EP1074061B1 - Zentral gespeistes antennensystem und verfahren zum optimieren eines solchen antennensystems - Google Patents
Zentral gespeistes antennensystem und verfahren zum optimieren eines solchen antennensystems Download PDFInfo
- Publication number
- EP1074061B1 EP1074061B1 EP99927692A EP99927692A EP1074061B1 EP 1074061 B1 EP1074061 B1 EP 1074061B1 EP 99927692 A EP99927692 A EP 99927692A EP 99927692 A EP99927692 A EP 99927692A EP 1074061 B1 EP1074061 B1 EP 1074061B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- reflector
- antenna system
- antenna
- copolar
- feed system
- 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.)
- Expired - Lifetime
Links
Images
Classifications
-
- 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
- H01Q19/02—Details
- H01Q19/021—Means for reducing undesirable effects
- H01Q19/023—Means for reducing undesirable effects for reducing the scattering of mounting structures, e.g. of the struts
-
- 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
- H01Q15/14—Reflecting surfaces; Equivalent structures
- H01Q15/141—Apparatus or processes specially adapted for manufacturing reflecting surfaces
-
- 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
- H01Q19/02—Details
- H01Q19/021—Means for reducing undesirable effects
-
- 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
- H01Q19/02—Details
- H01Q19/021—Means for reducing undesirable effects
- H01Q19/025—Means for reducing undesirable effects for optimizing the matching of the primary feed, e.g. vertex plates
-
- 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
- H01Q19/02—Details
- H01Q19/021—Means for reducing undesirable effects
- H01Q19/028—Means for reducing undesirable effects for reducing the cross polarisation
-
- 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
Definitions
- the invention relates to a centrally fed antenna system and a method for optimizing one Antenna system.
- Such antenna systems are usually systems with a single reflector and a feed system, however double reflector systems are also known, in which the Feeding system irradiated a subreflector, which in turn illuminates a main reflector.
- the following is always spoken of a single reflector antenna system; however are always available for a double reflector antenna system possible.
- centrally fed antenna systems structurally more compact with a single reflector.
- Regarding the electromagnetic properties has a centrally fed antenna no offset cross polarization and thereby produces less cross polarization than an antenna system with a single reflector and an offset feed system.
- centrally powered antennas have two significant disadvantages with regard to electromagnetic Properties: On the one hand, that emanating from the reflector electromagnetic field through the feed system that Supports for the feed system and the feed cables shaded, on the other hand, this electromagnetic field acts the feeding system back.
- the shading has essentially an influence on the copolar antenna pattern: it there is a ripple in this diagram in the main test, on the other hand, this electromagnetic field acts the feeding system back.
- the shading has essentially an influence on the copolar antenna pattern: it there is a ripple in this diagram in the main beam direction and a change in the level of the sidelobes.
- the antenna also has a higher cross polarization occur.
- the effect on the food system due to the near field emitted by the reflector has essentially an influence on the cross-polar antenna pattern and the reflection factor of the overall system.
- the shading can be reduced by using the Parts of the antenna system located near the field, i.e. the supports and the feed system as well as the cables, so transparent be designed as possible for the electromagnetic field; electrically conductive cladding is also possible, the additional scatter in the near field avoid and thus reduce the interference in the far field.
- the near field can affect the feed system can be reduced by interfering or scattering bodies, e.g. small cone-shaped diffuser in the center of the reflector be used.
- the scattering bodies are shaped so that the stray field and the The reflector reflected the near field in the area of the feed system overlay destructively, so here is a zero is produced. Nevertheless, this stray field is of course annoying also the far field.
- the invention is based on the object of a centrally fed antenna system to modify so that the effects of shadowing and the Effects on the feed system can be significantly reduced; also should specify a process by which this can be achieved.
- the actual shape of the effective surface of the reflector system is determined in a computer with the help of a software program.
