EP1619751A1 - Wideband antenna of low profile - Google Patents
Wideband antenna of low profile Download PDFInfo
- Publication number
- EP1619751A1 EP1619751A1 EP05012307A EP05012307A EP1619751A1 EP 1619751 A1 EP1619751 A1 EP 1619751A1 EP 05012307 A EP05012307 A EP 05012307A EP 05012307 A EP05012307 A EP 05012307A EP 1619751 A1 EP1619751 A1 EP 1619751A1
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- Prior art keywords
- base
- antenna
- radiating surface
- antenna according
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- 230000006978 adaptation Effects 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 4
- 239000004020 conductor Substances 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 230000005855 radiation Effects 0.000 description 4
- 238000003491 array Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 239000003989 dielectric material Substances 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000012811 non-conductive material Substances 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
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Classifications
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- 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
- H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
- H01Q9/0442—Substantially flat resonant element parallel to ground plane, e.g. patch antenna with particular tuning means
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- 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
- H01Q13/08—Radiating ends of two-conductor microwave transmission lines, e.g. of coaxial lines, of microstrip lines
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- 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
- H01Q9/16—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole
- H01Q9/28—Conical, cylindrical, cage, strip, gauze, or like elements having an extended radiating surface; Elements comprising two conical surfaces having collinear axes and adjacent apices and fed by two-conductor transmission lines
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- 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
Definitions
- the invention relates to an antenna comprising a radiating surface and a base surface.
- Stripe antennas also referred to as patch antennas, are characterized by a low weight and a small cross section, which gives you an easy handling and a wide field of application.
- Known strip antennas consist of a metal strip, which is arranged at a predeterminable distance parallel to a metallic base. Between the strip and the base is usually a homogeneous dielectric. The length of the metal strip is selected so that the electrical length of the line forming the strip with the base is about half a wavelength (in dielectric) long. The width of the metal surface essentially determines the impedance of the antenna, the distance of the strip to the base essentially determines the bandwidth. This distance is at the same time the height of the strip antenna. Typically, the height is between one-twentieth and one-fifth of the free space wavelength at mid-band, with a larger height has a higher bandwidth result.
- a disadvantage of the strip antennas is the low bandwidth.
- the shape of the metal strip is chosen such that the resonance frequencies of two or more oscillation modes of the antenna have a relatively small frequency spacing.
- bandwidth ratios of up to 1.6: 1 can be achieved.
- the bandwidth ratio is defined as the ratio of the upper Frequency limit to the lower frequency limit.
- Such strip antennas are known, for example, from EP 0 989 628 B1 and WO 2004/021514 A1.
- the base area is connected to the emission surface by means of a coaxial cable, the coaxial cable serving to supply signals to the emission surface.
- the base surface in this case has a vertical edge, which extends perpendicularly from the base surface, so that an "L" or "U” -shaped cross-section results.
- a disadvantage of this arrangement is that for certain applications too low bandwidth.
- one or more discrete components are arranged between the emission surface and the base surface, wherein the emission surface has a tapering with respect to its width B and with respect to its height H to the base surface.
- taper here means that along the longitudinal extent L of the emission surface, the width B and the height H of the emission surface vary over the base surface.
- the emission surface advantageously has a maximum length L max ⁇ 0.6 ⁇ max , a maximum width B max ⁇ ⁇ max and a maximum height H max ⁇ 0.4 ⁇ max with respect to the base area, where ⁇ max is the free space wavelength at the lower frequency limit f u is the frequency band of the antenna.
- ⁇ max is the free space wavelength at the lower frequency limit f u is the frequency band of the antenna.
- VSWR VSWR in a frequency range [f u , f o ] with f u and f o as the lower and upper frequency limit of the frequency band of the antenna is preferably VSWR ⁇ 3, where for the bandwidth f o / f u ⁇ 1.4 applies.
- the radiating surface advantageously has a constant tapering.
- the radiating surface has the shape of an isosceles triangle.
- the radiating surface together with the base area forms a TEM waveguide with constant characteristic impedance.
- the means for feeding electromagnetic energy to the antenna are preferably arranged in the region of the smallest distance between radiating surface and base surface. In the case of a triangular radiating surface, this may expediently be a corner of the radiating surface.
- the feed is preferably a coaxial feed.
- the coaxial inner conductor is galvanically connected to the radiating surface, while the outer conductor is galvanically connected to the base of the antenna.
- the taping of the width of the radiating surface and the height of the radiating surface above the base is suitably chosen to match the impedance of the connected feeder cable, since then the resulting at the feed point higher vibration modes of the antenna are excited only with low amplitude.
