EP0492022B1 - Wide band radio antenna with weak stationary wave rating - Google Patents
Wide band radio antenna with weak stationary wave rating Download PDFInfo
- Publication number
- EP0492022B1 EP0492022B1 EP90403773A EP90403773A EP0492022B1 EP 0492022 B1 EP0492022 B1 EP 0492022B1 EP 90403773 A EP90403773 A EP 90403773A EP 90403773 A EP90403773 A EP 90403773A EP 0492022 B1 EP0492022 B1 EP 0492022B1
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- Prior art keywords
- antenna
- linear
- value
- antenna according
- linear elements
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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
- H01Q9/44—Resonant antennas with a plurality of divergent straight elements, e.g. V-dipole, X-antenna; with a plurality of elements having mutually inclined substantially straight portions
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/30—Arrangements for providing operation on different wavebands
- H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
- H01Q5/314—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors
- H01Q5/335—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors at the feed, e.g. for impedance matching
Definitions
- the invention relates to a very wide band radio antenna with a low standing wave rate.
- the invention relates to an antenna having, on the one hand, a low standing wave rate especially in the high frequency range, that is to say mainly between 3 and 30 megahertz and on the other hand a good yield on the aforementioned strip.
- the antenna of the invention is particularly intended for mobile communication services which use high frequencies as communication frequencies.
- antennas which are, on the one hand, light and easy to implement, that is to say essentially of small size and, on the other hand, radioelectrically efficient, c 'is to say whose standing wave rate is the lowest possible considering a high efficiency.
- the width of the frequency band in which these communication devices operate is implicitly limited to that in which the antenna can be used without drawbacks.
- the antenna comprises a plurality of linear conductive elements, of different chosen lengths and which, on the one hand, are arranged parallel to the head of a slender support while being electrically isolated from each other and, on the other hand , have one of their ends electrically connected to a common line.
- an antenna of this type has given excellent results in a range of frequencies between 30 and 88 megahertz.
- the length of a monopoly antenna that is to say of an antenna made up of a conductive linear element generally corresponds to a quarter of the wavelength at its lowest frequency of use of the antenna.
- one of the linear elements of the antenna according to the above solution should have a length of 18.2 meters which is completely incompatible with the use that l 'We have considered for the antenna object of this application.
- GB-A-685 236 describes another solution according to which an antenna is composed of 3 divergent strands connected to one another at one of their ends which serves as a feed point.
- a result which the invention aims to obtain is a very broadband antenna which has good efficiency as well as a low standing wave rate while being of use compatible with a mobile communication device.
- the subject of the invention is an antenna of the aforementioned type as specified in claim 1.
- an antenna 1 connected by an electrical transmission line 2 to a radio communication device 3 such as a transmitter and / or a receiver.
- the antenna 1 conventionally comprises several linear elements 4 conductors of electricity and these elements 4 are each electrically connected to the transmission line 2 by one 40 of their ends 40, 41, which end is after said "base".
- the antenna is studied to present a low standing wave rate and in particular a standing wave rate less than or equal to five in a very wide frequency band which extends from 3 to 30 megahertz.
- the standing wave rate characterizes the propensity of the antennas to reflect through the transmission line the electrical energy which is applied to them via this line by a transmitting device.
- the antenna of the invention also has an efficiency which varies significantly from 10% at the lowest frequency to 25% at the highest frequency.
- the efficiency of an antenna characterizes its ability to disperse into effective electromagnetic energy the electrical energy which it has accepted from the transmitter taking into account its standing wave rate.
- the angle A is between zero and thirty degrees inclusive.
- the resistive means 5 have from one linear element to another all substantially the same Rchoisie value.
- each linear element comprises a resistant means 5 and this is located substantially at a third of the length of the element measured from its end 40 called the base which is associated with the line 2.
- each linear element comprises two resistant means 5 and these means are located approximately one third to two thirds, the other one third to the length of the element measured from its end called base 40.
