EP1204158A2 - Struktur-Antenne für Fluggeräte oder Flugzeuge - Google Patents
Struktur-Antenne für Fluggeräte oder Flugzeuge Download PDFInfo
- Publication number
- EP1204158A2 EP1204158A2 EP01125860A EP01125860A EP1204158A2 EP 1204158 A2 EP1204158 A2 EP 1204158A2 EP 01125860 A EP01125860 A EP 01125860A EP 01125860 A EP01125860 A EP 01125860A EP 1204158 A2 EP1204158 A2 EP 1204158A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- conductive
- folded edge
- structural antenna
- antenna
- structural
- 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.)
- Granted
Links
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/27—Adaptation for use in or on movable bodies
- H01Q1/28—Adaptation for use in or on aircraft, missiles, satellites, or balloons
- H01Q1/286—Adaptation for use in or on aircraft, missiles, satellites, or balloons substantially flush mounted with the skin of the craft
- H01Q1/287—Adaptation for use in or on aircraft, missiles, satellites, or balloons substantially flush mounted with the skin of the craft integrated in a wing or a stabiliser
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/30—Resonant antennas with feed to end of elongated active element, e.g. unipole
- H01Q9/40—Element having extended radiating surface
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/30—Resonant antennas with feed to end of elongated active element, e.g. unipole
- H01Q9/42—Resonant antennas with feed to end of elongated active element, e.g. unipole with folded element, the folded parts being spaced apart a small fraction of the operating wavelength
Definitions
- the invention relates to a structural antenna for aircraft or aircraft with approximately omnidirectional radiation pattern, which acts as a conductive element on a non-conductive Layer is arranged, which is the base layer of the surface of an aerodynamic Active area of the aircraft forms, the radiating element around a folded edge the aerodynamic effective area of the aircraft is arranged around.
- Antennas to be used on aircraft or airplanes are one Subject to a number of requirements.
- the contour of the aircraft or aircraft should if possible not be influenced so far that the aero-dynamic conditions and thus significantly change the flight characteristics.
- the arrangement and attachment the antenna must be in accordance with the mechanical structure of the structural parts and the mechanical strength of the structure must not be affected.
- the radar backscatter cross section should be changed only slightly if possible.
- antennas in aircraft or aircraft Since the installation location of antennas in aircraft or aircraft is very limited, the antennas in wings, tail units or in the corresponding rudder flaps are increasingly used built-in. The use of antennas in these very narrow buildings Elements is problematic because the radiation properties in the edge direction because of the small aperture are strongly restricted in this direction.
- US Pat. No. 5,191,351 describes a series of folded broadband antennas with symmetrical Radiation pattern.
- the proposed log-periodic Antennas are basically suitable for installation on wing edges and their antenna diagrams meet the desired requirements. Feeding the antennas takes place at the folded edge, which results in design-related restrictions.
- the leading edge of wings and tail surfaces consists of a sharp, continuous metal edge to strengthen the sharp edges to master that for the requirements of low radar detectability are necessary, and on the other hand adequate lightning protection of the antennas to ensure a low-resistance galvanic connection to the structure.
- the in the Antennas described above can not meet these requirements fulfill.
- an antenna suitable for aerodynamic active surfaces shows US 3,039,095.
- the active surface may have sharp edges. Since the Antenna elements are each arranged on the side surfaces of the aerodynamic active surface there are losses in the radiation in the direction of the edges.
- the object is achieved in that the structure antenna is flat Antenna is executed and integrated in the surface of the aerodynamic effective area is.
- the aerodynamic effective area in the area of the structural antenna consists of the dielectric material of a non-conductive layer.
- the conductive surface of the Structural antenna is wholly or at least partially from a non-conductive area Surround layer, which may preferably have the shape of a strip.
- the structure antenna is fed in the area of the conductive surface facing away from the folded edge, so that the current direction is perpendicular to the folded edge and the wave resistance is on the folded edge is very much lower than in the area of the ends of the structural antenna remote from the edge.
- the structure antenna according to the invention has one compared to the prior art Number of advantages.
- the feed is not at the folded edge, but removed from the edge in an area of the wing or tail unit in which due to the increasing Thickness of the structure facilitates the installation and connection of the structure antenna becomes.
- the possibility of a conductive connection between the structure antenna and the folding edge associated with the structure proves to be a significant advantage because of the Lightning protection and in the manufacture of aircraft, for strength reasons with a metallic sharp edge must be equipped.
