EP1010214B1 - Antenna for orbiting satellite - Google Patents
Antenna for orbiting satellite Download PDFInfo
- Publication number
- EP1010214B1 EP1010214B1 EP98917183A EP98917183A EP1010214B1 EP 1010214 B1 EP1010214 B1 EP 1010214B1 EP 98917183 A EP98917183 A EP 98917183A EP 98917183 A EP98917183 A EP 98917183A EP 1010214 B1 EP1010214 B1 EP 1010214B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- antenna
- satellite
- elementary
- antennas
- radiating elements
- 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
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
- H01Q3/26—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture
- H01Q3/30—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture varying the relative phase between the radiating elements of an array
-
- 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
- H01Q21/00—Antenna arrays or systems
- H01Q21/06—Arrays of individually energised antenna units similarly polarised and spaced apart
- H01Q21/061—Two dimensional planar arrays
- H01Q21/067—Two dimensional planar arrays using endfire radiating aerial units transverse to the plane of the array
Definitions
- the present invention relates to antennas for scrolling satellites.
- the antennas used by scrolling satellites are either type antennas omnidirectional (SPOT, ERS, etc.) or directive pointable (LANDSAT, etc).
- the beam is Gaussian and scanning is carried out using a pointing, the antenna behaving like a Classic design centered parabolic reflector.
- Document US 5,587,719 describes an assembly of antennas for satellite to communication comprising several aligned elementary helical antennas along their longitudinal axis.
- Each elementary antenna includes four strands regularly distributed in a helix around a cylindrical generator.
- antennas having a winding of their strands in one direction given are inserted between antennas with a winding in direction opposite.
- An object of the invention is to propose a antenna for traveling satellite which does not require no pointing mechanism, which has a gain superior to omni-directional antennas and that is space-saving and low cost.
- the invention proposes a system according to claim 1.
- the beam emission beam is an elliptical beam ("fan beans” according to Anglo-Saxon terminology) which extends in a direction parallel to that of the vector satellite speed.
- the antenna illustrated in Figure 1 has a plurality of elementary radiating elements referenced by 1.
- These elementary radiating elements 1 each have a plurality of helical strands regularly distributed around the same generator revolution.
- the generator is for example conical or cylindrical. These strands are supplied in an equi-amplitude manner.
- these strands there are four of these strands and define four identical propellers, offset by ⁇ / 2 relative to each other. These four strands are advantageously supplied with phase quadrature.
- the angular radiation pattern of such elementary radiant element is of the type illustrated in figure 2.
- This diagram corresponds to the diagram obtained for an axial height of the radiating element of 0.050 m, a basic radius of 0.018 m, as well as a frequency 8000 MHz transmission. It is related to a sphere of measures 10 m in diameter.
- the elementary radiating elements 1 are distributed in line in a plane perpendicular to the direction of the velocity vector.
- the pitch between said radiating elements 1 is by example of 19 mm for an emission frequency of 8000 MHz, which eliminates the need for network lobes.
- the pitch d of the network is such that d ⁇ / (1 + sin ⁇ ) where ⁇ is the wavelength of the radiation, and ⁇ the maximum depointing desired.
- the radiating elements 1 are supplied via phase shifters 2 of ferrite type and couplers 3, by a power distributor 6 (in this case 1: 5), which is for example of the waveguide type.
- phase shifters 2 are controlled by a unit 4, which is the satellite on-board computer, to which they are linked by control electronics 5.
- phase shifts imposed on the different elements 1 radiators are used to make the depointings desired, up to ⁇ 62 °.
- the choice for radiating elements 1 of propeller structure provides a gain at 50 ° 2 dB higher than the gain presented at 0 ° (excluding the space attenuation difference compensation -62 ° satellite lift from the zenith) and therefore naturally compensate for the loss of depointing.
- the optimal number of radiating element elementary will vary from five to twelve depending on mission needs.
- the phase shifters 2 for example have steps of 22.5 ° quantization and are coded on 4 bits.
- the beams generated by such an antenna are elliptical (major axis of ellipses parallel to the trace satellite).
- the cover is shown obtained in the case of phase shifts respectively of a radiating element from one end to the other at 90 °, 45 °, 0 °, - 45 ° and -90 °.
- the diagram is then deviated by + 18 °.
- the directivity is 11.52 dB.
- the depointing is then 32 °, the directivity 11.49 dB.
- the depointing obtained is 48 °, the directivity 11.45 dB maximum.
