EP2237372A1 - Antenne dipole pour station de base à bande CB - Google Patents

Antenne dipole pour station de base à bande CB Download PDF

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Publication number
EP2237372A1
EP2237372A1 EP10158258A EP10158258A EP2237372A1 EP 2237372 A1 EP2237372 A1 EP 2237372A1 EP 10158258 A EP10158258 A EP 10158258A EP 10158258 A EP10158258 A EP 10158258A EP 2237372 A1 EP2237372 A1 EP 2237372A1
Authority
EP
European Patent Office
Prior art keywords
coaxial line
dipole antenna
coaxial
base station
choke coil
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.)
Withdrawn
Application number
EP10158258A
Other languages
German (de)
English (en)
Inventor
Pier Francesco Grazioli
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.)
Sirio Antenne Srl
Original Assignee
Sirio Antenne Srl
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 Sirio Antenne Srl filed Critical Sirio Antenne Srl
Publication of EP2237372A1 publication Critical patent/EP2237372A1/fr
Withdrawn legal-status Critical Current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
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
    • 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
    • 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
    • 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

Definitions

  • the present invention refers to a dipole antenna for a CB band base station.
  • the invention refers to a dipole antenna for a CB band base station which makes it possible to avoid using cumbersome radials and to eliminate the tuning coils that are usually necessary, thus obtaining a useful band of impedance that is much wider than that of known antennae, with the least possible hindrance.
  • the basic antennae commonly used are of the "ground plane”, "quarter-wave”, “half-wave dipole” or “five-eighths wave” type. Such antennae have a vertical pole of length that is proportional to the wavelength and, in some versions, radials.
  • the "ground plane” type well known in the literature, is constituted by a vertical pole of quarter-wavelength and by a plurality of radials, also of quarter-wavelength, which form an angle at 90° from the vertical pole (see figure 1 ).
  • a second version is shown in figure 2 where the radials are bent downwardly until they form an angle that is on average comprised between 120° and 140° to improve the adaptation of the impedance to the classic 50 ohm.
  • the aforementioned antennae are easy to manufacture, and can be supplied with power directly to the centre, but have cumbersome radials which must be inclined in order to obtain a correct impedance.
  • the "half-wave" type shown in figure 3 is substantially a dipole antenna powered at its lower end by means of an impedance transformer. Manufacturing an antenna of this type does not require the use of radials but it does imply a careful construction of the impedance transformer which in any case limits its usage band.
  • the "five-eighths wave” type with a signal gain that is slightly higher than those of the previous types, is constituted by a vertical pole, of length equal to five-eighths of the wavelength, and by a plurality of radials which are essential for correct functioning and, as with the half-wave type, an adequate impedance transformer which, in this case also, limits its usage band (see figure 4 ).
  • the aim of the present invention is to devise a dipole antenna of the type that makes it possible to avoid using cumbersome radials, and at the same time eliminating the tuning coils.
  • an object of the present invention is to devise a dipole antenna that makes it possible to obtain a useful band of impedance that is much wider than that of known antennae, with the least possible encumbrance.
  • Another object of the present invention is to devise a dipole antenna that is decoupled from the support structure, to avoid distortions in the radiation diagram.
  • Another object of the present invention is to devise a dipole antenna that is highly reliable, relatively simple to provide and at competitive cost.
  • a dipole antenna for a CB band base station characterized in that it is provided by means of a coaxial line comprising a first portion that is connected to a second portion which constitutes a choke coil and to a third portion which constitutes a radiating element.
  • the dipole antenna according to the present invention comprises, with reference to its first embodiment shown in figure 5 , a coaxial feeder line 2, connected to a generator, not shown, such coaxial feeder line 2, with characteristic impedance of 50 ohm, continuing in a choke coil 3, made with coils that are distanced and arranged parallel to each other.
  • the coaxial feeder line 2 which thus continues in the choke coil 3, finally continues in a portion of coaxial line 4 that has a length that is equal to, for example, a quarter of the wavelength and self-impedance Zc.
  • the central conductor 5 of the coaxial line is electrically connected to a metal radiator 6 having a length that is equal to, for example, a quarter of the wavelength.
  • the radiofrequency signal that comes from the generator travels inside the feeder line 2, continues into the coaxial cable forming the coils of the choke coil 3, and then continues into the portion of coaxial line 4 to arrive at the junction point with the radiator 6.
  • the current that travels through the radiator 6 will stop at the upper end of the radiator 6, while the external current of the portion of coaxial line 4 which returns downwards will be blocked by the choke coil 3, because a choke inductance is present which is connected in series with such current.
  • the choke coil 3 produces its choke effect on the currents beginning from a minimum frequency, to be identified according to necessity, and for all higher frequencies, and it is therefore intrinsically wide-band.
  • the current that travels on the outside of the coaxial cable or portion of feeder line 4 is concordant with the current that travels through the radiator 6.
  • Another advantage of the antenna according to the invention is that, with the varying of the frequency, the currents on the radiator are always in phase for all lengths that are shorter than an entire wave, as shown in figure 8 (as in a classic dipole antenna, powered internally). Therefore, by means of suitable systems for impedance adaptation, this structure functions correctly even when its length is other than half-wave with signal gains proportional to its length.
  • Figure 6 shows the dipole antenna according to the invention in a second embodiment and in such figure the same reference numerals refer to identical elements.
  • radiator 6 located at the end of the portion of coaxial line 4
  • radiator 6 is replaced by another coaxial line 7, arranged in such a way that the central conductor 5 of the portion of coaxial line 4 is connected with the outer part of the coaxial line 7, while the outside of the portion of coaxial line 4 is connected with the internal conductor 8 of the portion of coaxial line 7.
  • the central or internal conductor 8 of the portion of coaxial line 7 and the outer shielding of such portion 7 are electrically connected to each other.
  • the outer shielding of the portion 7 of coaxial line performs such function of the radiator 6, while its internal conductor 8 defines a path and ensures the presence of a direct current short-circuit to protect the transmission apparatus from electrical discharges generated by atmospheric disturbances.
  • the impedance of the portion of coaxial line 7 is conveniently a self-impedance Ze.
  • the sections of coaxial cable can conveniently be contained inside a dielectric tube, such as for example a fibreglass tube, which carries out the function both of mechanical support and of protection from atmospheric agents.
  • Figure 7 shows the dipole antenna according to the present invention in a third embodiment.
  • the difference between the third embodiment shown in figure 7 and the second embodiment shown in figure 6 consists in that a radiating element 9 is connected to the upper end of the coaxial line 7, at the internal conductor 8 of the coaxial line 7.
  • the radiating element 9 can be compared to the radiator 6 in the first embodiment.
  • the third embodiment of the invention is a combination of the first and second embodiments described previously.
  • the overall radiating part of the third embodiment of the invention is therefore composed of the internal conductor 8 and the radiator 9 and their overall lengths are, for example, quarter-wave, thus functioning like the upper portions of the embodiments in figures 5 and 6 .
  • the length of the coaxial line formed by the coaxial line 7 and by the internal conductor 8 becomes usable as a new parameter for regulating and optimising the global impedance.
  • the dipole antenna according to the present invention fully achieves the intended aim and objects.

