WO1992016031A1 - Structure dichroïque a selection de frequences possedant une bande passante variable et applications - Google Patents
Structure dichroïque a selection de frequences possedant une bande passante variable et applications Download PDFInfo
- Publication number
- WO1992016031A1 WO1992016031A1 PCT/EP1992/000386 EP9200386W WO9216031A1 WO 1992016031 A1 WO1992016031 A1 WO 1992016031A1 EP 9200386 W EP9200386 W EP 9200386W WO 9216031 A1 WO9216031 A1 WO 9216031A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- dielectric
- dichroic structure
- dielectric material
- substrate
- structure according
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/20—Filters
- G02B5/204—Filters in which spectral selection is performed by means of a conductive grid or array, e.g. frequency selective surfaces
-
- 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
- H01Q15/002—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 said selective devices being reconfigurable or tunable, e.g. using switches or diodes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q3/00—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system
- H01Q3/44—Arrangements for changing or varying the orientation or the shape of the directional pattern of the waves radiated from an antenna or antenna system varying the electric or magnetic characteristics of reflecting, refracting, or diffracting devices associated with the radiating element
Definitions
- the present invention relates to a dichroic structure for the selective attenuation according to frequency of incident electromagnetic waves the frequencies of which fall outside a predetermined passband.
- the invention concerns a dichroic structure including at least one substrate of dielectric material, at least one face of which bears an orderly and geometrically periodic array of elements of an electrically conductive material or a layer of conductive material having an orderly and geometrically periodic array of holes.
- such a dichroic structure considerably increases the communication capacity of a system having an antenna with reflectors, enabling it to operate at several frequencies.
- This drastically ⁇ reduces the weight, bulk and cost of an antenna system, which advantages are of great importance for application to satellite communications systems.
- frequency-discriminating dichroic structures may be used for forming radomes with well-defined transmission bands.
- the object of the present invention is to provide a dichroic structure with a variable working (transmission or reflection) band.
- control means are associated with the substrate of dielectric material for varying the dielectric or magnetic constant of the material so as
- the dielectric material used has a dielectric or magnetic constant which is variable as a result of the application of a potential difference across the material and the control means are arranged to apply a quasi-static, variable potential difference across the dielectric substrate.
- the dielectric material used has a dielectric or magnetic constant which can be varied significantly in dependence on its temperature and the control means comprise heating means for changing the temperature of the dielectric material.
- the heating means may comprise means for generating a high-frequency magnetic field to heat the dielectric material by induction or may be resistive heating means for changing the temperature of the dielectric material by the Joule effect.
- the dielectric material used has a dielectric or magnetic constant which can be varied as a result of the application of mechanical stress to the material, and the control means are arranged accordingly to apply such mechanical stress to the dielectric substrate material.
- Figure 1 is a perspective view of a quadrangular portion of a dichroic structure according to a first embodiment of the invention
- Figure 2 is a perspective view of a quadrangular portion of another dichroic structure according to the invention.
- Figure 3 is a perspective view of a quadrangular portion of a dielectric material used in a dichroic structure according to the invention, the portion having induction heating means, and
- Figure 4 is a graph showing schematically the attentuation characteristic of a dichroic structure according to the invention as a function of the frequency shown on the abscissa.
- a portion of a dichroic structure comprises a substrate 2 of dielectric material with two layers 3 of electrically conductive material, typically metal, on its faces.
- the layers 3 may be formed in any known manner and each has a respective orderly and geometrically periodic array of holes 4 which, in the embodiment shown by way of example, are cross-shaped.
- An example of such a material is barium titanate.
- the terminals of a variable voltage supply are connected to the two conductive layers of the dichroic structure.
- Variations of the voltage supplied by the supply 5 thus vary the dielectric constant or the magnetic constant of the material constituting the substrate 2, correspondingly shifting the passband of the dichroic structure 1 as shown, for example, in Figure 4.
- This drawing shows, by way of example, the curve of the attenuation A of the electromagnetic waves incident normally on the dichroic structure, as a function of the frequency f.
- the dichroic structure shown in the drawing will have an attenuation characteristic, for example, of the type indicated A, in Figure 4 with a central working frequency f, and a bandwidth B. around that frequency.
- the dichroic structure When the potential difference or voltage supplied by the supply 5 assumes a second value different from the first, the dichroic structure will have an attenuation characteristic with a shifted frequency, such as the characteristic indicated A 2 in Figure 4, which has a passband B 2 centered on a working frequency f 2 .
