EP3183775A1 - Unité d'antenne multibande pour satellite - Google Patents

Unité d'antenne multibande pour satellite

Info

Publication number
EP3183775A1
EP3183775A1 EP14830538.6A EP14830538A EP3183775A1 EP 3183775 A1 EP3183775 A1 EP 3183775A1 EP 14830538 A EP14830538 A EP 14830538A EP 3183775 A1 EP3183775 A1 EP 3183775A1
Authority
EP
European Patent Office
Prior art keywords
band
frequency
feed
antenna unit
plate
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.)
Withdrawn
Application number
EP14830538.6A
Other languages
German (de)
English (en)
Inventor
Thomas Lohrey
Klaus Breitsameter
Georg Emanuel August STRAUSS
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Eutelsat SA
Original Assignee
Eutelsat SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Eutelsat SA filed Critical Eutelsat SA
Publication of EP3183775A1 publication Critical patent/EP3183775A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • H01Q19/12—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 wherein the surfaces are concave
    • H01Q19/13—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 wherein the surfaces are concave the primary radiating source being a single radiating element, e.g. a dipole, a slot, a waveguide termination
    • H01Q19/132—Horn reflector antennas; Off-set feeding
    • 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
    • H01Q15/0026—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 said selective devices having a stacked geometry or having multiple layers
    • 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
    • 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
    • H01Q19/12—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 wherein the surfaces are concave
    • H01Q19/17—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 wherein the surfaces are concave the primary radiating source comprising two or more radiating elements
    • 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
    • H01Q19/192—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 with dual offset reflectors
    • 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
    • H01Q5/45—Imbricated or interleaved structures; Combined or electromagnetically coupled arrangements, e.g. comprising two or more non-connected fed radiating elements using two or more feeds in association with a common reflecting, diffracting or refracting device

