EP0083262A1 - Short radiowave antenna for a portable transmitter-receiver - Google Patents

Short radiowave antenna for a portable transmitter-receiver Download PDF

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Publication number
EP0083262A1
EP0083262A1 EP82402265A EP82402265A EP0083262A1 EP 0083262 A1 EP0083262 A1 EP 0083262A1 EP 82402265 A EP82402265 A EP 82402265A EP 82402265 A EP82402265 A EP 82402265A EP 0083262 A1 EP0083262 A1 EP 0083262A1
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EP
European Patent Office
Prior art keywords
blades
antenna
antenna according
strips
stacked
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.)
Withdrawn
Application number
EP82402265A
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German (de)
French (fr)
Inventor
Joel Jeannolle
Michel Fiat
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Thales SA
Original Assignee
Thomson CSF SA
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Publication date
Application filed by Thomson CSF SA filed Critical Thomson CSF SA
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/08—Means for collapsing antennas or parts thereof
    • H01Q1/085—Flexible aerials; Whip aerials with a resilient base

Definitions

  • the present invention relates to a short antenna, for portable electromagnetic wave transceiver.
  • Antennas of this type sometimes have to operate in a natural environment, such as undergrowth which can severely test their mechanical resistance.
  • the antenna In these operating conditions, the antenna must not hinder the operator's advance, it must be able to bend easily in contact with obstacles and return to its vertical rectilinear position as soon as possible when the obstacle has disappeared in order to '' best ensure its antenna function.
  • To obtain good mechanical strength of the antenna several embodiments are already known.
  • the antenna is constituted by several metal blades, juxtaposed in the direction of their thickness and oriented so that the directions of their major axes are parallel to each other, the blades being fixed by one of their ends to a tip of connection and between them by intermediate points located along the longitudinal axis of the antenna using rivets.
  • the metal blades are slightly curved across the width. The blades are assembled in groups and so that the smallest are located outside the antenna.
  • This embodiment has both electrical and mechanical drawbacks. Indeed, the high frequency current which moves on the external blades of the antenna encounters discontinuities with each change of blade length. These discontinuities introduce disturbances which affect the proper functioning of the transceiver station. These discontinuities appear all the more annoying when the antenna is painted. To ensure good electrical continuity, the rivets are sometimes made of copper and therefore not very resistant. The mechanical blocking of the blades, makes that the forces on the metal are very important at the change of section, because at these places, the variations brutal cross-sections cause significant cutting forces. Furthermore, crossing the rivets creates stress concentration zones at the places where the efforts are greatest and prevents the blades from sliding relative to each other.
  • rivets pass through openings made in the blades of the antenna so as to allow relative sliding of the rivets relative to the blades, and the blades of greater lengths are arranged outside of the antenna.
  • the solution adopted for this last embodiment greatly improves the mechanical and electrical properties of the antenna, however the presence of the rivets leads to a phenomenon of wear of these which in the long term adversely affects the mechanical properties of the antenna.
  • the invention aims to remedy these drawbacks.
  • the subject of the invention is a short antenna for portable electromagnetic wave transceiver comprising several blades, roughly planar, of different lengths, having major axes roughly parallel to each other and located in the same plane perpendicular to the faces of the blades, the blades being stacked in the direction of their thickness and fixed by one of their ends to the same connection end piece, characterized in that the length of the blades is determined so that the total thickness of the blades, stacked at any point, or approximately proportional to the square root of the distance separating this point, from the end of the antenna opposite to the connection end-piece and in that the maintenance of the blades between them is ensured by an insulating device, surrounding everything where part of the antenna inside which the blades can slide.
  • the antenna shown in Figure 1 includes a tip 1 and a set of six flat blades numbered from 2 to 7.
  • the tip 1 consists of a threaded rod 9, a smooth hole 10 made in the axis of rod 9 and a blade support 11.
  • the smooth hole 10 is intended to receive the connection pin, not shown, of the antenna to ensure its connection to the transceiver station also not shown.
  • the blade support 11 is constituted by a shoulder 12 and by a stop 13 perpendicular to the flat face of the shoulder 12.
