EP1303001A1 - Breitbandiger Microstrip-Richtkoppler - Google Patents
Breitbandiger Microstrip-Richtkoppler Download PDFInfo
- Publication number
- EP1303001A1 EP1303001A1 EP01124552A EP01124552A EP1303001A1 EP 1303001 A1 EP1303001 A1 EP 1303001A1 EP 01124552 A EP01124552 A EP 01124552A EP 01124552 A EP01124552 A EP 01124552A EP 1303001 A1 EP1303001 A1 EP 1303001A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- lines
- directional coupler
- line
- coupling
- sections
- 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
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
- H01P5/00—Coupling devices of the waveguide type
- H01P5/12—Coupling devices having more than two ports
- H01P5/16—Conjugate devices, i.e. devices having at least one port decoupled from one other port
- H01P5/18—Conjugate devices, i.e. devices having at least one port decoupled from one other port consisting of two coupled guides, e.g. directional couplers
- H01P5/184—Conjugate devices, i.e. devices having at least one port decoupled from one other port consisting of two coupled guides, e.g. directional couplers the guides being strip lines or microstrips
- H01P5/185—Edge coupled lines
Definitions
- the present invention relates to a broadband Directional coupler in microstrip technology.
- Such directional couplers are used in high and very high frequency applications used to go from one to the other a first line-guided signal a defined, generally small proportion to one to couple over the second line, and in particular to To tap control or monitoring purposes.
- Such a directional coupler generally includes a Substrate on which the two lines are galvanically isolated are passed through a coupling zone, in which are mutually capacitive and magnetic influence.
- signals can be on the first line the coupler in opposite directions run through.
- the directional coupler has a high Degree of directionality, i.e. if an input signal the directional coupler on the first line runs in one direction, that's what it is supposed to do signal evoked on the second line in this with predominant intensity too only spread in one direction.
- the directionality is achieved by the combined Utilization of capacitive and magnetic Coupling. If a point of the second line of capacitive to a signal carried on the first line is influenced, so signals go with him same phase in both directions of the second line out. With magnetic coupling of a point differ from him in different Directional signals in phase by 180 °. This property is used with directional couplers, by capacitive and magnetic coupling like that can be combined so that both are the same strong contributions to the generated in the second line Deliver signal, but the contributions for one in a first direction of the second line constructively overlay propagating signal and for one propagating in the opposite direction Overlay signal destructively.
- the two lines include between input / output connections 1, 2, 3, 4 of the directional coupler two coupling lines 5, 6, which are parallel to each other at a given distance stretch and each other in one of theirs Distance dependent extent predominantly magnetic influence.
- Each at the ends of the parallel Coupling lines 5, 6 are areas strong capacitive coupling in the form of each projecting other coupling line Conductor sections 7, which are locally predominantly capacitive Deliver coupling.
- Coupler is a good directionality for Frequencies attainable, the wavelength in the Lines four times the length of the coupling lines 5 or 6 corresponds. Is from this frequency deviated, the relative phase position changes the capacitive contributions of the projecting Head sections 7, a satisfactory directionality is therefore due to the construction principle only within a narrow band around this reachable around a frequency.
- the coupling zone reduce below this dimension, so should one by the presence of the coupling capacity conditional interference with the help of inductive or compensate capacitive auxiliary structures that are arranged outside the coupling zone. There but this in turn depends on the wavelength Distance from the coupling zone must result, that the compensation only for a limited Frequency band is effective. So the bandwidth, in which a directional coupler is a satisfactory one Has directionality, with the conventional design principle only improve within narrow limits, and is also a downsizing of the directional coupler hardly possible.
- An object of the present invention is to provide a Directional coupler with a new design principle to indicate the at low consumption Substrate area has a very wide range.
- Another object of the invention is one To create directional couplers with reduced radiation.
- unconnected conductor surface simplifies that Function of a series connection of two capacitors, being a first capacitor through the first Line and one of these facing edge of the unconnected Conductor surface and the second through the second line and an edge facing this the conductor surface is formed.
- This construction allows by varying the shape of the conductor surface the coupling capacity between the first and second line to vary widely without that hereby changes in parasitic capacitances are connected to the appropriate extent.
- the two lines of the Directional coupler outside the coupling zone in two directions perpendicular to each other. This will make one mutual magnetic interference of the lines largely outside the coupling zone locked out.
