WO2012110215A1 - Antenne patch et procédé de réglage de fréquence d'une antenne patch de ce type - Google Patents

Antenne patch et procédé de réglage de fréquence d'une antenne patch de ce type Download PDF

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Publication number
WO2012110215A1
WO2012110215A1 PCT/EP2012/000588 EP2012000588W WO2012110215A1 WO 2012110215 A1 WO2012110215 A1 WO 2012110215A1 EP 2012000588 W EP2012000588 W EP 2012000588W WO 2012110215 A1 WO2012110215 A1 WO 2012110215A1
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WO
WIPO (PCT)
Prior art keywords
slot
transverse
patch antenna
antenna according
closed
Prior art date
Application number
PCT/EP2012/000588
Other languages
German (de)
English (en)
Inventor
Sandra KNÖRZER
Thomas Lankes
Gerald Schillmeier
Original Assignee
Kathrein-Werke Kg
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 Kathrein-Werke Kg filed Critical Kathrein-Werke Kg
Priority to EP12705978.0A priority Critical patent/EP2676326B1/fr
Publication of WO2012110215A1 publication Critical patent/WO2012110215A1/fr

Links

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
    • H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
    • H01Q9/0442—Substantially flat resonant element parallel to ground plane, e.g. patch antenna with particular tuning means
    • 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
    • H01Q1/2208—Supports; Mounting means by structural association with other equipment or articles associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems
    • 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
    • H01Q9/0407—Substantially flat resonant element parallel to ground plane, e.g. patch antenna
    • H01Q9/0428—Substantially flat resonant element parallel to ground plane, e.g. patch antenna radiating a circular polarised wave
    • 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
    • H01Q9/06—Details
    • H01Q9/14—Length of element or elements adjustable