- Figure 1 described above relates to an embodiment of the invention in which the passband of the dichroic structure is shifted by the application of a quasi-static voltage, that is, a voltage whose variation with time takes place at a frequency much lower than the working frequency of the dichroic structure.
- a quasi-static voltage that is, a voltage whose variation with time takes place at a frequency much lower than the working frequency of the dichroic structure.
- the dichroic structure of Figure 2 includes a substrate 2 of dielectric material whose dielectric or magnetic constant can be varied sensitively as a result of changes in the temperature of the material.
- a conductive layer 3 applied to at least one face of the dielectric substrate 2 has an orderly and geometrically periodic array of holes 4.
- at least one face of the dielectric substrate 2 could have a converse conductive structure, that is, an orderly and geometrically periodic array of elements of an electrically conductive material whose shapes are complementary to those of the holes 4 in the layer 3 shown in Figure 2.
- a resistive element 6 which, in the embodiment illustrated, has a serpentine shape is applied to the face of the substrate 2 opposite that carrying the conductive material 3.
- the terminals of the resistive element 6 are connected to a variable supply 5. Variations in the current flowing in the resistive element 6 vary the heat dissipated by the Joule effect, correspondingly varying the temperature of the material constituting the substrate 2. The variation thus induced in the dielectric constant and/or the magnetic constant of the material causes a shift in the passband of the dichroic structure 1.
- devices or systems other than that shown by way of example may be used to heat the substrate 2 of dielectric material by the Joule, effect.
- Figure 3 shows a portion of a substrate 2 of dielectric material whose dielectric and/or magnetic constant can vary appreciably as a result of a change in the .temperature of the material.
- a conductive element 7 is wrapped around the substrate 2 as a helix, its terminals conveniently being connected to a high-frequency generator (not shown) .
- the helix constituted by the element 7 heats the dielectric sheet 2 by induction.
- the frequency passband of the structure can be shifted at will or when necessary.
- a material whose dielectric constant can be varied as a result of the application of mechanical stress may be used as a single or layered dielectric substrate.
- the passband of the dichroic structure can also easily be shifted by the application of.mechanical stress thereto.
- the dichroic structures with variable passbands according to the invention may conveniently be used in the antennae of telecommunications satellites or for the construction of "stealth" radomes, that is, those which cannot be detected by microwave radar.
Landscapes
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Laminated Bodies (AREA)
- Measurement Of Resistance Or Impedance (AREA)
- Transmission And Conversion Of Sensor Element Output (AREA)
- Physical Vapour Deposition (AREA)
- Hall/Mr Elements (AREA)
Abstract
La structure comporte au moins un substrat (2) de matériau diélectrique, dont au moins une face porte un réseau ordonné et géométriquement périodique d'éléments en matériau électriquement conducteur ou, inversement, porte au moins une couche (3) de matériau conducteur possédant un réseau de trous (4) ordonné et géométriquement périodique. La structure est caractérisée en ce que des moyens de commande (5, 6, 7) sont associés au substrat (2) de matériau diélectrique permettant de faire varier la constante diélectrique ou magnétique du matériau de façon à en modifier la bande passante.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITTO910139A IT1245423B (it) | 1991-02-27 | 1991-02-27 | Struttura dicroica discriminante in frequenza con banda passante variabile, e sue applicazioni |
ITTO91A000139 | 1991-02-27 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1992016031A1 true WO1992016031A1 (fr) | 1992-09-17 |
Family
ID=11408995
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1992/000386 WO1992016031A1 (fr) | 1991-02-27 | 1992-02-24 | Structure dichroïque a selection de frequences possedant une bande passante variable et applications |
