EP2733788A1 - Monoband-Rundstrahler - Google Patents

Monoband-Rundstrahler Download PDF

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Publication number
EP2733788A1
EP2733788A1 EP12447022.0A EP12447022A EP2733788A1 EP 2733788 A1 EP2733788 A1 EP 2733788A1 EP 12447022 A EP12447022 A EP 12447022A EP 2733788 A1 EP2733788 A1 EP 2733788A1
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EP
European Patent Office
Prior art keywords
antenna
elements
interconnected
antenna according
radiating
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Withdrawn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
EP12447022.0A
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English (en)
French (fr)
Inventor
Philippe Herman
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Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to EP12447022.0A priority Critical patent/EP2733788A1/de
Publication of EP2733788A1 publication Critical patent/EP2733788A1/de
Withdrawn legal-status Critical Current

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    • 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
    • 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
    • H01Q9/26—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole with folded element or elements, the folded parts being spaced apart a small fraction of operating wavelength
    • H01Q9/265—Open ring dipoles; Circular dipoles
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/2291—Supports; Mounting means by structural association with other equipment or articles used in bluetooth or WI-FI devices of Wireless Local Area Networks [WLAN]

Definitions

  • the present invention relates, in general, to an omnidirectional single-band antenna for transmitting and receiving audio, video and data signals.
  • the invention relates to a single-channel omnidirectional antenna for transmitting and receiving audio, video and data signals, of the kind comprising at least two interconnected sets of identical antenna elements, the antenna elements of the same together being interconnected, each antenna element comprising a radiating element, in vertical rectilinear polarization, formed of two quadrilaterals united by a common vertex and provided with a radio power supply center and a reflector associated with this radiating element and the feeding centers within the same set of antenna elements lying on a common circle.
  • Wifi Wireless Fidelity
  • WiFi uses a narrow frequency band of the order of 2.4 GHz shared with other roommates and allows to connect laptops, office machines, communicating objects or others on a radius of several tens of meters indoors or over several hundred meters in an open environment.
  • MIMO multiple-input-multiple-output
  • This MIMO technology achieves this by offering high spectral efficiency (more bits per second per hertz bandwidth) as well as reliability or space diversity (anti-fading of the signal). Because of these properties, MIMO technology is an important part of modern wireless communication standards such as IEEE 802.11n
  • EP 2,226,896 an omnidirectional multiband antenna for transmitting and / or receiving audio and / or video signals, the latter comprising identical sets of antenna elements, each antenna element comprising a biquad-like radiating element in rectilinear polarization vertical, the antenna elements of each set being interconnected with each other so that each feeding center is on a common circle and the feed centers of two adjacent radiating elements being separated by a wavelength ⁇ of job.
  • This antenna comprises at least two sets of interconnected antenna elements, each of these sets comprising a radiating element whose feed center is aligned on the same line with the feed center of a radiating element included in each other sets of interconnected antenna elements thus forming groups of radiating elements, two adjacent power centers of a group of radiating elements being distant from each other by a distance substantially equal to 2 ⁇ / 3.
  • This omnidirectional antenna already performing in vertical opening, however offers a fairly modest gain of 4dBi.
  • the present invention aims to provide an omnidirectional antenna, preferably used in the maritime field, this antenna, while being simple in its implementation and a non-prohibitive cost, to overcome the disadvantage of the state of the art .
  • the antenna according to the invention is characterized in that the feed centers of two adjacent radiating elements, of the same set, are separated by a distance equal to 0, 9375 wavelength ⁇ working so that this antenna resonates on the bandwidth of the Wifi.
  • the antenna according to the invention comprises two sets of interconnected antenna elements as described above.
  • each set comprises an identical number of interconnected antenna elements usually from 2 to 8, in particular from 2 to 4 and, preferably, 4 interconnected antenna elements.
  • the feeding centers within the same set of interconnected antenna elements are located in a common circle and each feeding center is equidistant from the two adjacent feeding centers. Accordingly, when the assembly in question comprises four interconnected antenna elements, therefore four radiating elements, the feed centers of these radiating elements are arranged on a common circle at the intersection of two orthogonal diameters.
  • each set of interconnected antenna elements comprises a a radiating element whose feed center is aligned on the same line with the feed center of a radiating element included in each of the other sets of interconnected antenna elements thus forming groups of radiating elements.
  • each of these groups are coplanar and separated so that each side of the quadrilaterals of a radiating element is parallel to the corresponding side of the other radiating element (s) of the group, the respective supply centers being aligned along a straight line. cutting no quadrilateral.
  • the power centers of the same group of radiating elements are distant from each other sufficiently and appropriately to avoid a maximum of interference.
  • two adjacent feed centers of a group of radiating elements are spaced from each other by a distance substantially equal to 2 ⁇ / 3.
  • each set comprises antenna elements which each comprise a radiating element or radiator consisting of a double continuous loop taking the geometric form of two squares, with a common vertex, situated in the same plane and whose perimeter is substantially equal to two wavelengths (2 ⁇ ).
  • Such a radiating element may be designated later in the description as in the claims by the name "biquad”.
  • This radiating element is usually made from a wire, advantageously copper, disposed at a small distance from the reflector to which it is attached.
  • this wire is replaced by a printed circuit on a dielectric or insulating support panel, the printing being carried out according to known methods.
  • This support panel is usually made of a laminated panel formed of a fiberglass reinforced epoxy composite. Such a panel is generally thin, preferably less than 2 mm. Usually, a single support panel is used to print the radiating elements of a group.
  • the different radiating elements of the same assembly are connected via their respective power centers to a coupler via a coaxial power supply cable.
  • the interconnection of the radiating elements belonging to a set may comprise from 2 to 8, in particular from 2 to 4 and preferably 4 radiating elements as described above.
  • the radiating elements of the same group are associated with a single reflector forming a support panel for this group of radiating elements.
  • This reflector is formed of a metal plate generally made of copper or aluminum. Steel, especially stainless steel or polychlorinated biphenyl (“PCB”) can be used as well. In this case, and in known manner, it may be advantageous to solder an electrically conductive metal, for example copper, to the orifice of the coaxial channel orifice provided in this reflector, so as to ensure a good physical and electrical connection.
  • PCB polychlorinated biphenyl
  • the antenna according to the invention comprises two sets of antenna elements each comprising four interconnected radiating elements each associated with a reflector.
  • the sets of antenna elements thus formed are interconnected via the individual coupler connecting together the radiating elements of the same set each individual coupler being connected to a common coupler itself connected to a router.
