WO2013124323A1 - Low-band antenna capable of being positioned on a high-band array antenna so as to form a dual frequency-band antenna system - Google Patents
Low-band antenna capable of being positioned on a high-band array antenna so as to form a dual frequency-band antenna system Download PDFInfo
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- WO2013124323A1 WO2013124323A1 PCT/EP2013/053387 EP2013053387W WO2013124323A1 WO 2013124323 A1 WO2013124323 A1 WO 2013124323A1 EP 2013053387 W EP2013053387 W EP 2013053387W WO 2013124323 A1 WO2013124323 A1 WO 2013124323A1
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- low
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
- H01Q9/0414—Substantially flat resonant element parallel to ground plane, e.g. patch antenna in a stacked or folded configuration
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- 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
- H01Q21/065—Patch antenna array
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- 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
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- 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
- H01Q5/42—Imbricated or interleaved structures; Combined or electromagnetically coupled arrangements, e.g. comprising two or more non-connected fed radiating elements using two or more imbricated arrays
Definitions
- Antenna band low able to be positioned on a high band antenna network so as to form a antennal system dual band frequency
- the present invention relates to a low-band antenna capable of operating in a first frequency band centered on a first low-frequency frequency, and able to be positioned on a high band network antenna so as to form a two-band antennal system, and thus an antenna system dual-band frequency associated.
- the invention lies in the field of antennal two-band frequency systems.
- antennas covering various frequency bands are used, ranging from UHF and VHF waves to the waves. millimeter.
- a known solution consists in associating a high band antenna type band antenna antenna with a dipole-type low band antenna, using the metal plane of the high band antenna as a reflective plane.
- the dipole type antennas have a large footprint.
- a two-band antennal frequency system consists of a network antenna pavers or radiating elements printed above which is fixed a low band antenna consisting of cobblestones or radiating elements.
- This antenna system dual-band frequency has a smaller footprint than a system comprising a low band antenna type dipoles.
- this antennal system has the disadvantage of being designed in a fixed manner for operation in dual frequency band.
- it is useful, for certain applications, to allow both the dual frequency band operation and the single band operation, while maintaining the small size of the antenna system, and with a low complexity to switch from the dual operating mode. -band to single-band operation mode and vice versa.
- the invention proposes a low band antenna capable of operating in a first frequency band centered on a first low frequency frequency, comprising at least a first radiating element, able to be positioned on a high band network antenna operating in a a second frequency band centered on a second frequency called high frequency, said high frequency being strictly greater than said low frequency, so as to form a two-band frequency antennal system, said high band antenna comprising a network of second radiating elements providing each electromagnetic radiation.
- the low band antenna is remarkable in that it is able to use the high band antenna as a reflective plane in the antennary two-band frequency system and in that each first radiating element comprises perforations whose shape is dependent. of the shape of the second radiating elements, the shape of the perforations being determined so as to propagate the electromagnetic radiation of each second radiating element without disturbance, allowing the high band antenna to operate without disturbance in said second frequency band in the presence or in the absence of the low band antenna.
- the low band antenna according to the invention is designed in such a way as not to disturb the operation of the high band network antenna, whether or not it is positioned in the antennal two-band frequency system.
- the antennal system thus obtained with a conventional high-frequency network antenna and a low-frequency antenna according to the invention is modular, it can both operate in frequency bi-band when the two antennas are in place, or at the high frequency only. when the low band antenna is removed.
- the implementation of the antennary dual-band frequency system is both simple and inexpensive, since the high-band antenna antenna used is a conventional antenna, which undergoes no modification to operate with a low-band antenna.
- the low band antenna according to the invention may have one or more of the following characteristics, taken independently or in combination:
- said high frequency is greater than or equal to twice said low frequency;
- the shape and the surface of a said first radiating element is determined as a function of the size of the second radiating elements and of the said low frequency;
- each second radiating element comprises a support for the first radiating element or elements in material capable of propagating the electromagnetic radiation of each second radiating element without disturbance, said support having a predetermined thickness, less than or equal to a maximum value equal to the maximum distance over which each second radiating element radiates in tubular mode;
- said support consists of foam with cavities, the cells being placed opposite the second radiating elements when the low band antenna is positioned on the high band antenna to form a two-band antenna system of frequency;
- a supply circuit positioned on one side of said support, situated opposite the face of said support on which said first radiating elements are positioned, said supply circuit being positioned so as to be implanted, when the the low band antenna is positioned on the high band network antenna to form a two-band antenna system of frequency, between said second radiating elements;
- said at least one first radiating element is formed as a printed circuit on a dielectric sheet
- said at least one first radiating element is composed of a metal mesh.
- the invention relates to a two-band frequency antenna system, comprising a low band antenna capable of operating in a first frequency band centered on a first low frequency frequency, comprising at least a first radiating element, such as only briefly described above, and a high band network antenna operating in a second frequency band centered on a second frequency called high frequency, said high frequency being strictly greater than said low frequency.
- the two-band antennal system is notable in that said low band antenna is removable, the removal of said low band antenna not interfering with the operation of the high band antenna in said second frequency band.
- the high frequency is greater than or equal to twice said low frequency.
- FIG 1 is a schematic view of a two-band antennal system according to one embodiment of the invention.
- FIG. 2 diagrammatically represents the shape of an electromagnetic radiation
- FIG. 3 is an exploded perspective view of a baseband antenna according to one embodiment of the invention.
- FIG. 4 is a view from above of a first radiating element according to a first embodiment of the invention.
- FIG 5 is a perspective view of a first radiating element according to a second embodiment of the invention.
- a dual frequency band antenna system 10 comprises a low band antenna 12, composed of one or more first radiating elements 14 and a high band network antenna 16 composed of second radiating elements 18.
- the high band antenna is a network antenna composed of second radiating elements 18, also called blocks, arranged in a square mesh dxd above a reflector plane 22.
- the low band antenna 12 is positioned above the high band network antenna 16, i.e. the opposite of the high band antenna 16 with respect to the reflector plane 22 so that the The high band antenna 16 constitutes a reflective plane for the low band antenna 12.
- the high band network antenna 16 which is used as the "ground plane" for the first low band radiating elements 14.
