EP1074058B1 - Mikrowellen-keramikfilter mit verbesserter flankensteilheit - Google Patents
Mikrowellen-keramikfilter mit verbesserter flankensteilheit Download PDFInfo
- Publication number
- EP1074058B1 EP1074058B1 EP99910137A EP99910137A EP1074058B1 EP 1074058 B1 EP1074058 B1 EP 1074058B1 EP 99910137 A EP99910137 A EP 99910137A EP 99910137 A EP99910137 A EP 99910137A EP 1074058 B1 EP1074058 B1 EP 1074058B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- counter
- resonators
- ceramic
- oscillator
- ceramic body
- 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 present invention relates to a microwave ceramic filter with improved slope, the least two resonators in a one-piece ceramic body and coupling structures assigned to the resonators for capacitive Coupling the ceramic filter to an external high-frequency circuit having.
- Such a microwave ceramic filter with resonator holes and interposed coupling holes is from the Document EP 0809315 A1 known.
- the coupling holes serve for a better coupling of the resonators.
- With the coupling holes are particularly successful, the magnetic Share of the coupling field of the side by side Increase resonators.
- a microwave ceramic filter which consists of a ceramic body in which two parallel inner conductor holes with round Cross section are designed as resonators.
- the ceramic body itself consists of two pressed and sintered together Presslings, so that he can be regarded as one piece is, although the two compacts have different dielectrics form.
- the ceramic body still has coupling structures on by galvanic isolation of the otherwise metallization applied to the entire surface of the ceramic body are formed. This separation can be mechanical, etching or photoresist.
- microwave ceramic filters are preferred as cellular filters used in mobile phones ("Handy").
- each the ceramic body is made of high-dielectric ceramic, the lower the insertion loss because the quality of the in the ceramic body coupled line resonators proportional to the volume of the ceramic body.
- the microwave ceramic filter designed as small as possible for mobile radio purposes should be the size of a cellular phone as well to be as low as possible. It should be noted is that the selection can only be made by increasing the number of poles or through complex coupling of the resonators of the microwave ceramic filter with coils and capacitors to a bandstop can be achieved.
- the present invention is based on the object Microwave ceramic filter with improved slope to create that through a low insertion loss on the belt edge and thus by a correspondingly high slope distinguished.
- the central axis of the counteroscillator is essentially parallel to the resonator central axes.
- the central axes of the resonators lie in a sectional plane, which are arranged essentially centrally in the ceramic body is.
- the distance between the counteroscillator and the coupling structures is larger than the distance between the coupling structures and the resonators, where the counteroscillator is only weakly excitable.
- each resonator a counteroscillator is assigned.
- the resonators themselves can have a rectangular cross section because with such an unloaded quality and thus the insertion loss of the microwave ceramic filter further improve to let.
- the ceramic body is complete except for its raised face metallized, the coupling structures in the usual Way are separated from this metallization.
- the two resonators which, as explained, prefer one have rectangular cross-section, are over the coupling structures capacitively excited.
- the suggestion of the counter-vibrator is done weakly to cause insertion loss the frequency at which the characteristic of "Gegenennotch" trains, is highly selective. simultaneously is then the insertion loss at the band edge low, so that the slope is correspondingly high is.
- Fig. 1 shows a microwave ceramic filter according to a first Embodiment of the present invention.
- This microwave ceramic filter has a ceramic body 1, in which Resonators 2, 3 are provided for the improvement the unloaded quality and thus the insertion loss have a rectangular cross section and also gradations 4, which have the edges of the transmission characteristic of the microwave ceramic filter.
- the ceramic body 1 is perfect with the exception of its end face 5 metallized, which is also the case for the resonators 2, 3 Inner holes apply.
- Coupling structures 6, 7 and ground or mass ranges 8, 9 are of the otherwise with the exception of the raised end face 5 the ceramic body enveloping metallization separated what what already mentioned was pointed out by galvanic separation, for example mechanical, etching or photoresist can happen.
- a counteroscillator 10 is provided, one has circular cross section.
- the two resonators 2, 3 are due to the coupling structures 6, 7 capacitively excited.
- the counter-oscillator's suggestion 10 is only weak to cause that the insertion loss of the frequency at which there is a corresponding Counter-notch trains, as highly selective as possible is. At the same time, the insertion loss is then on the band edge low, so that the edge steepness accordingly is high.
