WO2011135224A1 - Surface adaptee a filtrer une pluralite de bandes de frequences - Google Patents
Surface adaptee a filtrer une pluralite de bandes de frequences Download PDFInfo
- Publication number
- WO2011135224A1 WO2011135224A1 PCT/FR2011/050843 FR2011050843W WO2011135224A1 WO 2011135224 A1 WO2011135224 A1 WO 2011135224A1 FR 2011050843 W FR2011050843 W FR 2011050843W WO 2011135224 A1 WO2011135224 A1 WO 2011135224A1
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- WIPO (PCT)
- Prior art keywords
- pattern
- segments
- branches
- surface according
- segment
- Prior art date
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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
- H01Q15/14—Reflecting surfaces; Equivalent structures
-
- 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
- H01Q15/0013—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices said selective devices working as frequency-selective reflecting surfaces, e.g. FSS, dichroic plates, surfaces being partly transmissive and reflective
-
- 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
Definitions
- the present invention relates to a frequency selective surface, that is to say a surface adapted to screen the passage of electromagnetic waves belonging to certain frequency bands.
- Frequency-selective surfaces are generally referred to in the art as FSS (Frequency Selective Surface). They comprise a set of identical elementary conductive patterns, reproduced in a periodic arrangement on one side of a dielectric support. The shape and the dimensions of the elementary pattern, the arrangement of the periodic arrangement, and the characteristics of the conductive material of the pattern and the dielectric material of the support, are the main factors determining the filtering properties of the surface.
- One of the applications concerned concerns the selective shielding of a building or part of a building against certain electromagnetic waves.
- the frequencies that we generally want to filter we find in particular the carrier frequencies of GSM mobile phone systems (0.9, 1.8 and 2.1 GHz), as well as the carrier frequencies wireless computer network systems of the Wi-Fi type (2.4 and 5.4 GHz).
- the dielectric support may be an epoxy-based or plastic-based substrate on which the conductive patterns are formed by conductive layer deposition, according to methods of making similar to the methods of making printed circuits. It has also been proposed to produce frequency-selective surfaces directly on paper or cardboard-type supports, for example by printing with a conductive ink. This latter embodiment has the particular advantage of significantly reducing the cost of these surfaces.
- Figure 1 is a top view schematically showing an elementary conductive pattern 1 of a frequency selective surface.
- the pattern 1, formed on one side of a dielectric support 10, is a tripole consisting of three identical segments 12a, 12b and 12c of length L s ⁇ extending in a star from a center 14.
- the segments 12a to 12c form two by two angles of approximately 120 °.
- FIG. 2 is a top view schematically showing a portion of a frequency-selective surface formed by reproducing, in a periodic arrangement on the dielectric support 10, the elementary pattern 1 of FIG. 1.
- the pattern 1 is reproduced by translation in each of the directions of the segments 12a to 12c of the tripole, so that a same distance D m , non-zero, separates each outer end of a segment of a pattern from the center of a neighboring pattern.
- the translation operation is repeated until covering the entire target area.
- the surface thus formed has a resonance frequency essentially dependent on the length parameters L s of the tripole segments, and of distance D m between adjacent patterns.
- Such a surface has the property of filtering the electromagnetic waves belonging to a frequency band centered on its resonance frequency. The effectiveness of filtering depends also the width W and the thickness (not visible in the figure) of the pattern plot, as well as the thickness (not visible in the figure) of the dielectric support 10.
- a disadvantage of the frequency-selective surface described in connection with FIGS. 1 and 2 is that its frequency response depends on the angle of incidence of the electromagnetic waves with respect to the surface, as well as the polarization of the incident electromagnetic waves.
- this surface can filter only a single frequency band centered on its resonant frequency.
- frequency-selective surfaces adapted to each of the bands concerned should be superimposed.
- an object of an embodiment of the present invention is to provide a frequency selective surface at least partially overcoming some of the disadvantages of existing solutions.
- An object of an embodiment of the present invention is to provide such a surface whose filtering properties are independent of the incident angle and the polarization of the incident electromagnetic waves.
- An object of an embodiment of the present invention is to provide such a surface adapted to filter several distinct frequency bands.
- An object of an embodiment of the present invention is to provide such a surface whose coverage rate of the conductive patterns is relatively low.