  • the blades 2 to 7 each have one of their ends in contact with the flat face of the shoulder 12 and are held tight between leather and flesh between the stop 13 and a removable plate 14 by means of the rivets 15 and 16.
  • the blades 2 to 7 are stacked in the direction of their thickness between the stop 13 of the blade support and the plate 14 so that the blades 2 and 7 which have the longest lengths are located outside of the other blades on either side thereof.
  • the length of the slats is defined so that the total thickness of the stacked slats, at each point of the central axis (A, A '), roughly corresponds to the theoretical shape that an equivalent solid beam would have, in same material as that of the blades and of equal resistance, embedded at one end and loaded at the other end.
  • the number of blades constituting the antenna 1 increases as the distance from the end of the antenna opposite to the end piece increases of connection.
  • the transitions of the number of blades along the longitudinal axis of the antenna appear at points P to P 5 of FIG. 1.
  • the antenna comprises a blade, and at point P ,, located to the left of point P o , the antenna has two blades on the left and a blade on the right.
  • the antenna At point P 2 intermediate between point P 3 and point P 1, the antenna has three blades on the left and two blades on the right.
  • the number of blades located to the left of these points is 4, 5 and 6 blades respectively.
  • the number N of blades located at the tip is naturally a function of the stresses applied to the sections of the blades located at the location of this tip, the mechanical strength of the blades used and the thickness of these. If N denotes the number of blades located at the tip, and e the thickness of a blade, the product Ne is, according to formula (1) above, proportional to the square root of the length L of the antenna.
  • n denotes the number of blades located to the right of an intermediate transition point
  • the product of the number n by the thickness e of a blade must also be proportional according to formula (1) above to the square root the distance between the intermediate point considered and the end opposite the connection end piece.
  • the quotient of the number N by the number n of blades is equal to the square root of the length of the antenna divided by the distance x separating an intermediate point from the end opposite the connection end-piece.
  • the distance x separating a transition point from the end opposite to the connection end piece is therefore determined by the formula (2).
  • the length of a blade is approximately equal to the length L of the antenna subtracted from the distance x separating the end of the blade from the end of the antenna, the length of a blade is determined by the relationship
  • the blades are held together by an insulating device 17 made of elastomer or thermosetting plastic forming an insulating dielectric sheath surrounding the assembly of the blades and also covering, if necessary, the blade support 16 to improve its robustness, or composed of metal or insulating loops not shown, distributed regularly along the boards and each fixed on a single outer board.
  • the mechanical sheath 17 also has the role of improving the contact by hand, of reducing the acoustic noise of the antenna, of damping the mechanical vibrations which can occur when the antenna is subjected to a shock.
  • the two large outer blades 2 and 7 may be copper-coated with a coating adapted to the frequency of the electromagnetic wave radiated by the antenna.
  • the inner blades can be made of an insulating material, for example, a sufficiently resilient, flexible and robust plastic or an elastomer. In order to facilitate the; sliding of the blades relative to each other, when the antenna is bent on itself, a lubrication of the interior blades can be carried out.
  • each blade may be slightly curved in the width direction like this. is shown in the section of Figure 2, which shows the assembly of the blades 2, 3 and 7. This embodiment in fact allows the antenna to always bend so as to present the obstacle with its most opposite face flexible and present a better erection after the passage of the obstacle.

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  • Support Of Aerials (AREA)

Abstract

The antenna comprises several almost flat strips (2, 3, 4, 5, 6, 7) of different lengths, having major axes parallel to one another and situated in the same plane perpendicular to the faces of the strips, the strips being stacked in their thickness direction and fastened by one of their ends to a same connection adaptor (1), the length of the strips is determined so that the total thickness (h) of the stacked strips at an arbitrary point is almost proportional to the square root of the distance separating this point from the end (P0) of the antenna opposite the connection adaptor, the holding together of the strips is ensured by a device (17) surrounding all or part of the antenna, inside which the strips can slide. Application: Portable radio transmitters-receivers. <IMAGE>

Description

La présente invention concerne une antenne courte, pour émetteur-récepteur d'ondes électromagnétiques portable.The present invention relates to a short antenna, for portable electromagnetic wave transceiver.

