EP0187579A1 - Elektromagnetische Resonatoren und Filter mit solchen Resonatoren - Google Patents

Elektromagnetische Resonatoren und Filter mit solchen Resonatoren Download PDF

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Publication number
EP0187579A1
EP0187579A1 EP85402432A EP85402432A EP0187579A1 EP 0187579 A1 EP0187579 A1 EP 0187579A1 EP 85402432 A EP85402432 A EP 85402432A EP 85402432 A EP85402432 A EP 85402432A EP 0187579 A1 EP0187579 A1 EP 0187579A1
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EP
European Patent Office
Prior art keywords
bar
resonator
resonator according
dielectric
electrodes
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EP85402432A
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English (en)
French (fr)
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EP0187579B1 (de
Inventor
Jean-Claude Mage
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Thales SA
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Thomson CSF SA
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Priority claimed from FR8418640A external-priority patent/FR2568414B1/fr
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    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P7/00—Resonators of the waveguide type
    • H01P7/02—Lecher 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 electromagnetic resonators as well as the high frequency filters produced from these resonators.
  • these resonators can be called biruban, bifilar, quadrilateral or quadrifilar resonators.
  • the resonators and filters produced from these elements often consist of line sections. It can be air coaxial lines or coaxial lines loaded with dielectrics 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 the article indicates: "750 MHz microstrip bandpass filter on barium tetratitanate substrate" by G. OHM and G. SCHMOLLER published in the magazine Electronics Letters, vol. 18, No. 15 of July 22, 1982.
  • 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 achieved 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 metallized 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 using the microstrip line technique. 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. On the one hand, 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). On the other hand, 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 proposes resonators which can be in different forms or configurations in order to offer a minimum bulk, whether they are used alone or in combination to form filters.
  • One of the solutions consists in modifying the geometry of the dielectrics in order to lower the resonant frequency without increasing the volume of the resonator.
  • Another solution is to judiciously reduce the width of the metallizations.
  • the subject of the invention is therefore a quarter wave electromagnetic resonator of the type comprising a dielectric bar of polygonal section delimiting at least six faces, the bar being disposed between at least two electrodes joined by a short circuit to one of their ends, characterized in that the electrodes and their short-circuit are part of a U-shaped armature, the electrodes only partially covering the faces of the bar which are adjacent to them.
  • the subject of the invention is also a quarter wave electromagnetic resonator of the type comprising a dielectric bar of polygonal section delimiting at least six faces, the bar being covered on two of its opposite faces with a metallization playing the role of electrodes, characterized in that the dielectric bar has, on the open circuit side, a reduced section with respect to the rest of the bar so as to reduce the distance separating the electrodes.
  • the subject of the invention is also a quarter wave electromagnetic resonator of the type comprising a dielectric bar of polygonal section delimiting at least six faces, the bar being covered on two of its opposite faces with a metallization acting as electrodes, characterized in that the dielectric bar has, on the short-circuit side, a reduced section relative to the rest of the bar so as to reduce the width of the metallization.
  • the invention also relates to a high frequency bandpass filter, characterized in that it comprises at least one resonator as defined above.
  • the object of the invention being to minimize the size of the resonators, these will be chosen of the quarter wave type.
  • FIG. 1 represents a quarter wave resonator according to known art and called biruban resonator. It consists of a solid dielectric 1 of parallelepiped shape and having a rectangular section of sides a and b. Metallizations 2 and 3 cover the two opposite faces of the parallelepiped which are separated by the distance a. The metallization 4 located at one end of the dielectric rod 1 constitutes a short circuit for the electrodes 2 and 3.
  • Figure 2 is a sectional view of such a filter with four resonators 10, 11, 12 and 13 disposed on an insulating substrate 14 which has a very low dielectric constant.
  • the resonators are fixed to the substrate by gluing.
  • the metallizations of the main faces (electrodes) of the resonators are mutually parallel and perpendicular to the substrate.
  • the coupling between resonators is done by mutual inductance.
  • the natural frequencies of each resonator have been previously adjusted either by manufacturing or by running in.