- the discrete components which are distributed below the radiating surface in predeterminable locations with predeterminable values, serve to improve the adaptation for the lower part of the frequency range. Values and locations can be selected according to the respective requirements for the adaptation and to the radiation pattern of the antenna.
- the discrete components may in particular be inductors and / or capacitors.
- discrete component is to be understood functionally.
- an embodiment of a printed on a substrate (not shown) line can be used.
- the antenna according to the invention enables a very broadband radio method, e.g. Hopping operation.
- a simultaneous feeding of the antenna with multiple transmission lines, which are distributed in a wide frequency range possible.
- the antenna according to the invention it is possible to simultaneously receive a plurality of received signals lying in a wide frequency band.
- Another advantage of the antenna according to the invention is the ability to use this broadband antenna directly in front of a metallic or non-metallic wall without degrading its adaptation or radiation pattern. This is also possible with conformal adaptation of the radiating surface to a possibly curved shape of the metallic wall.
- the wall itself can be used as a base.
- the wall could e.g. be a part of the surface of a vehicle, a ship or an airplane. Due to the low height of the antenna, the antenna towers only slightly above the vehicle surface. This applies to versions for the VHF, the UHF and of course for the microwave range.
- the antenna element in a structure in a first preferred embodiment according to FIGS. 1 to 3 comprises a radiating surface 1 and a metallic base 2.
- the signal connection 7 by means of a coaxial cable can be effected by means of a person skilled in the known measures, wherein the inner conductor of the coaxial cable with the radiating surface 1 and the outer conductor of the coaxial cable to the base 2 is conductively connected.
- the antenna element in a housing may be housed.
- the region 5 of the signal terminal 7 may preferably means, such as pins (not shown) may be present, which allow a secure holding the radiating surface 1 in a fixed, separated from the base 2 position.
- pins are suitably made of electrically non-conductive material, such as plastic.
- B the filling of the space area between the base 2 and the radiating surface 1 with dielectric material matching dielectric constant.
- the parts of the radiating surface 1 in the region 4 of the discrete components 3 and / or in the region 5 of the signal terminal (not shown) are executed parallel to the base 2. This allows the handling of the radiating surface 1 and in particular improve the attachment of the discrete components 3 and the signal terminal to the radiating surface 1.
- the radiating surface 1 has by way of example a distance value H max of 0.13 * ⁇ max to the base 2, where ⁇ max is the free space wavelength at the lower frequency limit f u of the frequency band of the antenna.
- the distance H max is suitably determined as solder on the base 2.
- the size L max is, for example, 0.25 * ⁇ max
- the size B max is also 0.25 * ⁇ max by way of example.
- the location and value of the discrete components are selected as a function of H max , L max and B max .
- the distance H max between the radiating surface 1 and the base 2 in the region 4 of the discrete components 3 can be changed for reasons of improved adaptation.
- the radiating surface 1 has a slot 11 which is perpendicular to its longitudinal extension L.
- the radiating surface 1 is split into a rear part HT and a front part VT.
- this slot 11 is formed by discrete dummy elements (not shown), e.g. Inductors bridged.
- Inductors e.g. Inductors bridged.
- discrete dummy element is to be understood functionally.
- an embodiment of a printed on a substrate (not shown) line can be used.
- the base 2 can advantageously be flat, single curved or double curved and the radiating surface 1 can be made to conform to the curvature of the base 2. This makes it possible to attach the antenna assembly also on any desired carrier structures with low space requirements.
- FIG. 5 shows the curve of the standing wave ratio VSWR at the feed point of the signal terminal of the embodiment shown in FIG. 4 as a function of the frequency.
- the underlying standing wave ratio is calculated based on the dispersion of the voltage measured at the input of the terminal of the feeding means at the radiating surface 1.
- VSWR is less than 2 in the frequency range 220-450 MHz. In the entire frequency band of 200-1050 MHz, the VSWR is less than 3.
- Fig. 6 shows a third embodiment of an antenna according to the invention.
- the base surface is replaced by a second radiating surface 1a, wherein the second radiating surface 1a is mirrored on the plane defined by the base plane (not shown).
- the parts of the radiating surface 1, 1 a in the region 4 of the discrete components 3 and / or in the region 5 of the terminal 7 are executed parallel to the base.
- the radiating surfaces 1, 1 a have a shape shown in FIGS. 1 and 2.
- FIG. 7 shows an exemplary embodiment of an application of an antenna according to the invention.
- Several antennas 9 are arranged on the circumference of a cylinder 8.
- the shape of the cylinder 8 can be useful similar to a ship's mast.
- the antennas 9 are placed on the outer surface of the cylinder 8 and are used as transmitting antennas for different frequency ranges. Possible transmission or reception ranges are e.g. 30-100 MHz, 100-200 MHz and 200-600 MHz.