Les antennes de ce type ont quelquefois à fonctionner dans un environnement naturel, tel que des sous bois qui peut mettre à rude épreuve leur résistance mécanique. Dans ces conditions d'exploitation, l'antenne ne doit pas gêner l'avance de l'opérateur, elle doit pouvoir se plier facilement au contact des obstacles et reprendre le plus rapidement possible sa position rectiligne verticale lorsque l'obstacle a disparu afin d'assurer au mieux sa fonction d'antenne. Pour obtenir une bonne résistance mécanique de l'antenne, plusieurs réalisations sont déjà connues.Antennas of this type sometimes have to operate in a natural environment, such as undergrowth which can severely test their mechanical resistance. In these operating conditions, the antenna must not hinder the operator's advance, it must be able to bend easily in contact with obstacles and return to its vertical rectilinear position as soon as possible when the obstacle has disappeared in order to '' best ensure its antenna function. To obtain good mechanical strength of the antenna, several embodiments are already known.

Dans une première réalisation l'antenne est constituée par plusieurs lames métalliques, juxtaposées dans le sens de leur épaisseur et orientées de façon que les directions de leurs grands axes soient parallèles entre elles, les lames étant fixées par une de leurs extrémités à un embout de connexion et entre elles par des points intermédiaires situés le long de l'axe longitudinal de l'antenne à l'aide de rivets. Les lames de métal sont légèrement courbées dans le sens de la largeur. Les lames sont assemblées par groupes et de façon que les plus petites soient situées à l'extérieur de l'antenne.In a first embodiment, the antenna is constituted by several metal blades, juxtaposed in the direction of their thickness and oriented so that the directions of their major axes are parallel to each other, the blades being fixed by one of their ends to a tip of connection and between them by intermediate points located along the longitudinal axis of the antenna using rivets. The metal blades are slightly curved across the width. The blades are assembled in groups and so that the smallest are located outside the antenna.

Cette réalisation présente des inconvénients à la fois électriques et mécaniques. En effet, le courant haute fréquence qui se déplace sur les lames extérieures de l'antenne rencontre des discontinuités à chaque changement de longueur de lame. Ces discontinuités introduisent des perturbations qui nuisent au bon fonctionnement du poste émetteur-récepteur. Ces discontinuités apparaissent d'ailleurs d'autant plus gênantes lorsque l'antenne est peinte. Pour assurer une bonne continuité électrique, les rivets sont parfois en cuivre donc peu résistants. Le blocage mécanique des lames, fait que les efforts sur le métal sont très importants au changement de section, car à ces endroits, les variations brutales de section provoquent des efforts tranchants importants. Par ailleurs, la traversée des rivets crée des zones de concentration de contraintes aux endroits où les efforts sont les plus importants et empêche le glissement des lames les unes par rapport aux autres.This embodiment has both electrical and mechanical drawbacks. Indeed, the high frequency current which moves on the external blades of the antenna encounters discontinuities with each change of blade length. These discontinuities introduce disturbances which affect the proper functioning of the transceiver station. These discontinuities appear all the more annoying when the antenna is painted. To ensure good electrical continuity, the rivets are sometimes made of copper and therefore not very resistant. The mechanical blocking of the blades, makes that the forces on the metal are very important at the change of section, because at these places, the variations brutal cross-sections cause significant cutting forces. Furthermore, crossing the rivets creates stress concentration zones at the places where the efforts are greatest and prevents the blades from sliding relative to each other.

