EP0326498B1 - Resonanzschaltung und Filter mit dergleichen - Google Patents

Resonanzschaltung und Filter mit dergleichen Download PDF

Info

Publication number
EP0326498B1
EP0326498B1 EP19890400242 EP89400242A EP0326498B1 EP 0326498 B1 EP0326498 B1 EP 0326498B1 EP 19890400242 EP19890400242 EP 19890400242 EP 89400242 A EP89400242 A EP 89400242A EP 0326498 B1 EP0326498 B1 EP 0326498B1
Authority
EP
European Patent Office
Prior art keywords
filter
resonator
micro tape
resonators
sides
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
EP19890400242
Other languages
English (en)
French (fr)
Other versions
EP0326498A1 (de
Inventor
Henry Havot
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.)
Telediffusion de France ets Public de Diffusion
Orange SA
Original Assignee
Telediffusion de France ets Public de Diffusion
France Telecom SA
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 Telediffusion de France ets Public de Diffusion, France Telecom SA filed Critical Telediffusion de France ets Public de Diffusion
Publication of EP0326498A1 publication Critical patent/EP0326498A1/de
Application granted granted Critical
Publication of EP0326498B1 publication Critical patent/EP0326498B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • H01P1/20381—Special shape resonators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P7/00—Resonators of the waveguide type
    • H01P7/08—Strip line resonators
    • H01P7/082—Microstripline resonators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P7/00—Resonators of the waveguide type
    • H01P7/08—Strip line resonators
    • H01P7/088—Tunable resonators

