EP3811458A1 - Radiofrequency exciter of a receiving and transmitting antenna - Google Patents
Radiofrequency exciter of a receiving and transmitting antennaInfo
- Publication number
- EP3811458A1 EP3811458A1 EP19730846.3A EP19730846A EP3811458A1 EP 3811458 A1 EP3811458 A1 EP 3811458A1 EP 19730846 A EP19730846 A EP 19730846A EP 3811458 A1 EP3811458 A1 EP 3811458A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- polarizer
- access
- rectangular
- frequency band
- septum
- 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.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
- H01Q13/02—Waveguide horns
- H01Q13/0241—Waveguide horns radiating a circularly polarised wave
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/165—Auxiliary devices for rotating the plane of polarisation
- H01P1/17—Auxiliary devices for rotating the plane of polarisation for producing a continuously rotating polarisation, e.g. circular polarisation
- H01P1/173—Auxiliary devices for rotating the plane of polarisation for producing a continuously rotating polarisation, e.g. circular polarisation using a conductive element
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/213—Frequency-selective devices, e.g. filters combining or separating two or more different frequencies
- H01P1/2131—Frequency-selective devices, e.g. filters combining or separating two or more different frequencies with combining or separating polarisations
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q13/00—Waveguide horns or mouths; Slot antennas; Leaky-waveguide antennas; Equivalent structures causing radiation along the transmission path of a guided wave
- H01Q13/02—Waveguide horns
- H01Q13/0233—Horns fed by a slotted waveguide array
-
- 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
Definitions
- the invention relates to the field of space telecommunications, and more particularly to an antenna radio frequency exciter for reception and transmission in circular polarization.
- a primary antenna source is conventionally constituted by a radiating element, for example, a horn, supplied by an RF radio frequency chain essentially comprising a radio frequency exciter.
- radio frequency exciters are conventionally made up of several different devices which make it possible, on the one hand, to separate the polarizations, then on the other hand to separate the emission frequency bands and reception. Furthermore, for high speed applications, the increasing increase in the number of beams to be produced leads to an increase in the mass of the source blocks (antenna and exciter) and a criticality on the mechanical behavior of the satellites.
- sources operating in bipolarization that is to say in right circular polarization and in left circular
- Bipolarization sources for use in mono-polarization, include four ports of which only two are used. This generates an additional cost to charge the unused accesses but also an increase in the mass of the source. In addition, the integration of these charges makes it more difficult to route and integrate the electric cables running through the satellite.
- complex architectures of antenna exciter comprising absorbent charges are used.
- These architectures can include, for example, a polarization diplexer (OMT), an orthogonal mode junction coupler (OMJ), or a septum polarizer.
- OMT polarization diplexer
- OMJ orthogonal mode junction coupler
- septum polarizer a septum polarizer
- the architecture of FIG. 1 comprises a junction coupler with orthogonal mode OMJ, which makes it possible to separate the two linear components (horizontal component and vertical component) of a circularly polarized signal, and a septum polarizer PS, which makes it possible to convert a circularly polarized signal into a linearly polarized signal, and vice versa.
- the two components of the circularly polarized signal are 90 ° out of phase.
- a horn antenna A is connected to one of the ports of the OMJ coupler, while the second port of the OMJ coupler is connected to the polarizer PS.
- the polarizer PS includes three ports: a common port connected to the OMJ coupler and two rectangular ports, called right (DRx) and left (GRx) which form the reception ports of the device.
- the coupler comprises two coupling slots, each comprising a frequency filter TF, connected to a radiofrequency coupler CRF, two of whose ends form the two transmission ports of the device DTx and GTx.
- a circularly polarized signal arrives at the horn antenna A, then is sent to the OMJ junction coupler.
- the TF frequency filters filter the reception frequency band (they only let the frequencies of the transmission band pass), the received signal comes out fully towards the septum polarizer PS and is always circularly polarized.
- the polarizer PS allows the two components to be put back in phase so as to obtain a linearly polarized signal on one of the DRx or GRx accesses on reception.
