EP1349235B1 - Dualband- Antennensystem für VHF/UHF - Google Patents

Dualband- Antennensystem für VHF/UHF Download PDF

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Publication number
EP1349235B1
EP1349235B1 EP03100746A EP03100746A EP1349235B1 EP 1349235 B1 EP1349235 B1 EP 1349235B1 EP 03100746 A EP03100746 A EP 03100746A EP 03100746 A EP03100746 A EP 03100746A EP 1349235 B1 EP1349235 B1 EP 1349235B1
Authority
EP
European Patent Office
Prior art keywords
antenna
frequency band
uhf
line
radiating element
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
EP03100746A
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English (en)
French (fr)
Other versions
EP1349235A1 (de
Inventor
Fréderic Thales Ngo Bui Hung
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.)
Thales SA
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Thales SA
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Filing date
Publication date
Application filed by Thales SA filed Critical Thales SA
Priority to SI200330820T priority Critical patent/SI1349235T1/sl
Publication of EP1349235A1 publication Critical patent/EP1349235A1/de
Application granted granted Critical
Publication of EP1349235B1 publication Critical patent/EP1349235B1/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
    • H01Q21/00—Antenna arrays or systems
    • H01Q21/30—Combinations of separate antenna units operating in different wavebands and connected to a common feeder system
    • 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
    • H01Q5/314—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors
    • H01Q5/321—Individual or coupled radiating elements, each element being fed in an unspecified way using frequency dependent circuits or components, e.g. trap circuits or capacitors within a radiating element or between connected radiating elements
    • 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
    • H01Q9/16—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole
    • H01Q9/18—Vertical disposition of the antenna

