EP2870658A1 - Antennensystem zur breitbandigen satellitenkommunikation im ghz frequenzbereich!mit hornstrahlern mit geometrischen konstruktionen - Google Patents
Antennensystem zur breitbandigen satellitenkommunikation im ghz frequenzbereich!mit hornstrahlern mit geometrischen konstruktionenInfo
- Publication number
- EP2870658A1 EP2870658A1 EP13734659.9A EP13734659A EP2870658A1 EP 2870658 A1 EP2870658 A1 EP 2870658A1 EP 13734659 A EP13734659 A EP 13734659A EP 2870658 A1 EP2870658 A1 EP 2870658A1
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- European Patent Office
- Prior art keywords
- antenna
- antenna system
- horns
- horn
- waveguide
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/06—Arrays of individually energised antenna units similarly polarised and spaced apart
- H01Q21/061—Two dimensional planar arrays
- H01Q21/064—Two dimensional planar arrays using horn or slot aerials
-
- 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
-
- 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
- H01Q13/025—Multimode horn antennas; Horns using higher mode of propagation
-
- 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
- H01Q13/0275—Ridged horns
-
- 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
- H01Q15/02—Refracting or diffracting devices, e.g. lens, prism
- H01Q15/08—Refracting or diffracting devices, e.g. lens, prism formed of solid dielectric material
-
- 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
- H01Q15/24—Polarising devices; Polarisation filters
-
- 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
- H01Q19/06—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 refracting or diffracting devices, e.g. lens
- H01Q19/08—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 refracting or diffracting devices, e.g. lens for modifying the radiation pattern of a radiating horn in which it is located
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/0006—Particular feeding systems
- H01Q21/0025—Modular arrays
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
- H01Q21/0006—Particular feeding systems
- H01Q21/0075—Stripline fed arrays
Definitions
- the invention relates to an antenna system for broadband communication between earth stations and satellites,
- the weight and size of the antenna system are very important as they reduce the payload of the aircraft and add extra weight
- the problem therefore is to provide antenna systems that are as small and lightweight as possible, which nevertheless satisfy the regulatory requirements for transmitting and receiving operation when operating on mobile carriers.
- the regulatory requirements for the transmission operation arise e.g. from the standards 47 CFR 25.209, 47 CFR 25.222, 47 CFR 25.138, ITU-R M.1643, ITU-R S.524-7, ETSI EN 302 186 or ETSI EN 301 459. All of these regulatory requirements are designed to ensure that Directional transmission operation of a mobile satellite antenna no interference may occur adjacent satellites. These are typically envelopes
- CONFIRMATION COPY given values may not be exceeded in the transmission mode of the antenna system. This leads to strict
- Antenna can be achieved. Typically, therefore
- Airplanes, parabolic mirrors are very poorly suited because of their size and because of their circular aperture. In commercial aircraft, for example, the
- Antennas mounted on the fuselage may therefore have only the lowest possible height because of the additional air resistance.
- Antenna fields which are composed of individual radiators and have suitable feed networks, however, can in any geometry and any length to
- Antenna fields are realized very low altitude.
- the problem lies in the fact that the individual radiators of the fields must support a very large bandwidth.
- horns can be designed broadband.
- reception and transmission frequencies are far apart in terms of frequency and the distance between the beam centers must be
- the horns are designed for regulatory reasons according to the minimum useful wavelength of the transmission band, then the horns are regularly so small that the receiving band can no longer be supported by them.
- the minimum useful wavelength is only about 1cm. So that the beam elements of the antenna array are tight, so no parasitic side lobes
- quadratic horn only amount to approx.
- conventional horns of this size have only a very low performance in the reception band at approx. 18 GHz - 21 GHz, since they have to be operated close to the cut-off frequency because of the finite aperture angle.
- the Ka-band can no longer support such horns or their efficiency decreases very much in this band.
- the horns are generally intended to support two orthogonal polarizations, which further restricts the geometrical margin, since an orthomode transducer, so-called transducers, becomes necessary at the horn output.
- An embodiment of the orthomode signal converter in waveguide technology fails regularly because at higher GHz frequencies not enough space is available.
- Horn radiators which are implemented in high-power technology, only very small dissipative losses.
- Waveguide components fed and the entire food network is also made of waveguide components.
- reception and the transmission band are far apart in frequency, however, the problem arises that conventional
- Waveguides can then no longer support the required frequency bandwidth.
- the required bandwidth is more than 13 GHz (18 GHz - 31 GHz).
- Rectangular waveguides can not support such a large bandwidth efficiently. This results in the following problems for mobile, in particular aeronautical satellite antennas of small size, which must be solved simultaneously:
- Phase centers of the individual emitters are less than a wavelength of maximum useful frequency apart.
- the side lobes of the antenna diagram are due to parabolic amplitude assignments of such antenna fields
- Amplitude assignments can be optimally adapted to the regulatory mask for a given antenna size
- Antenna diagram (e.g., DE 10 2010 019 081 AI, Seifried, Wenzel et al.).
- the object of the invention is to provide a broadband antenna system in the GHz frequency range, in particular for aeronautical applications, which provides a regulatory conformance with minimum dimensions
- the antenna system consists of at least four horns, the horns being two mutually
- the bandwidth of the horns can be greatly increased. This makes it possible, even wide transmit and receive bands or in large frequency spacing, as in the Ka-band, located to serve transmit and receive bands.
