EP1661206A1 - High impedance substrate - Google Patents
High impedance substrateInfo
- Publication number
- EP1661206A1 EP1661206A1 EP04786396A EP04786396A EP1661206A1 EP 1661206 A1 EP1661206 A1 EP 1661206A1 EP 04786396 A EP04786396 A EP 04786396A EP 04786396 A EP04786396 A EP 04786396A EP 1661206 A1 EP1661206 A1 EP 1661206A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- layer
- sheet
- high impedance
- substrate according
- magnetic
- 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.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
- H01Q7/06—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop with core of ferromagnetic material
-
- 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
- H01Q15/0066—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 being reconfigurable, tunable or controllable, e.g. using switches
Definitions
- the invention lies in the field of high impedance substrates. Such substrates are in particular applicable in microwave devices.
- the invention finds an application in particular but not only in telecommunications, for example in the frequency band going from approximately 50 MHz to approximately 4 GHz for the production of antennas.
- an artificial magnetic conductor 900 constituting a high impedance surface including: A frequency selective surface having a frequency dependent permeability in a direction normal to the frequency selective surface A conductive ground plane 806 parallel to the frequency selective surface and A dielectric medium between the ground plane and the frequency selective surface in which conductive metal parts in the form of partitions perpendicular to the ground plane connect the frequency-selective surface to the ground plane.
- the surface is frequency selective because / it comprises a network 102 of resonant loops also called artificial magnetic molecules 804.
- resonant loops or artificial magnetic molecules 804 are strongly coupled together in a capacitive manner, thus forming a frequency-selective capacitive surface.
- Various embodiments including in particular multi-band surfaces constituted by layers each having loops resonant at different frequencies, and uses of such a surface are described in 'particular for the realization of antennas. It is known that such high impedance substrates are very useful in the field of antennas. Such surfaces are intended to interact with an incident electromagnetic wave arriving on this high impedance surface. They make it possible to reduce the size of the devices used while improving the selectivity and directivity characteristics of the antennas produced.
- the invention relates to a high impedance surface having a small thickness compared to the wavelength in the vacuum of a wave at a central frequency of a frequency band for which the surface has a high impedance. It also targets a high impedance surface having a high bandwidth. It targets a high impedance surface using materials which is not limited by the properties of the material to the working frequencies of the surface. It targets a high impedance tunable surface, that is to say which can be varied on command the central frequency and bandwidth.
- the invention relates to a high impedance substrate comprising a first layer or sheet of insulating material, having a lower face and an upper face, the substrate comprising conductive patterns mechanically linked to the substrate, characterized in that, certain conductive patterns mechanically linked to the substrate are associated with a magnetic pad, and in that at least one electrical interconnection brings into electrical contact two points distinct from each other of a conductive pattern mechanically linked to the substrate, this conductive pattern having an associated magnetic pad, passing above the magnetic pad associated with said conductive pattern mechanically linked to the substrate.
- block indicates the set of points in a metric space each of whose coordinates is taken in a bounded interval and whose rectangular parallelepiped is the simplest image. It is therefore a piece of matter.
- conductive patterns consist of conductive tracks deposited on one and / or the other of the upper or lower faces of the first layer or sheet of insulating material.
- the high impedance substrate comprises, in addition to a first layer or sheet of insulating material, a second layer or sheet having an upper face opposite the lower face of the first sheet or layer and a lower face, the conductive patterns being deposited at least in part of them, on one and / or the other of the upper or lower faces of this second layer or sheet.
- the conductive patterns form electrical circuits possibly together with active or passive components.
- the high impedance substrate comprises a second layer or sheet
- these active or passive components are mounted on the surface on one and / or the other of the upper or lower faces of said second layer or sheet.
- the electronic components are elements having a resistance value and a capacity value.
- the high impedance substrate further comprises a ground plane, consisting of a third layer or sheet having an upper face and a lower face at least one of these faces being constituted by a conductive material. This ground plane can be located above the upper face of the first layer or sheet and in this case the magnetic blocks will be mechanically linked to the upper face of this ground plane.
