EP1583176B1 - Reflektorantenne mit einer 3D Wellenformerstruktur für mehrere Frequenzbereiche - Google Patents

Reflektorantenne mit einer 3D Wellenformerstruktur für mehrere Frequenzbereiche Download PDF

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Publication number
EP1583176B1
EP1583176B1 EP05290679A EP05290679A EP1583176B1 EP 1583176 B1 EP1583176 B1 EP 1583176B1 EP 05290679 A EP05290679 A EP 05290679A EP 05290679 A EP05290679 A EP 05290679A EP 1583176 B1 EP1583176 B1 EP 1583176B1
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EP
European Patent Office
Prior art keywords
reflector
antenna according
concentric
front face
band
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Expired - Lifetime
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EP05290679A
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English (en)
French (fr)
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EP1583176A1 (de
Inventor
Thierry Judasz
Jean-François David
Jacques Maurel
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Alcatel Lucent SAS
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Alcatel Lucent SAS
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q19/00—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic
    • H01Q19/10—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces
    • H01Q19/18—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces having two or more spaced reflecting surfaces
    • H01Q19/19—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces having two or more spaced reflecting surfaces comprising one main concave reflecting surface associated with an auxiliary reflecting surface
    • H01Q19/195—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces having two or more spaced reflecting surfaces comprising one main concave reflecting surface associated with an auxiliary reflecting surface wherein a reflecting surface acts also as a polarisation filter or a polarising device
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
    • H01Q15/0006—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices
    • H01Q15/0013—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices said selective devices working as frequency-selective reflecting surfaces, e.g. FSS, dichroic plates, surfaces being partly transmissive and reflective
    • H01Q15/0033—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices said selective devices working as frequency-selective reflecting surfaces, e.g. FSS, dichroic plates, surfaces being partly transmissive and reflective used for beam splitting or combining, e.g. acting as a quasi-optical multiplexer

