EP1524720B1 - Système d'antenne pour plusieurs bandes de fréquences - Google Patents

Système d'antenne pour plusieurs bandes de fréquences Download PDF

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Publication number
EP1524720B1
EP1524720B1 EP04024780A EP04024780A EP1524720B1 EP 1524720 B1 EP1524720 B1 EP 1524720B1 EP 04024780 A EP04024780 A EP 04024780A EP 04024780 A EP04024780 A EP 04024780A EP 1524720 B1 EP1524720 B1 EP 1524720B1
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EP
European Patent Office
Prior art keywords
helix
mhz
antenna
antenna system
antennas
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
EP04024780A
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German (de)
English (en)
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EP1524720A1 (fr
Inventor
Wolf Rathai
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.)
Aeromaritime Systembau GmbH
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Aeromaritime Systembau GmbH
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Priority to SI200431584T priority Critical patent/SI1524720T1/sl
Publication of EP1524720A1 publication Critical patent/EP1524720A1/fr
Application granted granted Critical
Publication of EP1524720B1 publication Critical patent/EP1524720B1/fr
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
    • H01Q1/362—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith for broadside radiating helical antennas
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/27—Adaptation for use in or on movable bodies
    • H01Q1/34—Adaptation for use in or on ships, submarines, buoys or torpedoes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q11/00—Electrically-long antennas having dimensions more than twice the shortest operating wavelength and consisting of conductive active radiating elements
    • H01Q11/02—Non-resonant antennas, e.g. travelling-wave antenna
    • H01Q11/08—Helical antennas
    • 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 invention relates to an antenna system for simultaneous operation in at least two different frequency ranges, in particular for transmitting and receiving in full-duplex operation, in particular for use in submarines.
  • Satellite communications between fixed and moving aeronautical and aeronautical users typically uses antenna structures that exhibit a quasi-hemispherical radiation pattern in circular polarization, in which case the need for a Tracking the antenna system can be avoided to the possibly geostationary satellite systems.
  • the only antenna structure with these required properties is a resonant quadrifilar helix antenna. This usually consists of two double helices that wind around a common longitudinal axis, are mounted orthogonally to each other and are excited by 90 ° phase shift.
  • UHF Satcom satellite communication system where the transmission and reception of data occurs in different frequency ranges: UHF Satcom reception 240-270 MHz UHF Satcom broadcast 290-320 MHz
  • An example of this is an antenna system of a submarine.
  • frequency ranges for satellite communication in the UHF Satcom system even more frequency ranges are usually required beyond this, for example: Shortwave reception 1 - 30 MHz VHF reception (marine radio) 155-160 MHz Line of sight function 225 - 400 MHz GPS 1575.41 / 1227.6 MHz
  • a multi-band antenna system in which an L-band antenna element and an S-band antenna element, each in the form of a quadrifilar helix, spaced from each other on the surface of a hollow cylindrical insulator are arranged.
  • a UHF band antenna element in the form of a cage dipole is arranged inside the insulator.
  • the two quadrifilar helix antenna elements are powered by feed network cards while the UHF antenna is connected to a corresponding feed port via a split-sheath balun.
  • the EP 0 856 906 discloses an antenna for radiotelephones for use in satellite communications.
  • a flexible printed circuit board is formed into a shortened cylindrical bearing on which elements and matching networks are provided to form a helical multi-element antenna.
  • such an antenna system is preferably used on a submarine.
  • a user can benefit from the inventive advantages when operating on conventional ships over water or on land.
  • an antenna system for simultaneous operation in particular for transmitting and receiving in full duplex operation, proposed in at least two different frequency ranges, which in addition to possibly other existing antennas comprises at least two quadrifilar helix antennas, each of which two orthogonal to each other and excited with 90 ° phase shift Double helix has.
  • orthogonal is to be understood that the two double helices of a helical antenna each run with an offset of 90 ° in the direction of rotation about the longitudinal axis of the helical antenna into each other, so that viewed in a radial sectional plane the imaginary connecting lines between the intersections of the respective helices of a double helix the plane orthogonal to each other, such as in FIG. 3 is indicated by the dashed lines.
  • the two helical antennas wind around a common longitudinal axis, wherein they are rotated with respect to this longitudinal axis by an angle of 45 ° to each other.
