EP0071508B1 - Filtre hyperfréquence de petites dimensions à résonateurs linéaires - Google Patents

Filtre hyperfréquence de petites dimensions à résonateurs linéaires Download PDF

Info

Publication number
EP0071508B1
EP0071508B1 EP82401307A EP82401307A EP0071508B1 EP 0071508 B1 EP0071508 B1 EP 0071508B1 EP 82401307 A EP82401307 A EP 82401307A EP 82401307 A EP82401307 A EP 82401307A EP 0071508 B1 EP0071508 B1 EP 0071508B1
Authority
EP
European Patent Office
Prior art keywords
resonators
filter
capacitors
filters
resonator
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
Application number
EP82401307A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0071508A1 (fr
Inventor
Patrick Janer
Marie-Christine Henriot
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.)
Thales SA
Original Assignee
Thomson CSF 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 Thomson CSF SA filed Critical Thomson CSF SA
Publication of EP0071508A1 publication Critical patent/EP0071508A1/fr
Application granted granted Critical
Publication of EP0071508B1 publication Critical patent/EP0071508B1/fr
Expired 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
    • H01P1/20372—Hairpin resonators

Definitions

  • the present invention relates to filters made by means of linear resonators open at their two ends, known under the name of linear resonators ⁇ / 2 in which enters the category of hair pin resonators (hair pin resonators in Anglo-Saxon literature ) or U-shaped resonators.
  • Filters are also known, such as those called “comb-line filters for example, using ⁇ / 4 resonators, one of the ends of which is grounded. These filters, which use a technology radically different from that of open resonators in X / 2, have in the past been sometimes associated with tuning capacities, as shown in US Pat. No. 3,534,301 and the article published in the journal "IEEE Transactions on Microwave Theory and Techniques", Vol. MTT-18, May 1970, p. 278 to 280.
  • FIG. 1 shows a band pass filter with linear U-shaped resonators of the conventional type.
  • this is a filter produced on a wafer, 1, twice two inches, that is 5.08 x 5.08 cm, having a thickness of 1.27 mm; a graduated scale from 0 to 1 cm is placed next to the plate to show the enlargement ratio of the drawing.
  • the filter according to FIG. 1 comprises, in addition to the plate 1 made of alumina, a ground plane constituted by a gold deposit 10 ⁇ m thick covering all of that of the two faces of the plate which is not visible on the drawing.
  • a ground plane constituted by a gold deposit 10 ⁇ m thick covering all of that of the two faces of the plate which is not visible on the drawing.
  • two lines L i , L 2 are made by depositing gold 10 ⁇ m thick, and, between these two lines, six U-shaped resonators, H 1 to H s .
  • the lines L 1 , L 2 constitute the ports of the filter; they are mutually parallel and parallel to the vertical bars of the U of the resonators.
  • a filter of the type of that according to FIG. 1 is of course with fixed bandwidth since it does not have a tuning element whose characteristic would be easily adjustable.
  • FIG. 2 is a graph which gives, as a function of the frequency F expressed in megahertz, the value of the attenuation A, expressed in decibels, which the filter entails according to FIG. 1.
  • This graph shows that the filter has a bandwidth centered on 825 MHz and with a width of 55 MHz at 3 dB from the value at 825 MHz; it is for this bandwidth that the filter of figure 1 has been calculated, the U-shaped resonators of which have been chosen with a length equal to 70 mm, ie ⁇ / 2, where ⁇ is the wavelength in alumina corresponding to the frequency of 825 MHz.
  • these filters are linked to the length of the resonators, but in these known filters this length which, being substantially equal to half the average working wavelength in the filter, is not negligible.
  • these known filters are not tunable: it should indeed be possible to easily modify the length of the resonators which is of course not the case.
  • the object of the present invention as claimed is to provide filters with linear resonators open at their two ends, such as U-shaped resonators, of dimensions significantly smaller than those of conventional filters of the same type, which can be easily tunable, and whose the parasitic bandwidth is further from the central frequency of the filter than in the case of filters of this type previously known.