- an embodiment of the present invention provides a surface adapted to filter a plurality of frequency bands, this surface comprising a set of disjoint identical elementary conductive patterns, reproduced in a periodic arrangement on a dielectric support, the pattern elementary element comprising: a tripole consisting of three identical segments extending in a star from a center; and two branches extending symmetrically from an intermediate point of each segment, this intermediate point being located at the same distance from the center for each of the segments, the general directions of the two branches forming an angle of approximately 120 ° and defining an arrowhead directed outwards, the branches associated with two distinct segments being non-intersecting.
- the tripole segments form two by two angles of approximately 120 °.
- the elementary pattern further comprises two identical first fins extending symmetrically from the end of each segment, the first fins forming an angle of approximately 120 ° and defining a tip of arrow pointing outward from the pattern.
- the unit cell further comprises two identical second fins extending from the free end of each leg, each second fin forming an angle of approxi mately ⁇ 60 ° with the direction general branch.
- the second fins of each branch are aligned in the same direction, this direction intersecting the direction of the segment from which the branch is derived.
- the branches comprise at least one slot extension in a direction intersecting the general direction of the branch.
- the elementary pattern is reproduced by translation along each of the directions of the segments of the tripole so that the same distance separates each end of a segment of a pattern from the center of a pattern. neighbour.
- the surface is adapted to filter three frequency bands respectively centered on 0.9, 1.8 and 2.1 GHz.
- the surface is adapted to filter two frequency bands respectively centered on 2.4 and 5.4 GHz.
- the dielectric support is a support of the paper or cardboard type
- the conductive patterns are produced by printing with a conductive ink.
- Another embodiment of the present invention provides the use of the above-mentioned surface for filtering three frequency bands in the range of 0.9 to 5.4 GHz, wherein the overall dimensions of an elementary pattern are the order of 1 to 10 centimeters, the lengths of each of the segments, branches, and fins being adjusted to select the three frequency bands referred.
- Figure 1 previously described, is a top view schematically showing an elementary conductive pattern of a frequency selective surface
- Figure 2 previously described, is a top view schematically showing a portion of a frequency selective surface formed by repeating the elementary pattern of Figure 1;
- Fig. 3 is a top view schematically showing an embodiment of an elementary conductive pattern of a frequency-selective surface;
- Fig. 4 is a top view schematically showing a portion of a frequency-selective surface formed by repeating the elementary pattern of Fig. 3;
- Figures 5 to 9 are schematic top views showing various alternative embodiments of the elementary conductive pattern of Figure 3.
- Fig. 10 is a diagram showing the frequency responses of a surface formed from the elementary pattern of Fig. 5 for electromagnetic waves of different angles of incidence.
- Fig. 3 is a top view schematically showing an embodiment of an elementary conductive pattern 31 of a frequency-selective surface.
- the conductive material may be aluminum, gold, copper, silver, carbon, iron, platinum, graphite, or a conductive alloy of several of these materials .
- the higher the electrical conductivity of the material the better the filtering performed by the surface.
- the pattern 31, formed on one face of a dielectric support 10, comprises a base tripole, consisting of three approximately identical segments 12a, 12b and 12c of length L s ⁇ extending star from a center 14.
- the segments 12a to 12c form two by two angles of approximately 120 °, for example between 110 and 130 °.
- the pattern 31 further comprises, for each segment 12a, 12b, 12c, two branches, 32al and 32a2 respectively, 32bl and 32b2, and 32c1 and 32c2, substantially identical, extending from an intermediate point of the segment, substantially symmetrically with respect to the direction of the segment.
- the branches 32 have the form of bars of length 3 ⁇ 4.
- the intermediate point is located approximately at the same distance from the center 14.
- the general directions of the two branches 32 form an angle of approximately 120 °, for example between 110 and 130 °, and define an arrowhead directed outward of the pattern.
- the branches 32 associated with two distinct segments 12 are not secant.
- FIG. 4 is a top view schematically showing a portion of an embodiment of a frequency selective surface formed by reproducing, in a periodic arrangement on the dielectric support 10, the elementary pattern 31 of FIG.
- the pattern 31 is reproduced by translation along each of the directions of the segments 12a to 12c of the base tripole, so that the same distance D m , which is not zero, separates each outer end of a segment of a pattern 31, from the center 14 of a neighbor 31 pattern.
- the translation operation is repeated until covering the entire target area. It will be noted that the dimensions of the elementary pattern and the distance D m are chosen such that the elementary patterns are disjointed.