Definitions

  • the invention relates to the field of microwave reflector (or RF) antennas, and more particularly to reflector antennas intended for the transmission and / or reception of electromagnetic waves belonging to at least two frequency bands (s).
  • frequency band (s) is meant here a band comprising at least one frequency.
  • a reflector antenna of the aforementioned type, comprises in particular a reflector responsible for reflecting the electromagnetic waves that it receives either from a local source when they are intended for a remote collector, or from a remote source when they are intended for a local collector. It is recalled that an antenna may include either one or more local sources, or one or more local collectors, or one or more local sources and one or more local collectors, possibly confused.
  • Some applications such as space applications, impose specific constraints on embedded antennas.
  • some telecommunications satellites are intended to transmit and receive several beams (or "brushes").
  • This simple solution is inefficient. Indeed, to operate according to 50 transmission beams and 50 reception beams, with one beam per antenna, it is necessary to use 100 antennas.
  • An intermediate solution is to achieve what the skilled person calls a "colorful mosaic of sources". This solution is to distribute, for example on three or four transmission antennas and three or four receiving antennas, sources to be initially adjacent, so as to free up space for each source. Each antenna is then dedicated to a single color or frequency. However, the number of antennas is still high (it is for example equal to 6 or 8).
  • the size of the reflector defines the size of the beam and its gain.
  • an antenna comprising a reflector whose front face is subdivided into a first "central” part, responsible for reflecting beams of waves at first and second frequencies, and a second "peripheral” part, surrounding the first and only selectively to reflect the lower frequency of the two, while diffracting or shifting the highest frequency as destructively as possible.
  • the radial extensions of the two parts are chosen so that the electrical dimension of the reflector (in terms of number of wavelengths) is substantially the same for the two frequencies, and therefore the widths of the two reflected beams are substantially equal.
  • R is the radius of the antenna and the whole antenna (reflector) at 20 GHz, ie R, is used. uses only 2R / 3 at 30 GHz to obtain beams of the same size at both frequencies.
  • each band has a rectangular cross section so as to introduce a destructive phase shift of 180 ° between the waves reflected on the top of the strips and those reflected in the interband space.
  • each strip has a cross section in the form of a sawtooth so as to diffract in all directions the waves having the greatest frequency.
  • the technique used for the electrical dimension of the reflector to be substantially the same for both frequencies, induces an enlargement of the main lobe of the antenna pattern for the greater of the frequencies, without specific and / or precise action on the side lobes, so that the level of the latter is high, while the quality of the main beam, associated with the main lobe, is low, and the aggregate insulation parameter (C / I) between beams of same frequency is low.
  • this technique causing the suppression or diffraction of a portion of the signal, substantially reduces the energy efficiency of the antenna.
  • the object of the invention is therefore to improve the situation.
  • a multifrequency reflector antenna comprising a reflector provided with a front face charged with reflecting beams of electromagnetic waves belonging to at least two different frequency bands (s).
  • This antenna is characterized in that the front face of its reflector preferably comprises, over its entire surface, a structure defining a three-dimensional (3D) pattern with symmetry of revolution (or rotation), chosen so as to shape the beams so that they have substantially identical radio frequency (RF) characteristics.
  • 3D three-dimensional
  • RF radio frequency
  • the beams are shaped to have substantially identical radio frequency characteristics.
  • the three-dimensional pattern may consist of concentric strips protruding or recessed having leading edges radius of gyration (or curvature) between about 1 mm and about 200 mm, and preferably between about 10 mm and about 40 mm.
  • each concentric band may extend over a chosen width, fixed or variable, and over a chosen height, fixed or variable, and the different concentric bands may be spaced from each other by a constant or variable pitch.
  • the antenna When the antenna is dedicated to transmission and reception, it comprises at least one source delivering a first beam of electromagnetic waves to be transmitted, belonging to a first frequency band (s), and at least one collector, possibly confused with the source, and responsible for collecting a second beam, belonging to a second frequency band (s).
  • the reflector is arranged to transmit the first beam from the source, after reflection and shaping by its front face, and to receive a beam of electromagnetic waves belonging to the second frequency band (s) , to transmit it to the collector in the form of the second beam after reflection and shaped by its front face.
  • the antenna When the antenna is dedicated to the only transmission, it comprises at least one source of beams to be transmitted.
  • the reflector is arranged to transmit the electromagnetic wave beams belonging to at least two different frequency bands (s) and from the source, after reflection and formatting by its front face.
  • the three-dimensional pattern is selected according to the transmission pattern of the source.
  • the antenna When the antenna is dedicated to the single reception, it comprises at least one beam collector.
  • the reflector is arranged to receive the electromagnetic wave beams belonging to at least two frequency bands (s), to transmit them to the collector after reflection and shaped by its front face.
  • the structure can either be attached to the front face or be an integral part of the front face.