- the low band antenna 12 is able to operate in a first frequency band and the high band antenna 16 is able to operate in a second frequency band.
- the second frequency band is centered around a frequency F H called high frequency and the first frequency band is centered around a frequency F B said low frequency, the high frequency being strictly greater than the low frequency, and preferably greater than or equal to twice the low frequency.
- the low band antenna 12 is removable without inducing any disturbance on the operation of the high band antenna 16.
- an antenna system 10 according to the invention can operate both in frequency band on the one hand, and in frequency mono-band on the other hand, corresponding to the high frequency band of operation of the high band antenna.
- the radiating element 14 is perforated, having openings or perforations 24 whose shape is dependent on the shape and size of the second radiating elements 18, and the surface of the network antenna 16.
- the openings 24 are positioned opposite the second radiating elements 18.
- the dimensions of the first radiating element 14 are adjusted so as to obtain a resonance and thus an electromagnetic radiation in the target low frequency band.
- the positioning height H of the low band antenna 12 with respect to the high band antenna 16 is predetermined and less than or equal to a height L.
- the height L corresponds to the maximum distance over which each second radiating element 18 radiates in tubular mode, the transmitted wave being a plane wave, before radiating in a spherical wave, as illustrated in FIG. 2.
- the height L is of the order of 30 mm, and preferably the height H is chosen to be about 7 mm, in order to reduce the maximum the reactions of the high band antenna antenna in the presence of the low band antenna.
- the dual band antenna system is compact.
- FIG. 3 is an exploded view of a low band antenna 12 according to one embodiment of the invention, in which the first radiating element 14 and a support 30, of height H, are shown separately, making it possible to position the first radiating element with respect to the high band antenna 16 of FIG.
- the support 30 is able, by its composition and shape, to reduce any disturbance of the radiation of the second radiating elements in the presence of the low band antenna.
- the support 30 is formed in a material capable of propagating the electromagnetic radiation of each second radiating element without disturbance.
- the support is made of foam 32 having cavities 34, the cells being placed facing the second radiating elements and the perforations 24 of the first radiating element, so as to let the electromagnetic radiation of the second radiating elements of the antenna high band.
- another material for example a dielectric material, may be used to make the support 30.
- a metallized excitation device or probe 38 On the upper face 36 of the support 30, on which the first radiating element 14 is placed, is also positioned a metallized excitation device or probe 38, intended to ensure the excitation of the first radiating element.
- the metallized excitation device 38 is a metallized hole passing through the support 30.
- the low band RF electromagnetic signal can be supplied by a supply circuit, formed from a micro-ribbon printed line or from a co-axial cable positioned on the underside of the support 30, which is the face opposite to the face 36, and which will be made to be positioned directly on between the second radiating elements 18 of the high band antenna.
- the dual frequency band antenna system 10 operates when the low band antenna 12 is positioned on the high band antenna 16 without any modification to the high band antenna 16.
- the high band antenna 16 is composed of second radiating elements designed to operate in a metal cavity, thus making it possible to take advantage of the metal wall separating the blocks 18 to produce the supply circuit providing the signal electromagnetic RF low band.
- FIG. 4 illustrates a first embodiment of a first radiating element 14 according to the invention, in a view from above.
- the first radiating element 14 is positioned, in the view of FIG. 4, above the second radiating elements 18 of the high band antenna.
- the first radiating element 14 is made by a printed circuit on a dielectric sheet 40.
- the perforated form of the first element 14 is determined according to the shape of the high band network antenna 16, the size pavers 18 and the target low frequency. The determination of the appropriate shape according to these constraints using an electromagnetic simulation software is within the abilities of those skilled in the art.
- the positioning of the metallized excitation device 38 is also calculated as a function of the low target frequency and the target impedance in adaptation, and therefore of the standing wave ratio (TOS).
- TOS standing wave ratio
- the first radiating element 14 and made from a metal mesh, which is able to be positioned on the upper face 36 of a support 30.
- the first radiating element is a single element of the padded antenna type.
- the invention also applies analogously with a low band antenna composed of a network of first radiating elements.
- the low band antenna described is thin because it is carried out either by printed circuit or by mechanical roasting, which makes it possible to obtain a two-band antenna system of small size.
- the low band antenna may or may not be positioned above an existing network antenna type high band antenna without disturbing the operation of the high band antenna in its frequency band which remains unchanged and without requiring modification to this one.
- the antennal bi-band system according to the invention is easily achievable at low cost. Thanks to the provided support, the introduction and / or removal of the low band antenna of the two-band antennal system is easy, which makes it easy to produce a modular antenna system.
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- Electromagnetism (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
Abstract
The invention relates to a low-band antenna (12) capable of operating in a first frequency band centered on a first so-called low frequency, comprising at least one first radiating element (14), capable of being positioned on a high-band array antenna (16) which operates in a second frequency band centered on a second so-called high frequency, said high frequency being strictly greater than said low frequency, so as to form a dual frequency-band antenna system (10), said high-band array antenna (16) comprising an array of second radiating elements (18), each outputting electromagnetic radiation. Each first radiating element (14) comprises cutouts (24), the shape of which depends on the shape of the second radiating elements (18), the shape of the cutouts being determined so as to propagate the electromagnetic radiation of each second radiating element without interference, thereby enabling the high-band array antenna (16) to operate without interference in said second frequency band in the presence or absence of the low-band antenna. The invention further relates to an associated dual frequency-band antenna system.
Description
Antenne bande basse apte à être positionnée sur une antenne réseau bande haute de manière à former un système antennaire bi-bande de fréquence Antenna band low able to be positioned on a high band antenna network so as to form a antennal system dual band frequency
La présente invention concerne une antenne bande basse apte à fonctionner dans une première bande de fréquence centrée sur une première fréquence dite fréquence basse, et apte à être positionnée sur une antenne réseau bande haute de manière à former un système antennaire bi-bande, et ainsi qu'un système antennaire bi-bande de fréquence associé. The present invention relates to a low-band antenna capable of operating in a first frequency band centered on a first low-frequency frequency, and able to be positioned on a high band network antenna so as to form a two-band antennal system, and thus an antenna system dual-band frequency associated.