Definitions

  • the present invention relates to a resonant circuit and a filter using this circuit.
  • the technical field of the invention is radioelectricity, electronics, filtering and multiplexing of frequencies, etc.
  • the invention finds a particular application in the construction of stations for receiving television signals broadcast by satellites.
  • One of the problems posed in this technique is to produce, in the reception station, a filter operating in the frequency band 950-1750 MHz and making it possible to very easily rearrange the frequency plans, according to the availability of channels and user demand.
  • the object of the present invention is precisely to remedy this deficiency by proposing a circuit and a filter which have all these advantages.
  • Ring resonators which operate on the principle of establishing a standing wave regime.
  • a conductive tape or microstrip is used, the length of which is equal to the wavelength associated with the resonant frequency (or possibly at half the wavelength).
  • the shape of the ribbon is limited to a few simple shapes capable of leading to a high overvoltage. There are therefore in practice always circular rings or possibly U.
  • the dimension of the circuit is, in essence, of the order of the wavelength. As soon as the frequency becomes low, the dimensions of the resonator become prohibitive. For example, at 30 MHz a resonator of the prior art constituted by a circular ribbon will have a diameter of 1.60 m.
  • the object of the present invention is precisely to remedy these drawbacks. To this end, it recommends a resonant circuit still using a conductive tape but under very different operating conditions from those of the prior art.
  • the ribbon plays the role of pure inductance in the band of use of the circuit. To do this, its length is taken less than ⁇ / 8, if ⁇ is the wavelength associated with the working frequency of the resonator.
  • resonant loops comprising an interrupted microstrip loop of length ⁇ / 8 and a capacitor in the opening are already known from the prior art, see for example the document "1986 IEEE-MTT-S INTERNATIONAL MICROWAVE SYMPOSIUM DIGEST , Baltimore, Maryland, June 2-4, 1986, pages 411-414, IEEE, New York, US; M. MAKIMOTO et al .: 'Varactor tuned bandpass filters using microstrip-line ring resonators' ".
  • the ribbon is a simple inductive element means that its shape is in no way critical. It is therefore possible to retain any desired shape, in particular shapes that allow the ribbon to be folded up to save space.
  • the subject of the present invention is a filter comprising several resonant circuits as defined above. These circuits (identical or different) are coupled to each other.
  • the coupling is tight, critical or loose depending on the case.
  • shape of the ribbon is not critical, as has been pointed out above, we are free to choose the shape best suited to the chosen coupling.
  • the invention thus finds a wide field of application. Filters from 30 MHz to 2 or 3 GHz can be produced. Bandwidth ranges from a few fractions of a percent to about 10%.
  • a resonant circuit according to the invention is shown in Figure 1, in top view (a), in section (b) and in a variant with a metal case (c).
  • This element comprises a planar substrate 10, made of dielectric material (for example epoxy glass, Teflon, etc.).
  • a conductive layer 12 in copper for example
  • a microstrip 14 made of conductive material ( copper for example).
  • the circuit is arranged in a metal housing 20 and the ground plane is constituted by the metal walls 22 lower and upper.
  • the microstrip draws an "open" outline in the sense that it incompletely surrounds part of the plane. In other words, it has at least one opening.
  • this outline is rectangular and the opening (single) is referenced 16.
  • Connected through this opening is a capacitor 18 adjustable or adjusted once and for all.
  • FIG. 2 The equivalent electrical diagram is shown in FIG. 2, again considering the element in plan view (a) and in section (b) in the variant where the ground plane is arranged under the substrate.
  • inductance L due to the non-rectilinear microstrip
  • tuning capacitor Ca connected between the ends of the ribbon
  • parasitic capacitors Cp which correspond to the volume separating the microstrip and the ground plan.
  • l the length of the microstrip and by ⁇ the wavelength in the substrate at the operating frequency.
  • the length l is always less than or equal to ⁇ / 8 in order to be able to be assimilated to an inductor independent of the frequency.
  • the wavelength ⁇ o in the substrate corresponding to fo is determined, then the value of ⁇ o / 8 and a microstrip length less than this value is chosen.
  • the value of the inductance L can be obtained approximately by the formula:
  • the parasitic capacitance Cp value can be obtained by a formula of the type:
  • the parameters of the resonant circuit are defined.
  • the length of the coupled microstrip and the degree of coupling are determined experimentally.
  • FIG. 5 shows a complete filter composed of five circuits C1 to C5 on a single substrate 10 with an input microstrip E and an output microstrip S.
  • the filter of the invention uses a direct coupling at the input and output which performs the adaptation between the first and the last resonators and the circuits of use.
  • the contours drawn by the microstrip are rectangular, two adjacent contours having two parallel sides. But one could also use triangular circuits for example mounted head to tail.
  • circuits can be nested one inside the other.
  • Figure 6 gives the main dimensions of an example filter designed to have a center frequency fo equal to 1131.620 MHz. Dimensions are in millimeters. The capacitors are adjustable from 0.5 to 5 pF. The substrate is made of 16/10 mm thick epoxy glass.
  • the contours drawn by the microstrips are U-shaped, that is to say rectangles with one side missing.
  • the orientation of these U alternates from one resonator to another, so that the capacitors are placed on both sides of the filter, sometimes at the top, sometimes at the bottom (in the sense of figure 6).
  • Figures 7, 8 and 9 show the attenuation characteristic of a filter obtained according to the invention, with different frequency scales (on the abscissa).
  • the curve goes from 1 to 2000 MHz; in FIG. 8, the width of the measurement band is 100 MHz; in Figure 9, it is 40 MHz.
  • the curve in FIG. 10 represents the group time characteristic of the filter in nanoseconds by division.

Claims (3)