- First the surface shape of the reflector is based on a program calculated based on the requirements for the copolar far field, whereby initially the effects of the reaction between the reflector surface and the feed system be ignored.
- a program is known and will be commonly referred to as a PO program, i.e. Physical optics; see. about “Stig Busk Sorensen: Manual for POS, Physical Optics Single reflector shaping program. TICRA engineering consultants, Copenhagen, Denmark, June 1995 ". This gives you a calculation model of one to the requirements regarding the copolar far field adapted antenna system.
- This calculation model is then based on an optimization program, which is effective on essentially the whole Reflector surface is used, optimized to that the repercussions of the near field on the food system essentially brought to zero without that through this optimization the properties of the copolar Far field are changed significantly.
- a centrally fed antenna system 1 is shown in FIG a single reflector 2 and a feed system, in this Trap a horn 3 shown, the horn over four Supports 4 is held centrally above the reflector 2 and over Cable 5 is fed.
- the reflector 2 is a parabolic reflector, which according to conventional Methods is designed to provide a desired coverage area 6 ( Figure 4) is sufficiently illuminated.
- the antenna system 1 is e.g. on a communications satellite used so that the coverage area is a certain Area on the earth's surface.
- the supports 4 as struts with a honeycomb structure made of fiber-reinforced plastic manufactured.
- Aramid fibers are preferably used as fibers.
- the horn 3 is covered with a reflective film, e.g. an aluminum foil, roughly wrapped, which in particular serves to reflect the near field on sharp edges etc. to prevent.
- the surface of the parabolic reflector is first of all with the help of a software program calculated so that the far field the desired coverage area of the antenna system 6 covered. This is done e.g. with the help of the above PO program.
- the deviations calculated therewith are the optimized ones Reflector surface opposite the preformed reflector surface shown.
- the data apply to an antenna reflector with a diameter of 100 cm and a Distance of the horn aperture above the center of the parabolic reflector of 40 cm.
- the frequency band lies with this antenna between 5.8 and 6.4 GHz with double linear polarization.
- the deviations of the optimized shown in Figure 2 Reflector 2 from the preformed parabolic shape are between -1.74 mm and +4.41 mm.
- the reflection factor of the overall system is in Reference to the reference system with a preformed parabolic reflector shown in the frequency band between 5.6 and 6.5 GHz.
- the curve for the reference system shown in copolarization With 7 here is the curve for the reference system shown in copolarization; with 8 is the corresponding curve for the optimized antenna system according to FIGS. 1 and 2 shown. You can see that the values here are significantly better are.
- the curve for the cross polarization is still shown for the antenna system according to the invention.
- the mean amplitude for the overall system is at about 22 dB.
- FIG. 4 there are antenna diagrams in each case over the coverage area 6 for the reference system with parabolic reflector and for the antenna system according to the invention:
- Figures 4a and 4b show the copolar antenna patterns for the reference system or the system according to the invention, the lines are given the respective dB values are.
- 4a is clear for the reference system an area approximately in the middle of the covering surface 6 10, which is delimited by a line with 24 dB is.
- Such an area is in FIG. 4b in the antenna system not available according to the invention.
- the entire Covering system in the antenna system according to the invention is almost bounded by a range with a dB value of 24.
- optimizing the overall Surface of the antenna reflector according to the invention that copolar far field can be better designed.
- the through the Attenuation caused by the horn, the struts and the cables Disorders of the copolar field are resolved with the An tennis system according to the invention greatly reduced.
- FIG 4c is the antenna diagram of the reference system shown in the cross polarization
- Figure 4d that of Antenna system according to the invention.
- a significant improvement the antenna properties can be achieved, i.e. that by optimizing essentially the entire reflector surface the influences of the retroactive effect of the near field the feeding system can be reduced.
- the overall system is improved so that the disturbing influences due to damping and feedback act on the feeding system like an equivalent one Interferers of more than - 30 dB.
