EP3022802B1 - Antenne de type bouchon et structure antennaire et ensemble antennaire associés - Google Patents

Antenne de type bouchon et structure antennaire et ensemble antennaire associés Download PDF

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Publication number
EP3022802B1
EP3022802B1 EP14739168.4A EP14739168A EP3022802B1 EP 3022802 B1 EP3022802 B1 EP 3022802B1 EP 14739168 A EP14739168 A EP 14739168A EP 3022802 B1 EP3022802 B1 EP 3022802B1
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EP
European Patent Office
Prior art keywords
conductive pattern
antenna
pattern
carrier substrate
conductive
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.)
Active
Application number
EP14739168.4A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3022802A1 (fr
Inventor
Jean-Philippe Coupez
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.)
IMT Atlantique Bretagne
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IMT Atlantique Bretagne
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Publication of EP3022802A1 publication Critical patent/EP3022802A1/fr
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
    • H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
    • H01Q1/362—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith for broadside radiating helical antennas
    • 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
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/52—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure
    • H01Q1/521—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure reducing the coupling between adjacent antennas
    • H01Q1/523—Means for reducing coupling between antennas; Means for reducing coupling between an antenna and another structure reducing the coupling between adjacent antennas between antennas of an array
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q11/00—Electrically-long antennas having dimensions more than twice the shortest operating wavelength and consisting of conductive active radiating elements
    • H01Q11/02—Non-resonant antennas, e.g. travelling-wave antenna
    • H01Q11/08—Helical antennas
    • 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 radio-frequency antennas, in particular those that can be used in wireless radio communication systems.
  • the antenna is an essential element of a wireless radio communication device.
  • Antenna solutions that are particularly efficient in terms of size, volume and weight are therefore sought, in particular for antenna solutions intended for applications in the VHF or UHF frequency ranges.
  • the document GB 2 292 638 A discloses an antenna formed from a cylindrical dielectric bar (of high relative dielectric permittivity - greater than 5), said bar being hollowed out to allow the passage of a feed structure.
  • the antenna comprises a plurality of radiating elements on the outer surface of the bar, the radiating elements being connected in parallel between the power supply and a ground plane.
  • the invention proposes a compact antenna solution which is easily realizable.
  • the invention provides an antenna as described in claim 1.
  • the invention proposes an antenna comprising a ground plane and an antenna structure according to the first aspect of the invention arranged above said ground plane, the lower end of the first conductive pattern being connected to the mass.
  • the antenna of the invention further comprises an excitation probe suitable for powering the antenna structure, the excitation probe being connected via the central conductor of said excitation probe to the first conductive pattern via a point of connection located along the first conductive pattern on the peripheral wall.
  • the invention proposes an antenna assembly comprising a ground plane; a plurality of identical antenna structures according to the first aspect of the invention, an excitation probe connected via the central conductor of said excitation probe to the first conductor pattern of a single antenna structure among the plurality of antenna structures , said antenna structure as well field defining a primary element for the antenna assembly, the at least other antenna structure defining at least one unpowered “passive” secondary element.
  • the antenna of the invention has extremely small dimensions with respect to the wavelength of the signal (that is to say of the order of ⁇ /50, or even less than this value).
  • the invention makes it possible to have an extremely compact antenna or antenna assembly for a fixed operating frequency.
  • the invention offers a very great simplicity of performance adjustment.
  • the operating frequency is particularly easy to adjust since it is a function of the value of the developed length of the first conductive pattern, as well as of the form factor and of the dimensions chosen for the second conductive pattern.
  • the level of adaptation of the antenna of the invention can also be easily optimized by an appropriate choice of the position of the excitation point on the first pattern vis-à-vis the lower end of the first pattern, itself connected to ground.
  • the invention makes it possible to have an antenna solution or an antenna assembly which is very easy to produce at low cost.
  • the partially hollowed-out substrate S comprises a peripheral side wall S1 which extends between a proximal end S2 and a distal end S3. Furthermore, the support substrate S defines an internal volume S4 which can be partially filled with dielectric material. The internal volume S4 is thus surrounded by the peripheral wall S1.
  • the support substrate S can be a dielectric material of the plastic or plastic foam type, the electrical characteristics of which are preferably very close to those of air, or even simply be air.
  • the relative dielectric permittivity of the support substrate S is preferably close to 1, ie between 1 and 1.5.
  • the first pattern M1 is inscribed on the peripheral side wall S1 of the support substrate S and comprises a lower end Einf adapted to be connected to the ground plane M and an upper end Esup.
  • the second conductive pattern M2 is configured to be contained in the volume S4 of the substrate S and is electrically connected to the upper end Esup of the first pattern M1.
  • the second pattern M2 is preferably produced on a three-dimensional surface. This is typically a patch conductive pattern.
  • the three-dimensional surface can be a surface of the substrate S or a surface of a distinct element inserted into the volume S4.
  • the second conductive pattern M2 is also configured to close off the distal end S3 of the support substrate S like a cap.
  • the antenna comprises a coaxial excitation probe 10 whose central conductor 11 is connected to a point P of the first conductive pattern M1 on the peripheral wall S1 of the support S.
  • the first pattern M1 can take several forms.
  • THE figures 3a , 3b and 3c illustrate developed views of the peripheral side wall S1 of the support substrate S with several shapes for the first pattern M1: multi-turn helix ( picture 3a ), multi-meander geometry ( figure 3b ) or any form ( figure 3c ). It can also be a combination of rectilinear(s) and sinuous(s) shapes or else in the shape of a fractal(s) pattern(s) (not shown) or of a sinusoidal shape (not shown).
  • the first conductive pattern M1 can be either a conductive thread or else a conductive tape.
  • the diameter of the conductive wire is between 0.25mm and 5mm, preferably 1mm.
  • the second pattern M2 can also take several forms.