- the cylinder arrays are used in the transmission case for communication and electronic countermeasures to disturb opposing communication devices.
- the arrays for communication and for electronic support measures i. Conception, bearing and classification of foreign communication devices used.
- the antennas 9 are distributed via so-called beamforming networks 10 (beamforming) both in sum diagrams and in individual radiator diagrams to the terminals, ie transmitters and receivers.
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Abstract
Description
Die Erfindung betrifft eine Antenne umfassend eine Abstrahlfläche und eine Grundfläche.The invention relates to an antenna comprising a radiating surface and a base surface.
Streifenantennen, auch als Patch-Antennen bezeichnet, zeichnen sich durch ein geringes Gewicht und einen geringen Querschnitt aus, was Ihnen eine leichte Handhabung und ein breites Anwendungsfeld verschafft.Stripe antennas, also referred to as patch antennas, are characterized by a low weight and a small cross section, which gives you an easy handling and a wide field of application.
Bekannte Streifenantennen bestehen aus einem Metallstreifen, der in einem vorgebbaren Abstand parallel zu einer metallischen Grundfläche angeordnet ist. Zwischen dem Streifen und der Grundfläche befindet sich meist ein homogenes Dielektrikum. Die Länge des Metallstreifens ist so gewählt, dass die elektrische Länge der Leitung, die der Streifen mit der Grundfläche bildet, ungefähr eine halbe Wellenlänge (im Dielektrikum) lang ist. Die Breite der Metallfläche bestimmt im Wesentlichen die Impedanz der Antenne, der Abstand des Streifens zur Grundfläche bestimmt im Wesentlichen die Bandbreite. Dieser Abstand ist gleichzeitig die Bauhöhe der Streifenantenne. Üblicherweise liegt die Bauhöhe zwischen einem Zwanzigstel und einem Fünftel der Freiraumwellenlänge bei Bandmitte, wobei eine größere Bauhöhe eine höhere Bandbreite zur Folge hat.Known strip antennas consist of a metal strip, which is arranged at a predeterminable distance parallel to a metallic base. Between the strip and the base is usually a homogeneous dielectric. The length of the metal strip is selected so that the electrical length of the line forming the strip with the base is about half a wavelength (in dielectric) long. The width of the metal surface essentially determines the impedance of the antenna, the distance of the strip to the base essentially determines the bandwidth. This distance is at the same time the height of the strip antenna. Typically, the height is between one-twentieth and one-fifth of the free space wavelength at mid-band, with a larger height has a higher bandwidth result.
Ein Nachteil der Streifenantennen ist die geringe Bandbreite. Zur Vergrößerung der Bandbreite wird z.B. die Form des Metallstreifens derart gewählt, dass die Resonanzfrequenzen von zwei oder mehr Schwingungsmoden der Antenne einen relativ geringen Frequenzabstand besitzen. Dadurch lassen sich Bandbreiteverhältnisse von bis zu 1,6:1 erreichen. Das Bandbreiteverhältnis ist definiert als das Verhältnis der oberen Frequenzgrenze zur unteren Frequenzgrenze. Solche Streifenantennen sind z.B. aus EP 0 989 628 B1 und WO 2004/021514 A1 bekannt.
Bei der Streifenantenne aus EP 0 989 628 B1 ist die Grundfläche dabei mittels eines Koaxialkabels mit der Abstrahlfläche verbunden, wobei das Koaxialkabel der Zuführung von Signalen an die Abstrahlfläche dient. Die Grundfläche weist in diesem Fall einen senkrechten Rand auf, welcher sich senkrecht von der Grundfläche erstreckt, so dass sich ein "L"- oder "U"-förmiger Querschnitt ergibt. Ein Nachteil dieser Anordnung ist die für bestimme Anwendungsgebiete zu geringe Bandbreite.A disadvantage of the strip antennas is the low bandwidth. To increase the bandwidth, for example, the shape of the metal strip is chosen such that the resonance frequencies of two or more oscillation modes of the antenna have a relatively small frequency spacing. As a result, bandwidth ratios of up to 1.6: 1 can be achieved. The bandwidth ratio is defined as the ratio of the upper Frequency limit to the lower frequency limit. Such strip antennas are known, for example, from EP 0 989 628 B1 and WO 2004/021514 A1.
In the case of the strip antenna from EP 0 989 628 B1, the base area is connected to the emission surface by means of a coaxial cable, the coaxial cable serving to supply signals to the emission surface. The base surface in this case has a vertical edge, which extends perpendicularly from the base surface, so that an "L" or "U" -shaped cross-section results. A disadvantage of this arrangement is that for certain applications too low bandwidth.