- each line consists of two rectilinear sections that exist in the coupling zone immediately forming an angle meet each other, the angles so spanned have a common bisector.
- the sections of the lines of the directional coupler are each preferably in the form of a strip end edges perpendicular to the edges of the strip. This enables an arrangement in which the two sections of each line each with an Ekke overlap their end edge. By suitable Choice of the width of this overlap area can be a weak inductive behavior of the first or second line can be achieved. Such one Behavior is desirable to the capacitive Influence of the unconnected conductor surface on the reflection behavior the lines to compensate.
- the unconnected conductor surface preferably has one square outline, especially with the end edges facing the strip-shaped line sections Edge.
- a directional coupler is symmetrical with respect to a first axis of symmetry, with a reflection on the first axis of symmetry each of the two lines is carried over so symmetrical of the direction of propagation of a signal on the first or second line independent behavior of the directional coupler to achieve.
- the conductor surface consists of two the first or second lines facing, by a extending along the first axis of symmetry web-shaped conductor piece connected sections is constructed. This web-shaped conductor piece ensures that the presence of the unconnected Conductor surface only the capacitive coupling between first and second lines, not but affects the inductive coupling. It runs preferably along the axis of symmetry.
- the sections facing the first or second line are preferably L-shaped, in particular each with an end edge of a straight line Line section opposite leg.
- the directional coupler is constructed from a substrate 10, for example from Al 2 O 3 , which has a metallization layer on its underside, which is not shown in the figure, and on its top side two lines 11, 12 produced using microstrip technology and one with both lines between them 11, 12 unconnected conductor surface 20 carries. Sections of the first and second lines 11, 12 which are parallel to one another and run on both sides of the unconnected conductor area 20 are designated as first and second coupling lines 15 and 16; together with the conductor surface 20, they form the coupling zone of the directional coupler.
- the lines 11, 12 and the unconnected conductor surface 20 are in a same operation, through local application of metal or local removal a continuous metallization, formed and therefore have the same composition and layer thickness.
- Straight line sections 13-1, 13-2, 13-3, 13-4 each extend from points 1, 2, 3, 4 the lines 11, 12 to one end of the coupling line 15 or 16.
- Points 1 to 4 will be followed in the series after as the first input port, first output port, second output connection or second Designated input port, the distinction between input and output connections is terminological in nature and not technical Differences implied.
- the labels are on an arbitrarily chosen direction of propagation of a Signals received on the first line: if this via the first input connection 1 in the Coupler enters and through the first output port 2 emerges, so the decoupled Signal portion appear at the second output terminal 3; possibly on the second input connection 4 appearing signal component is undesirable.
- Ports 1 to 4 can be used if the directional coupler formed alone on the substrate 10 actual ends of lines 11, 12 be the substrate; when he's using other components integrated together on a substrate, it can between any points on a track between the directional coupler and another component.
- the line section 13-1 is perpendicular to the Sections 13-2 and 13-3 as well as parallel to the section 13-4 oriented to magnetic coupling section 13-1 to prevent 13-2 and 13-3.
- the lines 11, 12 go through mirroring on a first line of symmetry 18 in itself yourself over.
- the second line 12 is related to a second Line of symmetry 19 that is perpendicular to the first line of symmetry 18 runs, mirror image of the first Line 11 formed.
- the coupling lines 15, 16 extends with this unconnected, the conductor surface 20.
- This construction allows, given the geometry of the first and second coupling lines 15, 16 and thus given magnetic coupling the capacitive coupling between the lines by varying the To change the width of column 21 to a large extent, without changing the shape and Position of the first and second lines 11 to 16 must be connected, and consequently without an essential one Change the parasitic on this line Capacities.
- the capacitive coupling is in the design 2 over the entire length of each other parallel coupling conductor 15, 16 evenly distributed and just as strong as the magnetic coupling.
- the length of the coupling lines so reduce as much as possible.
- the length of the coupling lines 15, 16 is therefore in any case significantly smaller than ⁇ 1 / 4 if ⁇ 1 is the shorter of is two wavelengths ⁇ 1, ⁇ 2, each of the upper and lower limit frequency of a frequency band correspond in which the coupler is effective.
- the shortness of the coupling zone and on the other hand the same strength of the magnetic and the capacitive coupling ensure that within the frequency band in which the coupler is effective is not to build up resonances in the coupling zone can. There is therefore no resonant current surge in the coupling zone, and as a result the radiation is low.
