[go: up one dir, main page]

EP2880712B1 - Verfahren zur elektromagnetischen entkopplung einer antenne und stützmast dafür sowie entsprechender stützmast - Google Patents

Verfahren zur elektromagnetischen entkopplung einer antenne und stützmast dafür sowie entsprechender stützmast Download PDF

Info

Publication number
EP2880712B1
EP2880712B1 EP13756618.8A EP13756618A EP2880712B1 EP 2880712 B1 EP2880712 B1 EP 2880712B1 EP 13756618 A EP13756618 A EP 13756618A EP 2880712 B1 EP2880712 B1 EP 2880712B1
Authority
EP
European Patent Office
Prior art keywords
antenna
pole
mast
decoupling
electrically conductive
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.)
Not-in-force
Application number
EP13756618.8A
Other languages
English (en)
French (fr)
Other versions
EP2880712A1 (de
Inventor
Sébastien PALUD
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.)
Telediffusion de France ets Public de Diffusion
Original Assignee
Telediffusion de France ets Public de Diffusion
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 Telediffusion de France ets Public de Diffusion filed Critical Telediffusion de France ets Public de Diffusion
Publication of EP2880712A1 publication Critical patent/EP2880712A1/de
Application granted granted Critical
Publication of EP2880712B1 publication Critical patent/EP2880712B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
    • H01Q1/528—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure reducing the re-radiation of a support structure
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/24—Combinations of antenna units polarised in different directions for transmitting or receiving circularly and elliptically polarised waves or waves linearly polarised in any direction