- each linear element comprises a resistant means 5 and this is located at substantially two thirds of the length of the element measured from its end 40 called the base which is associated with the line 2.
- the antenna comprises three divergent linear elements 1 situated in planes radially oriented around the median axis 42 of the antenna and offset between them by approximately 120 degrees.
- each linear element forms an angle A of approximately 18 ° with the median axis 42 of the antenna.
- the median axis of the antenna will advantageously be oriented vertically and the antenna will in turn be oriented so that its elements diverge towards the sky.
- the antenna makes it possible to obtain the expected results.
- each inductive means 5 is at least in the immediate vicinity of the base 40 of a linear element 4.
- the inductive means may consist of a winding of conductive wire directly produced on the support of the linear element (which support has not been shown any more than the winding).
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Description
L'invention se rapporte à une antenne radioélectrique à très large bande et à faible taux d'onde stationnaire.The invention relates to a very wide band radio antenna with a low standing wave rate.
Plus particulièrement mais non exclusivement l'invention concerne une antenne présentant, d'une part, un faible taux d'onde stationnaire spécialement dans le domaine des hautes fréquences c'est à dire principalement entre 3 et 30 mégahertz et d'autre part un bon rendement sur la bande précitée.More particularly but not exclusively, the invention relates to an antenna having, on the one hand, a low standing wave rate especially in the high frequency range, that is to say mainly between 3 and 30 megahertz and on the other hand a good yield on the aforementioned strip.
On reviendra plus aprés sur ces caractéristiques du taux d'onde stationnaire et de rendement mais on précise qu elles caractérisent essentiellement l'aptitude d'une antenne à disperser effectivement en énergie électromagnétique l'énergie électrique qui lui a été appliquée.We will come back later to these characteristics of the standing wave rate and efficiency but it should be pointed out that they essentially characterize the ability of an antenna to effectively disperse the electromagnetic energy applied to it into electromagnetic energy.
L'antenne de l'invention est particulièrement destinée aux services de communication mobile qui utilisent les hautes fréquences comme fréquences de communication.The antenna of the invention is particularly intended for mobile communication services which use high frequencies as communication frequencies.
Dans ce domaine des transmissions radioélectriques, il est nécessaire de disposer d'antennes qui sont, d'une part, légères et faciles à mettre en oeuvre c'est à dire essentiellement de faible encombrement et, d'autre part, radioélectriquement performantes, c'est à dire dont le taux d'onde stationnaire est le plus faible possible en considérant un fort rendement.In this field of radio transmissions, it is necessary to have antennas which are, on the one hand, light and easy to implement, that is to say essentially of small size and, on the other hand, radioelectrically efficient, c 'is to say whose standing wave rate is the lowest possible considering a high efficiency.
Actuellement, on sait réaliser des antennes à fort rendement et dont le taux d'onde stationnaire est faible mais ce uniquement dans une bande de fréquences très étroite.Currently, it is known to produce antennas with high efficiency and whose standing wave rate is low, but only in a very narrow frequency band.
Pour pouvoir couvrir une large bande de fréquences, il est connu de scinder la bande en domaines successifs et d'utiliser une antenne spécifique à chaque domaine selon la fréquence de communication.To be able to cover a wide frequency band, it is known to divide the band into successive domains and to use an antenna specific to each domain according to the communication frequency.
Egalement, il est connu de n'utiliser qu'une seule antenne mais de la réadapter et/ou de la réaccorder électroniquement pour qu'elle présente des caractéristiques radioélectriques acceptables à la fréquence de communication choisie.Also, it is known to use only a single antenna but to readjust it and / or to retune it electronically so that it has acceptable radioelectric characteristics at the chosen communication frequency.
Ces manipulations de changement d'antennes et/ou de réaccordement peuvent bien entendu être automatisées.These manipulations of antenna change and / or retuning can of course be automated.
