EP0247542A1 - Integrated microwave circuit - Google Patents

Integrated microwave circuit Download PDF

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Publication number
EP0247542A1
EP0247542A1 EP87107507A EP87107507A EP0247542A1 EP 0247542 A1 EP0247542 A1 EP 0247542A1 EP 87107507 A EP87107507 A EP 87107507A EP 87107507 A EP87107507 A EP 87107507A EP 0247542 A1 EP0247542 A1 EP 0247542A1
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Prior art keywords
stub
line
component
element according
strip
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Granted
Application number
EP87107507A
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German (de)
French (fr)
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EP0247542B1 (en
Inventor
Friedrich Dr.-Ing. Lange
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Siemens AG
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Siemens AG
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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
    • H01P1/207—Hollow waveguide filters
    • H01P1/209—Hollow waveguide filters comprising one or more branching arms or cavities wholly outside the main waveguide

Definitions

  • the invention relates to an integrated microwave circuit according to the preamble of claim 1.
  • a Y-branching circulator for use in integrated microwave circuits in which a continuous metallic coating is arranged on one side of the substrate and a circulator with strip lines leading away from the branching point is arranged on the other side. Idle stub lines are connected to the strip lines, the fine adjustment of the input impedance of the circulator is carried out by removing the length of the stub lines.
  • FIG. 1 shows an integrated microwave circuit according to the prior art, in which a component 2 with connected strip lines 3 and 4 is arranged on a substrate 1.
  • a metallic coating 5 is applied, which is connected to the reference potential.
  • An interference capacitance 6 is effective between the two connections of the component 2 and can spread in a value range C min ... C max .
  • the integrated microwave circuit must now be adjusted for the operating frequency so that the interference capacity is ineffective. This can be done by an inductance connected in parallel to the interference capacitance, but the size of which is not exactly known due to the fluctuations in the interference capacitance.
  • the object of the invention is therefore to switch a balancing element of the type mentioned at the outset, which results in a parallel inductance at the operating frequency, which generates the smallest possible additional capacitances and is easy to balance.
  • 2 a in turn contains the component 2 with the strip lines 3 and 4 as supply lines and the indicated interference capacity 6.
  • the stub lines 12 and 14 are provided, which are designed as coupled strip lines and of which in each case one strip is connected to the feed line 3 and the other strip to the feed line 4 for the component 2.
  • the stub 12 is terminated by a line short circuit 13 so that the inductance L 1 thereby generated compensates for the minimum interference capacitance C min at the operating frequency f0, ie at the center frequency of the operating bandwidth, that is to say that
  • the second stub 14 is terminated by a strip line 15 so that the inductance L2 thus generated is initially "infinitely" large and the inductors L 3.1 and L 3.2 generated the capacitances C 1.1 and C 1.2 of the first Strip line 12 to compensate for ground, that is At a variable distance from the component 2, a bond wire 16 is additionally arranged on the strip line 14, through which the inductance L 2 is reduced to such an extent that the resulting inductance L K the interference capacity at the operating frequency is compensated. So it has to be.
  • FIG. 2b shows the equivalent circuit diagram of the arrangement according to FIG. 2a.
  • the inductance L2 initially generated by the connected stub 14 is the inductance L1, which is generated by the short-circuited coupled strip line 12, directly connected in parallel.
  • the capacitances C 1.1 , C 1.2 generated by the coupled strip line 12 and the line short circuit 13 against ground act at the two connection points of the inductors L 1 and L 2 against ground.
  • the chosen termination of the strip line 14 results in the inductances L 3.1 and L 3.2 parallel to these capacitances. Parallel to the inductances L1 and L2, the component 2 with the interference capacitance Cs is effective, this interference capacitance corresponds to the indicated capacitor 6 according to FIG. 2a.
  • FIG. 3 shows a modification of the arrangement according to FIG. 2a.
  • a series of bond wires 17, 18 .... 22 are attached to the strip line 14.
  • the first additional bond wire 17 is placed so that the trimming element is thus suitable for compensating for the maximum interference capacitance C max , that is to say the effective inductance is. If the resonance frequency of the arrangement then with the operating frequency does not yet match, the additional bond wires 17, 18 ... are removed in succession until the resonance frequency f R corresponds to the condition coincides with the operating frequency.
  • dielectric plates can therefore be arranged on the stub 14 between the component (2) and the first bond wire not removed and / or on the stub 12.
  • the stub lines can be modified in accordance with FIG. 4 in order to reduce the ground capacitances C 1.1 and C 1.2 of the stub line 12 and to obtain suitable inductances L 3.1 and L 3.2 against ground.
  • 4 shows parts of coupled strip lines, the termination of which is modified.
  • 4a shows a strip line 24 of length l which is open at the end and
  • FIG. 4b shows a strip line 25 of length lstructure which is short-circuited to the ground layer.

