EP0254373B1 - Antenne für hohe Frequenzen - Google Patents

Antenne für hohe Frequenzen Download PDF

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Publication number
EP0254373B1
EP0254373B1 EP87201401A EP87201401A EP0254373B1 EP 0254373 B1 EP0254373 B1 EP 0254373B1 EP 87201401 A EP87201401 A EP 87201401A EP 87201401 A EP87201401 A EP 87201401A EP 0254373 B1 EP0254373 B1 EP 0254373B1
Authority
EP
European Patent Office
Prior art keywords
antenna
frequency range
impedance
wire line
dipole
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
EP87201401A
Other languages
English (en)
French (fr)
Other versions
EP0254373A1 (de
Inventor
Pierre Société Civile S.P.I.D. Chanteau
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.)
Koninklijke Philips NV
Original Assignee
Philips Electronique Gran Public
Philips Gloeilampenfabrieken NV
Koninklijke Philips Electronics NV
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 Philips Electronique Gran Public, Philips Gloeilampenfabrieken NV, Koninklijke Philips Electronics NV filed Critical Philips Electronique Gran Public
Publication of EP0254373A1 publication Critical patent/EP0254373A1/de
Application granted granted Critical
Publication of EP0254373B1 publication Critical patent/EP0254373B1/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
    • H01Q9/16—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole
    • H01Q9/28—Conical, cylindrical, cage, strip, gauze, or like elements having an extended radiating surface; Elements comprising two conical surfaces having collinear axes and adjacent apices and fed by two-conductor transmission lines
    • 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
    • H01Q5/342—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes
    • H01Q5/357—Individual or coupled radiating elements, each element being fed in an unspecified way for different propagation modes using a single feed point
    • 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
    • H01Q5/40—Imbricated or interleaved structures; Combined or electromagnetically coupled arrangements, e.g. comprising two or more non-connected fed radiating elements
    • H01Q5/48—Combinations of two or more dipole type antennas

Definitions

  • the subject of the present invention is a reception antenna for receiving high frequency electromagnetic signals consisting of a biconical dipole full wave of impedance Z1 for the reception of a first frequency range, which dipole comprises two V-shaped unipoles , or U, located in the same plane on either side of an axis of symmetry, the bisector of the two V's being common and substantially perpendicular to said axis of symmetry, each unipole having a vertex and a characteristic length L1 related with a wavelength ⁇ 1 chosen from the wavelengths of said first frequency range.
  • Such antennas are in particular intended for the reception of television broadcasts.
  • Biconical dipoles are well known and described for example in the publication "Antenna Engineering Handbook” by Henry JASIK published by Mac Graw-Hill more particularly pages 3.11 and 3.12. This publication explains in particular that the impedance of the dipole varies as a function of the geometry of the dipole and the frequency of the electromagnetic signals so that a dipole of given dimensions can receive, satisfactorily, only one octave in frequency .
  • the object of the present invention is to enlarge the possibilities of reception of such an antenna.
  • the two-wire line functionally constitutes an antenna descent to conduct the signals available between the two vertices of the dipole to the free ends of the two-wire line
  • the two-wire line functionally forms part of the antenna itself; the antenna delivers the signals received at the free end of the two-wire line; an antenna according to the invention thus delivers signals corresponding to two frequency ranges.
  • said first frequency range being the UHF band
  • such an antenna is particularly remarkable in that the said second frequency range is the VHF band
  • the said doublet is a half-wave doublet ( ⁇ / 2)
  • such an antenna is capable of receiving UHF and VHF transmissions simultaneously; for domestic television reception applications in individuals, such a so-called mixed antenna is particularly practical because it is economical, easy to produce and takes up little space.
  • the impedance Z1 of the biconical dipole being practically equal to 300 ohms
  • a preferred embodiment is characterized in that the impedance Z′1 of the two-wire line substantially equal to the impedance Z1 of 300 ohms is obtained by two conductors each consisting of a sheet of ferrous metal having substantially 5 mm wide and 0.4 mm thick, the two sheets being placed face to face at a distance of about 20 mm from each other, symmetrically with respect to said axis of symmetry of the dipole.
  • This embodiment is more particularly economical.
  • an antenna according to the invention further comprising an output terminal (S) and a ground (M) for delivering the electrical signals received at an impedance substantially equal to 75 ohms whatever the frequency range considered, is particularly remarkable in that firstly for UHF reception, on the one hand a first free end of the two-wire line is connected directly to said output terminal while, on the other hand, the second free end of the two-wire line is connected to the same output terminal via a balun and an impedance transformer (SYTR) of ratio 4, secondly for VHF reception, on the one hand said output terminal is isolated from the balun to by means of a high-pass filter, on the other hand the second free end of the two-wire line is connected to said mass by means of a low-pass filter.
  • SYTR impedance transformer
  • the coaxial antenna down cable is adapted in impedance, substantially 75 ohms, both in UHF and in VHF.
  • the present invention has in particular been designed for the UHF and VHF bands but it is clear that by suitably modifying the dimensions of the dipole and of the two-wire line, an antenna adapted to other frequency bands is obtained without departing from the scope of the invention. 'invention.
  • connection between the symmetrizer SYTR and the output terminal S is provided with a high-pass filter consisting of a capacity CPH, for example 12 pFarad
  • FIG. 2 are shown the metallic elements constituting an embodiment of an antenna conforming to the diagram of FIG. 1.
  • the two unipoles U1, U2 are U-shaped; the length L1 is 200 mm; the vertices S1, S2 of the unipoles are respectively connected the two conductors BF1, BF2 of the two-wire line whose length l is 130 mm; all these elements are made of 0.4 ⁇ 5 tinned iron; the two conductors BF1, BF2 are arranged face to face at a distance E of 20 mm.
  • the transmitter is in the direction of the arrow EM, it is advantageous to have a director strand BD at a distance D of 30 mm from the plane of the dipole; the length of the BDL director strand is 150 mm.
  • the electrical measurements show a gain of 2 to 3 dB depending on the frequency between 470 and 860 MHz (UHF), and of _2 to _6 dB of 175 to 225 MHz (VHF) compared to the half-wave doublet .