- the horns are designed to support two orthogonal linear polarizations. With such horns, insulations far exceeding 40 dB can be achieved. Especially with signal codings with high spectral efficiency are such isolation values
- the distance between the opposite, stepped constrictions and the opening of the associated horn cross-section is then selected in a preferred embodiment such that this
- the lower limit frequency belonging to the respective distance and to the respective horn opening can be compared with numerical
- Simulation method can be determined.
- the distance of the phase centers directly adjacent horn is smaller or at most equal to the wavelength ⁇ 3 of the highest transmission frequency below which, for regulatory reasons, must not occur grating lobes. It is also advantageous to choose the aperture of the horns rectangular, preferably so that both
- Edge lengths are less than or equal to ⁇ s s .
- the available aperture area is thus optimally utilized and a maximum antenna gain is achieved.
- ⁇ ⁇ denotes the wavelength of the lowest usable frequency and pi between 0.3 and 0.4 and p 2 between 0.25 and 0.35.
- Wavelength of the highest use frequency called. If conditions (1) and (3) are fulfilled for the antenna system's horns, then this results in a
- Antenna diagram has parasitic side lobes (grating lobes) and also can have a maximum antenna gain in all Nutzfrequenzb.
- Antenna systems are especially for aeronautical
- the individual radiators support a first and a second polarization and the two polarizations are mutually orthogonal.
- the signals of the two orthogonal polarizations are carried in separate feed networks, which has the advantage that with the aid of corresponding components, such as e.g. Polarizers or 90 ° hybrid couplers, both linearly polarized signals and circularly polarized signals sent, or
- the antennas may have the smallest possible size and nevertheless a regulatory compliant transmission mode with maximum spectral power density is possible, is also in accordance with an advantageous development of the
- Single radiator is dimensioned so that for direct
- At least four adjacent individual radiators are also located in different directly adjacent modules, then at least one direction is defined by the antenna field, so that for this direction the distance of the phase centers of the individual radiators is less than or equal to the wavelength of the
- support in question. These are e.g. rectangular or
- Such rectangular modules can be assembled in a space-saving manner to antenna fields.
- the rectangular modules can be fed in a relatively simple manner with binary microstrip networks.
- horn horns which are among the lowest loss antennas. Both horns with rectangular and with a round aperture can be used. If grating-lobes are not to occur in any section through the antenna pattern, horns are square
- Wavelength of the highest transmission frequency is the reference frequency at which no grating lobes may occur.
- the horns can be advantageously carried out as a dielectrically filled horns.
- the effective wavelength in the horns increases and these are able to support much larger bandwidths than would be the case without filling.
- dielectric fillings lead to parasitic losses through the dielectric, these losses remain comparatively small, especially in the case of very small horns.
- a dielectric filling with a dielectric constant of about 2 is sufficient. With only a few centimeters deep horns this leads to the use of suitable materials
- the horns designed as stepped horns (step horns") by adjusting the width and length of the stages, as well as the number of stages, can then the antenna can be optimally adapted to the respective usable frequency bands.
- a further improvement in the reception power, especially in the case of very small horn radiators, can be achieved by providing the individual horn radiators with a dielectric
- Cross-septum or a dielectric lens can be equipped.
- the insertion loss (Sn) in the reception band can be significantly reduced by such structures, even if the aperture areas of the individual radiators are already so small that a free-space wave without these additional dielectric structures would already be almost completely reflected.
- Total number of individual radiators N and any values of the number of individual radiators in a module Ni is so minimal.
- the binary trees are in the general case neither
- Antenna system can be designed as complete and fully symmetrical binary trees and all individual radiators can equal length feeder lines, i. also similar
- microstrip lines are located on a thin substrate and are guided in closed metallic cavities, wherein the cavities are typically filled with air.
- a substrate is typically referred to as being thin if its thickness is smaller than the width of the microstrip lines.
- the modules of the antenna system can then be assembled from a few layers.
- the layers of aluminum or similar electrically conductive materials which can be structured with the known structuring methods (milling, etching, lasers, wire erosion, water cutting, etc.).
- the microstrip networks are with
- the microstrip line lies together with its
- Substrate in a cavity which consists of two half-shells.
- the walls of the cavity can be electrically closed by the substrate with electrical
- constrictions By such constrictions, the useful bandwidth can be greatly increased.
- the number and arrangement of constrictions depend on the design of the antenna system.
- double-ridged waveguides are advantageous, which is a significantly larger
- dielectrically filled waveguides are used for the waveguide supply networks.
- Waveguides require much less space than
- air-filled waveguide can also be a part or a whole
- Waveguide network consist of dielectric filled waveguides. Also a partial filling is possible.
- LNA low-noise amplifier
- Equip food networks with frequency diplexers separate the reception from the transmission band.
- waveguide diplexers are advantageous because they can achieve a very high isolation and are also very low attenuation.
- each module of the antenna array is equipped with a diplexer directly at its output or input.
- At the input and output of these diplexers are then all signal combinations in pure form: polarization 1 in the receiving band, polarization 2 in the receiving band, polarization 1 in the transmission band and polarization 2 in the transmission band.
- the modules can then be interconnected by four corresponding waveguide networks. This embodiment has the advantage that the waveguide feed networks do not have to be very broadband in terms of frequency because they each only have to be suitable for signals of the receiving or transmitting band.