- the directivity obtained at 65 ° is greater than 9-dB, or a gain greater than 7.5 dB if we consider losses of 0.5 dB on the distributors, of 0.5 dB for phase shifters, 0.25 dB at the connection and 0.25 dB at the power supply.
- the depointing antenna which has just been described allows high ground retransmission rates and allows retransmissions of High resolution images.
- Beam switching takes place preferably before passage, so as to avoid phase jump problems on the generated coverage.
- the depointing antenna which has just been described has the advantage of being low cost and above all small footprint.
- the size of the part radiant is 90mm in length, 5mm in width and 50 mm in height.
- the antenna comprises several online antennas of the type which has just been describes and switching means for switch from one online antenna to another depending movements of the satellite, and in particular of its roll movements.
- the antenna includes means for motorization which allow to modify the orientation of the line (s) of elementary radiating elements to compensate for potential movements of the satellite, especially its rolling movements.
Abstract
Description
La présente invention est relative aux antennes pour satellites à défilement.The present invention relates to antennas for scrolling satellites.
A ce jour, les antennes utilisées par les satellites à défilement sont soit des antennes de type omnidirectionnel (SPOT, ERS, etc) soit de type directif pointable (LANDSAT, etc).To date, the antennas used by scrolling satellites are either type antennas omnidirectional (SPOT, ERS, etc.) or directive pointable (LANDSAT, etc).
Dans ce dernier cas, le faisceau est gaussien et le balayage est réalisé à l'aide d'un mécanisme de pointage, l'antenne se comportant quant à elle comme un réflecteur parabolique centré de conception classique.In the latter case, the beam is Gaussian and scanning is carried out using a pointing, the antenna behaving like a Classic design centered parabolic reflector.
Le document US 5 587 719 décrit un assemblage d'antennes pour satellite à communication comprenant plusieurs antennes hélicoïdales élémentaire alignées selon leur axe longitudinal. Chaque antenne élémentaire comprend quatre brins répartis régulièrement en hélice autour d'une génératrice cylindrique. Dans cet assemblage, des antennes présentant un enroulement de leurs brins dans un sens donné sont intercalées entre des antennes présentant un enroulement en sens opposé.Document US 5,587,719 describes an assembly of antennas for satellite to communication comprising several aligned elementary helical antennas along their longitudinal axis. Each elementary antenna includes four strands regularly distributed in a helix around a cylindrical generator. In this assembly, antennas having a winding of their strands in one direction given are inserted between antennas with a winding in direction opposite.
L'article de W.A. Imbriale et al. « An S-band phased array for multiple access communications » décrit un réseau d'antennes destiné à être installé sur un satellite pour bande S et émettant un faisceau sensiblement omnidirectionnel.The article by W.A. Imbriale et al. "An S-band phased array for multiple access communications ”describes an antenna network intended to be installed on a S band satellite transmitting a substantially omnidirectional beam.
Un but de l'invention est de proposer une antenne pour satellite à défilement qui ne nécessite aucun mécanisme de pointage, qui présente un gain supérieur aux antennes omnidirectionnelles et qui est peu encombrante et d'un faible coût.An object of the invention is to propose a antenna for traveling satellite which does not require no pointing mechanism, which has a gain superior to omni-directional antennas and that is space-saving and low cost.
A cet effet, l'invention propose
un système selon la revendication 1.To this end, the invention proposes
a system according to
On notera qu'avec une telle répartition d'antennes élémentaires à diagramme formé, le faisceau d'émission réalisé est un faisceau de type elliptique ("fan beans" selon la terminologie anglo-saxonne) qui s'étend dans une direction parallèle à celle du vecteur vitesse du satellite.Note that with such a distribution elementary antennas with a formed diagram, the beam emission beam is an elliptical beam ("fan beans" according to Anglo-Saxon terminology) which extends in a direction parallel to that of the vector satellite speed.
Le dépointage de ce faisceau sur une longitude donnée permet d'atteindre, pendant tout le temps de passage d'un satellite, une station se trouvant à cette longitude, et ce sans avoir besoin de modifier ce dépointage au fur et à mesure que le satellite avance.The depointing of this beam on a longitude given achieves, during all the time of passage of a satellite, a station being at this longitude, without having to modify this depointing as the satellite advances.
On comprend qu'une telle structure d'antenne ne nécessite pas une électronique compliquée et permet des hauts débits de transmission.It is understood that such an antenna structure does not not require complicated electronics and allows high transmission rates.