Für bestimmte kommerzielle und militärische Anwendungsgebiete, z.B. dem Hopping Betrieb bei militärischen Kommunikationsdiensten, bei Kampffeldüberwachungssystemen, bei Sendesystemen, bei denen mehrere Sender, die auf verschiedenen Frequenzen arbeiten, gleichzeitig an die gleiche Antenne angeschlossen sind sowie bei entsprechenden Empfangssystemen benötigt man Antennen, die zwar die geringe Bauhöhe und Baugröße aber eine beträchtlich größere Bandbreite besitzen, als sie sich mit Streifenantennen erzielen lassen. Es gibt natürlich andere Antennentypen, die das geforderte Bandbreiteverhältnis besitzen. Diese besitzen jedoch in vielen Fällen wesentlich größere Abmessungen.For certain commercial and military applications, e.g. The hopping operation in military communications services, combat field monitoring systems, transmission systems in which several transmitters operating at different frequencies are simultaneously connected to the same antenna and in receiving systems requires antennas, although the low height and size but a considerably larger Have bandwidth than they can be achieved with striped antennas. Of course, there are other types of antennas that have the required bandwidth ratio. However, these have much larger dimensions in many cases.
Es ist somit Aufgabe der Erfindung eine verbesserte Antenne anzugeben, mit welcher die Bandbreite wesentlich erhöht werden kann.It is therefore an object of the invention to provide an improved antenna, with which the bandwidth can be substantially increased.
Diese Aufgabe wird mit der Antenne gemäß Patentanspruch 1 gelöst. Vorteilhafte Ausführungen der Antenne sind Gegenstand von Unteransprüchen.This object is achieved with the antenna according to
Bei der erfindungsgemäßen Antenne sind zwischen der Abstrahlfläche und der Grundfläche ein oder mehrere diskrete Bauelemente angeordnet, wobei die Abstrahlfläche bezüglich ihrer Breite B und bezüglich ihrer Höhe H zur Grundfläche eine Taperung aufweist. Mit dem Begriff Taperung ist hierbei gemeint, dass entlang der Längsausdehnung L der Abstrahlfläche die Breite B sowie die Höhe H der Abstrahlfläche über der Grundfläche variieren.In the antenna according to the invention, one or more discrete components are arranged between the emission surface and the base surface, wherein the emission surface has a tapering with respect to its width B and with respect to its height H to the base surface. The term taper here means that along the longitudinal extent L of the emission surface, the width B and the height H of the emission surface vary over the base surface.
Die Abstrahlfläche weist vorteilhaft eine maximale Länge Lmax ≤ 0,6 λmax, eine maximale Breite Bmax ≤ λmax und eine bezüglich der Grundfläche maximale Höhe Hmax ≤ 0,4 λmax auf, wobei λmax die Freiraumwellenlänge an der unteren Frequenzgrenze fu des Frequenzbandes der Antenne ist. Für das Stehwellenverhältnis VSWR gilt in einem Frequenzbereich [fu, fo] mit fu und fo als untere und obere Frequenzgrenze des Frequenzbandes der Antenne bevorzugt VSWR ≤ 3, wobei für die Bandbreite fo/fu ≥ 1,4 gilt.The emission surface advantageously has a maximum length L max ≦ 0.6 λ max , a maximum width B max ≦ λ max and a maximum height H max ≦ 0.4 λ max with respect to the base area, where λ max is the free space wavelength at the lower frequency limit f u is the frequency band of the antenna. For the VSWR VSWR in a frequency range [f u , f o ] with f u and f o as the lower and upper frequency limit of the frequency band of the antenna is preferably VSWR ≤ 3, where for the bandwidth f o / f u ≥ 1.4 applies.
Die Abstrahlfläche weist vorteilhaft eine konstante Taperung auf. In diesem Fall weist die Abstrahlfläche die Form eines gleichschenkligen Dreiecks auf. Dabei bildet die Abstrahlfläche zusammen mit der Grundfläche einen TEM-Wellenleiter mit konstantem Wellenwiderstand.The radiating surface advantageously has a constant tapering. In this case, the radiating surface has the shape of an isosceles triangle. The radiating surface together with the base area forms a TEM waveguide with constant characteristic impedance.
Die Mittel zur Einspeisung elektromagnetischer Energie auf die Antenne sind bevorzugt im Bereich des geringsten Abstandes zwischen Abstrahlfläche und Grundfläche angeordnet. Bei einer dreieckförmigen Abstrahlfläche kann dies zweckmäßig eine Ecke der Abstrahlfläche sein.