Selon une autre réalisation, des rivets passent au travers de lumières ménagées dans les lames de l'antenne de façon à permettre un glissement relatif des rivets par rapport aux lames, et les lames de plus grandes longueurs sont disposées à l'extérieur de l'antenne. La solution adoptée pour cette dernière réalisation améliore largement les propriétés mécaniques et électriques de l'antenne, toutefois la présence des rivets entraîne un phénomène d'usure de ceux-ci qui nuisent à la longue aux propriétés mécaniques de l'antenne.According to another embodiment, rivets pass through openings made in the blades of the antenna so as to allow relative sliding of the rivets relative to the blades, and the blades of greater lengths are arranged outside of the antenna. The solution adopted for this last embodiment greatly improves the mechanical and electrical properties of the antenna, however the presence of the rivets leads to a phenomenon of wear of these which in the long term adversely affects the mechanical properties of the antenna.

L'invention a pour but de remédier à ces inconvénients.The invention aims to remedy these drawbacks.

A cet effet l'invention a pour objet, une antenne courte pour émetteur-récepteur d'ondes électromagnétiques portable comprenant plusieurs lames, à peu près planes, de longueurs différentes, ayant des grands axes à peu près parallèles entre eux et situés dans un même plan perpendiculaire aux faces des lames, les lames étant empilées dans le sens de leur épaisseur et fixées par une de leurs extrémités à un même embout de connexion, caractérisée en ce que la longueur des lames est déterminée pour que l'épaisseur totale des lames, empilées en un point quelconque, soit à peu près proportionnelle à la racine carrée de la distance séparant ce point, de l'extrémité de l'antenne opposée à l'embout de connexion et en ce que le maintien des lames entre elles est assuré par un dispositif isolant, entourant tout où partie de l'antenne à l'intérieur duquel les lames peuvent coulisser.To this end, the subject of the invention is a short antenna for portable electromagnetic wave transceiver comprising several blades, roughly planar, of different lengths, having major axes roughly parallel to each other and located in the same plane perpendicular to the faces of the blades, the blades being stacked in the direction of their thickness and fixed by one of their ends to the same connection end piece, characterized in that the length of the blades is determined so that the total thickness of the blades, stacked at any point, or approximately proportional to the square root of the distance separating this point, from the end of the antenna opposite to the connection end-piece and in that the maintenance of the blades between them is ensured by an insulating device, surrounding everything where part of the antenna inside which the blades can slide.

D'autres caractéristiques et avantages de l'invention apparaîtront au cours de la description faite au regard des dessins annexés, donnés uniquement à titre d'exemple et dans lesquels :

  • la figure 1 est une vue en coupe longitudinale de l'antenne selon l'invention,
  • la figure 2 est une vue en coupe transversale de l'antenne selon l'invention.
Other characteristics and advantages of the invention will appear during the description given with regard to the appended drawings, given solely by way of example and in which:
  • FIG. 1 is a view in longitudinal section of the antenna according to the invention,
  • Figure 2 is a cross-sectional view of the antenna according to the invention.

L'antenne représentée à la figure 1 comprend un embout 1 et un ensemble de six lames plates numérotées de 2 à 7. L'embout 1 se compose d'une tige filetée 9, d'un trou lisse 10 pratiqué dans l'axe de la tige 9 et un support de lames 11. Le trou lisse 10 est destiné à recevoir la broche de connexion, non représentée, de l'antenne pour assurer sa liaison au poste émetteur-récepteur également non représenté. Le support de lames 11 est constitué par un épaulement 12 et par une butée 13 perpendiculaire à la face plane de l'épaulement 12. Les lames 2 à 7 ont chacune une de leurs extrémités en contact avec la face plane de l'épaulement 12 et sont maintenues serrées entre cuir et chair entre la butée 13 et une plaque amovible 14 par l'intermédiaire des rivets 15 et 16. Les lames 2 à 7 sont empilées dans le sens de leur épaisseur entre la butée 13 du support de lames et la plaque 14 de façon que les lames 2 et 7 qui ont les plus grandes longueurs se trouvent situées à l'extérieur des autres lames de part et d'autre de celles-ci. La longueur des lames est définie pour que l'épaisseur totale des lames empilées, au niveau de chaque point de l'axe central (A, A'), corresponde à peu près à la forme théorique qu'aurait une poutre pleine équivalente, en même matériau que celui composant les lames et d'égale résistance, encastrée à une extrémité et chargée à l'autre extrémité. Par analogie à une poutre homogène, si h désigne l'épaisseur de la poutre, en un point situé à une distance x de l'extrémité opposée à l'extrémité encastrée, un calcul simplifié de résistance des matériaux montre que l'épaisseur de la poutre est proportionnelle à la racine carrée de la distance x suivant la relation h = A