Definitions

  • the invention relates to the field of satellite communications and antennas for satellite ground terminals and is more specifically directed to multi-band antenna dish.
  • Antennas with large antenna gain with simultaneously low ground noise are of great importance for exchanging information by means of electromagnetic signals in free space. This applies in particular, if the signals is to be received are weak or the distance between the transmitter and receiver is large, such as e.g. in the case of communication involving satellites.
  • LNB Low Noise Block
  • Satellite Internet access is currently available and has found favorable market acceptance.
  • the signals are exchanged between the terrestrial antenna and the satellite bidirectionally.
  • frequencies in the Ka band typically between 26.6 and 40 GHz (uplink)
  • K band typically between 18 and 26.5 GHz (downlink), which do not overlap with the frequencies mentioned for television (Ku band) may be for instance used.
  • a known solution to this problem is to provide a single dish antenna capable of handling the two way Internet connection as well as the reception of the Ku-band satellite.
  • Such a solution is disclosed in the document US6512485 which discloses a satellite multi-band antenna comprising:
  • FSS sub-reflector - a frequency selective reflective surface (FSS) sub-reflector; - a first feed connected to a first LNB, said first feed being located in a first location for receiving signals at Ku band reflected from the main reflector and transmitted through the FSS sub- reflector;
  • FSS frequency selective reflective surface
  • the FSS sub-reflector according to US6512485 consists of a sheet of dielectric material on which is arranged a spaced array of resonant elements.
  • the resonant elements are sized and configured to resonate at the frequencies to be reflected by the FSS.
  • a FSS built with resonant elements is typically used, if a low pass be- havior of the FSS is desired.
  • the transmission losses of a FSS built with resonant elements and used as a high pass would be much too high.
  • Document EP0059343 discloses a multi-band antenna comprising a frequency-selective reflecting surface (FSRS) of high-pass type.
  • the FSRS comprises two or three metallic square-apertured lattices arranged in parallel to one another. Interactions between the lattices create resonance points that broaden the band pass characteristic of the FSRS.
  • the FSRS of document EP0059343 may have unpredictable effects on the antenna characteristics and the link budget over the satellite. Especially, with such resonance structure, it may be difficult to maintain the antenna characteristics in line with the specifications of the satellite operator's requirements. This concerns mainly the antenna side-lobe patterns for transmitting antennas and the cross-polar discrimination.
  • This FSRS may be sufficiently good for receiving-only solutions from high power satellite that provide sufficient link margin to compensate the attenuation of the frequency selective surface, but not for receiving and transmitting solutions in antennas with a limited transmit power.
  • One object of the present invention is to provide a satellite multi-band antenna unit for providing two-way broadband Internet access and direct broadcast television, said antenna unit using a FSS unit of high-pass type that is easier to manufacture and that has improved characteristics, especially in terms of frequency selectivity.
  • the present invention provides a satellite multi-band antenna unit comprising:
  • a first feed connected to a first low noise down converter, said first feed being located in a first location for receiving radiation in a first frequency band, said radiation in the first frequency band comprising a plurality of incident beams reflected from said main reflector and transmitted through said frequency selective reflective unit;
  • a second feed connected to a second low noise down converter, said second feed being located in a second location for receiving radiation in a second frequency band lower than said first frequency band, said radiation in the second frequency band comprising a plurality of incident beams reflected from said main reflector and from said frequency selective unit;
  • said frequency selective reflective unit comprises at least two electrically conductive plates facing each other, each plate having an array of spaced apart apertures, and wherein the spaced apart apertures of each plate have inner dimensions increasing with an angle of the incident beams, said angle of the incident beams being measured with respect to a normal vector of the frequency selective reflective unit.
  • the invention is focused on an antenna unit comprising a frequency selective reflective unit having a high pass behavior.
  • each aperture of the electrically conductive plates can be understood as a waveguide, i.e. a hollow conducting tube with uniform cross section of arbitrary shape, and not as a resonance structure.
  • the satellite multi-band antenna according to the invention may also present one or more of the features below, considered individually or according to all technically possible combinations:
  • said first frequency band covers K-band and/or Ka-band; advantageously, said first frequency band is K-band;
  • said dielectric material has permittivity substantially equal to one
  • the unit according to the invention comprises more than two plates arranged in cascade, each successive plate facing each other;
  • the ratio between the thickness of said plate and the width of the aperture is equal or smaller than 1 :4 (The ratio of a working example is 1 :4).
  • FIG. 1 shows schematically a satellite multi-band antenna unit 1 according to the invention
  • FIG. 2 to 4 illustrate schematically the frequency-dependent behavior of transmission and reflection of the frequency selective reflective unit included in the antenna unit of figure 1 ;
  • FIG. 5 and 6 show respectively the plan view and the side view of a thin plate used in cascade in a first embodiment of the antenna unit according to the invention
  • FIG. 7 illustrates the electrical equivalent circuit of the thin plate of figures 5 and 6
  • FIG. 8 and 9 illustrate the frequency-dependent behavior of the reflection and the transmission factors (in dB) as a function of frequency for two different sizes of the apertures of the thin plate of figures 5 and 6 ;