De manière générale, l'invention se situe dans le domaine des systèmes antennaires bi-bande de fréquence. In general, the invention lies in the field of antennal two-band frequency systems.
Dans diverses applications, par exemple dans le domaine de la télédétection et de l'observation de la terre, dans le domaine de la réception par satellite, on utilise des antennes couvrant diverses bandes de fréquence, allant des ondes UHF et VHF jusqu'aux ondes millimétriques. Il existe également des applications associant la nécessité d'utiliser deux bandes de fréquence distinctes. In various applications, for example in the field of remote sensing and earth observation, in the field of satellite reception, antennas covering various frequency bands are used, ranging from UHF and VHF waves to the waves. millimeter. There are also applications associating the need to use two distinct frequency bands.
A cet effet, il a été proposé, au lieu d'utiliser deux antennes séparées, ce qui est coûteux et présente un grand encombrement, de mettre en place des antennes bi-bandes de fréquence, c'est-à-dire aptes à fonctionner simultanément dans deux bandes de fréquence distinctes. For this purpose, it has been proposed, instead of using two separate antennas, which is expensive and has a large footprint, to set up two-band frequency antennas, that is to say capable of operating simultaneously in two separate frequency bands.
Lorsqu'on cherche à couvrir deux bandes de fréquence, on distingue naturellement une bande haute centrée sur une fréquence plus haute et une bande basse centrée sur une fréquence plus basse. When seeking to cover two frequency bands, there is of course a high band centered on a higher frequency and a lower band centered on a lower frequency.
Une solution connue consiste à associer une antenne bande haute de type antenne réseau à fentes avec une antenne bande basse de type dipôles, utilisant le plan métallique de l'antenne bande haute comme plan réflecteur. Cependant, les antennes de type dipôle présentent un fort encombrement. Typiquement, un dipôle de longueur totale proche d'une demie longueur d'onde (λ/2) par exemple égale à 150 mm à 1 GHZ, fonctionne correctement avec des brins positionnés à λ/4, soit 75 mm dans cet exemple au dessus du plan réflecteur. A known solution consists in associating a high band antenna type band antenna antenna with a dipole-type low band antenna, using the metal plane of the high band antenna as a reflective plane. However, the dipole type antennas have a large footprint. Typically, a dipole of total length close to half a wavelength (λ / 2) for example equal to 150 mm at 1 GHZ, works correctly with strands positioned at λ / 4, ie 75 mm in this example above reflective plane.
On connaît par ailleurs du document L. Shafai et al, « Dual-band dual-polarized microstrip antennas for SAR applications », IEEE, 1997, un système antennaire bi-bande de fréquence constitué d'une antenne réseau de pavés ou éléments rayonnants imprimés au-dessus de laquelle est fixée une antenne bande basse constituée de pavés ou éléments rayonnants. Ce système antennaire bi-bande de fréquence présente un encombrement plus faible qu'un système comportant une antenne bande basse de type dipôles. Cependant, ce système antennaire présente l'inconvénient d'être conçu de manière figée pour un fonctionnement en bi-bande de fréquence.
Or il est utile, pour certaines applications, de permettre à la fois le fonctionnement bi-bande de fréquence et le fonctionnement mono-bande, tout en conservant le faible encombrement du système antennaire, et avec une faible complexité pour passer du mode de fonctionnement bi-bande au mode de fonctionnement mono-bande et vice- versa. Also known from L. Shafai et al, "Dual-band dual-polarized microstrip antennas for SAR applications", IEEE, 1997, a two-band antennal frequency system consists of a network antenna pavers or radiating elements printed above which is fixed a low band antenna consisting of cobblestones or radiating elements. This antenna system dual-band frequency has a smaller footprint than a system comprising a low band antenna type dipoles. However, this antennal system has the disadvantage of being designed in a fixed manner for operation in dual frequency band. However, it is useful, for certain applications, to allow both the dual frequency band operation and the single band operation, while maintaining the small size of the antenna system, and with a low complexity to switch from the dual operating mode. -band to single-band operation mode and vice versa.
A cet effet, l'invention propose une antenne bande basse apte à fonctionner dans une première bande de fréquence centrée sur une première fréquence dite fréquence basse, comportant au moins un premier élément rayonnant, apte à être positionnée sur une antenne réseau bande haute fonctionnant dans une deuxième bande de fréquence centrée sur une deuxième fréquence dite fréquence haute, ladite fréquence haute étant strictement supérieure à ladite fréquence basse, de manière à former un système antennaire bi-bande de fréquence, ladite antenne bande haute comportant un réseau de deuxièmes éléments rayonnants fournissant chacun un rayonnement électromagnétique. For this purpose, the invention proposes a low band antenna capable of operating in a first frequency band centered on a first low frequency frequency, comprising at least a first radiating element, able to be positioned on a high band network antenna operating in a a second frequency band centered on a second frequency called high frequency, said high frequency being strictly greater than said low frequency, so as to form a two-band frequency antennal system, said high band antenna comprising a network of second radiating elements providing each electromagnetic radiation.
L'antenne bande basse est remarquable en ce qu'elle est apte à utiliser l'antenne réseau bande haute comme plan réflecteur dans le système antennaire bi-bande de fréquence et en ce que chaque premier élément rayonnant comporte des ajourages dont la forme est dépendante de la forme des deuxièmes éléments rayonnants, la forme des ajourages étant déterminée de manière à propager le rayonnement électromagnétique de chaque deuxième élément rayonnant sans perturbation, permettant à l'antenne réseau bande haute de fonctionner sans perturbation dans ladite deuxième bande de fréquence en présence ou en absence de l'antenne bande basse. The low band antenna is remarkable in that it is able to use the high band antenna as a reflective plane in the antennary two-band frequency system and in that each first radiating element comprises perforations whose shape is dependent. of the shape of the second radiating elements, the shape of the perforations being determined so as to propagate the electromagnetic radiation of each second radiating element without disturbance, allowing the high band antenna to operate without disturbance in said second frequency band in the presence or in the absence of the low band antenna.
