EP1500163B1 - Passive tunable broadband antenna - Google Patents

Passive tunable broadband antenna Download PDF

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Publication number
EP1500163B1
EP1500163B1 EP03747473A EP03747473A EP1500163B1 EP 1500163 B1 EP1500163 B1 EP 1500163B1 EP 03747473 A EP03747473 A EP 03747473A EP 03747473 A EP03747473 A EP 03747473A EP 1500163 B1 EP1500163 B1 EP 1500163B1
Authority
EP
European Patent Office
Prior art keywords
inductors
antenna
toroids
antenna according
spaces
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP03747473A
Other languages
German (de)
French (fr)
Other versions
EP1500163A2 (en
Inventor
Ronald Craig Davidson
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.)
Cobham Aerospace Communications Dourdan SA
Original Assignee
Chelton Antennas SA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Chelton Antennas SA filed Critical Chelton Antennas SA
Publication of EP1500163A2 publication Critical patent/EP1500163A2/en
Application granted granted Critical
Publication of EP1500163B1 publication Critical patent/EP1500163B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H01Q9/06—Details
    • H01Q9/14—Length of element or elements adjustable
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q11/00—Electrically-long antennas having dimensions more than twice the shortest operating wavelength and consisting of conductive active radiating elements
    • H01Q11/02—Non-resonant antennas, e.g. travelling-wave antenna
    • H01Q11/08—Helical antennas

Definitions

  • the invention relates to a connectable antenna passive broadband.
  • An object of the invention is notably to provide an antenna adapted to operate in a range also range than the 30-512 MHz range.
  • a solution would consist of using at least two antennas of very different lengths, typically an antenna 2.5m tuned to 30MHz and a 15cm antenna tuned at 512MHz, preferably to a single antenna whose radiation pattern could not be satisfying at the same time for these two frequencies.
  • a frequently proposed solution is to use a radiating element consisting of several connected series of inductances and to provide to short-circuit the inductors individually and on demand (see for example US 4,564,843, US 4,656 483, US 4,862,184, US 4,924,238, US 6,169,523), which allows to tune the antenna to different frequencies according to the number of elements short-circuited.
  • An object of the present invention is to provide a an antenna whose selectivity is satisfactory in a very wide range of operating frequencies.
  • an antenna which comprises a radiating element consisting of several series-connected inductors and which includes means to short-circuit the inductors individually and on demand, characterized in that the antenna comprises also means to interrupt the link between any two successive inductances, in that each inductor is designed to delimit a space surrounded by the inductor and in which is circumscribed the magnetic field generated by the passage of a current in the inductance, in that the inductances are arranged so that these spaces are superimposed, and in that the means for shorting the inductances and means to interrupt the links between the inductors include switches arranged near the inductors and connected to control means placed remotely via electrical conductors crossing superimposed spaces.
  • the drivers are passed through a metal tube in the center of these spaces.
  • the inductances are constituted by toroids whose own resonance frequency is chosen to be higher than the highest frequency of operation of the antenna.
  • the present invention therefore makes it possible to the antenna over a wide range of frequencies and make vary its length according to the tuning frequency, so that the selectivity of the antenna is maintained at a high value.
  • the radiating element (1) of the antenna is constituted of toroids (Tn-1), (Tn), ... arranged horizontally.
  • the toroids have any shape (in a circle, in polygon, square, triangle, etc.) provided that the magnetic field generated by the passage of a current in the toroids is circumscribed to an area limited, which greatly reduces the inductance between the different toroids. All of the toroids is crossed by a metal tube (2) to inside which the drivers (3) who are connected by decoupling inductors (5) to switches that include switches such as (b) and (d) which are used to cut the toroids successive and switches such as (a) and (c) which serve to short-circuit the toroids individually.
  • the different toroids have frequencies of individual resonance identical or different but outside the operating band of the antenna.
  • the switches are made in this example and in a manner known in itself by capacitance-transistor couples (6,7) or by pairs of transistors opposite (8,9), depending on whether they are switches (b) and (d), or switches (a) and (c).
  • the invention is not limited to this example of production.