Definitions

  • the invention relates to a patch antenna according to the preamble of claim 1 and to a method for frequency tuning of such a patch antenna according to the preamble of claim 17.
  • Patch antennas or so-called microstrip antennas are well known. They usually comprise an electrically conductive base area, a dielectric carrier material arranged above them and an electrically conductive radiation area provided on the upper side of the dielectric carrier material. The upper radiation surface is usually excited by a transverse to the above-mentioned planes and layers feed line.
  • a coaxial cable whose outer conductor is electrically connected at one connection to the ground conductor is used as connection cable, whereas the inner conductor of the coaxial cable is electrically connected to the overhead radiation surface.
  • Other forms of feeding such as aperture coupling, are also known and applicable.
  • the resulting frequency tuning is done by hand on Net zwerkanalysator. In this case, however, the axis ratio, the opening angle and other recognition variables are not measurable. The radiation properties of the antenna therefore vary over different patterns. It is therefore an object of the present invention to provide an improved patch antenna with an already prepared Nachrungsdorfkeit for frequency tuning, and an improved method for such frequency tuning.
  • the invention is based on the basic idea that, starting at the edge of the patch antenna, slits are made running inwardly in the material of the area radiator, but these are virtually “closed” via transversely extending, electrically conductive webs.
  • at least one recess is provided in the context of the invention of the relevant side edge of the patch antenna from inwardly extending, which is completed via at least one transverse web extending to the side edge or at the edge of the patch antenna.
  • the relatively small-sized recesses thus have virtually no influence on the radiation characteristic of such a patch antenna. In other words, such a patch antenna is comparable to a patch antenna without such recesses.
  • the respective webs can be removed from outside to inside as needed. If a plurality of closed recesses are provided one behind the other, which are separated from each other by a plurality of conductive webs, then a plurality of webs can also be removed stepwise from outside to inside. The more webs are removed from the slots, the deeper the resonant frequency of the antenna becomes.
  • the tuning option according to the invention and the tuning method according to the invention are suitable for patch antennas with one, two or more feed points.
  • the antenna according to the invention also makes it possible to tune the axis ratio (AR) by means of a virtually independent tuning of the two linear polarizations.
  • AR axis ratio
  • the spacings of the webs in the longitudinal direction of the slot formation can be equidistant.
  • the length of the individual recesses is perpendicular to the respective boundary edge, ie to the edge portion of the surface radiating element running the same length. But it is also possible that these distances are designed differently.
  • the distances of the individual webs from the inside outwards to the longitudinal or transverse boundary edge of the surface radiator with a square spacing increase.
  • the Abstimmstege are in their dimensions, as the individual recesses between the Abstimmstegen, relatively small compared to the wavelength at which the patch antenna in question is to be operated. This applies in particular even if the relevant patch antenna is to be used, for example, as an RFID antenna.
  • the invention can preferably be realized with a square patch antenna in plan view.
  • the patch antenna can also have any other outline shapes, for example formed with an n-polygonal structure.
  • a patch antenna with non-straight boundary edges is also possible, in particular in the form of a circular patch. In principle, there are no restrictions.
  • the patch antenna according to the invention is characterized in that due to the geometry with one or the plurality of webs for each of the slot arrangements, a manual or machine-defined step-by-step tuning is possible without problems.
  • the tuning method according to the invention is also relatively insensitive to the accuracy of the milling.
  • the solution according to the invention i. the patch antenna according to the invention also characterized in that the
  • FIG. 1 shows a schematic cross section through a patch antenna according to the invention; a plan view of a first embodiment of a patch antenna according to the invention in a schematic representation; a plan view of an opposite to Figure 2 modified embodiment; a plan view of a further modified embodiment; a further embodiment in a schematic plan view in deviation to Figure 2, wherein in each case at least two slot arrangements are provided on all sides of the radiator surface, which are offset in the longitudinal direction of the respective side boundary to each other; a further embodiment in a schematic plan view with a plurality of equidistantly arranged Abstimmstegen; a deviating from Figure 4 embodiment with a plurality of non-equidistant Abstimmstegen whose distance increases outwardly to the boundary edge of the surface radiator with a square spacing; a further modified embodiment with non-equidistant Abstimmstegen and outer closed ridge; Figure 7: a modified to Figure 6 embodiment with non-equidistant Abstimmstegen, but the outer webs are open; and
  • FIG 8 shows a modified embodiment using a circular in plan view patches.
