EP0718906B1 - Stripline filter - Google Patents
Stripline filter Download PDFInfo
- Publication number
- EP0718906B1 EP0718906B1 EP95118894A EP95118894A EP0718906B1 EP 0718906 B1 EP0718906 B1 EP 0718906B1 EP 95118894 A EP95118894 A EP 95118894A EP 95118894 A EP95118894 A EP 95118894A EP 0718906 B1 EP0718906 B1 EP 0718906B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- stripline
- coupling
- resonators
- filter according
- 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.)
- Expired - Lifetime
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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
Definitions
- the invention relates to a stripline filter according to the Preamble of claim 1.
- Such a stripline filter is from the US-A-5,248,949.
- metallizations on the top and bottom of a dielectric substrate galvanic connections in the form of metallizations End faces of the substrate provided.
- a microwave bandpass filter is known from EP-A-0 429 067, with the metallizations on the top and bottom of a dielectric substrate through metallized through holes are galvanically connected to each other.
- the coupling takes place the stripline resonators are usually capacitive by on the base of the ceramic substrate an area of the surrounding mass is electrically isolated, so that this Area to a separated by the dielectric on top a capacitance arranged on the ceramic substrate forms.
- This capacitance is according to the plate capacitor formula depending on the ⁇ of the dielectric, the thickness of the substrate and the size of the area. Slight fluctuations in the location of the Area can, if this coupling capacity z.
- B. for Injecting microwave power into a power resonator is needed, the frequency of the coupling change detuned resonator.
- the object of the present invention is therefore almost a resonance-free resonator for a stripline filter inexpensive to manufacture, even when coupled with others Low resonators for the production of appropriate filters Has resonance frequency tolerances and is narrow tolerance Coupling capacities.
- a ceramic substrate 1 is shown on the two stripline resonators 2 are arranged.
- Coupling metal surfaces 3 are by a galvanic isolation 4 separated from all-sided mass metallization.
- metal surfaces 5 are arranged, with the help of, preferably internally metallized, Through holes 6 with the coupling metal surfaces 3 are contacted.
- the coupling of the stripline filter thus takes place in that the through the dividing surfaces 4th Coupling metal surfaces galvanically separated from the surrounding mass 3 plated through to the other side of the ceramic substrate 1 are and the capacitive coupling with the stripline resonators 2 on the opposite side.
- the coupling is mainly increased by the Distance of the structures determined and not by the substrate thickness, which are preferably made of high-dielectric microwave ceramics consists.
- the substrate thickness which are preferably made of high-dielectric microwave ceramics consists.
- Through holes 6 can increase the adhesive strength of the coupling structure be significantly improved.
- the structure on the Base area can be mechanically or etched with clearly greater tolerances and thus possibly less effort become.
- the coupling can also be created using etching technology be, the location of the photo mask for the coupling capacity is less critical.
- the line structures can either be in thick-film technology (Screen printing with thick-film silver) or in thin-film technology (Copper etched).
- Another possibility is to pre-sinter the Press structure into the ceramic body. At distance The metallization on the top becomes the resonance frequency not or hardly influenced.
- the distance b between the stripline resonators 2 and determines the metal surfaces 5 of the coupling structure Size of the coupling capacity. Capacitive coupling accomplished the transformation of the low-resistance stripline resonator (typically 5 to 10 ⁇ ) to those in the Most applications require adjustment to 50 or 75 ⁇ .
- the distance a between the metal surfaces 5 of the coupling structure determines the size of the external coupling. over the setting of the capacity can be the location of the two Adjust notches of the filter characteristics to suit the application.
- the filter created in this way is characterized by low Insertion loss, high blocking selection and by high or complete freedom from comparison. It is also much flatter as a comparable one in its properties Coaxial resonators existing microwave ceramic filter.
- the stripline filter according to FIG. 1 is shown in FIG Side view shown.
- a further development of the two-pole filter described can consist of adding more stripline resonators increase the selection properties of the filter.
- an additional coupling capacitor 9th has the coupling structures additionally capacitive coupled.
- Through-contacts holes 12 or slots 13
- Through-contacts in addition to setting the coupling be used between the individual resonators 2.