  • the double helixes of both helix antennas each have the same distance to the longitudinal axis in an arbitrary sectional plane transverse to the longitudinal axis.
  • This special arrangement of the two helical antennas is characterized by a particularly high symmetry, so that according to the invention, the mutual influence of the two antennas is minimized.
  • the respective double helices of the two helical antennas also have the same pitch, whereby the symmetry of the system can be improved even further.
  • the double helices of the two helical antennas are arranged on the lateral surface of a body rotationally symmetrical to the longitudinal axis.
  • a rotationally symmetrical body is in particular a cylinder in question, but other geometric body such as a cone are conceivable.
  • the feeding of the respective helical antenna takes place in a plane extending transversely to the longitudinal axis, which lies at one end of the respective helix.
  • the feed of the respective helical antenna is carried out in the usual way, i. H. that the respective double helices are operated with a phase shift of 90 degrees, wherein the feeding of each single coiled coil via a balancing transformer takes place in the form of a short-circuit line with ⁇ / 4-length.
  • the out of phase feed to generate the circular polarization is preferably done using hybrid couplings or the like.
  • the two feed planes of the two helical antennas coincide.
  • the common feed-in level of both helical antennas may preferably lie at the end of the helix antennas facing the emission direction.
  • the preferably used balancing transformers can be easily accommodated in a symmetrical arrangement inside the helix antennas.
  • the double helices of at least one helix antenna are open at the unexcited end.
  • the respective resonance of the helical antenna can be influenced.
  • the double helices of the two nested helix antennas have a different length, so that the two helix antennas have different resonance frequencies.
  • the two frequency ranges on which the two helix antennas of the antenna system according to the invention can be operated may preferably be the ranges of 210-300 MHz, in particular 240-270 MHz and of 260-350 MHz, in particular 290-320 MHz. to enable sending and receiving in the UHF Satcom system.
  • the two helical antennas of the antenna system according to the invention can preferably be operated simultaneously, d. H. In so-called full-duplex operation, they can also be used in so-called half-duplex mode, in which only one of the two antennas is always in operation.
  • the two helical antennas are of their geometric dimensions, so for example number of turns or pitch of the turns, but in particular from their ratio of diameter to length designed so that the one helical antenna their resonance in the range of 210-300 MHz, in particular 240-270 MHz and the second helical antenna has its resonance in the range of 260-350 MHz, in particular 290-320 MHz, and at the same time for circular (preferably right-polarized) polarized waves an omni-hemispherical radiation characteristic is achieved.
  • the antenna system according to the invention comprises at least one further antenna, which is arranged coaxially to the two helix antennas, preferably in the interior defined by the two helices.
  • This at least one further antenna may, for example, be a monopole radiator, in particular a rod antenna.
  • a monopole radiator in particular a rod antenna.
  • other types of antennas are conceivable as long as a coaxial arrangement, preferably in the interior, of the helix antennas is possible.
  • the most accurate coaxial alignment of the additional antenna in the center of the helix is desirable.
  • the emitters of the additional antenna therefore preferably have a rotationally symmetrical shape.
  • the antenna system according to the invention is in the other antenna to a rod antenna with a roof capacity in the form of a plate, due to their geometric dimensions for receiving in the frequency ranges of 0.5 - 60 MHz and 125 - 190 MHz, in particular can be used in the frequency ranges of 1 - 30 MHz and 155 - 160 MHz.
  • the most symmetrical possible arrangement of the antenna system for a decoupling of the individual antennas from each other is extremely important.
  • a special mechanical structure is provided.
  • the antenna system according to the invention preferably comprises a stable base body, on whose outer surface the double turns of the two helical antennas are fixedly arranged along a longitudinal axis of the base body.
  • the double helices may in this case, for example, have the form of wires which are fastened on the outer surface.
  • bands of an electrically conductive material such as copper bands, which are arranged flat on the outer surface of the base body.
  • the main body is made of any electrically non-conductive material having the desired mechanical properties in terms of stability and / or rigidity.
  • Conceivable here are polymers or other plastics, for example Kapton, Mylar or the like.
  • the main body of the antenna system in the form of a hollow cylinder.