Abstract

An integrated microwave circuit having a dielectric substrate on the one side of which there is arranged a penetrating metallic coating and on the other side of which there is arranged at least one component (2) with two strip lines (3, 4) connected to it, and having at least one tuning element (12). In this case, the tuning element is used for compensating for the interfering parallel capacitance (6) of the component, by generating an inductance. The tuning element contains at least one coupled strip line, which is short-circuited at the end (13), is arranged on the substrate and whose terminals are connected to the component leads. With respect to minimising the earth capacitance of the tuning element, preferably two additional short-circuited, coupled strip lines (12, 14) are provided, which are arranged on both sides of the active component of the integrated microwave circuit. <IMAGE>

Description

Die Erfindung betrifft einen integrierten Mikrowellen­schaltkreis entsprechend dem Oberbegriff des Patentan­spruchs 1.The invention relates to an integrated microwave circuit according to the preamble of claim 1.

Aus der DE-PS 22 53 176 ist ein Y-Verzweigungszirkulator für die Verwendung in integrierten Mikrowellen-Schalt­kreisen bekannt, bei dem auf einer Seite des Substrats ein durchgehender metallischer Belag und auf der anderen Seite ein Zirkulator mit vom Verzweigungspunkt wegführen­den Streifenleitungen angeordnet ist. An die Streifen­leitungen sind leerlaufende Stichleitungen angeschaltet, die Feineinstellung der Eingangsimpedanz des Zirkulators erfolgt durch Längenabtragung der Stichleitungen.From DE-PS 22 53 176 a Y-branching circulator for use in integrated microwave circuits is known, in which a continuous metallic coating is arranged on one side of the substrate and a circulator with strip lines leading away from the branching point is arranged on the other side. Idle stub lines are connected to the strip lines, the fine adjustment of the input impedance of the circulator is carried out by removing the length of the stub lines.

In der Fig. 1 ist eine integrierte Mikrowellenschaltung nach dem Stande der Technik dargestellt, bei der auf einem Substrat 1 ein Bauteil 2 mit angeschlossenen Strei­fenleitungen 3 und 4 angeordnet ist. Auf der Rückseite des Substrats ist ein metallischer Belag 5 aufgebracht, der mit Bezugspotential verbunden ist. Zwischen den beiden Anschlüssen des Bauteils 2 ist eine Störkapazität 6 wirk­sam, die in einem Wertebereich Cmin...Cmax streuen kann. Die integrierte Mikrowellenschaltung ist nun für die Be­triebsfrequenz so abzugleichen, daß die Störkapazität unwirksam wird. Dies kann durch eine zur Störkapazität parallel geschaltete Induktivität geschehen, deren Größe aber wegen der Schwankungen der Störkapazität nicht genau bekannt ist.1 shows an integrated microwave circuit according to the prior art, in which a component 2 with connected strip lines 3 and 4 is arranged on a substrate 1. On the back of the substrate, a metallic coating 5 is applied, which is connected to the reference potential. An interference capacitance 6 is effective between the two connections of the component 2 and can spread in a value range C min ... C max . The integrated microwave circuit must now be adjusted for the operating frequency so that the interference capacity is ineffective. This can be done by an inductance connected in parallel to the interference capacitance, but the size of which is not exactly known due to the fluctuations in the interference capacitance.

Die Aufgabe der Erfindung besteht also darin, ein Ab­gleichelement der eingangs erwähnten Art zu schalten, das bei der Betriebsfrequenz eine Parallelinduktivität ergibt, die möglichst geringe zusätzliche Kapazitäten erzeugt und leicht abgleichbar ist.The object of the invention is therefore to switch a balancing element of the type mentioned at the outset, which results in a parallel inductance at the operating frequency, which generates the smallest possible additional capacitances and is easy to balance.

Erfindungsgemäß wird die Aufgabe durch ein Abgleichele­ment der eingangs erwähnten Art gelöst, das die kenn­zeichnenden Merkmale des Patentanspruchs 1 aufweist.According to the invention, the object is achieved by a balancing element of the type mentioned at the outset, which has the characterizing features of patent claim 1.