- the embodiment 3 is in the area of the coupling structure the open side (metallization-free) 11 and opposite the short-circuit side 10.
- Another way to unilaterally improve Edge steepness is a line discontinuity in the form of a broadside jump in the resonator line 2 to create. This happens because either the stripline resonator 2 in the area of the short-circuit side 10 reduced cross-section (metal-free surface 8) or is widened in this area (additional metallization 7). In the first case, an inductive and second, a capacitive effect.
- Such filters with a broad side jump in the stripline resonators 2 are characterized in that the filter characteristic a steepening to lower frequencies having.
- the broadside jumps become the open side 11 mirrored, steepening to higher frequencies will be realized.
- the broadside jumps with capacitive Draw the effect is particularly characterized by the fact that the coupling is very reproducible because the line jump to the outside is led.
- the broadside jump can optionally also be carried out in this way be that one piece of the inner conductor is shifted against the other is. With this, the emergency strike can be added to adjust. Because this is an undercut acts, you can only this body in the previously described Make mold, i.e. it is not in one piece to press (monolithic).
- the stripline filter can insofar the losses be constructed asymmetrically that the ceramic substrate 1 thicker than the ceramic lid is.
- the unstressed quality of the resonators can be increased by up to 50% in this way.
Abstract
Description
Die Erfindung betrifft ein Streifenleitungsfilter nach dem Oberbegriff des Patentanspruch 1.The invention relates to a stripline filter according to the Preamble of claim 1.
Ein derartiges Streifenleitungsfilter ist aus der US-A-5,248,949 bekannt. Dabei sind zwischen Metallisierungen auf der Ober- und Unterseite eines dielektrischen Substrats galvanische Verbindungen in Form von Metallisierungen auf Stirnseiten des Substrats vorgesehen.Such a stripline filter is from the US-A-5,248,949. There are between metallizations on the top and bottom of a dielectric substrate galvanic connections in the form of metallizations End faces of the substrate provided.
Aus der EP-A-0 429 067 ist ein Mikrowellen-Bandpaßfilter bekannt, bei dem Metallisierungen auf der Ober- und Unterseite eines dielektrischen Substrates durch metallisierte Durchgangslöcher galvanisch miteinander verbunden sind.A microwave bandpass filter is known from EP-A-0 429 067, with the metallizations on the top and bottom of a dielectric substrate through metallized through holes are galvanically connected to each other.
Bei bekannten Streifenleistungsfiltern erfolgt die Ankopplung der Streifenleitungsresonatoren üblicherweise kapazitiv, indem auf der Grundfläche des Keramiksubstrats eine Fläche von der umgebenen Masse galvanisch getrennt wird, so daß diese Fläche zu einer durch das Dielektrikum getrennten oben auf dem Keramiksubstrat angeordneten Leiterbahn eine Kapazität bildet. Diese Kapazität ist nach der Plattenkondensatorformel abhängig vom ε des Dielektrikums, der Dicke des Substrates und der Größe der Fläche. Geringe Schwankungen der Lage der Fläche können, wenn diese Ankopplungskapazität z. B. zur Injizierung einer Mikrowellenleistung in einem Leistungsresonator benötigt wird, die Frequenz des durch die Ankopplung verstimmten Resonators verändern. In known strip power filters, the coupling takes place the stripline resonators are usually capacitive by on the base of the ceramic substrate an area of the surrounding mass is electrically isolated, so that this Area to a separated by the dielectric on top a capacitance arranged on the ceramic substrate forms. This capacitance is according to the plate capacitor formula depending on the ε of the dielectric, the thickness of the substrate and the size of the area. Slight fluctuations in the location of the Area can, if this coupling capacity z. B. for Injecting microwave power into a power resonator is needed, the frequency of the coupling change detuned resonator.
Zur Behebung dieser Schwierigkeiten waren bisher aufwendige Strukturierungsverfahren, Photolithograpie/Ätztechniken und hoch genaue Schlifftechniken bei der Substratherstellung erforderlich.Up to now, elaborate on these difficulties Structuring processes, photolithography / etching techniques and Highly precise grinding techniques required when manufacturing substrates.