  • THE figures 4a, 4b, 4c, 4d, 4e, 4f, 4g and 4h illustrate the shapes of the transverse profile for the second pattern M2: straight ( figure 4a ), niche ( figure 4b ), succession of straight lines ( figures 4c and 4e ), successions of straight and curved lines ( figures 4d and 4f ), succession of curved lines ( figures 4g and 4h ).
  • the second pattern M2 may have a part which extends inside the internal volume S4 of the support substrate S towards the proximal end S2 of the support substrate S.
  • the support substrate S is cylindrical in shape and the first conductive pattern M1 is helical.
  • the support substrate S is a cylinder of revolution whose cross section is equal to a disk of diameter d ⁇ ⁇ and whose height is equal to h ⁇ ⁇ (with ⁇ the wavelength associated with the frequency operation of the corresponding antenna).
  • the first pattern M1 comprises several turns wound on the peripheral side wall S1 of the support substrate S.
  • the second pattern M2 is here of the pellet type inscribed in its entirety inside the volume S4 defined by the support substrate S.
  • the collar C' takes the form here of an annular conductive pattern of outer diameter d and of inner diameter d' (with 0 ⁇ d' ⁇ d), completed by a section C of conductive tube of diameter d and height h ' (with 0 ⁇ h' ⁇ h), blocked at its base by the bottom C" in the form of a conductive disc with a diameter of '.
  • the second conductive pattern M2 blocks the entire part top of the support substrate S.
  • section C extends in the internal volume S4 defined by the support substrate S and the bottom C" is contained inside this same volume.
  • the second pattern M2 comes as an inverted hat above the support substrate S with a part (i.e. the section C and the bottom C") inserted inside the internal volume of the support substrate S
  • the inverted hat thus forms the three-dimensional support.
  • the antenna is said to be of the plug type.
  • the first and second conductive patterns M1, M2 are electrically connected: the second pattern M2 is in particular electrically connected to the upper end Esup of the first conductive pattern M1.
  • a radiating element constituted by the association of the first conductive pattern M1 and the second conductive pattern M2 is contained in a cylindrical volume, with a diameter equal to 30mm and a height of 20mm .
  • Such an antenna can be used for applications developed at VHF and UHF frequencies.
  • the invention relates to an antenna comprising an antenna assembly and a ground plane M; a plurality of identical antenna structures Ai (i ⁇ 2) as described above and an excitation probe 10 connected to a point P of the first conductive pattern M1 of a single antenna structure among the plurality of antenna structures A1, A2 , so as to supply an antenna structure.
  • the antenna structure thus excited defines a primary element for the antenna assembly, the at least other antenna structure defining at least one unpowered “passive” secondary element.
  • the antenna assembly comprises an antenna and at least one antenna structure which acts as a parasitic element located close to the antenna.
  • the antenna assembly has a widened passband.
  • FIG 8 illustrates an antenna assembly comprising two antenna structures A1, A2 arranged one beside the other.
  • the configuration consists in associating a first and a second antenna structure A1, A2, positioned relative to each other at a very short distance D relative to the wavelength of the signal ⁇ , and this in order to keep the overall dimensions for the antenna assembly particularly small.
  • the distance D between the two structures (that is to say the distance between the central axes of symmetry of the structures A1 , A2) is 70mm, or about ⁇ /22 (hence D ⁇ ⁇ ). Note that this very close proximity between the structures is made possible by the miniature character of the antenna structures used (the size of the antenna structures is of the order of ⁇ /52).
  • the first antenna structure A1 supplied by the coaxial excitation probe 10 plays the role of a primary radiating element, supplied at a connection point P by the central conductor 11 of the excitation probe 10.
  • the first antenna structure A1 powered is electromagnetically coupled to the second antenna structure, of identical configuration, but which is, for its part, not powered.
  • This second antenna structure consequently plays the role of a “passive” secondary element, initially operating at the same resonance frequency as the first antenna structure A1 and positioned in its close environment, in order to be physically coupled to it.
  • the electrical response obtained on the first antenna structure A1 is then of the dual-frequency type, with frequency values relatively close to each other.
  • the frequency difference is a function of the value of the coupling level existing between the first antenna structure A1 and the second antenna structure A2. The more this level decreases, the closer the frequencies get.
  • the level of the first antenna structure A1 coupled to the second antenna structure A2 we therefore obtain, ultimately, a response equivalent to that of a two-pole bandpass filter, which leads to a significant widening of the passband compared to that which would be obtained if only the first antenna structure were used.
  • the two resonance frequencies involved in the electrical response must be very close to each other, which leads, a priori, to fixing a level of coupling between the antenna structures A1, A2 that is very low.
  • This condition can be satisfied very simply by increasing the distance D between the two antenna structures, but to the detriment of the compactness of the antenna assembly.
  • the reduction in coupling can be simply obtained thanks to the presence of an electric screen between the two antenna structures A1, A2, this screen being able to be produced, for example, by the use of a conductive wall 100 electrically connected at its base to the ground plane, as illustrated in the figure 9 .
  • the position of the conductive wall 100, as well as its geometry and its dimensions make it possible to adjust the value of the coupling and therefore to finely control the shape of the electrical response in the passband.
  • the basic principle then consists in constructing at the level of the primary element an electrical response of the multi-pole bandpass filter type by exploiting the coupling of this primary element A1 with all the others “passive” secondary elements Ai (i>1).
  • the number n of antenna structures, their geometric arrangement on the ground plane, as well as the number, positions and characteristics of the conductive walls constitute parameters of freedom with regard to the design and optimization of such a structure. antennal assembly.
  • the figure 10 illustrates an antenna assembly comprising three antenna structures A1, A2, A3 arranged on the ground plane M in a triangular manner and comprising two conductive walls.
  • This prototype corresponds to the association of two antenna structures such as the antenna of the embodiment illustrated in the figure 5a .
  • each antenna structure of this prototype is ⁇ /52.
  • the antenna assembly operates at a frequency of 193 MHz.
  • the two antenna structures are separated by a distance D of 70mm, i.e. ⁇ /22 and the electrical screen enabling the level of coupling between the two elements to be controlled is a simple rectangular conductive wall of dimensions 30 ⁇ 70mm 2 , positioned between the two antennal structures.