- This device includes two reception accesses, in order to recover the signal received by the antenna whatever its circular polarization: left or right.
- a linearly polarized signal starts from one of the accesses in transmission DTx and GTx.
- the signal first passes through the CRF coupler, which allows the signal to be separated into two 90 ° phase shifted signals of amplitude A / 2, then these two signals pass through the TF filters before arriving in the OMJ coupler. .
- the OMJ coupler will combine these two signals in order to send a circularly polarized signal to the horn antenna A.
- the signal transmitted by the antenna A will be circularly right or circularly polarized left.
- This device has some drawbacks: it has many components (eight elementary parts), which results in a high manufacturing cost, and for mono-polarization applications, it requires two absorbent fillers, the supply of which is expensive, in particular because manufacturing times.
- the architecture of FIG. 2 comprises an OMT polarization diplexer (or “Ortho Mode Transducer” in English) connected to a 90 ° P polarizer, itself connected to an A horn.
- the OMT polarization diplexer makes it possible in particular to generate the two vertical and horizontal components of a linearly polarized signal, one associated with the signal in transmission and the other with the signal in reception.
- the horn A receives a circularly polarized signal, which is then converted into a linear polarized signal using the 90 ° P polarizer. Then this signal passes through the OMT diplexer and is recovered on the GRx reception access.
- a linearly polarized signal arrives in the OMT diplexer via the DTx transmission port.
- the signal is always linearly polarized and always includes a vertical component and a horizontal component.
- the polarizer P introduces a phase shift of 90 ° between these two components, which makes it possible to obtain a circularly polarized signal which is then transmitted by the horn A. Nevertheless, to generate the circular polarization, the polarizer P uses an oversized cavity for the receiving frequency band, which results in higher modes and limits the width of the receiving band.
- this architecture can also degrade the radiation performance of antenna A, in particular at the level of the signal to interference ratio (“Carrier to interference interference” in English, or C / l) and of cross-polarization discrimination (or XPD, "Cross polarization Discrimination "in English).
- This architecture is also limited to mono-polarization applications.
- the architecture of FIG. 3 is more complex than the first architecture, in particular at the level of the transmission chain which comprises a junction coupler in orthogonal mode OMJ with four coupling slots requiring recombination with two horizontal plane dividers D and a coupler CRF to generate circular polarization.
- This architecture includes more elementary parts and therefore generates many drawbacks in terms of assembly, mass, cost, or size. Like architecture 1, this architecture is used for mono-polarization or bi-polarization applications.
- the invention aims to overcome the aforementioned drawbacks and limitations of the prior art. More specifically, it aims to propose an exciter enabling the passage from a polarizer architecture with a single-band to dual-band septum in reception and transmission.
- An exciter according to the invention has the advantage of not comprising absorbent charges during its use in mono-polarization.
- An object of the invention is therefore a compact radio frequency exciter comprising at least one axial access intended to be connected to a radiating antenna, at least one output intended to recover signals received by said antenna and at least one input intended to transmit signals by said antenna, characterized in that it also comprises a first septum polarizer, a second septum polarizer, and a frequency filter, the two septum polarizers each comprising three ports, one of the ports being a common port and the other two access being rectangular accesses, called right and left, the second septum polarizer being connected by its common access to a first rectangular access of the first polarizer and the frequency filter being connected to the second rectangular access of the first polarizer and configured so as to filter a receive frequency band or transmit frequency band, and charac terized in that at least one of the polarizers is configured to convert a circularly polarized signal received on said axial access from the exciter into a linearly polarized signal for a reception frequency band and in that at least one second polarizer is
- the common access of the two said polarizers has a square or circular section
- the rectangular ports of the two said polarizers have a rectangular or elliptical section
- the radio frequency exciter also comprises a second frequency filter (F3) and a third septum polarizer (PS4), said second filter being connected to one of said rectangular ports of said second polarizer (PS2) and being configured so as to reject the same band of frequency that said first filter (Fl), and said third polarizer (PS4) being placed between said first polarizer (PSI) and said first filter (Fl), its common port being connected to the first polarizer (PSI) and one of its rectangular ports to the first filter (F1), and the third polarizer (PS4) being configured to convert said circularly polarized signal received on said axial access from the exciter into a linearly polarized signal for a reception frequency band or to convert said linearly polarized signal transmitted to said exciter by said input in a circularly polarized signal for a transmission frequency band;
- F3 second frequency filter
- PS4 third septum polarizer
- the radio frequency exciter also comprises a second frequency filter and a third septum polarizer, said second filter being connected to said first rectangular access of said first polarizer in parallel to said second polarizer and being configured so as to reject a reception frequency band or a band transmission frequency, and said third polarizer being connected to said second rectangular port of said first polarizer in parallel with said first frequency filter and being configured to convert said circularly polarized signal received on said axial port of the exciter into a linearly polarized signal for a band reception frequency or for converting said linearly polarized signal transmitted to said driver by said input into a circularly polarized signal for a transmission frequency band; the radiofrequency exciter also comprises a frequency filter placed between one of the rectangular ports of said first polarizer and the common port of said second polarizer or of said third polarizer; and
- the septum of each septum polarizer has a profile chosen from a step profile, a profile expressed by a spline type curve or a linear profile.