- the ground plane can also be located under the first sheet or layer, or if the embodiment comprises a second sheet or layer between the first sheet or layer and the second sheet or layer, or even under the second sheet or layer. In these latter cases the magnetic blocks will be mechanically linked to the upper face of the first sheet or layer.
- FIG. 1 represents a perspective view of a first embodiment of the invention
- FIG. 2 represents an exemplary embodiment of a conductive pattern making it possible to constitute together with the connections passing above the magnetic pad
- a solenoid
- FIG. 3 comprises parts A and B. these are curves representing respectively , as a function of the working frequency expressed in gigahertz, for a high impedance substrate according to the invention, the real values of the magnetic permeability ⁇ ', in part A and the values of the magnetic losses ⁇ "in part B for different values of Figure 4 has parts A and B.
- FIG. 1 represents a perspective view of a first embodiment of the invention.
- a plate of insulating material for example made of Kapton
- a block 5 of magnetic material is associated with each of the conductive patterns 3.
- each block 5 has the shape of a parallelepiped, for example a rectangle.
- Each electrically conductive pattern 3 together with active and / or passive components generally represented by a rectangle 7 in Figure 1 an electrical circuit.
- this circuit is completed by an electrical interconnection, for example in the form of a wire or a ribbon 13, connecting a first 9 and a second 11 point distinct from the first, of the pattern 3.
- a part of the 5 pattern 3, and the connecting wire or ribbon 13, thus together form a turn surrounding the magnetic pad 5.
- An example of pattern 3, allowing a configuration with several turns forming together a solenoid surrounding the magnetic pad 5 has been shown in perspective in FIG. 2.
- the pattern 5 comprises several conductive tracks 10, parallel to each other, and for example perpendicular to the direction 15 of greatest length of the parallelepipedal pad 5.
- the tracks 10 each have two ends 9 and 11.
- the conductive patterns 3 were produced by etching techniques for the conductive layer of copper, in themselves known in the field of printed circuits. These patterns in the form of tracks have a width of approximately 1 mm.
- a capacitance and a resistance have been reported at the locations marked 7 in FIG. 1. In an exemplary embodiment the capacitance was 21 picofarads and the resistance of 0.1 ohms. It is also possible to add to a capacity or a resistance of fixed value, or to replace such a capacity or such a resistance by one or more active components having a value of variable capacity and / or resistance, for example controlled electronic.
- the component capacity value is a function of an electrical quantity, a voltage or a current, applied to said active component.
- the varactor ZC830B from the manufacturer Zétex which allows to vary in a simple way the capacity of the RC circuit 7.
- a magnetic layer consisting for example of an elastomer loaded with 50% powder of iron is placed above the conductive patterns 5, for example bonded using an insulating adhesive. This material has a magnetic permeability ⁇ 'of 11 there
- a rubber or a plastic filled with a magnetic powder Preferably, the volume fraction of magnetic powder exceeds 30%. It is also possible to use stacks of magnetic and insulating layers, comprising at least 5% by volume of magnetic material.
- the conductive direction of the stacks will preferably be parallel to the axis of the solenoid formed by the connections 13 and their complement of the pattern 3.
- the layer of magnetic material is etched in two directions of the plane of the layer, for example, perpendicular to each other, over a depth of 5 mm, for example, so as to obtain the magnetic blocks 5.
- the solenoid is in this example in series with the circuit RC, formed by the resistance and the capacity symbolically represented by the square 7 in FIG. 1. The advantage of introducing a magnetic material forming a core into the solenoid thus formed is to significantly increase the levels of magnetic permeability compared to "coreless" case.
- the Applicant has carried out magnetic permeability and magnetic loss measurements obtained with magnetic blocks 5 made of elastomeric material loaded with 50% iron powder produced as indicated above for three values 0.1, 2, and 10 ohms of the resistance R of the RC circuit.
- the capacity C remained during these measurements at a value of 50 picofarads.
- the solenoid surrounding each block 5 had 5 turns.
- the magnetic permeability characteristics obtained as a function of the working frequency are represented by curves represented in FIG. 3, part A and B.