- the frequency response of the surface thus formed depends essentially on the length L s of the segments 12, the length L 1 of the branches 32, the distance 3 ⁇ 4 between the intermediate point of departure of the branches 32 of a segment 12 and the center 14 of the pattern, and the distance D m between neighboring patterns.
- the inventors have observed that such a surface has three main resonant frequencies.
- the first resonant frequency depends essentially on the length L s of the segments 12 and the distance D m between adjacent patterns.
- the second resonant frequency depends essentially on the length 3 ⁇ 4 of the branches 32 and the distance between the center 14 of the pattern and the intermediate point of the segment 12 from which the branches are derived.
- the third resonant frequency depends on all of the aforementioned parameters.
- Such a surface has the property of filtering the electromagnetic waves belonging to three distinct frequency bands centered on its three main resonant frequencies.
- simulation software is used to test different combinations of parameters by making progressive adjustments until a set of parameters is obtained which is suitable for the target frequency bands.
- the adjustment of the first and second resonance frequencies is relatively easy, but it is difficult to adjust the third resonant frequency without modifying the first two frequencies.
- the three resonance frequencies of the surface of FIG. 4 remain slightly dependent on the angle of incidence and the polarization of the electromagnetic waves.
- Fig. 5 is a top view schematically showing another embodiment of an elementary conductive pattern 51 of a frequency-selective surface.
- the pattern 51 includes all the elements of the pattern 31 of Figure 3. It also includes two substantially identical blades have length L, respectively 52al and 52a2, 52b2 and 52bl and 52cl and 52c2, extending from the outer end of each segment 12, substantially symmetrically with respect to the direction of the segment.
- the fins 52 of each segment 12 form between them an angle of approximately 120 °, for example between 110 and 130 °, and define an arrow point directed towards the outside of the pattern.
- the pattern 51 further comprises two substantially identical fins of length L 1, respectively 54a1 and 54a2, 54a21 and 54a22, 54bl1 and 54bl2, 54b21 and 54b22, 54cl1 and 54cl2, and 54c21 and 54c22, extending at from the outer end of each branch 32 (on the side of the branch opposite the segment from which it is derived), substantially symmetrically with respect to the general direction of the branch.
- the fins 54 of each branch 32 form between them an angle of approximately 120 °, for example between 110 and 130 °, and define an arrow point directed outwards.
- the dimensions of the pattern are chosen so that fins associated with distinct segments or branches are not intersecting and do not intersect the other segments and branches of the pattern.
- FIG. 5 shows, in dotted lines, part of a pattern 51 'corresponding to a translation of the pattern 51 in the direction of the segment 12a of the pattern 51.
- the fins 52 of the pattern segment 51' the closest to the center 14 of the pattern 51 are included in the space delimited by the segments 12b and 12c and by the branches 32b2 and 32c1 of the pattern 51.
- a non-zero distance D m separates the center 14 from the pattern 51, end of the segment 12 closest.
- other units (not shown) of a frequency-selective surface are similarly formed, by translation along the directions of the other segments 12, according to a periodic arrangement of the type described with reference to FIG. 4.
- the surface thus formed has three distinct main resonant frequencies. These three resonance frequencies are independent of the angle of incidence and the polarization of the electromagnetic waves.
- one introduction of additional parameters as L and k L a length of the fins 52 and 54 increases the possibilities of resonant frequency setting.
- FIG. 6 is a top view schematically showing an alternative embodiment of the elementary conductive pattern of FIG. 5.
- the pattern 61 of FIG. 5 is a top view schematically showing an alternative embodiment of the elementary conductive pattern of FIG. 5.
- two identical fins 64 (respectively 64all and 64al2, 64a21 and 64a22, 64bl1 and 64bl2, 64b21 and 64b22, 64cl1 and 64cl2, and 64c21 and 64c22) associated with a branch 32 each form an angle of approximately 60 °, for example between 55 and 65 °, with the general direction of the branch, and are aligned substantially in the same direction, this direction intersecting the direction of the segment 12 from which branch 32 originates.
- the pattern 61 makes it possible to obtain surfaces with three resonant frequencies. It notably makes it possible to obtain resonant frequencies that are different from those obtained from the pattern 51, and has the same adjustment possibilities and the same insensitivity to the orientation and polarization of the electromagnetic waves as the pattern 51.
- FIG. 7 is a top view schematically showing an alternative embodiment of the elementary conductive pattern of FIG. 6.