Definitions

  • VHF Very High Frequencies
  • FIG. 1 is an example of antenna A installed on a terrestrial vehicle V.
  • the antenna is composed essentially of an upper radiating element 1 and a lower radiating element 2, which are both powered by means of a supply device 4.
  • the lower radiating element 2 is normally equipped at its lower end with a current blocker 3, usually designated in English by the expression "RF cable choke". ".
  • Modern transceivers operating for example in the frequency band 30 to 88 MHz currently have a service channel which implements other frequency bands, in particular the frequencies of the UHF band. (Ultra High Frequencies) 2.4 to 2.5 GHz.
  • the radiating elements 1 and 2 of the broadband antenna mentioned above which have a length dimensioned for the VHF band of 30 to 88 MHz, typically a length of the order of 1.6 meters, are not suitable to function properly with UHF frequencies from 2.4 to 2.5 GHz. These last require in fact radiating elements of dimension about thirty times smaller.
  • FIG. 2a An example of a block diagram of this solution is shown in FIG. 2b, in which is diagrammed a transceiver station 7 feeding a VHF antenna, A and a UHF antenna, A 'through a duplexer 8 whose role is to separate the VHF frequencies and UHF frequencies and route them to their respective antennas.
  • Patent FR 2 806 535 discloses an antenna system consisting of antennas dedicated to two frequency bands without electrical connection between them. It is known that the coupling between the different frequency bands is not stabilized and varies according to the installation configuration of the antenna system on the carrier vehicle. The supply of the antenna elements of the two high and low frequency bands must imperatively be performed by two distinct coaxials except for the use of an external duplexer. The antenna corresponding to the low frequency band consists of only one radiating element.
  • Patent DE 38 26 777 describes an antennal system consisting of two antennas, one in high band and the other in low band, superimposed one over the other. As a result, the total length of the antennal system is the sum of the lengths of the antennas that constitute it.
  • a low frequency frequency band [Fbb, Fbh]
  • Fhb, Fhh high frequency frequency band
  • the supply device is for example connected to a transceiver station by means of a transmission line and the lower radiating element consists for example of a section of the transmission line and the antenna assembly comprises at least a hollow radiating element disposed around the section.
  • the system may comprise several hollow elements interconnected and in series with the means of line portions, the core of a portion connecting the upper end of the hollow element indexed i to the lower end of the indexed element i +1 and the shielding of the index line portion i is connected to the coaxial line, for example to the shielding of the line.
  • a duplexer is for example arranged at the lower part of the antenna assembly and is connected to at least one hollow element and the line section.
  • the system is for example used for radio frequency signals.
  • FIG. 3 presents the block diagram of an antenna according to the invention intended to operate in particular in the two VHF frequency bands of 30 to 88 MHz and UHF of 2.4 to 2.5 GHz.
  • the antenna is in this example installed on a vehicle.
  • the distance between the feed device 4 and the current blocker 3 is for example of the order of 1.6 meters.
  • the mass M of the vehicle is taken in this embodiment as mass common to the entire system.
  • the coaxial transmission line 9 consists for example of several sections. These sections are connected together using, for example, known and not shown devices, such as male and female coaxial connectors, etc.
  • the fastening base 5 and its spring 6, the mechanical means that make the antenna of the latter or the ancillary elements (such as radome, connectors, etc.) that provide the rigidity and the assembly of the components will not be interdependent. detailed because they are not necessary for the understanding of the invention.
  • the current blocker 3 (adapted to the VHF) whose function is to delimit radioelectrically the section 9 1 of the coaxial transmission line 9, is realized for example according to the known techniques of the skilled person.
  • the implementation of a skirt around the coaxial transmission line or the winding of this line around a ferrite core, etc. will not be detailed for the sake of clarity.