- the magnetic permeability values ⁇ ′ are represented in part A in FIG. 3.
- Part B represents the values of the magnetic losses ⁇ "as a function of the frequency expressed in gigahertz.
- the peak values of ⁇ " decrease when the value of the resistance increases. The highest peak has a level of 5 and the narrowest is obtained for the resistance value 0.1.
- the curve corresponding to this resistance value is referenced a.
- the two other curves, referenced c and b respectively have peaks
- the width of the magnetic loss peak goes from 10 MHz for the resistance value 0.1 ohms to 35 MHz for the resistance value 10 ohms.
- the levels of ⁇ 'and ⁇ are the essential values which condition the impedance seen by an electromagnetic wave arriving on the high impedance substrate thus obtained.
- the source of said wave is located on the side of face 6 of plate 1 on which there are the magnetic blocks 5. High levels of magnetic permeability favor obtaining high impedances over a wide frequency range.
- the respective values of ⁇ 'and ⁇ condition the level of loss associated with the frequency, these losses being desired or not depending on the applications that are given to the high impedance substrate.
- the height of the magnetic loss peak can be adjusted or modified very easily by a simple variation of a resistance value.
- the levels represented in FIG. 3 correspond to a rate 10% coverage as explained above. The transition to a coverage rate of 50% would increase the value of ⁇ "by a factor of 5.
- the coverage rates of the face 6, by the magnetic blocks 5 will be B 14406. 3 GB 12
- the seven curves represented in part A of FIG. 4 each represent the value of the magnetic permeability ⁇ 'for the different values 30 of the capacity C.
- the value of the losses ⁇ "as a function of the frequency in gigahertz plotted on the abscissa is represented in part B of FIG. 4.
- the frequency corresponding to the loss peak decreases when the value of the capacitance C increases.
- a loss peak is present for a value of approximately 0.13 gigahertz on the curve corresponding to a capacity value of 38 picofarads
- the loss peak is present for a value corresponding to approximately 0.37 gigahertz.
- the loss peaks of the other 5 curves range at intermediate values between these two frequency values These peaks are located at increasing frequency values when the value of the capacitance C decreases by the value 32 pF at the value 2 pF
- These curves illustrate that according to the invention, by adding or choosing a few simple electronic components, it is possible to achieve a high impedance surface whose frequency response ence presents a peak in magnetic losses which reaches values of several units, and this from a very small quantity of magnetic blocks each provided with their associated solenoid.
- the frequency of the loss peak can be easily adjusted by adjusting the value of a capacitor.
- the conductive pattern 3 is arranged on a second sheet or layer 2.
- This second sheet or layer 2 has two faces, an upper face 12 opposite 10 of the lower face 8 of the first sheet or layer 1 and a lower face 14.
- the upper face 12 of the sheet or layer 2 receives a part 3 2 of the conductive pattern 3.
- the part 3 2 of the conductive pattern 3 comprises all the active or passive components 7 forming a circuit with the conductive pattern 3.
- a part 3 ⁇ of the conductive pattern 3 remains present on the upper face 6 of the first sheet or layer 1, as shown in FIG. 5.
- the electrical connections between the conductive pattern part 3 ⁇ and the conductive pattern part 3 2 are provided by metallized holes 25 joining the upper and lower faces of the layer or sheet 1.
- the connections between the connections 13 passing through above a magnetic pad 5 and the conductive pattern part 3 2 located on the sheet or layer 2 are provided by such metallized holes 18, when the conductive pattern part 3 2 includes a complement to said B 1b
- the underside of the sheet or layer 2 is metallized so that this sheet or layer 2 forms a ground plane.
- the substrate according to the invention comprises a ground plane lying under the first layer or sheet 1 opposite the underside of said first layer or sheet.
- a conductive plane 4 forming a ground plane is interposed between the sheets or layers 1 and 2.
- the conducting plane may be in the form, for example, of a third layer or sheet 4. In FIG. 5, so as not to impede the view of layer 2, this plane has only been shown partially.
- This third sheet or layer 4 then has metallized holes 18 each forming a connection passage.