- the invention also relates to an antenna characterized in that it comprises at least one compact exciter according to an embodiment of the invention.
- the invention also relates to a satellite characterized in that it comprises at least one antenna according to an embodiment of the invention.
- FIGS 1 to 3 an antenna exciter according to the prior art
- FIG. 4a an antenna exciter according to a first embodiment of the invention and FIGS. 4b to 4e, an antenna exciter according to variants of this first embodiment;
- FIG. 5 an antenna exciter according to a second embodiment of the invention
- FIG. 6 an antenna exciter according to a third embodiment of the invention.
- FIGS. 7a, 7b and 7c the profile of blades of septum polarizers that can be used in different embodiments of the invention.
- FIG. 8 a comparison between an exciter according to the prior art and an exciter according to an embodiment of the invention.
- FIG. 9 a satellite comprising an exciter according to an embodiment of the invention.
- FIG. 4a shows an exciter according to a first embodiment of the invention.
- This first embodiment corresponds to an application in mono polarization.
- the DRx and GTx accesses define the transmission (GTx) and reception accesses (DRx) of the device.
- This includes two PSI and PS2 septum polarizers cascaded as well as a frequency filter F1.
- the two septum polarizers each have three ports: a common port and two rectangular ports, called right and left.
- a waveguide CLT is connected to the first polarizer PSI by its common access AC1 and the second polarizer PS2 is connected to the right access ADI of the first polarizer PSI by its common access AC2.
- the left access AGI of the first polarizer PSI is connected to a frequency filter F1.
- the filter F1 can be connected to this access AGI directly (case of FIG. 4a) or indirectly, for example thanks to another polarizer with septum (case in Figure 6).
- the filter F1 is optionally connected to a “waveguide section with continuously decreasing diameter” T (or type in English) or by a “step transition” and constitutes the transmission access GTx of the device.
- the right access AD2 of the second polarizer is possibly connected to a tap T and constitutes the access to reception DRx.
- the left access AG2 of the second polarizer PS2 is in this example connected to ground.
- the filter F1 only allows the transmission frequency band to pass and therefore rejects the frequencies of the reception band.
- the CLT waveguide is, for example, an adapter allowing a component of circular section to be connected to a component of square section.
- An antenna can thus be connected to the first PSI polarizer by means of this CLT waveguide, for example a horn antenna, by the AA access.
- T tapers are waveguides having different dimensions between its input and its output, which makes it possible to increase or decrease the field passing through it.
- a circularly right polarized signal arrives in the first polarizer PSI via its common access AC1.
- This circular signal comprises two linear components: a vertical component and a horizontal.
- the vertical component is parallel to the septum (or blade) of the PSI septum polarizer and that the horizontal component is perpendicular to the septum (or blade) of the PSI polarizer.
