimposed.
  • the radiating element (for example a disc) 72 of the lower antenna 71 constitutes the ground plane of the upper antenna 71.
  • the lower antenna 70 comprises a ground plane 73, a substrate plate (not shown), a radiating element 72 and a first coaxial supply 74.
  • the upper antenna 71 comprises a ground plane (constituted by the radiating element 72 of the lower antenna 70), a substrate plate (not shown), an element radiating 75 and a second coaxial supply 76.
  • Each antenna 70, 71 operates independently.
  • the two discs 72, 75 are offset so that the attack of the upper disc 75 crosses the lower disc 72 in the middle, so as to minimize the disturbance thus brought.

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  • Waveguide Aerials (AREA)

Claims (12)

  1. Ebene gedruckte Antenne zum Senden und/oder Empfangen von Mikrowellensignalen von der Art, die hauptsächlich Folgendes umfasst:
    eine dielektrische Substratplatte (1),
    eine Erdüngsebene (2), bestehend aus einer ersten Ablagerung eines leitfähigen Materials, das auf einer ersten Fläche der dielektrischen Substratplatte aufgebracht wird,
    ein strahlendes Element (30; 40; 50), das aus einer zweiten leitfähigen Ablagerung gebildet wird, das auf eine zweite Fläche der dielektrischen Substratplatte aufgebracht wird,
    Mittel (4) zum Speisen der Antenne,
    wobei die Antenne eine Grundschwingung (TM11) aufweist, bei der sie ein Strahlungsdiagramm erzeugt, das in der senkrechten Richtung auf die das strahlende Element enthaltende Ebene ein Maximum aufweist sowie mindestens eine Oberschwingung (TM21, TM01), in der sie ein Strahlungsdiagramm mit kleinem El-Winkel bzw. kleiner Elevation erzeugt,
    dadurch gekennzeichnet, dass das strahlende Element mindestens einen Einschnitt (31 bis 34; 41 bis 44) aufweist, der so gestaltet ist, dass die Resonanzfrequenz einer gewählten Oberschwingung gesteuert werden kann.
  2. Antenne nach Anspruch 1, dadurch gekennzeichnet, dass der Einschnitt bzw, die Einschnitte (31 bis 34; 41 bis 44) in etwa senkrecht zu den Stromlinien bzw. Feldlinien der gewählten Oberschwingung angeordnet ist bzw. sind.
  3. Antenne nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, dass die Abmessungen des Einschnittes oder der Einschnitte (31 bis 34; 41 bis 44) auf der Grundlage einer auf einer Methode der finiten Elemente basierenden Berechnungstechnik ermittelt werden.
  4. Antenne nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die Einspeisemittel eine Einspeisetechnik aus der Gruppe anwenden, die folgendes umfasst:
    Einspeisung durch Koaxialsonde (4);
    Einspeisung durch Schlitzkopplung (53);
    Einspeisung durch Nähekopplung;
    Einspeisung durch Einspeiseleitung in der Ebene des strahlenden Elementes.
  5. Antenne nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass das strahlende Element (30; 40; 50) die Form einer Kreisscheibe aufweist.
  6. Antenne nach Anspruch 5, dadurch gekennzeichnet, dass es sich bei der gewählten Oberschwingung um die Oberschwingung TM21 handelt, deren Stromlinien bzw. Feldlinien ein Muster bilden, das sich in jedem Viertel der Kreisscheibe wiederholt und,
    dass die strahlenden Elemente (30) vier radiale Einschnitte (31 bis 34) aufweisen, die paarweise durch einen Winkel von etwa 90° voneinander getrennt sind, wobei jeder der Einschnitte in etwa senkrecht zu den Stromlinien bzw. Feldlinien in einem der Viertel der Kreisscheibe liegt.
