EP0108003B1 - Doppelstreifen-Resonator und nach dieser Art gestaltetes Filter - Google Patents

Doppelstreifen-Resonator und nach dieser Art gestaltetes Filter Download PDF

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Publication number
EP0108003B1
EP0108003B1 EP83402026A EP83402026A EP0108003B1 EP 0108003 B1 EP0108003 B1 EP 0108003B1 EP 83402026 A EP83402026 A EP 83402026A EP 83402026 A EP83402026 A EP 83402026A EP 0108003 B1 EP0108003 B1 EP 0108003B1
Authority
EP
European Patent Office
Prior art keywords
resonators
filter
substrate
dielectric
mhz
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
EP83402026A
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English (en)
French (fr)
Other versions
EP0108003A1 (de
Inventor
Jean-Claude Mage
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
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Publication date
Application filed by Thomson CSF SA filed Critical Thomson CSF SA
Publication of EP0108003A1 publication Critical patent/EP0108003A1/de
Application granted granted Critical
Publication of EP0108003B1 publication Critical patent/EP0108003B1/de
Expired legal-status Critical Current

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    • 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
    • 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
    • H01P1/207—Hollow waveguide filters
    • H01P1/208—Cascaded cavities; Cascaded resonators inside a hollow waveguide structure
    • 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
    • H01P7/084—Triplate line resonators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P7/00—Resonators of the waveguide type
    • H01P7/10—Dielectric resonators