Elles s'avèrent quoiqu'il en soit incompatibles avec une nouvelle technique de communication qui tend à se développer et consiste à mettre en oeuvre des dispositifs émetteur et récepteur qui, en synchronisme changent rapidement et fréquemment leur fréquence de fonctionnement.However, they turn out to be incompatible with a new communication technique which is tending to develop and consists in using transmitter and receiver devices which, in synchronism rapidly and frequently change their operating frequency.
On conçoit l'intérêt de cette technique pour les communications confidentielles.We understand the interest of this technique for confidential communications.
Toutefois, la largeur de la bande de fréquences dans laquelle opèrent ces dispositifs de communication est implicitement limitée à celle dans laquelle l'antenne peut être utilisée sans inconvénients.However, the width of the frequency band in which these communication devices operate is implicitly limited to that in which the antenna can be used without drawbacks.
Cependant, on est récemment parvenu à étendre la largeur de la bande utile d'une antenne particulièrement dans le domaine des trés hautes fréquences c'est à dire par exemple entre 30 et 90 mégahertz.However, it has recently been possible to extend the width of the useful band of an antenna, particularly in the field of very high frequencies, that is to say for example between 30 and 90 megahertz.
Notamment, l'une des solutions adoptées est décrite dans le brevet US-A-4.302.760 et réside essentiellement dans la construction de l'antenne.In particular, one of the solutions adopted is described in patent US-A-4,302,760 and essentially resides in the construction of the antenna.
Précisément, l'antenne comprend une pluralité d'éléments linéaires conducteurs, de longueurs choisies différentes et qui, d'une part, sont disposés parallélement en tête d'un support longiligne en étant électriquement isolés les uns des autres et, d'autre part, ont l'une de leurs extrémités électriquement reliées à une ligne commune.Specifically, the antenna comprises a plurality of linear conductive elements, of different chosen lengths and which, on the one hand, are arranged parallel to the head of a slender support while being electrically isolated from each other and, on the other hand , have one of their ends electrically connected to a common line.
D'aprés les titulaires du brevet précité, une antenne de ce type a donné d'excellents résultats dans une gamme de fréquences comprises entre 30 et 88 mégahertz.According to the holders of the aforementioned patent, an antenna of this type has given excellent results in a range of frequencies between 30 and 88 megahertz.
Malheureusement, cette solution n'a pu être exploitée avec succés dans le domaine des communications à haute fréquence c'est à dire en dessous de 30 mégahertz.Unfortunately, this solution could not be successfully exploited in the field of high frequency communications, that is to say below 30 megahertz.
En effet, de manière connue, la longueur d'une antenne monopole c'est à dire d' une antenne constituée d'un élément linéaire conducteur correspond en règle générale au quart de la longueur d'ondes à sa fréquence la plus basse d'utilisation de l'antenne.In fact, in known manner, the length of a monopoly antenna, that is to say of an antenna made up of a conductive linear element generally corresponds to a quarter of the wavelength at its lowest frequency of use of the antenna.
Précisément pour couvrir une bande de fréquences situées au dessus de 3 mégahertz, l'un des éléments linéaires de l'antenne selon la solution précitée devrait avoir une longueur de 18,2 mètres ce qui est tout à fait incompatible avec l'usage que l'on a envisagé pour l'antenne objet de la présente demande.Precisely to cover a frequency band located above 3 megahertz, one of the linear elements of the antenna according to the above solution should have a length of 18.2 meters which is completely incompatible with the use that l 'We have considered for the antenna object of this application.
Dans le domaine des hautes fréquences, une autre solution a été adoptée par les techniciens ; elle est décrite dans le brevet FR-A-2.597.266.In the high frequency domain, another solution was adopted by the technicians; it is described in patent FR-A-2,597,266.
Elle conduit à réduire le rapport d'amplitudes de tensions essentiellement pour les fréquences les plus basses de la bande de fréquences à couvrir et ce en interposant des moyens électriquement résistants entre l'antenne et la ligne de transmission à laquelle elle est connectée.It leads to a reduction in the voltage amplitude ratio essentially for the lowest frequencies of the frequency band to be covered, by interposing electrically resistant means between the antenna and the transmission line to which it is connected.