- the parallel component of the signal enters via the common access AC1 into the polarizer PSI, and leaves the polarizer PSI through the rectangular access ADI, the access AGI being provided for the signal in left polarization.
- the cut-off frequency of the PSI polarizer for the parallel component is changed by the septum of the PSI polarizer, which results in a change in the dispersion within the PSI polarizer for the parallel component.
- the septum and more particularly the profile of the septum blades, is configured so that the wavelength of this component is shorter than that of the perpendicular component.
- the parallel component therefore takes longer to traverse the polarizer than the perpendicular component, and is therefore delayed relative to the perpendicular component by a phase shift of 4) R-pSi at the output of the rectangular access ADI of the first polarizer PSI.
- the signal therefore comes out elliptically polarized from the rectangular access of the PSI polarizer.
- the frequency filter F1 is configured so as to reject signals not belonging to the transmission frequency band, the signal coming from the right access ADI by decoupling and arriving on the access AGI of the first polarizer is therefore sent back to the PSI polarizer, and more particularly towards the second rectangular access ADI. This is possible because the short-circuit plane produced by the filter F1 is positioned so as to put the latter back in phase.
- the signal passes into the second septum polarizer PS2 generating a phase shift 4) R-pS2 between the vertical (that is to say parallel to the septum) and horizontal (c '' i.e. perpendicular to the septum).
- this in particular the profile of the blades of the septum of the polarizer PS2, is configured so that the elliptically polarized signal comes out linearly polarized.
- the signal is recovered almost entirely by the right access AD2 of the second polarizer PS2 thanks to a decoupling function naturally generated by the blades constituting the septum of the first polarizer.
- R-pSi ⁇ 4> R-PS2 The sum of the two phase shifts 4) R-pSi ⁇ 4> R-PS2 is 90 °, and this sum applied by the two polarizers PSI and PS2 makes it possible to obtain a linearly polarized signal on the access in reception DRx.
- a linearly polarized signal is sent into the device by the GTx access. It first passes through the filter F1, then at the output of the filter, this signal is sent to the first PSI polarizer. At the output of the first polarizer PSI by its common access AC1, the transmitted signal is circularly polarized with an ft-psi phase shift of 90 ° then is sent to an antenna connected to the CLT waveguide.
- the first PSI polarizer and more particularly the profile of the blades of the septum of the PSI polarizer, is configured so as to convert a linearly polarized signal into a circularly polarized signal during transmission, that is to say that it is configured to create a 90 ° phase shift between the two horizontal and vertical components of a signal entering the device via the GTx transmission access.
- the first PSI polarizer being configured for transmission, it then induces a phase shift, on the horizontal and vertical components of a signal received on its common access AC1, which is as close as possible to 90 °.
- the second polarizer PS2 is therefore configured so that the sum of the phase shift induced by the first polarizer PSI and the phase shift induced by the second polarizer PS2 is 90 ° for the signals received, this makes it possible to obtain at the output of the right access AD2 of the second polarizer PS2 a linearly polarized signal.
- the phase shift induced by a septum polarizer can be adjusted by modifying the profile of the septum blades. This adjustment is generally made using digital simulations in which the profile of the septum blades is varied (number of steps, linear or curved profile, etc.) in order to obtain the desired phase shift.
- the profile of the septum of the first PSI polarizer is configured so that the phase shift between a signal received on the rectangular access AGI and exiting through the common access AC1 is 90 ° ⁇ 7 ° for a transmission frequency band.
- the profile of the septa of the first PSI and of the second PS2 polarizer is also configured so that the phase shift between a signal received on the common access AC1 of the first polarizer PSI and leaving by the rectangular access AD2 of the second polarizer PS2 is 90 ° ⁇ 7 ° for a reception frequency band.
- the second polarizer PS2 is connected to the first polarizer PSI by its left access AGI, and the filter F1 is connected to the first polarizer PSI by its right access ADI (FIG. 4b).
- the reception access GRx is always located on one of the rectangular accesses of the second polarizer PS2, and the transmission access DTx on the filter F1.