  • FIG. 1 shows a schematic cross-sectional view of a patch antenna 1 with a ground surface 3 at the bottom, a substrate / dielectric 5 made thereon, for example made of ceramic, and a radiator surface 7 arranged on the top side 5a of the substrate 5.
  • a substrate / dielectric 5 made thereon, for example made of ceramic
  • a radiator surface 7 arranged on the top side 5a of the substrate 5.
  • the ground surface 3 on the bottom 5b of the substrate. 5
  • the antenna can be fed via one, two or more supply lines 9, which usually leads via a bore hole 3 a lying below in the ground surface 3, a bore 5 c aligned therewith in the substrate / dielectric 5 up to the radiator surface 7 lying on top it is electrically-galvanically connected to a feed point 11.
  • a feed line a linearly or circularly polarized patch radiator and using at least two feed lines which terminate at two mutually offset feed points (mutually offset by 90 ° feed points), a dual polarized or circularly polarized patch radiator can be formed in a known manner.
  • a plurality of bores corresponding to the variant shown in FIG. 1 are provided, through which a feed line 9 passes.
  • the feeding of the emitter surface of the patch radiator for example, not only by means of a coaxial cable (often called “sample feed"), but also by the following measures:
  • the feeding takes place e.g. In stripline technology (eg microstrip line, coplanar line or other forms), which are sometimes also known under the terms “microstrip line feed” or “edge feed” and in the case of an adapted feed line under the term “inset feed” or in the case of a missing Galvanic connection can also be called “Coupled Inset Feed”.
  • In stripline technology eg microstrip line, coplanar line or other forms
  • the feed takes place in the form of a "proximity coupling", in which the feed line is located in a different substrate plane than the radiating element.
  • aperture coupling in which the substrate plane of the feed line is separated from the radiator element by a metallic surface with an aperture.
  • a feed arrangement can also be realized in the form of a so-called “Stacked Coupling Feed", in which the emitter element is excited by being coupled by a feed element.
  • the peripheral edge region 5 'a is visible on the upper side 5 a of the substrate / dielectric 5. That is, the peripheral edge region 5'a projects laterally beyond the radiator surface 7.
  • the square basic (or rectangular) formed radiator surface 7 is provided, with each parallel to each other, the oppositely arranged longitudinal sides 13a and 13b transverse sides.
  • the emitter surface 7 has a peripheral edge 13, which in the exemplary embodiment shown directly comprises two opposite parallel longitudinal sides 13a and two transverse sides 13b offset by 90 ° thereto.
  • other radiating surfaces with curved edges 13 can also be used, in particular in the form of a circular radiator surface 7.
  • the central axis lies on the intersection of the diagonals through the corners of the emitter surface 7 formed quadratically in the exemplary embodiment.
  • the respective slot arrangement 15 is not incorporated as a continuous slot, but comprises in the illustrated embodiment according to Figure 2 at least one Schiitzaus Principleung 115, that is in the present case a Schiitzaus Principleung 115a, the edge 13, ie the respective longitudinal or transverse side 13a or 13b out, via a crosspiece 17 is completed.
  • an open slot recess 115 'then adjoins the crosspiece 17 towards the edge 13.
  • the mentioned transverse or tuning web 17 runs parallel to the respective associated longitudinal or transverse edge 13a, 13b, from which the respective slot arrangement 15 originates.
  • the slot arrangements 15 run perpendicular to the respective edge section 13 or 13c from which the associated slot arrangement 15 originates, the directions of extension 15 'of this slot arrangement in the exemplary embodiment shown passing through the central axis Z which is aligned perpendicular to the radiator surface 7 is.
  • the electrically conductive transverse or tuning web 17 connects the two electrically conductive adjacent sections of the radiator surface 7. These Therefore, transverse webs 17 are part of the metallization surface 117, that is, a total of the radiator surface 7.
  • the mentioned slot recesses 115 are produced from home by suitable methods, such as etching, mechanical milling, etc.
  • the mentioned transverse or Abstimmstege 17 no separate, subsequently applied to the radiator surface 7 electrically conductive parts, but are part of a uniformly formed radiating surface 7, usually in the form of a metallization layer or surface 117th
  • the slot arrangement 15 can in principle extend obliquely from the associated longitudinal or transverse side 13a, 13b, ie at an angle which deviates from a 90 ° angle to the extension direction of the longitudinal or transverse side 13a, 13b, ie from a right angle to associated edge portion 13c deviates, in the area of the slot assembly 15 begins.
  • the slot assembly 15 may extend at an angle less than or greater than 90 ° with respect to a tangent that contacts the circular rim 13 or edge portion 13c from which the slot assembly 15 extends.
  • the extensions of the slot arrangements ie, the axis in which the slot arrangement 15 is formed
  • the respective slot arrangement 15 is oriented at right angles to the respectively associated longitudinal and transverse sides 13a, 13b and thus to the associated edge 13 or associated edge section 13c, from which the respective slot arrangement 15 runs.
  • the respective slot arrangement 15 has Weil two lateral slot boundaries 19, which are also parallel to each other at a distance.
