EP0367347A1 - UHF-Bandpassfilter - Google Patents

UHF-Bandpassfilter Download PDF

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Publication number
EP0367347A1
EP0367347A1 EP89202737A EP89202737A EP0367347A1 EP 0367347 A1 EP0367347 A1 EP 0367347A1 EP 89202737 A EP89202737 A EP 89202737A EP 89202737 A EP89202737 A EP 89202737A EP 0367347 A1 EP0367347 A1 EP 0367347A1
Authority
EP
European Patent Office
Prior art keywords
printed circuit
filter according
filter
resonator
resonators
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.)
Granted
Application number
EP89202737A
Other languages
English (en)
French (fr)
Other versions
EP0367347B1 (de
Inventor
Pierre c/o Société Civile S.P.I.D. Chanteau
Eric c/o Société Civile S.P.I.D. Da Silva
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.)
Philips Electronique Gran Public
Koninklijke Philips NV
Original Assignee
Philips Electronique Gran Public
Philips Gloeilampenfabrieken NV
Koninklijke Philips Electronics NV
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 Philips Electronique Gran Public, Philips Gloeilampenfabrieken NV, Koninklijke Philips Electronics NV filed Critical Philips Electronique Gran Public
Publication of EP0367347A1 publication Critical patent/EP0367347A1/de
Application granted granted Critical
Publication of EP0367347B1 publication Critical patent/EP0367347B1/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
    • H01P1/205—Comb or interdigital filters; Cascaded coaxial cavities
    • H01P1/2053—Comb or interdigital filters; Cascaded coaxial cavities the coaxial cavity resonators being disposed parall to each other

Definitions

  • the present invention relates to a UHF bandpass filter, comprising at least two resonators each located in a cavity.
  • Such filters are well known and used in particular for filtering the various television channels in cable networks.
  • the object of the present invention is to eliminate this drawback.
  • a bandpass filter is particularly remarkable in that the coupling between input or output and resonator, and between resonators between them is carried out by means of lines drawn on a printed circuit crossing the partitions of the cavities, said lines being arranged in such a way that the transmission of energy between said lines and said resonators takes place exclusively by radiation.
  • a filter is also remarkable in that the said cavities are formed by the assembly of two molded half-shells, one of which comprises elements of form such that they each constitute the inductive part of each resonator, the associated capacitor being mounted in sandwich between said inductive element and the bottom of the other half-shell.
  • each resonator with a variable capacitor for adjusting the central frequency of the filter, in this case it is advantageous that said inductive elements have a tubular shape and that the adjustable core of each variable capacitor is housed in the hollow of said corresponding tubular element, so that said adjustable core is accessible for adjustment through the tube.
  • said coupling printed circuit consists of a semi-rigid material, it is sandwiched in slots made in each half-shell, and said slots are slightly offset to mechanically wedge said printed circuit and jointly ensure ground contacts between the printed circuit and said shells.
  • the filter has no welds which reduces manufacturing costs and further guarantees the reproducibility of the quality.
  • the UHF band has 45 channels numbered from 21 to 65 for which selectivity standards are imposed (1/300 ⁇ F / F ⁇ 1/30); to obtain this selectivity over the entire band, it is advantageous, all other things being equal, to provide several etchings of the printed circuit, a given etch making it possible to obtain the desired coupling rate for a series of several adjacent channels.
  • variable attenuator is mounted on the printed circuit to be able to modify the attenuation of the transmission.
  • This attenuator is soldered to the printed circuit but it is located in an additional cavity so that the selectivity of the filter is not affected.
  • FIG. 1 represents the lower half-shell (DCI) of the filter of generally elongated rectangular shape comprising four interior walls P1, P2, P3, P4 which delimit five cavities; the extreme cavities include inductive elements S1, S2, S3, S4 which are here tubular, hollow and rough foundry for example in zamac but this is not an obligation: similar shapes would be suitable, as well as a metallized plastic molding surface.
  • the interior walls are provided with notches to accommodate the printed circuit (CI) comprising the coupling lines.
  • the filter housing also has an upper half-shell (DCS) and the assembly is shown in cross section in Figure 2a; the housing (DCS, DCI) is cut in line with one of the inductive elements (SI) opposite which is a housing (LI); the elements LI and SI are arranged to, during assembly, hold in place a variable capacitor (VOC with dotted line in the figure) whose adjustable core (NA) is engaged in the hollow of the inductive element and thus accessible with a screwdriver according the arrow (TV); to compensate for manufacturing gaps and ensure good electrical contact, an elastic metal washer (RE), for example of the ONDUFLEX type, is provided.
  • DCS half-shell
  • the upper half-shell obviously has four walls facing the walls P1, P2, P3, P4; they are also indented to create a passage (OP) on the printed circuit; in FIG. 2b the passage (OP) is shown enlarged to show that the notches are slightly offset so that the printed circuit (CI) is clearly deformed and wedged by the half-shells during assembly; thus an electrical contact can be obtained for example at points A and B between the housings and copper lines present at the right of the walls; to fix ideas, the outside diameter of the inductive element is 6 mm and its height is 50 mm, each half-shell is 35 mm high or 70 mm for the filter whose width is 20 mm and the length 90 mm; the central cavity is provided to house the generally used attenuator and, in this case, soldered on the printed circuit.
  • Each inductive element (SI) with its associated capacitor (VOC) form an adjustable oscillating circuit; due to the fact that the HF currents propagate by skin effect, that is to say in the case present on the external surface of each inductive element, the momentary introduction of the adjustment screwdriver (TV) inside the tube does not modify not the operation of the oscillating circuit.
  • FIG. 3 An example of engraving is shown in Figure 3; the copper lines are represented there either as a line or a hatched area.
  • Each circuit has of course the same external dimension, for example 25 ⁇ 90, it is made of semi-rigid material to elastically support the above deformation, only the designs of copper are different from one engraving to another.
  • the inductive element S1 with its associated VOC capacitor, has been shown in dotted lines.
  • the input signal to be filtered arrives at point EN and, via line L10, it excites the inductive element S1 which reacts with its VOC capacity and in turn excites line L11; energy transmission here takes place exclusively by radiation; the signal collected by L11 is transmitted galvanically by the conductor G1, which crosses the wall P1, to the line L20; the inductive element S2 is excited by the signal present in L20 and, in turn, it excites the line L21; the energy transmission between S2 and L21 is here also exclusively by radiation; the signal is then transmitted by the conductor G2, which crosses the wall P2, to an attenuator connected between the terminals A1 and A2; the signal is then transmitted by the conductor G3, etc ... for, after passing through the walls P3, P4 and by the inductive elements S3 and S4, stand out on the output terminal SO where the filtered signal is available.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)
  • Filters And Equalizers (AREA)
EP89202737A 1988-11-04 1989-10-30 UHF-Bandpassfilter Expired - Lifetime EP0367347B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8814425 1988-11-04
FR8814425A FR2638902A1 (fr) 1988-11-04 1988-11-04 Filtre passe-bande uhf