Definitions

  • the present invention relates to a high frequency filter made from electromagnetic resonators which can be called "two-band resonators”.
  • the resonators and filters produced from these elements are often made up of line sections. These can be air coaxial lines or coaxial lines loaded with dielectric as mentioned in the article: "Bandpass filter with dielectric materials used for broadcasting channel filter” by K. Wakino and Y. Konishi published in the review I.E.E.E. Transactions on Broadcasting, vol. BC-26, No. 1, March 1980. It is also known to manufacture resonators and filters from microstrip lines as indicated in the article: "750 MHz microstrip bandpass filter on barium tetratitanate substrate" by G. Ohm and G. Schmoller published in Electronics Letters, vol. 18, No. 15 of July 22, 1982, as also described in GL Matthaei's "Microwave filters impedance-matching networks and coupling structures", pages 422-425 and 770 of 1964 published by McGraw-Hill Book Company , New-York USA.
  • the coaxial line technique allows the manufacture of independent resonators whose natural frequencies can be adjusted before their assembly to form filters.
  • This assembly can be carried out in the case of a bandpass filter by placing the various resonators end to end, the couplings between two sections of consecutive lines being determined by the distances which separate their faces placed opposite.
  • overvoltage coefficients greater than 500
  • a silver-plated 20 mm diameter resonator can have an overvoltage coefficient Q greater than 1000 for a frequency of 1 GHz.
  • the coupling of quarter-wave resonators remains delicate and the very realization of the coaxial structure is quite complex because of the different operations of machining and metallization of elements with circular section.
  • Resonators can be designed by metallizing two opposite faces of a substrate as described in the article by J. Watkins “Radiation Loss from Open-Circuited Dielectric Resonators” published in IEEE Transactions on Microwave Theory and Techniques, October 1973, pages 636-639, or according to the technique of microstrip lines. They are generally produced from a relatively large dielectric substrate, one face of which is entirely metallized and the other of which receives a metallic conductor in the form of a thin strip. This technique has two drawbacks.
  • the inherent overvoltage coefficients Q of the resonators are always low (less than 500) and consequently the performance of filters formed from these resonators is always modest (high insertion losses, greater than 3 dB towards 1 GHz).
  • the filter once the filter has been produced, by depositing ribbons on the same substrate, it is practically impossible to adjust the natural frequencies of the resonators as well as their mutual couplings. This prohibits the industrial production of filters comprising a high number of poles due to the inevitable dispersions of the characteristics: in particular, the dielectric constant of the substrate.
  • the invention relates to filters comprising resonators produced from a parallelepiped made of dielectric material.
  • a line is produced by metallizing two opposite faces of the parallelepiped and a resonator ⁇ / 4 or ⁇ / 2 depending on the length and termination of the line.
  • FIG. 1 shows a waveguide called microstrip line (microstrip line in English).
  • This line is formed by a flat dielectric substrate 1 covered on its underside with a metallization 2.
  • the opposite face of the substrate receives a conductive tape 3.
  • This solid can be a parallelepiped.
  • Metallizations 5 and 6 cover two opposite faces of the dielectric.
  • the bi-ribbon line has two similar electrodes.
  • Half-wave resonators can be present as shown in FIG. 2, that is to say in open circuit, with They can also be of the type shown in Figure 3.
  • FIG. 2 we see in this figure a dual-ribbon waveguide formed by a dielectric bar 7 covered on two of its faces with metallic deposits 8 and 9. Boundary conditions: metallizations ends 10 and 11 make it a ⁇ g / 2 resonator for
  • a ⁇ g / 4 resonator is shown in FIG. 4. It is formed by a bi-ribbon line defined by a dielectric bar 12, metallizations 13 and 14 and a short circuit 15 caused by the metallization of one of the ends. from the bar. Its length L is equal to ⁇ g / 4.
  • an appropriate dielectric In order to have temperature stable resonators, it is advantageous to choose an appropriate dielectric.
  • a material such as those which were the subject of the patent of the Applicant No. 80.04 601 filed on February 29, 1980. These materials have relative molar proportions t Ti0 2 , x Sn0 2 , y Zr0 2 , a NiO, b La 2 0 3 and c Fe where the parameters t, x, y, a, b and c satisfy the following inequalities:
  • resonators are typically intended for the production of band-pass and band-cut filters in the UHF range. They can also be used to stabilize oscillators. Examples of filters in the vicinity of 1 GHz are presented below. They can be easily transposed to other frequencies and can be made indifferently using ⁇ g / 2 or ⁇ g / 4 resonators.
  • Figure 5 is a top view of the housing from which the cover has been removed. A cut was made at the holes 25 and 26 for input and output of the signal. The hole 25 allows the passage of a conductor 27 which forms a coupling loop 29, serving as excitation means, with the resonator 20. The end of the conductor 27 is then connected to the housing.
  • the device allowing the output of the signal is similarly constituted by a conductor 28 which forms a loop 30, which serves as collecting means, at the level of the resonator 23 and the end of which is connected to ground.
  • the bottom of the housing is covered with an insulating substrate 31 which has, for example, a very low dielectric constant.
  • the resonators are fixed to the substrate 31, for example by gluing.
  • the metallizations of the quarter wave resonators are respectively mutually parallel and perpendicular to the substrate as shown in FIG. 5.
  • the coupling between resonators is made by mutual inductance.
  • the natural frequencies of each resonator have been previously adjusted either by manufacturing or by running in. The development of the filter is then greatly facilitated.
  • the resonators can also be separated by spacers made of dielectric material of low dielectric constant. The distances between each resonator can be of the order of edge a.
  • FIG. 8 shows such a filter.
  • the housing was cut as in FIG. 5.
  • the housing 50 is recognized on which a cover, not shown, is fixed.
  • the bottom of the housing is covered with a substrate 51 of dielectric material of low dielectric constant.
  • the filter includes 3 quarter-wave resonators 52, 53 and 54, holes 55 and 56 which allow the passage of a signal input conductor 57 and an output conductor 58, a line 59 which can be l soul of a coaxial line.
  • the housing and its cover are connected to the ground.
  • the distances separating the resonators from each other and between the line 59 are of the order of magnitude of the edge a. It is also possible to obtain with this kind of filters an adjustment of the couplings by the presence of screws modifying the electromagnetic field between the resonators.
  • the band-cut and band-pass filters produced using quarter-wave resonators exhibit a first spurious response at a frequency substantially triple their operating frequency.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)
  • Waveguides (AREA)

Claims (3)

1. Hochfrequenzfilter,
- mit einem Gehäuse (24), dessen Boden mit einem isolierenden Substrat (31) bedeckt ist,
- mit mindestens einem auf dem Substrat befestigten Resonator, der einen dielektrischen Körper mit sechs Seiten enthält, dadurch gekennzeichnet, daß höchstens vier der Seiten mit einer Metallschicht bedeckt sind und zwei weitere nicht mit einer Metallschicht bedeckten Seiten einander gegenüberliegen, wobei die mit einer Metallschicht bedeckten Seiten senkrecht zur Ebene des Substrats liegen.
2. Hochfrequenzfilter nach Anspruch 1, dadurch gekennzeichnet, daß die Resonatoren (20, 21, 22 und 23) zwischen Anregungsmitteln (29) und Kollektormitteln (30) angeordnet sind, die die Eingangs- und Ausgangsklemmen des Filters bilden, so daß die einfallende elektromagnetische Energie nacheinander von den Resonatoren gefiltert wird und die Gesamtheit dieser Resonatoren ein Bandpaßfilter darstellt.
3. Hochfrequenzfilter nach Anspruch 1, dadurch gekennzeichnet, daß die Resonatoren (52, 53 und 54) so angeordnet sind, daß elektromagnetische Energie aus der Energie entnommen wird, die auf einer die Eingangs- und Ausgangsklemmen des Filters verbindenden Fortpflanzungsstrecke (59) übertragen wird, wobei die Gesamtheit dieser Resonatoren ein Bandsperrfilter darstellt.
EP83402026A 1982-10-29 1983-10-18 Doppelstreifen-Resonator und nach dieser Art gestaltetes Filter Expired EP0108003B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8218236A FR2535547B1 (fr) 1982-10-29 1982-10-29 Resonateurs bi-rubans et filtres realises a partir de ces resonateurs
FR8218236 1982-10-29

