EP0910876B1 - Monolithic filter - Google Patents
Monolithic filter Download PDFInfo
- Publication number
- EP0910876B1 EP0910876B1 EP97931679A EP97931679A EP0910876B1 EP 0910876 B1 EP0910876 B1 EP 0910876B1 EP 97931679 A EP97931679 A EP 97931679A EP 97931679 A EP97931679 A EP 97931679A EP 0910876 B1 EP0910876 B1 EP 0910876B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- metallization
- filter
- ceramic body
- ground connection
- monolithic filter
- 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
-
- 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
- H01P1/205—Comb or interdigital filters; Cascaded coaxial cavities
- H01P1/2056—Comb filters or interdigital filters with metallised resonator holes in a dielectric block
Definitions
- the invention relates to a monolithic filter, in particular Microwave filter, which consists of a ceramic body, in the holes are arranged from one side to the opposite side, where the surface of the Ceramic body with the exception of one side a metallization possesses, the connection surfaces insulated from the metallization for capacitive coupling / decoupling of RF signals, and in which a ground connection is arranged between the connection surfaces is.
- a monolithic filter in particular Microwave filter, which consists of a ceramic body, in the holes are arranged from one side to the opposite side, where the surface of the Ceramic body with the exception of one side a metallization possesses, the connection surfaces insulated from the metallization for capacitive coupling / decoupling of RF signals, and in which a ground connection is arranged between the connection surfaces is.
- Such a filter is known from US 5,162,760.
- ground connection located between the pads is used to reduce or avoid crosstalk.
- this ground connection is with the outer metallization galvanically connected.
- the object of the present invention is to provide a filter Specify the type mentioned, in which these difficulties cannot occur during soldering.
- This configuration has the advantage that the Quantity of solder of the ground connection arranged between the HF connections can't run away.
- the object of the invention is based on an embodiment explained in more detail.
- a microwave ceramic filter 1 shown which consists of a ceramic body 2 exists, arranged in the through holes 3, 4 are from one side 5 to the opposite side 6 to lead.
- All outer surfaces of the ceramic body 2 with the exception of the surface 6 are provided with a metallization 7.
- the inside the holes 3, 4 is also with a metallization provided so that coaxial resonators are formed.
- insulated pads 8, 9 On the surface shown in the figure as the top are over the through holes 3, 4 from the rest of the metallization 7 insulated pads 8, 9 arranged for capacitive Serve in or out of RF signals. Between the connection surfaces 8, 9 there is a ground connection 10, that according to the invention also from the rest of the metallization 7 is separated.
- connection surfaces 8, 9, 10 are produced by that this from the originally continuous metallization 7 etching or mechanical by grinding the surrounding metallization. Because the insulation of the ground connection 10 simultaneously with the manufacture the HF pads 8, 9 takes place, there is no additional effort.
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
Description
Die Erfindung betrifft ein monolithisches Filter, insbesondere Mikrowellenfilter, das aus einem Keramikkörper besteht, in dem Durchbohrungen angeordnet sind, die von einer Seite zur gegenüberliegenden Seite führen, bei dem die Oberfläche des Keramikkörpers mit Ausnahme einer Seite eine Metallisierung besitzt, der von der Metallisierung isolierte Anschlußflächen zum kapazitiven Ein-/Auskoppeln von HF-Signalen aufweist, und bei dem zwischen den Anschlußflächen ein Masseanschluß angeordnet ist.The invention relates to a monolithic filter, in particular Microwave filter, which consists of a ceramic body, in the holes are arranged from one side to the opposite side, where the surface of the Ceramic body with the exception of one side a metallization possesses, the connection surfaces insulated from the metallization for capacitive coupling / decoupling of RF signals, and in which a ground connection is arranged between the connection surfaces is.
Ein derartiges Filter ist aus der US 5,162,760 bekannt.Such a filter is known from US 5,162,760.
Der zwischen den Anschlußflächen angeordnete Masseanschluß dient dazu, ein Übersprechen zu reduzieren oder zu vermeiden. Bei dem bekannten Filter ist dieser Masseanschluß mit der Außenmetallisierung galvanisch verbunden. Es besteht nun die Gefahr, daß bei einer Lötung Lötmetall über das Bauelement verrinnt, was sich bestenfalls nur mit Hilfe von aufwendig aufzubringendem Lötstopplack vermeiden ließe.The ground connection located between the pads is used to reduce or avoid crosstalk. In the known filter, this ground connection is with the outer metallization galvanically connected. There is now the Risk of solder over the component during soldering trickles away, which can only be done with the help of complex prevent solder mask to be applied.
Aufgabe der vorliegenden Erfindung ist es, ein Filter der eingangs genannten Art anzugeben, bei dem diese Schwierigkeiten beim Löten nicht auftreten können.The object of the present invention is to provide a filter Specify the type mentioned, in which these difficulties cannot occur during soldering.
Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß der Masseanschluß von der Metallisierung getrennt ist.This object is achieved in that the Ground connection is separated from the metallization.
Durch diese Ausgestaltung wird der Vorteil erzielt, daß die Lotmenge des zwischen den HF-Anschlüssen angeordneten Masseanschlusses nicht verrinnen kann.This configuration has the advantage that the Quantity of solder of the ground connection arranged between the HF connections can't run away.