Definitions

  • the invention relates to a decoupling method between an antenna and its support mast and a corresponding support mast.
  • Wave transmission systems for broadcast generally include an antenna transmitting horizontal polarization waves.
  • some systems such as broadcasting or private radio, for example for police or firefighters, include antennas transmitting vertical polarization waves.
  • Such an antenna is generally mounted on a vertical support mast, made of an electrically conductive material, connected to the Earth and arranged to allow the passage of lightning to the Earth when it reaches the mast.
  • the electromagnetic radiation waves emitted towards the mast induces currents on the mast, thus creating a coupling between the antenna and the mast.
  • Such inductive coupling between the antenna and the mast may cause parasitic radiation capable of deforming the antenna radiation, especially towards the mast, and reducing the efficiency of the antenna in this direction and in the surroundings, which has a disadvantage.
  • the object of the present invention is to remedy this drawback and to improve the efficiency of an antenna which is arranged to emit at least partially vertical polarization waves and which is carried by a vertical antenna support mast, made of an electrically conductive material.
  • the invention is intended in particular to allow the electromagnetic decoupling between the antenna and its support mast.
  • the invention relates to a method of electromagnetic decoupling between a substantially vertical support mast, made of an electrically conductive material, and an antenna emitting, in a frequency band centered on a central frequency, polarization waves at least partially vertical and wide by said support mast, characterized in that said antenna is mounted on said mast by a connecting arm and in that there is arranged on the support mast, between the antenna and the mast, at least two electromagnetic decoupling devices comprising at least one electrically conductive decoupling element of length between one fifth and one third of the wavelength of the waves emitted by the antenna at the central frequency, at least one first device being disposed on the mast above said connecting arm and at least a second device being disposed on the mast below said connecting arm, so as to neutralize the currents induced in the mast by the waves emitted by said antenna.
  • neutralize it is meant that the majority of currents induced by the antenna in the support mast are blocked so as to obtain a quasi-constant omnidirectional radiation of the antenna.
  • quasi-constant means that the radiation deviation is less than 2 dB in all directions.
  • the method according to the invention allows substantially equal radiation in all directions , within plus or minus 1 dB.
  • the antenna is mounted on the mast by a connecting arm, at least a first decoupling device being disposed on the mast above said linkage arm and at least one second decoupling device being placed on the mast below said linkage connecting arm.
  • An antenna is generally configured to work on a frequency band [f 1 , f 2 ], that is to say to emit waves at frequencies between a low frequency f 1 and a high frequency f 2 , by example itself included in the VHF or UHF bands.
  • the frequency band can be reduced to a single frequency.
  • At least one decoupling device is disposed coaxially with the mast.
  • the decoupling element has a length of between one quarter and one third, preferably approximately three tenths, of the wavelength of the waves emitted by the antenna at the central frequency.
  • the decoupling element is at least partially parallel to the mast.
  • the arrangement of such a decoupling device makes it possible to prevent these from decreasing the current. level of radiation from the antenna towards the antenna support mast.
  • the arrangement of such a device on the mast allows the omnidirectionality of an antenna working with waves whose component is vertical, preferably whose main component is vertical, avoiding that the coupling of the The antenna and the support mast do not reduce the antenna radiation in the mast direction in the direction of the antenna towards the mast.
  • At least one decoupling device is arranged along the mast at least over the height of the antenna.