  • This interconnection, as well as the interconnection of the radiating elements of a set of antenna elements and the tracing pattern of the different biquads, can be performed after studying the desired characteristics of radiation. This study can be carried out by experimentation in anechoic chamber and in real situation, for example at sea, so as to determine the best compromise between the gain and the spatial opening of the antenna according to the invention.
  • the antenna according to the invention described above finds its use preferentially but not exclusively in the maritime field. She allows to generate a sufficient opening when used for example under normal wave conditions (3 m of wave recesses). Thus, the gain goes up to 5dBi on average for a vertical opening of 35 ° as recorded during tests carried out for a transmission of 1.2 M bits over a distance of 2.9 km. During this test, the transmission was carried out using a WiFi router 54 Mbits in 802.11B mode integrated in this antenna.
  • the sets of antenna elements are arranged to work in the MIMO configuration, these sets of antenna elements being interconnected via the an individual coupler interconnecting the radiating elements of the same assembly, each individual coupler being connected to a Wifi router technology N so that said antenna rectifies the space differences between two antennas of the same type by choosing the best wave path.
  • this antenna comprises two sets of antenna elements each comprising for example four antenna elements. These two sets of antenna elements can be connected, for example to a type N300 Wifi router with two inputs / outputs.
  • this MIMO antenna is able to rectify, by choosing the best wave path, the effects of space diversity between two antennas of the same type.
  • the use of the N mode or differential mode provides an improvement over the vertical rectilinear propagation of the antenna: the two sets of antenna elements can operate on the same vertical plane, in interconnection or in the following separate mode, that in sea, the swing of the swell is strong or not.
  • the separation of the two sets of antenna elements in question gives an optimal position for a MIMO configuration: each set reacts according to the diversity of space between two antennas of the same type and selects the most appropriate aperture.
  • the antenna thus produced may offer the router a vertical aperture varying between 43 ° and 35 ° depending on the amplitude of the swell and whether the two sets of antenna elements in question are used interconnect or in isolation .
  • the antenna according to the invention comprises, fixed along the outer edges of each reflector supporting a group of radiating elements, an angle of length equal to a wavelength ⁇ and side substantially equal to 1 cm which allows a uniformization of the radiation in the horizontal plane. These angles, thus added, serve to standardize the diagram on the horizontal plane at -2dB.
  • the antenna according to the invention comprises a first set of antenna elements or "lower set” formed of four biquad-type radiating elements 1 fixed on an insulating support 2 and whose feed centers 3 are located substantially in a same plane and a second set of antenna elements or "upper assembly” formed of four radiating elements also biquad type fixed on an insulating support 2a and whose feed centers 3a are also located in the same plan.
  • the four feeding centers 3 are located on a common circle C and at the points of intersection, with this circle, of two orthogonal diameters as well as the four centers 3a are also arranged on a common circle and also located at the points of intersection, with this circle, of two orthogonal diameters.
  • the rope underlying the arc between two adjacent feed centers 3 of the lower set or between two adjacent feed centers 3a of the upper set is equal to 0.9375 wavelength ⁇ .
  • the biquads of each set are tangent to the common circle passing through their feeding centers.
  • the radiating elements 1 of the lower assembly and the radiating elements 1a of the upper assembly form, when taken together, four groups of radiating elements 1; 1a, each group being arranged on a single insulating support resulting in fact from the melting of an insulating support 2 with an insulating support 2a.
  • the feed centers of two adjacent radiating elements of the same group are isolated from each other by a distance equivalent to 2 ⁇ / 3.
  • These biquads radiating elements 1 and 1a are in the form of circuits, corresponding to copper tracks, printed on the single insulating support 2; 2a FR4 type epoxy glass.
  • each insulating support 2; 2a is itself fixed, at a precise distance and by means of insulators 4, nylon or teflon, a reflector 5 consists of an aluminum plate AG4MC type.
  • the four metal plates 5 attached to a base plate 6 of aluminum or fiberglass thus form the basic structure of the antenna according to the invention which is covered with a cap 7 for reinforcing this structure.
  • FIGS. 2 and 3 also show that the radiating elements of each set are interconnected by means of four-way couplers indicated respectively 8 and 8a, these two couplers themselves being interconnected via the two-way coupler 9. It is further observed that the output of this two-way coupler is also connected to a spark arrester 10 calibrated to 2.46 Mhz itself connected to the ground and each edge of the reflectors 5 is provided with an angle 14. L 'antenna thus described also incorporates a WiFi router 54 Mbits in 802.11B mode (not shown).
  • the antenna according to the invention is manufactured by first welding an SMA / KYB3 type connector at the feed center of each biquad element after having previously pierced the insulating supports 2; 2a.
  • prefabricated coaxial cables ending in a copper strand welded laterally to the ground, which must slightly protrude at its end, are used.
  • the four insulating supports 2 are assembled; 2a carriers of the radiating elements 1 in the form of printed circuits and on the respective faces of the four metal plates by means of insulators 4, threaded screws and nylon nuts.
  • two of the four reflectors 5 are fixed on the base plate 6, in this case two opposite reflectors.
  • the four-way couplers which are connected to the connectors of the different radiating elements associated with the two plates 5 in question are inserted, namely the coupler 8 to the radiating elements 1, the coupler 8a to the radiating elements 1a and the coupler 9 is connected to two channels to two four-way couplers.
  • the output 11 of the two-way coupler is then connected to a coaxial antenna output cable terminated by a female SMA element which is fixed to the base plate 6 via the surge arrester 10 riveted thereto.
  • the two radiating elements associated with the two remaining metal plates are then connected to the two four-way couplers by riveting them to the base plate as well as to the first two metal plates.
  • the assembly is completed by fixing a consolidation cover 12 to the four reflectors 5, covering this assembly with a cap 7 which is is secured to the base plate 6 and placing a seal 13.
  • This antenna is produced as described in Example 1, however, replacing the two-way coupler 9 by a WiFi router type N300 provided with two inputs / outputs connected directly to the four-way couplers 8; 8a (not shown), for example, a WiFi 802.11 dual amplified router b / g / n.
  • the antenna according to the invention has proved to be usable in the 2.4 GHz band for Wi-Fi applications, particularly in the maritime domain. On the other hand, it offers a vertical beam opening much higher than current market standards. This antenna thus makes it possible to overcome the movements generated by the swell and to guarantee the maintenance of the signal under extreme conditions. In addition, the antenna in question offers the possibility of reliably transmitting data or video, in point-to-point or point-to-multipoint mode, and is a solution of choice for establishing long-term Wi-Fi links. distance between vessels, offshore platforms, port infrastructures, marinas or other. Under optimal conditions, for example by calm sea, the range of this antenna is at least 13 km or 19 km while in extreme weather conditions, such as heavy snow, this range is around 2 to 3 km. On the other hand, its easy realization and especially its very low cost allow, on the antenna according to the invention, to validly compete with a fiber optic data transmission technology of the ADSL type.