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  • Variable-Direction Aerials And Aerial Arrays (AREA)

Description

L'invention concerne une antenne raccordable passive à large bande.The invention relates to a connectable antenna passive broadband.

Un but de l'invention est notamment de fournir une antenne apte à fonctionner dans une gamme aussi étendue que la gamme 30-512 MHz.An object of the invention is notably to provide an antenna adapted to operate in a range also range than the 30-512 MHz range.

Pour couvrir une telle gamme, une solution consisterait à utiliser au moins deux antennes de longueurs très différentes, soit typiquement une antenne de 2,5m accordée à 30MHz et une antenne de 15cm accordée à 512MHz, de préférence à une antenne unique dont le diagramme de rayonnement ne pourrait pas être satisfaisant au même temps pour ces deux fréquences.To cover such a range, a solution would consist of using at least two antennas of very different lengths, typically an antenna 2.5m tuned to 30MHz and a 15cm antenna tuned at 512MHz, preferably to a single antenna whose radiation pattern could not be satisfying at the same time for these two frequencies.

Diverses solutions à antenne unique ont néanmoins été proposées pour constituer une antenne passive accordable à large bande.Various single antenna solutions nevertheless been proposed to constitute a passive antenna tunable broadband.

Une solution fréquemment proposée consiste à utiliser un élément rayonnant constitué de plusieurs inductances reliées en série et à prévoir des moyens pour court-circuiter les inductances individuellement et à la demande (cf. par exemple US 4 564 843, US 4 656 483, US 4 862 184, US 4 924 238, US 6 169 523), ce qui permet d'accorder l'antenne à différentes fréquences selon le nombre d'éléments court-circuités.A frequently proposed solution is to use a radiating element consisting of several connected series of inductances and to provide to short-circuit the inductors individually and on demand (see for example US 4,564,843, US 4,656 483, US 4,862,184, US 4,924,238, US 6,169,523), which allows to tune the antenna to different frequencies according to the number of elements short-circuited.

Cette solution permet d'obtenir une sélectivité élevée à la plus faible fréquence de fonctionnement mais cette sélectivité décroít lorsque la fréquence augmente.This solution makes it possible to obtain a selectivity raised to the lowest operating frequency but this selectivity decreases when the frequency increases.

Un but de la présente invention est de fournir une antenne dont la sélectivité soit satisfaisante dans une gamme très étendue de fréquences de fonctionnement. An object of the present invention is to provide a an antenna whose selectivity is satisfactory in a very wide range of operating frequencies.

On y parvient selon l'invention avec une antenne qui comprend un élément rayonnant constitué de plusieurs inductances reliées en série et qui comprend des moyens pour court-circuiter les inductances individuellement et à la demande, caractérisée en ce que l'antenne comprend également des moyens pour interrompre la liaison entre deux inductances successives quelconques, en ce que chaque inductance est conçue pour délimiter un espace entouré par l'inductance et dans lequel est circonscrit le champ magnétique engendré par le passage d'un courant dans l'inductance, en ce que les inductances sont disposées en sorte que ces espaces soient superposés, et en ce que les moyens pour court-circuiter les inductances et les moyens pour interrompre les liaisons entre les inductances comprennent des commutateurs disposés à proximité des inductances et reliés à des moyens de commande placés à distance par l'intermédiaire de conducteurs électriques qui traversent lesdits espaces superposés.It is achieved according to the invention with an antenna which comprises a radiating element consisting of several series-connected inductors and which includes means to short-circuit the inductors individually and on demand, characterized in that the antenna comprises also means to interrupt the link between any two successive inductances, in that each inductor is designed to delimit a space surrounded by the inductor and in which is circumscribed the magnetic field generated by the passage of a current in the inductance, in that the inductances are arranged so that these spaces are superimposed, and in that the means for shorting the inductances and means to interrupt the links between the inductors include switches arranged near the inductors and connected to control means placed remotely via electrical conductors crossing superimposed spaces.

De préférence, on fait passer les conducteurs dans un tube métallique au centre de ces espaces.Preferably, the drivers are passed through a metal tube in the center of these spaces.