  • the invention also relates to a substantially vertical support mast, made of an electrically conductive material and comprising at least one antenna transmitting, in a frequency band centered on a central frequency, at least partially vertical polarization waves, characterized in that that the antenna is mounted on the mast by a connecting arm and in that it comprises at least two electromagnetic decoupling devices arranged between the antenna and the support mast, at least one first device being placed on the mast above the mast; above said link arm and at least one second device being disposed on the mast below said link arm, and comprising at least one electrically conductive decoupling element of length between one fifth and one third of the wavelength of the waves transmitted by the antenna at the central frequency, so as to neutralize the currents induced in the mast by the waves emitted by the the antenna.
  • a decoupling device can in particular make it possible to decouple independent antenna systems fixed on the mast.
  • At least one decoupling device is coaxial with the mast.
  • At least one decoupling element is at least partially parallel to the mast.
  • At least one decoupling element comprises a portion of length between one-fourth and one-eighth of the wavelength of the waves emitted by the antenna at the central frequency, preferably extending parallel to the mast, so that to allow efficient operation of the broadband antenna.
  • the mast comprises a plurality of decoupling elements, advantageously at least eight, preferably at least twelve, in the form of equilateral metal rods bent L-shaped and each comprising a first portion arranged vertically, in parallel at the mast, and a second portion disposed horizontally, perpendicular to the mast and connecting it to the lower end of the first portion so as to form a short-circuit line.
  • decoupling elements advantageously at least eight, preferably at least twelve, in the form of equilateral metal rods bent L-shaped and each comprising a first portion arranged vertically, in parallel at the mast, and a second portion disposed horizontally, perpendicular to the mast and connecting it to the lower end of the first portion so as to form a short-circuit line.
  • the upper end of the first portion is then in open circuit so as to allow on the mast, at the right of said upper end, an electrical break of the mast.
  • the term relative frequency band refers to the ratio (f 2 - f 1 ) / f 0 , often expressed as a percentage.
  • the mast comprises a plurality of cages
  • the vertical misalignment of the cages with respect to the mast modifies little the performance of the decoupling device. Nevertheless, the same orientation is preferentially maintained on all the cages to allow a regular electric break of the mast.
  • break electrical means here the neutralization of the currents induced by the antenna in the support mast.
  • the mast comprises a plurality of decoupling devices
  • the sum of the height of a device and the spacing between said device and a device disposed consecutively on the mast is less than a quarter of the wavelength at the high frequency of the frequency band in which the antenna operates. Therefore, when two decoupling devices are arranged so spaced along the mast, the portion of the mast at the right of said sum forms a section electrically insulating the portion of the mast above said section of the portion of the mast located below said section.
  • Such an isolation section greatly attenuates the parasitic radiation created by the currents induced by the radiation of the antenna.
  • a number of decoupling cages as defined above and placed at least over the height of the portion of the mast that is at right angles to the antenna makes it possible to limit the variations of radiation from the antenna to the antenna. or at least 1 dB at 360 °.
  • the cage or cages are arranged over a height h greater than or equal to 1.5 ⁇ L, where L represents the largest dimension of the antenna in the vertical direction.
  • the number of cages is greater than or equal to four, preferably on a mast length of between half the wavelength and the length of the antenna. wave at the high frequency f 2 of operation of the antenna.
  • the antenna is omnidirectional.
  • the omnidirectional antenna is a dipole, for example of the half-wave dipole type, configured to emit substantially vertical polarization waves.
  • the antenna When the antenna is a half-wave doublet, it is preferably arranged vertically and substantially parallel to the mast.
  • the omnidirectional antenna is a monopole, for example of the ground plane antenna type.
  • a monopole comprises a ground plane, for example perpendicular to the monopole.
  • the antenna may also be in the form of a double dipole, for example positioned on the upper part of the mast or a double V-dipole generating elliptical polarization waves.