- both the intra-modular Microstrip lines networks as well as the inter-modular waveguide networks are designed so that they can simultaneously support the transmitting and the receiving band.
- the antenna is provided with frequency diplexers, which are connected to a suitable radio-frequency switching matrix ("switching matrix"), then dynamic switching between the orthogonal polarizations is possible
- Such embodiments are particularly advantageous if the antenna is to be used in satellite services which work with the so-called “spot beam” technology.
- spot beam technology is produced on the earth's surface
- Coverage areas (cells) of relatively small area typically diameter in the Ka-band about 200km -300km. To be able to use the same frequency bands in neighboring cells
- the antenna is used in satellite services in which the polarization of the received or transmitted signal is fixed and changes neither temporally nor geographically, then it is advantageous if the first intra-modular
- Microstrip line network and the associated inter-modular waveguide network on the receiving band of the Antennne, and the second intra-modular microstrip line network and the associated inter-modular waveguide network are designed for the transmission band of the antenna system.
- This embodiment has the advantage that the respective feed networks can be optimized for the respective usable frequency band, and thus a very low-loss antenna system of very high performance is created.
- 90 ° hybrid couplers are four-ports which convert two orthogonal linearly polarized signals into two orthogonal circularly polarized signals and vice versa. With such arrangements, it is then possible to send or receive also circularly polarized signals.
- the antenna array for receiving and transmitting circularly polarized signals with a
- polarizer so-called polarizer.
- these are suitably structured metallic layers ("layers") lying in a plane approximately perpendicular to the propagation direction of the electromagnetic wave, the metallic structure acting in such a way that it is capacitive in one direction and inductive in the orthogonal direction two orthogonally polarized signals, this means that a phase difference is imposed on the two signals: if the phase difference is now set to be just 90 ° passing through the polarizer, then two orthogonal linearly polarized signals are converted into two orthogonal circularly polarized signals ,
- the polarizer advantageously consists of several layers, which are mounted at a certain distance (typically in the region of a quarter wavelength) from each other.
- a particularly suitable embodiment of the polarizer is a multi-layer spolarisator. Here are the usual patterning metallic
- the typical distance of the polarizer to the aperture surface of the antenna array is in the range of a wavelength of the useful frequency and the tilt angle
- Parabole amplitude assignments of the aperture are particularly suitable in the case of flat aperture openings for this purpose. Parabole amplitude assignments are thereby
- Antenna field system preferably designed so that it acts at least along the direction through the antenna system in which the radiating elements are dense.
- the radiating elements are dense in the direction in which the
- Distance of the phase centers of the individual radiators is less than or equal to the wavelength of the highest transmission frequency, at which no significant parasitic sidelobes (grating lobes) may occur.
- Fig. La-b show schematically an inventive
- Antenna module which consists of a field of 8 x 8
- FIG. 2a-b show exemplary
- Fig. 3a-d illustrate schematically the exemplary structure of an antenna according to the invention from antenna modules and the
- Fig. 5 shows schematically the detailed structure of a 2 x 2
- Antenna module of four-toothed (“quad-ridged")
- Figures 6a-b show an exemplary 8x8 antenna module consisting of dielectrically filled horns
- FIGS. 7a-d illustrate the exemplary detailed construction of a single dielectrically filled horn radiator
- Fig. 8 shows schematically the detailed structure of a 2 x 2 module of dielectrically filled horns
- Fig. 9 shows a module according to the invention which is provided with a dielectric grid for improving the impedance matching
- Figures lla-d show the detailed structure of a module according to the invention in layering technology
- Fig. 12 shows schematically the vacuum model of a
- FIG. 13 shows the exemplary structure of a waveguide power splitter composed of double-ridged waveguides
- Fig. 14 schematically shows a position of a polarizer
- Fig. 15a-b show an example of a schematic
- Fig. 16 shows a possible construction of a fixed polarization antenna system according to the invention of the transmitting and receiving signals in the form of a block diagram
- Fig. 17 shows a possible construction of a variable polarization antenna system according to the invention of the transmitted and received signals using 90 ° hybrid couplers in the form of a block diagram
- Fig. 18 shows schematically the structure of an antenna system according to the invention with variable polarization of the transmitting and Receive signal using a polarizer in the form of a block diagram.
- Fig. 1 illustrates an exemplary embodiment of a
- Antenna module of an antenna according to the invention.
- Single emitters 1 are here designed as rectangular horns, which can support two orthogonal polarizations.
- the intra-modular microstrip line networks 2, 3 for the two orthogonal polarizations are located between different layers.
- the antenna module consists of a total of 64 primary
- the dimensions of the individual radiators and the size of their aperture areas is chosen so that the distance of the phase centers of the individual beam elements along both major axes smaller than ⁇ m i n where m ⁇ i n denotes the wavelength of the highest useful frequency. This distance ensures that parasitic sidelobes, so-called “grating lobes", can not occur in any direction in the antenna diagram up to the highest usable frequency (reference frequency).
- both microstrip line networks provide a 64: 1
- FIG. 2 An exemplary internal organization of the two microstrip line networks is shown in FIG. 2
- the modules comprise a smaller or larger number of horns.
- K / Ka band antennas e.g. 4 x 4 modules are optimal.