  • the upper radiating element 1 and the lower radiating element 2 constitute, for example, the two strands of a dipole sized to radiate in the VHF frequency band, for example in the entire band of 30 to 88 MHz. They are fed through the power supply device 4 which realizes the impedance matching to allow the maximum transfer of RF (radio frequency) power supplied by the coaxial transmission line 9. This is true in the entire frequency band of 30 to 88 MHz.
  • An exemplary embodiment of the feed device 4 is shown schematically in FIG.
  • FIG. 4 is a sectional view of an exemplary embodiment of the antenna assembly 10, where the line section 9 1 is interrupted to have for example a duplexer 8, thus leading to a lower part of the section and an upper part. of the section.
  • the ends of the interrupted section are referenced 9 11 and 9 12 .
  • the upper end 9 11 of the lower part of the section 9 1 is provided with a current blocker 11 sized for the UHF frequencies.
  • This current blocker has the particular function of isolating the signals of the UHF band while remaining transparent to the signals of the VHF band.
  • the technique for producing this current blocker is, for example, a quarter-wave skirt known to those skilled in the art.
  • a skirt body 11 1 of tubular shape surrounds the section 9 1 of the coaxial line, the lower edge 11 2 of this skirt body is short-circuited by a cover 11 4 to the shield 9 B of the coaxial line while the edge upper 11 3 is left open to provide the current blocking function.
  • duplexer-adapter 8 Between the lower part of the section and the upper part is arranged a duplexer-adapter 8.
  • the connection of the duplexer-adapter 8 to the ends 9 11 and 9 12 is effected for example by connecting the shielding of these ends to the common ground 12 of the duplexer-adapter 8 and in connecting the cores of the ends 9 11 and 9 12 of this coaxial line respectively to the input terminal 8 1 and to the output terminal 8 2 of the VHF channel of the duplexer-adapter 8.
  • This duplexer-adapter comprises a pass filter 13 which behaves as a direct connection between the input terminals 8 1 and 82 for the VHF signals and an open circuit for the UHF signals.
  • the high-pass filter 14 of the duplexer-adapter behaves as a direct connection between the input terminal 8 1 and the output terminal 8 3 of the UHF channel for the UHF signals which are thus taken from the input terminal 8 1 to be brought up to the output terminal 8 3 .
  • the length L of these elements is for example of the order of the average half-wavelength corresponding to the UHF band.
  • the elements have, for example, substantially identical lengths. Insulating parts used to maintain the coaxial line in the cylindrical tubes or to ensure the assembly and rigidity of the assembly are not detailed because they are known to those skilled in the art.
  • the radiating elements 15i are connected to each other by means of portions 16i of coaxial line, for example they are coupled in series. The length of a portion 16i is substantially equal to the half-average wavelength corresponding to the UHF band.
  • the core 17i of a portion 16i connects the upper end 15 i2 of the element 15 i to the lower end 15 (i + 1) 1 of the element 15 (i + 1) .
  • the web 17 1 of the portion of line 16 1 connected to upper end 15, 12 of the lower element 15 1 in the lower end 15, 21 of the element 15 2 and the web 17 2 of the portion line 16 2 connects the upper end 15 22 of the element 15 2 at the lower end 31 of the element 15 3 .
  • the shields 18 1 and 18 2 of the line portions 16 1 and 16 2 are electrically connected, for example, to the shield of the coaxial line 9 1 .
  • the radiating assembly consisting for example of cylindrical tubes 15 1 , 15 2 and 15 3 and connecting portions 16 1 and 162 is supplied with RF power of the UHF band by connecting the lower end 11 of the cylindrical hollow element 15 1 closest to the duplexer-adapter to the output terminal 8 3 of the duplexer-adapter.
  • a cover 19 is placed for example towards the middle of the upper tube 3 to short circuit the latter to the shielding of the coaxial line.
  • a quarter-wave skirt 20 of the type in the lower part is thus formed to act as a current blocker for the UHF signals.
  • the number of cylindrical tubes is chosen in particular according to the desired directivity for the UHF antenna. Without departing from the scope of the invention, the structure of the antenna described also applies to antennas operating in other frequency bands, while respecting the condition that these frequency bands are not adjacent. Any hollow element whatever its shape can be used as a radiating element.
  • FIG. 5 describes an example of a power supply device 4.
  • the latter comprises an impedance transformer 21 whose output 22 of its secondary winding 23 is connected to the upper radiating element 1.