- the profile of the septum of the first polarizer PSI is configured so that the phase shift between a signal received on the rectangular ADI access and outgoing via the common access AC1 is 90 ° ⁇ 7 ° for a transmission frequency band.
- the profile of the septa of the first PSI and of the second PS2 polarizer is also configured so that the phase shift between a signal received on the common access AC1 of the first polarizer PSI and exiting through the rectangular access AD2 of the second polarizer PS2 is 90 ° ⁇ 7 ° for a reception frequency band
- the filter F1 is a filter rejecting the frequencies of the transmission band.
- the first PSI polarizer is configured so as to obtain a phase shift of 90 °, with for example a tolerance of ⁇ 7 °, between the vertical component and the horizontal component for the reception signals and the second polarizer PS2 is configured so that the sum of the phase shift induced by the first polarizer PSI and the phase shift induced by the second polarizer PS2 is 90 °, with for example a tolerance of ⁇ 7 °, between the two components for the signals in transmission.
- the phase shift introduced by the two polarizers PSI and PS2 thus makes it possible to convert the received signal circularly polarized into a linearly polarized signal and to convert the transmitted signal linearly polarized into a circularly polarized signal.
- the reception access GRx is therefore located on the output of the filter F1 and the transmission access DTx is located on one of the rectangular accesses of the second polarizer PS2 (FIG. 4c).
- the profile of the septum of the first PSI polarizer is configured so that the phase shift between a signal received on the common access AC1 and exiting through the rectangular access AGI is 90 ° ⁇ 7 ° for a frequency band of reception.
- the profile of the septa of the first PSI and of the second PS2 polarizer is also configured so that the phase difference between a signal received on the rectangular access AD2 of the second polarizer PS2 and exiting through the common access AC1 of the first polarizer PSI is 90 ° ⁇ 7 ° for a transmission frequency band.
- a second frequency filter can be placed between the two polarizers PSI and PS2 so as to: reject the signals belonging to the transmission frequency band, if the first polarizer PSI is configured to obtain a 90 ° phase shift, with for example a tolerance of ⁇ 7 °, for the signals in transmission and convert a transmitted signal linearly polarized into a circularly polarized signal ( Figure 4d) and, in this case, the transmission access GTx is on the output of the filter F1 and the reception access DRx is on one of the rectangular accesses of the second polarizer PS2; or
- the first PSI polarizer is configured to obtain a phase shift of 90 °, with for example a tolerance of ⁇ 7 °, for the reception signals and convert a received signal circularly polarized in a linearly polarized signal (FIG. 4e), and in this case, the transmission access DTx is on one of the rectangular accesses of the second polarizer PS2 and the reception access GRx is on the output of the filter F1.
- the septum profile of the first PSI polarizer is configured so that the phase shift between a signal received on the rectangular access AGI and exiting through the common access AC1 is 90 ° ⁇ 7 ° for a transmission frequency band.
- the profile of the septa of the first PSI and of the second PS2 polarizer is also configured so that the phase shift between a signal received on the common access AC1 of the first polarizer PSI and exiting through the rectangular access AD2 of the second polarizer PS2 is 90 ° ⁇ 7 ° for a reception frequency band.
- the profile of the septum of the first PSI polarizer is configured so that the phase shift between a signal received on the common access AC1 and leaving by the rectangular access AGI is 90 ° ⁇ 7 ° for a reception frequency band.
- the profile of the septa of the first PSI and the second PS2 polarizer is also configured so that the phase difference between a signal received on the rectangular access AD2 of the second polarizer PS2 and exiting through the common access AC1 of the first polarizer PSI is 90 ° ⁇ 7 ° for a transmission frequency band.
- FIGS. 4a to 4e The architecture presented in FIGS. 4a to 4e is dedicated to mono-polarization applications, this means that on the DRx reception access, the signal received from the right circular polarization will not be recovered. To recover the signal received from the left circular polarization, the reception access should be placed on the second rectangular access of the PS2 polarizer.
- FIG. 5 shows an exciter according to a second embodiment of the invention.