Avantageusement, l'antenne bande basse selon l'invention est conçue de manière à ne pas perturber le fonctionnement de l'antenne réseau bande haute, qu'elle soit positionnée ou non dans le système antennaire bi-bande de fréquence. Le système antennaire ainsi obtenu avec une antenne réseau haute fréquence classique et une antenne basse fréquence selon l'invention est modulaire, il peut à la fois fonctionner en bi- bande de fréquence lorsque les deux antennes sont en place, ou à la fréquence haute uniquement lorsque l'antenne bande basse est retirée. La mise en place du système antennaire bi-bande de fréquence est à la fois simple et peu coûteuse, dans la mesure où l'antenne réseau bande haute utilisée est une antenne classique, qui ne subit aucune modification pour fonctionner avec une antenne bande basse. Advantageously, the low band antenna according to the invention is designed in such a way as not to disturb the operation of the high band network antenna, whether or not it is positioned in the antennal two-band frequency system. The antennal system thus obtained with a conventional high-frequency network antenna and a low-frequency antenna according to the invention is modular, it can both operate in frequency bi-band when the two antennas are in place, or at the high frequency only. when the low band antenna is removed. The implementation of the antennary dual-band frequency system is both simple and inexpensive, since the high-band antenna antenna used is a conventional antenna, which undergoes no modification to operate with a low-band antenna.
L'antenne bande basse selon l'invention peut présenter une ou plusieurs des caractéristiques ci-dessous, prises indépendamment ou en combinaison : The low band antenna according to the invention may have one or more of the following characteristics, taken independently or in combination:
- ladite fréquence haute est supérieure ou égale au double de ladite fréquence basse ;
- la forme et la surface d'un dit premier élément rayonnant est déterminée en fonction de la taille des deuxièmes éléments rayonnants et de ladite fréquence basse ; said high frequency is greater than or equal to twice said low frequency; the shape and the surface of a said first radiating element is determined as a function of the size of the second radiating elements and of the said low frequency;
- elle comporte un support du ou des premiers éléments rayonnants en matériau apte à propager le rayonnement électromagnétique de chaque deuxième élément rayonnant sans perturbation, ledit support ayant une épaisseur prédéterminée, inférieure ou égale à une valeur maximale égale à la distance maximale sur laquelle chaque deuxième élément rayonnant rayonne en mode tubulaire ; it comprises a support for the first radiating element or elements in material capable of propagating the electromagnetic radiation of each second radiating element without disturbance, said support having a predetermined thickness, less than or equal to a maximum value equal to the maximum distance over which each second radiating element radiates in tubular mode;
- ledit support est constitué de mousse avec alvéoles, les alvéoles étant placées en regard des deuxièmes éléments rayonnants lorsque l'antenne bande basse est positionnée sur l'antenne réseau bande haute pour former un système antennaire bi- bande de fréquence; said support consists of foam with cavities, the cells being placed opposite the second radiating elements when the low band antenna is positioned on the high band antenna to form a two-band antenna system of frequency;
- elle comporte un circuit d'alimentation, positionné sur une face dudit support, située à l'opposé de la face dudit support sur laquelle sont positionnés lesdits premiers éléments rayonnants, ledit circuit d'alimentation étant positionné de manière à être implanté, lorsque l'antenne bande basse est positionnée sur l'antenne réseau bande haute pour former un système antennaire bi-bande de fréquence, entre lesdits deuxièmes éléments rayonnants ; it comprises a supply circuit, positioned on one side of said support, situated opposite the face of said support on which said first radiating elements are positioned, said supply circuit being positioned so as to be implanted, when the the low band antenna is positioned on the high band network antenna to form a two-band antenna system of frequency, between said second radiating elements;
- elle comporte un dispositif d'excitation métallisé traversant ledit support ; it comprises a metallized excitation device passing through said support;
- ledit au moins un premier élément rayonnant est réalisé comme circuit imprimé sur une feuille diélectrique ; said at least one first radiating element is formed as a printed circuit on a dielectric sheet;
- ledit au moins un premier élément rayonnant est composé d'un grillage métallique. said at least one first radiating element is composed of a metal mesh.
Selon un autre aspect, l'invention concerne un système antennaire bi-bande de fréquence, comportant une antenne bande basse apte à fonctionner dans une première bande de fréquence centrée sur une première fréquence dite fréquence basse, comportant au moins un premier élément rayonnant, telle que brièvement décrite ci- dessus, et une antenne réseau bande haute fonctionnant dans une deuxième bande de fréquence centrée sur une deuxième fréquence dite fréquence haute, ladite fréquence haute étant strictement supérieure à ladite fréquence basse. Le système antennaire bi- bande est remarquable en ce que ladite antenne bande basse est amovible, l'enlèvement de ladite antenne bande basse ne perturbant pas le fonctionnement de l'antenne réseau bande haute dans ladite deuxième bande de fréquence. According to another aspect, the invention relates to a two-band frequency antenna system, comprising a low band antenna capable of operating in a first frequency band centered on a first low frequency frequency, comprising at least a first radiating element, such as only briefly described above, and a high band network antenna operating in a second frequency band centered on a second frequency called high frequency, said high frequency being strictly greater than said low frequency. The two-band antennal system is notable in that said low band antenna is removable, the removal of said low band antenna not interfering with the operation of the high band antenna in said second frequency band.
Selon un mode de réalisation, la fréquence haute est supérieure ou égale au double de ladite fréquence basse.
D'autres caractéristiques et avantages de l'invention ressortiront de la description qui en est donnée ci-dessous, à titre indicatif et nullement limitatif, en référence aux figures annexées, parmi lesquelles : According to one embodiment, the high frequency is greater than or equal to twice said low frequency. Other features and advantages of the invention will emerge from the description given below, by way of indication and in no way limiting, with reference to the appended figures, among which:
-la figure 1 est une vue schématique d'un système antennaire bi-bande selon un mode de réalisation l'invention; FIG 1 is a schematic view of a two-band antennal system according to one embodiment of the invention;
-la figure 2 représente schématiquement la forme d'un rayonnement électromagnétique ; FIG. 2 diagrammatically represents the shape of an electromagnetic radiation;
-la figure 3 est une vue éclatée en perspective d'une antenne bande base selon un mode de réalisation de l'invention ; FIG. 3 is an exploded perspective view of a baseband antenna according to one embodiment of the invention;
-la figure 4 est une vue de dessus d'un premier élément rayonnant selon un premier mode de réalisation de l'invention, et FIG. 4 is a view from above of a first radiating element according to a first embodiment of the invention, and
-la figure 5 est une vue en perspective d'un premier élément rayonnant selon un deuxième mode de réalisation de l'invention. FIG 5 is a perspective view of a first radiating element according to a second embodiment of the invention.