Cette antenne est avantageusement complétée par les différentes caractéristiques suivantes prises seules ou selon toutes leurs combinaisons possibles :
- le nombre d'éléments rayonnants élémentaires est égal ou supérieur à cinq ;
- les éléments rayonnants élémentaires sont décalés les uns par rapport aux autres avec un pas choisi de façon à éviter les lobes de réseaux ;
- pour une fréquence d'émission à 8000 MHz, le pas entre deux antennes élémentaires est de l'ordre de 19 mm ;
- les moyens de déphasage sont codés sur 3 à 8-bits ;
- les moyens de déphasage sont du type à ferrite.
- the number of elementary radiating elements is equal to or greater than five;
- the elementary radiating elements are offset with respect to each other with a pitch chosen so as to avoid the lobes of networks;
- for a transmission frequency at 8000 MHz, the pitch between two elementary antennas is of the order of 19 mm;
- the phase shift means are coded on 3 to 8-bits;
- the phase shifting means are of the ferrite type.
D'autres caractéristiques et avantages de l'invention ressortiront encore de la description qui suit. Cette description est purement illustrative et non limitative. Elle doit être lue en regard des dessins annexés sur lesquels :
- la figure 1 est une représentation schématique illustrant une antenne conforme à un mode de réalisation de l'invention ;
- la figure 2 est un graphe sur lequel on a porté le diagramme d'un élément rayonnant élémentaire de l'antenne de la figure 1 ;
- les figures 3 à 6 illustrent différents diagrammes de couvertures obtenus avec l'antenne de la figure 1.
- Figure 1 is a schematic representation illustrating an antenna according to an embodiment of the invention;
- FIG. 2 is a graph on which the diagram of an elementary radiating element of the antenna of FIG. 1 has been plotted;
- Figures 3 to 6 illustrate different cover diagrams obtained with the antenna of Figure 1.
L'antenne illustrée sur la figure 1 comporte une pluralité d'éléments rayonnants élémentaires référencés par 1.The antenna illustrated in Figure 1 has a plurality of elementary radiating elements referenced by 1.
Ces éléments rayonnants élémentaires 1
comportent chacun une pluralité de brins hélicoïdaux
répartis régulièrement autour d'une même génératrice de
révolution. La génératrice est par exemple conique ou
cylindrique. Ces brins sont alimentés de façon équi-amplitude.These elementary
Par exemple, ces brins sont au nombre de quatre et définissent quatre hélices identiques, décalées de π/2 les unes par rapport aux autres. Ces quatre brins sont avantageusement alimentés en quadrature de phase.For example, there are four of these strands and define four identical propellers, offset by π / 2 relative to each other. These four strands are advantageously supplied with phase quadrature.
Le diagramme angulaire de rayonnement d'un tel élément rayonnant élémentaire est du type de celui illustré sur la figure 2.The angular radiation pattern of such elementary radiant element is of the type illustrated in figure 2.
Ce diagramme correspond au diagramme obtenu pour une hauteur axiale d'élément rayonnant de 0,050 m, un rayon de base de 0,018 m, ainsi qu'une fréquence d'émission de 8000 MHz. Il est rapporté à une sphère de mesure de 10 m de diamètre.This diagram corresponds to the diagram obtained for an axial height of the radiating element of 0.050 m, a basic radius of 0.018 m, as well as a frequency 8000 MHz transmission. It is related to a sphere of measures 10 m in diameter.
On notera que les éléments rayonnants élémentaires à plusieurs brins en hélice présentent, comme on le verra plus loin, l'avantage de présenter plus de gains à 50° qu'à 0° et donc de permettre de compenser les pertes de dépointage.It will be noted that the radiating elements elementary with several helical strands present, as will be seen below, the advantage of presenting more gains at 50 ° than at 0 ° and therefore allow to compensate for the loss of depointing.
Les éléments rayonnants élémentaires 1 sont
répartis en ligne dans un plan perpendiculaire à la
direction du vecteur vitesse.The elementary
Ils sont disposés de façon que leurs axes soient
parallèles, dans un même plan et espacés régulièrement.
Le pas entre lesdits éléments rayonnants 1 est par
exemple de 19 mm pour une fréquence d'émission de 8000
MHz, ce qui permet de ne pas avoir de lobes de réseau.They are arranged so that their axes are
parallel, in the same plane and regularly spaced.