- This architecture is dedicated to bipolarization applications, and it allows the realization of a source with four accesses, including two for GTx and DTx transmission and two for GRx and DRx reception.
- this exciter further comprises a second frequency filter F2 placed in parallel with the second polarizer PS2 on the right rectangular access ADI of the first polarizer PSI; and a third septum polarizer PS3, placed in parallel with the filter F1 on the left port AGI of the first polarizer PSI.
- the transmitted signal is supplied at the input of the device by the GTx and DTx transmission ports.
- This signal is linearly polarized and includes a vertical component and a horizontal component.
- the two filters F1 and F2 are configured to reject signals not included in the transmission frequency band.
- the transmitted signal is therefore sent to the first PSI polarizer by its two rectangular ports ADI and AGI.
- the PSI polarizer (in particular its septum) is configured so as to phase-shift by 90 °, with for example a deviation of ⁇ 7 °, the two components of the transmitted signal to convert the linearly polarized signal into a circularly polarized signal.
- the transmitted signal leaving the first polarizer PSI via its common access AC1 is therefore circularly polarized.
- the received signal arrives at the input of the first PSI polarizer via its common access AC1.
- the signal is circularly polarized at its input. Leaving the PSI polarizer, this signal is elliptically polarized left and / or right, and comes out through the left access AGI and right ADI of the first PSI polarizer. Then it is sent to the common ports AC2 and AC3 of the two polarizers PS2 and PS3.
- the polarizers PS2 and PS3, in particular their respective septum, are configured so that the phase shift induced by the first polarizer PSI and by the polarizer PS2 or PS3 is 90 ° between the horizontal and vertical components of the received signal, with a deviation of ⁇ 7 °. This makes it possible to obtain at the output of the polarizers PS2 and PS3 on the ports AD2 and AD3, two linearly polarized signals, one coming from the received signal circularly polarized left and the second coming from the received signal circularly polarized right.
- the first PSI polarizer can be configured so that the phase shift between the two vertical and horizontal components is 90 °, with for example a difference of ⁇ 7 °, for reception signals (i.e.
- the filters F1 and F2 are configured to reject frequencies not belonging to the frequency band reception
- the polarizers PS2 and PS3 are configured so that the phase shift between the two components, induced by the two polarizers PSI and PS2 or PSI and PS3, is 90 °, with for example a deviation of ⁇ 7 °, for the signals in transmission (that is to say so as to convert a transmitted signal linearly polarized into a circularly polarized signal).
- FIG. 6 shows an exciter according to a third embodiment.
- This architecture includes four accesses: one in right reception DRx, one in left reception GRx, one in right transmission DTx and one in left transmission GTx.
- This exciter includes three polarizers PSI, PS2 and PS4 and two filters F1 and F3.
- the filters F1 and F3 are each placed at the output of one of the rectangular ports of the polarizers PS2 for F3 and PS4 for F1.
- the filters F1 and F3 are for example configured to let pass only the frequencies of the transmission band.
- the PSI polarizer performs the 90 ° phase shift for the transmission band.
- the phase shift for the reception band is then either carried out by the combination of the polarizers PSI and PS2 for the right reception, or carried out by the combination of PSI and PS4 polarizers for left reception.
- the polarizers PS2 and PS4 are also dimensioned in this example so that in the plane perpendicular to the septum of PS2 and PS4, the signal in transmission can propagate and that in the plane parallel to the septum, the signal in transmission cannot propagate.
- the polarizers PS2 and PS4 are then equivalent to rectangular guides for the transmission band.
- the filtering between the transmission and reception bands is carried out by the filters F1 and F3 to reject the frequencies in the transmission DTx and GTx the frequencies of the reception band and by an under-cut guide to reject the reception in DRx and GRx the transmission band frequencies.
- Figures 7a, 7b and 7c show the profile of the blades of a septum polarizer present in an antenna exciter according to one embodiment of the invention.
- the blades can have a step profile (Figure 7a), a profile given by a “spline” type curve ( Figure 7b) or a linear profile ( Figure 7c).
- a profile given by a “spline” type curve it is possible to adjust the phase shift of the polarizer by varying the number of points interpolated by the curve, called control points.