Zweckmäßige Weiterbildungen des erfindungsgemäßen Ab­gleichelements sind in den Patentansprüchen 2 bis 6 näher beschrieben.Expedient developments of the balancing element according to the invention are described in more detail in claims 2 to 6.

Die Erfindung soll im folgenden anhand der Zeichnung näher erläutert werden.The invention will be explained in more detail below with reference to the drawing.

In der Zeichnung zeigt

  • Fig. 1 einen integrierten Mikrowellenschaltkreis nach dem Stande der Technik,
  • Fig. 2a ein erfindungsgemäßes Abgleichelement,
  • Fig. 2b eine Ersatzschaltung zur Fig. 2,
  • Fig. 3 eine Weiterbildung des Abgleichelements nach Fig. 2a,
  • Fig. 4a, b modifizierte Stichleitungen und
  • Fig. 5 ein Abgleichelement mit den modifizierten Stich­leitungen nach Fig. 4.
In the drawing shows
  • 1 shows an integrated microwave circuit according to the prior art,
  • 2a an adjustment element according to the invention,
  • 2b is an equivalent circuit to FIG. 2,
  • 3 shows a development of the adjustment element according to FIG. 2a,
  • Fig. 4a, b modified stubs and
  • 5 shows a balancing element with the modified stub lines according to FIG. 4.

Die Fig. 1 ist bei der Darstellung des Standes der Technik bereits erläutert worden, so daß an dieser Stelle nicht weiter darauf eingegangen wird.1 has already been explained in the illustration of the prior art, so that it will not be discussed further at this point.

Die Fig. 2 a enthält wiederum das Bauelement 2 mit den Streifenleitungen 3 und 4 als Zuleitungen sowie der ange­ deuteten Störkapazität 6.2 a in turn contains the component 2 with the strip lines 3 and 4 as supply lines and the indicated interference capacity 6.

Zusätzlich sind die Stichleitungen 12 und 14 vorgesehen, die als gekoppelte Streifenleitungen ausgebildet sind und von denen jeweils der eine Streifen mit der Zuleitung 3 und der andere Streifen mit der Zuleitung 4 für das Bau­element 2 verbunden sind. Die Stichleitung 12 ist durch einen Leitungskurzschluß 13 so abgeschlossen, daß die dadurch erzeugte Induktivität L₁ die minimale Störkapa­zität Cmin bei der Betriebsfrequenz f0 also bei der Mit­tenfrequenz der Betriebsbandbreite, kompensiert, daß also

Figure imgb0001
Die zweite Stichleitung 14 wird durch eine Streifenlei­tung 15 so abgeschlossen, daß die somit erzeugte Induk­tivität L₂ zunächst "unendlich" groß ist und die er­zeugten Induktivitäten L3,1 und L3,2 die Kapazitäten C1,1 und C1,2 der ersten Streifenleitung 12 gegen Masse kompensieren, daß also
Figure imgb0002
 In veränderlichen Abstand vom Bauelement 2 ist auf der Streifenleitung 14 zusätzlich ein Bonddraht 16 angeord­net, durch den die Induktivität L₂ soweit verringert wird, daß die entstehende Induktivität LK
Figure imgb0003
 die Störkapazität bei der Betriebsfrequenz kompensiert. Es muß also
Figure imgb0004
 sein.In addition, the stub lines 12 and 14 are provided, which are designed as coupled strip lines and of which in each case one strip is connected to the feed line 3 and the other strip to the feed line 4 for the component 2. The stub 12 is terminated by a line short circuit 13 so that the inductance L 1 thereby generated compensates for the minimum interference capacitance C min at the operating frequency f0, ie at the center frequency of the operating bandwidth, that is to say that
Figure imgb0001
 The second stub 14 is terminated by a strip line 15 so that the inductance L₂ thus generated is initially "infinitely" large and the inductors L 3.1 and L 3.2 generated the capacitances C 1.1 and C 1.2 of the first Strip line 12 to compensate for ground, that is
Figure imgb0002
 At a variable distance from the component 2, a bond wire 16 is additionally arranged on the strip line 14, through which the inductance L 2 is reduced to such an extent that the resulting inductance L K
Figure imgb0003
 the interference capacity at the operating frequency is compensated. So it has to
Figure imgb0004
 be.