Figure imgb0001
(1)The antenna shown in Figure 1 includes a tip 1 and a set of six flat blades numbered from 2 to 7. The tip 1 consists of a threaded rod 9, a smooth hole 10 made in the axis of rod 9 and a blade support 11. The smooth hole 10 is intended to receive the connection pin, not shown, of the antenna to ensure its connection to the transceiver station also not shown. The blade support 11 is constituted by a shoulder 12 and by a stop 13 perpendicular to the flat face of the shoulder 12. The blades 2 to 7 each have one of their ends in contact with the flat face of the shoulder 12 and are held tight between leather and flesh between the stop 13 and a removable plate 14 by means of the rivets 15 and 16. The blades 2 to 7 are stacked in the direction of their thickness between the stop 13 of the blade support and the plate 14 so that the blades 2 and 7 which have the longest lengths are located outside of the other blades on either side thereof. The length of the slats is defined so that the total thickness of the stacked slats, at each point of the central axis (A, A '), roughly corresponds to the theoretical shape that an equivalent solid beam would have, in same material as that of the blades and of equal resistance, embedded at one end and loaded at the other end. By analogy to a homogeneous beam, if h denotes the thickness of the beam, at a point located at a distance x from the opposite end to the embedded end, a simplified calculation of resistance of the materials shows that the thickness of the beam is proportional to the square root of the distance x according to the relation h = A
Figure imgb0001
 (1)

Suivant le mode de réalisation de l'antenne de la figure 1, le nombre de lames constituant l'antenne 1 va croissant au fur et à mesure que l'on s'éloigne de l'extrémité de l'antenne opposée à l'embout de connexion. Les transitions du nombre de lames le long de l'axe longitudinal de l'antenne apparaissent aux points P à P5 de la figure 1. Ainsi au point Po situé à l'extrémité opposée de l'embout de connexion l'antenne comporte une lame, et au point P,, situé à gauche du point Po, l'antenne comporte deux lames à gauche et une lame à droite. Au point P2 intermédiaire entre le point P3 et le point P1 l'antenne comporte trois lames à gauche et deux lames à droite. De même, aux points P3, P4 et P5, le nombre de lames situées à gauche de ces points est respectivement de 4, 5 et 6 lames. Le nombre N de lames situées au niveau de l'embout est naturellement fonction des contraintes appliquées aux sections des lames situées à l'endroit de cet embout, de la résistance mécanique des lames utilisées et de l'épaisseur de celles-ci. Si N désigne le nombre de lames situées au niveau de l'embout, et e l'épaisseur d'une lame, le produit N.e est, selon la formule (1) précédente, proprotionnel à la racine carrée de la longueur L de l'antenne. De même, si n désigne le nombre de lames situées à droite d'un point intermédiaire de transition, le produit du nombre n par l'épaisseur e d'une lame doit être également proportionnel selon la formule (1) précédente à la racine carrée de la distance entre le point intermédiaire considéré et l'extrémité opposée à l'embout de connexion. On en déduit que le quotient du nombre N par le nombre n de lames se trouve égal à la racine carrée de la longueur de l'antenne divisée par la distance x séparant un point intermédiaire de l'extrémité opposée à l'embout de connexion. La distance x séparant un point de transition de l'extrémité opposée à l'embout de connexion est par suite déterminée par la formule