- the phase shift can be adjusted by the number of sections (or segments) and by their slope.
- the profile of the blades used will depend on the manufacturing technology. For example, a step profile will be preferred for machining manufacturing, while a linear or “spline” profile will be preferred for additive manufacturing.
- FIG. 8 compares an exciter according to the prior art E ant and an exciter according to an embodiment of the invention E inv for a bi-polarization application.
- the exciter according to the invention has a reduced mass up to 77% compared to the prior art and its manufacturing costs are reduced up to 82%.
- FIG. 9 shows a satellite S comprising a plurality of horn antennas A on which an exciter E according to the invention is placed.
- the mass has been reduced by about thirty kilograms.
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Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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FR1800640A FR3083014B1 (en) | 2018-06-21 | 2018-06-21 | ANTENNA RADIO FREQUENCY EXCITER IN RECEPTION AND TRANSMISSION |
PCT/EP2019/066343 WO2019243493A1 (en) | 2018-06-21 | 2019-06-20 | Radiofrequency exciter of a receiving and transmitting antenna |
Publications (1)
Publication Number | Publication Date |
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EP3811458A1 true EP3811458A1 (en) | 2021-04-28 |
Family
ID=65031124
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP19730846.3A Pending EP3811458A1 (en) | 2018-06-21 | 2019-06-20 | Radiofrequency exciter of a receiving and transmitting antenna |
Country Status (5)
Country | Link |
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US (1) | US11387563B2 (en) |
EP (1) | EP3811458A1 (en) |
CA (1) | CA3104044A1 (en) |
FR (1) | FR3083014B1 (en) |
WO (1) | WO2019243493A1 (en) |
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GB2076229B (en) * | 1980-05-01 | 1984-04-18 | Plessey Co Ltd | Improvements in or relating to apparatus for microwave signal processing |
JPS57159102A (en) * | 1981-03-26 | 1982-10-01 | Mitsubishi Electric Corp | Polarizer |
CA1260609A (en) * | 1986-09-12 | 1989-09-26 | Her Majesty The Queen, In Right Of Canada, As Represented By The Minister Of National Defence | Wide bandwidth multiband feed system with polarization diversity |
US6046702A (en) * | 1998-03-13 | 2000-04-04 | L-3 Communications Corp. | Probe coupled, multi-band combiner/divider |
US6507323B1 (en) * | 2001-03-28 | 2003-01-14 | Rockwell Collins, Inc. | High-isolation polarization diverse circular waveguide orthomode feed |
US8125400B2 (en) * | 2008-11-14 | 2012-02-28 | Norsat International Inc. | Compact antenna feed assembly and support arm with integrated waveguide |
KR102035806B1 (en) * | 2013-01-11 | 2019-10-23 | 트라네 앤드 트라네 아/에스 | A polarizer and a method of operating the polarizer |
DE102015108154B4 (en) * | 2015-05-22 | 2020-03-26 | Lisa Dräxlmaier GmbH | Two-channel polarization correction |
US10096906B2 (en) * | 2016-03-02 | 2018-10-09 | Viasat, Inc. | Multi-band, dual-polarization reflector antenna |
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2018
- 2018-06-21 FR FR1800640A patent/FR3083014B1/en active Active
-
2019
- 2019-06-20 CA CA3104044A patent/CA3104044A1/en active Pending
- 2019-06-20 WO PCT/EP2019/066343 patent/WO2019243493A1/en active Application Filing
- 2019-06-20 US US17/251,149 patent/US11387563B2/en active Active
- 2019-06-20 EP EP19730846.3A patent/EP3811458A1/en active Pending
Also Published As
Publication number | Publication date |
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CA3104044A1 (en) | 2019-12-26 |
US11387563B2 (en) | 2022-07-12 |
FR3083014B1 (en) | 2022-01-14 |
US20210257740A1 (en) | 2021-08-19 |
WO2019243493A1 (en) | 2019-12-26 |
FR3083014A1 (en) | 2019-12-27 |
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