EP0929914B1 - Hochfrequenzantenne - Google Patents

Hochfrequenzantenne Download PDF

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Publication number
EP0929914B1
EP0929914B1 EP97919128A EP97919128A EP0929914B1 EP 0929914 B1 EP0929914 B1 EP 0929914B1 EP 97919128 A EP97919128 A EP 97919128A EP 97919128 A EP97919128 A EP 97919128A EP 0929914 B1 EP0929914 B1 EP 0929914B1
Authority
EP
European Patent Office
Prior art keywords
plate
antenna
wings
base
frequency antenna
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
EP97919128A
Other languages
English (en)
French (fr)
Other versions
EP0929914A1 (de
Inventor
Simon Azot
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.)
Telediffusion de France ets Public de Diffusion
Original Assignee
Telediffusion de France ets Public de Diffusion
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Filing date
Publication date
Application filed by Telediffusion de France ets Public de Diffusion filed Critical Telediffusion de France ets Public de Diffusion
Publication of EP0929914A1 publication Critical patent/EP0929914A1/de
Application granted granted Critical
Publication of EP0929914B1 publication Critical patent/EP0929914B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • H01Q9/30—Resonant antennas with feed to end of elongated active element, e.g. unipole
    • H01Q9/40—Element having extended radiating surface
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/44—Details of, or arrangements associated with, antennas using equipment having another main function to serve additionally as an antenna, e.g. means for giving an antenna an aesthetic aspect

