EP0060174B1 - Filtre passe-bande à résonateurs diélectriques - Google Patents

Filtre passe-bande à résonateurs diélectriques Download PDF

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Publication number
EP0060174B1
EP0060174B1 EP82400316A EP82400316A EP0060174B1 EP 0060174 B1 EP0060174 B1 EP 0060174B1 EP 82400316 A EP82400316 A EP 82400316A EP 82400316 A EP82400316 A EP 82400316A EP 0060174 B1 EP0060174 B1 EP 0060174B1
Authority
EP
European Patent Office
Prior art keywords
resonators
guide
mode
pass band
disposed
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
EP82400316A
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German (de)
English (en)
French (fr)
Other versions
EP0060174A1 (fr
Inventor
Jacques Delaballe
Jean Fouillet
Alexandre Osias
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
Priority to AT82400316T priority Critical patent/ATE13956T1/de
Publication of EP0060174A1 publication Critical patent/EP0060174A1/fr
Application granted granted Critical
Publication of EP0060174B1 publication Critical patent/EP0060174B1/fr
Expired 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
    • H01P7/00—Resonators of the waveguide type
    • H01P7/10—Dielectric resonators
    • 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
    • H01P1/219—Evanescent mode filters

Definitions

  • the present invention relates to a bandpass filter with dielectric resonators, comprising a waveguide operating below its cutoff frequency, an input antenna and an output antenna respectively disposed at the two ends of the guide and n resonators (n positive integer) arranged in series inside the guide.
  • Filters of this type which operate by direct coupling of the dielectric resonators with the input and output coupling elements. This direct coupling is done by. fields radiated by dielectric resonators.
  • the no-load overvoltage coefficients of these filters do not exceed 4,000 due to the TE 011 resonance mode used for the resonators, the latter not having a very high overvoltage coefficient (for example 6,000 to 5 GHz), and in this is because, in order to obtain the important coupling necessary for the functioning of the filter, the coupling element (antenna or loop) must be very close to the resonator and thus deteriorates the coefficient of overvoltage.
  • the TE o11 mode is used in these known filters because it is easily excitable by using antennas or loops; the height and width of the waveguide are taken on the order of three times greater than, respectively, the height and the diameter of the resonators.
  • bandpass filters with dielectric resonators which operate in evanescent mode; in these filters the coupling between resonators is carried out by means of the fields of a waveguide operating below its cut-off frequency while the coupling of the extreme resonators with the input and output coupling elements, they are neighbors is done as in the previous case, that is to say that the input and output coupling elements are directly placed in the field lines of the resonators. But again, the overvoltage coefficients do not exceed 4,000.
  • the object of the present invention is to produce filters with dielectric resonators, having a significantly higher overvoltage coefficient than that of known dielectric resonator filters.
  • a filter of the type described at the beginning of this text is mainly characterized in that, so as to make the resonators resonate according to the mode TM 011 and to propagate in the guide a mode TM whose cut-off frequency is higher to that of TM 011 mode of the resonators, the dimensions of the cross section of the guide are of the order of 2.5 times the transverse dimensions of the resonators, the resonators are arranged substantially along the longitudinal axis of the guide and the antennas are arranged in the direction of propagation in the guide.
  • the resonant frequency of the resonators must be lower than the cutoff frequency of the lowest propagation mode excited in the guide.
  • the principle is to avoid exciting a TE mode of the guide in order to excite only a TM type mode, which entails the use, as coupling elements, of antennas oriented along the direction of propagation in the guide. .
  • the width and the height of the section of the guide will be taken in the order of 2.5 times respectively the diameter and the height of the resonators, it being understood that 'acts there of an average value and if, for example, the height of the guide is only twice greater than the height of the resonator, on the other hand its width will be taken of the order of three times greater than the diameter of the resonator.
  • the configuration of the field lines of the guided mode TM 11 makes it possible to excite the mode TM 011 in the first resonator; or to excite the TM " mode in the guide it is necessary that the input antenna is arranged along the longitudinal axis of the guide because this is where the electric field is maximum in TM 11 mode; on the other hand the input antenna can be placed relatively far from the first resonator so as not to disturb it while being effectively coupled to it by the field lines.
  • a resonator resonating according to the TM 011 mode is comparable to an electric dipole; or an electric dipole placed in a waveguide excites all the modes of the waveguide which have an electric field component parallel to the direction of the dipole therefore in particular the TM " mode, which allows the transmission of energy from one resonator to the other via the fields of this mode.
  • Figure 1 shows the filter seen from above, cover removed and Figure 2 shows this filter, cover put back, seen in a section through a plane perpendicular to the plane of Figure 1 and passing through a line XX of Figure 1.
  • Figure 2 shows that the filter is formed by an associated waveguide 1, to form a housing, with two plates, 2 and 3, integral with its ends.
  • the cover which has been discussed above is a cover, 10, which appears in FIG. 2, it consists of one of the sides of the waveguide.
  • This waveguide is a square section waveguide 30 mm side, and has a length of 206 mm.
  • FIGS. 1 and 2 show the longitudinal axis XX of the waveguide, that is to say the axis passing through the point of intersection of the diagonals of the sections of the guide.
  • Two antennas A e , A s respectively secured to the plates 2 and 3 by means of connection sockets 20, 30 which isolate them from the plates, are arranged along the axis XX, that is to say in the direction wave propagation in the guide.