Aufgabe der vorliegenden Erfindung ist es daher, einen nahezu abgleichfreien Resonator für ein Streifenleitungsfilter kostengünstig herzustellen, der auch bei Verkoppelung mit anderen Resonatoren zur Herstellung entsprechender Filter geringe Resonanzfrequenztoleranzen aufweist und sich durch engtolerierte Ankopplungskapazitäten auszeichnet.The object of the present invention is therefore almost a resonance-free resonator for a stripline filter inexpensive to manufacture, even when coupled with others Low resonators for the production of appropriate filters Has resonance frequency tolerances and is narrow tolerance Coupling capacities.
Diese Aufgabe wird erfindungsgemäß mit einem Streifenleitungsfilter gelöst, das die im Patentanspruch 1 angegebenen Merkmale aufweist. This object is achieved according to the invention with a strip line filter solved that specified in claim 1 Features.
Zweckmäßige Ausgestaltungen dieses Streifenleitungsfilters sind Gegenstand von Unteransprüchen.Appropriate configurations of this stripline filter are the subject of subclaims.
Die Erfindung wird im folgenden anhand von Ausführungsbeispielen naher erläutert.The invention is described below using exemplary embodiments explained in more detail.
In der dazu gehörenden Zeichnungen zeigen
- Figur 1
- die Ansicht eines Streifenleitungsfilters,
- Figur 2
- eine Seitenansicht des Streifenleitungsfilters nach Figur 1 und
Figur 3- eine weitere Ausführungsform eines Streifenleitungsfilters in Draufsicht.
- Figure 1
- the view of a stripline filter,
- Figure 2
- a side view of the stripline filter of Figure 1 and
- Figure 3
- a further embodiment of a stripline filter in plan view.
In der Figur 1 ist ein Keramiksubstrat 1 dargestellt, auf dem
zwei Streifenleitungsresonatoren 2 angeordnet sind. Ankopplungsmetallflachen
3 sind durch eine galvanische Trennung 4
von der allseitigen Massemetallisierung getrennt. Auf der
Oberfläche des Keramiksubstrats 1, auf der sich die Streifenleitungsresonatoren
2 befinden, sind Metallflachen 5 angeordnet,
die unter Zuhilfenahme von, vorzugsweise innen metallisierten,
Durchgangslöchern 6 mit den Ankopplungsmetallflachen
3 kontaktiert sind. Die Ankopplung des Streifenleitungsfilters
erfolgt somit dadurch, daß die durch die Trennflächen 4
galvanisch von der umgebenden Masse getrennten Ankopplungsmetallflachen
3 zur anderen Seite des Keramiksubstrats 1 durchkontaktiert
sind und die kapazitive Kopplung mit den Streifenleitungsresonatoren
2 auf der gegenüberliegenden Seite erfolgt.
Auch wenn das Bauelement durch diese Maßnahme geringfügig
größer wird, wird die Kopplung hauptsächlich durch den
Abstand der Strukturen bestimmt und nicht durch die Substratdicke,
die vorzugsweise aus hochdielektrischer Mikrowellenkeramik
besteht. Durch die Durchkontaktierung mit Hilfe der
Durchgangslöcher 6 kann die Haftfestigkeit der Ankopplungsstruktur
deutlich verbessert werden. Die Struktur auf der
Grundfläche kann mechanisch oder atztechnisch mit deutlich
größeren Toleranzen und somit ggf. geringerem Aufwand hergestellt
werden. Die Kopplung kann ebenfalls atztechnisch erstellt
werden, wobei die Lage der Fotomaske für die Koppelkapazität
unkritischer ist.In the figure 1, a ceramic substrate 1 is shown on the
two stripline resonators 2 are arranged.
Die Leitungsstrukturen können entweder in Dickschichttechnik (Siebdruck mit Dickschichtsilber) oder in Dünnschichttechnik (Kupfer geätzt) hergestellt werden.The line structures can either be in thick-film technology (Screen printing with thick-film silver) or in thin-film technology (Copper etched).