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  • Details Of Aerials (AREA)
EP14739168.4A 2013-07-15 2014-07-15 Antenne de type bouchon et structure antennaire et ensemble antennaire associés Active EP3022802B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1356954A FR3008550B1 (fr) 2013-07-15 2013-07-15 Antenne de type bouchon et structure antennaire et ensemble antennaire associes
PCT/EP2014/065176 WO2015007746A1 (fr) 2013-07-15 2014-07-15 Antenne de type bouchon et structure antennaire et ensemble antennaire associés

Publications (2)

Publication Number Publication Date
EP3022802A1 EP3022802A1 (fr) 2016-05-25
EP3022802B1 true EP3022802B1 (fr) 2023-04-05

Family

ID=49998316

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14739168.4A Active EP3022802B1 (fr) 2013-07-15 2014-07-15 Antenne de type bouchon et structure antennaire et ensemble antennaire associés

Country Status (6)

Country Link
US (1) US10944163B2 (zh)
EP (1) EP3022802B1 (zh)
CN (1) CN105556748B (zh)
FR (1) FR3008550B1 (zh)
HK (1) HK1223455A1 (zh)
WO (1) WO2015007746A1 (zh)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3285333A1 (en) 2016-08-16 2018-02-21 Institut Mines Telecom / Telecom Bretagne Configurable multiband antenna arrangement and design method thereof
EP3340379A1 (en) 2016-12-22 2018-06-27 Institut Mines Telecom / Telecom Bretagne Configurable multiband antenna arrangement with wideband capacity and design method thereof
EP3503293A1 (en) 2017-12-19 2019-06-26 Institut Mines Telecom - IMT Atlantique - Bretagne - Pays de la Loire Configurable multiband wire antenna arrangement and design method thereof
EP3503294A1 (en) 2017-12-22 2019-06-26 Institut Mines Telecom - IMT Atlantique - Bretagne - Pays de la Loire Configurable multiband antenna arrangement with a multielement structure and design method thereof
EP3591761A1 (en) 2018-07-06 2020-01-08 Institut Mines Telecom - IMT Atlantique - Bretagne - Pays de la Loire Multiband antenna arrangement built to a specification from a library of basic elements

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Also Published As

Publication number Publication date
EP3022802A1 (fr) 2016-05-25
FR3008550A1 (fr) 2015-01-16
US10944163B2 (en) 2021-03-09
CN105556748A (zh) 2016-05-04
HK1223455A1 (zh) 2017-07-28
FR3008550B1 (fr) 2015-08-21
US20160156095A1 (en) 2016-06-02
WO2015007746A1 (fr) 2015-01-22
CN105556748B (zh) 2019-06-04

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