The pitch between said
De façon plus générale, le pas d du réseau est
tel que
Les éléments rayonnants 1 sont alimentés via des
déphaseurs 2 de type à ferrite et des coupleurs 3, par
un répartiteur de puissance 6 (en l'occurrence 1:5), qui
est par exemple de type guide d'onde.The
Les déphaseurs 2 sont commandés par une unité 4,
qui est le calculateur de bord du satellite, à laquelle
ils sont reliés par une électronique de commande 5.The
L'utilisation des déphaseurs de type à ferrite présente l'avantage de permettre de conserver toujours le même dépointage. La consommation de l'électronique de commande est alors limitée.The use of ferrite type phase shifters has the advantage of allowing to always keep the same depointing. The consumption of electronics order is then limited.
Les déphasages imposés aux différents éléments
rayonnants 1 permettent de réaliser les dépointages
souhaités, et ce jusqu'à ± 62°.The phase shifts imposed on the
Le choix pour les éléments rayonnants 1 d'une
structure à hélice permet de disposer d'un gain à 50°
supérieur de 2 dB au gain présenté à 0° (hors terme de
compensation de différence d'atténuation d'espace -62°
lever satellite par rapport au zénith) et donc de
compenser naturellement les pertes de dépointage.The choice for radiating
Le nombre optimal d'élément rayonnant élémentaire variera de cinq à douze en fonction des besoins de la mission.The optimal number of radiating element elementary will vary from five to twelve depending on mission needs.
Les déphaseurs 2 présentent par exemple des pas
de quantification de 22,5° et sont codés sur 4 bits.The
Les faisceaux générés par une telle antenne sont elliptiques (grand axe des ellipses parallèle à la trace du satellite). The beams generated by such an antenna are elliptical (major axis of ellipses parallel to the trace satellite).
On a illustré sur la figure 3 la couverture obtenue avec l'antenne qui vient d'être décrite, dans le cas d'un déphasage nul entre les différents éléments rayonnants 1.The cover has been illustrated in Figure 3 obtained with the antenna which has just been described, in the case of zero phase shift between the different elements radiant 1.
Il n'y a alors pas de dépointage et la directivité maximale de l'antenne est de 11,55 dB.There is then no depointing and the Maximum directivity of the antenna is 11.55 dB.
Sur la figure 4, on a représenté la couverture obtenue dans le cas de déphasages respectivement d'un élément rayonnant d'extrémité 1 à l'autre de 90°, 45°, 0°, - 45° et -90°.In Figure 4, the cover is shown obtained in the case of phase shifts respectively of a radiating element from one end to the other at 90 °, 45 °, 0 °, - 45 ° and -90 °.
Le diagramme est alors dépointé de + 18°. La directivité est 11,52 dB.The diagram is then deviated by + 18 °. The directivity is 11.52 dB.
Sur la figure 5, on a illustré la couverture obtenue dans le cas d'un déphasage respectivement de 180°, 90°, 0°, - 90°, -180°.In Figure 5, the cover is illustrated obtained in the case of a phase shift of 180 °, 90 °, 0 °, - 90 °, -180 °.
Le dépointage est alors de 32°, la directivité de 11,49 dB.The depointing is then 32 °, the directivity 11.49 dB.
Sur la figure 6, enfin, on a représenté la couverture obtenue respectivement pour des déphasages de 270°, 135°, 0°, - 135° et -270°.In FIG. 6, finally, the coverage obtained respectively for phase shifts of 270 °, 135 °, 0 °, - 135 ° and -270 °.
Le dépointage obtenu est de 48°, la directivité maximale de 11,45 dB.The depointing obtained is 48 °, the directivity 11.45 dB maximum.
Sur ces différentes figures 3 à 6, les cercles représentés en traits pointillés correspondent aux cercles de visibilité respectivement à ± 60° et ± 65°.In these different figures 3 to 6, the circles represented in dotted lines correspond to visibility circles at ± 60 ° and ± 65 ° respectively.
On note que, d'un diagramme à l'autre, la directivité maximale n'évolue que très peu (11,54 dB à 11,45dB).We note that, from one diagram to another, the maximum directivity changes very little (11.54 dB at 11,45dB).
La directivité obtenue à 65° est supérieure à 9-dB, soit un gain supérieur à 7,5 dB si l'on considère des pertes de 0,5 dB sur les répartiteurs, de 0,5 dB pour les déphaseurs, de 0,25 dB au niveau de la connectique et de 0,25 dB au niveau de l'alimentation.The directivity obtained at 65 ° is greater than 9-dB, or a gain greater than 7.5 dB if we consider losses of 0.5 dB on the distributors, of 0.5 dB for phase shifters, 0.25 dB at the connection and 0.25 dB at the power supply.