  • the conductive transverse webs 17 provided in this slot arrangement and the associated web edges 17a are also preferably aligned parallel to one another and preferably parallel to the respectively associated longitudinal and transverse edges 13a, 13b and thus respectively to the associated edge section 13c from which the relevant slot arrangement 15 goes out.
  • a slot recess 115 closed by a transverse or tuning web 17 is therefore provided for each slot arrangement 15.
  • the first or the edge 13 closest lying and closed by a transverse web 17 slot recess is formed by the slot recess 115a.
  • the open slot recess 115 'according to FIG. 2 in the region of the edge 13 can be dispensed with, so that then the closed slot recess 115a acts as the first slot recess adjoins the associated edge or edge portion 13c, in which the outer edge 17a of the transverse web 17, for example, in the immediate extension of the edge 13 or the edge portion 13c, ie in the immediate extension of the respective longitudinal or transverse edge 13a, 13b runs.
  • the respective web length 21, which also corresponds to the slot width 21 in the embodiment shown, can be chosen differently, which will be discussed later.
  • the web width 23 may vary in their dimensions.
  • the length 25 of the respective slot recess 115 which are chosen differently can.
  • the recess length 25 for the outer first open slot recess 115, 115 ' is just as long as for the subsequent inner Schiit zaus Principleung 115, 115 a, where, as mentioned, the relevant Schiitzaus traditions 115', 115 a each Slot arrangement 15 of the respective longitudinal or transverse edge 13a, 13b, starting in the slot direction 15 'are behind each other.
  • the respective slot recess 15 is provided on each of the four outer edges 13a, 13b, preferably in the middle of the respective longitudinal and transverse edges 13a, 13b.
  • FIG. 2a shows a patch antenna with a basically similar construction as explained with reference to FIG. 2, but only with two opposite slot arrangements 15 (and not with a total of four slot arrangements as in FIG. 2).
  • a first closed slot recess 115 a is located at the immediate edge 13, that is to say at the one shown here, one longitudinal slot 13 a and subsequently separated by a further slot 17.
  • a next closed slot recess 115b connects.
  • the edge recess 13 closest to the slot recess 115a is closed by an outer slot 17 whose outer slot edge 17a is aligned with the peripheral edge 13, So part of the peripheral edge 13 of the electrically conductive metallization 117 is.
  • the respective slot length 25 is different in the two successive Schiit zaus strictly strictly strictly ausjar 115 a and 115 b, wherein the outer slot 115 a is longer, in the illustrated embodiment, approximately twice as long as the inward toward the central axis Z subsequent slot recess 115 b.
  • a slot arrangement 15 is again provided on each of the four longitudinal or transverse sides, namely in each case once again only a single slot recess 115 a, whose transverse or withdrawal web 17 is again provided on the outside as in FIG the outer boundary edge 17a of the web 17 is aligned with the edge 13 of the patch surface 7.
  • two shallow recesses 15 which are offset in the longitudinal direction of the respective longitudinal and transverse edges 13a, 13b can be provided.
  • three, four or a maximum of five Schiitzaus traditions 15 may be provided on each side, each extending from the associated longitudinal and transverse edges 13a, 13b and preferably arranged parallel to each other and thereby offset in the longitudinal direction of the respective longitudinal and transverse edge to each other ( preferably at equal intervals or at different distances from each other).
  • the respective slot assembly 15 may include a plurality of individual closed slot recesses 115.
  • the Schiit zausappel 115 are each surrounded by the radiator surface 7, said transverse webs 17 represent cable bridges that connect the corresponding portions of the radiator surface 7 on both sides of the respective slot assembly 15 and at the same time the individual Schiit zausappel 115 separate from each other, so that thereby the so-called closed Schiit zausappel 115 are formed.
  • slot recesses 115a, 115b, 115c, 115d, 115e and 115f are provided.
  • the ridge width 21 and the recess length 25 is always the same in this embodiment, so that all slot recesses 115 have the same size and shape. In other words, this results in an equidistant arrangement of the electrically conductive transverse or tuning webs 17th
  • the exemplary embodiment according to FIG. 4 also differs from the one according to FIGS. 2 and 3 in that the slot recess 115a located at the outermost edge is also bordered by an outside at the level of the respective edge 13, ie the respective edge portion 13c, ie at the level of the respective longitudinal and transverse edge 13a , 13b arranged transverse or Ab- 17 is closed, so thus the edge 13 and thus the associated edge portion 13c, ie the respective longitudinal and transverse edge 13a, 13b runs continuously, as can be seen from Figure 4.
  • a Schiitzausnaturalung 115 'open to the associated edge 13 is thus not provided in this embodiment.
  • FIG. 5 shows that the individual ski recesses 115 can also have different lengths.
  • the recess length 25 changes in the slot direction 15 '.
  • no overlying, open slot recess 115 ' is provided.
  • each slot assembly 15 only a closed slot recess 115, ie 115a includes, which is closed by the outside, provided at the level of the edge 13 transverse and Abstimmsteg 17 , as shown for example in FIG. 2a.