Figure imgb0002
(2). Comme la longueur d'une lame est approximativement égale à la longueur L de l'antenne retranchée de la distance x séparant l'extrémité de la lame de l'extrémité de l'antenne, la longueur d'une lame est déterminée par la relation
Figure imgb0003
 According to the embodiment of the antenna of FIG. 1, the number of blades constituting the antenna 1 increases as the distance from the end of the antenna opposite to the end piece increases of connection. The transitions of the number of blades along the longitudinal axis of the antenna appear at points P to P 5 of FIG. 1. Thus at point P o situated at the opposite end of the connection end piece, the antenna comprises a blade, and at point P ,, located to the left of point P o , the antenna has two blades on the left and a blade on the right. At point P 2 intermediate between point P 3 and point P 1, the antenna has three blades on the left and two blades on the right. Similarly, at points P 3 , P 4 and P5, the number of blades located to the left of these points is 4, 5 and 6 blades respectively. The number N of blades located at the tip is naturally a function of the stresses applied to the sections of the blades located at the location of this tip, the mechanical strength of the blades used and the thickness of these. If N denotes the number of blades located at the tip, and e the thickness of a blade, the product Ne is, according to formula (1) above, proportional to the square root of the length L of the antenna. Similarly, if n denotes the number of blades located to the right of an intermediate transition point, the product of the number n by the thickness e of a blade must also be proportional according to formula (1) above to the square root the distance between the intermediate point considered and the end opposite the connection end piece. We deduce that the quotient of the number N by the number n of blades is equal to the square root of the length of the antenna divided by the distance x separating an intermediate point from the end opposite the connection end-piece. The distance x separating a transition point from the end opposite to the connection end piece is therefore determined by the formula
Figure imgb0002
 (2). As the length of a blade is approximately equal to the length L of the antenna subtracted from the distance x separating the end of the blade from the end of the antenna, the length of a blade is determined by the relationship
Figure imgb0003

Le maintien des lames entre elles est assuré par un dispositif isolant 17 en élastomère ou en matière plastique thermo durcissable formant une gaine diélectrique isolante entourant l'ensemble des lames et recouvrant également, si nécessaire, le support de lame 16 pour améliorer sa robustesse, ou composé de passants métalliques ou isolants non représentés, répartis régulièrement le long des lames et fixés chacun sur une seule lame extérieure. La gaine mécanique 17 a aussi pour rôle d'améliorer le contact à la main, de diminuer le bruit acoustique de l'antenne, d'amortir les vibrations mécaniques qui peuvent se produire lorsque l'antenne est soumise à un choc.The blades are held together by an insulating device 17 made of elastomer or thermosetting plastic forming an insulating dielectric sheath surrounding the assembly of the blades and also covering, if necessary, the blade support 16 to improve its robustness, or composed of metal or insulating loops not shown, distributed regularly along the boards and each fixed on a single outer board. The mechanical sheath 17 also has the role of improving the contact by hand, of reducing the acoustic noise of the antenna, of damping the mechanical vibrations which can occur when the antenna is subjected to a shock.

Pour augmenter les qualités électriques de l'antenne à très haute fréquence, les deux grandes lames extérieures 2 et 7 pourront être cuivrées avec un revêtement adapté à la fréquence de l'onde électromagnétique rayonnée par l'antenne. Dans ce dernier mode de réalisation où le courant haute fréquence circule uniquement sur la surface extérieure des lames extérieures, les lames intérieures pourront être réalisées dans un matériau isolant, par exemple, en une matière plastique suffisamment résiliante, souple et robuste ou un élastomère. De façon à faciliter le ; glissement des lames les unes par rapport aux autres,lorsque l'antenne est fléchie sur elle-même, un graissage des lames intérieures pourra être effectué. Egalement pour faciliter le centrage des lames les unes par rapport aux autres, et augmenter la raideur de l'ensemble, tout en lui conservant une grande souplesse au pliage devant les obstacles, chaque lame pourra être légèrement courbée dans le sens de la largeur comme cela est représenté sur la coupe de la figure 2, qui montre l'assemblage des lames 2, 3 et 7. Ce mode de réalisation permet en effet à l'antenne de se plier toujours de façon à présenter à l'obstacle sa face la plus souple et de présenter une meilleure érection après le passage de l'obstacle.To increase the electrical qualities of the very high frequency antenna, the two large outer blades 2 and 7 may be copper-coated with a coating adapted to the frequency of the electromagnetic wave radiated by the antenna. In the latter embodiment where the high frequency current flows only on the outer surface of the outer blades, the inner blades can be made of an insulating material, for example, a sufficiently resilient, flexible and robust plastic or an elastomer. In order to facilitate the; sliding of the blades relative to each other, when the antenna is bent on itself, a lubrication of the interior blades can be carried out. Also to facilitate the centering of the blades with respect to each other, and to increase the stiffness of the assembly, while retaining great flexibility in bending it in front of obstacles, each blade may be slightly curved in the width direction like this. is shown in the section of Figure 2, which shows the assembly of the blades 2, 3 and 7. This embodiment in fact allows the antenna to always bend so as to present the obstacle with its most opposite face flexible and present a better erection after the passage of the obstacle.