Toutefois, cette solution ne donne de bons résultats que pour une bande de fréquences assez peu étendue c'est à dire notamment lorsque le rapport entre la fréquence la plus haute et la fréquence la plus basse de la bande est de trois.However, this solution gives good results only for a relatively small frequency band, that is to say in particular when the ratio between the highest frequency and the lowest frequency of the band is three.
D'ailleurs, si l'on cherchait à appliquer cette solution unique à une antenne de trés large bande par exemple une bande dont le rapport entre la fréquence la plus haute et la fréquence la plus basse est de 10 , on pourrait obtenir un faible rapport d'amplitudes de tension mais le rendement de l'antenne serait également trés faible.Moreover, if we sought to apply this unique solution to a very wide band antenna, for example a band whose ratio between the highest frequency and the lowest frequency is 10, we could obtain a low ratio voltage amplitudes but the antenna efficiency would also be very low.
Le brevet GB-A- 685 236 décrit une autre solution selon laquelle une antenne est composée de 3 brins divergents reliés entre eux à l'une de leurs extrémités qui sert de point d'alimentation.GB-A-685 236 describes another solution according to which an antenna is composed of 3 divergent strands connected to one another at one of their ends which serves as a feed point.
Un résultat que l'invention vise à obtenir est une antenne de trés large bande qui présente un bon rendement ainsi qu'un faible taux d'onde stationnaire tout en étant d'une utilisation compatible avec un dispositif mobile de communication.A result which the invention aims to obtain is a very broadband antenna which has good efficiency as well as a low standing wave rate while being of use compatible with a mobile communication device.
A cet effet, l'invention a pour objet une antenne du type précité telle que spécifiée dans la revendication 1.To this end, the subject of the invention is an antenna of the aforementioned type as specified in
L'invention sera bien comprise à l'aide de la description ci-aprés faite à titre d'exemple non limitatif en regard du dessin ci-annexé qui représente schématiquement :
- figure 1 : un schéma électrique simplifié de l'antenne,
- figure 2 : le graphique de l'évolution du taux d'onde stationnaire en fonction de la fréquence,
- figure 3 : vue en perspective, une antenne selon l'invention dans une forme préférée de réalisation.
- FIG. 1: a simplified electrical diagram of the antenna,
- FIG. 2: the graph of the evolution of the standing wave rate as a function of the frequency,
- Figure 3: perspective view, an antenna according to the invention in a preferred embodiment.
En se reportant au dessin, on voit une antenne 1 reliée par une ligne électrique de transmission 2 à un dispositif 3 de communication radioélectrique tel un émetteur et/ou un récepteur.Referring to the drawing, we see an
Tel que cela apparaît l'antenne 1 comprend classiquement plusieurs éléments linéaires 4 conducteurs de l'électricité et ces éléments 4 sont chacun électriquement relié à la ligne de transmission 2 par l'une 40 de leurs extrémités 40, 41, laquelle extrémité est ci-après dite "base".As it appears, the
Tel que cela apparaît en figure 2, l'antenne est étudiée pour présenter un faible taux d'onde stationnaire et notamment un taux d'onde stationnaire inférieur ou égal à cinq dans une trés large bande de fréquence qui s'étend d'ailleurs de 3 à 30 mégahertz.As shown in Figure 2, the antenna is studied to present a low standing wave rate and in particular a standing wave rate less than or equal to five in a very wide frequency band which extends from 3 to 30 megahertz.
On précise que le taux d'onde stationnaire caractérise la propension qu'ont les antennes à réfléchir à travers la ligne de transmission l'énergie électrique qui leur est appliquée via cette ligne par un dispositif émetteur.It is specified that the standing wave rate characterizes the propensity of the antennas to reflect through the transmission line the electrical energy which is applied to them via this line by a transmitting device.