- the behavior of the Directional coupler is therefore only slightly emitted by and on the metallization on the opposite Reflected fields influenced substrate side. Therefore, there can be a larger phase shift between that in the coupling zone on one of the lines 11 or 12 fed signal and these reflected fields in the coupling zone to be accepted as in the case described at the beginning conventional design principle.
- Directional coupler on comparatively thick, stable Substrates that are simple and made with good yield can be, or for a given substrate thickness an operation of the directional couplers in comparison high frequencies.
- FIG. 3 A more advanced design that has the advantages the configuration shown above and others is shown in Fig. 3.
- the straight sections 13-1 and 13-2 of the first Line 11 and 13-3, 13-4 of the second line 12 each meet directly at a right angle on the first line of symmetry 18 on one another.
- the Lines 13-1 to 13-4 each have the shape of Stripes with parallel longitudinal edges and one too the longitudinal edges vertical end edge 14, and them overlap each other in the area of an eck the end edge, as in the example of the first line 11 shown as a dashed square 22.
- the unconnected conductor surface 20 ' has the shape here of a square, each parallel to the end edges 14 Edge.
- the length of the coupling zone is minimized here is of a division the conductor surface 20 'into several partial surfaces no additional suppression along the line of symmetry 19 of magnetic coupling across the conductor surface Expected 20 '; rather, it can be assumed that such a division here is magnetic Coupling promotes.
- FIG. 4 Another improvement is on the top view 4 shown.
- Sections 23 “, 24” are each essentially L-shaped, with legs of equal length, the end edges 14 of the straight line sections 13-1, 13-2, 13-3, 13-4 facing are.
- the section 25 " has the shape of an elongated one Steges and connects the vertices the L-shaped sections 23 ", 24" along the first Line of symmetry 18.
- a fine adjustment of the capacitive coupling can by optimizing the width e of the legs of the L-shaped Sections and the width d of the column between the L-shaped sections 23 ", 24" and the end edges 22 of the lines can be reached.
- Figs. 6 and 7 each show for different signal frequencies the strength S (1.3) of the desired from the first input port 1 to the second output port 3 transmitted signal and S (1.4) the unwanted one at the second input port 4 appearing signals for a directional coupler the specified values of parameters a to e. you recognizes an excellent directionality with a Level difference of over 20 dB between the two Signals S (1.3) and S (1.4) examined throughout Frequency range from 19 to 27 GHz.
- the phase drift of the signal at the second output terminal 3 in Dependence on the frequency is small like that Smith chart of Fig. 7 shows.
- the present invention provides an extremely compact directional coupler with large Bandwidth and excellent directionality. While extremely thin with conventional directional couplers Substrates need to be used even at high Satisfactory directionality at working frequencies can achieve within the scope of the present invention relatively thick substrates are used what the durability of the coupler and also the yield improved in series production and thereby Reduced costs.
Landscapes
- Control Of Motors That Do Not Use Commutators (AREA)
- Surface Acoustic Wave Elements And Circuit Networks Thereof (AREA)
- Waveguides (AREA)
- Coupling Device And Connection With Printed Circuit (AREA)
- Waveguide Connection Structure (AREA)
Abstract
Description
- Fig. 1,
- bereits diskutiert, eine Draufsicht auf einen herkömmlichen Richtkoppler;
- Figs. 2 bis 4
- jeweils Draufsichten auf Richtkoppler nach einem ersten bis dritten Ausführungsbeispiel der vorliegenden Erfindung;
- Fig. 5
- ein Smith-Diagramm der Reflexion einer einzelnen Leitung des Richtkopplers aus Fig. 4;
- Fig. 6
- Signalstärken an der zweiten Ausgangsleitung und der zweiten Eingangsleitung des Richtkopplers aus Fig. 4 bei Anregung über die erste Eingangsleitung für verschiedene Frequenzen des Anregungssignals; und
- Fig. 7
- ein Smith-Diagramm der erwünschten und der unerwünschten Kopplung des Richtkopplers aus Fig. 4.
- Substratmaterial und Dicke.