Die Einspeisung ist bevorzugt eine koaxiale Einspeisung. Dabei wird der koaxiale Innenleiter galvanisch mit der Abstrahlfläche verbunden, während der Außenleiter galvanisch mit der Grundfläche der Antenne verbunden ist. Die Taperung der Breite der Abstrahlfläche und der Höhe der Abstrahlfläche über der Grundfläche wird dabei zweckmäßig passend zur Impedanz des angeschlossenen Speisekabels gewählt, da dann die an der Speisestelle entstehenden höheren Schwingungsmoden der Antenne nur mit geringer Amplitude angeregt werden.The means for feeding electromagnetic energy to the antenna are preferably arranged in the region of the smallest distance between radiating surface and base surface. In the case of a triangular radiating surface, this may expediently be a corner of the radiating surface.
The feed is preferably a coaxial feed. In this case, the coaxial inner conductor is galvanically connected to the radiating surface, while the outer conductor is galvanically connected to the base of the antenna. The taping of the width of the radiating surface and the height of the radiating surface above the base is suitably chosen to match the impedance of the connected feeder cable, since then the resulting at the feed point higher vibration modes of the antenna are excited only with low amplitude.
Die diskreten Bauelemente, die unterhalb der Abstrahlfläche an vorgebbaren Orten mit vorgebbaren Werten verteilt sind, dienen zur Verbesserung der Anpassung für den unteren Teil des Frequenzbereichs. Werte und Orte lassen sich entsprechend den jeweiligen Forderungen an die Anpassung und an das Strahlungsdiagramm der Antenne wählen. Die diskreten Bauelemente können insbesondere Induktivitäten und/oder Kapazitäten sein.The discrete components, which are distributed below the radiating surface in predeterminable locations with predeterminable values, serve to improve the adaptation for the lower part of the frequency range. Values and locations can be selected according to the respective requirements for the adaptation and to the radiation pattern of the antenna. The discrete components may in particular be inductors and / or capacitors.
Selbstverständlich sind aber auch andere als dreieckförmige Formen und nichtkonstante Höhen- und Breitentaperung der Abstrahlfläche der Antenne im speziellen Fall sinnvoll. Dadurch sind weitere Verbesserungen der Anpassung und der Form des Strahlungsdiagramms möglich.Of course, but other than triangular shapes and non-constant height and Breitentaperung the radiating surface of the antenna in a special case make sense. This allows further improvements in the fit and shape of the radiation pattern.
Der Begriff "diskretes Bauelement" ist funktionell zu verstehen. Hier kann natürlich statt einer diskreten Induktivität oder Kapazität auch eine Ausführung aus einer auf einem Substrat (nicht dargestellt) gedruckten Leitung verwendet werden.The term "discrete component" is to be understood functionally. Here, of course, instead of a discrete inductance or capacitance, an embodiment of a printed on a substrate (not shown) line can be used.
Die erfindungsgemäße Antenne ermöglicht ein sehr breitbandiges Funkverfahren, z.B. Hoppingbetrieb. Außerdem ist eine gleichzeitige Speisung der Antenne mit mehreren Sendelinien, die in einem breiten Frequenzbereich verteilt sind, möglich. Darüber hinaus ist es mit der erfindungsgemäßen Antenne möglich, mehrere in einem breiten Frequenzband liegende Empfangssignale gleichzeitig zu empfangen.The antenna according to the invention enables a very broadband radio method, e.g. Hopping operation. In addition, a simultaneous feeding of the antenna with multiple transmission lines, which are distributed in a wide frequency range possible. Moreover, with the antenna according to the invention it is possible to simultaneously receive a plurality of received signals lying in a wide frequency band.
Ein weiterer Vorteil der erfindungsgemäßen Antenne ist die Möglichkeit, diese breitbandige Antenne direkt vor einer metallischen oder nichtmetallischen Wand zu verwenden, ohne dass sich ihre Anpassung oder ihr Strahlungsdiagramm verschlechtert. Dies ist auch möglich bei konformer Anpassung der Abstrahlfläche an eine eventuell gekrümmte Form der metallischen Wand. Bei einer metallischen Wand kann die Wand selbst als Grundfläche verwendet werden. Die Wand könnte z.B. ein Teil der Oberfläche eines Fahrzeugs, eines Schiffs oder eines Flugzeugs sein. Durch die geringe Bauhöhe der Antenne überragt die Antenne die Fahrzeugoberfläche nur wenig. Dies gilt sowohl für Ausführungen für den VHF-, den UHF und natürlich für den Mikrowellenbereich.Another advantage of the antenna according to the invention is the ability to use this broadband antenna directly in front of a metallic or non-metallic wall without degrading its adaptation or radiation pattern. This is also possible with conformal adaptation of the radiating surface to a possibly curved shape of the metallic wall. For a metallic wall, the wall itself can be used as a base. The wall could e.g. be a part of the surface of a vehicle, a ship or an airplane. Due to the low height of the antenna, the antenna towers only slightly above the vehicle surface. This applies to versions for the VHF, the UHF and of course for the microwave range.