  • the feeding of the helical antennas takes place on an end face of the main body, preferably seen from the attachment side of the antenna system at the distal end and thus at the end facing the direction of irradiation.
  • the feeding of the double helices takes place from a central point, which essentially coincides with the longitudinal axis of the helical antennas and thus the base body, via radially outwardly extending segments of conductive material, which are applied on the front side and respectively to the lead together associated double helices.
  • the foam used preferably has a dielectric constant and a loss factor comparable to those of air.
  • the holder of the corresponding lines in grooves on the lateral surface of separate foam bodies According to the invention, the holder of the corresponding lines in grooves on the lateral surface of separate foam bodies.
  • the lines are held by the foam used over the majority of the length in the interior of the body at a constant distance.
  • this distance is reduced near the feed point on the end face of the base body in order to obtain the best possible symmetrization by the lowest possible transition between the respective feed line and the associated balancing transformer.
  • the entire construction according to the invention is provided with a hood e.g. surrounded by plastic.
  • This plastic hood has a substantially cylindrical shape, which is provided at its distal with respect to the attachment of the antenna system to the submarine hull end with a hemispherical cover and is connected at its proximal end with the hull to be fastened plate.
  • the outer diameter of this plastic hood is determined by the space available during installation. As materials come here, for example, glass fiber reinforced plastic, epoxy resin or the like in question.
  • this plastic hood When used on a normal ship or on land, this plastic hood essentially serves to protect against external environmental influences. Since the requirement of withstand pressure in this case does not exist, For example, the thickness of the hood may be smaller and / or lower requirements may be placed on the material used.
  • FIG. 1 shows a sectional view through an embodiment of an antenna system according to the invention. This comprises two quadrifilar helix antennas 3, 4, which are arranged on the lateral surface of a basic body 1 in the form of a hollow cylinder.
  • a semi-open mounting cylinder 6 is introduced at its proximal relative to the attachment of the antenna system end, the closed end points in the direction of radiation of the antenna system.
  • a circular recess for receiving a mounting plate 5 is provided, which is fastened by means of screws 56 to the mounting cylinder 6.
  • Fig. 2 shows a bottom plan view of the mounting plate 5.
  • the plate 5 In addition to the screw holes 55 for fixing the plate 5 to the mounting cylinder 6, the plate 5, four first terminals 51,52,53,54 for the feed lines of the double helices T0, R0, T90, R90 of both helix antennas 3, 4, to which the respective ones of the hybrid couplings 62 (see Figure 5 ) of the base module of the antenna system coming supply lines can be connected.
  • These cables are conventional coaxial cables.
  • terminal 51,52,53,54 diametrically to the longitudinal axis of the base body 1
  • a terminal 51 a, 52 a, 53 a, 54 a is provided, each of which the end of belonging to the corresponding double helix T0, R0, T90, R90 ⁇ / 4 short-circuit line 8 represents.
  • These total of eight terminals 51,52,53,54,51a, 52a, 53a, 54a are arranged symmetrically at the same angular intervals of 45 degrees on a circular line with a constant distance to the longitudinal axis of the base body 1.
  • coaxial cable 7 extend in the interior of the cylindrical base body in the direction of the distal end of the base body 1 to there first the cover plate 2, with the distal end of the base body 1 is closed in one pierced central area.
  • Fig. 3 is shown, in this case the respective outer conductor of the coaxial cable 7 on the front side of the cover plate 2 with sectors 21,22, 23,24 are connected. These consist of conductive material and lead from the central region in each case radially outward, to feed from there the first coil of the respective double helix T0, R0, T90, R90.
  • the sectors 21,22, 23,24 made of a copper foil, which are applied to the cover plate 2 made of non-conductive material.
  • sectors 21,22,23,24 which are respectively connected to the outer conductors of the corresponding feed lines 7, there are sectors 21a, 22a, 23a, 24a, which also consist of copper foil and radially lead radially from the central region to the outside to feed from there the second coil of the respective double helix T0, R0, T90, R90.
  • the respective inner conductor 7a of the feeders 7 of a double helix T0, R0, T90, R90 as in Fig. 4 shown connected to the respective double helix T0, R0, T90, R90 belonging, diametrically opposed sector 21a, 22a, 23a, 24a and an associated line 8.
  • This line 8 is formed in the present case in each case by the outer conductor of a coaxial cable, which, however, has no inner conductor.
  • the outer conductor of the feed line 7 and the associated line 8 each form a ⁇ / 4 short-circuit line for transforming the unbalanced signal of the feed line 7 into a symmetrical signal at the feed point.