  1. Filter mit Flächenresonatoren, gebildet durch wenigstens zwei gekoppelte Resonatoren, wobei jeder Resonator umfaßt:
    - einen die Masseebene bildenden Leiter (12),
    - dieser Masseebene gegenüberstehend ein leitendes Mikrobändchen (14), aufgebracht auf eine der Seiten eines dielektrischen Substrats, wobei dieses Mikrobändchen eine Kontur beschreibt, die eine erste, durch eine Öffnung (16) unterbrochene Seite aufweist sowie eine zweite und eine dritte Seite, nichtunterbrochen und an an die erste Seite anschließend, und eventuell eine vierte, der ersten gegenüberliegende Seite, wobei die Länge des Mikrobändchens kleiner als λ/8 ist, wobei λ die der Resonanzfrequenz des Resonators zugeordnete Wellenlänge ist,
    - einen Kondensator (18), quer eingeschaltet in die Öffnung (16), die die erste Seite unterbricht,
    wobei dieses Filter dadurch gekennzeichnet ist:
    a) daß es mehr als zwei in Kaskadenschaltung angeordnete gekoppelte Resonatoren (C1, C2, C3, C4, C5) umfaßt,
    b) daß die gekoppelten Resonatoren so angeordnet sind, daß die zweiten und dritten nichtunterbrochenen Seiten von zwei benachbarten Resonatoren sich Seite an Seite befinden, wobei die elektrische Kopplung zwischen zwei benachbarten Resonatoren (C1, C2), (C2, C3), (C3, C4), (C4, C5) über die zweiten und dritten Seiten erfolgt; daß die ersten Seiten der Resonatoren mit ihren Kondensatoren sowie die eventuellen vierten Seiten angeordnet sind längs der Längsseiten des Filters, einmal auf einer der Längsseiten, einmal auf der anderen,
    c) daß der erste Resonator (C1) des Filters mit einem Generaleingang verbunden ist durch ein Eingangsmikrobändchen (E), direkt verbunden mit dem Mikrobändchen des ersten Resonators, wobei dieses Eingangsmikrobändchen (E) eine Adaptierung herstellt zwischen dem ersten Resonator (C1) und den Anwendungs-bzw. Ausgangsschaltungen,
    d) daß der letzte Resonator (C5) verbunden ist mit einem Generalausgang durch ein Ausgangsmikrobändchen (S), direkt verbunden mit dem Mikrobändchen des letzten Resonators, wobei dieses Ausgangsmikrobändchen (S) eine Adaptierung herstellt zwischen dem letzten Resonator (5) und den Anwendungs- bzw. Ausgangsschaltungen.
  2. Filter nach Anspruch 1, dadurch gekennzeichnet, daß jedes Mikrobändchen nur drei Seiten umfaßt und eine dreieckige Form aufweist, wobei die verschiedenen Dreiecke der verschiedenen Resonatoren entgegengesetzt angeordnet sind.
  3. Filter nach Anspruch 1, dadurch gekennzeichnet, daß jedes Mikrobändchen einen einwärtsgebogenen Teil aufweist.
EP19890400242 1988-01-29 1989-01-27 Resonanzschaltung und Filter mit dergleichen Expired - Lifetime EP0326498B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8801060A FR2626716B1 (fr) 1988-01-29 1988-01-29 Filtre a resonateurs plans
FR8801060 1988-01-29

Publications (2)

Publication Number Publication Date
EP0326498A1 EP0326498A1 (de) 1989-08-02
EP0326498B1 true EP0326498B1 (de) 1994-11-09

Family

ID=9362768

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890400242 Expired - Lifetime EP0326498B1 (de) 1988-01-29 1989-01-27 Resonanzschaltung und Filter mit dergleichen

Country Status (3)

Country Link
EP (1) EP0326498B1 (de)
DE (1) DE68919239T2 (de)
FR (1) FR2626716B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6895262B2 (en) 1993-05-28 2005-05-17 Superconductor Technologies, Inc. High temperature superconducting spiral snake structures and methods for high Q, reduced intermodulation structures

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7231238B2 (en) 1989-01-13 2007-06-12 Superconductor Technologies, Inc. High temperature spiral snake superconducting resonator having wider runs with higher current density
FR2704983B1 (fr) * 1993-05-04 1995-06-09 France Telecom Filtre passe-bande a lignes couplees court-circuitees.
US5888942A (en) * 1996-06-17 1999-03-30 Superconductor Technologies, Inc. Tunable microwave hairpin-comb superconductive filters for narrow-band applications

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2751558A (en) * 1952-04-02 1956-06-19 Itt Radio frequency filter
NL7314269A (nl) * 1973-10-17 1975-04-21 Philips Nv Microgolfinrichting voorzien van een 1/2 lambda resonator.
CA1097755A (en) * 1976-02-26 1981-03-17 Mitsuo Makimoto Electrical tuning circuit
FR2510325B1 (fr) * 1981-07-24 1987-09-04 Thomson Csf Filtre hyperfrequence de petites dimensions, a resonateurs lineaires
JPS61128602A (ja) * 1984-11-28 1986-06-16 Pioneer Answerphone Mfg Corp マイクロ波用フイルタ