- the values are in the table at the end of the description for the maximum total reflection factor, the minimum gain at the edge of the illuminated cover area, the minimum Gain within the coverage area in the frequency band between 5.854 and 6.298 GHz, the maximum Cross polarization over the entire coverage area and the minimal cross polarization discrimination XPD, i.e. a Point-by-point correlation between co and cross polarization on the entire illuminated area also listed in the frequency band between 5.854 and 6.298, once for a reference parabolic antenna, then for a parabolic antenna with a central one Disruptive body and finally for an antenna system whose Reflector according to the invention over the entire surface was reshaped.
- the antenna properties in cross polarization, due to the retroactive effect of the near field the feeding system can be created with a postforming of the entire reflector surface can be designed better than with the use of disruptive bodies.
- the antenna properties in copolarization on the edge of the covering area are in a reflector surface optimized according to the invention better than when using interfering bodies.
- the disruptive body disrupt the entire field that originally was designed under copolar requirements.
- antenna systems with double reflectors i.e. according to a sub-reflector and a main reflector optimize the invention.
- the sub-reflector irradiated over the entire system Surface optimized to affect the feed system to minimize and optimally illuminate the main reflector.
- the main reflector becomes like this again optimizes that the maximum of copolarization on the coverage area maximum and the effect on the subreflector is minimal.
- the optimization agrees very well with the analysis, ie the measured properties of the antenna system agree very well with the previously calculated properties.
- the method thus provides a very effective tool for constructing antenna systems without complicated and lengthy tests.
- Y Measurement maximum total reflection factor between 5,850 and 6,425 GHz -15.0 dB -22.0 dB -21.2 dB -23.9 dB Measurement : minimal gain at the edge of the footprint between 5,854 and 6,298 GHz (without cable losses) 23.11 dBi 23.69 dBi 22.95 dBi 23.10 dBi 23.86 dBi 23.73 dBi Measurement : minimum gain within the footprint between 5,854 and 6,298 GHz (without cable losses) 23.17 dBi 23.58 dBi 23.00 dBi 23.09 dBi 23.96 dBi 23.85 dBi Measurement : maximum cross polarization over the entire illumination area between 5,854 and 6,298 GHz (without cable losses) +3.64 dBi +4.76 dBi -1.11 dBi -0.29 dBi -4.37 dBi -5.32 dBi Measurement
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- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Aerials With Secondary Devices (AREA)
Description
- Figur 1
- eine schematische perspektivische Ansicht einer zentral gespeisten Antenne mit einem Horn als Speisesystem und einem Einfachreflektor, dessen Oberfläche gemäß der Erfindung geformt ist;
- Figur 2
- eine schematische perspektivische Darstellung der Abweichung der Oberflächengestalt des gemäß der Erfindung geformten Reflektors von einem üblichen Parabolreflektor;
- Figur 3
- eine Darstellung des Reflexionsfaktors des Gesamtsystemes für ein Referenzsystem mit einem Parabolreflektor für die Polarisation in X-Richtung und für ein Antennensystem gemäß der Erfindung für die Polarisationen in X- und Y-Richtung;
- Fig. 4a bis 4d
- Gegenüberstellungen der Antennendiagramme in Elevation und Azimut über der Bedeckungsflähe in Co- und Kreuzpolarisation für ein Referenzsystem und ein Antennensystem gemäß der Erfindung.