- the course of the insertion loss D as a function of Frequency f is for the microwave ceramic filter of FIG. 1 and 2 schematically shown in Fig. 4.
- a curve 11 shows the characteristic of a microwave ceramic filter without counter-oscillator 10
- a curve 12 the characteristic of Microwave ceramic filter according to the invention with the counteroscillator 10 indicates. It can be clearly seen that at higher Frequencies a greater steepness of the characteristic and so that there is a better selection.
- the insertion loss is also overall at the belt edge less than one Microwave ceramic filter without counteroscillator 10.
- FIG. 3 shows a further embodiment of the invention
- Microwave ceramic filter here in addition to the counteroscillator 10 of the first embodiment of FIG Fig. 1 is also a second counter-oscillator 13 is provided.
- the slope can be reduced and further increase selection if the counter notch 14 and 15 (see FIG. 5) of the two resonators 2, 3 approximately is chosen the same, what by appropriate arrangement and Design of the counteroscillator 10, 13 is achieved.
- the counter-notch Select 16 or 17 so that both filter edges are distributed as shown in FIG. 6.
- Typical dimensions for the resonators 2, 3 are approximately side lengths of 1.2 mm, with a square cross section is assumed to be 8.16 mm for the length of the cuboid ceramic body 1, 4.5 mm for its depth and 4.76 mm for its Height.
- the gradations 4 can be at a depth of about 0.8 mm from the end face 5 can be arranged.
- the diameter the counteroscillator 10 and 13 with a circular cross section is about 0.9 mm.
- Ceramic body 1 itself be used. It is also possible to use the ceramic body 1 to be made in one piece from, for example, two parts.
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
- Filtering Materials (AREA)
- Inorganic Insulating Materials (AREA)
Description
- Fig. 1.
- eine perspektivische Darstellung eines Mikrowellen-Keramikfilters gemäß einem ersten Ausführungsbeispiel der vorliegenden Erfindung,
- Fig. 2
- einen Schnitt A-A durch das Mikrowellen-Keramikfilter von Fig. 1,
- Fig. 3
- eine perspektivische Darstellung eines Mikrowellen-Keramikfilters gemäß einem weiteren Ausführungsbeispiel der vorliegenden Erfindung,
- Fig. 4
- den frequenzabhängigen Dämpfungsverlauf bei einem Mikrowellen-Keramikfilter mit und ohne Gegenschwinger,
- Fig. 5
- den frequenzabhängigen Dämpfungsverlauf bei einem erfindungsgemäßen Mikrowellen-Keramikfilter, bei dem zwei Gegenschwinger verwendet werden, wobei der Gegennotch für beide Resonatoren etwa gleich gewählt ist, und
- Fig. 6
- den frequenzabhängigen Dämpfungsverlauf bei einem Mikrowellen-Keramikfilter gemäß der vorliegenden Erfindung, bei dem durch Verwendung von zwei Gegenschwinger beide Filterflanken versteilert sind.
Claims (8)
- Mikrowellen-Keramikfilter mit verbesserter Flankensteilheit, das mindestens zwei Resonatoren (2, 3) in einem einstückigen Keramikkörper (1) und den Resonatoren (2, 3) zugeordnete Ankopplungsstrukturen (6, 7) zum kapazitiven Ankoppeln des Keramikfilters an eine externe HF-Schaltung aufweist,
wobei die Mittelachsen der Resonatoren (2, 3) in einer Schnittebene liegen, die im Keramikkörper (1) im wesentlichen mittig angeordnet ist,
wobei im Keramikkörper (1) wenigstens ein Gegenschwinger (10, 13) angeordnet ist,
wobei die Mittelachse des Gegenschwingers im wesentlichen parallel zu den Resonator-Mittelachsen liegt,
wobei der Abstand zwischen dem Gegenschwinger und den Ankopplungsstrukturen (6, 7) größer als der Abstand zwischen den Ankopplungsstrukturen (6, 7) und den Resonatoren (2, 3) eingestellt ist,
wobei der Gegenschwinger nur schwach anregbar ist,
gekennzeichnet dadurch, daß
der Gegenschwinger (10, 13) zwischen der Schnittebene und der dazu parallelen Außenseite des Keramikkörpers (1) zur Außenseite des Keramikkörpers hin versetzt angeordnet ist. - Mikrowellen-Keramikfilter nach Anspruch 1,
dadurch gekennzeichnet, daß bei einem Keramikkörper (1) mit zwei Resonatoren (2, 3) zwei Gegenschwinger (10, 13) vorgesehen sind. - Mikrowellen-Keramikfilter nach Anspruch 1 oder 2,
dadurch gekennzeichnet, daß der Keramikkörper (1) bis auf seine Stirnseite (5) metallisiert ist. - Mikrowellen-Keramikfilter nach einem der Ansprüche 1 bis 3,
dadurch gekennzeichnet, daß die Resonatoren (2, 3) einen rechteckigen, insbesondere quadratischen Querschnitt haben. - Mikrowellen-Keramikfilter nach einem der Ansprüche 1 bis 4,
dadurch gekennzeichnet, daß die Gegenschwinger (10, 13) einen kreisförmigen Querschnitt haben. - Mikrowellen-Keramikfilter nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß der Gegenschwinger (10, 13) so angeordnet ist, daß der Gegennotch bei zwei Resonatoren (2, 3) etwa gleich gewählt ist oder beide Filterflanken versteilert sind.