Landscapes

  • Mobile Radio Communication Systems (AREA)
  • Details Of Aerials (AREA)
EP10158258A 2009-04-03 2010-03-29 Antenne dipole pour station de base à bande CB Withdrawn EP2237372A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT000540A ITMI20090540A1 (it) 2009-04-03 2009-04-03 Antenna dipolo per stazione base in banda cb.

Publications (1)

Publication Number Publication Date
EP2237372A1 true EP2237372A1 (fr) 2010-10-06

Family

ID=41228724

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10158258A Withdrawn EP2237372A1 (fr) 2009-04-03 2010-03-29 Antenne dipole pour station de base à bande CB

Country Status (2)

Country Link
EP (1) EP2237372A1 (fr)
IT (1) ITMI20090540A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2485457A (en) * 1944-10-20 1949-10-18 Bell Telephone Labor Inc Antenna system
US3031668A (en) * 1960-11-21 1962-04-24 Comm Products Company Inc Dielectric loaded colinear vertical dipole antenna
US3656167A (en) * 1969-11-25 1972-04-11 Plessey Co Ltd Dipole radio antennae
US4217589A (en) * 1976-01-12 1980-08-12 Stahler Alfred F Ground and/or feedline independent resonant feed device for coupling antennas and the like
US4937588A (en) * 1986-08-14 1990-06-26 Austin Richard A Array of collinear dipoles
US20050040991A1 (en) * 2003-07-19 2005-02-24 Crystal Bonnie A. Coaxial antenna system

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2485457A (en) * 1944-10-20 1949-10-18 Bell Telephone Labor Inc Antenna system
US3031668A (en) * 1960-11-21 1962-04-24 Comm Products Company Inc Dielectric loaded colinear vertical dipole antenna
US3656167A (en) * 1969-11-25 1972-04-11 Plessey Co Ltd Dipole radio antennae
US4217589A (en) * 1976-01-12 1980-08-12 Stahler Alfred F Ground and/or feedline independent resonant feed device for coupling antennas and the like
US4937588A (en) * 1986-08-14 1990-06-26 Austin Richard A Array of collinear dipoles
US20050040991A1 (en) * 2003-07-19 2005-02-24 Crystal Bonnie A. Coaxial antenna system

Also Published As

Publication number Publication date
ITMI20090540A1 (it) 2010-10-04

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