- the sharp edge includes Favorable stealth properties, since the radar backscatter cross section deteriorates only slightly becomes.
- edges of the structural antenna consisting of metallic conductive surfaces at an angle to the main threat direction, which corresponds to the direction of flight and in that the gaps between the pattern antenna and the conductive
- the surface layer of the aerodynamic active area may be chosen to be very small.
- FIGS. 1a and 4a Structural antenna which is arranged on an aerodynamic active surface 3, explained.
- An aerodynamic active surface 3 in the form of an aerofoil, an empennage or a rudder flap belonging to an unmanned aerial vehicle or aircraft, has a sharp folded edge 4, around which the structure antenna 1 is arranged is.
- Ia shows a top view of only one half of the structural antenna 1 the other half is symmetrical to the folded edge 4 on the side of the not visible here aerodynamic active surface 3.
- FIG. 4a shows the section belonging to FIG. 1a through the structural antenna 1.
- the aerodynamic effective area points at least in the area of the Structural antenna 1 a base layer 6, 12 made of an electrically insulating material such as Plastic or ceramic.
- the conductive part of the structure antenna 1 consists of a conductive surface 9, 11 as for example by metallizing the surface of the non-conductive layer 6, 12 or in the form of a sheet metal part can be produced.
- conductive surface 9 is not the same as that along the active surface continuous folding edge 4 electrically connected. But it can, as in Fig. 1 b, 2b and 3b, with the folded edge 4 and thus also with the structure of the aircraft be connected conductively. If, as shown in Fig. Ia, 2a and 3a, of the folded edge 4 is insulated, the conductive surface 9 ends in the immediate vicinity of the folded edge 4.
- the feeding of the structural antenna 1 is different in FIGS.
- the structural antenna 1 is at least partially surrounded by a region of the non-conductive layer 6, 12, the conductive surface 9, 11 in the form of a strip in the exemplary embodiment surrounds.
- the structure antenna is outside the region of the non-conductive layer 6, 12 1 surrounded by a conductive surface 2, which is on the non-conductive layer 6, 12 rests
- the basic principle of the structural antenna used here is that a flat one Resonator with a side length of about 1/2 of the operating wavelength h on one non-conductive base material such as plastic or ceramic or arranged above an air space is.
- the radiation characteristic is assumed that the reference potential runs at an acute angle to the planar extent of the resonator.
- In the present Invention reduces the distance to this potential from the distant to Folded edge 4 lying ends of the structural antenna 1 up to the folded edge 4 itself.
- the wave resistance is large in the area of the ends and in the area of the folded edge 4 very small. This changes in inverse proportion to the wave resistance also the current distribution over the structure antenna.
- the current flow 5 in the area of Folded edge 4, d. H. the center of the folded structure antenna, is compared to the usual Prior art patch antennas larger. That is why there is also increasing the low radiation per se in the direction of the folded edge 4.
- an omnidirectional characteristic is achieved in an imaginary Approximately level that is transverse to the aerodynamic effective area in the direction of flight.
- an increase in the current density can be achieved in the area of the folded edge 4 in that the structure antenna 1 covered area proportional to its width B with increasing distance reduced from edge 4. Examples of this are shown in FIGS. 2a, 2b, 3a and 3b.
- the structure antenna 1 is one from the known microstrip patch antenna Derived design, shown schematically simplified in Fig. 1 a is. It is folded in its central area so that it is the edge of a wing, of a tail unit or a rudder. 2a, ..., 3b show different Designs of such structure antennas 1 in plan view. As with such structural antennas usual, different structure antenna surface shapes such as square, rectangular, triangular, diamond-shaped, circular, elliptical or similar to Come into play.
- the edges of the aircraft are often essentially Plastic wings, tail units or rudders with metal rails strengthened. For strength reasons, these metal rails must not be interrupted and also not be replaced by non-conductive plastic elements. So is a senior Connected to the rest of the metallized structure via this edge. Since the structure antenna 1 according to the invention in the area of the folded edge 4 a voltage zero has, is a conductive connection between the pattern antenna 1 and the metallic folding edge 4, as in the arrangements according to Figures 1 b, 2b, 3b, can be realized and also not disadvantageous. These embodiments are preferably used because they meet the requirements for the strength of the folded edge and for lightning protection fulfill. If the structure antenna 1 is grounded in the middle, it is groundless Infeed to avoid asymmetries through the formation of earth loops absolutely necessary.