  • each of the resonators is length less than the half wavelength which corresponds to the central frequency of the band to be filtered, and in that each of said resonators further comprises a capacitor connected between its two open ends, the value of the capacitance of said capacitor being that which gives, for the resonant circuit which it constitutes with the associated resonator, a resonant frequency equal to said central frequency of the band to be filtered.
  • FIG. 3 is the representation of a filter according to the invention; this filter, like the filter according to FIG. 1, was calculated to present a passband of 55 MHz centered on 825 MHz.
  • This filter is produced on an alumina wafer, 1, twice an inch, ie 2.54 x 2.54 cm having a thickness of 1.27 mm; a graduated scale of 0 to 1 cm, placed next to the plate, gives the enlargement ratio of the drawing.
  • the filter according to FIG. 3 comprises a ground plane here consisting of a gold deposit 10 ⁇ m thick and which completely covers all of that of the two faces of the plate which is not not visible in the drawing; on the face of the wafer 1 visible in the drawing, two lines L ′ 1 , L ′ z parallel to each other and, between these lines, five U-shaped resonators are produced by a deposit of gold 10 ⁇ thick, H ' 1 to H' s whose vertical bars are parallel to the lines L ' i , L' z . Between two points located, in the case of FIG.
  • variable capacitors Ci to C 5 , associated respectively with the resonators H ' 1 to H ' 5 ;
  • these variable capacitors symbolically represented by two parallel bars crossed by an arrow, are miniature commercial capacitors whose capacity can be adjusted between 0.3 and 1.2 picofarads.
  • the length of the U-shaped resonators of FIG. 3 is 40 mm, which, for a half-wavelength having this value in alumina, corresponds to a frequency of 1450 MHz; but, as shown in FIG. 4, with the filter according to FIG. 3, the passband is no longer centered on a frequency whose corresponding half-wavelength is equal to the length of the U-shaped resonators.
  • FIG. 4 is a graph which represents, with the same scales on the abscissa and on the ordinate as in FIG. 2, the attenuation as a function of the frequency produced by the filter according to FIG. 3.
  • This graph shows that the filter of FIG. 3 has a bandwidth centered on 825 MHz, almost identical to that of the filter according to FIG. 1.
  • FIG. 5 shows a resonator, H, with the associated capacitor, C, obtained in the manner indicated above.
  • the capacitor C consists of a row of parallel tongues, arranged between the branches of the U of the resonator H. perpendicular to its branches; two successive tongues are respectively integral with the two branches of the U.
  • FIG. 6 represents a notch filter which comprises a single access line, L, the two ends of which constitute the inlet and the outlet of the filter respectively.
  • Three U-shaped resonators, H 01 , H 02 , H 03 are arranged in the same plane as line L, with their branches parallel to line L and are placed on either side of this line.
  • Variable capacitors C ′ i , C ′ 2 , C ′ 3 make it possible to obtain the same advantages as in the case of FIG. 3 but in a transposition to the strip cut function.
  • the coupling between the access line or lines and the resonators can be done by an electrical connection between one of the resonators and the line considered.
  • an access line, or both may be perpendicular to the bars of the U-shaped resonators and terminate in an electrical connection to the resonator; this is how, for example, in FIG. 3, the line L ′ can be replaced by a connection starting from the left edge of the plate and ending at a point on the left bar of the resonator H ' 1 ′ this dependent point by the neck input range to be achieved.
  • filters of which the lines, the resonators and possibly the capacitors consist of metallic deposits on a substrate

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)
EP82401307A 1981-07-24 1982-07-09 Filtre hyperfréquence de petites dimensions à résonateurs linéaires Expired EP0071508B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8114425A FR2510325B1 (fr) 1981-07-24 1981-07-24 Filtre hyperfrequence de petites dimensions, a resonateurs lineaires
FR8114425 1981-07-24

Publications (2)

Publication Number Publication Date
EP0071508A1 EP0071508A1 (fr) 1983-02-09
EP0071508B1 true EP0071508B1 (fr) 1987-01-21