Bien que les principes de la présente invention aient été décrits ci-dessus en relation avec un exemple particulier de réalisation, il faut comprendre que la description n'a été faite qu'à titre d'exemple et n'en limite pas la portée de l'invention.Although the principles of the present invention have been described above in relation to a particular embodiment, it should be understood that the description has been given by way of example and does not limit the scope of it. the invention.

Claims (10)

1. Antenne courte pour émetteur-récepteur d'ondes électromagnétiques portable comprenant plusieurs lames (2, 3, 4, 5, 6, 7), à peu près planes, de longueurs différentes, ayant des grands axes à peu près parallèles entre eux et situés dans un même plan perpendiculaire aux faces des lames, les lames étant empilées dans le sens de leur épaisseur et fixées par une de leurs extrémités à un même embout de connexion (1), caractérisée en ce que la longueur des lames est déterminée pour que l'épaisseur (h) totale des lames empilées en un point quelconque soit à peu près proprotionnelle à la racine carrée de la distance séparant ce point, de l'extrémité (P ) de l'antenne opposée à l'embout de connexion et en ce que le maintien des lames entre elles est assuré par un dispositif (17) entourant tout ou partie de l'antenne à l'intérieur duquel les lames peuvent coulisser.1. Short antenna for portable electromagnetic wave transceiver comprising several blades (2, 3, 4, 5, 6, 7), roughly flat, of different lengths, having major axes roughly parallel to each other and located in the same plane perpendicular to the faces of the blades, the blades being stacked in the direction of their thickness and fixed by one of their ends to the same connection end piece (1), characterized in that the length of the blades is determined so that the total thickness (h) of the blades stacked at any point is approximately proportional to the square root of the distance separating this point, from the end (P) of the antenna opposite to the connection end piece and that the blades are held together by a device (17) surrounding all or part of the antenna inside which the blades can slide. 2. Antenne selon la revendication 1, caractérisée en ce que les lames extérieures (2, 7) ont les longueurs les plus grandes.2. Antenna according to claim 1, characterized in that the outer blades (2, 7) have the greatest lengths. 3. Antenne selon l'une quelconque des revendications 1 à 2, caractérisée en ce que les lames ont toutes la même épaisseur.3. An antenna according to any one of claims 1 to 2, characterized in that the blades all have the same thickness. 4. Antenne selon l'une quelconque des revendications 1 à 3, caractérisée en ce que la longueur d'une lame est à peu près déterminée 2 en fonction de son niveau d'empilement par la relation 1 = L (1-(N) ) où L désigne la longueur de l'antenne, N désigne le nombre de lames juxtaposées au niveau de l'embout de connexion, et n désigne le nombre de lames empilées entre l'extrémité de la lame considérée et l'extrémité de l'antenne opposée à l'embout de connexion.4. Antenna according to any one of claims 1 to 3, characterized in that the length of a blade is roughly determined 2 as a function of its stacking level by the relation 1 = L (1- (N) ) where L denotes the length of the antenna, N denotes the number of blades juxtaposed at the connection end piece, and n denotes the number of blades stacked between the end of the blade considered and the end of the antenna opposite to the connection end piece. 5. Antenne selon l'une quelconque des revendications 1 à 4, caractérisée en ce que les lames extérieures (2, 7) ont un revêtement en cuivre.5. An antenna according to any one of claims 1 to 4, characterized in that the outer blades (2, 7) have a copper coating. 6. Antenne selon l'une quelconque des revendications 1 à 3, caractérisée en ce que les lames intérieures sont en acier.6. An antenna according to any one of claims 1 to 3, characterized in that the inner blades are made of steel. 7. Antenne selon l'une quelconque des revendications 1 à 5, caractérisée en ce que les lames intérieures sont en matière électriquement isolante.7. Antenna according to any one of claims 1 to 5, characterized in that the inner blades are made of electrically insulating material. 8. Antenne selon l'une quelconque des revendications 1 à 7, caractérisée en ce que le dispositif pour le maintien des lames entre elles, est en matière non conductrice de l'électricité.8. An antenna according to any one of claims 1 to 7, characterized in that the device for holding the blades together is made of non-electrically conductive material. 9. Antenne selon l'une quelconque des revendications 1 à 7, caractérisée en ce que le dispositif pour le maintien des lames entre elles est constitué par des passants métalliques ou isolants fixés chacun sur une seule lame extérieure.9. Antenna according to any one of claims 1 to 7, characterized in that the device for holding the blades between them is constituted by metallic or insulating loops each fixed on a single outer blade. 10. Antenne selon l'une quelconque des revendications 1 à 9, caractérisée en ce que les lames intérieures sont lubrifiées.10. Antenna according to any one of claims 1 to 9, characterized in that the inner blades are lubricated.
EP82402265A 1981-12-18 1982-12-10 Short radiowave antenna for a portable transmitter-receiver Withdrawn EP0083262A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8123732A FR2518825A1 (en) 1981-12-18 1981-12-18 SHORT ANTENNA FOR PORTABLE ELECTROMAGNETIC WAVE TRANSMITTER-RECEIVER
FR8123732 1981-12-18