Claims (6)

1. Empfangsantenne zum Empfangen elektromagnetischer HF-Signale, die durch einen Doppelkonus-Ganzwellendipol mit einer Impedanz Z1 für den Empfang eines ersten Frequenzbereiches gebildet ist, wobei dieser Dipol zwei V- oder U-förmige Unipole aufweist, die in derselben Ebene auf je einer Seite einer Symmetrieachse vorgesehen sind, wobei die Halbierende den beiden Vs gemeinsam ist und im wesentlichen senkrecht zu der genannten Symmetrieachse steht, wobei jeder Unipol eine Spitze und eine charakteristische Länge L1 hat, entsprechend einer Wellenlänge λ1, gewählt aus den Wellenlängen des genannten ersten Frequenzbereiches, dadurch gekennzeichnet, daß sie außerdem eine doppeladrige Leitung aufweist, die aus zwei einander gegenüberliegenden, sich parallel zueinander und zu der genannten Symmetrieachse erstreckenden Leitern besteht, von denen je ein Ende mit der Spitze eines der beiden Dipole verbunden ist, daß die genannte doppeladrige Leitung für den genannten ersten Frequenzbereich eine Impedanz Z′1 hat, im wesentlichen gleich der genannten Impedanz Z1 des Dipols, und daß die genannte doppeladrige Leitung eine Länge ˝l˝ hat, so daß, in Zusammenarbeit mit dem Doppelkonusdipol, ein Dublett gebildet wird, bei dem jeder Stab eine Länge ˝L2˝ hat, nahezu entsprechend der Summe ˝L1˝ + ˝l˝ (L2 = L1 + 1), wobei die Länge L2 einer Wellenlänge λ/2 entspricht, gewählt aus den Wellenlängen eines zweiten zu empfangenden Frequenzbereiches, wobei der Empfang des genannten zweiten Frequenzbereiches gleichzeitig mit dem ersten Frequenzbereich erfolgt.
2. Antenne nach Anspruch 1, wobei der genannte erste Frequenzbereich das UHF-Band ist, wobei die genannte Länge L1 (= λ/2) dann zwischen 31 cm und 17 cm liegt, vorzugsweise L1 = 20 cm, dadurch gekennzeichnet, daß der genannte zweite Frequenzbereich das VHF-Band ist, daß das genannte Dublett ein Halbwellendublett (λ2) ist und daß die genannte Länge L2 zwischen 40 cm und 30 cm liegt, vorzugsweise L2 = 33 cm, was dem Wert l = 13 cm entspricht.
3. Antenne nach Anspruch 2, wobei die Impedanz Z1 des Doppelkonusdipols nahezu dem Wert 300 Ohm entspricht, dadurch gekennzeichnet, daß die Impedanz Z′1 der doppeladrigen Leitung, die der Impedanz Z1 von 300 Ohm nahezu entspricht, durch zwei Leiter erhalten wird, die je durch eine ferrometallische Platte gebildet werden mit einer Breite von etwa 5 mm und einer Dicke von 0,4 mm, wobei die beiden Platten einander gegenüber angeordnet sind in einem gegenseitigen Abstand von etwa 20 mm symmetrisch zu der genannten Symmetrieebene des Dipols.
4. Antenne nach Anspruch 3 weiterhin mit einer Ausgangsklemme (S) und mit einer Masse (M) zum Liefern der elektrischen Signale, die erhalten werden bei einer Impedanz von nahezu 75 Ohm, ungeachtet des betreffenden Frequenzbereiches, dadurch gekennzeichnet , daß zunächst für den UHF-Empfang einerseits ein erstes freies Ende der doppeladrigen Leitung unmittelbar mit der genannten Ausgangsklemme verbunden wird, während andererseits das zweite freie Ende der doppeladrigen Leitung mittels eines Symmetrierelementes und eines Impedanzwandlers (SYTR) mit dem Verhältnis 4 mit derselben Ausgangsklemme verbunden wird, daß danach für den VHF-Empfang einerseits die genannte Ausgangsklemme mittels eines Hochpaßfilters gegenüber dem Symmetrierelement isoliert wird, während andererseits das zweite freie Ende der doppeladrigen Leitung mittels eines Tiefpaßfilters mit der genannten Masse verbunden wird.
5. Antenne nach Anspruch 4, dadurch gekennzeichnet, daß das genannte Hochpaßfilter eine Kapazität ist mit einem Wert von 12 pF und daß das genannte Tiefpaßfilter durch eine LLC-Schaltung gebildet wird mit L1 = 70 nH, L2 = 70 nH und C = 180 pF.
6. Antenne nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet , daß sie mit einem oder mehreren parasitären Richt- und/oder Reflexionselementen versehen ist, damit die Richtcharakteristik der Antenne von einer doppelseitigen in eine einseitige Form umgewandelt werden kann.
EP87201401A 1986-07-23 1987-07-21 Antenne für hohe Frequenzen Expired - Lifetime EP0254373B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8610690A FR2602097B1 (fr) 1986-07-23 1986-07-23 Antenne pour signaux hautes frequences
FR8610690 1986-07-23