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6895262B2 (en) 1993-05-28 2005-05-17 Superconductor Technologies, Inc. High temperature superconducting spiral snake structures and methods for high Q, reduced intermodulation structures

Also Published As

Publication number Publication date
FR2626716B1 (fr) 1990-04-20
DE68919239T2 (de) 1995-05-18
FR2626716A1 (fr) 1989-08-04
EP0326498A1 (de) 1989-08-02
DE68919239D1 (de) 1994-12-15

Similar Documents

Publication Publication Date Title
EP0117178B1 (de) Mikrowellenfilter mit linienförmigen Resonatoren
EP0013222B1 (de) Diodenphasenschieber für Mikrowellen und elektronisch abtastende Antenne mit einem solchen Schieber
EP0285503B1 (de) Filter mit Elementen mit verteilten Parametern, wobei zwei Arten von Kopplungsvorrichtungen vorhanden sind
EP0127527B1 (de) Einstellungsverfahren, besonders Frequenzeinstellungsverfahren eines gedruckten Mikrostreifenleitungsfilters, und Filter nach dieser Art
EP2184801B1 (de) Differentialfiltervorrichtung mit koplanar gekoppelten Resonatoren und Filterantenne mit einer entsprechenden Vorrichtung
EP0047203B1 (de) Über eine grosse Bandbreite abstimmbares Mikrowellenfilter mit einem dielektrischen Resonator
EP2345104B1 (de) Differenz-dipolantennensystem mit einer koplanaren strahlungsstruktur und sender-/empfängereinrichtung
EP0145597A2 (de) Ebene periodische Antenne
EP2184803A1 (de) Vorrichtung zur Abdichtung eines Öffnungsfeldes eines Kraftfahrzeugs mit Hilfe eines Schiebepaneels, und entsprechendes Kraftfahrzeug
EP0108003B1 (de) Doppelstreifen-Resonator und nach dieser Art gestaltetes Filter
EP0165158A1 (de) Dielektrischer Filter mit veränderbarer Mittenfrequenz
EP0326498B1 (de) Resonanzschaltung und Filter mit dergleichen
EP0047686A1 (de) Hybrider Mikrowellenmischer
FR3047845A1 (fr) Plaque de reflexion electromagnetique a structure de metamateriau et dispositif miniature d'antenne comportant une telle plaque
EP0446108B1 (de) Dielektrischer Resonator mit Mikrowellenmetallstreifen und mit diesem Resonator ausgerüstete Vorrichtung
EP0281773B1 (de) Abstimmbares Mikrowellenfilter
EP0101369A1 (de) Banddurchlassfilter mit dielektrischen Resonatoren, mit negativer Kupplung zwischen Resonatoren
EP0649571B1 (de) Bandpassfilter mit gekoppelten resonatoren
EP0424255B1 (de) Filtereinheit und entsprechender Filter
EP0373028B1 (de) Passives Bandpassfilter
EP0296929B1 (de) Symmetrische Mikrowellenübertragungsleitung mit zwei koplanären Leitern
EP0045242A1 (de) In Hohlleitertechnik ausgeführtes Bandpassfilter für Mikrowellen
EP1067617B1 (de) Bandpassfilter
FR2675638A1 (fr) Dispositif resonateur dielectrique.
EP1568098B1 (de) Breitband-mikrowellenbandtrenneinrichtung

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE FR GB

17P Request for examination filed

Effective date: 19900111

17Q First examination report despatched

Effective date: 19920602

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: TELEDIFFUSION DE FRANCE

Owner name: FRANCE TELECOM

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE FR GB

REF Corresponds to:

Ref document number: 68919239

Country of ref document: DE

Date of ref document: 19941215

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)

Effective date: 19950118

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19971222

Year of fee payment: 10

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19971227

Year of fee payment: 10

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19980130

Year of fee payment: 10

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19990127

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19990127

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19990930

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19991103

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST