EP0116487B1 - Ground Plane Antenne - Google Patents

Ground Plane Antenne Download PDF

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Publication number
EP0116487B1
EP0116487B1 EP19840400038 EP84400038A EP0116487B1 EP 0116487 B1 EP0116487 B1 EP 0116487B1 EP 19840400038 EP19840400038 EP 19840400038 EP 84400038 A EP84400038 A EP 84400038A EP 0116487 B1 EP0116487 B1 EP 0116487B1
Authority
EP
European Patent Office
Prior art keywords
length
aerial
hundred
whip
order
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
Application number
EP19840400038
Other languages
English (en)
French (fr)
Other versions
EP0116487A1 (de
Inventor
Frédéric Ngo Bui Hung
Yves Foissac
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.)
Laboratoire D'etudes Et De Recherches Chimiques Lerc Sa
Original Assignee
Laboratoire D'etudes Et De Recherches Chimiques Lerc 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 Laboratoire D'etudes Et De Recherches Chimiques Lerc Sa filed Critical Laboratoire D'etudes Et De Recherches Chimiques Lerc Sa
Publication of EP0116487A1 publication Critical patent/EP0116487A1/de
Application granted granted Critical
Publication of EP0116487B1 publication Critical patent/EP0116487B1/de
Expired legal-status Critical Current

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Classifications

    • 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
    • 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
    • H01Q9/32—Vertical arrangement of element
    • H01Q9/38—Vertical arrangement of element with counterpoise

Definitions

  • the invention relates to a ground plane antenna, for fixed or semi-mobile station, covering a frequency band greater than one octave for a standing wave rate at most equal to three. It applies in particular to stations working in the old and new very high frequency bands for military use, ranging from twenty six to seventy six megahertz and from thirty to eighty eight megahertz respectively.
  • antennas with an artificial ground plane comprising a radiating strand or "whip" having, with respect to the wave of the useful frequency, a length of the order of a quarter wave, so that in combination with its image reflected by the artificial ground and which forms a fictitious radiating strand, it realizes an antenna equivalent to a conventional half-wave.
  • This antenna already appreciated for the fact that it is not directive, is also advantageous in that it is favorable to distant links because it radiates at an angle close to the horizontal.
  • this artificial soil currently consists of three or four horizontal or inclined conductors connected together at the foot of the whip towards which they converge.
  • this length of the counterweights is in itself unanimously considered by those skilled in the art to be in no way critical.
  • the ratio is of fifty.
  • a result which the invention aims to obtain is an antenna of the type cited above, having radioelectric qualities optimized throughout the wide frequency band where it is intended to operate without being bulky and without requiring either a tuning box , nor resistive loads.
  • the counterweights have a length of between one hundred and forty and one hundred and eighty percent of the length of the whip.
  • the counterweights 4, 5, 6 like the whip 2 can be of any known type and in particular can be dismantled and / or be produced in one or more sections 7, 8, 9 of short length to facilitate transport.
  • this antenna 1 is coupled directly or by any known means, such as a system 10 transformer of impedance in a determined ratio, in order to adapt the characteristic impedance of the antenna 1 to that of said transmission line or as a broadband coupler (not shown) of the type capable of constituting a network having a defined diagram.
  • any known means such as a system 10 transformer of impedance in a determined ratio, in order to adapt the characteristic impedance of the antenna 1 to that of said transmission line or as a broadband coupler (not shown) of the type capable of constituting a network having a defined diagram.
  • this antenna works like a dipole with two radiating strands, one real constituted by the whip the other fictitious constituted by its image reflected by ground plane.
  • the fictitious radiating strand of the antenna has a length which is between one hundred and forty and one hundred and eighty percent of the length of the actual radiating strand.
  • counterweights 4, 5, 6 which have a length KL of between one hundred and forty and one hundred and eighty percent of the length of the whip 2 and preferably equal to one hundred sixty percent of that length of the whip.
  • the whips and counterweights will be respectively one thousand eight hundred and two thousand nine hundred millimeters long in the old band (twenty six to seventy sixteen megahertz) or one thousand six hundred and two thousand five one hundred millimeters in the new band (thirty to eighty eight megahertz).
  • the counterweights 4, 5, 6 each form with the whip 2 an angle of the order of one hundred and thirty five degrees and are three in number.
  • the inventors have in fact found that with such an asymmetrical antenna in such proportions, the variation in the resistance to radiation is much smaller than with a symmetrical dipole or a conventional ground plane antenna whose counterweights have lengths equal to that of the whip. Indeed, with this proportion of asymmetry between the radiating strands, always for a variation in the number of waves between eleven tenths and thirty three tenths of waves between the maximum radiation resistance which is four hundred ohms and the resistance to minimum radiation which is fifty ohms, the ratio is now eight instead of fifty.
  • the asymmetrical antenna in the aforementioned characteristic ratio is, for a standing wave rate less than three, directly adapted, in a frequency band of more than one octave, to a characteristic impedance transmission line. one hundred and thirty five ohms.
  • this antenna can of course be adapted to any other characteristic impedance of the line.
  • the antenna thus obtained can obviously be combined with at least one other antenna by a coupler.

