EP0732762A1 - Filtre à structure plane - Google Patents

Filtre à structure plane Download PDF

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Publication number
EP0732762A1
EP0732762A1 EP95117629A EP95117629A EP0732762A1 EP 0732762 A1 EP0732762 A1 EP 0732762A1 EP 95117629 A EP95117629 A EP 95117629A EP 95117629 A EP95117629 A EP 95117629A EP 0732762 A1 EP0732762 A1 EP 0732762A1
Authority
EP
European Patent Office
Prior art keywords
coupling
strip conductor
strip
conductor
planar 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.)
Withdrawn
Application number
EP95117629A
Other languages
German (de)
English (en)
Inventor
Matthias Dr. Dipl.-Phys. Klauda
Claus Dr. Dipl.-Phys. Schmidt
Wolfgang Grothe
Stefan Müller
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0732762A1 publication Critical patent/EP0732762A1/fr
Withdrawn legal-status Critical Current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
    • H01P1/20354—Non-comb or non-interdigital filters
    • H01P1/20363—Linear resonators
    • 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
    • H01P1/20354—Non-comb or non-interdigital filters
    • H01P1/20381—Special shape resonators

Definitions

  • the invention is based on a planar filter according to the preamble of the main claim.
  • a microstrip line filter is known in which several strip lines are arranged side by side. The striplines overlap over a portion of their length and are thus coupled to their respective neighbors.
  • waveguide filters are also known in which pole points in the damping are generated by coupling modes between non-adjacent resonators by means of slit diaphragms.
  • planar filter with the characterizing features of the main claim has the advantage that by Coupling of non-adjacent, ie adjacent, stripline zeros in the transfer function H (s) and thus pole points in the stop band of the filter can be generated. Due to these singularities in damping, these filters have a higher slope.
  • the manufacturing outlay for the planar filter is reduced.
  • the degree of coupling and thus the effectiveness of the coupling increases advantageously if the strip conductors are coupled to the coupling strip conductor on the side surfaces.
  • the filter characteristic is improved, since undesirable coupling-overs are thereby reduced.
  • the coupling strip conductor is as short as possible, it is only slightly lossy, which also increases the degree of coupling.
  • Adjusting the characteristic impedance of the coupling strip conductor reduces undesired reflections during coupling and thereby in turn increases the coupling efficiency.
  • a strip line 2 forms the input strip line and in turn a strip line 6 forms the output strip line.
  • the left strip conductor 3, the middle strip conductor 4 and the right strip conductor 5 are arranged between the input strip conductor 2 and the output strip conductor 6.
  • the strip conductors all have an elongated, almost rectangular shape and each overlap their length in one piece in their transverse projection. In the area of these overlaps, the strip lines 2, 3, 4, 5, 6 are separated from each other in pairs only by a small gap, which results in a coupling of the strip lines 2, 3, 4, 5, 6 which overlap in this area.
  • a coupling strip conductor 7 is provided, which is coupled to the end face of the left strip conductor 3 and separated from it by a gap, and which connects this end face of the left strip conductor 3 with the end face of the right strip conductor 5 connects, a gap also being present between the coupling strip conductor 7 and the right strip conductor 5.
  • This arrangement forms a planar filter for filtering high-frequency electromagnetic waves.
  • the transmission and blocking characteristics of the planar filter are determined by the geometry of the planar filter and by the material properties of the strip conductors 2, 3, 4, 5, 6 and the substrate 1. This can be expressed by the transfer function H (s).
  • the coupling strip conductor 7 couples strip conductors 3, 5 which are not adjacent to one another and which are coupled to one another only indirectly via the central strip conductor 4 without the coupling strip conductor 7. Due to the coupling of the left strip conductor 3 with the right strip conductor 5, there are zero points in the transfer function H (s), which appear as damping poles in the blocking region of the planar filter. This presence of singularities in the damping range means that this planar filter can produce a significantly higher slope than with known planar, side-coupled filters.
  • the coupling strip conductor 7 has the same standardized width as the input strip conductor 2 and the output strip conductor 6. As a result, these three strip conductors 2, 6, 7 have a standardized characteristic impedance Z 0 , which is usually 50 ⁇ . In addition, it is advantageous to choose the length of the coupling stripline 7 as a whole multiple of half the wavelength ⁇ of the center frequency of the filter in order to effect an optimal coupling to the striplines 3, 5 to be coupled together.
  • FIG. 2 shows a further exemplary embodiment of a planar filter, the numbering of the elements from FIG. 1 being adopted.
  • the filter shown has an additional strip conductor 8, which is arranged with respect to the coupling order between the middle strip conductor 4 and the right strip conductor 5.
  • a dimensioning rule for the planar band filter shown here is given as an example in this figure, which can also be used for other filters.
  • All strip lines 2, 3, 4, 5, 6, 8 have an electrical length of ⁇ , where ⁇ is the wavelength at the center frequency of the bandpass filter.
  • the strip lines 2, 3, 4, 5, 6, 8 each overlap over a length of ⁇ / 4.
  • the coupling strip conductor 7 is arranged here for coupling the input strip conductor 2 to the right strip conductor 5.
  • the coupling strip conductor 7 is not coupled to the end faces of the two strip conductors 2, 5, but rather also to their side surfaces.
  • the length of the coupling zones is ⁇ / 4.
  • planar filters shown in the two exemplary embodiments have coupling strip conductors 7 which, like the other strip conductors 2, 3, 4, 5, 6, 8, are arranged directly on the substrate 1.
  • the coupling strip conductor 7 is arranged in a different plane than the strip conductors 2, 3, 4, 5, 6, 8. This is explained in more detail here with reference to FIG. 1.
  • the coupling strip conductor 7 has a short length and also has a distance from the strip conductor 4 lying between the two strip conductors 3, 5 to be coupled to one another, which causes the least possible coupling with this strip conductor 4. The lower the level of this interfering coupling, the more lossless and exact the filter will work. Furthermore, the coupling strip conductor 7 should be adapted to the characteristic impedance Z 0 in order to avoid reflections. This adaptation is most likely to be achieved if the coupling strip conductor 7 has a constant width W (Z 0 ). In contrast, the strip conductors 3, 4, 5 do not necessarily have to have a uniform wave resistance and can therefore also vary in their width.
EP95117629A 1995-03-15 1995-11-09 Filtre à structure plane Withdrawn EP0732762A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19509251 1995-03-15
DE19509251A DE19509251A1 (de) 1995-03-15 1995-03-15 Planares Filter