Comme illustré à la figure 1 , selon un mode de réalisation, un système antennaire bi-bande de fréquence 10 selon l'invention comporte une antenne bande basse 12, composée d'un ou plusieurs premiers éléments rayonnants 14 et une antenne réseau bande haute 16, composée de deuxièmes éléments rayonnants 18. As illustrated in FIG. 1, according to one embodiment, a dual frequency band antenna system 10 according to the invention comprises a low band antenna 12, composed of one or more first radiating elements 14 and a high band network antenna 16 composed of second radiating elements 18.
Dans l'exemple de la figure 1 , l'antenne bande haute est une antenne réseau composée de deuxièmes éléments rayonnants 18, également appelés pavés, agencés en maillage carré dxd au dessus d'un plan réflecteur 22. In the example of FIG. 1, the high band antenna is a network antenna composed of second radiating elements 18, also called blocks, arranged in a square mesh dxd above a reflector plane 22.
L'antenne bande basse 12 est positionnée au-dessus de l'antenne réseau bande haute 16, c'est-à-dire à l'opposé de l'antenne bande haute 16 par rapport au plan réflecteur 22 de manière à ce que l'antenne bande haute 16 constitue un plan réflecteur pour l'antenne bande basse 12. Ainsi, c'est l'antenne réseau bande haute 16 qui est utilisée comme « plan de masse » pour les premiers éléments rayonnants bande basse 14. The low band antenna 12 is positioned above the high band network antenna 16, i.e. the opposite of the high band antenna 16 with respect to the reflector plane 22 so that the The high band antenna 16 constitutes a reflective plane for the low band antenna 12. Thus, it is the high band network antenna 16 which is used as the "ground plane" for the first low band radiating elements 14.
L'antenne bande basse 12 est apte à fonctionner dans une première bande de fréquence et l'antenne bande haute 16 est apte à fonctionner dans une deuxième bande de fréquence. Typiquement, la deuxième bande de fréquence est centrée autour d'une fréquence FH dite fréquence haute et la première bande de fréquence est centrée autour d'une fréquence FB dite fréquence basse, la fréquence haute étant strictement supérieure à la fréquence basse, et de préférence supérieure ou égale au double de la fréquence basse. The low band antenna 12 is able to operate in a first frequency band and the high band antenna 16 is able to operate in a second frequency band. Typically, the second frequency band is centered around a frequency F H called high frequency and the first frequency band is centered around a frequency F B said low frequency, the high frequency being strictly greater than the low frequency, and preferably greater than or equal to twice the low frequency.
Avantageusement selon l'invention l'antenne bande basse 12 est amovible sans induire de perturbation sur le fonctionnement de l'antenne bande haute 16.
Ainsi, un système antennaire 10 selon l'invention peut à la fois fonctionner en bi- bande de fréquence d'une part, et en mono-bande de fréquence d'autre part, correspondant à la bande de fréquence haute de fonctionnement de l'antenne bande haute. Advantageously according to the invention the low band antenna 12 is removable without inducing any disturbance on the operation of the high band antenna 16. Thus, an antenna system 10 according to the invention can operate both in frequency band on the one hand, and in frequency mono-band on the other hand, corresponding to the high frequency band of operation of the high band antenna.
Pour réaliser cette fonctionnalité consistant à ne pas perturber le fonctionnement de l'antenne réseau bande haute 16, l'élément rayonnant 14 est ajouré, comportant des ouvertures ou ajourages 24 dont la forme est dépendante de la forme et de la taille des deuxièmes éléments rayonnants 18, et de la surface de l'antenne réseau 16. Lorsque l'antenne bande basse 12 est positionnée dans le système antennaire bi-bande 10, les ouvertures 24 sont positionnées en regard des deuxièmes éléments rayonnants 18. To achieve this functionality of not disturbing the operation of the high band network antenna 16, the radiating element 14 is perforated, having openings or perforations 24 whose shape is dependent on the shape and size of the second radiating elements 18, and the surface of the network antenna 16. When the low band antenna 12 is positioned in the two-band antenna system 10, the openings 24 are positioned opposite the second radiating elements 18.
Les dimensions du premier élément rayonnant 14 sont ajustées de façon à obtenir une résonance et donc un rayonnement électromagnétique dans la bande basse fréquence visée. The dimensions of the first radiating element 14 are adjusted so as to obtain a resonance and thus an electromagnetic radiation in the target low frequency band.
La hauteur de positionnement H de l'antenne bande basse 12 par rapport à l'antenne bande haute 16 est prédéterminée et inférieure ou égale à une hauteur L. The positioning height H of the low band antenna 12 with respect to the high band antenna 16 is predetermined and less than or equal to a height L.
La hauteur L correspond à la distance maximale sur laquelle chaque deuxième élément rayonnant 18 rayonne en mode tubulaire, l'onde émise étant une onde plane, avant de rayonner en onde sphérique, comme illustré à la figure 2. Par exemple, pour une fréquence basse de l'ordre de 1 GHz et une fréquence haute de l'ordre de 10GHz, la hauteur L est de l'ordre de 30 mm, et de préférence la hauteur H est choisie de l'ordre de 7 mm, afin de réduire au maximum les réactions de l'antenne réseau bande haute en présence de l'antenne bande basse. Avantageusement, le système antennaire bi-bande réalisé est compact. The height L corresponds to the maximum distance over which each second radiating element 18 radiates in tubular mode, the transmitted wave being a plane wave, before radiating in a spherical wave, as illustrated in FIG. 2. For example, for a low frequency of the order of 1 GHz and a high frequency of the order of 10GHz, the height L is of the order of 30 mm, and preferably the height H is chosen to be about 7 mm, in order to reduce the maximum the reactions of the high band antenna antenna in the presence of the low band antenna. Advantageously, the dual band antenna system is compact.