Publications (2)

Publication Number Publication Date
EP0254373A1 EP0254373A1 (de) 1988-01-27
EP0254373B1 true EP0254373B1 (de) 1991-06-05

Family

ID=9337670

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87201401A Expired - Lifetime EP0254373B1 (de) 1986-07-23 1987-07-21 Antenne für hohe Frequenzen

Country Status (4)

Country Link
EP (1) EP0254373B1 (de)
JP (1) JPS6340401A (de)
DE (1) DE3770533D1 (de)
FR (1) FR2602097B1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1212789A (zh) * 1996-02-27 1999-03-31 汤姆森消费电子有限公司 正交转换的天线系统
DE10242935B3 (de) * 2002-09-16 2004-04-29 Kathrein-Werke Kg Antennenanordnung mit einem Flächendipol

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE943834C (de) * 1939-08-05 1956-06-01 Fernseh Gmbh Antennenanlage
GB580812A (en) * 1943-12-06 1946-09-20 Standard Telephones Cables Ltd Improvements in arrangements for coupling wide frequency band antennae to transmission lines
GB807961A (en) * 1956-03-16 1959-01-28 Belling & Lee Ltd Improvements in aerials
FR93172E (fr) * 1966-11-04 1969-02-21 Cit Alcatel Dispositif d'antennes fixes communes pour deux gammes d'ondes.
DE3218690C1 (de) * 1982-05-18 1986-07-17 Siemens AG, 1000 Berlin und 8000 München Bikonische Rundstrahlantenne
JPS60149204A (ja) * 1984-01-13 1985-08-06 Toyota Motor Corp 車両用２周波共用アンテナ

Also Published As

Publication number Publication date
JPS6340401A (ja) 1988-02-20
FR2602097A1 (fr) 1988-01-29
EP0254373A1 (de) 1988-01-27
DE3770533D1 (de) 1991-07-11
FR2602097B1 (fr) 1988-10-21

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