  • the invention is particularly well suited, although not exclusively, to the field of space telecommunications, in particular in the Ka band (17.7 to 31 GHz).
  • the object of the invention is to allow the beam to be shaped by a reflector of a multifrequency antenna, possibly and preferably of the multibeam type.
  • the invention relates to all types of multifrequency reflector antenna, embedded or terrestrial, working in the microwave domain, in particular those above Gigahertz (GHz), and more particularly those belonging to the Ka band (17.7 GHz to 31 MHz). GHz).
  • GHz Gigahertz
  • the antennas are on board telecommunications satellites and operate in the Ka band.
  • the AR reflector antenna is, for example, exclusively dedicated to the transmission of electromagnetic waves in two frequency bands centered on the 20 GHz and 30 GHz values.
  • the first frequency band will be assimilated to its central value 20 GHz and the second frequency band to its central value 30 GHz.
  • the antenna could be dedicated either exclusively to the reception of electromagnetic wave beams belonging to at least two frequency bands, or both to the transmission of electromagnetic waves having at least one frequency and to receiving electromagnetic waves having at least one other frequency.
  • the invention relates to at least two-band frequency applications.
  • the AR multifrequency reflecting antenna shown has a source S supplying a reflector R in electromagnetic waves having the first (20 GHz) and second (30 GHz) frequencies. Any type of efficient source known to those skilled in the art can be used for this purpose.
  • the reflector R comprises a rigid shell, here secured to a deployment arm or to the structure of the spacecraft (here a satellite).
  • This rigid shell which will be discussed later, comprises a front face FA for reflecting the electromagnetic waves, delivered by the source S according to its transmission diagrams, in the form of first and second beams directed to the same terrestrial area.
  • the front face FA of the reflector R comprises an ST structure which defines a three-dimensional (3D) pattern with symmetry of revolution (or rotation). This 3D pattern is chosen to shape the two beams so that they have substantially identical radio frequency (RF) characteristics.
  • RF radio frequency
  • radiofrequency characteristics is understood to mean the electromagnetic characteristics, such as for example the beam width (or “beam width”), which characterizes the directionality of the antenna, and / or the electromagnetic radiation pattern, such as for example the distribution energy in a transverse plane (main lobe and side (or lateral) lobes), as well as eventually the weakening (or “roll off”).
  • beams of 20 and 30 GHz may have a width between about 0.5 ° and 1 ° (which corresponds to a high directivity antenna).
  • the diameter of the AR reflector antenna is between about 1500 mm and about 1600 mm, for example about 1560 mm.
  • the invention also applies to wider beams, or even much wider, but also thinner.
  • the 3D pattern is calculated using a computer, given the geometric characteristics desired for the two beams.
  • the calculation can also take into account the transmission diagrams of the S source for each of the first (here 20 GHz) and second (here 30 GHz) frequencies. This makes it possible, advantageously, to correct at least partially the imperfections of the transmission diagrams (but also those of reception when the antenna operates in reception or transmission / reception), as well as improvements not taken into account.
  • the calculation of the 3D pattern for shaping the two beams can be done in two steps: a first step of solving a two-dimensional (2D) antenna illumination problem, then a second step of generalizing the problem to a two-dimensional (2D) antenna illumination problem; 3D illumination.
  • an inverse Fourier transform is applied to it in order to obtain the corresponding current distribution.
  • the current distribution is close to a sinx / x function.
  • C T C S * C R , where C T is the total current distribution (i.e., the inverse transform of the desired far field ), C S is the contribution of the source S in amplitude and phase at the reflector R, and C R is the contribution of the reflector R to the amplitude and the phase of the total current (for example the induced phase change by a change of shape of the reflector).
  • C S C T / C S.
  • This function C R for example has the form of a truncated cosine having a maximum in the center of the reflector, then decreasing, then passing through zero, then becoming negative.
  • the 30 GHz wave meets a 3 ⁇ / 4 section, it is reflected and is out of phase by 3 ⁇ / 2 or 180 ° with respect to the neighboring section, so that it is in phase with the neighboring section.
  • the fineness or precision of the integral is proportional to the width of the sections.
  • a simple three-dimensional generalization (by first-order symmetry of revolution) then makes it possible to obtain the shape of the 3D pattern (and therefore of the reflector R) which makes it possible to obtain the desired total current distribution C T.
  • the main purpose of the 3D pattern is thus to modify the phase diagram of the reflector R, or in other words to introduce an offset pattern, with respect to a reference parabola, with symmetry of revolution (or rotation), relative to the standard form of said reflector R, for example parabolic.
  • the 3D pattern is preferably made in the form of concentric strips BC 3D protruding or recessed. It is important to note that these BC concentric bands can, in some situations, not be 360 ° continuous. They may indeed have areas in which they are interrupted. However, the shape of a concentric band BC, that is to say its cross section, is constant (apart from any interruption zones).
  • 3D patterns Three partial examples of 3D patterns are illustrated on the Figures 4 to 6 , in cross-sectional views. More specifically, the example illustrated on the figure 4 As an example, to facilitate the understanding of the invention, it corresponds to a symmetrical protruding 3D pattern, in which the concentric strips BC are all identical (width d1 constant and height h constant) and spaced apart by a constant pitch d2. Alternatively, the width d1 and the pitch d2 may be constant, and the height h may vary from one concentric band BC to another.