Diese Parameter sind im wesentlichen für die maximale Arbeitsfrequenz relevant, bei der der Koppler eingesetzt werden soll. Generell sind zur Verringerung von Abstrahlung geringe Substratdicken bevorzugt. Bei Arbeitsfrequenzen bis zu 30 GHz ist ein Aluminiumoxidsubstrat mit einer Dicke von 381 µm geeignet. Bei Frequenzen oberhalb 30 GHz ist eine Dicke von 254 µm bevorzugt. - Breite der Leitungen.
Die Breite a der Leitungen 11 bis 14 ist im wesentlichen relevant für die Leitungsimpedanz des Systems. Für eine Impedanz der Leitungen 11 bis 14 von 50 Ω ist eine Breite a von 340 µm optimal. - Breite b der Überschneidungszone 22.
Dieser Parameter beeinflußt das Reflexionsverhalten der Leitungen. Je kleiner b ist, um so stärker induktiv ist das Reflexionsverhalten. Es ist wünschenswert, wenn die zwei Leitungen 11, 12, betrachtet ohne die Leiterfläche 20 und die jeweils andere Leitung 12 bzw. 11, schwach induktives Verhalten aufweisen, wie im Smith-Diagramm von Fig. 5 für die erste Eingangsleitung dargestellt. Die Reflexion S(1,1) am Eingang der ersten Leitung ist im betrachteten Frequenzbereich von 19 bis 27 GHz praktisch unveränderlich. Das schwach induktive Verhalten der Reflexion S(1,1) wird beim vollständigen Richtkoppler durch den kapazitiven Beitrag der Leiterfläche 20 im wesentlichen kompensiert, so daß insgesamt minimale Reflexion erreicht wird. - minimaler Abstand zwischen ersten und zweiten
Leitungen.
Der Abstand c zwischen einander zugewandten Ecken der Endkanten 22 der ersten und zweiten Leitungen 11, 12 hat offensichtlich Einfluß auf die Stärke der Kopplung zwischen diesen Leitungen. Er wird vorzugsweise so gewählt, daß die rechnerische Simulation eines Richtkopplers, der nur aus erster und zweiter Leitung 11, 12, ohne die unverbundene Leiterfläche 20, besteht, eine Kopplung zwischen der ersten und zweiten Leitung ergibt, die um ca. 5 dB geringer als die gewünschte Kopplung ist. Fügt man die unverbundene Leiterfläche 20" ein, um gleich starke magnetische und kapazitive Kopplungen zu erhalten, so erhöht sich die Kopplung insgesamt um etwa 5dB.
Claims (11)
- Richtkoppler mit einem Substrat und, angeordnet auf dem Substrat, zwei durch eine erste Leitung (11) verbundenen ersten Anschlüssen (1, 2) und zwei durch eine zweite Leitung (12) verbundenen zweiten Anschlüssen (3, 4), wobei die Leitungen (11, 12) durch eine Kopplungszone verlaufen, dadurch gekennzeichnet, dass die Leitungen (11, 12) in der Kopplungszone durch eine mit den Leitungen unverbundene Leiterfläche (20, 20', 20") beabstandet sind.
- Richtkoppler mit einem Substrat und, angeordnet auf dem Substrat, zwei durch eine erste Leitung (11) verbundenen ersten Anschlüssen (1, 2) und zwei durch eine zweite Leitung (12) verbundenen zweiten Anschlüssen (3, 4), wobei die Leitungen (11, 12) durch eine Kopplungszone verlaufen, zum gerichteten Überkoppeln eines Signals mit einer Wellenlänge innerhalb eines Bandes [λ1, λ2] von einer der zwei Leitungen (11, 12) auf die andere Leitung (12, 11), dadurch gekennzeichnet, dass die Kopplungszone kürzer als ein Viertel der kürzesten Wellenlänge λ1 des Bandes ist und dass an jedem Ort der Kopplungszone magnetische und kapazitive Kopplung gleich stark sind.
- Richtkoppler nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die Leitungen (11, 12) außerhalb der Kopplungszone in zwei zueinander senkrechten Richtungen verlaufen.
- Richtkoppler nach Anspruch 1, 2 oder 3, dadurch gekennzeichnet, dass jede Leitung (11; 12) zwei geradlinige Abschnitte (13-1, 13-2; 13-3, 13-4) umfasst, die in der Kopplungszone unter Bildung eines Winkels unmittelbar aufeinander treffen, wobei die Winkelhalbierende (18) für die Winkel beider Leitungen (11, 12) die gleiche ist.