- the opening of these holes is in itself known, electrically insulated to avoid grounding of the connections.
- FIG. 6 A variant of the embodiment shown in FIG. 5, also making it possible to reduce electromagnetic leaks upwards, is represented in FIG. 6.
- the upper face of the sheet or layer 1 is entirely metallized, with the exception of the locations surrounding metallized holes 18 electrically joining points of the sheet or layer 1 and points of the sheet or layer 2.
- the metal blocks 5 are then bonded to the top of the metal deposit by means of an electrically insulating adhesive. With the exception of the metallized holes 18 and their outlets, the entire conductive pattern 3 is transferred to the second sheet or layer 2.
Landscapes
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
- Coils Or Transformers For Communication (AREA)
- Combinations Of Printed Boards (AREA)
- Aerials With Secondary Devices (AREA)
- Finishing Walls (AREA)
- Crystals, And After-Treatments Of Crystals (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0350492A FR2859309B1 (en) | 2003-09-02 | 2003-09-02 | HIGH IMPEDANCE SUBSTRATE |
PCT/FR2004/050398 WO2005024999A1 (en) | 2003-09-02 | 2004-08-30 | High impedance substrate |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1661206A1 true EP1661206A1 (en) | 2006-05-31 |
EP1661206B1 EP1661206B1 (en) | 2006-12-13 |
Family
ID=34130848
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04786396A Expired - Lifetime EP1661206B1 (en) | 2003-09-02 | 2004-08-30 | High impedance substrate |
Country Status (9)
Country | Link |
---|---|
US (1) | US7071876B2 (en) |
EP (1) | EP1661206B1 (en) |
JP (1) | JP4901473B2 (en) |
AT (1) | ATE348419T1 (en) |
CA (1) | CA2508073A1 (en) |
DE (1) | DE602004003717T2 (en) |
FR (1) | FR2859309B1 (en) |
NO (1) | NO20053835D0 (en) |
WO (1) | WO2005024999A1 (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8840918B2 (en) | 2001-05-01 | 2014-09-23 | A. V. Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences | Hydrogel compositions for tooth whitening |
JP2005039608A (en) * | 2003-07-16 | 2005-02-10 | Citizen Watch Co Ltd | Antenna and receiving device |
JP4372118B2 (en) * | 2006-05-18 | 2009-11-25 | 株式会社東芝 | High frequency magnetic material |
JP5271714B2 (en) * | 2006-11-22 | 2013-08-21 | Necトーキン株式会社 | EBG structure, antenna device, RFID tag, noise filter, noise absorbing sheet, and wiring board with noise absorbing function |
US8884834B1 (en) | 2012-09-21 | 2014-11-11 | First Rf Corporation | Antenna system with an antenna and a high-impedance backing |
Family Cites Families (23)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58137206A (en) * | 1982-02-09 | 1983-08-15 | Sony Corp | Inductance element |
JPH062904B2 (en) * | 1984-12-04 | 1994-01-12 | 新日本製鐵株式会社 | High strength low alloy steel Extra thick steel manufacturing method |
JPH02296306A (en) * | 1989-05-10 | 1990-12-06 | Mitsubishi Electric Corp | Inductor |
KR910004079A (en) * | 1989-07-21 | 1991-02-28 | 빈센트 조렙 로너 | Improved hybrid microelectronic circuit and manufacturing method thereof |
JP2980629B2 (en) * | 1990-01-10 | 1999-11-22 | ティーディーケイ株式会社 | Structure of hybrid integrated circuit components |
JPH05218726A (en) * | 1991-11-13 | 1993-08-27 | Seiko Epson Corp | Ferrite antenna |
JPH06224618A (en) * | 1993-01-28 | 1994-08-12 | Hitachi Ltd | Self-impedance variable active antenna |