- the metallic folded edge 4 is of the conductive type Surface of the wing isolated, as shown in Fig. 1a, 2a and 3a.
- the structure antenna is a metal surface that extends almost into the folded edge 4 14, which is connected to the jacket of the coaxial supply line 15 and thus that electrical reference potential to the conductive surface 11 forms.
- the non-conductive layer 12 close to the structure antenna with a conductive coating 16 can be provided, a strip of the non-conductive layer 12 being left free becomes.
- FIG. 4b shows a preferred design with a symmetrical feed using the known Lindenblad ⁇ / 4 locking pot 17.
- This type of Infeed is the grounding of the conductive surface of the structure antenna 11 at the folded edge 4 not critical.
- the feed takes place via the symmetrically arranged Feed points 13a and 13b, which are also in the area of the conductive surface 11 of the Structure antenna 1 are the furthest from the folded edge 4.
- the metallic Folding edge 4 is forcibly symmetrized via the h / 4 locking pot 17.
- the conductive Surface 11 of the structure antenna is grounded on the metallic folded edge 4 or compulsorily symmetrical, since the feed through the h / 4 blocking pot 17 is ungrounded.
- Fig. 4c can be on a metal surface 14, which in the embodiment 4b runs from the folded edge 4 to the locking pot 17, can also be dispensed with.
- the Power is then supplied directly from the supply line 15 via the locking pot 17 and the connections 13a and 13b, which are also in the area of the conductive surface 11 of the structure antenna 1, which is furthest from the folded edge 4.
- This makes it a special one Achieved manufacturing advantage because this metal surface 14 is difficult to wedge-shaped Wing structure is to be introduced.
- Due to the floating supply and grounding the folded edge 4 results in a good symmetry by itself, since in the area of imaginary line of symmetry (dash-dotted lines) within the structure a zero potential formed.
- the reduction in the wave resistance to the folded edge 4 results themselves in the same way as in the previous examples.
- 1b, 2b and 3b are variants of the designs already described shown, in which the conductive surface 9 at least with the metallic folded edge 4, which runs along the aerodynamic active surface 3, and also with the conductive surface 2 of the aerodynamic active area itself is connected. Should be the non-conductive Layer 12 around the structure antenna must not be metallized, so is at least the conductive one Given connection between the conductive surface 9 and the folded edge 4, the in turn has the same potential with the structure.
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Astronomy & Astrophysics (AREA)
- Aviation & Aerospace Engineering (AREA)
- General Physics & Mathematics (AREA)
- Remote Sensing (AREA)
- Details Of Aerials (AREA)
Abstract
Description
- Fig.1a
- eine Draufsicht auf eine rechteckförmige Strukturantenne, die an der Kante einer aerodynamischen Wirkfläche angeordnet ist,
- Fig. 1b
- eine Alternative zu Fig. 1a,
- Fig. 2a
- eine rautenförmige Strukturantenne,
- Fig. 2b
- eine Alternative zu Fig. 2a,
- Fig. 3a
- eine kreisförmige Strukturantenne,
- Fig. 3b
- eine Alternative zu Fig. 3a,
- Fig. 4a
- eine asymmetrische Speisung einer Strukturantenne,
- Fig. 4b
- eine Speisung mit Zwangssymmetrierung,
- Fig. 4c
- eine Speisung ohne Zwangssymmetrierung.
Claims (8)
- Strukturantenne (1) für Fluggeräte oder Flugzeuge mit annähernd rundstrahlender Abstrahlcharakteristik, die als leitfähiges Element auf einer nichtleitenden Schicht angeordnet ist, welche die Grundschicht der Oberfläche einer aerodynamischen Wirkfläche (3) des Fluggeräts bildet, wobei das strahlende Element um eine Faltkante (4) der aerodynamischen Wirkfläche des Fluggeräts herum angeordnet ist, dadurch gekennzeichnet,dass die Strukturantenne (1) in Form einer leitfähigen Fläche (9, 11) in der aerodynamischen Wirkfläche (3) integriert ist, wobei die Strukturantenne auf dem dielektrisch wirksamen Material der nichtleitenden Schicht (6, 12) angeordnet ist,dass die leitfähige Fläche (9, 11) teilweise oder ganz von einem Bereich der nichtleitenden Schicht (6,12) umgeben ist,dass die Strukturantenne (1) in dem der Faltkante (4) abgewandten Bereich der leitenden Fläche (9, 11) gespeist wird, so dass die Stromrichtung (5) senk-recht zur Faltkante (4) verläuft und der Wellenwiderstand an der Faltkante sehr viel niedriger ist als im Bereich der kantenfernen Enden der Strukturantenne (1).
