EP2673831A1 - Filtre radiofrequences reglable en technologie planaire et procede de reglage du filtre - Google Patents
Filtre radiofrequences reglable en technologie planaire et procede de reglage du filtreInfo
- Publication number
- EP2673831A1 EP2673831A1 EP12703121.9A EP12703121A EP2673831A1 EP 2673831 A1 EP2673831 A1 EP 2673831A1 EP 12703121 A EP12703121 A EP 12703121A EP 2673831 A1 EP2673831 A1 EP 2673831A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- resonator
- resonators
- filter
- sections
- substrate
- 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
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/201—Filters for transverse electromagnetic waves
- H01P1/203—Strip line filters
- H01P1/20327—Electromagnetic interstage coupling
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/201—Filters for transverse electromagnetic waves
- H01P1/203—Strip line filters
- H01P1/20327—Electromagnetic interstage coupling
- H01P1/20336—Comb or interdigital filters
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/201—Filters for transverse electromagnetic waves
- H01P1/203—Strip line filters
- H01P1/20327—Electromagnetic interstage coupling
- H01P1/20354—Non-comb or non-interdigital filters
- H01P1/20363—Linear resonators
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P1/00—Auxiliary devices
- H01P1/20—Frequency-selective devices, e.g. filters
- H01P1/201—Filters for transverse electromagnetic waves
- H01P1/203—Strip line filters
- H01P1/20327—Electromagnetic interstage coupling
- H01P1/20354—Non-comb or non-interdigital filters
- H01P1/20381—Special shape resonators
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P5/00—Coupling devices of the waveguide type
- H01P5/02—Coupling devices of the waveguide type with invariable factor of coupling
Definitions
- the invention relates to radio frequency filters in planar technology adjustable or adjustable to obtain the desired filtering performance.
- Radio frequency (RF) filters operating in particular in high frequency and microwave bands include coupled resonators made from transmission lines in planar technology.
- Figures 1, 2 and 3 respectively represent three band pass filters of the state of the art.
- FIG. 1 shows a filter in planar technology reduced to its simplest expression.
- This filter comprises a half-wave resonator R2 coupled in parallel over half of its length with two adjacent resonators R1 and R3 quarter wave.
- the resonators R1, R2, R3 are most often made in microstrip line technology.
- the filter of FIG. 1 thus comprises a substrate 8, of thickness h, having a dielectric permittivity Er, having a main face 10 comprising a respective microstrip line for each resonator and a metallized face 12 opposite to the main face to form a ground plane.
- the tuning of the center frequency of the resonator R2 of FIG. 1 is mainly obtained by changing the length of the microstrip line that constitutes it.
- the resonators R1 and R3 are respectively connected to the access A1, A2 of the filter by a respective line L1 and L2 of standard input and output filter impedance characteristic, usually 50 ⁇ .
- Figures 2 and 3 show two other types of filters reduced to their simplest expression in planar technology also comprising three resonators R1, R2, R3.
- the filter of FIG. 2 is of interdigital type. One of the ends e2 of the resonator R2 is connected to ground (zero impedance)
- the filter of FIG. 3 is of comb type and also comprises three quarter-wave resonators R1, R2, R3. One of the ends e1, e2, e3 of the three resonators R1, R2, R3 is connected to ground.
- the filter of FIG. 3 makes it possible to obtain very narrow bandwidths, the filters of FIGS. 1 and 2, wider (or moderate) bandwidths. These filters are often electrically symmetrical, in this case the accesses A1 and A2 are interchangeable.
- filters including vias. This is often the case, for example, filters consisting of resonators with an end short-circuited to ground.
- compact filters made with substrates with high permittivity and / or high permeability, particularly sensitive to production tolerances and electrical parameters such as dielectric permittivity and magnetic permeability,
- the filters are made and characterized individually, apart from the systems for which they are intended. This even though they are performed in a technology identical to that of the system, for example on organic substrates or in the case of complex integrated hybrid systems in or around a stack of substrates.
- Another way of guaranteeing filter performance is to perform a characterization! and a drastic selection of substrates and other materials possibly used in an assembly (eg pre-preg), in a range of values reduced compared to those proposed by manufacturers.