Eine andere Möglichkeit besteht darin, vor der Sinterung die Struktur in den Keramikkörper einzupressen. Bei Entfernung der Metallisierung an der Oberseite wird die Resonanzfrequenz nicht oder kaum beeinflußt.Another possibility is to pre-sinter the Press structure into the ceramic body. At distance The metallization on the top becomes the resonance frequency not or hardly influenced.
Der Abstand b zwischen den Streifenleitungsresonatoren 2 und den Metallflachen 5 der Ankopplungsstruktur bestimmt die Größe der Ankoppelkapazitat. Die kapazitive Kopplung bewerkstelligt die Transformation des niederohmigen Streifenleitungsresonators (typischerweise 5 bis 10 Ω) auf die in den meisten Anwendungen benötigte Anpassung auf 50 oder 75 Ω.The distance b between the stripline resonators 2 and determines the metal surfaces 5 of the coupling structure Size of the coupling capacity. Capacitive coupling accomplished the transformation of the low-resistance stripline resonator (typically 5 to 10 Ω) to those in the Most applications require adjustment to 50 or 75 Ω.
Der Abstand a zwischen den Metallflachen 5 der Ankopplungsstruktur bestimmt die Größe der externen Verkopplung. Über die Einstellung der Kapazität läßt sich die Lage der beiden Notches der Filtercharakteristik anwendungsgerecht einstellen.The distance a between the metal surfaces 5 of the coupling structure determines the size of the external coupling. over the setting of the capacity can be the location of the two Adjust notches of the filter characteristics to suit the application.
Das derart entstandene Filter zeichnet sich durch niedrige Einfügungsdämpfung, hohe Sperrselektion und durch hohe oder vollständige Abgleichfreiheit aus. Es ist zudem deutlich flacher als ein in seinen Eigenschaften vergleichbares aus gekoppelten Koaxialresonatoren bestehendes Mikrowellenkeramikfilter.The filter created in this way is characterized by low Insertion loss, high blocking selection and by high or complete freedom from comparison. It is also much flatter as a comparable one in its properties Coaxial resonators existing microwave ceramic filter.
In der Figur 2 ist das Streifenleitungsfilter nach Figur 1 in Seitenansicht dargestellt. The stripline filter according to FIG. 1 is shown in FIG Side view shown.
Eine Weiterbildung des beschriebenen Zweipolfilters kann darin bestehen, durch Hinzufügen weiterer Streifenleitungsresonatoren die Selektionseigenschaften des Filters zu erhöhen.A further development of the two-pole filter described can consist of adding more stripline resonators increase the selection properties of the filter.
Es besteht ferner auch die Möglichkeit, flache Einzelresonatoren mit nur einem Streifenleitungsresonator herzustellen, die beispielsweise als frequenzbestimmende Komponente eines Oszillators (Bandpaßbeschaltung) oder als Bandsperre geschaltet als Notchfilter zur zusätzlichen Filterung von Störfrequenzen dienen können. Hierbei können die Leiterbahnen sehr schmal ausgeführt und somit höhere charakteristische Impedanzen hergestellt werden. Ein Oszillator läßt sich dann besser ziehen (höhere Güte).There is also the possibility of flat individual resonators with only one stripline resonator, which, for example, as a frequency-determining component of a Oscillators (bandpass circuit) or switched as a bandstop as a notch filter for additional filtering of interference frequencies can serve. Here, the conductor tracks can be very slim design and therefore higher characteristic impedances getting produced. An oscillator can then be better draw (higher goodness).
Ferner ist es möglich, das Filter durch einen über der Oberseite angeordneten Bügel oder ein Gehäuse zu schirmen, die beispielsweise mit dem Keramiksubstrat 1 verlötet bzw. verklebt sind. Hierbei kann bei besonders hohen Anforderungen an die Frequenzgenauigkeit das Filter durch Gehäuseschlitze oder in die Schlitze eingefügte Abstimmlaschen nachjustiert werden.It is also possible to pass the filter through one over the top arranged brackets or a housing to shield the for example, soldered or glued to the ceramic substrate 1 are. This can apply to particularly high requirements the frequency accuracy of the filter through housing slots or adjustment tabs inserted into the slots can be readjusted.