De préférence, les inductances sont constituées par des toroïdes dont la fréquence de résonnance propre est choisie pour être supérieure à la plus haute fréquence de fonctionnement de l'antenne.Preferably, the inductances are constituted by toroids whose own resonance frequency is chosen to be higher than the highest frequency of operation of the antenna.

L'utilisation de toroïdes pour constituer un élément rayonnant d'une antenne est connue en soi (cf. par exemple les publications US 4 622 588 et US 5 422 369), mais aucune de ces publications ne prévoit d'utiliser une série de toroïdes pour réaliser une antenne accordable sur toute une gamme de fréquences. The use of toroids to constitute an element radiating antenna is known per se (see US Pat. Nos. 4,622,588 and 5,422,369), but none of these publications plans to use a series of toroids to make an antenna tunable over a range of frequencies.

La présente invention permet donc d'accorder l'antenne sur une large gamme de fréquences et de faire varier sa longueur en fonction de la fréquence d'accord, en sorte que la sélectivité de l'antenne soit maintenue à une valeur élevée.The present invention therefore makes it possible to the antenna over a wide range of frequencies and make vary its length according to the tuning frequency, so that the selectivity of the antenna is maintained at a high value.

Les figures du dessin joint sont des schémas d'un exemple d'une antenne conforme à l'invention dont on a représenté que deux éléments parmi tous les éléments qui constituent l'élément rayonnant de l'antenne :

  • la figure 1 est une vue dans un plan vertical où les inductances sont vues de côté.
  • la figure 2 est une vue analogue dans un plan vertical mais où les inductances ont été montrées en plan.
The figures of the attached drawing are diagrams of an example of an antenna according to the invention which has been shown as two elements among all the elements which constitute the radiating element of the antenna:
  • Figure 1 is a view in a vertical plane where the inductances are viewed from the side.
  • Figure 2 is a similar view in a vertical plane but where the inductors have been shown in plan.

L'élément rayonnant (1) de l'antenne est constitué de toroïdes (Tn-1), (Tn), ... disposés horizontalement. Les toroïdes ont une forme quelconque (en cercle, en polygone, en carré, en triangle, etc) pourvu que le champ magnétique engendré par le passage d'un courant électrique dans les toroïdes soit circonscrit à une aire limitée, ce qui réduit considérablement l'inductance mutuelle entre les différents toroïdes. L'ensemble des toroïdes est traversé par un tube métallique (2) à l'intérieur duquel passent les conducteurs (3) qui sont reliés par des inducteurs de découplage (5) aux commutateurs qui comprennent des commutateurs tels que (b) et (d) qui servent à découper les toroïdes successifs et des commutateurs tels que (a) et (c) qui servent à court-circuiter les toroïdes individuellement. The radiating element (1) of the antenna is constituted of toroids (Tn-1), (Tn), ... arranged horizontally. The toroids have any shape (in a circle, in polygon, square, triangle, etc.) provided that the magnetic field generated by the passage of a current in the toroids is circumscribed to an area limited, which greatly reduces the inductance between the different toroids. All of the toroids is crossed by a metal tube (2) to inside which the drivers (3) who are connected by decoupling inductors (5) to switches that include switches such as (b) and (d) which are used to cut the toroids successive and switches such as (a) and (c) which serve to short-circuit the toroids individually.

Les différents toroïdes ont des fréquences de résonnance individuelles identiques ou différentes, mais extérieurs à la bande de fonctionnemnt de l'antenne.The different toroids have frequencies of individual resonance identical or different but outside the operating band of the antenna.

On a schématisé sur les figures les moyens de commande des commutateurs par un rectangle (4).We have schematized in the figures the means of controlling switches by a rectangle (4).

Les commutateurs sont constitués dans cet exemple et de façon en soi connue par des couples capacité-transistor (6,7) ou par des couples de transistors opposés (8,9), selon qu'il s'agit des commutateurs (b) et (d), ou des commutateurs (a) et (c).The switches are made in this example and in a manner known in itself by capacitance-transistor couples (6,7) or by pairs of transistors opposite (8,9), depending on whether they are switches (b) and (d), or switches (a) and (c).