  • the mast comprises at least one metal tube, for example whose section is less than or equal to one-tenth of the wavelength corresponding to the central frequency emitted by the antenna. This allows the antenna to work effectively in FM band.
  • the mast is in the form of a single metal tube.
  • the decoupling device (s) are arranged along the mast in line with the antenna at least over the height thereof.
  • the invention also relates to an electromagnetic decoupling device between a support mast, as defined above, substantially vertical, made of an electrically conductive material, and an antenna emitting, in a frequency band centered on a central frequency, at least partially vertical polarization waves carried by said support mast, characterized in that it is configured to be disposed between the antenna and the support mast and in that it comprises at least one electrically decoupling element conductor of length between one fifth and one third of the wavelength of the waves emitted by the antenna at the central frequency, so as to neutralize the currents induced in the mast by the waves emitted by said antenna.
  • Such a device allows a significant reduction of the contact currents and risks of intermodulation on the carrier mast.
  • the decoupling device comprises a plurality of decoupling elements, advantageously at least eight, preferably at least twelve, in the form of metal rods, preferably made of a metal rod.
  • metal or a metal alloy of high conductivity for example greater than 1.10 6 S / m.
  • the rods are equidistributed.
  • the rods are bent L-shaped and each comprise a first portion, configured to be disposed vertically, parallel to the mast, and a second portion, configured to be disposed horizontally, perpendicular to the mast and connecting it to the lower end of the first portion so as to form a short-circuit line.
  • the decoupling device comprises an electrically conductive ring connecting the upper ends of the first portion of each of the rods so as to form a substantially cylindrical structure or cage configured to be mounted coaxially. on the support mast.
  • a structure is electrically conductive and may be, for example, metallic.
  • the device may further comprise a second electrically conductive ring of substantially the same diameter as the first ring connecting the rods to each other at their bends.
  • the diameter D of a cage can be variable and depends on the diameter d of the mast.
  • Such a device may allow the antenna to work with waves over a wide frequency band, for example wide enough to cover the FM band.
  • the height of a cage can also be a function of its diameter D.
  • the figure 1 represents a radiation pattern of an antenna mounted on a vertical mast which does not include a decoupling device according to the invention.
  • the antenna used is a dipole, emitting vertical polarization waves, positioned on the radiation pattern at zero degrees and zero dB.
  • the mast is a vertically disposed metal tube whose position corresponds to the center of the radiation pattern.
  • the radiation of the antenna is attenuated by about 7 dB in the direction 180 °, that is to say in the direction of the mast , in the direction of the antenna towards the mast.
  • the Figures 2 to 9 represent a support mast 1, made of an electrically conductive material, substantially vertical and on which are respectively mounted different embodiments of the decoupling device 3 according to the invention.
  • the mast 1 is in the form of a cylindrical tube, of diameter d, made of an electrically conductive material, for example of metal or a metal alloy, preferably of high conductivity, for example greater than 1.10 6 S / m. .
  • the mast 1 could also be in the form of a post, for example of rectangular section, and / or comprise a plurality of support elements, for example a plurality of metal tubes, without this being limited to the scope. of the present invention.
  • the support mast 1 comprises an antenna 2, represented on the Figures 4 to 9 , mounted on the mast 1 by a connecting arm 4 to the right of the decoupling device 3.
  • the antenna 2 is configured to transmit in a frequency band [f 1 , f 2 ], that is to say to transmit waves at frequencies between a low frequency f 1 and a high frequency f 2 , for example itself included in the VHF or UHF bands.
  • the diameter of the mast 1 is advantageously small, preferably less than one tenth of the wavelength ⁇ 0 associated with the center frequency f 0.
  • the diameter of the mast 1 is preferably less than 340 mm, for example between 60 and 125 mm.