La figure 3 est une vue éclatée d'une antenne bande basse 12 selon un mode de réalisation de l'invention, dans laquelle sont représentés séparément le premier élément rayonnant 14 et un support 30, de hauteur H, permettant de positionner le premier élément rayonnant par rapport à l'antenne bande haute 16 de la figure 1 . FIG. 3 is an exploded view of a low band antenna 12 according to one embodiment of the invention, in which the first radiating element 14 and a support 30, of height H, are shown separately, making it possible to position the first radiating element with respect to the high band antenna 16 of FIG.
Le support 30 est apte, de par sa composition et sa forme, à réduire toute perturbation du rayonnement des deuxièmes éléments rayonnants en présence de l'antenne bande basse. En particulier, le support 30 est formé dans un matériau apte à propager le rayonnement électromagnétique de chaque deuxième élément rayonnant sans perturbation. The support 30 is able, by its composition and shape, to reduce any disturbance of the radiation of the second radiating elements in the presence of the low band antenna. In particular, the support 30 is formed in a material capable of propagating the electromagnetic radiation of each second radiating element without disturbance.
De préférence, le support est constitué en mousse 32 comportant des alvéoles 34, les alvéoles étant placés en regard des deuxièmes éléments rayonnants et des ajourages 24 du premier élément rayonnant, de manière à laisser passer le rayonnement électromagnétique des deuxièmes éléments rayonnants de l'antenne bande haute.
En variante, un autre matériau, par exemple un matériau diélectrique, peut être utilisé pour réaliser le support 30. Preferably, the support is made of foam 32 having cavities 34, the cells being placed facing the second radiating elements and the perforations 24 of the first radiating element, so as to let the electromagnetic radiation of the second radiating elements of the antenna high band. Alternatively, another material, for example a dielectric material, may be used to make the support 30.
Sur la face supérieure 36 du support 30, sur laquelle on pose le premier élément rayonnant 14, est également positionné un dispositif d'excitation métallisé ou sonde 38, destiné à assurer l'excitation du premier élément rayonnant. On the upper face 36 of the support 30, on which the first radiating element 14 is placed, is also positioned a metallized excitation device or probe 38, intended to ensure the excitation of the first radiating element.
Selon un mode de réalisation, le dispositif d'excitation métallisé 38 est un trou métallisé traversant le support 30. Le signal électromagnétique RF bande basse peut être amené par un circuit d'alimentation, formé à partir d'une ligne imprimée micro-ruban ou à partir d'un câble co-axial positionné sur la face inférieure du support 30, qui est la face opposée à la face 36, et qui sera amené à être positionné directement sur entre les deuxièmes éléments rayonnants 18 de l'antenne bande haute. According to one embodiment, the metallized excitation device 38 is a metallized hole passing through the support 30. The low band RF electromagnetic signal can be supplied by a supply circuit, formed from a micro-ribbon printed line or from a co-axial cable positioned on the underside of the support 30, which is the face opposite to the face 36, and which will be made to be positioned directly on between the second radiating elements 18 of the high band antenna.
Ainsi, le système antennaire bi-bande de fréquence 10 fonctionne lorsque l'antenne bande basse 12 est positionnée sur l'antenne bande haute 16 sans aucune modification apportée à l'antenne bande haute 16. Thus, the dual frequency band antenna system 10 operates when the low band antenna 12 is positioned on the high band antenna 16 without any modification to the high band antenna 16.
II est à noter que de préférence, l'antenne bande haute 16 est composée de deuxièmes éléments rayonnants conçus pour opérer en cavité métallique, permettant alors de mettre à profit la paroi métallique séparant les pavés 18 pour réaliser le circuit d'alimentation fournissant le signal électromagnétique RF bande basse. It should be noted that, preferably, the high band antenna 16 is composed of second radiating elements designed to operate in a metal cavity, thus making it possible to take advantage of the metal wall separating the blocks 18 to produce the supply circuit providing the signal electromagnetic RF low band.
La figure 4 illustre un premier mode de réalisation d'un premier élément rayonnant 14 selon l'invention, dans une vue de dessus. FIG. 4 illustrates a first embodiment of a first radiating element 14 according to the invention, in a view from above.
Le premier élément rayonnant 14 est positionné, dans la vue de la figure 4, au dessus des deuxièmes éléments rayonnant 18 de l'antenne bande haute. The first radiating element 14 is positioned, in the view of FIG. 4, above the second radiating elements 18 of the high band antenna.
Dans le premier mode de réalisation, le premier élément rayonnant 14 est réalisé par un circuit imprimé sur une feuille diélectrique 40. La forme ajourée du premier élément 14 est déterminée en fonction de la forme de l'antenne réseau bande haute 16, de la taille des pavés 18 et de la fréquence basse visée. La détermination de la forme adéquate en fonction de ces contraintes à l'aide d'un logiciel de simulation électromagnétique est à la portée de l'homme du métier. In the first embodiment, the first radiating element 14 is made by a printed circuit on a dielectric sheet 40. The perforated form of the first element 14 is determined according to the shape of the high band network antenna 16, the size pavers 18 and the target low frequency. The determination of the appropriate shape according to these constraints using an electromagnetic simulation software is within the abilities of those skilled in the art.
Le positionnement du dispositif d'excitation métallisé 38 est également calculé en fonction de la basse fréquence cible et de l'impédance visée en adaptation, donc du taux d'ondes stationnaires (TOS). The positioning of the metallized excitation device 38 is also calculated as a function of the low target frequency and the target impedance in adaptation, and therefore of the standing wave ratio (TOS).
Selon un deuxième mode de réalisation, illustré à la figure 5, le premier élément rayonnant 14 et réalisé à partir d'un grillage métallique, qui est apte à être positionné sur la face supérieure 36 d'un support 30.
Dans la description qui précède, le premier élément rayonnant est un seul élément de type antenne pavé. En variante, l'invention s'applique également de manière analogue avec une antenne bande basse composée d'un réseau de premiers éléments rayonnants. According to a second embodiment, illustrated in FIG. 5, the first radiating element 14 and made from a metal mesh, which is able to be positioned on the upper face 36 of a support 30. In the foregoing description, the first radiating element is a single element of the padded antenna type. Alternatively, the invention also applies analogously with a low band antenna composed of a network of first radiating elements.