Die Erfindung sowie weitere vorteilhafte Ausführungsformen der Erfindung werden im weiteren anhand von Zeichnungen näher erläutert. Es zeigen :
- Fig. 1
- eine erste Ausführungsform eines Antennenaufbaus gemäß der vorliegenden Erfindung in perspektivischer Darstellung,
- Fig. 2
- den Antennenaufbau von Fig. 1 in Seitenansicht,
- Fig. 3
- den Antennenaufbau von Fig. 1 in Draufsicht,
- Fig. 4
- eine zweite Ausführungsform eines Antennenaufbaus gemäß der vorliegenden Erfindung in perspektivischer Darstellung,
- Fig. 5
- den Kurvenverlauf des Stehwellenverhältnisses an der Speisestelle der in Fig. 4 dargestellten Ausführung als Funktion der Frequenz,
- Fig. 6
- eine dritte Ausführungsform einer erfindungsgemäßen Antenne mit einer zweiten Abstrahlfläche.
- Fig. 7
- eine beispielhafte Ausführungsform einer Anwendung einer erfindungsgemäßen Antenne einer ersten oder zweiten Ausführungsform.
- Fig. 1
- A first embodiment of an antenna assembly according to the present invention in perspective view,
- Fig. 2
- the antenna structure of Fig. 1 in side view,
- Fig. 3
- the antenna structure of Fig. 1 in plan view,
- Fig. 4
- A second embodiment of an antenna assembly according to the present invention in a perspective view,
- Fig. 5
- the waveform of the standing wave ratio at the feed point of the embodiment shown in Figure 4 as a function of frequency,
- Fig. 6
- A third embodiment of an antenna according to the invention with a second emission surface.
- Fig. 7
- an exemplary embodiment of an application of an antenna according to the invention a first or second embodiment.
Das Antennenelement in einem Aufbau in einer ersten bevorzugten Ausführungsform gemäß Fig. 1 bis 3 umfasst eine Abstrahlfläche 1 und eine metallische Grundfläche 2. Zweckmäßig ist an der Speisestelle ein Anschluss 7 - im Weiteren als Signalanschluss bezeichnet - , insbesondere in Form eines Koaxialkabels (nicht dargestellt), zum Zuführen von Signalen an die Abstrahlfläche 1 vorhanden. Der Signalanschluss 7 mittels eines Koaxialkabels kann dabei mittels einem Fachmann bekannter Maßahmen erfolgen, wobei der Innenleiter des Koaxialkabels mit der Abstrahlfläche 1 und der Außenleiter des Koaxialkabels mit der Grundfläche 2 leitend verbunden ist. Zweckmäßig kann das Antennenelement in einem Gehäuse (nicht dargestellt) untergebracht sein.
Im Bereich 5 des Signalanschlusses 7 können bevorzugt Mittel, z.B. Stifte (nicht dargestellt) vorhanden sein, welche ein sicheres Halten der Abstrahlfläche 1 in einer festen, von der Grundfläche 2 getrennten Position ermöglichen. Diese Stifte bestehen zweckmäßig aus elektrisch nicht leitenden Material, z.B. Kunststoff. Selbstverständlich sind auch andere dem Fachmann bekannte Halterungen möglich, z. B. die Füllung des Raumbereichs zwischen der Grundfläche 2 und der Abstrahlfläche 1 mit dielektrischen Material passender Dielektrizitätskonstante.The antenna element in a structure in a first preferred embodiment according to FIGS. 1 to 3 comprises a radiating
In the
Fig. 4 zeigt eine zweite Ausführungsform einer erfindungsgemäßen Antenne. Bei dieser Ausführungsform sind die Teile der Abstrahlfläche 1 im Bereich 4 der diskreten Bauelemente 3 und/oder im Bereich 5 des Signalanschlusses (nicht dargestellt) parallel zur Grundfläche 2 ausgeführt. Dadurch lässt sich die Handhabung der Abstrahlfläche 1 und insbesondere die Befestigung der diskreten Bauelemente 3 und des Signalanschlusses an die Abstrahlfläche 1 verbessern.4 shows a second embodiment of an antenna according to the invention. In this embodiment, the parts of the radiating