- Mikrowellen-Keramikfilter nach einem der Ansprüche 1 bis 6,
bei dem der Gegenschwinger in einem Eck des Keramikkörpers angeordnet ist. - Mikrowellen-Keramikfilter nach einem der Ansprüche 1 bis 7,
bei dem der Durchmesser des Gegenschwingers kleiner als die Ausdehnung der Resonatoren quer zur Resonator-Mittelachse ist.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19811861 | 1998-03-18 | ||
DE19811861 | 1998-03-18 | ||
PCT/DE1999/000405 WO1999048166A1 (de) | 1998-03-18 | 1999-02-12 | Mikrowellen-keramikfilter mit verbesserter flankensteilheit |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1074058A1 EP1074058A1 (de) | 2001-02-07 |
EP1074058B1 true EP1074058B1 (de) | 2004-10-20 |
Family
ID=7861391
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP99910137A Expired - Lifetime EP1074058B1 (de) | 1998-03-18 | 1999-02-12 | Mikrowellen-keramikfilter mit verbesserter flankensteilheit |
Country Status (5)
Country | Link |
---|---|
US (1) | US6552633B1 (de) |
EP (1) | EP1074058B1 (de) |
AT (1) | ATE280441T1 (de) |
DE (2) | DE59910901D1 (de) |
WO (1) | WO1999048166A1 (de) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3528738B2 (ja) * | 1999-04-02 | 2004-05-24 | 株式会社村田製作所 | 誘電体フィルタ、誘電体デュプレクサ、および通信機 |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH03121705U (de) * | 1990-03-27 | 1991-12-12 | ||
US5327108A (en) * | 1991-03-12 | 1994-07-05 | Motorola, Inc. | Surface mountable interdigital block filter having zero(s) in transfer function |
CA2114029C (en) * | 1992-05-26 | 1997-11-18 | Darioush Agahi-Kesheh | Multi-passband dielectric filter construction |
JPH09312506A (ja) * | 1996-05-23 | 1997-12-02 | Ngk Spark Plug Co Ltd | 誘電体フィルタ |
JPH10145110A (ja) * | 1996-11-05 | 1998-05-29 | Murata Mfg Co Ltd | 複合誘電体フィルタ |
JP3577921B2 (ja) * | 1997-01-13 | 2004-10-20 | 株式会社村田製作所 | 誘電体フィルタ及び誘電体デュプレクサ |
US5808526A (en) * | 1997-03-05 | 1998-09-15 | Tx Rx Systems Inc. | Comb-line filter |
-
1999
- 1999-02-12 DE DE59910901T patent/DE59910901D1/de not_active Expired - Lifetime
- 1999-02-12 AT AT99910137T patent/ATE280441T1/de not_active IP Right Cessation
- 1999-02-12 EP EP99910137A patent/EP1074058B1/de not_active Expired - Lifetime
- 1999-02-12 WO PCT/DE1999/000405 patent/WO1999048166A1/de active IP Right Grant
- 1999-03-04 DE DE29903966U patent/DE29903966U1/de not_active Expired - Lifetime
-
2000
- 2000-09-18 US US09/664,000 patent/US6552633B1/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
EP1074058A1 (de) | 2001-02-07 |
WO1999048166A1 (de) | 1999-09-23 |
ATE280441T1 (de) | 2004-11-15 |
DE59910901D1 (de) | 2004-11-25 |
DE29903966U1 (de) | 1999-06-17 |
US6552633B1 (en) | 2003-04-22 |
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