  • connection sockets 20, 30 which isolate them from the plates
  • These four supports are crown supports made of a dielectric material with low permittivity; they rest on the face of the waveguide opposite to the cover 10.
  • This arrangement of the antennas A e A s and of the resonators R 1 , R 2 , R 3 , R 4 as indicated in the above, allows that the coupling of the antenna A e with the resonator R 1 ′ of the successive resonators together and of the resonator R 4 with the output antenna A s , is done by means of the field lines of the guided mode TM " .
  • tuning screws V 1 to V s are provided; these tuning passes through the cover 10, substantially midway between the input antenna A e and the resonator R , between the resonators R, and R 2 , R 2 and R 3 , R 3 and R 4 and between the resonator R 4 and the output antenna A s .
  • the filter which has just been described is a flat filter, with four poles, designed to operate at an average frequency of 4.9 GHz and having an overvoltage coefficient Q o of 7000 to 4.9 GHz.
  • FIGs 3 and 4 correspond to another embodiment of the filter according to the invention.
  • the filter tuning device according to Figures 1 and 2 consisting of tuning screws (V 1 to V 5 , Figure 2), is removed and the filter is magnetically tunable.
  • the waveguide still works below its cutoff frequency
  • the antennas and the resonators are arranged as in the case of the figure and the dimensions of the cross section of the guide are still around 2.5 times the transverse dimensions of the resonators; there too, the resonators resonate according to the TM 011 mode and the propagation in the guide is done according to a TM mode whose cut-off frequency is higher than that of the TM 011 mode, in this case it will mainly be the TM 11 mode. .
  • Figure 3 shows a rectangular guide section 1 made of brass; this guide section has an internal section of 30 mm for its long side and 20 mm for its short side.
  • Two metal plates 2, 3, also made of brass, close the guide section respectively at its two ends; these metal plates are each pierced with a hole traversed by a connection socket 20, 30 the central part of which is constituted by a linear metallic conductor which extends inside the guide section over a length of approximately 6 mm to constitute an antenna of the electric dipole type, A e , A s .
  • the intermediate element 12 produces an offset, upwards in the frequency domain, of the operating band of the filter and this offset is all the greater the greater its thickness.
  • This element therefore allows, by a suitable choice of its thickness, to adjust, during manufacture, the position of the operating frequency band of the filter while using for this filter the same dielectric resonators and the same ferrimagnetic elements as for other filters with slightly different operating bands.
  • the parts S, -11-12-13, constituting the resonant member R 1 ⁇ S 1 are assembled by gluing.
  • the resonant members R 2 -S 2 and R 3 S 3 are identical, from a constitutional point of view, to the resonant member R 1 ⁇ S 1 .
  • the resonant members R, -S 2 , R 2 -S 2 , R 3 -S 3 are respectively subjected to magnetic fields H 1, H 3, H 3 produced by electromagnets outside the guide section; these fields are separately adjustable the electromagnet which produces the field H1 to which the resonant member R 1 -S is subjected, will appear in FIG. 4.
  • the frequency matching of the filter according to FIG. 3 is possible thanks to the ferrimagnetic elements, such as 13, of the resonant members.
  • This agreement is obtained by modifying, separately for each resonant member, the value of the magnetic field to which each resonant member is subjected, that is to say by modifying the value of the excitation current of the electromagnet producing this field. magnetic.
  • This variation in the resonant frequency of the filter is mainly linked to the nature and geometry of the dielectric resonator and of the ferrimagnetic element of the resonant members R 1 ⁇ S 1 , R 2 ⁇ S 2 , R 3 ⁇ S 3 .
  • the central frequency of the filter can vary from 4.8 GHz to 5.5 GHz, i.e. a relative variation of almost 15%.
  • FIG. 4 is another view of the filter already partially shown in Figure 3.
  • Figure 4 shows the guide section 1 seen at the end; the plate 2 and the connection socket 20 have been removed so as to make it possible to see the resonant member R, -S, placed inside the guide section.
  • an electromagnet L1 is the one which produces the magnetic field H1 which was discussed during the description of FIG. 3.
  • This electromagnet L1 comprises a U-shaped part, 5, made of extra soft iron (in the example described, this iron is of the type known as iron from Sweden); the ends of the U are respectively pierced by two three threads through which two adjustment screws 50 and 51 pass, also made of extra soft iron; these adjustment screws make it possible to modify the spacing between the two poles of the electromagnet.
  • a coil 52 is wound around the U-shaped part and has its conductor which is extended at its two ends by, respectively, two connecting wires 53 and 54; the winding 52 is supplied by a variable current source 4. As has been said above, the variation in current from the source 4 makes it possible to vary the magnetic field supplied by the electromagnet from 0 to 1500 gauss.
  • the invention is not limited to the embodiments described, thus it is possible to use cylindrical guides with resonators operating according to the TM 011 mode; in this case so that the operating mode of the guide is, as with the rectangular guides, a TM mode whose cut-off frequency is higher than that of the TM 011 mode of the resonators, it is necessary to take the TM 01 mode which leads to the same considerations, with regard to dimensions and arrangement of elements, only with rectangular guides.
  • the intermediate elements such as 12 ( Figures 3 and 4) can be deleted.
  • the ferrimagnetic elements are then directly in contact with the dielectric resonators and the adjustment of the position of the operating frequency band of the filter must then be done by modifying the dielectric resonator or the ferrimagnetic element, or both at the same time; in practice, such modifications are more troublesome than those which consist in changing the thickness of the disc in dielectric material with low losses, constituting the intermediate element.