Publications (1)

Publication Number Publication Date
EP0732762A1 true EP0732762A1 (fr) 1996-09-18

Family

ID=7756666

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95117629A Withdrawn EP0732762A1 (fr) 1995-03-15 1995-11-09 Filtre à structure plane

Country Status (3)

Country Link
US (1) US5648747A (fr)
EP (1) EP0732762A1 (fr)
DE (1) DE19509251A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004023599A1 (fr) * 2002-09-03 2004-03-18 Robert Bosch Gmbh Capteur a radar pulse

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3379326B2 (ja) * 1996-02-20 2003-02-24 三菱電機株式会社 高周波フィルタ
CA2197253C (fr) * 1997-02-11 1998-11-17 Com Dev Limited Filtres planaire bimode et sa methode de construction
US6124767A (en) * 1998-05-21 2000-09-26 Delphi Components, Inc. RF/Microwave oscillator
WO2000026985A1 (fr) * 1998-11-02 2000-05-11 Jury Vyacheslavovich Kislyakov Filtre micro-ondes
DE10120507B4 (de) 2000-04-27 2004-03-25 Kyocera Corp. Filter mit mehreren Elementen
US7236068B2 (en) 2002-01-17 2007-06-26 Paratek Microwave, Inc. Electronically tunable combine filter with asymmetric response
JP3860559B2 (ja) * 2003-05-20 2006-12-20 株式会社東芝 帯域通過フィルタ
KR100577006B1 (ko) * 2003-12-24 2006-05-10 한국전자통신연구원 비대칭 주파수 특성을 갖는 마이크로스트립 교차결합대역통과필터
US7355494B2 (en) * 2004-09-03 2008-04-08 Taiyo Yuden Co., Ltd. Band-pass filter
KR100605425B1 (ko) * 2004-10-18 2006-07-28 한국전자통신연구원 마이크로스트립형 대역통과필터
JP4171015B2 (ja) * 2005-09-29 2008-10-22 株式会社東芝 フィルタ及びこれを用いた無線通信装置
RU2463690C2 (ru) * 2010-01-21 2012-10-10 Корпорация "САМСУНГ ЭЛЕКТРОНИКС Ко., Лтд." Двухчастотный инвертор проводимости/сопротивления на основе одномерных метаматериалов, имеющий полосу запирания между рабочими частотами

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4418324A (en) * 1981-12-31 1983-11-29 Motorola, Inc. Implementation of a tunable transmission zero on transmission line filters
US4423396A (en) * 1980-09-30 1983-12-27 Matsushita Electric Industrial Company, Limited Bandpass filter for UHF band
EP0285503A1 (fr) * 1987-03-31 1988-10-05 Thomson-Csf Filtre comportant des éléments à constantes réparties associant deux types de couplage
EP0506476A1 (fr) * 1991-03-29 1992-09-30 Ngk Insulators, Ltd. Filtre diélectrique avec des électrodes de couplage pour relier des résonateurs ou des électrodes, et méthode pour ajuster la caractéristique de fréquence du filtre

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2669476A1 (fr) * 1990-11-21 1992-05-22 Valtronic France Filtre passif passe-bande.
JP2863387B2 (ja) * 1992-09-30 1999-03-03 日本碍子株式会社 積層型誘電体フィルター
FR2706084A1 (fr) * 1993-06-04 1994-12-09 Valtronic Ind Sa Filtre passif et procédé de fabrication d'un tel filtre.

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4423396A (en) * 1980-09-30 1983-12-27 Matsushita Electric Industrial Company, Limited Bandpass filter for UHF band
US4418324A (en) * 1981-12-31 1983-11-29 Motorola, Inc. Implementation of a tunable transmission zero on transmission line filters
EP0285503A1 (fr) * 1987-03-31 1988-10-05 Thomson-Csf Filtre comportant des éléments à constantes réparties associant deux types de couplage
EP0506476A1 (fr) * 1991-03-29 1992-09-30 Ngk Insulators, Ltd. Filtre diélectrique avec des électrodes de couplage pour relier des résonateurs ou des électrodes, et méthode pour ajuster la caractéristique de fréquence du filtre

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
"Filters with Single Transmission Zeros at Real or Imaginary Frequencies", IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES, vol. MTT-24, no. 4, April 1976 (1976-04-01), pages 172 - 181
S.B. COHN: "Parallel-Coupled Transmission-Line-Resonator Filters", IRE TRANS. ON MICROWAVE THEORY AND TECHNIQUES, 1958, pages 223FF

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004023599A1 (fr) * 2002-09-03 2004-03-18 Robert Bosch Gmbh Capteur a radar pulse

Also Published As

Publication number Publication date
US5648747A (en) 1997-07-15
DE19509251A1 (de) 1996-09-19

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