  • FIG. 10 illustrates schematically the frequency selective reflective unit included in the antenna unit of the first embodiment
  • FIG. 13 and 14 illustrate the frequency-dependent behavior of the reflection and the transmission factors (in dB) as a function of frequency for the frequency selective reflective unit of figure 10;
  • FIG. 16 shows the plan view of a thin plate used in cascade in a second embodiment of the antenna unit according to the invention.
  • Figure 1 shows schematically a satellite multi-band antenna unit 1 according to the invention.
  • Said satellite multi-band antenna unit 1 comprises:
  • FSR frequency selective reflective
  • a first feed 4 mounted to a transceiver 5 in a housing including both a first low noise down converter (LNB) and a transmitter acting as an up-converter ;
  • LNB low noise down converter
  • the main reflector 2 is for instance a parabolic reflector dish which in front fed offset parabolic reflector with a prime focus 8 on the forward concave side 9 of the dish.
  • the rear convex side 10 of dish 2 is for instance bolted to a non-represented rear support bracket supporting on a nonrepresented mounting mast.
  • the FSR 3 is tilted of an angle a compared to the symmetry axis AA' of the parabolic shape of the main reflector 2.
  • a typical value of this angle a is 70°; said angle a is preferably less than or equal to 90°.
  • the first feed 4 makes it possible to handle Internet communication bi-directionally and is substantially placed at the prime focus 8 (i.e. in or in the vicinity of the focal point of the parabolic reflector).
  • the transceiver 5 includes:
  • a first LNB which receives from said first feed 4 downlink signals that may be in the K-band (18-26.5 GHz), amplifies the received signals with as little noise as possible and converts the same to lower frequencies for providing to an indoor data modem ;
  • an up-converter which receives signals from the data modem and converts the same to higher frequencies that may be for instance in the Ka-band (26.6-40 GHz) for providing uplink signals to said first feed 4.
  • the FSR unit 3 is positioned for, when acting as a reflector, defining an image focus 1 1 of the main reflector 2.
  • the structure of the FSR unit 3 according to the invention will be detailed later with respect to figures 10 and 16.
  • the second feed 6 makes it possible to handle Television signals and is substantially placed at the image focus 1 1 (i.e. in or in the vicinity of the image focal point of the main parabolic reflector 2).
  • the second LNB 7 receives from said second feed 6 downlink signals that may be in the Ku-band (10.7-12.75 GHz), amplifies the received signals with as little noise as possible and converts the same to lower frequencies for providing TV signals.
  • frequencies in the Ka band (uplink) and K band (downlink) do not overlap with the frequencies mentioned in the Ku band for television.
  • the FSR unit 3 is placed in the beam path between the feeds (i.e. respectively said first and second feeds 4 and 6) and the main reflector 2.
  • the FSR unit 3 is designed to operate differently depending on the signal frequency; in other words, signals are either transmitted through the FSR unit 3 or reflected by said FSR unit. In this case, it is desired that for a certain frequency the reflection is either very large and the transmission is very small or the transmission is very large and the reflection of the signals is very small.
  • FIGs 2 to 4 show schematically the frequency-dependent behavior of transmission and reflection of the FSR unit 3 included in the antenna unit of figure 1 for various frequencies.
  • the FSR unit 3 is designed and configured to be substantially transparent to a first radiation field 20 in the Ka or K bands (Fig.2) while reflecting a second radiation field 21 in the Ku band (Fig.3). Both radiation fields 20 and 21 may be superposed (Fig.4), resulting in a multi-band communication antenna (typically, Ku-band is dedicated to television and K- /Ka-band is dedicated to Internet access).
  • the frequency-dependent behavior of FSR unit 3 corresponds to a high-pass filter: high-frequency signals corresponding to the first radiation field 20 (i.e. for instance higher than 19.5 GHz) are transmitted while low-frequency signals corresponding to the second radiation field 21 (i.e. for instance lower than 12.75 GHz) are reflected by the FSR unit 3.
  • Each of these electromagnetic waves 20 and 21 may be represented by a plurality of beams. Because of the finite distance between the main reflector 2 and the FSR unit 3 (Fig.1 ) (or between the feeds 4, 6 and the FSR unit 3 if transmission of satellite signals is considered), each beam incidences with a different angle on the FSR unit 3. It is thus considered that the in- cident beams are not parallel. The beams of the transmitted radiation field 20 converge on the prime focus 8, whereas the beams of the reflected radiation field 21 converge on the image focus 1 1 .
  • each beam and a direction normal to the surface of the plate 30 varies according to the position of the beam on said surface.
  • three incident beams 201 , 202 and 203 are represented: upper beam 201 is incident on FSR unit 3 with an angle ⁇ greater than the angle ⁇ 2 of middle beam 202, itself greater than the angle ⁇ 3 of lower beam 203 ( ⁇ 1 > ⁇ 2 > ⁇ 3).
  • Lower beam 203 is the clos- est beam to focal points 8 and 1 1 (prime focus 8 and image focus 1 1 face the bottom of FSR unit 3).
  • the FSR unit 3 comprises a plurality (here two) of frequency selective thin plates and (such as the thin plate 30 repre- sented in the figures 5 and 6 or the thin plate 30' represented in the figure 16) as a cascade in a given defined spacing. Benefits of using two or more plates in cascade will now be explained, in relation to figures 5 to 14.
  • the figures 5 and 6 shows respectively the plan view and the side view of a thin plate 30 that may be included in the FSR unit 3 according to a first embodiment of the invention.
  • Said thin plate 30 is a single frequency selective plate with a plurality of rectangular apertures 31 .
  • the plate 30 is chosen to be square.
  • Each of the rectangular apertures 31 of the thin plate 30 is identical with edge lengths Ax and A y .
  • the arrangement is based on a square grid with a period p. Said apertures 31 are thus periodically (along both of their lengths) arranged according to a lattice structure.