  • a concentric band BC may have a width d1
  • another band concentric BC may have a width d3
  • yet another concentric band BC may have a width d5.
  • the spacing between adjacent concentric bands is preferably variable (here, the spacing d2 is smaller than the spacing d4), and the height h varies preferentially from one concentric band BC to another.
  • the example shown on the figure 6 also corresponds to a hollow 3D pattern, in which all the concentric bands BC have different shapes and irregular spacings.
  • a concentric band BC may have a width d2
  • another concentric band BC may have a width d4
  • yet another concentric band BC may have a width d6.
  • the spacing between adjacent concentric bands varies (here d1 ⁇ d3 ⁇ d5 ⁇ d7), and the height h varies preferentially from one concentric band BC to another.
  • the height h is about 7.5 mm, and the widths and spacings di are between about 80 mm and 400 mm.
  • the concentric bands BC of the 3D pattern preferably comprise rounded BA leading edges having a radius of gyration (or curvature) of between about 1 mm and about 200 mm, and more preferably between about 10 mm and about 40 mm.
  • the material constituting the 3D pattern may be optionally metallized to minimize the radio losses.
  • a thermal control of the reflector R can be conventionally obtained by means of a radome placed on its front face FA and a thermal insulator, in SLI technology (for "Single Layer Insulation” or “Single Layer Insulation”) or in MLI technology (for "Multiple Layer Insulation”) multiple), for example a Kapton leaf or laminate, placed on its back side. Alternatively, one can only provide a thermal insulation on the back side.
  • FIG. 8 we have shown on the figure 8 in a cross-sectional view, an example of a portion of a 3D pattern in which the concentric strips BC have a cross-section of the type of that illustrated in FIG. figure 7 , i.e. with rounded BA leading edges.
  • the 3D pattern extends over the entire front face FA of the reflector R, as illustrated in the diagram of FIG. figure 9 , but it can also extend only on a part of the front face FA of the reflector R, and in this case there is little or no concentric band BC in the central zone, as illustrated in the diagram of the figure 10 .
  • These two diagrams represent, in a planar projection, the positions of the different concentric bands BC (which are here transformed into lines because of the projection) with respect to the center of the reflector R.
  • the abscissa axis is graduated from 1 to 201, and materializes 200 points between the center and the edge of the reflector R.
  • the ordinate axis materializes the height h (in mm) of the concentric strips BC, for example about 7.5 mm.
  • the structure ST defining the 3D pattern, can be either attached to the front face FA of the reflector R, or be an integral part thereof. So, in the example shown on the figure 11 (as well as in the examples of Figures 14 to 16 which will be discussed later), the structure ST consists of several groups of concentric bands BC reported on the front face FA of the shell of the reflector R. In this case, each group is made using a specific mold , then attached, for example by gluing, to the front face FA of the reflector shell R.
  • the structure ST is an integral part of the shell of the reflector R.
  • the mold allowing the development of the shell, therefore comprises the negative impression of the structure ST.
  • the 3D pattern is therefore manufactured at the same time as the shell, by cooking, for example at 180 ° C (the temperature of course depends on the type of resin used).
  • Such molds can be made using the so-called 5D machining technology.
  • the shell can be made with a spacer of constant thickness or not.
  • the ST structure is also an integral part of the reflector shell R.
  • the front face FA and the rear face AR comprise the 3D pattern.
  • This embodiment of the reflector shell R facilitates its development, especially in series by molding or by hot stamping (between a punch and a counter punch), or by any other technique. It is important to note that only the FA front panel is functional.
  • the reflector according to the invention can be installed in the same way as any traditional reflector. So, in the example shown on the figure 14 , in a cross-sectional view, the R-type reflector, in the so-called "thick shell” technology, in a sandwich concept, is mounted on a BD deployment arm connected to a platform of the satellite.
  • the R-type reflector of the so-called "thin shell stiffened" type of technology in a sandwich concept, is mounted on a rigid structure SR of the satellite, for example by means of L-shaped clips.
  • a rigid structure SR of the satellite for example by means of L-shaped clips.
  • the reflector, ultra-thin shell is mounted on a so-called monolithic SR rigid structure, consisting of a single element or an assembly of monolithic elements, for example by means of L-shaped clips, possibly glued.
  • a so-called monolithic SR rigid structure consisting of a single element or an assembly of monolithic elements, for example by means of L-shaped clips, possibly glued.
  • Such an arrangement also offers good mechanical strength and good dimensional stability.
  • the multifrequency reflector antenna according to the invention offers many advantages compared to antennas of the prior art.
  • the number of antennas can be divided by two (this number can, for example, be reduced to 3 or 4 when in the prior art it is equal to 6 or 8).
  • the invention is not limited to the embodiments of multifrequency reflector antenna described above, only by way of example, but it encompasses all the variants that may be considered by those skilled in the art within the context of the claims herein. -after.
  • the invention relates to any reflector antenna provided with a structure defining a three-dimensional pattern with symmetry of revolution and having rounded and "soft" leading edges.