Avantageusement, l'antenne bande basse décrite est de faible épaisseur car réalisée soit par circuit imprimé, soit par grillage mécanique, ce qui permet d'obtenir un système antennaire bi-bande de faible encombrement. L'antenne bande basse peut être positionnée ou non au-dessus d'une antenne bande haute de type antenne réseau existante, sans perturber aucunement le fonctionnement de l'antenne bande haute dans sa bande de fréquence qui reste inchangée et sans nécessiter de modification pour celle- ci. Ainsi, le système antennaire bi-bande selon l'invention est facilement réalisable, à faible coût. Grâce au support prévu, la mise en place et/ou le retrait de l'antenne bande basse du système antennaire bi-bande est aisé, ce qui permet de réaliser aisément un système antennaire modulaire.
Advantageously, the low band antenna described is thin because it is carried out either by printed circuit or by mechanical roasting, which makes it possible to obtain a two-band antenna system of small size. The low band antenna may or may not be positioned above an existing network antenna type high band antenna without disturbing the operation of the high band antenna in its frequency band which remains unchanged and without requiring modification to this one. Thus, the antennal bi-band system according to the invention is easily achievable at low cost. Thanks to the provided support, the introduction and / or removal of the low band antenna of the two-band antennal system is easy, which makes it easy to produce a modular antenna system.
Claims
1 . - Antenne bande basse (12) apte à fonctionner dans une première bande de fréquence centrée sur une première fréquence dite fréquence basse, comportant au moins un premier élément rayonnant (14), apte à être positionnée sur une antenne réseau bande haute (16) fonctionnant dans une deuxième bande de fréquence centrée sur une deuxième fréquence dite fréquence haute, ladite fréquence haute étant strictement supérieure à ladite fréquence basse, de manière à former un système antennaire bi- bande de fréquence (10), ladite antenne réseau bande haute (16) comportant un réseau de deuxièmes éléments rayonnants (18) fournissant chacun un rayonnement électromagnétique, 1. - Low band antenna (12) adapted to operate in a first frequency band centered on a first frequency called low frequency, having at least a first radiating element (14), capable of being positioned on a high bandwidth network antenna (16) operating in a second frequency band centered on a second so-called high frequency frequency, said high frequency being strictly greater than said low frequency, so as to form a two-band frequency antenna system (10), said high band network antenna (16) having an array of second radiating elements (18) each providing electromagnetic radiation,
caractérisée en ce qu'elle est apte à utiliser l'antenne réseau bande haute (16) comme plan réflecteur dans le système antennaire bi-bande de fréquence (10) et en ce que chaque premier élément rayonnant (14) comporte des ajourages (24) dont la forme est dépendante de la forme des deuxièmes éléments rayonnants (18), la forme des ajourages étant déterminée de manière à propager le rayonnement électromagnétique de chaque deuxième élément rayonnant sans perturbation, permettant à l'antenne réseau bande haute (16) de fonctionner sans perturbation dans ladite deuxième bande de fréquence en présence ou en absence de l'antenne bande basse. characterized in that it is adapted to use the high band antenna array (16) as a reflective plane in the two-band frequency antenna system (10) and in that each first radiating element (14) has cut-outs (24). ) whose shape is dependent on the shape of the second radiating elements (18), the shape of the perforations being determined so as to propagate the electromagnetic radiation of each second radiating element without disturbance, allowing the high band antenna (16) to operating without disturbance in said second frequency band in the presence or absence of the low band antenna.
2. - Antenne selon la revendication 1 , caractérisée en ce que ladite fréquence haute est supérieure ou égale au double de ladite fréquence basse. 2. - Antenna according to claim 1, characterized in that said high frequency is greater than or equal to twice said low frequency.
3. - Antenne selon l'une des revendications 1 ou 2, caractérisée en ce que la forme et la surface d'un dit premier élément rayonnant (14) est déterminée en fonction de la taille des deuxièmes éléments rayonnants (18) et de ladite fréquence basse. 3. - Antenna according to one of claims 1 or 2, characterized in that the shape and the surface of a said first radiating element (14) is determined according to the size of the second radiating elements (18) and said low frequency.
4. - Antenne selon l'une des revendications 1 à 3, caractérisée en ce qu'elle comporte un support (30) du ou des premiers éléments rayonnants (14) en matériau apte à propager le rayonnement électromagnétique de chaque deuxième élément rayonnant (18) sans perturbation, ledit support ayant une épaisseur (H) prédéterminée, inférieure ou égale à une valeur maximale égale à la distance maximale (L) sur laquelle chaque deuxième élément rayonnant (18) rayonne en mode tubulaire. 4. Antenna according to one of claims 1 to 3, characterized in that it comprises a support (30) of the first or radiating elements (14) of material capable of propagating the electromagnetic radiation of each second radiating element (18). ) without disturbance, said support having a thickness (H) predetermined, less than or equal to a maximum value equal to the maximum distance (L) on which each second radiating element (18) radiates in tubular mode.
5.- Antenne selon la revendication 4, caractérisé en ce que ledit support (30) est constitué de mousse avec alvéoles (34), les alvéoles (34) étant placées en regard des deuxièmes éléments rayonnants (18) lorsque l'antenne bande basse (12) est positionnée sur l'antenne réseau bande haute (16) pour former un système antennaire bi-bande de fréquence (10). 5. Antenna according to claim 4, characterized in that said support (30) is made of foam with cells (34), the cells (34) being placed opposite the second radiating elements (18) when the low band antenna (12) is positioned on the high band network antenna (16) to form a two-band frequency antenna system (10).
6.- Antenne selon l'une des revendications 4 ou 5, caractérisée en ce qu'elle comporte un circuit d'alimentation, positionné sur une face dudit support (30), située à l'opposé de la face (36) dudit support sur laquelle sont positionnés lesdits premiers éléments rayonnants (14), ledit circuit d'alimentation étant positionné de manière à être implanté, lorsque l'antenne bande basse (12) est positionnée sur l'antenne réseau bande haute (16) pour former un système antennaire bi-bande de fréquence (10), entre lesdits deuxièmes éléments rayonnants(18). 6. Antenna according to one of claims 4 or 5, characterized in that it comprises a supply circuit, positioned on a face of said support (30), located at the opposite of the face (36) of said support on which said first radiating elements (14) are positioned, said supply circuit being positioned so as to be implanted, when the low band antenna (12) is positioned on the high band network antenna (16) for forming a two-band frequency antenna system (10) between said second radiating elements (18).