  • FIG. 8 in which, in deviation from the preceding exemplary embodiments, a patch antenna in a central plan view, ie at least one emitter surface 7, for example in the form of a metallized surface 117 is shown, which consists of a circular shape in plan view.
  • the slot recesses 115 here 115a to 115c, are provided offset by 90 ° relative to one another about the central axis Z, which can be formed with respect to their slot length 25 or in their slot or web width 21, as this was explained with reference to the preceding embodiments.
  • the edge-side electrically conductive transverse or Abstimmsteg 17 is arranged at the level of the peripheral edge 13, so that its outer boundary edge 17a is designed partially circular with a radius around the center or the central axis Z of the circular radiator surface 7, so that a total circular edge 13 results.
  • the first closed slot recess 115a lying closest to the edge 13 lie so far inwardly in the emitter surface 7 that a slot recess 115 'open to the outside in the radial extension remains on the electrically conductive transverse or tuning web 17 which is too far away. can connect, as shown in a modification for the slot arrangement 15 on the right in FIG.
  • two or more juxtaposed radiator arrangements could be provided, ie pairwise or parallel arrangements with a plurality of juxtaposed rows of radiator recesses 115, as shown in principle with reference to Figure 3 for a rather square in plan view radiator surface 7.
  • Figure 8 thereby extend the gegebe ⁇ appropriate, several StrahlerausEnglishept of the emitter surface 13c preferably so that the extension of the slot arrangements 15 cut 115 comprehensive slot arrangements 15 7 surrounding and delimiting edge in radial direction, respectively, the central axis Z of the emitter surface 7 would.
  • the respective extension of the slot arrangement 15 can also run obliquely past the central axis Z of the radiator surface 7, in which case the slot arrangements 15 would not run in the radial direction to the central axis Z and thus not perpendicular to a tangent would terminate at the associated edge portion 13d from which the respective slot arrangement 15 originates (wherein in FIG. 8 a tangent T is shown for the slot arrangement 15 at the bottom), but at an angle deviating from 90 ° with respect to this tangent T.
  • the term generally refers to the edge 13 or the associated edge section 13c from which the respective slot arrangement 15 originates.
  • the inventively embodied patch antenna and the tuning method of the patch antenna according to the invention has great advantages especially when a corresponding patch antenna in use for RFID systems, for example, with an operating frequency between 800 MHz and 1000 MHz to be operated.
  • the method is suitable for dielectrics of the most varied composition of materials and with very different permittivity numbers, in particular for patch antennas with a substrate / dielectric which, for example, has a dielectric constant for ceramics between 20 to 80, in particular 30 to 50 or for example 35 to 40, e.g. at 38.
  • a tuning range results through the individual slot arrangements up to more than 30 MHz, in particular up to more than 20 MHz and more than 10 MHz and more than 5 MHz, but at least up to 5 MHz.
  • the width 21 of the individual slot recesses (in each case parallel to the associated edge section) can be, for example, between 0.3% to 27%, in particular between 0.7% to 15%, 1% to 2.6% and in particular by 1.0% to 2 %, for example, by 1.4% based on the wavelength in the substrate, and with respect to an operating wavelength or preferably to the average operating wavelength in the substrate.
  • the slot length ie the recess length 25 for each Schlit zausnaturalung 15 (ie the so-called slot depth) can be between 0.8% to 25%, in particular between 1.7% to 10%, 2.6% to 5% and in particular by 3.9%, and also again relative to an operating wavelength or preferably to the average operating wavelength in the substrate.
  • the width of the transverse or tuning webs (17) between 0.1% to 18%, in particular between 0.1% to 5% and in particular between 0.1% to 1.8% based on an operating wavelength and in particular the average operating wavelength in the substrate 5 may be preferred.
  • the length that is, the total length of a slot assembly 15, starting from the edge 13 with a first open Schiit zaus Principleung 115 'or without such an open Schiit zausnaturalung 115' may be different.
  • the maximum length of the entire respective slot arrangement 15 can be between 0.8% and 25%, in particular between 1.7% to 10%, 2.6% to 5% and in particular about 3.9% based on an operating wavelength and preferably on the average operating wavelength in the substrate (5) lie.
  • the individual slot arrangements 15 are preferably each centered with respect to the associated edge section of the patch surface or the associated metallization, that is to say the radiator surface 7.
  • these slot arrangements 15 can also deviate from their central position, preferably up to 5%, 10%, 15%, 20%, or preferably up to 25%, 30%, 35% or maximum up to 40%.
  • the individual slot recesses can be arranged within a range of at most 10% to 90% of the total length of the longitudinal and transverse sides 13a, 13b.
  • the slot recesses 115 and the slot recesses 115 laterally delimiting slot boundaries 19 are aligned parallel to each other and each perpendicular to the adjacent longitudinal and transverse edge. But even here, angle deviations of up to 20% are possible. Angular deviations of up to 20% are also possible with respect to the transverse or tuning webs 17, which need not necessarily run parallel to the adjacent longitudinal and transverse edges.