Definitions

  • the present invention relates to an antenna with high frequency broadband. More particularly, it is fixed to the bodywork of a vehicle as a receiving antenna in FM sound broadcasting.
  • Such a known antenna is of the "whip" or "end of wire” type consisting of a substantially vertical conductive strand.
  • the horizontal directivity diagram is theoretically circular, and the antenna is almost omnidirectional if it is placed correctly on the vehicle, without being too disturbed by the body of the latter.
  • the "whip" antenna with its image in the mirror formed by the vehicle body behaves like a doublet.
  • the vertical directivity diagram consists of two substantially semicircular lobes like ears, symmetrical with respect to the vertical axis of the antenna, tangent to this axis at the foot of the antenna and located above the horizontal formed by the vehicle body.
  • the power picked up by the "whip” antenna thus extends in an elevated sector from 40 ° to 50 ° from the horizontal.
  • the sources emitting the sound broadcasting signals are very directive to radiate a few meters from the ground.
  • the "whip” antenna then picks up only a small useful power, due to the low vertical directivity of the antenna, and is largely subject to parasites, all the more since it has a consequent vertical secondary lobe along the axis of the antenna.
  • FIG. 11 discloses an antenna with a four-wing structure formed by two rectangular plates crossed perpendicular to each other. Each wing is a rectangle and the four wings have one long side in common.
  • the antenna is supplied at the central base of the wings by a central conductor of coaxial line.
  • This antenna with four rectangular wings is almost omnidirectional in a horizontal plane, that is to say in a plane perpendicular to the side common to the wings.
  • this antenna with four rectangular wings has two main lobes which are clearly raised relative to the horizontal, as well as small lobes secondary around the vertical axis of the antenna combined with the side common to the wings.
  • the present invention aims to remedy the disadvantages of the vertical directivity diagram of the above-mentioned known antennas by providing a high frequency antenna which in a vertical plane is very directive almost horizontally, that is to say almost following directions perpendicular to the antenna axis, while retaining the almost omnidirectional character in a horizontal plane.
  • a high frequency antenna with a structure with four wings is characterized in that each wing has a contour substantially in a right triangle, and the contours of the wings have in common a side of a right angle.
  • This structure gives the antenna a very marked directivity almost perpendicular to its axis, that is to say on the side of common right angle, and therefore in directions substantially parallel to the horizontal when the antenna is vertical.
  • the antenna is almost omnidirectional in a plane almost perpendicular to the axis of the antenna.
  • the right angle vertices of the wings are connected to a foot of the antenna collecting the radiated power received towards an appropriate receiver on board a vehicle.
  • the wings of the antenna are preferably substantially identical, although they may be somewhat different in particular as regards their contours without significantly modifying the performance of the antenna.
  • the length of the common right angle side of the antenna is between 4 to 6 lengths of the other right angle side of each wing, for reception frequencies of the order of gigahertz.
  • the wings of the antenna can form between them two by two an angle substantially between 80 and 90 °, without significantly modifying the quasi-omnidirectional character of the antenna.
  • the antenna can be manufactured from first and second plates substantially in an isosceles triangle, each forming two pairs of opposite wings.
  • the two plates can be split to assemble.
  • the first plate of the antenna has a slot which extends substantially along the half-height coming from the base of the first plate, from the top of the first plate, and into which a portion is inserted.
  • the second plate extending substantially along the half-height of the base of the second plate, from the top of the second plate, and the second plate has a slot which extends substantially along the half-height from the base of the second plate, from the middle of the base of the second plate, and into which is inserted a portion of the first plate extending substantially along the half-height of the base of the first plate, from the middle of the base of the first plate.
  • a high frequency broadband antenna 1 has a structure having four vertical flat wings 21, 22, 23 and 24, each having a contour in right triangle.
  • the wings have in common a large vertical right angle side 25 so that the short horizontal right angle sides of the wings are coplanar.
  • a threaded foot 3 At the common top of the right angles of the wings is fixed a threaded foot 3 to be screwed into a threaded sleeve secured to an antenna support, for example the body of a vehicle, in particular the roof of the latter.
  • the foot 3 is screwed into a removable magnetic base to be applied to the vehicle body.
  • the four wings are monolithic in pairs 21, 23 and 22, 24 formed in two brass metal plates 4 and 5 substantially identical and with an isosceles triangle outline.
  • the two plates are linked to each other to form a substantially right angle between them, between 80 ° and 90 °.
  • the first plate 4 has an upper slot 41 which extends substantially along the half-height coming from the base 42 of the first plate, from the top 43 of the first plate.
  • the second plate 5 has a lower slot 51 which extends substantially along the half-height coming from the base 52 of the second plate, from the middle of the base 52.
  • the width of the slots 41 and 51 is of the order of thickness of plates 4 and 5.
  • the second plate 5 is presented substantially at right angles above the apex 43 of the first plate 42 and then lowered along the base height of the first plate. Simultaneously and gradually, the portion of the second plate 5 extending substantially along the base half-height from the top 53 of the second plate, above the slot 51 is slid and contained in the slot 41 of the first plate, and the portion of the first plate 4 extending substantially along the base half-height from the middle of the first plate, below the slot 41, is slid and contained in the slot 51 of the second plate.
  • the plates are then glued or welded to each other along the right angle side common to the wings, that is to say along the base heights of the isosceles plates.
  • Two rectangular notches 44 and 54 formed in the middle of the bases 42 and 52 of the plates 4 and 5 delimit a cylindrical space so as to weld thereon a smooth end of the cylindrical base 3.
  • an antenna 1a according to the invention comprises two plates 4a and 5a which have an identical contour except for the respective assembly slots 41a and 51a along the right angle side common 25a and which each bring together two opposite wings 21a, 23a and 22a, 24a whose contours are different.
  • the wings 21a and 24a differ from the wings 22a and 23a by the profile of their hypotenuses, and differ from the wings in right triangle 21 to 24 by a longer short side of horizontal right angle.
  • the wings 21a and 24a each have a hypotenuse profile having two successive semicircular projections 25a, 26a.
  • the profile of the hypotenuse of the other two wings 22a and 23a has a projection 27a, 28a which extends substantially parallel to the hypotenuse of corresponding wings 22 and 23 and which is connected to the remaining two thirds of the hypotenuse and to the base of the plate by two convex fillets.
  • the profiles of the wings 21a, 24a and 23a, 22a in each of the plates 4a and 5a have an aesthetic appearance so as to read there the acronym DAB, the letter D being represented by the projection 28a, 27a, the letter A by the triangular apex isosceles 43a, 53a of plate 4a, 4b, and the letter B by the double projection 25a, 26a.
  • the dimensions of the antenna 1 are deduced from those of the antenna by extending it linearly the straight sections of the hypotenuses and bases from the wings of the antenna to their base.
  • FIGS. 10, 11 and 12 Three vertical directivity diagrams are shown in FIGS. 10, 11 and 12 respectively for azimuths A of 45 °, 180 ° and 270 ° marked around the axis 25a of the antenna from wing 21a, as shown in Figure 7, for several frequencies between 1482 and 1492 MHz.
  • the antenna 1a was located 1.42 meters from the ground on the roof of a vehicle and was used as a transmitting antenna at the center of a vertical semi-circular gantry for measuring electromagnetic power comprising a mobile receiving antenna capable of be moved in elevation from 0 to ⁇ 90 ° around the antenna la on either side of the vertical axis 25a thereof.
  • These vertical directivity diagrams are naturally valid for the antenna 1a used as a receiving antenna, by virtue of the principle of reciprocity of electromagnetic waves.
  • the major part of the ends of two main lobes comprised between attenuations of 0 and - 1 db extends substantially on either side of a site angle of 75 ° to 80 ° from the vertical over a width of plus or minus 5 to 10 °. Almost no secondary lobe appears in the center of the diagrams.
  • the antenna according to the invention is very directive in a direction almost perpendicular to the axis 25a of the antenna, that is to say an almost horizontal direction in practice, and is thus particularly intended to receive signals propagating near the ground.
  • the antenna according to the invention has an almost circular horizontal directivity diagram, and is therefore almost omnidirectional.
  • This horizontal directivity diagram is derived from the combination of two directivity diagrams of the pairs of wings 21a, 23a and 22a, 24a each comprising substantially two circles symmetrical with respect to the horizontal trace of the respective plate 4a, 5a and centered on the mediator of this trace, which mediator is confused with the trace of the other plate 5a, 4a when the plates 4a and 5a are perpendicular.