ursprüngliche Reflektoroberfläche ohne Streukörper | ursprüngliche Reflektoroberfläche mit ⊘90mm Platte Pos. 356.4 | nachgeformte Reflektoroberfläche | ||||
Pol. X | Pol. Y | Pol. X | Pol. Y | Pol. X | Pol. Y | |
Messung: maximaler Gesamtreflexionsfaktor zwischen 5.850 und 6.425 GHz | -15.0 dB | -22.0 dB | -21.2 dB | -23.9 dB | ||
Messung: minimaler Gewinn am Rand vom Ausleuchtgebiet zwischen 5.854 und 6.298 GHz (ohne Kabel Verluste) | 23.11 dBi | 23.69 dBi | 22.95 dBi | 23.10 dBi | 23.86 dBi | 23.73 dBi |
Messung: minimaler Gewinn innerhalb vom Ausleuchtgebiet zwischen 5.854 und 6.298 GHz (ohne Kabel Verluste) | 23.17 dBi | 23.58 dBi | 23.00 dBi | 23.09 dBi | 23.96 dBi | 23.85 dBi |
Messung: maximaler Kreuzpolarisation auf dem gesamten Ausleuchtgebiet zwischen 5.854 und 6.298 GHz (ohne Kabel Verluste) | +3.64 dBi | +4.76 dBi | -1.11 dBi | -0.29 dBi | -4.37 dBi | -5.32 dBi |
Messung: minimale XPD auf dem gesamten Ausleuchtgebiet zwischen 5.854 und 6.298 GHz (ohne Kabel Verluste) | 21.87 dB | 19.90 dB | 26.06 dB | 24.80 dB | 29.44 dB | 29.82 dB |
Claims (7)
- Zentral gespeistes Antennensystem mit einem Speisesystem und einem, eine Bedeckungsfläche beleuchtenden Reflektorsystem, das mindestens einen Parabolreflektor mit einer strukturierten Oberfläche aufweist, dadurch gekennzeichnet, dass die Oberfläche des Parabolreflektors (2) in radialer Richtung Erhebungen und Senken aufweist, denen zumindest teilweise in Umfangsrichtung weitere Erhebungen und Senken überlagert sind und im wesentlichen die gesamte Struktur der Reflektoroberfläche mit den Erhebungen und Senken so ausgelegt ist, dass das Maximum des copolaren Femfeldes auf der Bedeckungsfläche (6) liegt und das Minimum des copolaren Nahfeldes an dem Speisesystem (3) liegt.
- Antennensystem nach Anspruch 1, dadurch gekennzeichnet, daß die Reflektoroberfläche dergestalt geformt ist, daß bei der Optimierung des Nahfeldes zur Reduzierung der Rückwirkung auf das Speisesystem das copolare Fernfeld im wesentlichen nicht verändert wird.
- Antennensystem nach Anspruch 1 oder2, dadurch gekennzeichnet, daß das Speisesystem (3) einen geringen Aperturdurchmesser aufweist.
- Antennensysten nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß das Speisesystem (3) mit Stützen (4) abgestützt ist, die eine Wabenstruktur aus faserverstärktem Kunststoff haben.
- Antennensystem nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass das Reflektorssystem einen Hauptreflektor und einen Subreflektor aufweist, wobei sowohl die Oberfläche des Hauptreflektors als auch des Subreflektors Erhebungen und Senken aufweist.