Publications (1)

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EP0083262A1 true EP0083262A1 (en) 1983-07-06

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Application Number Title Priority Date Filing Date
EP82402265A Withdrawn EP0083262A1 (en) 1981-12-18 1982-12-10 Short radiowave antenna for a portable transmitter-receiver

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EP (1) EP0083262A1 (en)
AR (1) AR229196A1 (en)
FR (1) FR2518825A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8436781B1 (en) * 2009-10-08 2013-05-07 R.A. Miller Industries, Inc. Whip antenna assembly with lift cable

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR868768A (en) * 1940-02-17 1942-01-15 Antenna system
US2293429A (en) * 1940-02-09 1942-08-18 Telefunken Gmbh Short-wave aerial
GB583409A (en) * 1945-05-07 1946-12-17 Charles William Eggleton Improvements in or relating to aerials
CA526629A (en) * 1956-06-19 Ultra Electric Limited Collapsible aerials
FR1149648A (en) * 1955-07-14 1957-12-30 Columbia Products Co Antenna without guy wire
FR2158492A1 (en) * 1971-11-03 1973-06-15 Int Standard Electric Corp

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA526629A (en) * 1956-06-19 Ultra Electric Limited Collapsible aerials
US2293429A (en) * 1940-02-09 1942-08-18 Telefunken Gmbh Short-wave aerial
FR868768A (en) * 1940-02-17 1942-01-15 Antenna system
GB583409A (en) * 1945-05-07 1946-12-17 Charles William Eggleton Improvements in or relating to aerials
FR1149648A (en) * 1955-07-14 1957-12-30 Columbia Products Co Antenna without guy wire
FR2158492A1 (en) * 1971-11-03 1973-06-15 Int Standard Electric Corp

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8436781B1 (en) * 2009-10-08 2013-05-07 R.A. Miller Industries, Inc. Whip antenna assembly with lift cable

Also Published As

Publication number Publication date
FR2518825A1 (en) 1983-06-24
AR229196A1 (en) 1983-06-30
FR2518825B1 (en) 1985-05-24

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