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  • Aerials With Secondary Devices (AREA)
EP12447022.0A 2012-11-20 2012-11-20 Monoband-Rundstrahler Withdrawn EP2733788A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP12447022.0A EP2733788A1 (de) 2012-11-20 2012-11-20 Monoband-Rundstrahler

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP12447022.0A EP2733788A1 (de) 2012-11-20 2012-11-20 Monoband-Rundstrahler

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EP2733788A1 true EP2733788A1 (de) 2014-05-21

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EP12447022.0A Withdrawn EP2733788A1 (de) 2012-11-20 2012-11-20 Monoband-Rundstrahler

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4479127A (en) * 1982-08-30 1984-10-23 Gte Products Corporation Bi-loop antenna system
EP1523062A1 (de) * 2003-10-07 2005-04-13 Philippe Herman Rundstrahlende Antenne zum Senden und Empfangen von Audio/Video Signalen
EP2226896A1 (de) 2009-03-04 2010-09-08 Philippe Herman Multiband-Rundstrahler

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4479127A (en) * 1982-08-30 1984-10-23 Gte Products Corporation Bi-loop antenna system
EP1523062A1 (de) * 2003-10-07 2005-04-13 Philippe Herman Rundstrahlende Antenne zum Senden und Empfangen von Audio/Video Signalen
EP2226896A1 (de) 2009-03-04 2010-09-08 Philippe Herman Multiband-Rundstrahler

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
POT M: "Biquad Antenna Construction", INTERNET CITATION, 2 May 2003 (2003-05-02), XP002268769, Retrieved from the Internet <URL:http://martybugs.net/wireless/biquad/> [retrieved on 20040202] *

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