7. - Antenne selon la revendication 6, caractérisée en ce qu'elle comporte un dispositif d'excitation métallisé (38) traversant ledit support. 7. - Antenna according to claim 6, characterized in that it comprises a metallized excitation device (38) passing through said support.
8. - Antenne selon l'une des revendications précédentes, caractérisée en ce que ledit au moins un premier élément rayonnant (14) est réalisé comme circuit imprimé sur une feuille diélectrique. 8. - Antenna according to one of the preceding claims, characterized in that said at least one first radiating element (14) is formed as a printed circuit on a dielectric sheet.
9. - Antenne selon l'une des revendications 1 à 7, caractérisée en ce que ledit au moins un premier élément rayonnant (14) est composé d'un grillage métallique. 9. - Antenna according to one of claims 1 to 7, characterized in that said at least one first radiating element (14) is composed of a metal mesh.
10. - Système antennaire bi-bande de fréquence (10), comportant une antenne bande basse (12) apte à fonctionner dans une première bande de fréquence centrée sur une première fréquence dite fréquence basse, comportant au moins un premier élément rayonnant (14), conforme à l'une des revendications 1 à 9 et une antenne réseau bande haute (16) fonctionnant dans une deuxième bande de fréquence centrée sur une deuxième fréquence dite fréquence haute, ladite fréquence haute étant strictement supérieure à ladite fréquence basse, caractérisé en ce que ladite antenne bande basse (12) est amovible, l'enlèvement de ladite antenne bande basse (12) ne perturbant pas le fonctionnement de l'antenne réseau bande haute (16) dans ladite deuxième bande de fréquence. 10. - Antenna system dual frequency band (10), comprising a low band antenna (12) adapted to operate in a first frequency band centered on a first frequency called low frequency, comprising at least a first radiating element (14) , according to one of claims 1 to 9 and a high band antenna (16) operating in a second frequency band centered on a second frequency called high frequency, said high frequency being strictly greater than said low frequency, characterized in that said low band antenna (12) is removable, the removal of said low band antenna (12) does not disturb the operation of the high band antenna (16) in said second frequency band.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP13704813.8A EP2817849A1 (en) | 2012-02-21 | 2013-02-20 | Low-band antenna capable of being positioned on a high-band array antenna so as to form a dual frequency-band antenna system |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1200505A FR2987175B1 (en) | 2012-02-21 | 2012-02-21 | LOW BAND ANTENNA POSSIBLE TO BE POSITIONED ON A HIGH BAND NETWORK ANTENNA TO FORM A BI-BAND FREQUENCY ANTENNA SYSTEM |
| FR12/00505 | 2012-02-21 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2013124323A1 true WO2013124323A1 (en) | 2013-08-29 |
Family
ID=47722306
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/EP2013/053387 WO2013124323A1 (en) | 2012-02-21 | 2013-02-20 | Low-band antenna capable of being positioned on a high-band array antenna so as to form a dual frequency-band antenna system |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP2817849A1 (en) |
| FR (1) | FR2987175B1 (en) |
| WO (1) | WO2013124323A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR3045166B1 (en) * | 2015-12-09 | 2018-02-16 | Thales | MODULAR ACTIVE BI-BAND ANTENNA |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5952971A (en) * | 1997-02-27 | 1999-09-14 | Ems Technologies Canada, Ltd. | Polarimetric dual band radiating element for synthetic aperture radar |
| US20090251356A1 (en) * | 2008-04-04 | 2009-10-08 | Toyota Motor Engineering & Manufacturing North America, Inc. | Dual-band antenna array and rf front-end for automotive radars |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB8501225D0 (en) * | 1985-01-17 | 1985-02-20 | Cossor Electronics Ltd | Antenna |
-
2012
- 2012-02-21 FR FR1200505A patent/FR2987175B1/en active Active
-
2013
- 2013-02-20 EP EP13704813.8A patent/EP2817849A1/en not_active Withdrawn
- 2013-02-20 WO PCT/EP2013/053387 patent/WO2013124323A1/en active Application Filing
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5952971A (en) * | 1997-02-27 | 1999-09-14 | Ems Technologies Canada, Ltd. | Polarimetric dual band radiating element for synthetic aperture radar |
| US20090251356A1 (en) * | 2008-04-04 | 2009-10-08 | Toyota Motor Engineering & Manufacturing North America, Inc. | Dual-band antenna array and rf front-end for automotive radars |
Non-Patent Citations (3)
| Title |
|---|
| JAMES J R ET AL: "SUPERIMPOSED DICHROIC MICROSTRIP ANTENNA ARRAYS", IEE PROCEEDINGS H. MICROWAVES, ANTENNAS & PROPAGATION, INSTITUTION OF ELECTRICAL ENGINEERS. STEVENAGE, GB, vol. 135, no. 5, PART H, 1 October 1988 (1988-10-01), pages 304 - 312, XP000008833, ISSN: 0950-107X * |
| L. SHAFAI ET AL.: "Dual-band dual-polarized microstrip antennas for SAR applications", IEEE, 1997 |
| SHAFAI L ET AL: "Dual-band dual-polarized microstrip antennas for SAR applications", ANTENNAS AND PROPAGATION SOCIETY INTERNATIONAL SYMPOSIUM, 1997. IEEE., 1997 DIGEST MONTREAL, QUE., CANADA 13-18 JULY 1997, NEW YORK, NY, USA,IEEE, US, vol. 3, 13 July 1997 (1997-07-13), pages 1866 - 1869, XP010247199, ISBN: 978-0-7803-4178-4, DOI: 10.1109/APS.1997.631634 * |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2987175A1 (en) | 2013-08-23 |
| EP2817849A1 (en) | 2014-12-31 |
| FR2987175B1 (en) | 2014-12-05 |
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