  • the primary winding 24 of this step-up transformer impedance is connected to the connection point 25 to the core of the transmission line 9 through a parallel LC circuit 26 consisting of an inductor 27 and a capacitor 28, followed by a series LC circuit 29 consisting of an inductor 30 and a capacitor 31.
  • the ground of this matching circuit is connected to the shield of the coaxial transmission line 9 at the connection point 32.
  • the value of the transformation ratio of the transformer 21 and the values of the inductances 27, 30 and capabilities 28, 31 are determined for that the impedance presented between the connection points 25 and 32 is as close as possible to the usual characteristic impedance of 50 ohms for all frequencies in the 30 to 88 MHz band.
  • FIG. 6 details an embodiment of the duplexer-adapter.
  • the low-pass filter 13 is provided by a portion 33 of coaxial line of which a first end 34 is short-circuited (that is to say that the core and the shield of the coaxial line are connected together) and constitutes the terminal 8 2 and whose opposite end 35 has its soul connected to the terminal 8 1 and its shielding left free.
  • the high-pass filter 14 is provided by a portion 36 of coaxial line whose shield 37 from its upper end constitutes the terminal 8 3 and whose core 38 of the other end is connected to the terminal 8 1 .
  • the lengths of the portions 33 and 36 are of the order of magnitude of the quarter of the average wavelength corresponding to the UHF band and are adjusted to allow the impedance matching of the antenna assembly 10 according to the invention to UHF frequencies used.
  • FIG. 7 represents another variant embodiment of the invention.
  • the antenna according to the invention has here two separate accesses allowing the connection of two transceiver stations 7 1 and 7 2 operating one in the VHF band of 30 to 88 MHz and the other in the UHF band of 2, 4 to 2.5 GHz.
  • the station 7 1 of the VHF band is for example connected to the supply device 4 by the coaxial transmission line 9 which passes through the current blocker 3 and an antenna assembly 10 '.
  • the station 7 2 of the UHF band is for example connected to the radiating elements 15i of the antenna assembly 10 'by the section 9' 1 of the coaxial secondary transmission line 9 'which passes through the current blocker 3.
  • This antennal assembly 10 ' does not include a duplexer-adapter unlike the antenna set given in the previous example.
  • the section 9 1 of coaxial line remains uninterrupted between the current blocker 3 and the supply device 4.
  • the supply of the radiating tubular elements 15i is made by connecting the lower end 11 of the element 15 1 closest to the line section 9 ' 1 to the core 9' A of this section 9 ' 1 whose shield 9' B is integral with that of the section 9 1 of the coaxial line 9.
  • the shields of the line sections 9 1 and 9 ' 1 behave radioelectrically as a single shield when passage through the current blockers 3 and 11.
  • the other end of the secondary coaxial line is connected to the transceiver station 7 2 of the UHF band.
  • FIGS. 9 and 10 schematize an alternative embodiment described in FIGS. 7 and 8 where the two emitters 7 1 and 7 2 are replaced by a single emitter 7 which directly supplies the transmission line 9.
  • This line is interrupted so as to position a duplexer 8 in a manner similar to that described in Figure 4.
  • This duplexer feeds the two line sections 9 1 and 9 ' 1 which were detailed in Figures 7 and 8.
  • FIG. 10 shows in detail the connection between the duplexer 8 and the line sections 9 1 and 9 ' 1 .
  • the connection of the duplexer-adapter 8 to the ends 9 11 and 9 12 of the interrupted line section 9 1 is carried out for example by connecting the shielding of these ends to the common ground 12 of the duplexer-adapter 8 and connecting the ends of the cores 9 11 and 9 12 of this line coaxial respectively to the input terminal 8 1 and the output terminal 8 2 of the VHF channel of the duplexer-adapter 8.
  • the secondary line 9 ' 1 the latter is in connection with the exit 8 3 of the UHF channel.
  • This duplexer-adapter comprises a low-pass filter 13 which behaves as a direct connection between the input terminals 8 1 and 8 2 for the VHF signals and an open circuit for the UHF signals.
  • the high-pass filter 14 of the duplexer adapter behaves as a direct connection between the input terminal 8 1 and the output terminal 8 3 of the UHF channel for the UHF signals which are thus taken from the input terminal 8 1 to be brought to the output terminal 8 3 to feed the line section 9 ' 1 .
  • the current blocker 11 sized for the UHF frequencies is located on the two transmission lines 9 1 and 9 ' 1 and above the duplexer. It has characteristics identical or substantially identical to those given in Figure 4 and in fact will not be detailed.