Zur weiteren Miniaturisierung besteht zusätzlich die Möglichkeit, anstelle eines Abschirmbleches ein bis auf die dem Filter zugewandte Fläche metallisiertes Substrat auf das Grundsubstrat 1 zu montieren (Fügen durch Löten oder Kleben möglich).For further miniaturization, there is also the possibility instead of a shielding plate except for the filter facing surface of metallized substrate on the base substrate 1 to be assembled (joining possible by soldering or gluing).
Bei verschiedenen Anwendungen im Bereich schnurloser Telefone
und Mobilfunk ist eine besonders hohe einseitige Versteilerung
der Filtercharakteristik gewünscht, um Spiegelfrequenzen
- oder bei Duplexerbetrieb das Nachbarband - gezielt zu
unterdrücken. Hierfür ist in der Figur 3 ein Ausführungsbeispiel
dargestellt, das einen zusätzlichen Koppelkondensator 9
aufweist, der die Ankopplungsstrukturen zusätzlich kapazitiv
verkoppelt. Hierbei können Durchkontaktierungen (Löcher 12
oder Schlitze 13) zusätzlich zur Einstellung der Kopplung
zwischen den Einzelresonatoren 2 verwendet werden. Beim Ausführungsbeispiel
der Figur 3 ist im Bereich der Ankopplungsstruktur
die offene Seite (metallisierungsfrei) 11 und gegenüberliegend
die Kurzschlußseite 10.For various applications in the field of cordless telephones
and mobile radio is a particularly high one-sided steepening
the filter characteristics desired to mirror frequencies
- or the neighboring band in duplex mode - selectively
suppress. An exemplary embodiment is shown in FIG
shown that an additional coupling capacitor 9th
has the coupling structures additionally capacitive
coupled. Through-contacts (
Eine weitere Möglichkeit zur einseitigen Verbesserung der
Flankensteilheit besteht darin, eine Leitungsdiskontinuität
in Form eines Breitseitensprunges in der Resonatorleitung 2
zu erzeugen. Dies geschieht dadurch, daß entweder der Streifenleitungsresonator
2 im Bereich der Kurzschlußseite 10 einen
verminderten Querschnitt aufweist (metallfreie Fläche 8)
oder in diesem Bereich verbreitert ist (zusätzliche Metallisierung
7). Im ersten Fall resultiert eine induktive und im
zweiten eine kapazitive Wirkung.Another way to unilaterally improve
Edge steepness is a line discontinuity
in the form of a broadside jump in the resonator line 2
to create. This happens because either the stripline resonator
2 in the area of the short-
Derartige Filter mit einem Breitseitensprung in den Streifenleitungsresonatoren
2 zeichnen sich dadurch aus, daß die Filtercharakteristik
eine Versteilerung zu niedrigeren Frequenzen
aufweist. Werden die Breitseitensprünge zur offenen Seite
11 hingespiegelt, kann eine Versteilerung zu höheren Frequenzen
realisiert werden. Die Breitseitensprünge mit kapazitiver
Wirkung (Vergrößerung der Abmessungen um die Fläche 7) zeichnen
sich besonders dadurch zusätzlich aus, daß die Kopplung
sehr gut reproduzierbar ist, da der Leitungssprung nach außen
geführt ist.Such filters with a broad side jump in the stripline resonators
2 are characterized in that the filter characteristic
a steepening to lower frequencies
having. The broadside jumps become the
Der Breitseitensprung kann gegebenenfalls auch so ausgeführt sein, daß ein Stück des Innenleiters gegen das andere verschoben ist. Hiermit läßt sich die Notchlage zusätzlich einstellen. Da es sich hierbei um eine Hinterschneidung handelt, kann man diesen Körper nur in der vorher beschriebenen Form herstellen, d.h. er ist nicht in einem Stück (monolithisch) zu pressen.The broadside jump can optionally also be carried out in this way be that one piece of the inner conductor is shifted against the other is. With this, the emergency strike can be added to adjust. Because this is an undercut acts, you can only this body in the previously described Make mold, i.e. it is not in one piece to press (monolithic).