  • the thickness of the plate 30 is h.
  • the plate 30 is thin which means that the inner dimensions of the apertures (either edge lengths Ax and Ay) are much larger than the thickness h.
  • the plate itself 30 is made of an electrically conductive material such as metal.
  • a material with large conductivity should be selected (for instance, cooper, silver, aluminum or brass).
  • Each of the apertures 31 may be understood as a waveguide (con- sidering the plate 30 as a two-dimensional grid with apertures having a cross-section independent of the depth) which, similarly to the case of a hollow waveguide, has a cutoff frequency fcutoff.
  • a waveguide con- sidering the plate 30 as a two-dimensional grid with apertures having a cross-section independent of the depth
  • fcutoff a cutoff frequency
  • the thin plate 30 is equivalent to an electrical two-port network, which consists of a parallel-connected coil of inductance L.
  • This equivalent circuit describes approximately the electrical behavior of the signal flow for the considered range of frequency (one has to note that the complete equivalent circuit should comprise a capacitance but the influence of such capacitance in the considered frequency range is negligible).
  • the inductance L is dependent on the extension of the waveguides perpendicular to the orientation of the electric field vector, that's it the inner dimensions Ax, A y of the apertures 31 , and on the length of the waveguide (i.e. the thickness h of the plate 30). With decreasing size (Ax and/or Ay) of the apertures 31 , the inductance L decreases and in terms of its properties approaches a short circuit. The same happens when the length h of the waveguides 31 increases. Yet, the inductance L determines the cutoff frequency of the waveguides, and consequently, transmission and reflection behavior of the plate.
  • the plates used in cascade are of the type represented in figures 5 and 6, with apertures of uniform size.
  • Such an arrangement of the FSR 3 unit is represented in figure 10.
  • the FSR unit 3 comprises:
  • said first electrically conductive plate 30A and said second electrically conductive plate 30B have the same dimension and are made of the same material; advantageously, each of the first and second plates 30A and 30B are identical to the plate 30 as shown in figures 5 and 6.
  • the plates 30A and 30B are facing each other such that an aperture of the plate 30A is face to face to a corresponding aperture of the plate 30B.
  • the distance between the plates 30A and 30B, i.e. the thickness d of the dielectric spacer 12 is substantially equal to ⁇ /4, where ⁇ is the wavelength at the cutoff frequency of the aper- tures 31 .
  • the electrically isolating spacer 12 should preferably have a relative electrical permittivity e r close to one.
  • e r relative electrical permittivity
  • materials with higher electrical permittivity can be used as well.
  • the dielectric loss angle has to be small (e.g. ⁇ 0.01 ).
  • isolating materials used for the isolating spacer 12 are Rohacell® (Evonic) or other structural foams like polystyrene.
  • Figure 1 1 shows a first equivalent circuit of the frequency selective reflective unit of figure 10.
  • Each of the single thin plates 30A and 30B is replaced by an inductance L (as discussed in relation to figure 7) while the dielectric spacer 12 is replaced by a ⁇ / 4 length transmission line.
  • a ⁇ / 4 length transmission line acts like an impedance inverter, the inverter constant of which is equal to the line characteristic impedance of the transmission line. Therefore, the transmission line with a ⁇ / 4 length and the inductor L on the right of figure 1 1 can be substituted by a capacitor C serially connected with the inductance L on the left.
  • An L-C circuit is then ob- tained, as shown in figure 12 that represents another equivalent circuit (which corresponds to a high pass filter) of the frequency selective reflective unit of figure 10.
  • the high-pass character of the circuit from figure 7 is improved by forming a cascade with the serial-connected capacitor, to make the frequency selective reflective unit of figure 10 equivalent to an L-C circuit, i.e. to a simple high-pass filter.
  • the dielectric spacer 12 should be as low loss as possible, that's why the electrical permittivity of which should be as close to one as possible.
  • the thickness d of the layer is approximately equal to ⁇ / 4, wherein ⁇ is the wavelength at the cutoff frequency fcutoff of the high-pass filter.
  • the reflection and transmission factors depends on the angle ⁇ of the beams that constitute the incident radiation field. Specifically, the transmission factor decreases when the angle ⁇ increases, whereas the reflection factor increases. Therefore, the reflection and transmission behavior of the waveguides may vary depending on their location in the plates.
  • the FSR unit 3 In a second embodiment of the FSR unit 3, it is proposed to adapt the dimensions of the waveguide in each lattice point of the plates, so that the transmission and reflection factors are the same for each beam of the inci- dent radiation field. In this way, the properties of the antenna will be preserved.
  • Such a plate 30' is schematically illustrated in figure 16.
  • the apertures 31 ' at the top of the plate 30' are made larger than the apertures 31 ' at the bottom of the plate 30'. This allows the level of the transmission factor at the top of the plate (where the incidence angle is high) and the level of the reflection factor at the bottom of the plate (where the incidence angle is low) to be raised.
  • the inner dimensions Ax, A y of the apertures 31 ' belonging to the same row of the lattice are preferably the same.
  • the angle ⁇ of the incident beams is typically comprised between 30 and 70 degrees.
  • the plates 30' are configured in the same manner as the plates 30 to form a FSR unit 3 and present the same advantages as those described in relation to figures 10 to 14.
  • this invention provides a multi-band antenna useful in any application where three radio frequency receiver or transmitter modules are operated with a single dish antenna and the three modules operate on three frequency bands and which need not be limited to the Ka and K bands and Ku-band applications described above.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Aerials With Secondary Devices (AREA)