  • the figure 2 illustrates a first embodiment of a decoupling device 3 of a mast according to the invention being in the form of a tubular portion 5 made of an electrically conductive material.
  • the tubular portion 5 is open at its upper end and closed at its lower end by a contact ring 6 perpendicular to the mast 1 made of an electrically conductive material and extending over the surface between the mast 1 and the tubular portion 5 of to electrically connect the tubular portion 5 to the mast 1.
  • the tubular portion 5 thus surrounds the tube 1 so as to form a coaxial guide.
  • the sum of the length of the tubular portion 5 and the radial dimension of the ring, between the tubular portion 5 and the mast 1, is of length approximately equal to three tenths of the wavelength ⁇ 0 of the waves emitted by the antenna (not shown) at the center frequency f 0 .
  • the impedance of the coaxial guide formed by the assembly of the mast 1 and the tubular portion 5 is theoretically infinite at point B since it is located at a quarter-wave of a short circuit located at point A.
  • the mast 1 is thus electrically cut at the plane orthogonal to the section of the tube and passing through the point B.
  • Such a decoupling device operates more particularly on cylindrical metal tubes of small section, that is to say whose diameter is less than one tenth of the wavelength associated with the central frequency f 0 , and present, by its operating principle, a frequency selectivity.
  • the frequency selectivity, and thus the efficiency of the blockage of currents induced by waves at frequencies within large bandwidths, is therefore related to the characteristic impedance of the decoupling device which must be as high as possible .
  • the figure 3 illustrates a second embodiment of a decoupling device 3 of a mast according to the invention is in the form of a decoupling element 7 made of an electrically conductive material of length approximately equal to a quarter of the length of wave ⁇ 0/4 of the waves emitted by the antenna (not shown) at the center frequency f 0 .
  • the decoupling element 7 comprises a first portion 9 disposed parallel to the mast 1 and a second portion 11 connecting the first portion 9 to the mast 1 and disposed perpendicularly thereto.
  • the sum of the lengths of the first and the second portion being approximately equal to a quarter of the wavelength ⁇ 0/4 of the waves emitted by the antenna (not shown) at the center frequency f 0 .
  • the decoupling element 7 thus behaves as a short-circuited asymmetric two-wire line where the two conductors, that is to say the mast 1 and the decoupling element 7, are of different cross-sections.
  • the two conductors that is to say the mast 1 and the decoupling element 7 are of different cross-sections.
  • B 'an infinite impedance to f 0 if the path B'A'AB is equal to a quarter of the wavelength ⁇ 0 associated with this frequency f 0 .
  • This type of device less complex than the previous one illustrated in figure 2 , thus has a greater installation flexibility and is more easily adaptable to a mast 1 of larger section, for example with a diameter greater than 125 mm FM band.
  • a decoupling device has a greater frequency selectivity than that of the decoupling device illustrated by FIG. figure 2 .
  • the almost single-frequency nature of the induced electrical blocking can be substantially improved by widening the width of the metal blades constituting the decoupling device.
  • the Figures 4 and 5 each illustrate a mast 1 comprising an antenna 2 and four decoupling devices 3 according to a third embodiment.
  • Antenna 2 illustrated by figure 4 , which is in the form of a doublet dipole dipole 2a vertically disposed parallel to the mast 1, and configured to emit waves polarized substantially vertically omnidirectionally.
  • Antenna 2 illustrated by figure 5 , is in the form of two V-shaped metal elements 2b, generating elliptical polarization waves, each mounted on the link arm 4 and whose planes are substantially orthogonal to each other.
  • the antenna 2 is mounted on the mast 1 by a connecting arm 4 perpendicular to the mast 1.
  • Each decoupling device 3 is in the form of a substantially cylindrical metal cage, of diameter D, comprising twelve decoupling elements in the form of metal rods 17, electrically conductive, bent L-shaped and evenly distributed around it of the mast 1.
  • the cages 3 are mounted superimposed one above the other along the mast 1 and coaxially with it.
  • the distance between the rings 20 of two cages 3 arranged consecutively is less than a quarter of the wavelength ⁇ 2 corresponding to the high frequency f 2 of the frequency band [f 1 , f 2 ] in which the antenna 2 is working.