L'antenne de l'invention a en outre un rendement qui évolue sensiblement de 10 % à la fréquence la plus basse à 25 % à la fréquence la plus haute.The antenna of the invention also has an efficiency which varies significantly from 10% at the lowest frequency to 25% at the highest frequency.
On précise également que le rendement d'une antenne caractérise son aptitude à disperser en énergie électromagnétique effective l'énergie électrique qu'elle a acceptée de l'émetteur compte tenu de son taux d'onde stationnaire.It is also specified that the efficiency of an antenna characterizes its ability to disperse into effective electromagnetic energy the electrical energy which it has accepted from the transmitter taking into account its standing wave rate.
Conformément à l'invention, l'antenne 1 est particulière en ce qu'elle comprend au moins deux éléments linéaires 4 qui, en combinaison, d'une part, sont sensiblement de même longueur L et forment avec l'axe médian 42 de l'antenne un angle prédéterminé A dont le sommet est, lorsque l'angle A diffère de zéro degré, un point P voisin de celles dites bases 40 de leurs extrémités 40, 41, à savoir celles qui sont électriquement reliées à la ligne de transmission 2, et d'autre part, comportent chacun :
- au moins un
moyen 5 électriquement résistant interposé entre deux fractions prédéterminées de chaque élément et, - au moins un
moyen 6 électriquement inductif quant à lui interposé sensiblement entre labase 40 de chaque élément 4 et la ligne detransmission 2, ces moyens inductifs 6 ayant des valeurs L1, L2, L3 d'inductance choisies qui sont différentes d'un élément linéaire à un autre.
- at least one electrically resistant means 5 interposed between two predetermined fractions of each element and,
- at least one electrically inductive means 6 meanwhile interposed substantially between the
base 40 of each element 4 and thetransmission line 2, these inductive means 6 having chosen values L1, L2, L3 of inductance which are different from one element linear to another.
Selon l'invention, l'angle A est compris entre zéro et trente degrés inclus.According to the invention, the angle A is between zero and thirty degrees inclusive.
Suivant l'invention, les moyens résistants 5 ont d'un élément linéaire à un autre tous sensiblement une même valeur Rchoisie.According to the invention, the
Dans une forme préférée de réalisation, chaque élément linéaire comprend un moyen résistant 5 et celui-ci est situé sensiblement au tiers de la longueur de l'élément mesuré à partir de son extrémité 40 dite base qui est associée à la ligne 2.In a preferred embodiment, each linear element comprises a
Dans une variante de réalisation, chaque élément linéaire comprend deux moyens 5 résistants et ces moyens sont sensiblement situés l'un au deux tiers, l'autre au tiers de la longueur de l'élément mesuré à partir de son extrémité dite base 40.In an alternative embodiment, each linear element comprises two
Dans une seconde forme de réalisation, chaque élément linéaire comprend un moyen 5 résistant et celui-ci est situé au sensiblement deux tiers de la longueur de l'élément mesuré à partir de son extrémité 40 dite base qui est associée à la ligne 2.In a second embodiment, each linear element comprises a
Conformément à l'invention, dans une forme avantageuse de réalisation, l'antenne comprend trois éléments linéaires 1 divergeants situés dans des plans radialement orientés autour de l'axe médian 42 de l'antenne et décalés entre eux d'environ 120 degrés.According to the invention, in an advantageous embodiment, the antenna comprises three divergent
De préférence, chaque élément linéaire forme un angle A d'environ 18° avec l'axe médian 42 de l'antenne.Preferably, each linear element forms an angle A of approximately 18 ° with the
L'axe médian de l'antenne sera avantageusement orienté verticalement et l'antenne sera quant à elle orientée de manière que ses éléments divergent vers le ciel.The median axis of the antenna will advantageously be oriented vertically and the antenna will in turn be oriented so that its elements diverge towards the sky.
D'après l'inventeur, c'est essentiellement dans la dernière configuration qui vient d'être décrite que l'antenne permet d'obtenir les résultats escomptés.According to the inventor, it is essentially in the last configuration which has just been described that the antenna makes it possible to obtain the expected results.