Falls zusätzlich ein Keramikdeckel montiert werden soll, besteht auch die Mögichkeit, den Deckel im gepreßten Zustand mit dem ebenfalls grünen Grundsubstrat zu fügen und anschließend zu sintern. Man erspart sich dadurch den im anderen Fall notwendigen Arbeitsschritt, die funktional notwendigen metallisierungsfreien Flächen zu entmetallisieren bzw. metallisierungsfrei zu halten.If a ceramic lid is also to be installed, there is also the possibility of the lid in the pressed state with the green base substrate and then add to sinter. This saves you the other way necessary work step, the functionally necessary metallization-free Demetallize surfaces or metallization-free to keep.
Zur Minimierung der Einfügungsdämpfung und somit zur Reduktion der Verluste kann das Streifenleitungsfilter insofern unsymmetrisch aufgebaut werden, daß das Kermiksubstrat 1 dikker als der Keramikdeckel ist. Die unbelastete Güte der Resonatoren läßt sich auf diese Weise um bis zu 50 % steigern.To minimize insertion loss and thus to reduce it the stripline filter can insofar the losses be constructed asymmetrically that the ceramic substrate 1 thicker than the ceramic lid is. The unstressed quality of the resonators can be increased by up to 50% in this way.
Claims (9)
- Stripline filter having at least two stripline resonators (2) arranged on a surface side of a ceramic substrate (1), having capacitive coupling structures (3 to 6) for the coupling of an RF signal, having an earth metallization layer on the ceramic substrate (1) on all sides with the exception of the end side of the substrate (1) with the coupling structures (3 to 6) and the surface side with the stripline resonators (2), the capacitive coupling structures (3 to 6) being formed by virtue of the fact that coupling metal areas (3) isolated from the earth metallization layer by DC-isolation (4) are provided on that surface side of the substrate (1) which is opposite to the stripline resonators (2) and DC-isolated metal areas (5) are provided on that surface side of the substrate (1) which carries the stripline resonators, and having an electrically conductive connection between the coupling metal areas (3) and the metal areas (5),
characterized
in that the electrically conductive connection between the coupling metal areas (3) and the metal areas (5) is formed by through holes (6) in the substrate (1), and in that the coupling structures (3 to 6) are capacitively coupled by a coupling capacitor (9). - Stripline filter according to Claim 1,
characterized
in that the coupling capacitance between the coupling structures (3 to 6) and the stripline resonators (2) is defined by a distance (b) between coupling structures (3 to 6) and stripline resonators (2). - Stripline filter according to Claim 1 or 2,
characterized
in that the size of the external coupling is defined by a distance (a) between the metal areas (5). - Stripline filter according to one of Claims 1 to 3,
characterized
in that the selection properties of the filter are increased by further stripline resonators (2) that are added. - Stripline filter according to one of Claims 1 to 4,
characterized
in that the metallization structures are produced by means of thick-film technology (for example screen printing with thick-film silver) or by means of thin-film technology (copper, etched). - Stripline filter according to one of Claims 1 to 4,
characterized
in that the metallization structures are pressed into the ceramic substrate (1) prior to the sintering process. - Stripline filter according to one of Claims 1 to 6,
characterized
in that a line discontinuity in the form of a broadside discontinuity (7, 8) is arranged in the stripline resonators (2). - Stripline filter according to one of Claims 1 to 7,
characterized
in that a ceramic cover is arranged over the ceramic substrate (1). - Stripline filter according to Claim 8,
characterized