- the microstrip networks then represent a 16: 1 power divider that receives the signals from 16
- microstrip lines in this case are relatively short and their noise contribution therefore remains small.
- an antenna with optimum performance parameters can be constructed by appropriate design of the module sizes.
- the modules are only made as large as necessary in order to feed them with waveguides can.
- Microstrip lines are thereby minimized.
- the two microstrip line networks 2, 3 couple the merged signals into polarization-to-waveguide couplings 4, 5 separately according to polarizations, as shown in FIG. 1b.
- This waveguide couplings 4, 5 can be any number of modules with the help of
- Waveguide networks are coupled efficiently and low attenuation to an antenna system according to the invention.
- FIG. 2 shows two exemplary microstrip line networks 2, 3 for feeding the individual radiators 1 of the 8 ⁇ 8
- the sum signal is sent to the
- waveguide feedthroughs 4b and 5b are also located on the corresponding board in order to create an opening and the connection to the waveguide couplings 4a and 5a, respectively.
- the microstrip line networks 2, 3 can be made by any known method. Whereby low-loss substrates for antennas are particularly suitable.
- FIG. 3 shows by way of example how different antenna modules 8 can be coupled to antenna systems according to the invention.
- Antenna systems according to the invention consist of a number M of modules, where M must be at least two.
- M must be at least two.
- modules may e.g. also be arranged in a circle. Also, not all modules must have the same size (number of individual emitters).
- the modules 8 are now connected to each other by means of the waveguide networks 9, 10.
- the corresponding waveguide coupling-in points 11, 12 of the waveguide networks 9, 10 are connected to the corresponding waveguide couplings 4, 5 (compare Fig. 1b) of the individual modules 8.
- the waveguide networks 9, 10 themselves each represent an M: 1 power divider, so that the two orthogonally polarized signals are fed to the sum ports 13, 14 in the
- waveguides 9, 10 can be provided with a wide variety of waveguides, such as, for example, waveguide networks.
- waveguides such as, for example, waveguide networks.
- Conventional rectangular or round waveguides or broad-band toothed ("ridged") waveguides are used, and dielectrically filled waveguides are also conceivable.
- Waveguide network which connects directly to the waveguide coupling 4, 5, to fill with a dielectric.
- the dimensions of the dielectrically filled waveguides are then significantly reduced, so that their space requirement is minimal.
- the antenna shown in Fig. 3 is thus constructed according to claim 1:
- the individual radiators 1 are dimensioned (see Fig. 1), that for at least one direction through the antenna field of the
- Distance of the phase centers of the horns is less than or equal to the wavelength of the highest transmission frequency at which no grating lobes may occur.
- the individual radiators 1 are fed separately for each of the two orthogonal polarizations by microstrip lines (see Fig. 2, microstrip-to-waveguide couplings 6, 7).
- microstrip lines of one orthogonal polarization are the first intra-modular
- Microstrip line network 2 connected and the
- Microstrip lines of the other orthogonal polarization are the second intra-modular
- microstrip network 3 connected.
- the first micro-strip intra-modular network 2 is coupled to the first inter-modular waveguide network 9 and the second micro-strip intra-modular network 3 is coupled to the second inter-modular waveguide network 10 such that the first inter-modular waveguide network 9 receives all of the one orthogonal signals Polarization at the first sum port 13 merges and the second inter-modular waveguide network 10 all signals of the other orthogonal polarization at the second summing port 14 merges.
- microstrip line networks 2, 3 and the waveguide networks 9, 10 are here as complete and
- FIGS. 3c and 3d show a physical realization of a corresponding antenna system.
- the modules 8 consist of single radiators 1 and have two different sizes, i. the number of individual radiators 1 per module 8 is not the same for all modules 8.
- the middle four modules 8 each have 8 individual emitters 1 more than the other four modules 8.
- the height of the antenna system at the left and right edges is less than in the central area.
- Such embodiments are particularly advantageous when the antenna system must be optimally adapted to an aerodynamic radome.
- the modules 8 are fed separately with two waveguide networks 9 and 10 for each polarization.
- the waveguide networks 9, 10 are located in two separate layers behind the modules and the modules are connected to the waveguide networks 9, 10 through the coupling points 11, 12, which are coupled to the waveguide couplings of the modules 4, 5 ,. Both waveguide networks 9, 10 are realized here as cutouts.
- the aperture of the single radiator 1 may be at most 1cm x emper large (A m i n is learning).
- the primary single emitters 1 are designed as "ridged" horn emitters, which have a much wider horn than conventional horn emitters
- the impedance matching of such toothed horns to the free space then takes place according to the method of antenna physics.
- the serrated horns are designed to support two orthogonal polarizations. This is e.g. is achieved by virtue of the fact that the horns are quadruple symmetrically toothed ("quadrideged") .
- the signals of the orthogonal polarizations are supplied and removed by separate microstrip line networks 2, 3.
- FIG. 4 a schematically shows the detailed construction of a horn radiator equipped with symmetrical geometric constrictions using the example of a four-toothed tooth
- the Horn 1 consists of three segments (layers), with the two between the segments
- Microstrip networks 2,3 are located.
- the horns 1 are symmetrical with geometric
- Polarization directions are provided, which extend along the propagation direction of the electromagnetic wave.
- Such horns are referred to as "toothed" horns.
- Fig. 4a Shown in Fig. 4a is an exemplary quadruple
- Frequency-wise far-reaching transmit and receive tapes can support without substantial losses in the efficiency.