  7. Antenne nach Anspruch 5, dadurch gekennzeichnet, dass es sich bei der gewählten Oberschwingung um die Oberschwingung TM01 handelt, deren Stromlinien bzw. Feldlinien radial verlaufen und,
    dass die strahlenden Elemente (40) mindestens einen kreisförmigen Einschnitt (41 bis 44) dort aufweisen, wo sich die Einschnitte über mindestens einen Teil des Umfangs eines Kreises erstrecken, der in der Kreisscheibe und konzentrisch mit dieser enthalten ist.
  8. Antenne nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, dass jeder Einschnitt mit Mitteln (61) zur Vernichtung seiner Wirkung zusammenwirkt und,
    dass er Mittel zum Aktivieren/Deaktivieren der erwähnten Verriichtungsmittel umfasst.
  9. Antenne nach Anspruch 8, dadurch gekennzeichnet, dass die Mittel zur Vernichtung der Wirkung eines Einschnitts eine Diode (61) umfassen, die beide Ränder des Einschnitts verbindet.
  10. Antenne nach einem der Ansprüche 8 oder 9, dadurch gekennzeichnet, dass das strahlende Element eine Vielzahl von Einschnitten aufweist und,
    dass die Mittel zum Aktivieren/Deaktivieren gleichzeitig auf alle mit der Vielzahl von Einschnitten zusammenhängende Vernichtungsmittel (61) wirken, um eine Multimodearbeitsweise zu ermöglichen, so dass
    wenn alle Vernichtungsmittel aktiviert sind, die Antenne in der erwähnten Grundschwingung arbeitet,
    wenn alle Vernichtungsmittel deaktiviert sind, die Antenne in-der gewählten Oberschwingung arbeitet.
  11. Antenne nach einem der Ansprüche 8 oder 9, dadurch gekennzeichnet, dass das strahlende Element eine Vielzahl von Einschnitten aufweist und,
    dass die Mittel zum Aktivieren/Deaktivieren auf eine zeitlich variable Zahl von Vernichtungsmitteln (61) wirken, die mit der Vielzahl von Einschnitten assoziiert sind, um einen Mehrfrequenzbetrieb zu ermöglichen, welcher derart gestaltet ist, dass jede verschiedene Zahl von Vernichtungsmitteln, die zu einem gegebenen Zeitpunkt aktiviert wird, einer bestimmten Resonanzfrequenz der gewählten Oberschwingung entspricht.
  12. Zweibandantenne, dadurch gekennzeichnet, dass sie zwei überlagerte Antennen umfasst, genannt untere Antenne (70) und obere Antenne (71) nach einem der Ansprüche 1 bis 11, wobei das strahlende Element (72) der unteren Antenne die Erdungsebene der oberen Antenne bildet.
EP97460016A 1996-04-24 1997-04-17 Kompakt gedruckte Antenne mit geringer Strahlung in Elevationsrichtung Expired - Lifetime EP0805512B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9605383A FR2748162B1 (fr) 1996-04-24 1996-04-24 Antenne imprimee compacte pour rayonnement a faible elevation
FR9605383 1996-04-24

Publications (2)

Publication Number Publication Date
EP0805512A1 EP0805512A1 (de) 1997-11-05
EP0805512B1 true EP0805512B1 (de) 2002-11-06

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EP97460016A Expired - Lifetime EP0805512B1 (de) 1996-04-24 1997-04-17 Kompakt gedruckte Antenne mit geringer Strahlung in Elevationsrichtung

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US (1) US5966096A (de)
EP (1) EP0805512B1 (de)
CA (1) CA2203359A1 (de)
DE (1) DE69716807T2 (de)
FR (1) FR2748162B1 (de)

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Also Published As

Publication number Publication date
CA2203359A1 (en) 1997-10-24
FR2748162B1 (fr) 1998-07-24
DE69716807T2 (de) 2003-07-10
DE69716807D1 (de) 2002-12-12
US5966096A (en) 1999-10-12
FR2748162A1 (fr) 1997-10-31
EP0805512A1 (de) 1997-11-05

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