Country Status (2)
Country | Link |
---|---|
IT (1) | IT1245423B (fr) |
WO (1) | WO1992016031A1 (fr) |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5386215A (en) * | 1992-11-20 | 1995-01-31 | Massachusetts Institute Of Technology | Highly efficient planar antenna on a periodic dielectric structure |
WO1996000454A1 (fr) * | 1994-06-27 | 1996-01-04 | The Secretary Of State For Defence | Panneau absorbant |
US5526449A (en) * | 1993-01-08 | 1996-06-11 | Massachusetts Institute Of Technology | Optoelectronic integrated circuits and method of fabricating and reducing losses using same |
FR2761818A1 (fr) * | 1997-04-03 | 1998-10-09 | Daimler Benz Aerospace Ag | Procede de fabrication de reflecteurs selectifs en polarisation |
EP0875957A2 (fr) * | 1997-05-01 | 1998-11-04 | Kitagawa Industries Co., Ltd. | Absorbeur d'ondes électromagnétiques |
WO1999031759A1 (fr) * | 1997-12-17 | 1999-06-24 | Baesystems Electronics Ltd. | Deflecteur de faisceau de rayonnement magnetique |
US5990850A (en) * | 1995-03-17 | 1999-11-23 | Massachusetts Institute Of Technology | Metallodielectric photonic crystal |
EP1049192A2 (fr) * | 1999-04-26 | 2000-11-02 | Hitachi, Ltd. | Dispositif de communication à haute fréquence |
FR2858469A1 (fr) * | 2003-07-30 | 2005-02-04 | Univ Rennes | Antenne a cavite resonante, reconfigurable |
EP1936740A1 (fr) * | 2006-12-22 | 2008-06-25 | Giesecke & Devrient GmbH | Antenne de mesure d'une information de mouvement d'après le principe Doppler, transpondeur, système et procédé |
WO2011134666A1 (fr) * | 2010-04-30 | 2011-11-03 | Thales | Element rayonnant compact a cavites resonantes |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108983457B (zh) * | 2018-08-10 | 2021-12-03 | 南方科技大学 | 一种颜色可调谐的液晶彩色滤光片 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3309704A (en) * | 1965-09-07 | 1967-03-14 | North American Aviation Inc | Tunable absorber |
US3631501A (en) * | 1970-02-16 | 1971-12-28 | Gen Dynamics Corp | Microwave phase shifter with liquid dielectric having metallic particles in suspension |
WO1990014696A1 (fr) * | 1989-05-19 | 1990-11-29 | Stefan Johansson | Appareil d'antenne muni d'un reflecteur ou d'une lentille comprenant un reseau balaye en frequence |
US4987418A (en) * | 1987-12-28 | 1991-01-22 | United Technologies Corporation | Ferroelectric panel |
-
1991
- 1991-02-27 IT ITTO910139A patent/IT1245423B/it active IP Right Grant
-
1992
- 1992-02-24 WO PCT/EP1992/000386 patent/WO1992016031A1/fr active Application Filing
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3309704A (en) * | 1965-09-07 | 1967-03-14 | North American Aviation Inc | Tunable absorber |
US3631501A (en) * | 1970-02-16 | 1971-12-28 | Gen Dynamics Corp | Microwave phase shifter with liquid dielectric having metallic particles in suspension |
US4987418A (en) * | 1987-12-28 | 1991-01-22 | United Technologies Corporation | Ferroelectric panel |
WO1990014696A1 (fr) * | 1989-05-19 | 1990-11-29 | Stefan Johansson | Appareil d'antenne muni d'un reflecteur ou d'une lentille comprenant un reseau balaye en frequence |
Cited By (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5386215A (en) * | 1992-11-20 | 1995-01-31 | Massachusetts Institute Of Technology | Highly efficient planar antenna on a periodic dielectric structure |
US5526449A (en) * | 1993-01-08 | 1996-06-11 | Massachusetts Institute Of Technology | Optoelectronic integrated circuits and method of fabricating and reducing losses using same |
WO1996000454A1 (fr) * | 1994-06-27 | 1996-01-04 | The Secretary Of State For Defence | Panneau absorbant |
US5990850A (en) * | 1995-03-17 | 1999-11-23 | Massachusetts Institute Of Technology | Metallodielectric photonic crystal |
FR2761818A1 (fr) * | 1997-04-03 | 1998-10-09 | Daimler Benz Aerospace Ag | Procede de fabrication de reflecteurs selectifs en polarisation |
US6057796A (en) * | 1997-05-01 | 2000-05-02 | Kitagawa Industries Co., Ltd. | Electromagnetic wave absorber |
EP0875957A3 (fr) * | 1997-05-01 | 1999-04-28 | Kitagawa Industries Co., Ltd. | Absorbeur d'ondes électromagnétiques |
EP0875957A2 (fr) * | 1997-05-01 | 1998-11-04 | Kitagawa Industries Co., Ltd. | Absorbeur d'ondes électromagnétiques |
WO1999031759A1 (fr) * | 1997-12-17 | 1999-06-24 | Baesystems Electronics Ltd. | Deflecteur de faisceau de rayonnement magnetique |