  • Each rod 17 comprises a first portion 17a disposed vertically, parallel to the mast 1, and a second portion 17b, disposed horizontally, perpendicular to the mast 1 and connecting the lower end of the first portion 17a to the mast 1.
  • the first portion 17a and the second portion 17b are interconnected at a bend 18.
  • the sum of the lengths of the first portion 17a and the second portion 17b is approximately equal to three tenths of the wavelength ⁇ 0 of the waves emitted by the antenna 2 at the center frequency f 0 .
  • the rods 17 are connected together at their respective upper ends 19 by a metal ring 20 allowing an electrical connection between said rods 17 and reinforcing the structure of the decoupling device 3.
  • a second metal ring (not shown) can be arranged to connect the rods 17 at their respective elbows 18 so as to create a second electrical junction between the rods 17 and to further strengthen the structure of the decoupling device 3.
  • the device 3, illustrated by the Figures 4 and 5 thus makes it possible to decouple the antenna 2 and the mast 1 on a relative band of frequencies higher than 20%.
  • the number of metal cages 3 is evaluated so as to restrict the metal support sections contributing to the radiation of the antenna, that is to say the mast portions 1 located between two decoupling devices 3, to length sections less than ⁇ 0/4 .
  • the number of decoupling devices 3 is preferably greater than or equal to four over a metal support length of between ⁇ 0/2 and ⁇ 0 depending on the height h of the metal cages, for example between ⁇ 0/4 and ⁇ 0/8 at the center frequency f 0 .
  • the decoupling device 3 according to the invention can thus be configured to decouple antennas of the double dipole type, such as the half-wave doublet illustrated by FIG. figure 4 but also more generally any grouping of antennas or aerials of dipole or similar type emitting polarization waves at least substantially vertical.
  • the decoupling device 3 according to the invention can thus be configured to decouple V-dipole type antennas as illustrated by FIG. figure 5 .
  • a decoupling device 3 of a mast can also be configured to decouple antennas 2 of the "ground plane" type.
  • such an antenna 2 comprises a monopole 22 of the quarter-wave type placed on a discretized ground plane 24 consisting of a limited to very limited number of metal rods 26, for example four.
  • the ground plane 24 constituted by these rods 26 is not flat but inclined downwards, as illustrated by the Figures 6a to 6e , so as to reduce the main radiation to a site close to 0 ° (horizon line).
  • the decoupling devices 3 may be in the form of cages of substantially frustoconical shape.
  • the cages 3 illustrated by the figure 7 comprise a closed side wall surrounding the mast 1, the ends of the cage 3 being open.
  • the side wall 30 could be perforated or discretized.
  • the solution can of course be discretized in the same manner as described above, the number of metal elements being preferably greater than twelve to ensure optimum performance.
  • the decoupling devices 3 may be in the form of cages consisting of metal decoupling elements 32 of complex shape whose length is between one fifth and one third of the wavelength of the waves emitted by the antenna to the central frequency so as to neutralize the currents induced in the mast by the waves emitted by said antenna.
  • the cage 3 here comprises a second ring 33 connecting the elements of complex shapes at their lower ends so as to form an electrical junction between them.
  • the cages 3 further include one or more element 34 made of a dielectric material completely filling the inside of the cage 3.
  • the use of such a dielectric material reduces the dimensions of the decoupling device 3, in particular in the direction of the height h of the cage. The reduction is carried out on the dimension of each metal cage but not on the spacing between the cages 3.
  • This solution makes it possible to reduce the height of cages of the order of ⁇ r 0.5 , where ⁇ r is the relative permittivity to the inside the cage, but may be more selective in frequency.
  • the Figures 10 and 11 illustrate two radiation patterns of an antenna 2 supported by a mast 1 in a frequency band centered respectively at frequencies 88 and 108 MHz.
  • the curve in solid line illustrates the radiation of an antenna 2 supported by a mast 1 comprising a decoupling device 3 according to the invention and the curve in dashed lines illustrates the radiation of an antenna 2 supported by a mast 1 not including no decoupling device according to the invention.