L'antenne à dépointage qui vient d'être décrite permet des débits de retransmission au sol importants et permet des retransmissions d'images Haute résolution. The depointing antenna which has just been described allows high ground retransmission rates and allows retransmissions of High resolution images.
La commutation du faisceau s'effectue préférentiellement avant passage, de façon à éviter les problèmes de saut de phase sur la couverture générée.Beam switching takes place preferably before passage, so as to avoid phase jump problems on the generated coverage.
Dans le cas où le diagramme antenne ne compense pas l'atténuation d'espace, on peut envisager des changements de vitesse de transmission pour utiliser au mieux les gains de l'antenne dans les zones proches du passage au zénith.In case the antenna diagram does not compensate not space attenuation, we can consider transmission speed changes to use at better the antenna gains in areas close to the passage to the zenith.
L'antenne à dépointage qui vient d'être décrite présente l'avantage d'être d'un faible coût et surtout d'un faible encombrement. L'encombrement de la partie rayonnante est de 90mm en longueur, de 5 mm en largeur et de 50 mm en hauteur.The depointing antenna which has just been described has the advantage of being low cost and above all small footprint. The size of the part radiant is 90mm in length, 5mm in width and 50 mm in height.
Avantageusement encore, l'antenne comporte plusieurs antennes en ligne du type qui vient d'être décrit et des moyens de commutation permettant de basculer d'une antenne en ligne à une autre en fonction des mouvements du satellite, et notamment de ses mouvements de roulis.Advantageously also, the antenna comprises several online antennas of the type which has just been describes and switching means for switch from one online antenna to another depending movements of the satellite, and in particular of its roll movements.
En variante, l'antenne comporte des moyens de motorisation qui permettent de modifier l'orientation de la (ou des) ligne(s) d'éléments rayonnants élémentaires pour compenser les mouvements potentiels du satellite, notamment ses mouvements de roulis.Alternatively, the antenna includes means for motorization which allow to modify the orientation of the line (s) of elementary radiating elements to compensate for potential movements of the satellite, especially its rolling movements.
Claims (8)
- System comprising an orbiting satellite and an antenna for retransmitting to the ground images collected by image-capture instruments of said satellite, characterized in that said antenna comprises a plurality of elementary radiating antennas (1) of the type having a plurality of cords regularly distributed in a helix about one and the same generatrix of revolution as well as means for the equi-amplitude power supply of the various cords, in that the axes of the various elementary antennas are parallel and are aligned in the same plane in which they are regularly spaced, and in that the plane in which these various elementary antennas are distributed is intended, when the satellite is in orbit, to be perpendicular to the direction of the speed vector of the satellite and in that the antenna also comprises means (2) for phase-shifting the power supply to these various elementary antennas which are able to carry out electronic steering of the elongate beam generated by the said elementary antennas.
- System according to claim 1, characterized in that the number of elementary radiating elements (1) is equal to or greater than five.
- System according to one of the preceding claims, characterized in that the elementary radiating elements (1) are staggered one with respect to another with a spacing which is chosen so as to avoid the grating lobes.
- System according to claim 3, characterized in that, for a transmission frequency of 8000 MHz, the spacing between two elementary radiating elements is of the order of 19 mm.
- System according to one of the preceding claims, characterized in that the phase-shifting means are coded over three to eight bits.
- System according to one of the preceding claims, characterized in that the phase-shifting means (2) are of the ferrite type.
- System characterized in that the antenna comprises several in-line antennas according to one of the preceding claims and switching means making it possible to switch over from one in-line antenna to another as a function of the movements of the satellite, and in particular of its roll movements.