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  • Aerials With Secondary Devices (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)

Claims (16)

  1. Mehrfrequenzreflektorantenne (AR), umfassend einen Reflektor (R), der mit einer Vorderseite (FA) versehen ist, die dazu geeignet ist, elektromagnetische Wellenbündel zu reflektieren, die mindestens zwei unterschiedlichen Bändern mindestens einer Frequenz angehören, wobei die Vorderseite (FA) eine Struktur (ST) umfasst, die ein dreidimensionales Motiv mit Umdrehungssymmetrie definiert, das derart gewählt wird, dass die Bündel derart geformt werden, dass sie im Wesentlichen identische Funkfrequenzmerkmale aufweisen, wobei das dreidimensionale Motiv von vorspringenden konzentrischen Bändern (BC) gebildet ist, wobei sich jedes konzentrische Band (BC) auf einer gewählten Breite und einer gewählten Höhe erstreckt, dadurch gekennzeichnet, dass die gewählte Breite von einem konzentrischen Band (BC) zu einem anderen konzentrischen Band (BC) variabel ist und/oder dass die konzentrischen Bänder (BC) voneinander um einen variablen Abstand beabstandet sind.
  2. Antenne nach Anspruch 1, dadurch gekennzeichnet, dass sich die Struktur (ST) im Wesentlichen über die gesamte Fläche der Vorderseite (FA) erstreckt.
  3. Antenne nach Anspruch 1, dadurch gekennzeichnet, dass das dreidimensionale Motiv von vorspringenden konzentrischen Bändern (BC) gebildet ist, die Angriffsränder (BA) mit einem Krümmungs- oder Kreisradius zwischen ungefähr 1 mm und ungefähr 200 mm umfassen.
  4. Antenne nach Anspruch 1, dadurch gekennzeichnet, dass das dreidimensionale Motiv von zurückspringenden konzentrischen Bändern (BC) gebildet ist, die Angriffsränder (BA) mit einem Krümmungs- oder Kreisradius zwischen ungefähr 1 mm und ungefähr 200 mm umfassen.
  5. Antenne nach Anspruch 3, dadurch gekennzeichnet, dass die Angriffsränder (BA) einen Krümmungs- oder Kreisradius zwischen ungefähr 10 mm und ungefähr 40 mm aufweisen.
  6. Antenne nach Anspruch 3, dadurch gekennzeichnet, dass die gewählte Breite von einem konzentrischen Band (BC) zu einem anderen konzentrischen Band (BC) konstant ist.
  7. Antenne nach Anspruch 3, dadurch gekennzeichnet, dass die gewählte Höhe von einem konzentrischen Band (BC) zu einem anderen konzentrischen Band (BC) variabel ist.
  8. Antenne nach Anspruch 3, dadurch gekennzeichnet, dass die gewählte Höhe von einem konzentrischen Band (BC) zu einem anderen konzentrischen Band (BC) konstant ist.
  9. Antenne nach Anspruch 3, dadurch gekennzeichnet, dass die konzentrischen Bänder (BC) voneinander um einen konstanten Abstand beabstandet sind.
  10. Antenne nach Anspruch 1, dadurch gekennzeichnet, dass sie mindestens eine Quelle (S), die mindestens ein erstes zu übertragendes Bündel von elektromagnetischen Wellen, die einem ersten Frequenzband angehören, liefern kann, und mindestens einen Kollektor umfasst, der mindestens ein zweites Bündel, das einem zweiten Frequenzband angehört, sammeln kann, und dass der Reflektor (R) derart angeordnet ist, dass er das erste Bündel, das von der Quelle (S) stammt, nach Reflexion und Formung über seine Vorderseite (FA) überträgt und ein Bündel von elektromagnetischen Wellen empfängt, die dem zweiten Frequenzband angehören, und es an den Kollektor in Form des zweiten Bündels nach Reflexion und Formung über seine Vorderseite (FA) überträgt.
  11. Antenne nach Anspruch 10, dadurch gekennzeichnet, dass die Quelle (S) und der Kollektor zusammenfallen.
  12. Antenne nach Anspruch 1, dadurch gekennzeichnet, dass sie mindestens eine Quelle (S) von zu übertragenden Bündeln umfasst, und dass der Reflektor (R) derart angeordnet ist, dass er die Bündel von elektromagnetischen Wellen, die mindestens zwei unterschiedlichen Frequenzbändern angehören und von der Quelle (S) stammen, nach Reflexion und Formung über seine Vorderseite (FA) überträgt.
  13. Antenne nach Anspruch 10, dadurch gekennzeichnet, dass das dreidimensionale Motiv in Abhängigkeit von einem Übertragungsdiagramm der Quelle (S) gewählt wird.
  14. Antenne nach Anspruch 1, dadurch gekennzeichnet, dass sie mindestens einen Kollektor von Bündeln umfasst, und dass der Reflektor (R) derart angeordnet ist, dass er die Bündel von elektromagnetischen Wellen, die mindestens zwei Frequenzbändern angehören, empfängt und sie an den Kollektor nach Reflexion und Formung über seine Vorderseite (FA) überträgt.
  15. Antenne nach Anspruch 1, dadurch gekennzeichnet, dass die Struktur (ST) auf die Vorderseite (FA) aufgesetzt ist.
  16. Antenne nach Anspruch 1, dadurch gekennzeichnet, dass die Struktur (ST) wesentlicher Bestandteil des Reflektors (R) ist.
EP05290679A 2004-04-02 2005-03-25 Reflektorantenne mit einer 3D Wellenformerstruktur für mehrere Frequenzbereiche Expired - Lifetime EP1583176B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0450662A FR2868611B1 (fr) 2004-04-02 2004-04-02 Antenne reflecteur a structure 3d de mise en forme de faisceaux d'ondes appartenant a des bandes de frequences differentes
FR0450662 2004-04-02