Abstract

L'invention concerne un unité d'antenne multibande pour satellite comprenant un réflecteur principal ; une unité réfléchissante à sélectivité de fréquence ; une première ligne d'alimentation reliée à un premier convertisseur abaisseur à faible bruit, ladite première ligne d'alimentation se trouvant à un premier emplacement pour recevoir un rayonnement dans une première bande de fréquences, ledit rayonnement dans la première bande de fréquences comprenant une pluralité de faisceaux incidents réfléchis par ledit réflecteur principal et transmis à travers ladite unité réfléchissante à sélectivité de fréquence ; une deuxième ligne d'alimentation reliée à un deuxième convertisseur abaisseur à faible bruit, ladite deuxième ligne d'alimentation se trouvant à un deuxième emplacement pour recevoir un rayonnement dans une deuxième bande de fréquences inférieure à ladite première bande de fréquences, ledit rayonnement dans la deuxième bande de fréquences comprenant une pluralité de faisceaux incidents réfléchis par ledit réflecteur principal et par ladite unité réfléchissante à sélectivité de fréquence ; et un émetteur connecté à l'une desdites première ou deuxième lignes d'alimentation pour transmettre émettre un rayonnement de liaison montante vers ledit réflecteur principal. Ladite unité réfléchissante à sélectivité de fréquence comprend au moins deux plaques électriquement conductrices (30') disposées l'une en face de l'autre, chaque plaque possédant un réseau d'ouvertures (31') espacées. Les ouvertures (31') espacées de chaque plaque possèdent des dimensions intérieure (Ax1) qui augmentent avec un angle des faisceaux incidents.
EP14830538.6A 2014-08-22 2014-08-22 Unité d'antenne multibande pour satellite Withdrawn EP3183775A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/IB2014/001845 WO2016027119A1 (fr) 2014-08-22 2014-08-22 Unité d'antenne multibande pour satellite

Publications (1)

Publication Number Publication Date
EP3183775A1 true EP3183775A1 (fr) 2017-06-28

Family

ID=52396720

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14830538.6A Withdrawn EP3183775A1 (fr) 2014-08-22 2014-08-22 Unité d'antenne multibande pour satellite

Country Status (3)

Country Link
EP (1) EP3183775A1 (fr)
RU (1) RU2659303C1 (fr)
WO (1) WO2016027119A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108333788A (zh) * 2018-01-15 2018-07-27 上海机电工程研究所 射频和红外波束复合方法和模拟装置

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4476471A (en) * 1981-02-09 1984-10-09 Nippon Electric Co., Ltd. Antenna apparatus including frequency separator having wide band transmission or reflection characteristics
JPS61142806A (ja) * 1984-12-17 1986-06-30 Nec Corp 高周波分波装置
GB2328319B (en) * 1994-06-22 1999-06-02 British Aerospace A frequency selective surface
ES2153323B1 (es) * 1999-06-07 2001-07-16 Univ Madrid Politecnica Reflectores planos en tecnologia impresa multicapa y su procedimiento de diseño.
US6512485B2 (en) 2001-03-12 2003-01-28 Wildblue Communications, Inc. Multi-band antenna for bundled broadband satellite internet access and DBS television service
US20140225796A1 (en) * 2013-02-08 2014-08-14 Chien-An Chen Ultra-broadband offset cassegrain dichroic antenna system for bidirectional satellite signal communication

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
None *
See also references of WO2016027119A1 *

Also Published As

Publication number Publication date
WO2016027119A1 (fr) 2016-02-25
RU2659303C1 (ru) 2018-06-29

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