Durch den Abstand des Bonddrahtes 16 zum Substrat ist dessen kapazitiver Einfluß vergleichsweise sehr gering, so daß die Kompensation gegen Masse durch diesen Bond­draht praktisch nicht beeinflußt wird.Due to the distance between the bond wire 16 and the substrate, its capacitive influence is comparatively very small, so that the compensation against ground is practically not influenced by this bond wire.

In der Fig. 2b ist das Ersatzschaltbild der Anordnung nach Fig. 2a dargestellt. Die durch die beschaltete Stich­leitung 14 zunächst erzeugte Induktivität L₂ ist der In­duktivität L₁, die von der kurzgeschlossenen gekoppelten Streifenleitung 12 erzeugt wird, direkt parallelgeschal­tet. Die durch die gekoppelte Streifenleitung 12 und den Leitungskurzschluß 13 gegen Masse erzeugten Kapazitäten C1,1, C1,2 wirken an den beiden Anschlußpunkten der In­duktivitäten L₁ und L₂ gegen Masse. Durch den gewählten Abschluß der Streifenleitung 14 ergeben sich parallel zu diesen Kapazitäten die Induktivitäten L3,1 und L3,2. Parallel zu den Induktivitäten L₁ und L₂ ist das Bauele­ment 2 mit der Störkapazität Cs wirksam, diese Störkapa­zität entspricht dem angedeuteten Kondensator 6 nach Fig. 2a.2b shows the equivalent circuit diagram of the arrangement according to FIG. 2a. The inductance L₂ initially generated by the connected stub 14 is the inductance L₁, which is generated by the short-circuited coupled strip line 12, directly connected in parallel. The capacitances C 1.1 , C 1.2 generated by the coupled strip line 12 and the line short circuit 13 against ground act at the two connection points of the inductors L 1 and L 2 against ground. The chosen termination of the strip line 14 results in the inductances L 3.1 and L 3.2 parallel to these capacitances. Parallel to the inductances L₁ and L₂, the component 2 with the interference capacitance Cs is effective, this interference capacitance corresponds to the indicated capacitor 6 according to FIG. 2a.

In der Fig. 3 ist eine Modifikation der Anordnung nach Fig. 2a dargestellt. Als Ersatz für den Bonddraht 16 sind auf der Streifenleitung 14 eine Reihe von Bond­drähten 17, 18 .... 22 angebracht. Dabei ist der erste zusätzliche Bonddraht 17 so plaziert, daß das Abgleich­element damit zur Kompensation der maximalen Störkapa­zität Cmax geeignet ist, daß also die wirksame Induk­tivität

Figure imgb0005
ist. Falls die Resonanzfrequenz der Anordnung dann mit der Betriebsfrequenz noch nicht übereinstimmt, werden nacheinander die zusätzlichen Bonddrähte 17, 18 ... ent­fernt, bis die Resonanzfrequenz fR entsprechend der Be­dingung
Figure imgb0006
 mit der Betriebsfrequenz übereinstimmt.FIG. 3 shows a modification of the arrangement according to FIG. 2a. As a replacement for the bond wire 16, a series of bond wires 17, 18 .... 22 are attached to the strip line 14. The first additional bond wire 17 is placed so that the trimming element is thus suitable for compensating for the maximum interference capacitance C max , that is to say the effective inductance
Figure imgb0005
 is. If the resonance frequency of the arrangement then with the operating frequency does not yet match, the additional bond wires 17, 18 ... are removed in succession until the resonance frequency f R corresponds to the condition
Figure imgb0006
 coincides with the operating frequency.

Wegen der begrenzten Anzahl möglicher zusätzlicher Bond­drähte kann ein Feinabgleich Schwierigkeiten bereiten. Zum Feinabgleich können deshalb auf der Stichleitung 14 zwischen dem Bauteil (2) und dem ersten nicht entfernten Bonddraht und/oder auf der Stichleitung 12 dielektrische Plättchen angeordnet werden.Because of the limited number of possible additional bond wires, fine adjustment can be difficult. For fine adjustment, dielectric plates can therefore be arranged on the stub 14 between the component (2) and the first bond wire not removed and / or on the stub 12.