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  • Variable-Direction Aerials And Aerial Arrays (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
  • Details Of Aerials (AREA)
  • Aerials With Secondary Devices (AREA)

Claims (7)

  1. Breitband-Antennensystem, das Signale in einem Niederfrequenz-Frequenzband [Fbb, Fbh], das mehr als eine Oktave abdeckt, und in einem Hochfrequenz-Frequenzband [Fhb, Fhh] ausstrahlen oder empfangen kann, mit Fbh>=2Fhb, das mindestens aufweist: eine Versorgungsvorrichtung (4), die im Niederfrequenz-Frequenzband mindestens ein oberes strahlendes Element (1) und ein unteres strahlendes Element (2) versorgt, wobei das obere strahlende Element und das untere strahlende Element die beiden Teilstücke eines Dipols bilden, wobei die Versorgungsvorrichtung (4) über eine Übertragungsleitung (9) mit einer Sende/Empfangsstation (7) verbunden ist, dadurch gekennzeichnet, dass das untere strahlende Element (2) mit mindestens einer Antennenbaueinheit (10) ausgestattet ist, die angepasst ist, um im Hochfrequenz-Frequenzband [Fhb, Fhh] zu strahlen, und dass das untere strahlende Element (2) aus einem Abschnitt (91) der Übertragungsleitung (9) besteht, und die Antennenbaueinheit (10) mindestens mehrere Hohlelemente (15i, i=1, 2, ...) aufweist, wobei die Elemente miteinander und in Reihe mit Hilfe von Leitungsabschnitten (16i, i=1, 2, ...) verbunden sind, wobei der Kern (17i, i=1, 2, ...) eines Abschnitts (16i, i=1, 2, ...) das obere Ende (15i2, i=1, 2, ...) des Hohlelements (15i, i=1, 2, ...) mit dem unteren Ende (15(i+1)1, i=1, 2, ...) des Elements (15i+1, i=1, 2, ...) verbindet, und die Abschirmung (18i, i=1, 2, ...) des Abschnitts (16i) elektrisch mit der Koaxialleitung (9) verbunden ist.
  2. Antennensystem nach Anspruch 1, dadurch gekennzeichnet, dass es einen Duplexer (8) in Höhe des unteren Bereichs der Antennenbaueinheit (10) aufweist, der mit mindestens einem Hohlelement (15i, i=1, 2, ...) und mit dem Abschnitt (91) verbunden ist.
  3. Antennensystem nach Anspruch 2, dadurch gekennzeichnet, dass der Duplexer (8) mindestens ein Tiefpassfilter (13), das aus einem kurzgeschlossenen Koaxialleitungsabschnitt (33) besteht, und/oder mindestens ein Hochpassfilter (14) aufweist, das aus einem Koaxialleitungsabschnitt (36) im offenen Stromkreis besteht.
  4. System nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass es eine erste Sende/Empfangsstation (71), die im Niederfrequenzband arbeitet und mit einer ersten Übertragungsleitung (9) verbunden ist, und eine zweite Sende/Empfangsstation (72) aufweist, die im Hochfrequenzband arbeitet und mit einer zweiten koaxialen Übertragungsleitung (9') verbunden ist, wobei die zweite Leitung auch mit einem der strahlenden Hohlelemente in Verbindung steht, wobei die Abschirmungen der zwei Leitungen miteinander verbunden sind.
  5. Antennensystem nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass es einen Stromblocker wie eine Viertelwellen-Schürze aufweist.
  6. System nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, dass die Versorgungsvorrichtung (4) einen Impedanzwandler (21) und/oder mindestens eine LC-Parallelschaltung (26) und/oder mindestens eine LC-Reihenschaltung (29) aufweist.
  7. Verwendung des Systems nach einem der Ansprüche 1 bis 6 für Funkfrequenzsignale.
EP03100746A 2002-03-26 2003-03-24 Dualband- Antennensystem für VHF/UHF Expired - Lifetime EP1349235B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SI200330820T SI1349235T1 (sl) 2002-03-26 2003-03-24 Dvopasovni antenski sistem VHF/UHF

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0203765A FR2837988B1 (fr) 2002-03-26 2002-03-26 Systeme antennaire bi-bande vhf-uhf
FR0203765 2002-03-26

Publications (2)

Publication Number Publication Date
EP1349235A1 EP1349235A1 (de) 2003-10-01
EP1349235B1 true EP1349235B1 (de) 2007-03-07

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EP03100746A Expired - Lifetime EP1349235B1 (de) 2002-03-26 2003-03-24 Dualband- Antennensystem für VHF/UHF

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US (1) US6836256B2 (de)
EP (1) EP1349235B1 (de)
AT (1) ATE356446T1 (de)
DE (1) DE60312249D1 (de)
ES (1) ES2283713T3 (de)
FR (1) FR2837988B1 (de)
SI (1) SI1349235T1 (de)

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Also Published As

Publication number Publication date
DE60312249D1 (de) 2007-04-19
ATE356446T1 (de) 2007-03-15
US20030227419A1 (en) 2003-12-11
SI1349235T1 (sl) 2007-08-31
ES2283713T3 (es) 2007-11-01
US6836256B2 (en) 2004-12-28
EP1349235A1 (de) 2003-10-01
FR2837988A1 (fr) 2003-10-03
FR2837988B1 (fr) 2008-06-20

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