Landscapes

  • Details Of Aerials (AREA)

Claims (7)

  1. Hochfrequenzantenne mit vierflügeligem Aufbau, dadurch gekennzeichnet, daß jeder Flügel (21 bis 24) eine Kontur im wesentlichen eines rechtwinkligen Dreiecks aufweist und die Konturen der Flügel eine Kathete (25) gemeinsam haben.
  2. Hochfrequenzantenne nach Anspruch 1, bei der die Flügel (21 bis 24) im wesentlichen identisch sind.
  3. Hochfrequenzantenne nach Anspruch 1 oder 2, bei der die Länge der gemeinsamen Kathete (25) zwischen der 4- und 6-fachen Länge der anderen Kathete jedes Flügels ist.
  4. Hochfrequenzantenne nach einem beliebigen der Ansprüche 1 bis 3, bei der die Flügel (21 bis 24) paarweise miteinander einen Winkel im wesentlichen zwischen 80 und 90° bilden.
  5. Hochfrequenzantenne nach einem beliebigen der Ansprüche 1 bis 4, bei der die Spitzen der rechten Winkel der Flügel (21 bis 24) mit einem Fuß (3) der Antenne verbunden sind.
  6. Hochfrequenzantenne nach einem beliebigen der Ansprüche 1 bis 5, umfassend erste und zweite Platten (4, 5) als im wesentlichen gleichschenkeliges Dreieck, die jeweils zwei gegenüberliegende Flügelpaare (21, 23; 22, 24) bilden.
  7. Hochfrequenzantenne nach Anspruch 6, bei der
    die erste Platte (4) einen Schlitz (41) umfaßt, der sich im wesentlichen entlang der halben Ausgangshöhe der Basis (42) der ersten Platte, von der Spitze der ersten Platte aus, erstreckt, und in den ein Abschnitt der zweiten Platte (5) eingefügt ist, der sich im wesentlichen entlang der halben Höhe der Basis (52) der zweiten Platte, von der Spitze (53) der zweiten Platte aus, erstreckt, und
    die zweite Platte (5) einen Schlitz (51) umfaßt, der sich im wesentlichen entlang der halben Ausgangshöhe der Basis (52) der zweiten Platte, von der Mitte der Basis der zweiten Platte aus, erstreckt, und in den ein Abschnitt der ersten Platte (4) eingefügt ist, der sich im wesentlichen entlang der halben Höhe der Basis (42) der ersten Platte, von der Mitte der Basis der ersten Platte aus, erstreckt.
EP97919128A 1996-10-02 1997-09-18 Hochfrequenzantenne Expired - Lifetime EP0929914B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9612165 1996-10-02
FR9612165A FR2754109B1 (fr) 1996-10-02 1996-10-02 Antenne a haute frequence
PCT/FR1997/001654 WO1998015032A1 (fr) 1996-10-02 1997-09-18 Antenne a haute frequence

Publications (2)

Publication Number Publication Date
EP0929914A1 EP0929914A1 (de) 1999-07-21
EP0929914B1 true EP0929914B1 (de) 2002-05-22

Family

ID=9496397

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97919128A Expired - Lifetime EP0929914B1 (de) 1996-10-02 1997-09-18 Hochfrequenzantenne

Country Status (5)

Country Link
EP (1) EP0929914B1 (de)
DE (1) DE69712769T2 (de)
ES (1) ES2173440T3 (de)
FR (1) FR2754109B1 (de)
WO (1) WO1998015032A1 (de)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI990396A (fi) * 1999-02-24 2000-08-25 Nokia Networks Oy Antennisäteilijä
WO2005006488A1 (en) * 2003-07-10 2005-01-20 Upm-Kymmene Corporation Planar antenna
KR100846487B1 (ko) * 2003-12-08 2008-07-17 삼성전자주식회사 등방향성 방사패턴을 갖는 초광대역 안테나
US20060164307A1 (en) * 2005-01-26 2006-07-27 Innerwireless, Inc. Low profile antenna
US7408521B2 (en) 2006-04-12 2008-08-05 Innerwireless, Inc. Low profile bicone antenna

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1658761A (en) * 1926-06-07 1928-02-07 Joseph F Crance Radioantenna
GB712265A (en) * 1952-02-14 1954-07-21 Nat Res Dev Improvements in or relating to aerials
US3050730A (en) * 1959-07-09 1962-08-21 Sylvania Electric Prod Broadband plate antenna

Also Published As

Publication number Publication date
DE69712769T2 (de) 2002-11-07
ES2173440T3 (es) 2002-10-16
FR2754109B1 (fr) 1998-11-13
FR2754109A1 (fr) 1998-04-03
EP0929914A1 (de) 1999-07-21
DE69712769D1 (de) 2002-06-27
WO1998015032A1 (fr) 1998-04-09

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