Publications (2)

Publication Number Publication Date
EP0108003A1 EP0108003A1 (de) 1984-05-09
EP0108003B1 true EP0108003B1 (de) 1988-05-11

Family

ID=9278766

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83402026A Expired EP0108003B1 (de) 1982-10-29 1983-10-18 Doppelstreifen-Resonator und nach dieser Art gestaltetes Filter

Country Status (5)

Country Link
US (1) US4603311A (de)
EP (1) EP0108003B1 (de)
JP (1) JPS59107603A (de)
DE (1) DE3376600D1 (de)
FR (1) FR2535547B1 (de)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4524318A (en) * 1984-05-25 1985-06-18 Burr-Brown Corporation Band gap voltage reference circuit
FR2565438B1 (fr) * 1984-05-30 1989-09-22 Cepe Filtre dielectrique a frequence centrale variable.
DE3570156D1 (en) * 1984-12-06 1989-06-15 Thomson Csf Electromagnetic resonators and filters comprising such resonators
US4751481A (en) * 1986-12-29 1988-06-14 Motorola, Inc. Molded resonator
US4908589A (en) * 1987-09-21 1990-03-13 Hughes Aircraft Company Dielectrically loaded waveguide switch
DE69122748T2 (de) * 1990-12-26 1997-05-07 Tdk Corp Hochfrequenzvorrichtung
FI88440C (fi) * 1991-06-25 1993-05-10 Lk Products Oy Keramiskt filter
US5290740A (en) * 1991-11-06 1994-03-01 Ngk Insulators, Ltd. Dielectric ceramic composition used for producing dielectric resonator or filter for microwave application
FR2685490B1 (fr) * 1991-12-19 1996-05-15 Commissariat Energie Atomique Dispositif de mesure de parametres dielectriques et magnetiques de materiaux et systeme de mesure desdits parametres utilisant ce dispositif.
FI95515C (fi) * 1993-11-01 1996-02-12 Solitra Oy Keskitetyn piirivakion resonaattorirakenne ja menetelmä keskitetyn piirivakion resonaattorirakenteen säätämiseksi
WO1995027318A1 (en) * 1994-03-31 1995-10-12 Nihon Dengyo Kosaku Co., Ltd. Resonator and filter using it
AU2868899A (en) * 1998-02-17 1999-08-30 Itron Inc. Laser tunable thick film microwave resonator for printed circuit boards
FR2847747B1 (fr) * 2002-11-22 2005-02-18 Thales Sa Convertisseur analogique/numerique pour hyperfrequences
CN104037484A (zh) * 2013-03-08 2014-09-10 中兴通讯股份有限公司 介质谐振器及介质滤波器
US10522889B2 (en) * 2018-04-09 2019-12-31 United States Of America As Represented By Secretary Of The Navy Tunable passive enhance Q microwave notch filter

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2774046A (en) * 1952-05-08 1956-12-11 Itt Microwave transmission line
US2820206A (en) * 1952-05-08 1958-01-14 Itt Microwave filters
US2838736A (en) * 1953-03-20 1958-06-10 Erie Resistor Corp High dielectric constant cavity resonator
US3327255A (en) * 1963-03-06 1967-06-20 Bolljahn Harriette Interdigital band-pass filters
US3673509A (en) * 1970-08-07 1972-06-27 Robert B Cooper Jr Interdigital preamplifier
US4179673A (en) * 1977-02-14 1979-12-18 Murata Manufacturing Co., Ltd. Interdigital filter
FR2496995A1 (fr) * 1980-11-07 1982-06-25 Thomson Csf Filtre a elimination de bande accordable mecaniquement et circuit comportant un tel filtre

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
ELECTRONICS LETTERS, vol. 18, no. 15, 22 juillet 1982, pages 661-663, Hitchin, GB., G. OHM et al.: "750 MHz microstrip bandpass filter on barium tetratitanate substrate" *

Also Published As

Publication number Publication date
FR2535547A1 (fr) 1984-05-04
FR2535547B1 (fr) 1988-09-16
JPS59107603A (ja) 1984-06-21
EP0108003A1 (de) 1984-05-09
DE3376600D1 (en) 1988-06-16
US4603311A (en) 1986-07-29

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