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EP82400316A 1981-02-27 1982-02-23 Filtre passe-bande à résonateurs diélectriques Expired EP0060174B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82400316T ATE13956T1 (de) 1981-02-27 1982-02-23 Bandpassfilter mit dielektrischen resonatoren.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8103987A FR2509537A1 (fr) 1981-02-27 1981-02-27 Filtre passe-bande a resonateurs dielectriques
FR8103987 1981-02-27

Publications (2)

Publication Number Publication Date
EP0060174A1 EP0060174A1 (fr) 1982-09-15
EP0060174B1 true EP0060174B1 (fr) 1985-06-19

Family

ID=9255713

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82400316A Expired EP0060174B1 (fr) 1981-02-27 1982-02-23 Filtre passe-bande à résonateurs diélectriques

Country Status (4)

Country Link
EP (1) EP0060174B1 (enrdf_load_stackoverflow)
AT (1) ATE13956T1 (enrdf_load_stackoverflow)
DE (1) DE3264176D1 (enrdf_load_stackoverflow)
FR (1) FR2509537A1 (enrdf_load_stackoverflow)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2531815B1 (fr) * 1982-08-10 1985-08-02 Thomson Csf Filtre passe-bande a resonateurs dielectriques, presentant un couplage negatif entre resonateurs
FR2539565A1 (fr) * 1983-01-19 1984-07-20 Thomson Csf Filtre hyperfrequence accordable, a resonateurs dielectriques en mode tm010
JPS6221301A (ja) * 1985-07-22 1987-01-29 Nec Corp 誘電体共振器フイルタ
FR2610151A1 (fr) * 1987-01-28 1988-07-29 Alcatel Thomson Faisceaux Generateur d'ondes millimetriques a haute stabilite, agile en frequence
FR2694452B1 (fr) * 1992-07-30 1994-09-02 Alcatel Telspace Filtre passe-bande agile pour hyperfréquences.
DE4343940C2 (de) * 1993-12-22 1998-10-08 Siemens Ag Einrichtung zur Ankopplung bei dielektrischen Resonatoren
DE29511757U1 (de) * 1995-07-20 1995-09-28 Siemens Matsushita Components GmbH & Co. KG, 81541 München Dielektrischer Resonator
WO2004004063A1 (en) * 2002-06-28 2004-01-08 Telefonaktiebolaget L M Ericsson (Publ) Coupling arrangement
US9007150B2 (en) 2009-06-17 2015-04-14 Telefonaktiebolaget L M Ericsson (Publ) TM mode RF filter having dielectric rod resonators with cylindrical parts of different diameter

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2207845A (en) * 1938-05-28 1940-07-16 Rca Corp Propagation of waves in a wave guide
US2890422A (en) * 1953-01-26 1959-06-09 Allen Bradley Co Electrically resonant dielectric body
DE2538614C3 (de) * 1974-09-06 1979-08-02 Murata Manufacturing Co., Ltd., Nagaokakyo, Kyoto (Japan) Dielektrischer Resonator

Also Published As

Publication number Publication date
FR2509537B1 (enrdf_load_stackoverflow) 1983-11-04
DE3264176D1 (en) 1985-07-25
EP0060174A1 (fr) 1982-09-15
FR2509537A1 (fr) 1983-01-14
ATE13956T1 (de) 1985-07-15

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