US6429803B1 (en) | 1997-12-17 | 2002-08-06 | Bae Systems Electronics Limited | Magnetic beam deflection devices |
EP1049192A2 (fr) * | 1999-04-26 | 2000-11-02 | Hitachi, Ltd. | Dispositif de communication à haute fréquence |
EP1049192A3 (fr) * | 1999-04-26 | 2002-02-06 | Hitachi, Ltd. | Dispositif de communication à haute fréquence |
US6862001B2 (en) | 1999-04-26 | 2005-03-01 | Hitachi, Ltd. | High frequency communication device |
FR2858469A1 (fr) * | 2003-07-30 | 2005-02-04 | Univ Rennes | Antenne a cavite resonante, reconfigurable |
EP1936740A1 (fr) * | 2006-12-22 | 2008-06-25 | Giesecke & Devrient GmbH | Antenne de mesure d'une information de mouvement d'après le principe Doppler, transpondeur, système et procédé |
WO2011134666A1 (fr) * | 2010-04-30 | 2011-11-03 | Thales | Element rayonnant compact a cavites resonantes |
FR2959611A1 (fr) * | 2010-04-30 | 2011-11-04 | Thales Sa | Element rayonnant compact a cavites resonantes. |
US9843099B2 (en) | 2010-04-30 | 2017-12-12 | Thales | Compact radiating element having resonant cavities |
Also Published As
Publication number | Publication date |
---|---|
ITTO910139A1 (it) | 1992-08-27 |
IT1245423B (it) | 1994-09-20 |
ITTO910139A0 (it) | 1991-02-27 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US5528249A (en) | Anti-ice radome | |
WO1992016031A1 (fr) | Structure dichroïque a selection de frequences possedant une bande passante variable et applications | |
US6531936B1 (en) | Voltage tunable varactors and tunable devices including such varactors | |
CA2082580C (fr) | Antenne a microruban, particulierement pour les communications telephoniques par satellite | |
US6822622B2 (en) | Electronically reconfigurable microwave lens and shutter using cascaded frequency selective surfaces and polyimide macro-electro-mechanical systems | |
US7719477B1 (en) | Free-space phase shifter having one or more columns of phase shift devices | |
US5600325A (en) | Ferro-electric frequency selective surface radome | |
US5739796A (en) | Ultra-wideband photonic band gap crystal having selectable and controllable bad gaps and methods for achieving photonic band gaps | |
US8106850B1 (en) | Adaptive spectral surface | |
AU695429B2 (en) | Miniaturised antenna for converting an alternating voltage into a microwave and vice versa, notably for horological applications | |
EP0468623B1 (fr) | Assemblage stratifié de surfaces sélectives en fréquence et procédé adapté de modulation des caractéristiques de puissance et fréquence | |
US5162809A (en) | Polarization independent frequency selective surface for diplexing two closely spaced frequency bands | |
US20060256014A1 (en) | Frequency agile, directive beam patch antennas | |
WO1994013028B1 (fr) | Dispositifs syntonisables a micro-ondes comprenant des couches supraconductrices et ferroelectriques a haute temperature | |
US6016122A (en) | Phased array antenna using piezoelectric actuators in variable capacitors to control phase shifters and method of manufacture thereof | |
US4799034A (en) | Varactor tunable coupled transmission line band reject filter | |
WO2003023893A1 (fr) | Ligne de retard a large bande avec temps de propagation de groupe constant | |
WO1993012556A1 (fr) | Antenne ferroelectrique reseau a commande de phase a balayage | |
US6160524A (en) | Apparatus and method for reducing the temperature sensitivity of ferroelectric microwave devices | |
US3491314A (en) | Phase shifter having means to simultaneously switch first and second reactive means between a state of capacitive and inductive reactance | |
US10411349B2 (en) | Systems and methods for reducing intermodulation for electronically controlled adaptive antenna arrays | |
Lee et al. | Single-filter structure with tunable operating frequency in noncontiguous bands | |
US6421023B1 (en) | Phase shifter and associated method for impedance matching | |
WO2004027919A2 (fr) | Ligne de transmission a impedance variable commandee par couche d'activation | |
Trampler et al. | Phase-agile dual-resonance single linearly polarized antenna element for reconfigurable reflectarray applications |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): JP US |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): AT BE CH DE DK ES FR GB GR IT LU MC NL SE |
|
DFPE | Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101) | ||
122 | Ep: pct application non-entry in european phase |