Die Abstrahlfläche 1 weist im Bereich 4 der diskreten Bauelemente 3 beispielhaft einen Abstandswert Hmax von 0,13*λmax zur Grundfläche 2 auf, wobei λmax dabei die Freiraumwellenlänge an der unteren Frequenzgrenze fu des Frequenzbandes der Antenne ist. Der Abstand Hmax wird hierbei zweckmäßig als Lot auf die Grundfläche 2 bestimmt. Die Größe Lmax beträgt beispielhaft 0,25*λmax, die Größe Bmax beträgt beispielhaft ebenfalls 0,25*λmax. Ort und Wert der diskreten Bauelemente werden in Abhängigkeit von Hmax, Lmax und Bmax gewählt. Selbstverständlich kann der Abstand Hmax zwischen der Abstrahlfläche 1 und der Grundfläche 2 in dem Bereich 4 der diskreten Bauelemente 3 aus Gründen einer verbesserten Anpassung verändert werden.In the
Vorteilhaft weist die Abstrahlfläche 1 einen senkrecht zur ihrer Längenausdehnung L ausgeführten Schlitz 11 auf. Dadurch wird die Abstrahlfläche 1 in einen hinteren Teil HT und einen vorderen Teil VT aufgespaltet. Vorteilhaft wird dieser Schlitz 11 durch diskrete Blindelemente (nicht dargestellt), z.B. Induktivitäten überbrückt. Neben der großen Breitbandigkeit, die die Beschaltung mit geeigneten Blindelementen bewirkt, lässt sich durch den Wert und den Ort der Blindelemente auch das Strahlungsdiagramm der Antenne beeinflussen.Advantageously, the radiating
Der Begriff "diskretes Blindelement" ist funktionell zu verstehen. Hier kann natürlich statt einer diskreten Induktivität auch eine Ausführung aus einer auf einem Substrat (nicht dargestellt) gedruckten Leitung verwendet werden.The term "discrete dummy element" is to be understood functionally. Here, of course, instead of a discrete inductance, an embodiment of a printed on a substrate (not shown) line can be used.
Die Grundfläche 2 kann bei der ersten und zweiten Ausführungsform der Erfindung vorteilhaft eben, einfach- oder doppeltgekrümmt und die Abstrahlfläche 1 zu der Krümmung der Grundfläche 2 konform ausgeführt. Dadurch ist es möglich, den Antennenaufbau auch auf beliebig geformten Trägerstrukturen mit geringem Raumbedarf anzubringen.In the first and second embodiments of the invention, the
Fig. 5 zeigt den Kurvenverlauf des Stehwellenverhältnisses VSWR an der Speisestelle des Signalanschlusses der in Fig. 4 dargestellten Ausführung als Funktion der Frequenz. Das zugrunde liegende Verhältnis stehender Wellen wird basierend auf der Streuung der Spannung berechnet, welche am Eingang des Anschlusses der Speisemittel an der Abstrahlfläche 1 gemessen werden.
Im Frequenzbereich von 220-450 MHz beträgt das Stehwellenverhältnis VSWR weniger als 2. Im gesamten Frequenzband von 200-1050 MHz beträgt das Stehwellenverhältnis weniger als 3.5 shows the curve of the standing wave ratio VSWR at the feed point of the signal terminal of the embodiment shown in FIG. 4 as a function of the frequency. The underlying standing wave ratio is calculated based on the dispersion of the voltage measured at the input of the terminal of the feeding means at the radiating
VSWR is less than 2 in the frequency range 220-450 MHz. In the entire frequency band of 200-1050 MHz, the VSWR is less than 3.
Fig. 6 zeigt eine dritte Ausführungsform einer erfindungsgemäßen Antenne. Bei dieser Ausführungsform ist die Grundfläche durch eine zweite Abstrahlfläche 1 a ersetzt, wobei die zweite Abstrahlfläche 1 a an der durch die Grundfläche aufgespannten Ebene (nicht dargestellt) gespiegelt ist.
Die Teile der Abstrahlfläche 1, 1 a im Bereich 4 der diskreten Bauelemente 3 und/oder im Bereich 5 des Anschlusses 7 sind parallel zur Grundfläche ausgeführt. Selbstverständlich ist es auch möglich, dass die Abstrahlflächen 1, 1 a eine in Fig. 1 und 2 dargestellte Form aufweisen.Fig. 6 shows a third embodiment of an antenna according to the invention. In this embodiment, the base surface is replaced by a second radiating surface 1a, wherein the second radiating surface 1a is mirrored on the plane defined by the base plane (not shown).