- Verfahren zum Optimieren eines zentral gespeisten Antennensystems mit einem Speisesystem und einem, eine Bedeckungsfläche beleuchtenden Reflektorsystem mit mindestens einem Reflektor,
gekennzeichnet durch folgende Schritte:Festlegung einer parabolförmigen Oberfläche für mindestens einen Reflektor,Errechnung des Fernfeldes des Antennensystems mit Hilfe eines ersten Rechenprogramms,Verformung im wesentlichen der gesamten Reflektoroberfläche mit Hilfe eines zweiten Rechenprogramms unter Bildung von Erhebungen und Senken in radialer Richtung und zumindest teilweise in Umfangsrichtung derart, dass im Bereich des Speisesystems ein Minimum des copolaren Nahfeldes erzeugt wird und das Maximum des copolaren Fernfeldes auf der Bedeckungsfläche liegt. - Verfahren nach Anspruch 6, dadurch gekennzeichnet, dass zunächst eine Optimierung einer Subreflektor-Oberfläche und anschließend eine Optimierung einer Hauptreflektor-Oberfläche des Reflektorsystems erfolgt.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19817766A DE19817766A1 (de) | 1998-04-21 | 1998-04-21 | Zentral gespeistes Antennensystem und Verfahren zum Optimieren eines solchen Antennensystems |
DE19817766 | 1998-04-21 | ||
PCT/DE1999/001188 WO1999054955A2 (de) | 1998-04-21 | 1999-04-20 | Zentral gespeistes antennensystem und verfahren zum optimieren eines solchen antennensystems |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1074061A2 EP1074061A2 (de) | 2001-02-07 |
EP1074061B1 true EP1074061B1 (de) | 2002-12-11 |
Family
ID=7865303
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99927692A Expired - Lifetime EP1074061B1 (de) | 1998-04-21 | 1999-04-20 | Zentral gespeistes antennensystem und verfahren zum optimieren eines solchen antennensystems |
Country Status (8)
Country | Link |
---|---|
US (1) | US6489929B1 (de) |
EP (1) | EP1074061B1 (de) |
JP (1) | JP2002512462A (de) |
CN (1) | CN1292939A (de) |
CA (1) | CA2329739C (de) |
DE (2) | DE19817766A1 (de) |
DK (1) | DK1074061T3 (de) |
WO (1) | WO1999054955A2 (de) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4001014B2 (ja) * | 2002-12-25 | 2007-10-31 | 日本電気株式会社 | 携帯電話機 |
JP4468300B2 (ja) | 2003-08-13 | 2010-05-26 | 三菱電機株式会社 | 反射鏡アンテナ装置 |
JP4673067B2 (ja) * | 2005-01-18 | 2011-04-20 | 株式会社デバイス | アンテナ昇降装置 |
EP2161784A1 (de) * | 2008-09-05 | 2010-03-10 | Astrium Limited | Antennenreflektor |
US9190716B2 (en) * | 2008-09-05 | 2015-11-17 | Astrium Limited | Reflector |
US10516216B2 (en) | 2018-01-12 | 2019-12-24 | Eagle Technology, Llc | Deployable reflector antenna system |
US10707552B2 (en) | 2018-08-21 | 2020-07-07 | Eagle Technology, Llc | Folded rib truss structure for reflector antenna with zero over stretch |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS564903A (en) | 1979-06-26 | 1981-01-19 | Nippon Telegr & Teleph Corp <Ntt> | Opening surface antenna with improved cross polarization characteristic |
-
1998
- 1998-04-21 DE DE19817766A patent/DE19817766A1/de not_active Withdrawn
-
1999
- 1999-04-20 JP JP2000545212A patent/JP2002512462A/ja not_active Withdrawn
- 1999-04-20 DE DE59903754T patent/DE59903754D1/de not_active Expired - Lifetime
- 1999-04-20 CN CN99803942XA patent/CN1292939A/zh active Pending
- 1999-04-20 CA CA002329739A patent/CA2329739C/en not_active Expired - Fee Related
- 1999-04-20 DK DK99927692T patent/DK1074061T3/da active
- 1999-04-20 US US09/673,838 patent/US6489929B1/en not_active Expired - Lifetime
- 1999-04-20 EP EP99927692A patent/EP1074061B1/de not_active Expired - Lifetime
- 1999-04-20 WO PCT/DE1999/001188 patent/WO1999054955A2/de active IP Right Grant
Also Published As
Publication number | Publication date |
---|---|
DE19817766A1 (de) | 1999-11-11 |
US6489929B1 (en) | 2002-12-03 |
WO1999054955A3 (de) | 1999-12-02 |
DE59903754D1 (de) | 2003-01-23 |
CN1292939A (zh) | 2001-04-25 |
JP2002512462A (ja) | 2002-04-23 |
EP1074061A2 (de) | 2001-02-07 |
CA2329739A1 (en) | 1999-10-28 |
DK1074061T3 (da) | 2003-01-06 |
CA2329739C (en) | 2004-02-24 |
WO1999054955A2 (de) | 1999-10-28 |
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