EP0693794A1 - Filtre céramique hyperfréquence - Google Patents

Filtre céramique hyperfréquence Download PDF

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Publication number
EP0693794A1
EP0693794A1 EP95110347A EP95110347A EP0693794A1 EP 0693794 A1 EP0693794 A1 EP 0693794A1 EP 95110347 A EP95110347 A EP 95110347A EP 95110347 A EP95110347 A EP 95110347A EP 0693794 A1 EP0693794 A1 EP 0693794A1
Authority
EP
European Patent Office
Prior art keywords
resonators
coaxial resonators
frequency
filter
coaxial
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.)
Ceased
Application number
EP95110347A
Other languages
German (de)
English (en)
Inventor
Christian Dipl.-Ing. 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 EP0693794A1 publication Critical patent/EP0693794A1/fr
Ceased 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

Definitions

  • the present invention relates to a microwave ceramic filter according to the preamble of patent claim 1.
  • microwave ceramic filters are used to select useful frequencies lying in a predetermined pass frequency band, i. H. to pass and block frequencies lying outside this pass frequency band as completely as possible.
  • microwave ceramic filters are constructed as follows: through holes are provided at predetermined intervals in a body made of dielectric ceramic material, for example with a cuboid shape. Electrically conductive layers are applied to the inner peripheral surfaces of these through holes, while the ceramic body is metallized on all sides apart from at least one end face on which the through holes emerge on one side. Each region of the ceramic body containing a through hole forms a coaxial resonator. These coaxial resonators are coupled to one another in a suitable manner to complete the filter. This can be done, for example, by providing a coupling hole in the ceramic body between two through holes. Ceramic bodies of this type are known, for example, from US Pat. No. 4,464,640.
  • a microwave ceramic filter known from DE-OS 42 32 054
  • the selection has been increased in that at least one coaxial resonator forming a bandstop is connected in series to the filter defining the pass frequency band with a plurality of ceramic resonators coupled to one another.
  • a damping peak outside the pass frequency band is realized outside the pass frequency band at a specific point at which there is an interference frequency, as a result of which the interference frequency is sufficiently attenuated.
  • the present invention has for its object to provide a microwave ceramic filter of the type in question with even higher selection and less temperature dependence.
  • an embodiment of a microwave ceramic filter according to the invention is formed by two coaxial resonators 1 and 2, which have a cuboid shape and each contain a through hole 3 and 4, respectively. Electrically conductive layers are applied to the inner circumferential surfaces of these through holes, while the ceramic body is metallized on all sides apart from at least one end face on which the through hole emerges on one side.
  • These coaxial resonators are coupled to one another in a suitable manner to complete the filter.
  • an insulating insert 5 is provided between the coaxial resonators 1 and 2, which can engage in the through holes 3 and 4, for example, via lugs (not shown).
  • a bracket 6 can be provided for the mechanically stable connection of the coaxial resonators 1 and 2, the z. B. is soldered, so that the additional advantage for the user arises that the filter is present as a one-piece element for assembly.
  • a series connection of a microwave resonator of the type in question forms a bandstop.
  • This case is shown schematically in FIG. 2, in which a microwave resonator 1 lies in series between inputs 10 and 11 and outputs 12 and 13.
  • FIG. 3 The characteristic of such a resonator operated as a bandstopper is shown in FIG. 3, in which an output variable of the microwave resonator operated as a bandstopper, about a signal amplitude A is shown as a function of frequency f.
  • the bandstop can be seen to have a high attenuation peak at the resonance frequency f r , ie it works in this case as a bandstop.
  • a plurality of such resonators operated as a bandstop filter are connected in series, compared to known filters, for example according to DE-OS 42 32 054, there is an increased additional selection or attenuation in a predetermined frequency range.
  • Such a damping characteristic for an embodiment with two coaxial resonators connected in series is shown in FIG. 4, in which the amplitude A is also plotted against the frequency f.
  • coaxial resonators are connected in series as a bandstop filter and have resonance frequencies that deviate from the predetermined frequency at which there is high attenuation outside the pass frequency band, this results in a wider attenuation curve with two bumps typical of the embodiment with two resonators.
  • the deviation of the resonance frequencies of the coaxial resonators from the frequency in which the attenuation range is to be can be, for example, + - or -5 MHz, whereby of these frequency deviations a deviation range of + 5- and -3MHz or + 3- and -5MHz can be possible.
  • a temperature drift of the resonance frequency of the individual resonators is additionally reduced or the manufacturing tolerance for setting the resonator frequencies can be reduced.
  • the invention is not limited to the series connection of two individual resonators according to the embodiment according to FIG. 2. Depending on the application, several individual resonators can also be used.
  • the individual resonators can in principle be produced with connections in the form of solder lugs or with integrated HF connections, as is described, for example, in DE-OS 42 29 165.
  • the ceramic bodies 1 and 2 forming the resonators according to FIG. 1 can be metallized, apart from their end faces at which the through holes 3, 5 emerge.
  • ⁇ means the wavelength corresponding to the resonance frequencies of the resonators.