L'invention n'est pas limitée à cet exemple de réalisation.The invention is not limited to this example of production.

Claims (6)

  1. Wideband tunable antenna that includes a radiating element (1) comprising several inductors connected in series, and that includes means (a, c) of short circuiting the inductors individually and on demand, characterised in that the antenna also comprises means (b, d) for interrupting the link between any two successive inductors, in that each inductor is designed to limit a space surrounded by the inductor and circumscribing the magnetic field generated by a current passing through the inductor, in that the inductors are distributed in such a way that these spaces are superposed, and in that the means (a, c) for short circuiting the inductors and the means (b, d) for interrupting the links between the inductors include switches positioned near the inductors and linked to command means (4) placed remotely by electric conductors (3) that pass through the said superposed spaces.
  2. Antenna according to claim 1 that includes a metal tube (2) through which the said conductors (3) pass.
  3. Antenna according to claim 2, in which the said metal tube (2) passes through the centre of said spaces.
  4. Antenna according to claims 1 to 3, in which the inductors comprise toroids (T).
  5. Antenna according to claim 4 in which the shape plan of the toroids (T) is selected from the following shapes: circles, polygon, square, triangle.
  6. Antenna according to claim 4 or 5 in which the natural resonant frequency of the toroids (T) is selected to be greater than the highest operating frequency of the antenna.
EP03747473A 2002-04-29 2003-04-29 Passive tunable broadband antenna Expired - Lifetime EP1500163B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR0205349 2002-04-29
FR0205349A FR2839207B1 (en) 2002-04-29 2002-04-29 BROADBAND PASSIVE TUNABLE ANTENNA
PCT/FR2003/001341 WO2003094291A2 (en) 2002-04-29 2003-04-29 Passive tunable broadband antenna

Publications (2)

Publication Number Publication Date
EP1500163A2 EP1500163A2 (en) 2005-01-26
EP1500163B1 true EP1500163B1 (en) 2005-10-26

Family

ID=28800008

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03747473A Expired - Lifetime EP1500163B1 (en) 2002-04-29 2003-04-29 Passive tunable broadband antenna

Country Status (6)

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US (1) US20050200552A1 (en)
EP (1) EP1500163B1 (en)
AU (1) AU2003246871A1 (en)
DE (1) DE60302059T2 (en)
FR (1) FR2839207B1 (en)
WO (1) WO2003094291A2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10760414B1 (en) * 2019-07-12 2020-09-01 Isodrill, Inc. Data transmission system

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4924238A (en) * 1987-02-06 1990-05-08 George Ploussios Electronically tunable antenna
US6028558A (en) * 1992-12-15 2000-02-22 Van Voorhies; Kurt L. Toroidal antenna
US5870681A (en) * 1995-12-28 1999-02-09 Lucent Technologies, Inc. Self-steering antenna array
FR2759497A1 (en) * 1997-02-07 1998-08-14 Thomson Csf Variable geometry antenna for frequencies below 1GHz
FR2760900B1 (en) * 1997-03-17 1999-05-28 Centre Nat Etd Spatiales ANTENNA FOR SCROLL SATELLITE
US6337664B1 (en) * 1998-10-21 2002-01-08 Paul E. Mayes Tuning circuit for edge-loaded nested resonant radiators that provides switching among several wide frequency bands
US6169523B1 (en) * 1999-01-13 2001-01-02 George Ploussios Electronically tuned helix radiator choke
US6606075B1 (en) * 2001-06-07 2003-08-12 Luxul Corporation Modular wireless broadband antenna tower
US6664938B2 (en) * 2002-03-01 2003-12-16 Ems Technologies Canada, Ltd. Pentagonal helical antenna array

Also Published As

Publication number Publication date
AU2003246871A1 (en) 2003-11-17
WO2003094291A2 (en) 2003-11-13
EP1500163A2 (en) 2005-01-26
US20050200552A1 (en) 2005-09-15
DE60302059T2 (en) 2006-07-20
WO2003094291A3 (en) 2004-04-01
FR2839207A1 (en) 2003-10-31
DE60302059D1 (en) 2005-12-01
FR2839207B1 (en) 2004-07-16

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