Family

ID=9260841

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82401307A Expired EP0071508B1 (fr) 1981-07-24 1982-07-09 Filtre hyperfréquence de petites dimensions à résonateurs linéaires

Country Status (4)

Country Link
EP (1) EP0071508B1 (enrdf_load_stackoverflow)
JP (1) JPS5816901U (enrdf_load_stackoverflow)
DE (1) DE3275253D1 (enrdf_load_stackoverflow)
FR (1) FR2510325B1 (enrdf_load_stackoverflow)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2510326A1 (fr) * 1981-07-24 1983-01-28 Thomson Csf Filtre passe-bande a resonateurs lineaires ouverts a leurs deux extremites
FR2540294B1 (fr) * 1983-01-31 1985-10-04 Thomson Csf Filtre hyperfrequence a resonateurs lineaires
FR2565438B1 (fr) * 1984-05-30 1989-09-22 Cepe Filtre dielectrique a frequence centrale variable.
GB2164804B (en) * 1984-09-17 1989-03-15 Stc Plc Filters for transmission systems
FR2578104B1 (fr) * 1985-02-27 1987-03-20 Alcatel Thomson Faisceaux Filtre passe-bande pour hyperfrequences
FR2613538A1 (fr) * 1987-03-31 1988-10-07 Thomson Csf Filtre hyperfrequence
FR2626716B1 (fr) * 1988-01-29 1990-04-20 France Etat Filtre a resonateurs plans
JP2718984B2 (ja) * 1989-03-20 1998-02-25 松下電器産業株式会社 共振器及びその共振器を用いたフィルタ
US7231238B2 (en) 1989-01-13 2007-06-12 Superconductor Technologies, Inc. High temperature spiral snake superconducting resonator having wider runs with higher current density
FR2659509B1 (fr) * 1990-03-09 1994-07-29 Tekelec Airtronic Sa Resonateur dielectrique a rubans metalliques micro-ondes et dispositif utilisant un tel resonateur.
FI112980B (fi) * 1996-04-26 2004-02-13 Filtronic Lk Oy Integroitu suodatinrakenne
US6313719B1 (en) * 2000-03-09 2001-11-06 Avaya Technology Corp. Method of tuning a planar filter with additional coupling created by bent resonator elements
RU2662058C1 (ru) * 2017-06-26 2018-07-23 Российская Федерация, от имени которой выступает Министерство обороны Российской Федерации СВЧ-фильтр нижних частот

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1074092B (de) * 1955-12-28 1960-01-28 Siemens & Halske Aktiengesellschaft, Berlin und München Verzögerungsleitung mit Filtercharakteristik für Wanderfeldröhren
US3094664A (en) * 1961-11-09 1963-06-18 Bell Telephone Labor Inc Solid state diode surface wave traveling wave amplifier
US3171086A (en) * 1962-09-10 1965-02-23 Horst W A Gerlach Traveling wave amplifier and oscillator with tunnel diodes
US3400298A (en) * 1965-12-01 1968-09-03 Raytheon Co Solid state integrated periodic structure for microwave devices
US3534301A (en) * 1967-06-12 1970-10-13 Bell Telephone Labor Inc Temperature compensated integrated circuit type narrowband stripline filter
US3530411A (en) * 1969-02-10 1970-09-22 Bunker Ramo High frequency electronic circuit structure employing planar transmission lines
US3754198A (en) * 1972-03-20 1973-08-21 Itt Microstrip filter
US3927347A (en) * 1974-03-22 1975-12-16 Varian Associates Microwave tube using electronically tunable cavity resonator
JPS52104034A (en) * 1976-02-26 1977-09-01 Matsushita Electric Ind Co Ltd Electronic tuning circuit

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
"Microwave Filter of coupled Lines and Lumped Capacitances", reprinted from the IEEE transaction on Microwave Theory and Techniques, Vol. MTT-18, pages 278 a 280, (mai 1970) *

