EP3605730B1 - Antennenvorrichtung mit zwei verschiedenen und schneidenden planaren substraten - Google Patents

Antennenvorrichtung mit zwei verschiedenen und schneidenden planaren substraten Download PDF

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Publication number
EP3605730B1
EP3605730B1 EP19189713.1A EP19189713A EP3605730B1 EP 3605730 B1 EP3605730 B1 EP 3605730B1 EP 19189713 A EP19189713 A EP 19189713A EP 3605730 B1 EP3605730 B1 EP 3605730B1
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EP
European Patent Office
Prior art keywords
substrate
electrically conductive
antenna
face
antenna device
Prior art date
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EP19189713.1A
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English (en)
French (fr)
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EP3605730A1 (de
Inventor
Jean-François PINTOS
Christophe Delaveaud
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Commissariat a lEnergie Atomique et aux Energies Alternatives CEA
Original Assignee
Commissariat a lEnergie Atomique CEA
Commissariat a lEnergie Atomique et aux Energies Alternatives CEA
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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
    • H01Q15/0006—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices
    • H01Q15/006—Selective devices having photonic band gap materials or materials of which the material properties are frequency dependent, e.g. perforated substrates, high-impedance surfaces
    • H01Q15/008—Selective devices having photonic band gap materials or materials of which the material properties are frequency dependent, e.g. perforated substrates, high-impedance surfaces said selective devices having Sievenpipers' mushroom elements
    • 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
    • H01Q1/526—Electromagnetic shields
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q19/00—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic
    • H01Q19/10—Combinations of primary active antenna elements and units with secondary devices, e.g. with quasi-optical devices, for giving the antenna a desired directional characteristic using reflecting surfaces
    • 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
    • H01Q5/40—Imbricated or interleaved structures; Combined or electromagnetically coupled arrangements, e.g. comprising two or more non-connected fed radiating elements
    • H01Q5/45—Imbricated or interleaved structures; Combined or electromagnetically coupled arrangements, e.g. comprising two or more non-connected fed radiating elements using two or more feeds in association with a common reflecting, diffracting or refracting device
    • 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 relates to an antenna device with two different intersecting planar substrates.
  • the second substrate is generally used to electromagnetically isolate the first radiating portion of the first substrate from the second non-radiating portion for electrical connection, for example by deploying a metallic ground plane of the side of the radiating portion.
  • electromagnetic interference between the support and the second substrate are capable of exciting at least one electromagnetic resonance mode specific to the second substrate.
  • These interferences then generate, via the own electromagnetic resonance mode(s) possibly excited in the bandwidth of the radio antenna which extends in the first radiating portion of the first substrate, a disturbance of the radiation of the latter. This disturbance affects the performance of the antenna device.
  • a technical solution to reduce or cancel such a disturbance consists of adding short circuits between the metallic ground plane of the second substrate and the metallic support. But this solution is not possible in many numerous concrete applications with compact structures in which integration constraints do not allow such additions.
  • the document WO 2017/056437 A1 discloses an antenna device with two different and intersecting planar substrates as described above, in which a metamaterial structure is also present on the upper face of the second substrate.
  • the documents US 2005/0168394 A1 And EP 0 945 917 A2 each disclose an antenna device with two different and intersecting planar substrates as described above.
  • the document US 7,142,822 B2 discloses a radio frequency circuit substrate having a metamaterial structure.
  • Said at least one radio antenna is at least one printed antenna extending over at least one face of the first substrate.
  • Said at least one radio antenna comprises a first antenna printed at low frequencies operating in a first electromagnetic frequency band and a second antenna printed at high frequencies operating in a second electromagnetic frequency band all higher than the electromagnetic frequencies of the first frequency band.
  • metamaterial structures are known to generate multiple modes of electromagnetic resonances, or even to increase the number of resonances in cavities, as for example taught in the article by Seetharamdoo et al, entitled “Investigation on the use of metamaterials to lower the operating frequency of reverberation chamber”, published at the EMC Europe 2011 conference York (UK), September 26-30, 2011 (pages 680 to 685 of the Proceedings ), it was observed surprisingly that the addition of a metamaterial structure on the face of the second substrate oriented towards the second half-space is able to protect and electromagnetically isolate the first half-space in which the radio antenna in the particular structure of this type of antenna device.
  • the electrically conductive elements of the metamaterial structure are arranged in a matrix on the lower face of the second substrate.
  • electrical connection pins are arranged between the first and second substrates for an electrical junction of at least part of the electrically conductive means of connection to the metallic ground plane.
  • said at least part of the electrically conductive connection means comprises a portion of metallic ground plane formed in the first substrate.
  • the second substrate has an opening, for example a rectilinear hole, through which the first substrate passes.
  • the first and second substrates are arranged orthogonally.
  • the antenna device 10 shown schematically in front view on the figure 1 comprises a first substrate 12 which extends in a first plane, that of the figure. It further comprises a second substrate 14 which extends in a second plane different and intersecting the first plane, in particular a horizontal plane orthogonal to that of the figure.
  • the second substrate 14 has an opening, for example a rectilinear hole, crossed by the first substrate 12, so that the latter has a first portion 16, located in a first upper half-space relative to the second plane of the second substrate 14, and a second portion 18, located in a second half -lower space relative to the second plane of the second substrate 14.
  • the two substrates are for example made of FR-4 type material (from the English "Flame Resistant 4"), that is to say an epoxy resin composite reinforced with fiberglass.
  • two radio antennas 20 and 22 are formed by metal printing using known screen printing technology.
  • the larger of the two radio antennas i.e. the first printed antenna 20, comprises two metal strips 20A, 20B extending orthogonally from the second plane. These two metal strips 20A, 20B form two feet connected together at their ends most distant from the second plane by a portion of additional metal strip, as well as to another metal strip 20C extending horizontally in the upper part of the first portion radiant 16 of the first substrate 12.
  • the precise configuration of this first printed antenna 20, located furthest to the left on the front face of the first substrate 12, as well as its dimensioning remain concretely up to the appreciation of those skilled in the art depending on the application, impedance matching and targeted radiation. It operates at low frequencies, in a first band of predetermined electromagnetic frequencies.
  • the smaller of the two radio antennas, ie the second printed antenna 22, also includes two metal strips 22A, 22B extending orthogonally from the second plane. These two metal strips 22A, 22B are shorter than the metal strips 20A, 20B. They also form two feet connected together at their ends most distant from the second plane by a portion of additional metal strip, as well as to another metal strip 22C extending horizontally under the metal strip 20C in the first radiating portion 16 of the first substrate 12. The metal strip 22C is shorter than the metal strip 20C.
  • the precise configuration of this second printed antenna 22, located furthest to the right on the front face of the first substrate 12, as well as its dimensioning remain concretely up to the appreciation of those skilled in the art depending on the application, the adaptation impedance and radiation targeted. It operates at high frequencies, in a second band of predetermined electromagnetic frequencies, for example all higher than the electromagnetic frequencies of the first frequency band of the first printed antenna 20.
  • electrically conductive means for connecting the two radio antennas 20 and 22 to an electronic transmission circuit and/or reception are formed in particular by metal printing using the aforementioned screen printing technology.
  • these conductive connection means comprise a metallic ground plane portion 24 formed by metallic printing on the front face of the second lower portion 18 of the first substrate 12.
  • each antenna must first be shaped so as to ensure impedance matching with the electronic transmission and/or reception circuit, then must be respectively connected to the electronic transmission and/or reception circuit and to the plane portion of metallic mass 24 by its two feet.
  • the connection of the first printed antenna 20 to the metal ground plane portion 24 is thus carried out by its antenna base 20A according to known means, not detailed in the figure 1 , which are not necessarily arranged only on the front face of the first substrate 12.
  • the connection of the first printed antenna 20 to the electronic transmission and/or reception circuit is represented symbolically by a first connector block 26.
  • the connection of the second printed antenna 22 to the metallic ground plane portion 24 is made by its antenna base 22A: this can for example be done by continuity of metallic printing on the front face of the first substrate 12.
  • connection of the second antenna 22 printed on the metal ground plane portion 24 is for its part represented symbolically by a second connector block 28.
  • the electronic transmission and/or reception circuit is generally located in the second half -lower space relative to the second plane of the second substrate 14, but is not shown on the figure 1 because it is not useful for a good understanding of the invention.
  • the second substrate 14 has a face, called the upper face because it is that which is oriented towards the first upper half-space in which the two radio antennas 20 and 22 are located, on which a ground plane 30 is formed by metal print. Thanks to the presence of the rectilinear hole crossed by the first substrate 12, the ground plane 30 is not in direct electrical contact with the two radio antennas 20 and 22. Contact is established using electrical connection pins whose two pairs 32 and 34 are represented on the figure 1 . A first pair of pins 32 is arranged in the vicinity of the feet of the first printed antenna 20.
  • It comprises two pins, electrically connected to each other using male and female elements in a manner known per se, one of which is arranged and connected electrically to the metallic ground plane portion 24 of the first substrate 12 and the other to the ground plane 30 of the second substrate 14.
  • a second pair of pins 34 is arranged in the same way in the vicinity of the feet of the second printed antenna 22
  • Other electrical connection pins can be added for the connection of other elements, for example elements of the electronic transmission and/or reception circuit, to the ground plane 30 of the second substrate 14.
  • the second substrate 14 has a face opposite its upper face, called the lower face, oriented towards the second lower half-space in which the second lower portion 18 of the first substrate 12 is located, which is used to electromagnetically isolate the upper half-space from any electromagnetic interference due to the at least partial insertion of the second lower portion 18 of the first substrate 12 in a corresponding slot of a metal support 36 such as a cylindrical mast or candelabra.
  • This exploitation of the lower face of the second substrate 14 consists of deploying there, by metallic printing, a metamaterial structure 38 with multiple electrically conductive elements 40 electrically separated from each other on this lower face.
  • each electrically conductive element 40 of the metamaterial structure 38 is connected to the metallic ground plane 30 using a through metallic via 42 extending into the thickness of the second substrate 14.
  • the metamaterial structure 38 is dimensioned so as to eliminate at least one stationary mode of own electromagnetic resonance of the second substrate 14 capable of being excited by the proximity of the metal support 36, that is to say at least one stationary mode of current distribution capable of appearing in the ground plane 30 of the second substrate 14 at at least one frequency, in particular at least one frequency of the bandwidth of any one of the two antennas 20 and 22.
  • the second substrate 14 can simply be manufactured, with its ground plane 30 on the upper face and its metamaterial structure 38 on the lower face, from a substrate sold commercially with complete metallization on its two faces. It is then sufficient to remove part of the metallization according to the desired patterns on the upper and lower faces of the substrate 14.
  • the antenna device 10 in a protective housing 44 (shown transparent for better visibility of the device 10 on the figure 2 ), only at least part of the second lower portion 18 emerging from under the housing 44 for insertion into the metal support 36.
  • This is generally a plastic radome.
  • the figure 2 also illustrates conventional means 46 with lateral screws for fixing the radome 44 on the metal support 36 as well as the rectilinear hole 48 of the second substrate 14 crossed by the first substrate 12.
  • the Figure 3 further shows that the electrically conductive elements 40 of the metamaterial structure 38 can be square or rectangular in shape and arranged in a matrix on all or part of the lower face of the second substrate 14. This means that the electrically conductive elements 40 are arranged in lines and columns along two main axes, in particular according to a periodic or pseudo-periodic repetition (for example with increasing or decreasing dimensions of the patterns) along one of the two axes or both.
  • FIG. 4 illustrates in perspective an installation comprising the antenna device 10, integrated into the radome 44 and therefore not visible in this figure, as fixed by screwing on the metal support 36. It can be seen that the implementation of the present invention allows to maintain a very good compactness of the whole.
  • Tests were carried out for a first printed antenna 20 shaped and sized to operate in the passband [860; 865] MHz and for a second printed antenna 22 shaped and sized to operate in the bandwidth [2.4000; 2.4835] GHz.
  • FIG. 5A illustrates a curve of reflection coefficients S 11 measured at the input of each of the two antennas of the antenna device 10 when the latter does not include the metamaterial structure 38. Between 0.7 and 2 GHz, this is the evolution of the reflection coefficient S 11 of the first printed antenna 20. Between 2 and 3 GHz, this is the evolution of the reflection coefficient S 11 of the second antenna 22. This results in a complete break in the curve normal at 2GHz.
  • FIG. 5B illustrates another curve of reflection coefficients S 11 measured at the input of each of the two antennas of the same antenna device 10, but this time when the latter comprises the metamaterial structure 38 with electrically conductive elements 40 square of 11 mm from sides.
  • this is the evolution of the reflection coefficient S 11 of the first printed antenna 20.
  • this is the evolution of the reflection coefficient S 11 of the second printed antenna 22.
  • Point m1 now measures a coefficient S 11 - -17.3 dB at 860 MHz.
  • the point m2, measuring a coefficient S 11 -32.2 dB at 865 MHz, is no longer even apparent on the curve.
  • the reflection coefficients of the antennas 20 and 22 have significantly reduced values in the two pass bands [860; 865] MHz and [2.4000; 2.4835] GHz compared to the figure 5A , which demonstrates that the two antennas 20 and 22 have better transmission performances (ie reception and transmission) in the case of Figure 5B than in that of the figure 5A .
  • FIG. 6A illustrates a curve of total efficiency values measured for the second printed antenna 22 of the antenna device 10 when the latter does not include the metamaterial structure 38, between 2.35 and 2.5 GHz.
  • FIG. 6B illustrates another curve of total efficiency values measured for the second printed antenna 22 of the same antenna device 10 between 2.35 and 2.5 GHz, but this time when the latter comprises the metamaterial structure 38 with elements electrically conductive 40 squares of 11 mm sides.
  • the performance is more stable and better, in the bandwidth [2.4000; 2.4835] GHz, in the case of Figure 6B than in that of the Figure 6A .
  • an antenna device such as that described above makes it possible to preserve the radio performance of the antenna(s) it comprises while maintaining very good compactness, when this device is intended to be fixed on a metal support. likely to disturb it electromagnetically.
  • the functionalization of the lower face of the second substrate using a metamaterial structure makes it possible to reduce the interactions of the antenna(s) of the device with its immediate environment.
  • the aforementioned antennas 20 and 22 are printed using screen printing technology, but other types of antennas are compatible with the present invention.
  • antennas 20 and 22 are also printed on the same face of substrate, but antennas printed on two different faces of the same substrate are also suitable.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Optics & Photonics (AREA)
  • Details Of Aerials (AREA)
  • Support Of Aerials (AREA)