- An example of this are K / Ka band satellite antennas.
- the reception band lies at 18 GHz - 21 GHz and the transmission band at 28 GHz - 31 GHz.
- the depth, width and length of the steps depend on the desired frequency bands and can be numerical
- Microstrip line networks 2, 3 typically occur at the narrowest point of the constrictions 15, 16 for the respective polarization direction, which is a very broadband
- Fig. 4d shows schematically a part of the longitudinal section through a toothed horn at the location of two opposing constrictions 16.
- the constrictions 16 are stepped
- the horn itself is stepped (see Fig. 4a-c), so that at each stage, the edge length ai of the horn opening in the corresponding cross section from the aperture of the horn to the horn end also decreases.
- Waveguide-zuikrostMail einskopplung penetrate, and there are coupled or disconnected.
- Edge length a of the aperture in the corresponding cross-section through the horn and the distance di contains described.
- Fig. 5 the inventive structure of a 2 x 2 antenna module is shown schematically, which consists of four quadruple
- Microstrip line networks 2, 3, and outcoupling of the microstrip line networks 2, 3 on the waveguide coupling 4, 5 has.
- the constrictions as symmetrical teeth 15, 16 of the horns 1 are also shown.
- the two orthogonally polarized signals pole 1 and pole 2 their reception or radiation from the horns. 1
- Microstrip line network 2, 3 is fed or extracted from this.
- microstrip line networks 2, 3 are designed as binary 4: 1 power dividers and couple the
- the distance of the phase centers of two adjacent horns 1 in the vertical direction is smaller than ⁇ m i n , so that at least in this direction in the antenna diagram no
- grating lobes unwanted parasitic side lobes
- phase centers of the horns 1 coincide with the beam centers of the horns 1. In general, however, this is not
- FIG. 6 shows a further embodiment of the invention.
- the antenna modules of dielectric filled horns 18 are constructed. The one with one
- Dielectric 19 filled horns 18 are here
- microstrip line networks 2 and 3 are arranged, for example, in an 8 ⁇ 8 antenna field and are coupled to one another via the microstrip line networks 2 and 3.
- the microstrip line networks 2, 3 couple the
- FIGS. 7a-c show the internal structure of a single horn radiator 18 completely filled with a dielectric.
- the dielectric packing (dielectric) 19 also consists of three segments, each defined by the microstrip line networks 2, 3.
- the individual radiators 1 can support two widely spaced frequency bands, they are designed stepped in their interior, as shown in the sections Fig. 7b-c is exemplified.
- the extraction or coupling of the highest frequency band is typically carried out at the narrowest or lowest point by the
- Microstrip line network 3 which is furthest away from the aperture opening of the single radiator 1.
- the lower frequency band is switched on or coupled in at a further point to the aperture opening, by a microstrip line network 2.
- the depth, width and length of the steps depends on the desired frequency bands and can also be used here
- the horn 1 can also be designed so that both inputs and outputs can support both the transmit and the receive frequency band.
- the dielectric filling body 19 is also designed to match exactly stepped.
- the shape of the filling body 19 on the aperture surface depends on the
- the filler 19 can be performed flat as shown at the aperture opening. However, there are also other, for example, inward or outward curved versions possible.
- dielectrics come a variety of known materials such as Teflon, polypropylene, polyethylene, polycarbonate, or polymethylpentene in question.
- Teflon a dielectric with a dielectric constant of about 2 is sufficient (eg Teflon,
- the horn antenna 18 is completely filled with a dielectric 19.
- a dielectric 19 there are also embodiments with only
- the advantage of using dielectrically filled horns is that the horns themselves have a much less complex internal structure than in the case of toothed horns.
- Fig. 7d an advantageous embodiment of a stepped executed dielectrically filled horn radiator, which has a rectangular aperture is shown schematically.
- FIG. 7 d shows the view of the horn from above (top view) with the aperture edges ki and k 2 , as well as the longitudinal sections through the horn antenna along the lines AA 'and BB'.
- the horn is now designed so that a first
- the edge k E is now selected so that the associated lower limit frequency of a dielectric filled waveguide with a long edge k E below the lowest useful frequency of the receiving band
- Antenna system is located, then the horn can the
- edge k s chosen so that the associated lower limit frequency of a dielectric filled waveguide with a long edge k s is below the lowest useful frequency of the transmission band of the antenna system
- Horns also support the broadcast band, and this is true even if the reception band and transmission band are far apart.
- edge k s is orthogonal to the edge k E in FIG. 7 d
- two orthogonal linear polarizations are simultaneously supported by such a horn since the corresponding waveguide modes are linearly polarized and orthogonal to one another.
- Such stepped horn radiators can also without or with partial dielectric filling accordingly
- the edge lengths ki and k 2 of the rectangular aperture of the horns so
- both ki and k 2 are smaller or highest equal to the wavelength of the reference frequency, which is in the transmission band of the antenna.
- the available space is then optimally utilized and a maximum antenna gain is achieved.
- FIG. 8 shows an exemplary 2 ⁇ 2 antenna module that consists of four dielectrically filled horns 18. As illustrated in FIG. 7b-c, the inputs and / or outputs in the microstrip line networks 2, 3 are completely embedded in the dielectric 19 here. Otherwise, the module does not differ from the corresponding toothed module
- Microstrip line networks 2, 3 are each with the
- Waveguide couplings 4, 5 connected.