- Another method is to pre-characterize the substrates in thickness and dielectric permittivity, then to perform a design adapted to each different batch. This is expensive and time consuming to put in place because of the masks for thin layers and screen printing screens for thick layers to be redone for each batch. In addition, the substrate is only part of the dispersion problem and this operation is not always sufficient.
- Another method is to introduce regulators physically on the filter.
- These adjustment elements are generally conductive pads pre-connected, the adjustment effeffue then, either by shortening, that is to say by the cutting of the link with the stud or by lengthening the structure by laying d a connection with the stud.
- This type of adjustment does not allow fine adjustments because the variations are large and do not allow a large number of possibilities, especially for compact and / or high frequency applications because the dimensions of the adjustment elements are limited in minimum dimension, for example. the manufacturing technologies.
- These elements may be metal ribbons placed on the lines. This technique has a random part related to the difficulty in controlling the shape of a ribbon that has one or more free ends.
- these elements consist of elements of appropriate dielectric constant, added to the filter to adjust its response.
- These are for example dielectric blocks (metallized or non-metallized) typically placed in two ways depending on the desired objective: Pavers placed at the open ends of lines / resonators / stubs to act on the central frequency, or between lines coupled to act on the bandwidth or rejected bandwidth or ZT transmission zeros obtained by coupling between non-adjacent resonators.
- This category of adjustment elements allows fine variations of the filter response. However, the installation of these elements is expensive and the adjustment amplitudes are low,
- varactor diodes or MEMS varactors (acronym for "Micro Machined Electro Mecanical System” in the English language) with the disadvantage of low power handling.
- CMOS Complementary Metal Oxide Semiconductor
- the invention proposes a tunable radio frequency filter in planar technology comprising a dielectric substrate and n resonators R1, R2, ... Ri, ... Rj, .. Rk, .. Rn integrated into the substrate,
- each resonator comprises, on a main plane PL of the substrate, a succession of sections t1, t2, .. tq, .. tp of planar transmission lines each having two ends, p being the number of segments of lines of planar transmission of the resonator Ri considered, p being equal to or greater than 2, q being the rank of the section, one end of a section tq of a resonator Ri being in opposite relation and separated by a distance d d one end of the next section t (q + 1) of the same resonator Ri, the ends facing successive sections of a resonator Ri being connected by an electrical connection locally raising the characteristic impedance of the resonator Ri considered.
- the electrical connection between two successive transmission line sections tq, t (q + 1) of the resonators R1, R2,... Ri,... Rj,... Rk,... Rn is a line H1 planar impedance transmission characteristic higher than the characteristic impedance of the resonator Ri considered.
- the length of the line H1 of planar transmission is greater than the distance d between the ends vis-à-vis two successive transmission line sections tq, t (q + 1) so as to increase the electrical length of the resonators R1, R2, ... Ri, ... Rj, .. Rk, .. Rn.
- the electrical connection between sections of successive transmission lines comprises at least one wiring wire in a plane P perpendicular to the main plane PL of the substrate.
- the electrical connection between two successive transmission line sections tq, t (q + 1) of the resonators R1, R2, .. Ri,... Rj,... Rk, .. Rn comprises several wires wiring in parallel, each wire being in a respective plane perpendicular to the main plane PL.
- the ends connected by a wiring wire of two successive line sections tq, t (q + 1) of a resonator Rj are close to the ends of two other sections of successive transmission lines connected by another a wire of another resonator Rk so that the surfaces formed by the wiring son of said two resonators Rj and Rk with the main plane PL are facing each other in order to obtain a coupling between the two resonators Rj and Rk.
- the substrate comprises a plurality of layers, the main plane PL comprising the transmission line sections of the resonators being between at least two superimposed layers.
- the invention also relates to a method of adjusting the adjustable filter according to the invention in planar technology comprising a dielectric substrate and n resonators R1, R2, .. Ri, ... Rj, ... Rk, .. Rn integrated into the substrate each resonator comprising, on a main plane PL of the substrate, a succession of sections t1, t2, .. tq, ..
