EP0718906B1 - Streifenleitungsfilter - Google Patents

Streifenleitungsfilter Download PDF

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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
Application number
EP95118894A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0718906A1 (de
Inventor
Christian Block
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TDK Electronics AG
Original Assignee
Siemens Matsushita Components GmbH and Co KG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Siemens Matsushita Components GmbH and Co KG filed Critical Siemens Matsushita Components GmbH and Co KG
Publication of EP0718906A1 publication Critical patent/EP0718906A1/de
Application granted granted Critical
Publication of EP0718906B1 publication Critical patent/EP0718906B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H01P1/203—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.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)
  • Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
  • Polarising Elements (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
EP95118894A 1994-12-22 1995-11-30 Streifenleitungsfilter Expired - Lifetime EP0718906B1 (de)

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 (de) 1996-06-26
EP0718906B1 true EP0718906B1 (de) 1999-05-12

Family

ID=6536790

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95118894A Expired - Lifetime EP0718906B1 (de) 1994-12-22 1995-11-30 Streifenleitungsfilter

Country Status (7)

Country Link
US (1) US5812037A (es)
EP (1) EP0718906B1 (es)
AT (1) ATE180107T1 (es)
DE (1) DE59505908D1 (es)
DK (1) DK0718906T3 (es)
ES (1) ES2134398T3 (es)
GR (1) GR3030890T3 (es)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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 (de) * 1996-12-18 1999-05-20 Siemens Ag Mikrowellenfilter
DE19742971C2 (de) * 1997-09-29 1999-12-09 Siemens Matsushita Components Streifenleitungsfilter
US6147576A (en) * 1998-04-10 2000-11-14 Ameramp Llc Filter designs utilizing parasitic and field effects
JP2000252716A (ja) * 1999-03-03 2000-09-14 Sony Corp 分布定数フィルタおよびその製造方法、ならびに分布定数フィルタ回路基板
US20040085165A1 (en) * 2002-11-05 2004-05-06 Yung-Rung Chung Band-trap filter
DE10311041A1 (de) * 2003-03-13 2004-10-07 Kathrein-Werke Kg Hochfrequenz-Verbindung bzw. Hochfrequenz-Verteilnetzwerk
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

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4266206A (en) * 1978-08-31 1981-05-05 Motorola, Inc. Stripline filter device
JPS623040A (ja) * 1985-06-25 1987-01-09 Nippon Electric Glass Co Ltd 半導体被覆用ガラス
JPH0334305U (es) * 1989-08-14 1991-04-04
US5105173A (en) * 1989-11-20 1992-04-14 Sanyo Electric Co., Ltd. Band-pass filter using microstrip lines
DE4031536A1 (de) * 1990-10-05 1992-04-16 Rohde & Schwarz Mikrowellenschaltung
US5105175A (en) * 1991-03-12 1992-04-14 Motorola, Inc. Resonant circuit element having insignificant microphonic effects
JP2502824B2 (ja) * 1991-03-13 1996-05-29 松下電器産業株式会社 平面型誘電体フィルタ
JPH0529817A (ja) * 1991-07-18 1993-02-05 Matsushita Electric Ind Co Ltd λ／４形誘電体共振器
JPH0563405A (ja) * 1991-09-03 1993-03-12 Tdk Corp 誘電体基板トリプレート・ストリツプ線路

Also Published As

Publication number Publication date
DK0718906T3 (da) 1999-11-01
DE59505908D1 (de) 1999-06-17
ATE180107T1 (de) 1999-05-15
US5812037A (en) 1998-09-22
GR3030890T3 (en) 1999-11-30
EP0718906A1 (de) 1996-06-26
ES2134398T3 (es) 1999-10-01

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