- the module is equipped with a dielectric grid 20 extending over the entire aperture opening.
- dielectric grids 20 may be the
- Impedanzanpassung especially at the lower frequency band of the individual radiator 1 greatly improve by near the aperture openings of the single radiator 1, the effective
- the dielectric grid 20 need not be regular or periodic. For example, e.g.
- the grating for the horns 1 at the edge of the antenna has a different geometry than for the horns 1 in the center. This could be e.g. Model edge effects.
- FIG. 10a-b illustrates an exemplary module that is incorporated in FIG.
- modules according to the invention can be produced particularly cost-effectively.
- the first layer consists of an optional polarizer 21, which is used in circularly polarized signals.
- the polarizer 21 converts linearly polarized signals into circularly polarized and vice versa, depending on the polarization of the incident signal. So be on the antenna system
- Horn radiators of the module can be received lossless.
- the linearly polarized signals radiated from the horns are converted into circularly polarized signals and then radiated into the clearance.
- Horn radiator field which includes the primary horn structures 22 without input or output unit.
- the following layers 23a, 2 and 23b form the input or
- microstrip line network 2 of the first polarization and its substrate are embedded in metallic carriers (layers) 23a, 23b.
- the carriers 23a, 23b have recesses (notches) at the locations where a microstrip line runs (see also FIG.
- microstrip line network 3 of the second, orthogonal polarization with its substrate is embedded in the carriers 23b, 23c.
- Waveguide terminations 24 are electrically conductive and can be inexpensively with the known methods of
- Metal machining eg made of aluminum (eg milling, laser cutting, water jet cutting, electro erosion).
- metal machining eg. milling, laser cutting, water jet cutting, electro erosion.
- Aircraft is beneficial.
- Antenna module provided.
- the postage technique described can be used both for
- Figs. 11a-d show the detailed structure of the microstrip line networks 2, 3 embedded in the metallic carriers.
- the recesses (notches) 25 are made such that the
- Microstrip lines 26 of the microstrip network 2, 3 run in closed metallic cavities. The microwave losses are thereby minimized.
- Microstrip lines 26 between the metallic layers remains a gap through which microwave power could escape, is also provided to provide the substrates with metallic vias 27 at the edges of the notches, so that the metallic supports are galvanically connected, and so the cavities be completely closed electrically. Are the vias 27 along the
- the plated-through holes 27 are flush with the metallic walls of the cavity 25.
- the electromagnetic properties of such a structure are similar to those of an air-filled coaxial line.
- Vias are also omitted, as well without Vias then virtually no microwave power can escape through the then very narrow slots.
- the Hornstrahlereinkopplitch or -auskopplungen 6, 7 are integrated directly into the metallic carrier.
- Fig. 12 shows the vacuum model of an exemplary 8 x 8 antenna module.
- the horns 1 are tightly packed and still leaves more than enough space for the
- Waveguide couplings 4, 5 A dielectric grating 20 is mounted in front of the aperture plane.
- Waveguide networks which couple the modules together made up of toothed waveguides. This has the advantage that toothed waveguide a much larger
- Frequency bandwidth can have as conventional
- Waveguide or can be designed specifically for different utility bands.
- FIG. 1 An exemplary network of doubly toothed waveguides is shown schematically in FIG. The rectangular ones
- Waveguides are provided with symmetrical geometric constrictions 29, which are supplemented at the location of the power divider by vertical constrictions 30.
- the design of the toothed waveguide and the corresponding power divider can be done with the methods of numerical
- Waveguides of the inter-modular waveguide networks completely or partially filled with a dielectric. Such fillings can with the same frequency use the space requirement in
- FIG. 14 shows by way of example a position of such
- multilayer meander polarizers are used.
- a low-loss layer of foam material e.g., Rohacell, XPS
- a thickness in the region of one quarter of a wavelength With lower axle ratio requirements, however, fewer layers may be used. Likewise, more layers can be used if the axis ratio requirements are high.
- An advantageous arrangement is a 4-layer meander polarizer with the axial ratios of less than 1 dB can be achieved, which is usually sufficient in practice.
- the design of the meander polarizers depends on the useful frequency bands of the antenna system and can be done with methods of numerical simulation of such structures.
- the meandering lines 31 are in the embodiment of FIG. 14 at an angle of about 45 ° to the main axes of the antenna. This leads to incident, linearly polarized along a major axis signals are converted into circularly polarized signals. Depending on which main axis the
- Signals are polarized linearly produces a left circularly polarized or a right circularly polarized signal.
- geometric structures as meanders.
- passive geometric conductor structures known, with which linear polarized can be converted into circularly polarized signals. It depends on the application, which structures are most suitable for the antenna.
- the polarizer 21 may be placed in front of
- Aperture opening can be installed. This makes it possible in a relatively simple manner, the antenna for both linear
- Antenna equipped with a parabolic amplitude assignment which is realized by a corresponding design of the power dividers of feed networks. Since the antenna pattern must be below a mask prescribed by regulations, such amplitude assignments can achieve much higher maximum permitted spectral EIRP densities in the transmit mode than without such assignments. This is especially important for antennas with a small aperture area
- Fig. 15a such an amplitude assignment is shown schematically.
