EP0814537B1 - Verfahren und Vorrichtung zum Verringern von Rückstrahlungen sowie Strahlungen unterhalb des Horizonts in einer Gruppenantenne - Google Patents

Verfahren und Vorrichtung zum Verringern von Rückstrahlungen sowie Strahlungen unterhalb des Horizonts in einer Gruppenantenne Download PDF

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Publication number
EP0814537B1
EP0814537B1 EP19970401351 EP97401351A EP0814537B1 EP 0814537 B1 EP0814537 B1 EP 0814537B1 EP 19970401351 EP19970401351 EP 19970401351 EP 97401351 A EP97401351 A EP 97401351A EP 0814537 B1 EP0814537 B1 EP 0814537B1
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EP
European Patent Office
Prior art keywords
antennae
field
elementary
antennas
group
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
EP19970401351
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English (en)
French (fr)
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EP0814537A1 (de
Inventor
Henri Chemin
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.)
FINANCIERE ET INDUSTRIELLE DES AUTOROUTES Cie
Original Assignee
FINANCIERE ET INDUSTRIELLE DES AUTOROUTES Cie
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Publication date
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Publication of EP0814537A1 publication Critical patent/EP0814537A1/de
Application granted granted Critical
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
    • H01Q3/26—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the relative phase or relative amplitude of energisation between two or more active radiating elements; varying the distribution of energy across a radiating aperture
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/29—Combinations of different interacting antenna units for giving a desired directional characteristic

Definitions

  • the invention relates to a method and a device for decrease the rear radiation of an antenna while lowering this weakened radiation to a selected area below the horizon. She applies more particularly to aerials made up of at least two elementary antennas including the phases are opposite in pairs on the back of said air.
  • Such a system mainly allows a diffusion linear or not of a plurality of transmitters operating on the same frequency, synchronized or no. This is particularly the case of a chain of transmitters isofrequencies along a highway, the weak radiation of the antennas on their rear reducing considerably the length of the interference zone with the previous transmitter.
  • the system allows to reduce to a few hundred meters the interference zone between relays.
  • the effect backward radiation cancellation of the antenna array is disturbed.
  • the upper antenna being located at 34 m, and the antenna less than 2 m below, there is a difference of a few dB between the two radiations in the area interference. It is therefore necessary to compensate for these side effects so that a minimum of energy reaches the interference zone.
  • the object of the invention is therefore to reduce the rear radiation of an array of antennas emission while lowering this attenuation towards a selected area under the horizon.
  • the vertical interval between the elementary antennas of a couple is related to the wavelength and the intrinsic structure of the antenna. According to a particular form of the invention, this interval is about 2 m.
  • the device for implementing the invention is characterized in that it includes a distributor of variable power to adjust the amplitude of the field radiated by each of the elementary antennas of so as to obtain identical result fields in a specific area behind the group of antennas and a phase correction device on each of the elementary antennas in order to obtain an opposition of perfect phase.
  • the power distributor consists of a volume conductor of length ⁇ / 4, of a fixed line and of two moving lines moving relative to the previous in order to increase the level of the low antenna and reduce that of the high antenna.
  • the lines are supplied by serial lines open to their ends (intangible short circuit between the beginning of the serial line and that of the mobile line).
  • the phase correction device is consisting of an adjustable line
  • the antennas elementary 1 and 2 of the aerial radiation system 3 radio transmitter are arranged one above the other and shifted horizontally.
  • the height H1 of the upper antenna 2 is 34 m. and the antenna lower 1 is located below at an interval ⁇ H about 2 m.
  • the receiving antenna 4 of a vehicle traveling on the highway culminates at a height H2 about 2 m.
  • Each antenna radiates a V field. makes the horizontal shift of ⁇ / 4 of the antennas the field V1 of antenna 1 and field V2 of antenna 2 are added forward, so that we have forward from the transmitter a resulting field equal to V1 + V2, and retreat backwards, so that the field resulting back from the transmitter is V2 - V1.
  • the radiation is reflected on the floor.
  • the receiving antenna also captures the resulting reflected field and this disrupts reception.
  • the receiving antenna 4 receives from the transmitting antenna 1 a direct field V1 (X1, Y1) and a reflected field VR1 (X2, Y2); from antenna 2 a direct field V2 (X3, Y3) and a reflected field VR2 (X4, Y4).
  • Y1 and Y3 are neighbors of 0.
  • the object of the invention is to lower the value of R.
  • the device according to the invention is shown in the figure 3.
  • the signal from the transmitter 5 is transmitted to the dispatcher variable power 6 which adjusts the amplitude of signals to elementary antennas to compensate the difference in levels received by the receiver since each of the antennas due to their difference altitude so as to obtain a minimum field R in a area given behind the antennas.
  • this power distributor consists of a cylinder comprising a central line coupled to two lines to variable coupling by rotation.
  • the mobile lines are excited by an open serial line connection for make a non-contact rotating joint.
  • the rotation two lines with variable coupling around the line central allows to distribute the power
  • Each of the adjusted outputs of the distributor is connected to an adjustable phase correction line 7 for the antenna signal 1 and 8 for the antenna signal 2.
  • this area is the interference zone between the rear radiation of the transmitter and the front radiation of the transmitter previous in a linear broadcasting chain simulcast.