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EP1583176A1 EP1583176A1 (de) 2005-10-05
EP1583176B1 true EP1583176B1 (de) 2008-03-05

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US (1) US7280086B2 (de)
EP (1) EP1583176B1 (de)
AT (1) ATE388502T1 (de)
CA (1) CA2500990C (de)
DE (1) DE602005005098T2 (de)
ES (1) ES2302149T3 (de)
FR (1) FR2868611B1 (de)

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US8815360B2 (en) 2007-08-28 2014-08-26 Cryovac, Inc. Multilayer film having passive and active oxygen barrier layers
US9343815B2 (en) * 2013-06-28 2016-05-17 Associated Universities, Inc. Randomized surface reflector
WO2018109837A1 (ja) * 2016-12-13 2018-06-21 三菱電機株式会社 反射鏡アンテナ装置
US10723299B2 (en) * 2017-05-18 2020-07-28 Srg Global Inc. Vehicle body components comprising retroreflectors and their methods of manufacture
US20180337460A1 (en) * 2017-05-18 2018-11-22 Srg Global Inc. Vehicle body components comprising retroreflectors and their methods of manufacture
FR3086105B1 (fr) * 2018-09-13 2020-09-04 Thales Sa Panneau reseau reflecteur radiofrequence pour antenne de satellite et reseau refecteur radiofrequence pour antenne de satellite comprenant au moins un tel panneau

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JP3326935B2 (ja) * 1993-12-27 2002-09-24 株式会社日立製作所 携帯無線機用小型アンテナ
US6169524B1 (en) * 1999-01-15 2001-01-02 Trw Inc. Multi-pattern antenna having frequency selective or polarization sensitive zones
US7065379B1 (en) * 1999-07-02 2006-06-20 Samsung Electronics Co., Ltd. Portable radio terminal equipment having conductor for preventing radiation loss
US6285332B1 (en) * 1999-09-10 2001-09-04 Trw Inc. Frequency selective reflector
US6720933B2 (en) * 2002-08-22 2004-04-13 Raytheon Company Dual band satellite communications antenna feed

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US7280086B2 (en) 2007-10-09
FR2868611A1 (fr) 2005-10-07
ATE388502T1 (de) 2008-03-15
CA2500990C (fr) 2016-05-17
DE602005005098D1 (de) 2008-04-17
US20050219146A1 (en) 2005-10-06
ES2302149T3 (es) 2008-07-01
CA2500990A1 (fr) 2005-10-02
DE602005005098T2 (de) 2009-03-26
EP1583176A1 (de) 2005-10-05
FR2868611B1 (fr) 2006-07-21

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