JPH07326516A (en) * | 1994-05-31 | 1995-12-12 | Kyocera Corp | Laminated coil board |
JPH08273936A (en) * | 1995-04-03 | 1996-10-18 | Murata Mfg Co Ltd | Coil component and board with built-in coil |
JP3472430B2 (en) * | 1997-03-21 | 2003-12-02 | シャープ株式会社 | Antenna integrated high frequency circuit |
JP3491670B2 (en) * | 1998-04-08 | 2004-01-26 | 三菱マテリアル株式会社 | Anti-theft tag and method of manufacturing the same |
JP3527105B2 (en) * | 1998-09-28 | 2004-05-17 | 富士通アクセス株式会社 | Printed board |
JP2000183634A (en) * | 1998-12-15 | 2000-06-30 | Murata Mfg Co Ltd | Antenna system and radio unit mounting the same |
JP2000196282A (en) * | 1998-12-24 | 2000-07-14 | Tokin Corp | Electronic circuit device and portable telephone mounting the same and simplified portable telephone |
JP2001274020A (en) * | 2000-03-23 | 2001-10-05 | Sanyo Electric Co Ltd | Coil unit, coil, transformer, and boosting circuit |
US6384797B1 (en) * | 2000-08-01 | 2002-05-07 | Hrl Laboratories, Llc | Reconfigurable antenna for multiple band, beam-switching operation |
AU762267B2 (en) * | 2000-10-04 | 2003-06-19 | E-Tenna Corporation | Multi-resonant, high-impedance surfaces containing loaded-loop frequency selective surfaces |
GB2373102A (en) * | 2001-03-06 | 2002-09-11 | Marconi Caswell Ltd | Structures with magnetic properties |
JP2002290186A (en) * | 2001-03-26 | 2002-10-04 | Tama Electric Co Ltd | Low-pass filter |
US6853350B2 (en) * | 2001-08-23 | 2005-02-08 | Broadcom Corporation | Antenna with a magnetic interface |
JP2003078197A (en) * | 2001-08-30 | 2003-03-14 | Kyocera Corp | Wiring board |
US7420524B2 (en) * | 2003-04-11 | 2008-09-02 | The Penn State Research Foundation | Pixelized frequency selective surfaces for reconfigurable artificial magnetically conducting ground planes |
US7411565B2 (en) * | 2003-06-20 | 2008-08-12 | Titan Systems Corporation/Aerospace Electronic Division | Artificial magnetic conductor surfaces loaded with ferrite-based artificial magnetic materials |
-
2003
- 2003-09-02 FR FR0350492A patent/FR2859309B1/en not_active Expired - Fee Related
-
2004
- 2004-08-30 DE DE602004003717T patent/DE602004003717T2/en not_active Expired - Lifetime
- 2004-08-30 CA CA002508073A patent/CA2508073A1/en not_active Abandoned
- 2004-08-30 AT AT04786396T patent/ATE348419T1/en not_active IP Right Cessation
- 2004-08-30 JP JP2006524404A patent/JP4901473B2/en not_active Expired - Fee Related
- 2004-08-30 WO PCT/FR2004/050398 patent/WO2005024999A1/en active IP Right Grant
- 2004-08-30 EP EP04786396A patent/EP1661206B1/en not_active Expired - Lifetime
- 2004-08-30 US US10/538,476 patent/US7071876B2/en not_active Expired - Lifetime
-
2005
- 2005-08-15 NO NO20053835A patent/NO20053835D0/en not_active Application Discontinuation
Non-Patent Citations (1)
Title |
---|
See references of WO2005024999A1 * |
Also Published As
Publication number | Publication date |
---|---|
US20060044209A1 (en) | 2006-03-02 |
ATE348419T1 (en) | 2007-01-15 |
JP4901473B2 (en) | 2012-03-21 |
JP2007504643A (en) | 2007-03-01 |
DE602004003717T2 (en) | 2007-10-18 |
EP1661206B1 (en) | 2006-12-13 |
CA2508073A1 (en) | 2005-03-17 |
DE602004003717D1 (en) | 2007-01-25 |
FR2859309B1 (en) | 2005-12-16 |
WO2005024999A1 (en) | 2005-03-17 |
NO20053835D0 (en) | 2005-08-15 |
US7071876B2 (en) | 2006-07-04 |
FR2859309A1 (en) | 2005-03-04 |
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