Landscapes

  • Details Of Aerials (AREA)

Claims (7)

1. Ground plane-Antenne mit einerseits einem strahlenden Leiter oder einer "Peitsche" (2) mit einer vorherbestimmten Länge (L) und andererseits mit Leitern als "Gegengewicht" (4, 5, 6), die zur Bildung der Ground plane alle dieselbe Länge (KL) aufweisen und alle mit der Peitsche (2) einen gleichen Winkel zum Fuß bilden, zu dem sie konvergieren und zwischen sich allen gleiche Winkel bilden, wobei die Antenne dadurch gekennzeichnet ist, daß die Gegengewichte (4, 5, 6) eine Länge (KL) zwischen 140 und 180 % der Länge (L) der Peitsche (2) aufweisen.
2. Antenne nach Anspruch 1, dadurch gekennzeichnet, daß die Länge (KL) 160 % der Länge (L) der Länge der Peitsche entspricht.
3. Antenne nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Winkel (a) , den die Gegengewichte (4, 5, 6) mit der Peitsche (2) bilden, in der Größenordnung von 135° liegt.
4. Antenne nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß drei Leiter als Gegengewichte vorgesehen sind.
5. Antenne nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die Länge (L) des strahlenden Leiters (2) in der Größenordnung eines Viertels der Wellenlänge der mittleren Frequenz des Frequenzbandes liegt, in dem die Antenne benutzt werden soll.
6. Antenne nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß sie mit einem Impedanzwandler für ein Breitband zum Transformieren der charakteristischen Impedanz der Antenne kombiniert ist, um ihr die charakteristische Impedanz der Speiseleitung zuzuführen.
7. Antenne nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß sie zumindest mit einer weiteren dieser Antennen mit einem Breitbandstecker zur Bildung eines Netzes kombiniert ist, welches ein definiertes Diagramm bildet.
EP19840400038 1983-01-13 1984-01-09 Ground Plane Antenne Expired EP0116487B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8300736A FR2539557B3 (fr) 1983-01-13 1983-01-13 Antenne a large bande
FR8300736 1983-01-13

Publications (2)

Publication Number Publication Date
EP0116487A1 EP0116487A1 (de) 1984-08-22
EP0116487B1 true EP0116487B1 (de) 1988-09-21

Family

ID=9285049

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19840400038 Expired EP0116487B1 (de) 1983-01-13 1984-01-09 Ground Plane Antenne

Country Status (3)

Country Link
EP (1) EP0116487B1 (de)
DE (1) DE3474238D1 (de)
FR (1) FR2539557B3 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE9702429D0 (sv) * 1997-06-25 1997-06-25 Ericsson Telefon Ab L M Retractable tripod antenna
FR2783097A1 (fr) * 1998-09-04 2000-03-10 Alain Leseine Antenne d'emission reception d'ondes radio a polarisation verticale a angle d'elevation du lobe de rayonnement variable

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL46868C (de) * 1936-01-03
US2275646A (en) * 1939-07-18 1942-03-10 Rca Corp Antenna
US2425585A (en) * 1943-12-13 1947-08-12 Hazeltine Research Inc Wave-signal antenna
US2704811A (en) * 1950-06-19 1955-03-22 Andrew W Walters Cylindrical antenna
US3656167A (en) * 1969-11-25 1972-04-11 Plessey Co Ltd Dipole radio antennae

Also Published As

Publication number Publication date
FR2539557B3 (fr) 1985-12-20
DE3474238D1 (de) 1988-10-27
EP0116487A1 (de) 1984-08-22
FR2539557A1 (fr) 1984-07-20

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