Précisément en respectant les valeurs ci-aprés indiquées, on est parvenu à construire une antenne qui, composée de trois éléments linéaires chacun seulement d'une longueur d'environ sept mille neuf cents millimètres présente une bande utile de fréquence s'étendant de 3 mégahertz à 30 mégahertz avec un rendement qui évolue de 10 % à la fréquence la plus basse à 25% à la fréquence la plus haute et un rapport d'amplitude de tension inférieur à cinq sur cette bande de fréquences.Precisely respecting the values indicated below, we managed to build an antenna which, composed of three linear elements each only of a length of about seven thousand nine hundred millimeters has a useful frequency band extending from 3 megahertz at 30 megahertz with a yield which varies from 10% at the lowest frequency to 25% at the highest frequency and a voltage amplitude ratio less than five on this frequency band.
L'antenne précitée comprend donc trois éléments linéaires disposés comme précité et comportant d'une part chacune une résistance 5 d'une valeur R de 100 ohms située sensiblement au tiers de sa longueur mesurée depuis son extrémité dite base 40 et d'autre part reliant leur extrémité dite base à la ligne de transmission :
- un premier une
inductance 6 d'une valeur L1 de 0,1 microhenry, - un second une
inductance 6 d'une valeur L2 de 7,5 microhenry, - un troisième une
inductance 6 d'une valeur L3 de 22 microhenry.
- a first an
inductance 6 with a value L1 of 0.1 microhenry, - a
second inductance 6 with an L2 value of 7.5 microhenry, - a third an
inductance 6 with a value L3 of 22 microhenry.
Tel que cela a été représenté, chaque moyen inductif 5 est au moins à proximité immédiate de la base 40 d'un élément linéaire 4.As shown, each inductive means 5 is at least in the immediate vicinity of the
Par exemple, le moyen inductif peut être constitué par un enroulement de fil conducteur directement réalisé sur le support de l'élément linéaire (lequel support n'a pas été représenté pas plus que l'enroulement).For example, the inductive means may consist of a winding of conductive wire directly produced on the support of the linear element (which support has not been shown any more than the winding).
Dans l'exemple non limitatif de réalisation de l'antenne qui vient d'être cité, on remarque la faible longueur des éléments linéaires (inférieure à huit mètres) par rapport à la longueur de ceux d'une antenne classique du type cité dans le préambule (au moins dix huit mètres) pour la même valeur de la fréquence basse.In the nonlimiting example of embodiment of the antenna which has just been mentioned, we note the short length of the linear elements (less than eight meters) compared to the length of those of a conventional antenna of the type cited in the preamble (at least eighteen meters) for the same low frequency value.
Claims (7)
- A radio antenna (1) comprising a plurality of electrically conductive linear elements (4), the said antenna being connected by a transmission line (2) to a communication device (3) such as a transmitter and/or receiver, and comprising at least two linear elements (4) which, in arrangement, firstly are substantially of equal length (L) and form, with the centre line (42) of the antenna, a predetermined angle (A), the vertex of which, when the angle (A) differs from zero degrees, is a point (P) adjacent to the "bases" (40) of their ends (40, 41), i.e. those ends which are electrically connected to the transmission line (2), the said antenna being characterised in that the said linear elements each comprise:- at least one first electrically resistant means (5) interposed between two predetermined parts of each element, and- at least one electrically inductive means (6) interposed between the base (40) of each element (4) and the transmission line (2), these inductive means (6) having selected inductance values (L1, L2, L3) which differ from one linear element to another.
- An antenna according to claim 1, characterised in that:- firstly, it comprises three diverging linear elements (1) located in planes orientated radially about the centre line (42) of the antenna and arranged at approximately 120 degree intervals, and- secondly, each linear element forms an angle of approximately 18° with the centre line (40) [sic-42] of the antenna.
- An antenna according to claim 1 or 2, characterised in that the resistant means (5) of the linear elements all substantially have the same selected value (R).