- the power contributions of the individual horns fall from the center of the aperture to the edge.
- this is exemplified by different degrees of blackening (dark: high power contribution, bright: low power contribution).
- the contributions to performance fall in both main axis directions (azimuth and elevation). This results in an approximately optimally matched to the regulatory mask antenna pattern for all angles of rotation ("skew").
- Fig. 15b is an example of one in both
- EIRP SD spectral EIRP density
- the EIRP SD would be about 8 dB lower in the range of 0 ° skew to about 55 ° skew, and in the range of about 55 ° skew to about 90 ° skew by about 4 dB lower.
- Figs. 16-18 show the basic structure of a series of antenna systems according to the invention with different
- the antenna system is particularly suitable for applications in the K / Ka band (reception band about 19.2 GHz -20.2 GHz, transmission band about 29 GHz -30 GHz), in which the polarizations of the transmitting and the Received signal are fixed and orthogonal to each other (ie, the polarization direction of the signals does not change).
- a polarizer 21 is initially provided. This is followed by an antenna field 32, which is constructed either of four-toothed ("quad-ridged”) horn radiators or of dielectrically filled horn radiators
- Aperture openings of the individual horns typically have dimensions of smaller learning x in this frequency range.
- the antenna array 32 is according to the invention in modules
- Polarizations has separate microstrip line couplings 33, which in turn after
- Microstrip network 36 are connected.
- the microstrip line network 36 Since the polarization of the transmit and receive signals is fixed and is typically orthogonal to one another, it is provided here that the microstrip line network 36 has one polarization on the transmit band and the
- the G / T of the antenna becomes optimal.
- the polarizer 21 is oriented such that the signals in the transmission band 34 are right-handed circular and the signals in the reception band 35 are circularly polarized left-handed.
- different waveguide cross sections can be used for the receive band waveguide network and the transmit band waveguide network.
- a receive band frequency filter 39 is provided to protect the low noise receive amplifier, which is typically mounted directly on the receive band output of the antenna, from being overdriven by the strong transmit signals.
- Transmission band filter 40 is provided. This is e.g. then
- HPA transmit band power amplifier
- FIG. 16 of an antenna system according to the invention has a further, in particular for
- Satellite antennas very important advantage. Since the transmit band feed network and the receive band feed network are completely separated both at the microstrip line level and at the waveguide level, it becomes possible to use different amplitude assignments for the two networks.
- the receive band feed network is homozygously occupied, i. the power contributions of all horns of the antenna are equal in the receiving band and all power dividers both at the level of the receiving band
- Microstrip line network as well as at the level of the receive waveguide network are symmetrical 3dB power dividers when the feed network is constructed as a complete and fully symmetric binary tree.
- Antenna gain is achieved so that the antenna in the receiving band is maximally efficient and the ratio of antenna gain and noise G / T of the antenna is maximum.
- the transmit band feed network can thus be parabolic regardless of the receive band feed network
- Amplitude assignment are provided that the regulatory compliant spectral EIRP density is maximum.
- Amplitude assignments of the antenna gain are not critical, because this is due to the design limited only to the transmission band and does not affect the receiving band.
- the essential features of satellite antennas, especially satellite antennas of small size, are the G / T and the maximum regulatory compliant spectral EIRP density.
- the G / T is directly proportional to the data rate that can be received via the antenna.
- the maximum regulatory EIRP spectral density is directly proportional to the data rate that can be transmitted with the antenna.
- Hyperbolic amplitude assignments are characterized by the fact that the power contributions of the individual radiators of the antenna field increase from the middle to the edge.
- the antenna system initially consists of an antenna array 41 of broadband, dual polarized horns, e.g. fourfold toothed horns, which are organized according to the invention in modules.
- Each horn receives or transmits two orthogonal linear polarized signals which, however, are also complete in operation with circularly polarized signals
- the essential difference from the embodiment in FIG. 16 consists in the fact that at the level of the feed networks, it is not separated into a receive band and a transmit band feed network, but the signals are separated only according to their different polarization.
- Microstrip line network merged all signals of orthogonal polarization 43 in the second
- the two microstrip line networks 36 are designed such that they both the transmission band and the
- microstrip line networks 36 of the present invention are typically already broadband by design (coaxial line like construction)
- Receive and transmit band can support simultaneously, after the transition 37 microstrip-to-waveguide waveguide networks 44, if very large bandwidths
- frequency diplexers 45, 46 For the separation of receive band and transmit band signals, two frequency diplexers 45, 46 are provided, one for each polarization.
- the frequency diplexers 45, 46 are e.g.
- Hybrid couplers 47, 48 are e.g. low-attenuation
- Receive 49 and transmit band 50 each right-handed and left-handed circular) simultaneously.
- the antenna system can also be used for simultaneous operation with four different linearly and four different circularly polarized signals be used. Also many other combination possibilities and the appropriate ones
- Polarized signals used a polarizer 21 instead of the 90 ° hybrid coupler 47, 48 of the structure of FIG. 17.
- the feed networks 36, 44 process again two orthogonal polarizations separated from each other (in this case left-circular and whilzikular) and are each designed correspondingly broadband for the receiving band and the transmission band.
- the frequency diplexers 45, 46 are then directly the four polarization combinations of circularly polarized signals simultaneously.
- the frequency-diplexer 45 for the first circular polarization the signal in the receive and transmit band, at
- Frequency diplexer 46 for the second (to the first orthogonal) circular polarization the signal in the receive and transmit band.