Der Gegenstand der Erfindung wird anhand eines Ausführungsbeispieles näher erläutert. The object of the invention is based on an embodiment explained in more detail.
In der dazugehörenden Zeichnung mit einer einzigen Figur ist
ein Mikrowellenkeramikfilter 1 dargestellt, das aus einem Keramikkörper
2 besteht, in dem Durchbohrungen 3, 4 angeordnet
sind, die von einer Seite 5 zur gegenüberliegenden Seite 6
führen.In the accompanying drawing with a single figure
a microwave ceramic filter 1 shown, which consists of a
Alle Außenflächen des Keramikkörpers 2 mit Ausnahme der Fläche
6 sind mit einer Metallisierung 7 versehen. Die Innenseite
der Durchbohrungen 3, 4 ist ebenfalls mit einer Metallisierung
versehen, so daß koaxiale Resonatoren gebildet werden.All outer surfaces of the
Auf der in der Figur als Oberseite dargestellten Fläche sind
über den Durchbohrungen 3, 4 von der übrigen Metallisierung 7
isolierte Anschlußflächen 8, 9 angeordnet, die zur kapazitiven
Ein- bzw. Auskoppelung von HF-Signales dienen. Zwischen
den Anschlußflächen 8, 9 befindet sich ein Masseanschluß 10,
der gemäß der Erfindung ebenfalls von der übrigen Metallisierung
7 getrennt ist.On the surface shown in the figure as the top are
over the through holes 3, 4 from the rest of the
Die Herstellung der Anschlußflächen 8, 9, 10 geschieht dadurch,
daß diese von der ursprünglich durchgehenden Metallisierung
7 ätztechnisch bzw. mechanisch durch Schleifen von
der Umgebungsmetallisierung getrennt werden. Da die Isolierung
des Masseanschlusses 10 gleichzeitig mit der Herstellung
der HF-Anschlußflächen 8, 9 erfolgt, entsteht kein Mehraufwand.The
Claims (1)
- Monolithic filter (1), in particular a microwave filter, which comprises a ceramic body (2) in which apertures (3, 4) are arranged which lead from one side (5) to the opposite side (6), in which, except on one side (6), the surface of the ceramic body (2) has metallization (7) and has connecting surfaces (8, 9), which are insulated from the metallization (7), for capacitive inputting/outputting of RF signals, and in which an earth connection (10) is arranged between the connecting surfaces (8, 9)
characterized
in that the earth connection (10) is isolated from the metallization (7).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19628023 | 1996-07-11 | ||
| DE19628023A DE19628023C1 (en) | 1996-07-11 | 1996-07-11 | Monolithic filter |
| PCT/DE1997/001359 WO1998002934A1 (en) | 1996-07-11 | 1997-06-27 | Monolithic filter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0910876A1 EP0910876A1 (en) | 1999-04-28 |
| EP0910876B1 true EP0910876B1 (en) | 1999-12-22 |
Family
ID=7799587
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP97931679A Expired - Lifetime EP0910876B1 (en) | 1996-07-11 | 1997-06-27 | Monolithic filter |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0910876B1 (en) |
| JP (1) | JP2000514622A (en) |
| CA (1) | CA2260212A1 (en) |
| DE (2) | DE19628023C1 (en) |
| WO (1) | WO1998002934A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5906978A (en) | 1996-08-14 | 1999-05-25 | Hemocleanse, Inc. | Method for iron delivery to a patient by transfer from dialysate |
| DE19855872B4 (en) * | 1998-12-03 | 2004-04-15 | Epcos Ag | Microwave ceramic filters |
| DE19903855B4 (en) * | 1999-02-01 | 2010-04-15 | Epcos Ag | antenna Combiner |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5162760A (en) * | 1991-12-19 | 1992-11-10 | Motorola, Inc. | Dielectric block filter with isolated input/output contacts |
| US5379011A (en) * | 1992-10-23 | 1995-01-03 | Motorola, Inc. | Surface mount ceramic filter duplexer having reduced input/output coupling and adjustable high-side transmission zeroes |
| US5721520A (en) * | 1995-08-14 | 1998-02-24 | Motorola, Inc. | Ceramic filter with ground plane features which provide transmission zero and coupling adjustment |
-
1996
- 1996-07-11 DE DE19628023A patent/DE19628023C1/en not_active Expired - Fee Related
-
1997
- 1997-06-27 JP JP10505498A patent/JP2000514622A/en active Pending
- 1997-06-27 EP EP97931679A patent/EP0910876B1/en not_active Expired - Lifetime
- 1997-06-27 DE DE59700909T patent/DE59700909D1/en not_active Expired - Lifetime
- 1997-06-27 CA CA002260212A patent/CA2260212A1/en not_active Abandoned
- 1997-06-27 WO PCT/DE1997/001359 patent/WO1998002934A1/en active IP Right Grant
Also Published As
| Publication number | Publication date |
|---|---|
| EP0910876A1 (en) | 1999-04-28 |
| DE59700909D1 (en) | 2000-01-27 |
| WO1998002934A1 (en) | 1998-01-22 |
| DE19628023C1 (en) | 1997-06-12 |
| JP2000514622A (en) | 2000-10-31 |
| CA2260212A1 (en) | 1998-01-22 |
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