Landscapes

  • Variable-Direction Aerials And Aerial Arrays (AREA)

Claims (5)

  1. Verfahren zur Reduzierung von Feldern hinter einer Gruppe von Antennen mit Richtcharakteristik, die mindestens ein Paar Antennenelemente aufweist, die in senkrechter Richtung um einen bestimmten Abstand und in waagrechter Richtung um λ/4 gegeneinander versetzt sind, gekennzeichnet durch
    ein Auswählen des Orts, an dem das sich ergebende Feld bei Anpassung der Phasen jedes der Antennenelemente derart minimal sein soll, dass der Wert des Felds in einer Zone reduziert ist, die hinter der Gruppe von Antennen und von dieser aus gesehen unter einem unterhalb des Horizonts bestimmten Winkel bestimmt ist,
    ein Abgleichen der Amplituden der von den Antennenelementen empfangenen Signale durch eine derartige Aufteilung der Leistung, dass das sich ergebende ausgestrahlte Feld in der gewählten Zone minimal ist.
  2. Vorrichtung zur Ausstrahlung einer Funkübertragung, mit einem oberirdischen Antennensystem, das aus mindestens einem Paar Antennenelemente besteht, die in senkrechter Richtung um eine bestimmte Höhe und in waagrechter Richtung um λ/4 gegeneinander versetzt sind, dadurch gekennzeichnet, dass die Vorrichtung zusätzlich einen variablen Leistungsteiler, der ein Anpassen der Amplitude der von jedem der Antennenelemente empfangenen Feld ermöglicht, und eine Einrichtung zur Phasenkorrektur an jedem der Antennenelemente dergestalt aufweist, dass in einer Zone ein sich zu Null ergebendes Feld erhalten wird, die hinter der Gruppe von Antennen und von dieser aus gesehen unter einem unterhalb des Horizonts bestimmten Winkel bestimmt ist.
  3. Vorrichtung gemäß Anspruch 2, dadurch gekennzeichnet, dass der Leistungsteiler durch einen Leiterraum mit einer Länge gleich λ/4 mit einer festen Leitung und zwei beweglichen Leitungen besteht, die durch eine offene Leitungsverbindung angeregt werden, wobei sie sich gegenüber letzterer derart bewegen, dass sie den Pegel der tiefer gelegenen Antenne erhöhen und denjenigen der höher gelegenen Antenne reduzieren.
  4. Vorrichtung gemäß Anspruch 2, dadurch gekennzeichnet, dass die Einrichtung zur Phasenkorrektur aus einer anpassbaren Leitung besteht.
  5. Anwendung des Verfahrens gemäß Anspruch 1 auf eine Reihe von Sendern gleicher Frequenz entlang einer Fahrspur.
EP19970401351 1996-06-19 1997-06-16 Verfahren und Vorrichtung zum Verringern von Rückstrahlungen sowie Strahlungen unterhalb des Horizonts in einer Gruppenantenne Expired - Lifetime EP0814537B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9607603 1996-06-19
FR9607603A FR2750257B1 (fr) 1996-06-19 1996-06-19 Procede et dispositif de rayonnement a fort rapport avant/arriere dirige

Publications (2)

Publication Number Publication Date
EP0814537A1 EP0814537A1 (de) 1997-12-29
EP0814537B1 true EP0814537B1 (de) 2004-11-17

Family

ID=9493195

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19970401351 Expired - Lifetime EP0814537B1 (de) 1996-06-19 1997-06-16 Verfahren und Vorrichtung zum Verringern von Rückstrahlungen sowie Strahlungen unterhalb des Horizonts in einer Gruppenantenne

Country Status (3)

Country Link
EP (1) EP0814537B1 (de)
DE (1) DE69731582D1 (de)
FR (1) FR2750257B1 (de)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4196436A (en) * 1978-11-14 1980-04-01 Ford Motor Company Differential backlobe antenna array
US5107273A (en) * 1981-05-11 1992-04-21 The United States Of America As Represented By The Secretary Of The Army Adaptive steerable null antenna processor with null indicator
US4423392A (en) * 1981-11-30 1983-12-27 Wolfson Ronald I Dual-mode stripline antenna feed performing multiple angularly separated beams in space
FR2639492B1 (fr) * 1988-11-23 1994-07-29 Autoroutes Cie Financ Indle Procede et dispositif de radiodiffusion isofrequence a interferences attenuees

Also Published As

Publication number Publication date
DE69731582D1 (de) 2004-12-23
EP0814537A1 (de) 1997-12-29
FR2750257A1 (fr) 1997-12-26
FR2750257B1 (fr) 1998-08-21

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