- Richtkoppler nach Anspruch 4, dadurch gekennzeichnet, dass die Abschnitte (13-1, 13-2, 13-3, 13-4) streifenförmig mit einer zu den Rändern des Streifens senkrechten Endkante (14) sind, und dass sich die zwei Abschnitte (13-1, 13-2; 13-3, 13-4) jeder Leitung (11, 12) jeweils mit einer Ecke ihrer Endkante (14) überschneiden.
- Richtkoppler nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Leiterfläche (20', 20") einen quadratischen Umriss hat.
- Richtkoppler nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Leiterfläche (20") aus zwei jeweils der ersten bzw. zweiten Leitung zugewandten, durch ein stegförmiges Leiterstück (25") verbundenen Abschnitten (23", 24") aufgebaut ist.
- Richtkoppler nach Anspruch 7, dadurch gekennzeichnet, dass er eine erste Symmetrieachse (18) aufweist, wobei eine Spiegelung an der ersten Symmetrieachse (18) jede Leitung (11, 12) in sich überführt, und dass das stegförmige Leiterstück (25") entlang der Symmetrieachse verläuft.
- Richtkoppler nach Anspruch 7 oder 8, dadurch gekennzeichnet, dass die Abschnitte (23", 24") L-förmig sind.
- Richtkoppler nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Leitungen (11, 12) in der Kopplungszone jeweils ein schwach induktives Verhalten aufweisen.
- Richtkoppler nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die unverbundene Leiterfläche (20, 20', 20") einen Beitrag von ca. 5 dB zur kapazitiven Kopplung zwischen den ersten und den zweiten Leitungen leistet.
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE50105629T DE50105629D1 (de) | 2001-10-13 | 2001-10-13 | Breitbandiger Microstrip-Richtkoppler |
EP01124552A EP1303001B1 (de) | 2001-10-13 | 2001-10-13 | Breitbandiger Microstrip-Richtkoppler |
AT01124552T ATE291280T1 (de) | 2001-10-13 | 2001-10-13 | Breitbandiger microstrip-richtkoppler |
US10/269,727 US6998936B2 (en) | 2001-10-13 | 2002-10-11 | Broadband microstrip directional coupler |
CN02152923.XA CN1254879C (zh) | 2001-10-13 | 2002-10-12 | 宽带微波传输带定向耦合器 |
NO20024943A NO20024943D0 (no) | 2001-10-13 | 2002-10-14 | Bredbåndet retningskobler av mikrobåndledertype |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP01124552A EP1303001B1 (de) | 2001-10-13 | 2001-10-13 | Breitbandiger Microstrip-Richtkoppler |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1303001A1 true EP1303001A1 (de) | 2003-04-16 |
EP1303001B1 EP1303001B1 (de) | 2005-03-16 |
Family
ID=8178961
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP01124552A Expired - Lifetime EP1303001B1 (de) | 2001-10-13 | 2001-10-13 | Breitbandiger Microstrip-Richtkoppler |
Country Status (6)
Country | Link |
---|---|
US (1) | US6998936B2 (de) |
EP (1) | EP1303001B1 (de) |
CN (1) | CN1254879C (de) |
AT (1) | ATE291280T1 (de) |
DE (1) | DE50105629D1 (de) |
NO (1) | NO20024943D0 (de) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3988698B2 (ja) * | 2003-08-08 | 2007-10-10 | 株式会社村田製作所 | 方向性結合器および高周波回路装置 |
DE102006003954A1 (de) * | 2006-01-26 | 2007-08-02 | Sick Ag | Lichtgitter |
US7339366B2 (en) * | 2006-06-27 | 2008-03-04 | Analog Devices, Inc. | Directional coupler for a accurate power detection |
KR101088981B1 (ko) | 2010-02-22 | 2011-12-01 | 경희대학교 산학협력단 | 초광대역 방향성 결합기 |
RU2494502C2 (ru) * | 2011-10-18 | 2013-09-27 | Федеральное государственное унитарное предприятие "Ростовский-на-Дону научно-исследовательский институт радиосвязи" (ФГУП "РНИИРС") | Миниатюрный широкополосный квадратурный направленный ответвитель на элементах с сосредоточенными параметрами |
RU2534956C1 (ru) * | 2013-10-04 | 2014-12-10 | Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Национальный исследовательский университет "МЭИ" | ШИРОКОПОЛОСНЫЙ ФАЗОВРАЩАТЕЛЬ НА π/2 |