  • the line 8 extends through the cover plate 2 into the interior of the main body 1, traverses it and is conductively connected to the plate 2.
  • this ⁇ / 4 short-circuit line must correspond to a quarter of the wavelength of the resonance frequency of the respective helical antenna 3,4, the position of the plate 5 and thus the geometric dimensions of the mounting cylinder 6 in the interior of the main body first result.
  • the feed lines 7 and the lines 8, starting from the plate 5, are initially supported in the interior of the base body 1 by three cylinders 9 made of foam material aligned with the longitudinal axis of the base body, and separating wheels 10 arranged between these cylinders 9.
  • the cylinders 9 in this case have an identical cross section, wherein the feed lines 7 and the lines 8 are guided in corresponding grooves in the lateral surfaces of the cylinder 9, and in through holes in the cutting discs 10. In this way, the lines 7,8 are held in their symmetrical arrangement with substantially identical distance to the longitudinal axis of the base body 1.
  • the lines 7, 8 are then guided in grooves in the lateral surface of a substantially conical foam body 9 a, which tapers in the direction of the cover plate 2.
  • a further cutting disc 10a with a smaller radius, which in turn has passage openings for the leads through to 7,8.
  • a further cylinder 11 is arranged made of foam, which in turn has grooves in its lateral surface to accommodate the lines to be led by 7.8.
  • a material which preferably has the following physical properties is used as the foam material for the cylinders 9, the conical foam body 9a and the cylinder 11: Density: ⁇ 50 kg / m 3 , in particular ⁇ 35 kg / m 3 dielectric constant: 1.0 - 1.1 for frequencies ⁇ 26.5 GHz Dielectric loss factor: ⁇ 0.002 for frequencies ⁇ 10 GHz
  • a suitable polymethacrylimide (PMI) rigid foam such as Rohacell® 31 is suitable as a commercially available foam material.
  • the cutting discs 10 and 10a are made in the present case of a preferably very rigid material with good breaking strength and suitable dielectric properties. For example, these requirements of polyvinyl chloride (hard PVC) are met.
  • one or more feed lines for additional antennas which may be mounted, for example, on the cover plate 2, can be performed.
  • the double helices T0, R0, T90, R90 of the two helical antennas 3, 4 are formed in the present embodiment in each case by corresponding strips of copper foil, which are wound on the lateral surface of the main body 1. Consequently, in the present case, the respective double helices are open at the ends opposite to the feed.
  • the bands are electrically connected at the transition region between the cover plate 2 and the lateral surface of the base body 1 with the respective sectors 21,21 a, 22,22a, 23,23a, 24,24a of the double helices.
  • the two helical antennas 3, 4 of the antenna system according to the invention can be operated in the two ranges of 240-270 MHz and 290-320 MHz, respectively, so that transmission and reception in the UHF Satcom system is possible. Since a resonance at a lower frequency is associated with a greater length of the corresponding double helices, it turns out Fig. 1 it can be seen that in the present case it is the helix antenna 4 which operates in the range of 240-270 MHz.
  • the two helix antennas 3, 4 in the present embodiment can be operated either in full-duplex mode or in half-duplex mode.
  • the typical gain of the present antenna system with the two helical antennas 3, 4 is typically 0 dBi, but it may also reach 2 dBi become.
  • An omni-hemispheric radiation image is generated in a right-polarized radiation.
  • the antenna impedance is 50 ohms.
  • the maximum operating power 200 W.
  • FIG. 5 shows a detailed view of a sub-area Fig.1 and represents the base portion of the antenna system with the mounting cylinder 6.
  • an additional antenna is housed in the embodiment shown here.
  • This monopole is formed in the present case by a copper ring 63, which is held by means of spacers 64 in a transverse plane of the base body 1 and which is connected directly via an insulated terminal to the base module of the antenna system.
  • the additional rod antenna is used in the present case for reception in the frequency ranges of 1 MHz - 30 MHz and 155 MHz - 160 MHz.
  • the two 90 ° hybrid couplings 62 for generating the phase shift for feeding in the helical antennas 3, 4 are located inside the assembly cylinder 6. These are arranged on a cover body 66 terminating the main body 1, on the outside of which the connections 65 are provided, via which the antenna system is connected to the supply unit (not shown).
  • the hood for protecting the antenna system against environmental influences is formed in the present embodiment of a radome made of glass fiber reinforced epoxy resin whose wall thickness depends on the use of either a submarine or over water or on land.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
  • Burglar Alarm Systems (AREA)
  • Radar Systems Or Details Thereof (AREA)
  • Waveguide Aerials (AREA)
  • Aerials With Secondary Devices (AREA)