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EP95110347A 1994-07-20 1995-07-03 Filtre céramique hyperfréquence Ceased EP0693794A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19944425707 DE4425707C2 (de) 1994-07-20 1994-07-20 Mikrowellen-Keramikfilter
DE4425707 1994-07-20

Publications (1)

Publication Number Publication Date
EP0693794A1 true EP0693794A1 (fr) 1996-01-24

Family

ID=6523697

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95110347A Ceased EP0693794A1 (fr) 1994-07-20 1995-07-03 Filtre céramique hyperfréquence

Country Status (2)

Country Link
EP (1) EP0693794A1 (fr)
DE (1) DE4425707C2 (fr)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2630490A (en) * 1946-01-03 1953-03-03 Paul I Richards Coaxial transmission line filter
JPS57199302A (en) * 1981-06-02 1982-12-07 Murata Mfg Co Ltd Manufacture for dielectric coaxial tem resonator
US4464640A (en) 1981-10-02 1984-08-07 Murata Manufacturing Co., Ltd. Distribution constant type filter
US4636759A (en) * 1984-03-30 1987-01-13 Murata Manufacturing Co., Ltd. Electrical trap construction
US4862122A (en) * 1988-12-14 1989-08-29 Alcatel Na, Inc Dielectric notch filter
JPH0617702A (ja) * 1992-03-09 1994-01-25 Goetze Ag 内燃機関のシリンダヘッドガスケット
DE4229165A1 (de) 1992-09-01 1994-03-10 Siemens Matsushita Components Keramik-Koaxialresonator
DE4232054A1 (de) 1992-09-24 1994-03-31 Siemens Matsushita Components Mikrowellen-Keramikfilter

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2413009A1 (de) * 1974-03-18 1975-03-27 Perthen Gmbh Messgeraete Und A Kompensation der grundwelle eines unregelmaessigen messgroessen-verlaufs durch filterung

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2630490A (en) * 1946-01-03 1953-03-03 Paul I Richards Coaxial transmission line filter
JPS57199302A (en) * 1981-06-02 1982-12-07 Murata Mfg Co Ltd Manufacture for dielectric coaxial tem resonator
US4464640A (en) 1981-10-02 1984-08-07 Murata Manufacturing Co., Ltd. Distribution constant type filter
US4636759A (en) * 1984-03-30 1987-01-13 Murata Manufacturing Co., Ltd. Electrical trap construction
US4862122A (en) * 1988-12-14 1989-08-29 Alcatel Na, Inc Dielectric notch filter
JPH0617702A (ja) * 1992-03-09 1994-01-25 Goetze Ag 内燃機関のシリンダヘッドガスケット
DE4229165A1 (de) 1992-09-01 1994-03-10 Siemens Matsushita Components Keramik-Koaxialresonator
DE4232054A1 (de) 1992-09-24 1994-03-31 Siemens Matsushita Components Mikrowellen-Keramikfilter

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 10, no. 145 (E - 407)<2202> 28 May 1986 (1986-05-28) *
PATENT ABSTRACTS OF JAPAN vol. 7, no. 49 (E - 161)<1194> 25 February 1983 (1983-02-25) *

Also Published As

Publication number Publication date
DE4425707C2 (de) 1996-12-19
DE4425707A1 (de) 1996-02-01

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