- Strukturantenne nach Anspruch 1, dadurch gekennzeichnet, dass die Breite (B) der Strukturantenne (1) sich mit zunehmender Entfernung von der Faltkante (4) verringert.
- Strukturantenne nach Anspruch 2, dadurch gekennzeichnet, dass die Ränder (7) der leitfähigen Fläche (9, 11) vorzugsweise schräg zur Faltkante (4) angeordnet sind.
- Strukturantenne nach wenigstens einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die leitende Fläche (9, 11) an der Faltkante (4) mit einer sie umgebenden leitfähigen Oberfläche (2) leitend (8) verbunden ist.
- Strukturantenne nach wenigstens einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die leitfähige Fläche (9, 11) gegenüber einer sie umgebenden leitfähigen Oberfläche (2, 16) die auf der nichtleitenden Schicht (6,12) angeordnet ist, isoliert ist.
- Strukturantenne nach Anspruch 4, dadurch gekennzeichnet, dass die Speisung der Strukturantenne (1) über eine symmetrische erdfreie Zuleitung (15) unter Verwendung eines λ/4-Sperttopfes (17) erfolgt.
- Strukturantenne nach Anspruch 6, dadurch gekennzeichnet, dass eine Metallfläche (14), die innerhalb der Strukturantenne (1) mittig zu den leitenden Flächen (11) angeordnet ist, mit dem Außenleiter des λ/4-Sperrtopfes (17) und der Faltkante (4) verbunden ist.
- Strukturantenne nach Anspruch 6, dadurch gekennzeichnet, dass die leitenden Flächen (11) der Strukturantenne symmetrisch über die potentialführenden Anschlüsse (13a) und (13b) der symmetrischen erdfreien Zuleitung (15) gespeist werden.
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10054332 | 2000-11-02 | ||
DE10054332 | 2000-11-02 | ||
DE10151288 | 2001-10-22 | ||
DE10151288A DE10151288B4 (de) | 2000-11-02 | 2001-10-22 | Struktur-antenne für Fluggeräte oder Flugzeuge |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1204158A2 true EP1204158A2 (de) | 2002-05-08 |
EP1204158A3 EP1204158A3 (de) | 2003-12-10 |
EP1204158B1 EP1204158B1 (de) | 2006-08-30 |
Family
ID=26007550
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20010125860 Expired - Lifetime EP1204158B1 (de) | 2000-11-02 | 2001-10-30 | Struktur-Antenne für Fluggeräte oder Flugzeuge |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP1204158B1 (de) |
DE (1) | DE50110862D1 (de) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2614219A (en) * | 1947-09-30 | 1952-10-14 | Cary Rex Henry John | Aerial system |
DE2212647A1 (de) * | 1972-03-16 | 1973-09-20 | Messerschmitt Boelkow Blohm | Nutantenne |
US5191351A (en) * | 1989-12-29 | 1993-03-02 | Texas Instruments Incorporated | Folded broadband antenna with a symmetrical pattern |
EP0996191A2 (de) * | 1998-10-23 | 2000-04-26 | TRW Inc. | Ebenes, selbsttragendes Antennensystem zur Anregung der Flugzeugstruktur |
-
2001
- 2001-10-30 DE DE50110862T patent/DE50110862D1/de not_active Expired - Lifetime
- 2001-10-30 EP EP20010125860 patent/EP1204158B1/de not_active Expired - Lifetime
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2614219A (en) * | 1947-09-30 | 1952-10-14 | Cary Rex Henry John | Aerial system |
DE2212647A1 (de) * | 1972-03-16 | 1973-09-20 | Messerschmitt Boelkow Blohm | Nutantenne |
US5191351A (en) * | 1989-12-29 | 1993-03-02 | Texas Instruments Incorporated | Folded broadband antenna with a symmetrical pattern |
EP0996191A2 (de) * | 1998-10-23 | 2000-04-26 | TRW Inc. | Ebenes, selbsttragendes Antennensystem zur Anregung der Flugzeugstruktur |
Also Published As
Publication number | Publication date |
---|---|
DE50110862D1 (de) | 2006-10-12 |
EP1204158B1 (de) | 2006-08-30 |
EP1204158A3 (de) | 2003-12-10 |
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