- An antenna according to claim 2, characterised in that the first resistant means (5) is substantially located at a third of the way along the element measured from its base end (40) connected to the line (2).
- An antenna according to claim 2, characterised in that the first resistant means (5) is substantially located at two-thirds of the way along the element measured from its base end (40) connected to the line (2).
- An antenna according to any one of claims 1 to 5, characterised in that it comprises three linear elements each approximately seven thousand nine hundred millimetres in length and arranged as above, and each firstly comprising a resistor (5) of a value (R) of 100 ohms substantially located at a third of the way along their length measured from their base ends (40), and secondly, connecting their base ends to the transmission line:- a first linear element comprising an inductor (6) of a value (L1) of 0.1 microhenry,- a second linear element comprising an inductor (6) of a value (L2) of 7.5 microhenries,- a third linear clement comprising on inductor (6) of a value (L3) of 22 microhenries.
- An antenna according to any one of claims 1 to 6, characterised in that each linear element comprises a second resistant means (5), and in that these first and second means are substantially located one at two-thirds and one at one third of the way along the element measured from its base end (40).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE1990616446 DE69016446T2 (en) | 1990-12-26 | 1990-12-26 | Broadband radio antenna with a small standing wave ratio. |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8806899A FR2650441B1 (en) | 1988-05-16 | 1988-05-16 | VERY BROADBAND RADIO ANTENNA WITH LOW STATIONARY WAVE RATE |
| CA002033621A CA2033621C (en) | 1988-05-16 | 1991-01-04 | Low standing wave ratio very wide band radio antenna |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0492022A1 EP0492022A1 (en) | 1992-07-01 |
| EP0492022B1 true EP0492022B1 (en) | 1995-01-25 |
Family
ID=25674429
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP90403773A Expired - Lifetime EP0492022B1 (en) | 1988-05-16 | 1990-12-26 | Wide band radio antenna with weak stationary wave rating |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0492022B1 (en) |
| CA (1) | CA2033621C (en) |
| FR (1) | FR2650441B1 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6057805A (en) * | 1996-08-19 | 2000-05-02 | Emc Test Systems, L.P. | Broad band shaped element antenna |
| US6570544B2 (en) * | 2001-05-08 | 2003-05-27 | Litton Systems, Inc. | Radiator components that serve to transmit information over frequencies in range with one or more octaves less than or equal to thirty megahertz and that comprise major dimension less than or equal to nine meters |
| ES2399437B1 (en) * | 2011-08-22 | 2014-02-11 | Juan Carlos GARCIA CAMACHO | PORTABLE DTT ANTENNA |
| ES2534951B1 (en) * | 2015-02-11 | 2016-02-08 | Juan Carlos GARCÍA CAMACHO | DTT portable antenna |
| WO2020250386A1 (en) * | 2019-06-13 | 2020-12-17 | 三菱電機株式会社 | Antenna device |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2218741A (en) * | 1938-05-24 | 1940-10-22 | Telefunken Gmbh | Antenna for broad frequency bands |
| GB685236A (en) * | 1950-09-04 | 1952-12-31 | G S V Marine & Commercial Ltd | Improvements in and relating to aerials and their construction |
| IL58902A (en) * | 1979-12-09 | 1988-01-31 | Israel State | Broad band,small size monopole-transmission line antenna for radio frequencies |
-
1988
- 1988-05-16 FR FR8806899A patent/FR2650441B1/en not_active Expired - Fee Related
-
1990
- 1990-12-26 EP EP90403773A patent/EP0492022B1/en not_active Expired - Lifetime
-
1991
- 1991-01-04 CA CA002033621A patent/CA2033621C/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| CA2033621C (en) | 1994-09-13 |
| EP0492022A1 (en) | 1992-07-01 |
| CA2033621A1 (en) | 1992-07-05 |
| FR2650441B1 (en) | 1991-11-29 |
| FR2650441A1 (en) | 1991-02-01 |
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