- System according to one of claims 1 to 6, characterized in that the antenna comprises motorization means which make it possible to modify the orientation of the line or lines of elementary radiating elements so as to compensate for the potential movements of the satellite, in particular its roll movements.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR9703250 | 1997-03-17 | ||
| FR9703250A FR2760900B1 (en) | 1997-03-17 | 1997-03-17 | ANTENNA FOR SCROLL SATELLITE |
| PCT/FR1998/000535 WO1998042042A1 (en) | 1997-03-17 | 1998-03-17 | Antenna for orbiting satellite |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1010214A1 EP1010214A1 (en) | 2000-06-21 |
| EP1010214B1 true EP1010214B1 (en) | 2003-08-20 |
Family
ID=9504893
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP98917183A Expired - Lifetime EP1010214B1 (en) | 1997-03-17 | 1998-03-17 | Antenna for orbiting satellite |
Country Status (8)
| Country | Link |
|---|---|
| US (1) | US6252562B1 (en) |
| EP (1) | EP1010214B1 (en) |
| JP (1) | JP2001516536A (en) |
| AT (1) | ATE247871T1 (en) |
| CA (1) | CA2284872A1 (en) |
| DE (1) | DE69817373T2 (en) |
| FR (1) | FR2760900B1 (en) |
| WO (1) | WO1998042042A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7015871B2 (en) | 2003-12-18 | 2006-03-21 | Kathrein-Werke Kg | Mobile radio antenna arrangement for a base station |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE516105C2 (en) * | 1999-06-11 | 2001-11-19 | Allgon Ab | A method for controlling the radiation pattern of an antenna, antenna system and radio communication device |
| FR2810456B1 (en) * | 2000-06-20 | 2005-02-11 | Mitsubishi Electric Inf Tech | RECONFIGURABLE ANTENNA DEVICE FOR TELECOMMUNICATION STATION |
| FR2839207B1 (en) * | 2002-04-29 | 2004-07-16 | Chelton Antennas | BROADBAND PASSIVE TUNABLE ANTENNA |
| US6806845B2 (en) * | 2003-01-14 | 2004-10-19 | Honeywell Federal Manufacturing & Technologies, Llc | Time-delayed directional beam phased array antenna |
| US6784458B1 (en) * | 2003-04-14 | 2004-08-31 | Harvatek Corp. | Random partitionable dot matrix LED display |
| FR2976749B1 (en) * | 2011-06-16 | 2013-06-28 | Astrium Sas | DEVICE AND METHOD FOR OPTIMIZING THE FLOOR COVERAGE OF A HYBRID SPATIAL SYSTEM. |
| US10199711B2 (en) | 2015-05-13 | 2019-02-05 | The Arizona Board Of Regents On Behalf Of The University Of Arizona | Deployable reflector antenna |
| EP3322999A4 (en) * | 2015-07-16 | 2019-03-20 | Arizona Board of Regents on behalf of the University of Arizona | Phased array line feed for reflector antenna |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5587719A (en) * | 1994-02-04 | 1996-12-24 | Orbital Sciences Corporation | Axially arrayed helical antenna |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4989011A (en) * | 1987-10-23 | 1991-01-29 | Hughes Aircraft Company | Dual mode phased array antenna system |
| US5041842A (en) * | 1990-04-18 | 1991-08-20 | Blaese Herbert R | Helical base station antenna with support |
| US5258771A (en) * | 1990-05-14 | 1993-11-02 | General Electric Co. | Interleaved helix arrays |
| US5345248A (en) * | 1992-07-22 | 1994-09-06 | Space Systems/Loral, Inc. | Staggered helical array antenna |
| US5986619A (en) * | 1996-05-07 | 1999-11-16 | Leo One Ip, L.L.C. | Multi-band concentric helical antenna |
-
1997
- 1997-03-17 FR FR9703250A patent/FR2760900B1/en not_active Expired - Fee Related
-
1998
- 1998-03-17 AT AT98917183T patent/ATE247871T1/en not_active IP Right Cessation
- 1998-03-17 DE DE69817373T patent/DE69817373T2/en not_active Expired - Lifetime
- 1998-03-17 JP JP54020198A patent/JP2001516536A/en active Pending
- 1998-03-17 EP EP98917183A patent/EP1010214B1/en not_active Expired - Lifetime
- 1998-03-17 WO PCT/FR1998/000535 patent/WO1998042042A1/en active IP Right Grant
- 1998-03-17 CA CA002284872A patent/CA2284872A1/en not_active Abandoned
- 1998-03-17 US US09/381,537 patent/US6252562B1/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5587719A (en) * | 1994-02-04 | 1996-12-24 | Orbital Sciences Corporation | Axially arrayed helical antenna |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7015871B2 (en) | 2003-12-18 | 2006-03-21 | Kathrein-Werke Kg | Mobile radio antenna arrangement for a base station |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2760900A1 (en) | 1998-09-18 |
| US6252562B1 (en) | 2001-06-26 |
| CA2284872A1 (en) | 1998-09-24 |
| DE69817373D1 (en) | 2003-09-25 |
| EP1010214A1 (en) | 2000-06-21 |
| JP2001516536A (en) | 2001-09-25 |
| FR2760900B1 (en) | 1999-05-28 |
| DE69817373T2 (en) | 2004-06-09 |
| ATE247871T1 (en) | 2003-09-15 |
| WO1998042042A1 (en) | 1998-09-24 |
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