Landscapes

  • Variable-Direction Aerials And Aerial Arrays (AREA)

Claims (10)

  1. Verfahren zur elektromagnetischen Entkopplung zwischen einem im wesentlichen vertikalen Trägermast (1), der aus einem elektrisch leitenden Material hergestellt ist, und einer Antenne (2), die, zentriert um eine Mittelfrequenz (f0), in einem Frequenzband [f1,f2] Wellen mit wenigstens teilweiser vertikaler Polarisation sendet und die von dem Trägermast (1) getragen wird, dadurch gekennzeichnet, dass die Antenne (2) auf dem Mast (1) mit einem Verbindungsarm (4) montiert ist und dass man auf dem Trägermast (1) zwischen der Antenne (2) und dem Mast (1) wenigstens zwei elektromagnetische Entkoppelungsvorrichtungen (3) anordnet, die wenigstens ein elektrisch leitendes Entkopplungselement (5,7,17) mit einer Länge zwischen einem Fünftel und einem Drittel der Wellenlänge (λ0) der Wellen, die von der Antenne (2) mit der Mittelfrequenz (f0) gesendet werden, wenigsten eine erste Vorrichtung (3) ist auf dem Mast (1) oberhalb des Verbindungsarmes (4) und wenigstens eine zweite Vorrichtung (3) ist auf dem Mast (1) unterhalb des Verbindungsarmes (4) angeordnet, um die von den gesendeten Wellen der Antenne (2) in dem Mast (1) induzierten Ströme zu neutralisieren.
  2. Verfahren nach Anspruch 1, bei dem wenigstens eine Entkopplungsvorrichtung (3) koaxial zu dem Mast (1) angeordnet ist.
  3. Verfahren nach einem der vorstehenden Ansprüche, bei dem wenigstens eine Entkopplungsvorrichtung (3) entlang des Mastes (1) wenigstens auf der Höhe (L) der Antenne (2) angeordnet ist.
  4. Im wesentlichen vertikaler Trägermast (1), der aus einem elektrisch leitenden Material hergestellt ist, und wenigstens eine Antenne (2) aufweist, die, zentriert um eine Mittelfrequenz (f0), in einem Frequenzband [f1,f2] Wellen mit wenigstens teilweiser vertikaler Polarisation sendet, dadurch gekennzeichnet, dass die Antenne (2) auf dem Mast (1) mit einem Verbindungsarm (4) montiert ist, und dass er wenigstens zwei elektromagnetische Entkoppelungsvorrichtungen (3) umfasst, die zwischen der Antenne (2) und dem Mast (1) angeordnet sind, wobei eine erste Vorrichtung (3) auf dem Mast (1) oberhalb des Verbindungsarmes (4) und wenigstens eine zweiten Vorrichtung (3) auf dem Mast (1) unterhalb des Verbindungsarmes (4) angeordnet sind, und wenigstens ein elektrisch leitendes Entkopplungselement (5,7,17) mit einer Länge zwischen einem Fünftel und einem Drittel der Wellenlänge (λ0) der Wellen aufweist, die von der Antenne (2) mit der Mittelfrequenz (f0) gesendet werden, um die von den gesendeten Wellen der Antenne (2) in dem Mast (1) induzierten Ströme zu neutralisieren.
  5. Mast nach Anspruch 4, bei dem sich wenigstens ein Entkopplungselement (5,7,17) parallel zu dem Mast (1) auf einer Länge erstreckt, die ungefähr gleich einem Viertel der Wellenlänge (λ0) der von der Antenne (2) bei der Mittelfrequenz (f0) gesendeten Wellen entspricht.
  6. Mast nach einem der vorstehenden Ansprüche 4 und 5, mit einer Mehrzahl von Entkopplungselementen aus gleichverteilten metallischen Stangen (17), die in Gestalt eines L gebogen sind und jeweils einen vertikal angeordneten ersten Abschnitt (17a) parallel zu dem Mast (1) und einen horizontal rechtwinklig zu dem Mast (1) angeordneten zweiten Abschnitt (17b) aufweisen, der mit dem unteren Ende des ersten Abschnittes (17a) verbunden ist, um eine Kurzschlussverbindung zu bilden.
  7. Mast nach Anspruch 6, dadurch gekennzeichnet, dass wenigstens eine Vorrichtung (3) einen elektrisch leitenden Ring (20) aufweist, der die oberen Enden des ersten Abschnittes (17a) jeder Stange so verbindet, um eine(n) im wesentliche(n) zylindrische(n) Struktur oder Käfig zu bilden, die oder der dazu eingerichtet ist, um koaxial auf dem Trägermast (1) montiert zu werden.
  8. Mast nach Anspruch 7, dadurch gekennzeichnet, dass wenigstens eine Vorrichtung (3) außerdem einen zweiten elektrisch leitenden Ring aufweist, der im Wesentlichen denselben Durchmesser wie der erste Ring (20) aufweist und die Stangen (17) untereinander auf der Höhe ihrer Biegung (18) verbindet.
  9. Mast nach einem der vorstehenden Ansprüche 4 bis 8, wobei der Mast (1) eine Mehrzahl von Entkopplungseinrichtungen (3) aufweist und bei dem die Summe aus der Höhe einer Vorrichtung (3) und aus dem Zwischenraum zwischen der Vorrichtung (3) und einer nachfolgend auf dem Mast (1) angeordneten Vorrichtung (3) kleiner ist als ein Viertel der Wellenlänge (λ2) bei der oberen Frequenz (f2) des Frequenzbandes [f1,f2], in welchem die Antenne (2) arbeitet.
  10. Mast nach einem der vorstehenden Ansprüche 4 bis 9, bei dem die Antenne (2) unidirektional ist und die Form eines Halbwellendipols hat (2a), der vertikal und im Wesentlichen parallel zu dem Mast (1) angeordnet und dazu eingerichtet ist, um Wellen mit im Wesentlichen vertikaler Polarisation zu senden.
EP13756618.8A 2012-07-31 2013-07-29 Verfahren zur elektromagnetischen entkopplung einer antenne und stützmast dafür sowie entsprechender stützmast Not-in-force EP2880712B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1257441A FR2994341B1 (fr) 2012-07-31 2012-07-31 Procede et dispositif de decouplage electromagnetique entre une antenne et son mat de support
PCT/FR2013/051824 WO2014020272A1 (fr) 2012-07-31 2013-07-29 Procédé de découplage électromagnétique entre une antenne et son mât de support et mât de support correspondant