Also Published As

Publication number Publication date
FR2510325A1 (fr) 1983-01-28
DE3275253D1 (en) 1987-02-26
FR2510325B1 (fr) 1987-09-04
JPS5816901U (ja) 1983-02-02
JPS6329282Y2 (enrdf_load_stackoverflow) 1988-08-08
EP0071508A1 (fr) 1983-02-09

Similar Documents

Publication Publication Date Title
EP0071508B1 (fr) Filtre hyperfréquence de petites dimensions à résonateurs linéaires
EP0117178B1 (fr) Filtre hyperfréquence à résonateurs linéaires
EP0047203B1 (fr) Filtre hyperfréquence à résonateur diélectrique, accordable dans une grande largeur de bande
EP0193162B1 (fr) Filtre passe-bande pour hyperfréquences
FR2569496A1 (fr) Filtre dielectrique
FR2484735A1 (fr) Resonateur a ondes acoustiques de surface
EP0014115B1 (fr) Oscillateur accordable hyperfréquence à ondes magnétostatiques
EP0285503A1 (fr) Filtre comportant des éléments à constantes réparties associant deux types de couplage
EP0071509B1 (fr) Filtre passe-bande à résonateurs linéaires ouverts à leurs deux extrémités
EP0108003B1 (fr) Résonateurs bi-rubans et filtres réalisés à partir de ces résonateurs (11111)
EP0165158A1 (fr) Filtre diélectrique à fréquence centrale variable
WO2023047042A1 (fr) Filtre a ondes elastiques de surface et a cavites resonantes
FR2927743A1 (fr) Circuit de filtrage comportant des resonateurs acoustiques couples
FR2542929A1 (fr) Circuit resonant pour l'extraction d'oscillations a frequence d'horloge
WO2016083747A1 (fr) Dispositif de filtrage et ensemble filtrant a structure de bandes electriquement conductrices
EP0424255B1 (fr) Cellule de filtrage et filtre correspondant
EP4089452B1 (fr) Système de conversion électro-optique
EP0075498B1 (fr) Filtre à cavités, présentant un couplage entre cavités non adjacentes
EP0141704B1 (fr) Filtre miniature hyperfréquence à résonateurs, constitués par des circuits bouchons, couplés par des condensateurs
EP0649571B1 (fr) Filtre passe-bande a resonateurs couples
EP0373028B1 (fr) Filtre passif passe-bande
EP0326498B1 (fr) Circuit résonnant et filtre utilisant ce circuit
FR2613538A1 (fr) Filtre hyperfrequence
FR2525835A1 (fr) Filtre passe-bande a resonateurs lineaires, auquel est associee une fonction coupe-bande
EP0337825B1 (fr) Filtre coupe-bande hyperfréquence en technologie micro-bande

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

Designated state(s): CH DE GB IT LI NL SE

17P Request for examination filed

Effective date: 19830620

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): CH DE GB IT LI NL SE

REF Corresponds to:

Ref document number: 3275253

Country of ref document: DE

Date of ref document: 19870226

ITF It: translation for a ep patent filed
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: DE

Payment date: 19930519

Year of fee payment: 12

Ref country code: CH

Payment date: 19930519

Year of fee payment: 12

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

Ref country code: SE

Payment date: 19930521

Year of fee payment: 12

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

Ref country code: GB

Payment date: 19930526

Year of fee payment: 12

ITTA It: last paid annual fee
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 19930731

Year of fee payment: 12

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

Ref country code: GB

Effective date: 19940709

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

Ref country code: SE

Effective date: 19940710

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

Ref country code: LI

Effective date: 19940731

Ref country code: CH

Effective date: 19940731

EUG Se: european patent has lapsed

Ref document number: 82401307.2

Effective date: 19950210

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

Ref country code: NL

Effective date: 19950201

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

Effective date: 19940709

NLV4 Nl: lapsed or anulled due to non-payment of the annual fee
REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

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

Ref country code: DE

Effective date: 19950401

EUG Se: european patent has lapsed

Ref document number: 82401307.2