Publications (2)

Publication Number Publication Date
EP0367347A1 true EP0367347A1 (de) 1990-05-09
EP0367347B1 EP0367347B1 (de) 1994-04-06

Family

ID=9371586

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89202737A Expired - Lifetime EP0367347B1 (de) 1988-11-04 1989-10-30 UHF-Bandpassfilter

Country Status (5)

Country Link
US (1) US4990869A (de)
EP (1) EP0367347B1 (de)
JP (1) JPH02172301A (de)
DE (1) DE68914396T2 (de)
FR (1) FR2638902A1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5543758A (en) * 1994-10-07 1996-08-06 Allen Telecom Group, Inc. Asymmetric dual-band combine filter
FI110392B (fi) * 1995-09-26 2003-01-15 Solitra Oy Koaksiaaliresonaattorisuodatin, koaksiaaliresonaattorisuodattimen valmistusmenetelmä, koaksiaaliresonaattorirakenne ja koaksiaaliresonaattorirakenteen valmistusmenetelmä
FI110391B (fi) * 1995-11-08 2003-01-15 Solitra Oy Kotelorakenteinen suodatin

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2519524A (en) * 1947-08-13 1950-08-22 Hazeltine Research Inc Multiple-tuned wave-selector system
US3693115A (en) * 1970-12-28 1972-09-19 American Electronic Lab Mechanical tunable bandpass filter
US4740765A (en) * 1985-09-30 1988-04-26 Murata Manufacturing Co., Ltd. Dielectric filter

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2045560C3 (de) * 1970-09-15 1978-03-09 Standard Elektrik Lorenz Ag, 7000 Stuttgart Mikrowellenfilter aus quaderförmigen Hohlraumresonatoren
JPS5924167Y2 (ja) * 1978-12-28 1984-07-18 アルプス電気株式会社 マイクロ波用フイルタ
US4477785A (en) * 1981-12-02 1984-10-16 Communications Satellite Corporation Generalized dielectric resonator filter
JPS58114503A (ja) * 1981-12-26 1983-07-07 Fujitsu Ltd フイルタの結合構造
US4621245A (en) * 1984-05-08 1986-11-04 Zenith Electronics Corporation Intermediate frequency filter for a DBS receiver
JPS625702A (ja) * 1985-07-01 1987-01-12 Fujitsu Ltd 帯域通過形フイルタ
JPS62243402A (ja) * 1986-04-15 1987-10-23 Murata Mfg Co Ltd 誘電体フイルタ
JPS6324701A (ja) * 1986-07-16 1988-02-02 Murata Mfg Co Ltd 分布定数線路装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2519524A (en) * 1947-08-13 1950-08-22 Hazeltine Research Inc Multiple-tuned wave-selector system
US3693115A (en) * 1970-12-28 1972-09-19 American Electronic Lab Mechanical tunable bandpass filter
US4740765A (en) * 1985-09-30 1988-04-26 Murata Manufacturing Co., Ltd. Dielectric filter

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, vol. 11, no. 171 (E-512)[2618], 2nd juin 1987; & JP-A-62 005 702 (FUJITSU LTD) 12-01-1987 *
PATENT ABSTRACTS OF JAPAN, vol. 12, no. 115 (E-599)[2962], 12 avril 1988; & JP-A-62 243 402 (MURATA MFG CO., LTD) 23-10-1987 *
PATENT ABSTRACTS OF JAPAN, vol. 12, no. 232 (E-628)[3079], 30 Juin 1988; & JP-A-63 024 701 (MURATA MFG CO., LTD) 02-02-1988 *
SIEMENS-BAUTEILE-INFORMATIONEN, vol. 6, no. 6, decembre 1968, pages 200-201, Munich, DE; K. PICHLER et al.: "Vierkreis-UHF-Bandfilter YH AF 1010" *

Also Published As

Publication number Publication date
FR2638902A1 (fr) 1990-05-11
DE68914396T2 (de) 1994-11-10
DE68914396D1 (de) 1994-05-11
JPH02172301A (ja) 1990-07-03
EP0367347B1 (de) 1994-04-06
US4990869A (en) 1991-02-05

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