in that the ceramic substrate (1) is thicker than the ceramic cover.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4446103 | 1994-12-22 | ||
| DE4446103 | 1994-12-22 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0718906A1 EP0718906A1 (en) | 1996-06-26 |
| EP0718906B1 true EP0718906B1 (en) | 1999-05-12 |
Family
ID=6536790
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP95118894A Expired - Lifetime EP0718906B1 (en) | 1994-12-22 | 1995-11-30 | Stripline filter |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US5812037A (en) |
| EP (1) | EP0718906B1 (en) |
| AT (1) | ATE180107T1 (en) |
| DE (1) | DE59505908D1 (en) |
| DK (1) | DK0718906T3 (en) |
| ES (1) | ES2134398T3 (en) |
| GR (1) | GR3030890T3 (en) |
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| WO1997050144A1 (en) * | 1996-06-27 | 1997-12-31 | E.I. Du Pont De Nemours And Company | Planar high temperature superconductor filters or multiplexers with backside coupling |
| DE19652799C2 (en) * | 1996-12-18 | 1999-05-20 | Siemens Ag | Microwave filter |
| DE19742971C2 (en) * | 1997-09-29 | 1999-12-09 | Siemens Matsushita Components | Stripline filter |
| US6147576A (en) * | 1998-04-10 | 2000-11-14 | Ameramp Llc | Filter designs utilizing parasitic and field effects |
| JP2000252716A (en) * | 1999-03-03 | 2000-09-14 | Sony Corp | Distributed constant filter, its manufacture and distributed constant filter printed circuit board |
| US20040085165A1 (en) * | 2002-11-05 | 2004-05-06 | Yung-Rung Chung | Band-trap filter |
| DE10311041A1 (en) * | 2003-03-13 | 2004-10-07 | Kathrein-Werke Kg | High-frequency connection or high-frequency distribution network |
| US7411474B2 (en) * | 2005-10-11 | 2008-08-12 | Andrew Corporation | Printed wiring board assembly with self-compensating ground via and current diverting cutout |
| US7724109B2 (en) * | 2005-11-17 | 2010-05-25 | Cts Corporation | Ball grid array filter |
| US7940148B2 (en) * | 2006-11-02 | 2011-05-10 | Cts Corporation | Ball grid array resonator |
| WO2008063507A2 (en) * | 2006-11-17 | 2008-05-29 | Cts Corporation | Voltage controlled oscillator module with ball grid array resonator |
| US20090236134A1 (en) * | 2008-03-20 | 2009-09-24 | Knecht Thomas A | Low frequency ball grid array resonator |
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| US4266206A (en) * | 1978-08-31 | 1981-05-05 | Motorola, Inc. | Stripline filter device |
| JPS623040A (en) * | 1985-06-25 | 1987-01-09 | Nippon Electric Glass Co Ltd | Glass for coating of semiconductor |
| JPH0334305U (en) * | 1989-08-14 | 1991-04-04 | ||
| KR0174531B1 (en) * | 1989-11-20 | 1999-04-01 | 이우에 사또시 | Band-passfilter using microstrip lines and filter characteristic adjusting method thereof |
| DE4031536A1 (en) * | 1990-10-05 | 1992-04-16 | Rohde & Schwarz | MICROWAVE CONTROL |
| US5105175A (en) * | 1991-03-12 | 1992-04-14 | Motorola, Inc. | Resonant circuit element having insignificant microphonic effects |
| JP2502824B2 (en) * | 1991-03-13 | 1996-05-29 | 松下電器産業株式会社 | Flat type dielectric filter |
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-
1995
- 1995-11-30 DE DE59505908T patent/DE59505908D1/en not_active Expired - Lifetime
- 1995-11-30 DK DK95118894T patent/DK0718906T3/en active
- 1995-11-30 EP EP95118894A patent/EP0718906B1/en not_active Expired - Lifetime
- 1995-11-30 ES ES95118894T patent/ES2134398T3/en not_active Expired - Lifetime
- 1995-11-30 AT AT95118894T patent/ATE180107T1/en active
- 1995-12-18 US US08/573,728 patent/US5812037A/en not_active Expired - Lifetime
-
1999
- 1999-07-30 GR GR990401971T patent/GR3030890T3/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| ES2134398T3 (en) | 1999-10-01 |
| ATE180107T1 (en) | 1999-05-15 |
| GR3030890T3 (en) | 1999-11-30 |
| EP0718906A1 (en) | 1996-06-26 |
| DK0718906T3 (en) | 1999-11-01 |
| DE59505908D1 (en) | 1999-06-17 |
| US5812037A (en) | 1998-09-22 |
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