- the structure according to FIG. 18 can also be designed for the operation of linearly polarized signals, or it is possible with the corresponding circuit matrix a simultaneous operation with circular and linearly polarized signals.
- Hybrid couplers are needed. This may vary depending on the application eg space or weight saving. Also, there may be cost benefits.
- the advantage of the structure according to FIG. 17, lies in the fact that, in operation with circularly polarized signals, the axis ratio of the circularly polarized signals can be freely adjusted via the respective power contributions at the input of the 90 ° hybrid couplers 47, 48.
- radomes by the radome material and the radome curvature can have polarization anisotropies that cause the axis ratio of circularly polarized signals to be greatly altered as it passes through the radome.
- Cross polarization isolation can fall sharply, which can severely degrade the achievable channel separation and ultimately leads to a degradation of the achievable data rate.
Landscapes
- Waveguide Aerials (AREA)
- Variable-Direction Aerials And Aerial Arrays (AREA)
Abstract
Description
Claims
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DE102012013130 | 2012-07-03 | ||
PCT/EP2013/001923 WO2014005691A1 (de) | 2012-07-03 | 2013-07-02 | Antennensystem zur breitbandigen satellitenkommunikation im ghz frequenzbereich|mit hornstrahlern mit geometrischen konstruktionen |
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EP2870658A1 true EP2870658A1 (de) | 2015-05-13 |
EP2870658B1 EP2870658B1 (de) | 2019-10-23 |
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EP15178569.8A Withdrawn EP2955788A1 (de) | 2012-07-03 | 2013-07-02 | Antennensystem zur breitbandigen satellitenkommunikation im ghz frequenzbereich mit dielektrisch gefüllten hornstrahlern |
EP13734661.5A Withdrawn EP2870659A1 (de) | 2012-07-03 | 2013-07-02 | Antennensystem zur breitbandigen satellitenkommunikation im ghz frequenzbereich mit dielektrisch gefüllten hornstrahlern |
EP13734662.3A Active EP2870660B1 (de) | 2012-07-03 | 2013-07-02 | Antennensystem zur breitbandigen satellitenkommunikation im ghz frequenzbereich mit speisenetzwerk |
EP13734659.9A Active EP2870658B1 (de) | 2012-07-03 | 2013-07-02 | Antennensystem zur breitbandigen satellitenkommunikation im ghz frequenzbereich mit hornstrahlern mit geometrischen konstriktionen |
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EP15178569.8A Withdrawn EP2955788A1 (de) | 2012-07-03 | 2013-07-02 | Antennensystem zur breitbandigen satellitenkommunikation im ghz frequenzbereich mit dielektrisch gefüllten hornstrahlern |
EP13734661.5A Withdrawn EP2870659A1 (de) | 2012-07-03 | 2013-07-02 | Antennensystem zur breitbandigen satellitenkommunikation im ghz frequenzbereich mit dielektrisch gefüllten hornstrahlern |
EP13734662.3A Active EP2870660B1 (de) | 2012-07-03 | 2013-07-02 | Antennensystem zur breitbandigen satellitenkommunikation im ghz frequenzbereich mit speisenetzwerk |
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US (3) | US9660352B2 (de) |
EP (4) | EP2955788A1 (de) |
CN (3) | CN104428949B (de) |
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- 2013-07-02 EP EP13734661.5A patent/EP2870659A1/de not_active Withdrawn
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- 2013-07-02 WO PCT/EP2013/001925 patent/WO2014005693A1/de active Application Filing
- 2013-07-02 US US14/412,584 patent/US9660352B2/en active Active
- 2013-07-02 EP EP13734662.3A patent/EP2870660B1/de active Active
- 2013-07-02 US US14/412,560 patent/US10211543B2/en active Active
- 2013-07-02 WO PCT/EP2013/001923 patent/WO2014005691A1/de active Application Filing
- 2013-07-02 CN CN201380035959.2A patent/CN104428950B/zh active Active
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- 2013-07-02 US US14/412,626 patent/US9716321B2/en active Active
- 2013-07-02 CN CN201380035909.4A patent/CN104428948B/zh active Active
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EP2870658B1 (de) | 2019-10-23 |
CN104428950A (zh) | 2015-03-18 |
EP2870659A1 (de) | 2015-05-13 |
WO2014005693A1 (de) | 2014-01-09 |
CN104428948A (zh) | 2015-03-18 |
EP2955788A1 (de) | 2015-12-16 |
EP2870660A1 (de) | 2015-05-13 |
ES2763866T3 (es) | 2020-06-01 |
US10211543B2 (en) | 2019-02-19 |
CN104428949B (zh) | 2017-05-24 |
US20150162668A1 (en) | 2015-06-11 |
CN104428948B (zh) | 2017-07-11 |
ES2856068T3 (es) | 2021-09-27 |
CN104428950B (zh) | 2017-04-12 |
WO2014005691A1 (de) | 2014-01-09 |
US20150188236A1 (en) | 2015-07-02 |
WO2014005699A1 (de) | 2014-01-09 |
US20150188238A1 (en) | 2015-07-02 |
EP2870660B1 (de) | 2021-01-06 |
US9660352B2 (en) | 2017-05-23 |
CN104428949A (zh) | 2015-03-18 |
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