- tp of planar transmission lines each having two ends, p being the number of planar transmission line sections of the resonator Ri considered, p being equal to or greater than 2, q being the rank of the section, one end of a section tq of a resonator Ri being in vis-à-vis and separated by a distance d from one end of the next section t (q + 1) of the same resonator Ri, the ends facing successive sections of a resonator Rq being connected by a line planar transmission device Hl (30, 34) for locally raising the characteristic impedance of the resonator Ri considered,
- the adjustable filter is a bandpass filter comprising at least one resonator Rj and a resonator Rk, the resonator Rj having the ends opposite two consecutive transmission line sections tq , t (q + 1) connected by a wiring wire near the ends of two other consecutive transmission line sections of the other resonator Rk connected by another wiring wire, so that the surfaces formed by said wires of cabling with the main plane PL of the two said resonators Rj and Rk are facing each other, the adjustment method of changing the distance and position between the one and the other wire of the resonators wiring Rj and Rk respectively to obtain, by modifying the coupling between the resonator Rj and the resonator Rk, the desired bandwidth.
- the main filters covered by this invention consist of parallel lines coupled with half-wave resonators coupled in parallel or with quarter-wave comb (low bandwidth) and / or inter-digit (wide bandwidth) resonators. .
- This technique of making and adjusting planar filters according to the invention also applies: filters with transmission zeros or ZTs, especially when these transmission zeros are obtained by coupling between non-adjacent resonators.
- the technologies for producing filter resonators may be those of micro-ribbons or planar lines, conventionally produced on a single substrate or integrated in a stack of substrates or made on a suspended substrate.
- FIG. 4a shows an adjustable filter according to the invention of the same structure as the filter of FIG. 1;
- FIG. 4b shows a partial front view of the resonator R3 of the filter of FIG. 4a;
- FIG. 4c shows a partial front view of the resonator R2 of the filter of FIG. 4a;
- - Figure 5 shows an adjustable filter according to the invention of the same structure as the filter of Figure 2;
- FIG. 6 shows an adjustable filter according to the invention of the same structure as the filter of Figure 3;
- FIG. 7 shows an exemplary embodiment of a bandpass filter according to the invention having settings on the transmission zeros
- FIG. 8a shows an alternative embodiment of an adjustable filter according to the invention of the same structure as the filter of FIG.
- FIG. 8b shows a partial cross-sectional view at the central portion of the resonator R2 of the filter of Figure 8a;
- FIG. 8c shows a view from above at the central portion of the resonator R2 of the filter of FIG. 8a;
- FIG. 9a shows another alternative embodiment of the adjustable filter of FIG. 8a
- FIG. 9b shows a partial cross-sectional view at the central portion of the resonator R2 of the filter of FIG. 9a and;
- Figure 9c shows a top view at the central portion of the resonator of the filter of Figure 9a.
- FIG. 4a shows an adjustable filter according to the invention of the same structure as the filter of FIG.
- the filter of FIG. 4a comprises a half-wave resonator R2 coupled in parallel over half of its length with two adjacent quarter-wave resonators, a resonator R1 connected by the line L1 to the access A1 of the filter and a resonator R3 connected by the line L2 to the access A2 of the filter.
- the three resonators R1, R2, R3 are in the form of microstrip lines on a dielectric substrate of thickness h.
- the resonator R1 and the resonator R3 each comprise two sections t1, t2 of microstrip transmission lines of the same characteristic impedance Zc and wavelengths W, two sections of the same resonator being connected by a respective line Hl 30 microstrip (Hl for high impedance), wi width less than the drop W line sections t1, t2.
- the impedance of the line H1 is of much higher value than the impedance Z1 of the line sections t1, t2.
- FIG. 4b shows a partial front view of the resonator R3 of the filter of FIG. 4a.
- the two line sections t1, t2 and the micro-rib line H1 of the resonators R1 and R3 are aligned along respective axes EE ', SS' parallel to the axis Ox of a reference trihedron Oxyz.
- the edges b1, b2 facing the line sections are separated by a distance d.
- the half-wave resonator R2, between the resonator R1 and the resonator R3, comprises four line sections t1, t2, t3 and t4 aligned along an axis CC parallel to the axes EE ', SS'.
- the successive sections t1, t2 on one side of the resonator R2 and the successive sections t3 and t4 on the other side of the same resonator R2 are connected by a micro-ribbon line H1 of width wi.
- the successive sections t2, t3, in the central part of the resonator R2 are themselves connected by another line Hi 34 wi width much less than the width of the line of the resonator R2.
- the other Hi line 34 between the sections t2 and t3 of the resonator R2 is of greater length than the distance d separating the edges in view of the sections t2 and t3 of said resonator R2.
- the other Hi line 34 is in the form of an S having a central portion 40 perpendicular to the axis CC of the resonator R2.
- FIG. 4c shows a partial front view of the resonator R2 of the filter of FIG. 4a.
- the lines H1 and the other line H1 34 physically create at their location between the portions of the transmission lines a narrowing of the resonators and therefore an impedance break in the resonator.
- the center frequency f 0 of the bandpass filter of FIG. 1 is mainly related to the electrical length of the resonator R2.
- the method for adjusting the filter of FIG. 1 comprises at least one wiring step, between the ends facing the line sections of the three resonators R1, R2, R3 of an adjustment element ER, which is in this embodiment, a wiring wire 50, 52 in planes perpendicular to the main plane PL of the substrate.
- first wiring son 50 provide the electrical connection between line sections without coupling between resonators.
- Second wiring son 52 ensure their provision in the resonators in addition to the electrical connection between line sections, a certain coupling between resonators.
- the lengths of the wiring wires 50, 52 and their point of connection on the ends of the line sections are adjusted to obtain the desired center frequency f0.
- Figure 4d shows a detail view in cross section of the resonator R2 showing the first wiring wire 50 welded between the ends of the two sections t2, t3 in the central portion of the resonator R2.
- the line sections t1, t2 are made in such a way that the lines H1 of the resonators R1 and R2 are in facing relation.
- the sections t3, t4 of the resonator R2 and the sections t1, t2 of the resonator R3 are made so that the lines H1 30 are also in vis-à-vis.
- Second wiring wires 52 welded in parallel with the lines H1 will allow modification of the coupling between resonators by adjusting their relative position or their proximity. The modification of this coupling will allow the adjustment, in the case of the filter of FIG. 1, of its bandwidth relatively independently of the adjustment of its central frequency f0 by the adjustment of the lengths of the first 50 and second 52 wires. wiring.
- a plurality of adjustment elements ER in the form of wiring wires and / or micro-wired conductor strips may be placed in parallel with the high impedance lines H1. , 34.
- These elements of fixed or variable length whose length will be varied and possibly, if possible, the position to adjust a coupling.
- the tapes allow to obtain better quality coefficients and to withstand higher powers.
- the automatic laying of ribbons is less widespread than the automatic laying of cabling wires.
- the length of the high-impedance lines Hl 30, 34 depends on the desired correction amplitude on the filter parameters. To obtain a sufficient adjustment amplitude by elongation or shortening of the adjustment element ER 50, 52 (wiring wires) it is necessary to arrange or fold this line H1 to obtain junction points of the adjustment element ER with the sections lines as close as possible.
- the narrowing of the resonators R1, R2, R3 of the bandpass filter of FIG. 4a by the incorporation of the high-impedance lines Hl 30, 34 between the sections t1, t2, t3, t4 of transmission lines and the elements of FIG. ER 50 setting, 52 modifies the response of the original filter as shown in Figure 1 and it is necessary to optimize the entire structure of the filter to ensure an optimal frequency response in nominal setting position.
- FIG. 5 shows an adjustable filter according to the invention of the same structure as the filter of Figure 2;
- FIG. 6 shows an adjustable filter according to the invention with the same structure as the filter of FIG.
- the filters of FIG. 5 and 6 comprise, according to the invention, sections of microstrip lines, two sections t1, t2 with resonator R1, R2, R3 connected by a line H1 and another line H1 34, first wires of wiring 50 in parallel with the other lines Hl 34 and second wiring son 52 in parallel with the lines Hl 30.
- the second wiring son 52 provide some coupling between resonators.
- the planar filters according to the invention can be made in such a way as to obtain adjustment elements ER 50 that are not coupled together, that is to say strongly away and / or oriented with a small surface area opposite, and / or adjustment elements ER 52 coupled.
- the uncoupled adjustment elements ER 50 are used to act predominantly on the center frequency f 0 of the filter. This is for example the case of the first connection wires 50 of Figures 4a, 5, 6, 8a and 9a. The goal here is to find an implementation of the setting that has little influence on the bandwidth.
- the ER adjusting elements 52 coupled together that is to say close and oriented with their facing surfaces, are used to act on the bandwidth, as is the case with the second wiring wires 52 of FIGS. 4a, 5, 6, 7, 8a and 9a.
- the setting of the ZT transmission zeros of the planar filter is similar in its implementation to the settings of the center frequency fO and the bandwidth Bp, by the characteristic and the position of the adjustment elements ER and lines H1 in the resonators.
- the coupled adjustment elements ER 54 are located on the zones of the resonators which substantially modify the transmission zeros ZT.
- FIG. 7 shows an exemplary embodiment of a bandpass filter according to the invention having settings on the ZT transmission zeros.
- the filter of FIG. 7 comprises two quarter-wave type resonators R1 and R3 and three half-wave type resonators R4, R2, R5. These resonators are considered adjacent and directly coupled together in the order R1 / R4 / R2 / R5 / R3.
- the resonators R4 and R5 are considered non-adjacent and voluntarily coupled at their center to generate ZT transmission zeros. This particular coupling is called transverse coupling.
- the filter has an axis of symmetry TT '.
- the resonator R1 and the resonator R3 each comprise two sections t1, t2 of lines, the resonator R2 three sections t1, t2, t3 of transmission lines, the non-adjacent resonators R4, R5 four line sections each t1, t2, t3 , t4.
- H1 lines connecting the sections of resonators R1, R4, R2 are preferably aligned on the same axis PP 'parallel to the axis of symmetry TT' of the filter, second wiring son 52 are welded in parallel of these lines Hl To obtain a coupling between these resonators.
- the wiring configuration is symmetrical on the other side of the axis TT 'on an alignment axis QQ' of the lines H1 of the resonators R3, R5, R2.
- the configuration of the filter of FIG. 7 is such that the centers of the resonators R4 and R5 comprise lines H1 and third wiring wires 54 forming parallel surfaces with the main plane PL in a plane parallel to the plane Oxy of the reference trihedron. oxyz. It is these couplings at the centers of the resonators R4 and R5 which imply the transmission zeros ZT of the filter of FIG. 7 and the possibility of setting the so-called transmission zeros.
- the substrate is a multilayer substrate comprising the sections t1, t2, .. tq, .. tp of integrated transmission lines between at least two layers and therefore not accessible at the surface by the outside the filter.
- the substrate comprises metallized holes at the ends of the sections of transmission lines connecting metallized pads on the surface of the substrate. The electrical connection by wiring son 50, 52, 54 and / or lines Hl 30, 34 can then be performed on these metallized beaches.
- FIG. 8a shows an alternative embodiment of an adjustable filter according to the invention of the same structure as the filter of FIG. 1.
- Figure 8b shows a partial cross-sectional view at the central portion of the resonator R2 of the filter of Figure 8a.
- Figure 8c shows a top view at the central portion of the resonator R2 of the filter of Figure 8a.
- the filter of FIG. 8a comprises a multilayer substrate 90 having two superposed layers C1, C2 and, buried between these two layers C1, C2, sections of lines t1, t2, t3, t4 and other lines Hl 34 connecting these sections. to form the resonators R1, R2 and R3.
- the multilayer substrate comprises an upper face 13 and a lower metallized opposite face 14.
- the upper face 13 comprises metallized pads 82 connected by metallized holes 80 in the layer C1 at the ends of sections of transmission lines buried in the substrate 90.
- the adjustment elements ER that is to say wiring wires 50, 52 are fixed on these metallized pads 82 on the upper face 13 of the substrate 90.
- the other lines Hl 34 are on the same face of the substrate (main plane PL) as the buried lines of lines.
- the upper face 13 may also have a hollow ground plane around the metallized areas 82.
- FIG. 9a shows another variant of the adjustable filter of FIG. 8a on multilayer substrate.
- Figure 9b shows a partial cross-sectional view at the central portion of the resonator R2 of the filter of Figure 9a.
- Figure 9c shows a top view at the central portion of the resonator of the filter of Figure 9a.
- the other lines H1 34 are made with the metallized areas 82 on the upper face 13 of the multilayer substrate 90, the metallized areas and the other lines H1 34 are connected to the ends of the sections of transmission lines. buried by the metallized holes 80 in the layer C1
- This upper part can in particular be used to make and adjust transverse couplings between non-adjacent resonators and thus introduce and control additional ZT transmission zeros.
- the technique proposed in this invention allows fine adjustments to filter structures consisting of planar transmission lines.
- the ground planes are not shown in Figures 1 to 9a which illustrate the filter examples.
- This technique is based on conventional means of manufacturing microelectronics: Laying wiring son and / or conductive tapes unrolled length and controlled positions. The response of the filter is adjusted by varying the dimensions and attachment points of the wiring and / or conductive strips.
- the impedance breaks in the resonators provide additional degrees of freedom that can affect the frequency response with more possibilities. This can lead to a lower number of resonators compared to a conventional non-adjustable structure.
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Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1100408A FR2971629A1 (fr) | 2011-02-10 | 2011-02-10 | Filtre radiofrequences reglable en technologie coplanaire et procede de reglage du filtre |
PCT/EP2012/052271 WO2012107543A1 (fr) | 2011-02-10 | 2012-02-10 | Filtre radiofrequences reglable en technologie planaire et procede de reglage du filtre |
Publications (2)
Publication Number | Publication Date |
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EP2673831A1 true EP2673831A1 (fr) | 2013-12-18 |
EP2673831B1 EP2673831B1 (fr) | 2017-03-22 |
Family
ID=45569673
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP12703121.9A Active EP2673831B1 (fr) | 2011-02-10 | 2012-02-10 | Filtre radiofrequences reglable en technologie planaire et procede de reglage du filtre |
Country Status (5)
Country | Link |
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US (1) | US9362604B2 (fr) |
EP (1) | EP2673831B1 (fr) |
ES (1) | ES2627835T3 (fr) |
FR (1) | FR2971629A1 (fr) |
WO (1) | WO2012107543A1 (fr) |
Families Citing this family (4)
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US9536758B1 (en) | 2016-05-26 | 2017-01-03 | Anand Deo | Time-varying frequency powered semiconductor substrate heat source |
US11152232B2 (en) | 2016-05-26 | 2021-10-19 | Anand Deo | Frequency and phase controlled transducers and sensing |
EP3818586A4 (fr) | 2018-07-03 | 2021-09-15 | Deo, Anand | Commande de fréquence de résonateurs à ligne de transmission planaires de transducteurs localisés |
EP4417015A1 (fr) | 2021-10-13 | 2024-08-21 | Deo, Anand | Polymère conformable pour emplacements de chauffage pouvant être sélectionnés en fréquence |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
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JPS6041881B2 (ja) * | 1979-12-17 | 1985-09-19 | 松下電器産業株式会社 | 帯域通過「ろ」波器 |
US5187459A (en) * | 1991-11-18 | 1993-02-16 | Raytheon Company | Compact coupled line filter circuit |
JP3866231B2 (ja) * | 2003-09-04 | 2007-01-10 | Tdk株式会社 | 積層型バンドパスフィルタ |
KR100576773B1 (ko) * | 2003-12-24 | 2006-05-08 | 한국전자통신연구원 | 종단 결합된 sir들을 이용한 마이크로스트립대역통과필터 |
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2011
- 2011-02-10 FR FR1100408A patent/FR2971629A1/fr active Pending
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2012
- 2012-02-10 WO PCT/EP2012/052271 patent/WO2012107543A1/fr active Application Filing
- 2012-02-10 ES ES12703121.9T patent/ES2627835T3/es active Active
- 2012-02-10 EP EP12703121.9A patent/EP2673831B1/fr active Active
- 2012-02-10 US US13/983,997 patent/US9362604B2/en active Active
Non-Patent Citations (1)
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See references of WO2012107543A1 * |
Also Published As
Publication number | Publication date |
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WO2012107543A1 (fr) | 2012-08-16 |
EP2673831B1 (fr) | 2017-03-22 |
FR2971629A1 (fr) | 2012-08-17 |
ES2627835T3 (es) | 2017-07-31 |
US20140159834A1 (en) | 2014-06-12 |
US9362604B2 (en) | 2016-06-07 |
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