Claims (10)

  1. Système d'antennes pour le fonctionnement simultané dans au moins deux plages de fréquences différentes en particulier pour l'envoi et la réception en duplex intégral avec aux moins deux antennes quadrifilaires (3, 4) dont chacune comprend deux doubles hélices (R0, R90, TO, T90) disposées en décalé dans le sens de rotation à 90° entre elles et excitées avec un décalage de phase de 90°,
    - les deux antennes hélicoïdales (3, 4) s'enroulant autour du même axe longitudinal et étant tournées en opposé d'un angle de 45° par rapport à l'angle longitudinal commun et
    - les doubles hélices (R0, R90, TO, T90) des deux antennes hélicoïdales présentant dans n'importe quel plan de coupe transversalement à l'axe longitudinal respectivement la même distance avec l'axe longitudinal,
    caractérisé en ce que l'alimentation de chaque double hélice (R0, R90, TO, T90) s'effectue par une ligne d'alimentation coaxiale (7), l'une des hélices des doubles hélices respectives (R0, R90, TO, T90) étant reliée au conducteur externe de la ligne d'alimentation respective (7) et l'autre hélice étant reliée au conducteur interne (7a) de la ligne d'alimentation (7),
    la symétrisation de chaque double hélice des antennes hélicoïdales (3, 4) s'effectue respectivement par une ligne de court-circuit (8),
    - la ligne de court-circuit (8) étant reliée en commun avec le conducteur interne (7a) à l'autre hélice respective,
    - toutes les lignes d'alimentation (7) et les lignes de court-circuit (8) sont disposées symétriquement dans le sens longitudinal du système d'antennes à la même distance de l'axe longitudinal des antennes hélicoïdales (3, 4),
    - respectivement une ligne d'alimentation (7) et une ligne de court-circuit associée (8) sont diamétralement opposées,
    - les lignes d'alimentation (7) et les lignes de court-circuit (8) sont guidées sensiblement à distance constante de l'axe longitudinal et la distance ne diminue qu'à proximité des points d'alimentation,
    - les lignes d'alimentation (7) et les lignes de court-circuit (8) étant maintenues fixement au moins sur une section par un matériau en mousse expansée (9, 9a, 11) sous forme de corps séparés de matériau en mousse expansée, la fixation des lignes d'alimentation (7) et des lignes de court-circuit (7, 8) s'effectuant dans des rainures sur la surface d'enveloppe des corps séparés de matériau en mousse expansée (9, 9a, 11).
  2. Système d'antennes selon la revendication 1, caractérisé en ce que
    - les doubles hélices (R0, R90, TO, T90) des deux antennes hélicoïdales (3 ,4) sont disposées sur la surface d'enveloppe d'un corps symétrique en rotation par rapport à l'axe longitudinal et
    - en particulier en ce que le corps symétrique en rotation est un cylindre.
  3. Système d'antennes selon l'une des revendications précédentes, caractérisé en ce que
    - l'alimentation de l'antenne hélicoïdale respective (3, 4) s'effectue dans un plan s'étendant transversalement à l'axe longitudinal, plan qui se trouve à une extrémité de l'hélice respective,
    - en particulier que les plans d'alimentation des deux antennes hélicoïdales (3 ,4) coïncident et en ce qu'
    - en particulier le plan d'alimentation commun des deux antennes hélicoïdales (3 ,4) se trouve sur l'extrémité des antennes hélicoïdales (3 ,4), tournée vers la direction de rayonnement.
  4. Système d'antennes selon l'une des revendications précédentes, caractérisé en ce que
    - les doubles hélices (R0, R90, TO, T90) d'au moins une antenne hélicoïdale (3, 4) sont ouvertes à l'extrémité non excitée ou
    - en ce que les doubles hélices (R0, R90, TO, T90) des deux antennes hélicoïdales (3 ,4) présentent la même inclinaison.
  5. Système d'antennes selon l'une des revendications précédentes, caractérisé en ce que
    - les doubles hélices (R0, R90, TO, T90) des deux antennes hélicoïdales (3 ,4) présentent des longueurs différentes de sorte que les antennes hélicoïdales (3 ,4) présentent des fréquences de résonance différentes et
    - en particulier une antenne hélicoïdale (3, 4) a sa résonance dans la plage comprise entre 210 et 300 MHz, en particulier entre 240 et 270 MHz et la seconde antenne hélicoïdale (3, 4) a sa résonance dans la plage comprise entre 260 et 350 MHz, en particulier 290 à 320 MHz.
  6. Système d'antennes selon l'une des revendications précédentes, caractérisé en ce qu'au moins les deux plages de fréquences sont entre autres des fréquences comprises entre 210 et 300 MHz, en particulier entre 240 et 270 MHz et entre 260 et 350 MHz, en particulier entre 290 et 320 MHz.
  7. Système d'antennes selon l'une des revendications précédentes, caractérisé en ce que les deux antennes hélicoïdales (3 ,4) sont réalisées au niveau de leurs dimensions géométriques en particulier leur rapport entre la longueur et le diamètre de sorte qu'elles présentent une caractéristique de rayonnement omni-hémisphérique pour des ondes polarisées circulaires dans le sens horaire.
  8. Système d'antennes selon l'une des revendications précédentes, caractérisé en ce que
    - il existe au moins une autre antenne coaxialement aux deux antennes hélicoïdales (3 ,4) et
    - en particulier l'autre antenne est un émetteur monopolaire, en particulier une antenne à tige (63) qui peut être utilisée en raison de ses dimensions géométriques pour la réception dans les plages de fréquences de 0,5 à 60 MHz et 125 à 190 MHz, en particulier dans les plages de fréquences de 1 à 30 MHz et 155 à 160 MHz.
  9. Système d'antennes selon l'une des revendications précédentes, caractérisé en ce que les corps (9, 9a, 11) en matière de mousse expansée présentent la forme de cylindres et de cônes.
  10. Système d'antennes selon l'une des revendications précédentes, caractérisé en ce qu'entre chacun des corps en matière mousse expansée (9, 9a, 11) sont disposées des plaques (10, 10a) en matériau non flexible, les lignes à maintenir (7, 8) étant guidées par des ouvertures dans ces plaques.
EP04024780A 2003-10-17 2004-10-18 Système d'antenne pour plusieurs bandes de fréquences Not-in-force EP1524720B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SI200431584T SI1524720T1 (sl) 2003-10-17 2004-10-18 Antenski sistem za veäśfrekvenäśne pasove