Publications (2)

Publication Number Publication Date
EP2880712A1 EP2880712A1 (de) 2015-06-10
EP2880712B1 true EP2880712B1 (de) 2016-09-07

Family

ID=47178076

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13756618.8A Not-in-force EP2880712B1 (de) 2012-07-31 2013-07-29 Verfahren zur elektromagnetischen entkopplung einer antenne und stützmast dafür sowie entsprechender stützmast

Country Status (3)

Country Link
EP (1) EP2880712B1 (de)
FR (1) FR2994341B1 (de)
WO (1) WO2014020272A1 (de)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2184940A (en) * 1937-07-27 1939-12-26 Emi Ltd Aerial mounting
US4700196A (en) * 1986-08-01 1987-10-13 The United States Of America As Represented By The Secretary Of The Army Highly decoupled cosited antennas

Also Published As

Publication number Publication date
FR2994341B1 (fr) 2015-04-10
EP2880712A1 (de) 2015-06-10
WO2014020272A1 (fr) 2014-02-06
FR2994341A1 (fr) 2014-02-07

Similar Documents

Publication Publication Date Title
FR3068176B1 (fr) Structure antennaire colineaire a acces independants
EP2625741B1 (de) Grossflächige breitband-oberflächenwellenantenne
EP2422403B9 (de) Breitbandige mehrfachantenne mit geringem querschnitt
FR2911725A1 (fr) Antenne ou element d'antenne ultra-large bande.
EP1564842B1 (de) Ultrabreitbandige Antenne
EP1516393B1 (de) Doppelpolarisations-doppelbandstrahlungseinrichtung
FR2903234A1 (fr) Element parasite pour antenne helicoidale.
EP2543111B1 (de) Antennenstruktur mit dipolen
EP1883991A1 (de) Monopolantenne
CA2489776C (fr) Antenne a brins a polarisation circulaire
EP2610966B1 (de) Kompakte Breitbandantenne von sehr geringer Dicke und mit doppelten orthogonalen linearen Polarisierungen, die für den V/UHF-Bandbereich konzipiert ist
FR2849289A1 (fr) Antenne colineaire du type coaxial alterne
EP2880712B1 (de) Verfahren zur elektromagnetischen entkopplung einer antenne und stützmast dafür sowie entsprechender stützmast
EP3227960B1 (de) Selbstkomplementäre mehrschichtige gruppenantenne
FR2987500A1 (fr) Dispositif a bande interdite electromagnetique, utilisation dans un dispositif antennaire et procede de determination des parametres du dispositif antennaire
CA2800949C (fr) Antenne compacte a large bande a double polarisation lineaire
FR2996686A1 (fr) Procede et dispositif de decouplage electromagnetique entre deux systemes d'antennes montes sur un mat de support
FR2518321A1 (fr) Ensemble rayonnant a deux antennes superposees travaillant dans une meme gamme de frequences
EP0850496B1 (de) Sendevorrichtung mit rundstrahlender antenne
WO2016139403A1 (fr) Structure antennaire omnidirectionnelle large bande
EP0778632B1 (de) Gegen verschiedene Entdeckungen geschützter Funkhöhenmesser
CH178703A (fr) Installation de radiocommunication à ondes courtes.
WO1996016453A1 (fr) Antenne de type dipôle demi-onde
WO2010070019A1 (fr) Antenne omnidirectionnelle tres large bande
WO2017025674A1 (fr) Système antennaire à ondes de surface

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

17P Request for examination filed

Effective date: 20150127

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

AX Request for extension of the european patent

Extension state: BA ME

DAX Request for extension of the european patent (deleted)
GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

INTG Intention to grant announced

Effective date: 20160317

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

Free format text: NOT ENGLISH

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

REG Reference to a national code

Ref country code: IE

Ref legal event code: FG4D

Free format text: LANGUAGE OF EP DOCUMENT: FRENCH

REG Reference to a national code

Ref country code: AT

Ref legal event code: REF

Ref document number: 827583

Country of ref document: AT

Kind code of ref document: T

Effective date: 20161015

REG Reference to a national code

Ref country code: DE

Ref legal event code: R096

Ref document number: 602013011182

Country of ref document: DE

REG Reference to a national code

Ref country code: LT

Ref legal event code: MG4D

REG Reference to a national code

Ref country code: NL

Ref legal event code: MP

Effective date: 20160907

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

Ref country code: RS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20160907

Ref country code: LT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20160907

Ref country code: NO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20161207

Ref country code: HR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20160907

Ref country code: FI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20160907

REG Reference to a national code

Ref country code: AT

Ref legal event code: MK05

Ref document number: 827583

Country of ref document: AT

Kind code of ref document: T

Effective date: 20160907

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

Ref country code: NL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20160907

Ref country code: ES

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20160907

Ref country code: LV

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20160907

Ref country code: GR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20161208

Ref country code: SE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20160907

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

Ref country code: RO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20160907

Ref country code: EE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20160907

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

Ref country code: SK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20160907

Ref country code: CZ

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20160907

Ref country code: BG

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20161207

Ref country code: SM

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20160907

Ref country code: PL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20160907

Ref country code: AT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20160907

Ref country code: PT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170109

Ref country code: IS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20170107

REG Reference to a national code

Ref country code: DE

Ref legal event code: R097

Ref document number: 602013011182

Country of ref document: DE

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

Ref country code: IT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20160907

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

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

Ref country code: DK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20160907

26N No opposition filed

Effective date: 20170608

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

Ref country code: SI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20160907

REG Reference to a national code

Ref country code: DE

Ref legal event code: R119

Ref document number: 602013011182

Country of ref document: DE

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20170729

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

Effective date: 20180330

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

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20170729

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20180201

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20170731

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20170731

REG Reference to a national code

Ref country code: IE

Ref legal event code: MM4A

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

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20170731

REG Reference to a national code

Ref country code: BE

Ref legal event code: MM

Effective date: 20170731

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

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20170729

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

Ref country code: IE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20170729

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

Ref country code: BE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20170731

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

Ref country code: MT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20160907

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

Ref country code: AL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20160907

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

Ref country code: MC

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20160907

Ref country code: HU

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT; INVALID AB INITIO

Effective date: 20130729

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

Ref country code: CY

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20160907

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

Ref country code: MK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20160907

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

Ref country code: TR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20160907