Zur Verringerung der Massekapazitäten C1,1 und C1,2 der Stichleitung 12 und zum Erhalt geeigneter Induktivitäten L3,1 und L3,2 gegen Masse können die Stichleitungen ent­sprechend Fig. 4 modifiziert werden. In der Fig. 4 sind Teile gekoppelter Streifenleitungen dargestellt, deren Abschluß modifiziert ist. In der Fig. 4a ist eine am Ende offene Streifenleitung 24 der Länge l und in Fig. 4b eine gegen den Massebelag kurzgeschlossene Streifenleitung 25 der Länge lʹ dargestellt. Diese Anordnungen können mit den integrierten Mikrowellenschaltkreisen nach Fig. 2a und Fig. 3 kombiniert werden, so daß beispielsweise eine Anordnung entsprechend Fig. 5 entsteht.The stub lines can be modified in accordance with FIG. 4 in order to reduce the ground capacitances C 1.1 and C 1.2 of the stub line 12 and to obtain suitable inductances L 3.1 and L 3.2 against ground. 4 shows parts of coupled strip lines, the termination of which is modified. 4a shows a strip line 24 of length l which is open at the end and FIG. 4b shows a strip line 25 of length l Länge which is short-circuited to the ground layer. These arrangements can be combined with the integrated microwave circuits according to FIGS. 2a and 3, so that, for example, an arrangement corresponding to FIG. 5 is created.

Claims (6)

1. Integrierter Mikrowellenschaltkreis, der ein dielek­trisches Substrat enthält, auf dessen einer Seite ein durchgehender metallischer Belag und auf dessen anderer Seite wenigstens ein Bauteil mit zwei angeschlossenen Streifenleitungen angeordnet ist und an den wenigstens ein Abgleichelement angeschlossen ist,
dadurch gekennzeichnet,
daß zusätzlich wenigstens eine erste am Ende kurzge­schlossene gekoppelte Streifenleitung (12) als Stichlei­tung wenigstens annähernd rechtwinklig zu den an das Bau­teil (2) angeschlossenen Streifenleitungen (3,4) auf dem Substrat (1) angeordnet ist und daß jeweils ein Anschluß der gekoppelten Streifenleitung mit einer an das Bauteil (2) angeschlossenen Streifenleitung (34) verbunden ist.1. Integrated microwave circuit which contains a dielectric substrate, on one side of which a continuous metallic coating is arranged and on the other side at least one component with two connected strip lines and to which at least one matching element is connected,
characterized,
that in addition at least a first short-circuited coupled strip line (12) is arranged as a stub line at least approximately at right angles to the strip lines (3, 4) connected to the component (2) on the substrate (1) and that in each case one connection of the coupled strip line a strip line (34) connected to the component (2) is connected. 2. Abgleichelement nach Anspruch 1,
dadurch gekennzeichnet,
daß die erste Stichleitung (12) so bemessen ist, daß die dadurch erzeugte Induktivität nur die minimal mögliche Störkapazität bei der Betriebsfrequenz kompensiert.2. adjustment element according to claim 1,
characterized,
that the first stub line (12) is dimensioned such that the inductance thereby generated only compensates for the minimum possible interference capacitance at the operating frequency. 3. Abgleichelement nach Anspruch 1,
dadurch gekennzeichnet,
daß eine zweite gekoppelte Streifenleitung (14) als Stich­leitung vorgesehen ist, die so beschaltet ist, daß bei der Betriebsfrequenz eine vergleichsweise sehr große Induktivi­tät erzeugt wird und die Massekapazität des Abgleichelements minimiert wird und die auf der der ersten Stichleitung (12) gegenüberliegenden Seite des Bauteils (2), aber auf der gleichen Oberflächenseite des integrierten Mikrowellenschalt­kreises angeordnet ist.3. adjustment element according to claim 1,
characterized,
that a second coupled strip line (14) is provided as a stub line, which is connected so that a comparatively very large inductance is generated at the operating frequency and the mass capacitance of the balancing element is minimized and that on the side of the component opposite the first stub line (12) (2), but is arranged on the same surface side of the microwave integrated circuit. 4. Abgleichelement nach Anspruch 3,
dadurch gekennzeichnet,
daß durch einen zusätzlichen Bonddraht (16) an einer bestimmten Stelle der zweiten Stichleitung (14) diese kurzgeschlossen und damit deren wirksame Länge so verkürzt wird, daß die bei der Betriebsfrequenz auftretende effek­tive Störkapazität kompensiert wird.4. adjustment element according to claim 3,
characterized,
that an additional bond wire (16) short-circuits the second stub line (14) at a specific point and thus shortens its effective length so that the effective interference capacity occurring at the operating frequency is compensated for. 5. Abgleichelement nach Anspruch 4,
dadurch gekennzeichnet,
daß zunächst weitere Bonddrähte (17...22) über die Länge der Stichleitung verteilt auf dieser angebracht werden und ein Abgleich auf die effektive Störkapazität dadurch er­folgt, daß von der zu den Streifenleitungen (3,4) gerichte­ten Seite der Stichleitung (14) her die Bonddrähte (17...22) durchgetrennt werden.5. adjustment element according to claim 4,
characterized,
that first additional bond wires (17 ... 22) are distributed over the length of the stub and attached to it and a comparison to the effective interference capacitance takes place in that the side of the stub (14) facing the strip lines (3, 4) the bond wires (17 ... 22) are cut. 6. Abgleichelement nach einem der Ansprüche 1 bis 5,
dadurch gekennzeichnet,
daß zum Feinabgleich wenigstens ein dielektrisches Plätt­chen auf einer der Stichleitungen (12,14) angeordnet ist.6. adjustment element according to one of claims 1 to 5,
characterized,
that at least one dielectric plate is arranged on one of the stub lines (12, 14) for fine adjustment.
EP87107507A 1986-05-27 1987-05-22 Integrated microwave circuit Expired - Lifetime EP0247542B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87107507T ATE79983T1 (en) 1986-05-27 1987-05-22 INTEGRATED MICROWAVE CIRCUIT.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3617733 1986-05-27
DE3617733 1986-05-27