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10348378A DE10348378A1 (de) 2003-10-17 2003-10-17 Antennensystem für mehrere Frequenzbereiche
DE10348378 2003-10-17

Publications (2)

Publication Number Publication Date
EP1524720A1 EP1524720A1 (fr) 2005-04-20
EP1524720B1 true EP1524720B1 (fr) 2010-12-29

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EP04024780A Not-in-force EP1524720B1 (fr) 2003-10-17 2004-10-18 Système d'antenne pour plusieurs bandes de fréquences

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EP (1) EP1524720B1 (fr)
AT (1) ATE493774T1 (fr)
DE (2) DE10348378A1 (fr)
DK (1) DK1524720T3 (fr)
SI (1) SI1524720T1 (fr)

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Publication number Priority date Publication date Assignee Title
RU2696882C1 (ru) * 2018-07-16 2019-08-07 Дмитрий Витальевич Федосов Резонансная перестраиваемая антенна
CN113839202B (zh) * 2021-08-12 2023-06-23 南京信息工程大学 一种基于肌电信号传输的植入天线

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GB2322011A (en) 1997-02-04 1998-08-12 Ico Services Ltd Antenna and fabrication method
NO993414L (no) * 1998-07-22 2000-01-23 Vistar Telecommunications Inc Integrert antenne
US6545649B1 (en) 2001-10-31 2003-04-08 Seavey Engineering Associates, Inc. Low backlobe variable pitch quadrifilar helix antenna system for mobile satellite applications

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ATE493774T1 (de) 2011-01-15
DE502004012049D1 (de) 2011-02-10
DK1524720T3 (da) 2011-04-04
EP1524720A1 (fr) 2005-04-20
SI1524720T1 (sl) 2011-02-28
DE10348378A1 (de) 2005-05-19

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