- the pattern 71 of FIG. 7 is a top view schematically showing an alternative embodiment of the elementary conductive pattern of FIG. 6.
- the pattern 71 differs from the pattern of Figure 6 by the shape of the branches from segments 12.
- the pattern 71 has two branches 72
- branches 72 comprise a square-shaped extension H c , extending in a direction approximately orthogonal to the general direction of the branch, towards the outside of the pattern.
- the pattern 71 makes it possible to obtain surfaces with three resonance frequencies.
- the Prediction of a slot extension on the branches 72 makes it possible to vary the length of the branches further, which increases the possibilities of adjusting the resonant frequencies.
- the resonant frequencies of the surfaces obtained from the pattern 71 are insensitive to the orientation and the polarization of the electromagnetic waves.
- the inventors obtained a surface adapted to screen at frequencies of the order of 0.9 and 1.8 GHz. , using the following parameters: The inventors have also obtained a surface adapted to screen at frequencies of the order of 2.4 and 5.4 GHz using the following parameters: In the context of the two examples above, there is no interest in the third resonant frequency that nevertheless exists.
- FIG. 8 is a top view schematically representing an alternative embodiment of the elementary conductive pattern of FIG. 7.
- each branch coming from a segment of the base tripole comprises three crenellated extensions. of height H c , extending in directions approximately orthogonal to the general direction of the branch, outwardly of the pattern.
- the inventors obtained a surface adapted to screen at frequencies of the order of 0.9, 1.8 GHz, and 2.1 GHz using the following parameters:
- FIG. 9 is a top view schematically showing an alternative embodiment of the elementary conductive pattern of FIG. 8.
- each branch issuing from a segment of the base tripole comprises crenellated extensions. of different heights, extending in directions approximately orthogonal to the general direction of the branch, alternately outwardly and inwardly of the pattern.
- the blades associated with the branches are arranged in an arrow, as in the pattern 51 of FIG.
- FIG. 10 is a diagram representing the evolution, as a function of frequency, of the transmission factor (in decibels) of a surface formed by reproduction of the elementary pattern 51 of FIG. 5, for electromagnetic waves of angles of distinct impact.
- the curves 101, 102 and 103 represent the frequency responses of the surface for electromagnetic waves oriented in directions forming respectively angles of 0, 30 and 60 ° with the normal to the plane of the surface.
- the choice of parameters is such that the surface has three distinct resonance frequencies, of the order of 0.9, 1.8 and 2.1 GHz, respectively. It can be seen from the diagram of FIG. 10 that the resonance frequencies of the surface, corresponding to negative peaks in the curves 101, 102, 103, are independent of the angle of incidence of the waves. Note also that the resonance frequencies are also independent of the polarization of the waves.
- the frequency-selective surfaces described above are carried out on paper or cardboard type supports, for example on wallpapers, on paper or cardboard coated with plasterboard coated with cardboard, or on any other support adapted to coat the walls of a room of a building.
- the conductive patterns are for example made by printing with conductive inks.
- the coverage ratio of the conductive patterns is relatively low, for example less than 15%. This makes it possible to maintain a manufacturing cost of these relatively low surfaces.
- the elementary conductive patterns described in relation to FIGS. 7 to 9 may give rise to several variants.
- one skilled in the art will implement the desired operation by varying the number, direction, and direction of crenellated extensions formed on the branches of the pattern.
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Aerials With Secondary Devices (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
Description
Claims
Priority Applications (11)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP11731009.4A EP2564468B1 (fr) | 2010-04-27 | 2011-04-13 | Surface adaptee a filtrer une pluralite de bandes de frequences |
ES11731009.4T ES2543695T3 (es) | 2010-04-27 | 2011-04-13 | Superficie adaptada para filtrar una multitud de bandas de frecuencias |
BR112012027525A BR112012027525A2 (pt) | 2010-04-27 | 2011-04-13 | superfície adaptada para filtrar uma pluralidade de faixas de frequências |
KR1020127030131A KR101747903B1 (ko) | 2010-04-27 | 2011-04-13 | 다수의 주파수 대역들을 필터링하기 위한 표면 |
CA2797559A CA2797559C (fr) | 2010-04-27 | 2011-04-13 | Surface adaptee a filtrer une pluralite de bandes de frequences |
RU2012150505/08A RU2012150505A (ru) | 2010-04-27 | 2011-04-13 | Поверхность для фильтрации множества полос частот |
JP2013506709A JP5697826B2 (ja) | 2010-04-27 | 2011-04-13 | 複数の周波数帯域をフィルタにかけるための表面 |
US13/643,787 US9065180B2 (en) | 2010-04-27 | 2011-04-13 | Surface for filtering a plurality of frequency bands |
DK11731009.4T DK2564468T3 (en) | 2010-04-27 | 2011-04-13 | Surface for filtering the multiple frequency bands |
CN201180021625.0A CN103004023B (zh) | 2010-04-27 | 2011-04-13 | 用于过滤多个频段的表面 |
SG2012079398A SG185049A1 (en) | 2010-04-27 | 2011-04-13 | Surface for filtering a plurality of frequency bands |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1053217 | 2010-04-27 | ||
FR1053217A FR2959355B1 (fr) | 2010-04-27 | 2010-04-27 | Surface adaptee a filtrer une pluralite de bandes de frequences |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2011135224A1 true WO2011135224A1 (fr) | 2011-11-03 |
Family
ID=43414830
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR2011/050843 WO2011135224A1 (fr) | 2010-04-27 | 2011-04-13 | Surface adaptee a filtrer une pluralite de bandes de frequences |
Country Status (13)
Country | Link |
---|---|
US (1) | US9065180B2 (fr) |
EP (1) | EP2564468B1 (fr) |
JP (1) | JP5697826B2 (fr) |
KR (1) | KR101747903B1 (fr) |
CN (1) | CN103004023B (fr) |
BR (1) | BR112012027525A2 (fr) |
CA (1) | CA2797559C (fr) |
DK (1) | DK2564468T3 (fr) |
ES (1) | ES2543695T3 (fr) |
FR (1) | FR2959355B1 (fr) |
RU (1) | RU2012150505A (fr) |
SG (1) | SG185049A1 (fr) |
WO (1) | WO2011135224A1 (fr) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103401049A (zh) * | 2013-08-07 | 2013-11-20 | 中国科学院长春光学精密机械与物理研究所 | 一种极化性能稳定的厚屏频率选择表面滤波器 |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP6142522B2 (ja) * | 2012-12-20 | 2017-06-07 | 横浜ゴム株式会社 | 周波数選択部材および曲面への周波数選択素子の配列決定方法 |
US9622338B2 (en) | 2013-01-25 | 2017-04-11 | Laird Technologies, Inc. | Frequency selective structures for EMI mitigation |
US9307631B2 (en) * | 2013-01-25 | 2016-04-05 | Laird Technologies, Inc. | Cavity resonance reduction and/or shielding structures including frequency selective surfaces |
CN109755740B (zh) * | 2017-11-01 | 2021-06-22 | 航天特种材料及工艺技术研究所 | 一种带阻型fss结构、fss屏及罩壁结构 |
CN108899635A (zh) * | 2018-06-25 | 2018-11-27 | 四川斐讯信息技术有限公司 | 一种频选结构及其设计方法、包含其的内置天线通讯设备 |
CA3106112A1 (fr) * | 2018-07-11 | 2020-01-16 | Cld Western Property Holdings Ltd. | Filtre radio plan selectif en frequence |
FR3101151B1 (fr) * | 2019-09-24 | 2021-12-17 | Office National Detudes Rech Aerospatiales | Dispositif pour reveler des variations spatiales de polarisation d’un rayonnement electromagnetique |
CN110943301B (zh) * | 2019-12-12 | 2021-02-12 | 中国科学院长春光学精密机械与物理研究所 | 跨尺度双带通频率选择表面及其周期单元、设计方法 |
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US3148370A (en) * | 1962-05-08 | 1964-09-08 | Ite Circuit Breaker Ltd | Frequency selective mesh with controllable mesh tuning |
US4126866A (en) * | 1977-05-17 | 1978-11-21 | Ohio State University Research Foundation | Space filter surface |
US20040252054A1 (en) * | 2003-06-11 | 2004-12-16 | Brown Stephen B. | Beam steering with a slot array |
GB2460288A (en) * | 2006-06-19 | 2009-11-25 | Mitsubishi Cable Ind Ltd | Electromagnetic wave shielding material and electromagnetic wave absorber |
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US5161068A (en) * | 1989-07-20 | 1992-11-03 | The United States Of America As Represented By The Secretary Of The Air Force | Superconducting searching filter |
DE4121245C2 (de) * | 1991-06-27 | 1995-08-10 | Daimler Benz Aerospace Ag | Frequenzselektive Oberflächenstruktur |
US6911957B2 (en) | 2003-07-16 | 2005-06-28 | Harris Corporation | Dynamically variable frequency selective surface |
JP2005142298A (ja) | 2003-11-05 | 2005-06-02 | Yokohama Rubber Co Ltd:The | 周波数選択板の素子パターン及び周波数選択板 |
US7884718B2 (en) | 2006-12-20 | 2011-02-08 | Symbol Technologies, Inc. | Frequency selective surface aids to the operation of RFID products |
US7990328B2 (en) * | 2007-03-29 | 2011-08-02 | The Board Of Regents, The University Of Texas System | Conductor having two frequency-selective surfaces |
-
2010
- 2010-04-27 FR FR1053217A patent/FR2959355B1/fr not_active Expired - Fee Related
-
2011
- 2011-04-13 US US13/643,787 patent/US9065180B2/en active Active
- 2011-04-13 KR KR1020127030131A patent/KR101747903B1/ko active IP Right Grant
- 2011-04-13 BR BR112012027525A patent/BR112012027525A2/pt not_active IP Right Cessation
- 2011-04-13 CN CN201180021625.0A patent/CN103004023B/zh active Active
- 2011-04-13 SG SG2012079398A patent/SG185049A1/en unknown
- 2011-04-13 DK DK11731009.4T patent/DK2564468T3/en active
- 2011-04-13 EP EP11731009.4A patent/EP2564468B1/fr active Active
- 2011-04-13 RU RU2012150505/08A patent/RU2012150505A/ru unknown
- 2011-04-13 JP JP2013506709A patent/JP5697826B2/ja not_active Expired - Fee Related
- 2011-04-13 CA CA2797559A patent/CA2797559C/fr active Active
- 2011-04-13 ES ES11731009.4T patent/ES2543695T3/es active Active
- 2011-04-13 WO PCT/FR2011/050843 patent/WO2011135224A1/fr active Application Filing
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US3148370A (en) * | 1962-05-08 | 1964-09-08 | Ite Circuit Breaker Ltd | Frequency selective mesh with controllable mesh tuning |
US4126866A (en) * | 1977-05-17 | 1978-11-21 | Ohio State University Research Foundation | Space filter surface |
US20040252054A1 (en) * | 2003-06-11 | 2004-12-16 | Brown Stephen B. | Beam steering with a slot array |
GB2460288A (en) * | 2006-06-19 | 2009-11-25 | Mitsubishi Cable Ind Ltd | Electromagnetic wave shielding material and electromagnetic wave absorber |
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Title |
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ROGER A HILL ET AL: "The Effect of Perturbating a Frequency-Selective Surface and Its Relation to the Design of a Dual-Band Surface", IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION, IEEE SERVICE CENTER, PISCATAWAY, NJ, US, vol. 44, no. 3, 1 March 1996 (1996-03-01), XP011002680, ISSN: 0018-926X * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103401049A (zh) * | 2013-08-07 | 2013-11-20 | 中国科学院长春光学精密机械与物理研究所 | 一种极化性能稳定的厚屏频率选择表面滤波器 |
Also Published As
Publication number | Publication date |
---|---|
JP2013527694A (ja) | 2013-06-27 |
DK2564468T3 (en) | 2015-07-20 |
CN103004023A (zh) | 2013-03-27 |
ES2543695T3 (es) | 2015-08-21 |
FR2959355A1 (fr) | 2011-10-28 |
CA2797559A1 (fr) | 2011-11-03 |
BR112012027525A2 (pt) | 2016-07-26 |
FR2959355B1 (fr) | 2012-08-17 |
EP2564468B1 (fr) | 2015-05-27 |
CA2797559C (fr) | 2017-09-05 |
KR20130105288A (ko) | 2013-09-25 |
US20130127651A1 (en) | 2013-05-23 |
EP2564468A1 (fr) | 2013-03-06 |
CN103004023B (zh) | 2014-12-24 |
KR101747903B1 (ko) | 2017-06-15 |
US9065180B2 (en) | 2015-06-23 |
RU2012150505A (ru) | 2014-06-10 |
JP5697826B2 (ja) | 2015-04-08 |
SG185049A1 (en) | 2012-12-28 |
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