Publications (2)

Publication Number Publication Date
EP0247542A1 true EP0247542A1 (en) 1987-12-02
EP0247542B1 EP0247542B1 (en) 1992-08-26

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EP87107507A Expired - Lifetime EP0247542B1 (en) 1986-05-27 1987-05-22 Integrated microwave circuit

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AT (1) ATE79983T1 (en)
DE (1) DE3781326D1 (en)
ES (1) ES2033729T3 (en)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3516024A (en) * 1968-12-30 1970-06-02 Texas Instruments Inc Interdigitated strip line coupler
US3768050A (en) * 1971-05-19 1973-10-23 Motorola Inc Microwave integrated circuit
DE2317375A1 (en) * 1973-04-06 1974-10-24 Rohde & Schwarz IN STRIP LINE TECHNOLOGY, IN PARTICULAR THIN FILM TECHNOLOGY, BUILT-UP CIRCUIT WITH INDUCTIVITIES
DE2460695A1 (en) * 1974-12-20 1976-07-01 Siemens Ag Strip line microwave phase shift - has continuous line electrically distanced from parallel tap lines terminated by PIN dioes
US4001734A (en) * 1975-10-23 1977-01-04 Hughes Aircraft Company π-Loop phase bit apparatus
DE2541569A1 (en) * 1975-09-18 1977-03-31 Licentia Gmbh Frequency dependent attenuator for directional aerial system - has one shorted feeder shunting input and output gate and parallel open circuit feeder
EP0127527A1 (en) * 1983-05-31 1984-12-05 Thomson-Csf Adjustment method, especially a frequency adjustment method of a printed microstrip filter, and filter obtained by this method

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3516024A (en) * 1968-12-30 1970-06-02 Texas Instruments Inc Interdigitated strip line coupler
US3768050A (en) * 1971-05-19 1973-10-23 Motorola Inc Microwave integrated circuit
DE2317375A1 (en) * 1973-04-06 1974-10-24 Rohde & Schwarz IN STRIP LINE TECHNOLOGY, IN PARTICULAR THIN FILM TECHNOLOGY, BUILT-UP CIRCUIT WITH INDUCTIVITIES
DE2460695A1 (en) * 1974-12-20 1976-07-01 Siemens Ag Strip line microwave phase shift - has continuous line electrically distanced from parallel tap lines terminated by PIN dioes
DE2541569A1 (en) * 1975-09-18 1977-03-31 Licentia Gmbh Frequency dependent attenuator for directional aerial system - has one shorted feeder shunting input and output gate and parallel open circuit feeder
US4001734A (en) * 1975-10-23 1977-01-04 Hughes Aircraft Company π-Loop phase bit apparatus
EP0127527A1 (en) * 1983-05-31 1984-12-05 Thomson-Csf Adjustment method, especially a frequency adjustment method of a printed microstrip filter, and filter obtained by this method

Also Published As

Publication number Publication date
EP0247542B1 (en) 1992-08-26
ATE79983T1 (en) 1992-09-15
DE3781326D1 (en) 1992-10-01
ES2033729T3 (en) 1993-04-01

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