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Abstract

L'invention concerne une antenne patch améliorée, présentant les caractéristiques suivantes : au moins un ensemble de fentes (15) partant d'une partie de bord (13c) est disposé sur au moins la partie de bord (13c) concernée située dans la direction circonférentielle et de préférence sur au moins deux et en particulier quatre parties de bord (13c) de la surface d'émission (7) décalées dans la direction circonférentielle. L'ensemble de fentes (15) comprend dans la direction des fentes (15') s'éloignant de la partie de bord (13c) associée au moins un évidement fendu fermé (115; 115a, 115b,..., 115f) et l'évidement ou les évidements fendus fermés (115; 115a, 115b,..., 115f) sont fermés par un pont transversal ou de réglage (17) électroconducteur opposé à la partie de bord (13c) associée.
PCT/EP2012/000588 2011-02-17 2012-02-09 Antenne patch et procédé de réglage de fréquence d'une antenne patch de ce type WO2012110215A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP12705978.0A EP2676326B1 (fr) 2011-02-17 2012-02-09 Antenne patch et procédé de réglage de fréquence d'une antenne patch de ce type

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE201110011494 DE102011011494A1 (de) 2011-02-17 2011-02-17 Patchantenne sowie Verfahren zur Frequenzabstimmung einer derartigen Patchantenne
DE102011011494.7 2011-02-17

Publications (1)

Publication Number Publication Date
WO2012110215A1 true WO2012110215A1 (fr) 2012-08-23

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PCT/EP2012/000588 WO2012110215A1 (fr) 2011-02-17 2012-02-09 Antenne patch et procédé de réglage de fréquence d'une antenne patch de ce type

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EP (1) EP2676326B1 (fr)
DE (1) DE102011011494A1 (fr)
WO (1) WO2012110215A1 (fr)

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US20050264458A1 (en) * 2004-05-27 2005-12-01 Matsushita Electric Industrial Co., Ltd. Antenna device, and method of manufacturing the same antenna device
FR2912266A1 (fr) * 2007-02-07 2008-08-08 Satimo Sa Antenne imprimee avec encoches dans le plan de masse

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US20030174096A1 (en) * 2002-03-15 2003-09-18 Mendolia Greg S. Method of mechanically tuning antennas for low-cost volume production
US20050116868A1 (en) * 2003-11-27 2005-06-02 Alps Electric Co., Ltd. Antenna device capable of adjusting frequency
WO2005096439A1 (fr) * 2004-04-01 2005-10-13 Kathrein-Werke Kg Antenne du type de construction plane
US20050264458A1 (en) * 2004-05-27 2005-12-01 Matsushita Electric Industrial Co., Ltd. Antenna device, and method of manufacturing the same antenna device
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DE102011011494A1 (de) 2012-09-06
EP2676326A1 (fr) 2013-12-25
EP2676326B1 (fr) 2014-12-17

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