Claims (7)

  1. Antennenvorrichtung (10), beinhaltend:
    - ein erstes Substrat (12), das sich in einer ersten Ebene erstreckt und mindestens eine Fläche aufweist, auf der geformt sind:
    • mindestens eine Funkantenne (20, 22), die sich in einem ersten Strahlungsabschnitt (16) des ersten Substrats (12) erstreckt, und
    • elektrisch leitende Mittel (24, 26, 28) zum Anschließen der mindestens einen Funkantenne (20, 22) an eine elektronische Sende- und/oder Empfangsschaltung, wobei sich diese elektrisch leitenden Mittel (24, 26, 28) in einem zweiten Abschnitt (18) des ersten Substrats (12) erstrecken,
    - ein zweites Substrat (14), das sich in einer zweiten Ebene erstreckt, die die ersten Ebene schneidet und sich von dieser unterscheidet, und den ersten Strahlungsabschnitt (16) vom ersten Substrat (12) trennt, der sich in einem ersten Halbraum relativ zu dieser zweiten Ebene befindet, vom zweiten Abschnitt (18) des ersten Substrats (12), der sich in einem zweiten Halbraum relativ zu dieser zweiten Ebene befindet,
    wobei das zweite Substrat (14) eine Fläche aufweist, untere Fläche genannt, und zur Seite des zweiten Halbraums hin ausgerichtet ist, in dem sich die elektrisch leitenden Mittel zum Anschließen (24, 26, 28) befinden, die eine Metamaterialstruktur (38) mit mehreren elektrisch leitenden Elementen (40) beinhalten, die auf dieser unteren Fläche elektrisch voneinander getrennt sind,
    wobei die mindestens eine Funkantenne (20, 22) mindestens eine gedruckte Antenne ist, die sich über mindestens eine Fläche des ersten Substrats (12), erstreckt, wobei die mindestens eine Funkantenne eine erste gedruckte niederfrequente Antenne (20) beinhaltet, die in einem ersten elektromagnetischen Frequenzband arbeitet, und eine zweite gedruckte hochfrequente Antenne (22), die in einem zweiten elektromagnetischen Frequenzband arbeitet, dessen elektromagnetischen Frequenzen alle höher sind als die elektromagnetischen Frequenzen des ersten Frequenzbandes, wobei das zweite Substrat (14) aufweist:
    - eine metallische Massenebene (30), die sich über einer anderen Fläche erstreckt, obere Fläche genannt, und der unteren Fläche gegenüberliegt, die die Metamaterialstruktur (38) beinhaltet, und
    - durchgehende Vias (42), die jedes elektrisch leitende Element (40) der Metamaterialstruktur (38) an die metallische Massenebene (30) anschließen.
  2. Antennenvorrichtung (10) nach Anspruch 1, wobei die elektrisch leitenden Elemente (40) der Metamaterialstruktur (38) matrixartig auf der unteren Fläche des zweiten Substrats (14) angeordnet sind.
  3. Antennenvorrichtung (10) nach Anspruch 1 oder 2, wobei mindestens einer der Parameter der Anordnung, die aus:
    - einer Anzahl von elektrisch leitenden Elementen (40) der Metamaterialstruktur (38),
    - einer Verteilung elektrisch leitender Elemente (40) der Metamaterialstruktur (38) auf der unteren Fläche des zweiten Substrats (14),
    - mindestens einer Dimension jedes elektrisch leitenden Elements (40) der Metamaterialstruktur (38), und
    - Zwischenräumen zwischen elektrisch leitenden Elementen (40) der Metamaterialstruktur (38),
    besteht, so eingestellt ist, dass mindestens ein stationärer Modus elektromagnetischer Resonanz des zweiten Substrats (14) beseitigt wird.
  4. Antennenvorrichtung (10) nach einem der Ansprüche 1 bis 3, wobei Stifte (32, 34) zum elektrischen Anschluss zwischen dem ersten und dem zweiten Substrat (12, 14) angeordnet sind für einen elektrischen Übergang von mindestens einem Teil (24) der elektrisch leitenden Mittel zum Anschließen (24, 26, 28) an die metallische Massenebene (30) .
  5. Antennenvorrichtung (10) nach Anspruch 4, wobei der mindestens eine Teil (24) der elektrisch leitenden Mittel zum Anschließen (24, 26, 28) einen Abschnitt der metallische Massenebene beinhaltet, der im ersten Substrat (12) gebildet ist.
  6. Antennenvorrichtung (10) nach einem der Ansprüche 1 bis 5, wobei das zweite Substrat (14) eine Öffnung aufweist, beispielsweise ein geradliniges Loch (48), durch das das erste Substrat (12) verläuft.
  7. Antennenvorrichtung (10) nach einem der Ansprüche 1 bis 6, wobei das erste und das zweite Substrat (12, 14) orthogonal angeordnet sind.
EP19189713.1A 2018-08-02 2019-08-02 Antennenvorrichtung mit zwei verschiedenen und schneidenden planaren substraten Active EP3605730B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1857244A FR3084778B1 (fr) 2018-08-02 2018-08-02 Dispositif d'antenne a deux substrats plans differents et secants

Publications (2)

Publication Number Publication Date
EP3605730A1 EP3605730A1 (de) 2020-02-05
EP3605730B1 true EP3605730B1 (de) 2023-11-01

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KR100263181B1 (ko) * 1998-02-27 2000-08-01 윤종용 휴대용 무선 단말기 안테나
JP2004022587A (ja) * 2002-06-12 2004-01-22 Denso Corp 筐体
JP4234617B2 (ja) * 2004-01-30 2009-03-04 富士通コンポーネント株式会社 アンテナ装置
JP6763372B2 (ja) * 2015-04-02 2020-09-30 日本電気株式会社 マルチバンドアンテナ及び無線通信装置
US10396460B2 (en) * 2015-09-29 2019-08-27 Nec Corporation Multiband antenna and wireless communication device

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FR3084778B1 (fr) 2020-07-24
FR3084778A1 (fr) 2020-02-07

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