The parts of the radiating
In Fig.7 ist eine beispielhafte Ausführungsform einer Anwendung einer erfindungsgemäßen Antenne dargestellt. Mehrere Antennen 9 sind am Umfang eines Zylinders 8 angeordnet. Die Form des Zylinders 8 kann dabei zweckmäßig die einem Schiffsmast ähneln. Die Antennen 9 sind auf die Außenfläche des Zylinders 8 gesetzt und werden als Sendeantennen für verschiedene Frequenzbereiche verwendet. Mögliche Sende- bzw. Empfangsbereiche sind dabei z.B. 30-100 MHz, 100-200 MHz und 200-600 MHz.FIG. 7 shows an exemplary embodiment of an application of an antenna according to the invention.
Die Zylinderarrays werden im Sendefall für Kommunikation und elektronische Gegenmaßnahmen zur Störung gegnerischer Kommunikationseinrichtungen verwendet. Im Empfangsfall werden die Arrays für Kommunikation und für elektronische Unterstützungsmaßnahmen, d.h. Auffassung, Peilung und Klassifikation fremder Kommunikationseinrichtungen verwendet. Zweckmäßig werden die Antennen 9 dabei über so genannte Strahlformungsnetzwerke 10 (beamforming) sowohl in Summendiagramme als auch in Einzelstrahlerdiagramme auf die Endgeräte, also Sender und Empfänger verteilt.The cylinder arrays are used in the transmission case for communication and electronic countermeasures to disturb opposing communication devices. In the receive case, the arrays for communication and for electronic support measures, i. Conception, bearing and classification of foreign communication devices used. Expediently, the
Claims (15)
dadurch gekennzeichnet, dass
zwischen der Abstrahlfläche (1) und der Grundfläche (2) ein oder mehrere diskrete Bauelemente (3) angeordnet sind, wobei die Abstrahlfläche (1) bezüglich ihrer Breite B und bezüglich ihrer Höhe H zur Grundfläche (2) eine Taperung aufweist.Antenna comprising a radiating surface (1) and a base (2),
characterized in that
between the emission surface (1) and the base surface (2) one or more discrete components (3) are arranged, wherein the emission surface (1) with respect to their width B and with respect to their height H to the base surface (2) has a taping.
mit fu : untere Frequenzgrenze des Frequenzbandes der Antenne und
fo : oberen Frequenzgrenze des Frequenzbandes der Antenne das Stehwellenverhältnis VSWR ≤ 3 ist, wobei für die Bandbreite fo/fu≥ 1,4 gilt.Antenna according to one of the preceding claims, wherein in a frequency range [f u , f o ]
with f u : lower frequency limit of the frequency band of the antenna and
f o : upper frequency limit of the frequency band of the antenna, the VSWR ≤ 3, wherein for the bandwidth f o / f u ≥ 1.4 applies.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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DE102004036001A DE102004036001A1 (en) | 2004-07-23 | 2004-07-23 | Broadband antenna with low height |
Publications (2)
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EP1619751A1 true EP1619751A1 (en) | 2006-01-25 |
EP1619751B1 EP1619751B1 (en) | 2010-10-06 |
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EP05012307A Not-in-force EP1619751B1 (en) | 2004-07-23 | 2005-06-08 | Wideband antenna of low profile |
Country Status (5)
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US (1) | US7548204B2 (en) |
EP (1) | EP1619751B1 (en) |
AT (1) | ATE484089T1 (en) |
DE (2) | DE102004036001A1 (en) |
ES (1) | ES2351191T3 (en) |
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JP4982252B2 (en) * | 2007-05-30 | 2012-07-25 | 寛治 大塚 | Transmission line aperture antenna device |
US20140320364A1 (en) * | 2013-04-26 | 2014-10-30 | Research In Motion Limited | Substrate integrated waveguide horn antenna |
TWI528642B (en) * | 2013-09-05 | 2016-04-01 | 啟碁科技股份有限公司 | Antenna and electronic device |
US10418693B2 (en) * | 2017-04-11 | 2019-09-17 | Fitbit, Inc. | Band latch mechanism and housing with integrated antenna |
US10809666B2 (en) | 2018-05-22 | 2020-10-20 | Fitbit, Inc. | Low-profile band latch mechanism |
US11033082B1 (en) | 2020-04-14 | 2021-06-15 | Fitbit, Inc. | Wearable device straps and attachment hardware therefor |
WO2022172313A1 (en) * | 2021-02-09 | 2022-08-18 | 三菱電機株式会社 | Antenna device |
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Also Published As
Publication number | Publication date |
---|---|
US20060044201A1 (en) | 2006-03-02 |
ES2351191T3 (en) | 2011-02-01 |
ATE484089T1 (en) | 2010-10-15 |
DE502005010330D1 (en) | 2010-11-18 |
DE102004036001A1 (en) | 2006-03-16 |
EP1619751B1 (en) | 2010-10-06 |
US7548204B2 (en) | 2009-06-16 |
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