CN103887586A (zh) * | 2014-02-21 | 2014-06-25 | 中国人民解放军总参谋部第六十三研究所 | 一种微带线定向耦合器 |
KR102302423B1 (ko) * | 2020-10-28 | 2021-09-15 | 한화시스템 주식회사 | 마이크로스트립 방향성 결합기 |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3496492A (en) * | 1965-09-30 | 1970-02-17 | Siemens Ag | Microwave strip-in-trough line |
US4027254A (en) * | 1975-02-11 | 1977-05-31 | The Secretary Of State For Defence In Her Britannic Majesty's Government Of The United Kingdom Of Great Britain And Northern Ireland | Directional coupler having interdigital comb electrodes |
JPS56138302A (en) * | 1980-03-31 | 1981-10-28 | Japan Radio Co Ltd | Directional coupler for microstrip line |
US4376921A (en) * | 1981-04-28 | 1983-03-15 | Westinghouse Electric Corp. | Microwave coupler with high isolation and high directivity |
US4394630A (en) * | 1981-09-28 | 1983-07-19 | General Electric Company | Compensated directional coupler |
US4999593A (en) * | 1989-06-02 | 1991-03-12 | Motorola, Inc. | Capacitively compensated microstrip directional coupler |
US5159298A (en) * | 1991-01-29 | 1992-10-27 | Motorola, Inc. | Microstrip directional coupler with single element compensation |
US5424694A (en) * | 1994-06-30 | 1995-06-13 | Alliedsignal Inc. | Miniature directional coupler |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3495492A (en) | 1969-05-05 | 1970-02-17 | Gerber Garment Technology Inc | Apparatus for working on sheet material |
US4028643A (en) * | 1976-05-12 | 1977-06-07 | University Of Illinois Foundation | Waveguide having strip dielectric structure |
DE19605569A1 (de) * | 1996-02-15 | 1997-08-21 | Daimler Benz Aerospace Ag | Richtkoppler für den Hochfrequenzbereich |
-
2001
- 2001-10-13 DE DE50105629T patent/DE50105629D1/de not_active Expired - Lifetime
- 2001-10-13 EP EP01124552A patent/EP1303001B1/de not_active Expired - Lifetime
- 2001-10-13 AT AT01124552T patent/ATE291280T1/de not_active IP Right Cessation
-
2002
- 2002-10-11 US US10/269,727 patent/US6998936B2/en not_active Expired - Lifetime
- 2002-10-12 CN CN02152923.XA patent/CN1254879C/zh not_active Expired - Fee Related
- 2002-10-14 NO NO20024943A patent/NO20024943D0/no unknown
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3496492A (en) * | 1965-09-30 | 1970-02-17 | Siemens Ag | Microwave strip-in-trough line |
US4027254A (en) * | 1975-02-11 | 1977-05-31 | The Secretary Of State For Defence In Her Britannic Majesty's Government Of The United Kingdom Of Great Britain And Northern Ireland | Directional coupler having interdigital comb electrodes |
JPS56138302A (en) * | 1980-03-31 | 1981-10-28 | Japan Radio Co Ltd | Directional coupler for microstrip line |
US4376921A (en) * | 1981-04-28 | 1983-03-15 | Westinghouse Electric Corp. | Microwave coupler with high isolation and high directivity |
US4394630A (en) * | 1981-09-28 | 1983-07-19 | General Electric Company | Compensated directional coupler |
US4999593A (en) * | 1989-06-02 | 1991-03-12 | Motorola, Inc. | Capacitively compensated microstrip directional coupler |
US5159298A (en) * | 1991-01-29 | 1992-10-27 | Motorola, Inc. | Microstrip directional coupler with single element compensation |
US5424694A (en) * | 1994-06-30 | 1995-06-13 | Alliedsignal Inc. | Miniature directional coupler |
Also Published As
Publication number | Publication date |
---|---|
US20030085773A1 (en) | 2003-05-08 |
CN1420577A (zh) | 2003-05-28 |
ATE291280T1 (de) | 2005-04-15 |
US6998936B2 (en) | 2006-02-14 |
NO20024943D0 (no) | 2002-10-14 |
DE50105629D1 (de) | 2005-04-21 |
CN1254879C (zh) | 2006-05-03 |
EP1303001B1 (de) | 2005-03-16 |
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