  • the assembly formed by the support 14 and the four resonators is placed in a housing 15 connected to ground and closed by a metal cover 22.
  • the hole 16 allows the passage of a conductor 18 which forms a coupling loop 20, serving as an exciter means, with the resonator 10.
  • the end of the conductor 18 is then connected to the housing.
  • the output signal is similarly picked up by the conductor 19 which forms a loop 21 which serves as collector means at the level of the resonator 13.
  • adjustment screws along axes 23, 24 and 25. These screws located between the resonators modify, according to their more or less great depression, the electromagnetic field which reigns between the resonators.
  • the filter shown in Figure 2 which also gives good results, has the disadvantage of occupying a large volume relative to the size of the resonators. Indeed, it is necessary to provide an insulating substrate 14 at the bottom of the housing, which is metallic for shielding purposes, in order to avoid short-circuiting the metallizations of the resonators. In addition, this substrate must have a sufficient thickness to prevent the metallic mass of the housing from influencing the setting and the overvoltage coefficient of the resonators. Likewise, the metal cover 22 must be located at a sufficient distance. We see that with these dimensional characteristics, the volume occupied by a filter can be significant relative to the volume of the resonators.
  • the resonators described above have three fully metallized faces which requires the presence of an insulating support to ensure their mounting in a housing.
  • the invention proposes to use metallized resonators on a band narrower than their own width.
  • Figure 3 shows such a resonator.
  • the resonator proper which bears the reference 30, consists of a dielectric bar 31, preferably having the shape of a rectangular parallelepiped, partially covered with a metallization 32 which provides electrical continuity on two main and opposite faces of the bar and the 'one end.
  • the conductive strip 32 has a constant width h 2 . It is located at a distance h l from one of the edges of the bar and at a distance h 3 from the other edge of the face considered.
  • a resonator such as that shown in Figure 3 can be fixed without risk of short circuit directly on a metal plane and even be inserted between two metal planes as shown in Figure 4.
  • the metal planes 33 and 34 can be respectively part of 'a housing and its cover.
  • the distances h l and h 3 should be sufficient so that the metallic masses 33 and 34 do not disturb the agreement which it is desired to obtain.
  • the arrangement in FIG. 4 promotes the dissipation of the dissipated heat and ensures better frequency stability of the resonator with respect to temperature variations and vibrations.
  • the overvoltage of the resonator in its housing then remains very close to the inherent overvoltage of the resonator.
  • the degradation of the overvoltage coefficient is less than 20% around 900 MHz for a copper or gold case.
  • FIG. 5 Another metallization arrangement is advantageous. This is the one shown in FIG. 5 where a resonator according to the invention is placed between two metal planes which can be part of the housing and of the cover of a filter.
  • the resonator 35 formed by the bar 36 and the metallization 37 is disposed on the metal plane 38.
  • the metal plane 39 is located at a distance h ' 3 from the resonator.
  • the value of the overvoltage coefficient Q depends on the quality of the metallization supported by the dielectric bar.
  • the formation of electrodes by metallization presents a delicate point which is the need to have a regular metallic layer in particular at the sharp angles formed by the junction of the electrodes and the end short-circuit.
  • the thickness of the metallization being relatively thin, the abrupt transition of a plane metallization to another which is perpendicular thereto can cause defects in the thickness of the deposit which has the consequence of varying the overvoltage coefficient from one resonator to another which theoretically is identical to it. It is possible to overcome this drawback by rounding off the angles which must be metallized.
  • Figure 6 is a side view of such a resonator.
  • the resonator 40 is formed by the dielectric bar 41 covered with a metallization 42 playing as previously the role of electrodes and short-circuit. Note in this figure that the angles 43 and 44 have been rounded which contributes to making the deposited layer uniform. For example, the radius of curvature of these rounding can be of the order of one tenth of the distance a.
  • FIG. 7 where the resonator 45 is formed by the dielectric bar 46 partially covered with a metallization 47.
  • the metallization can be made of silver or copper deposited by a conventional technique: sintered lacquer, evaporation, electrolysis ...
  • the recommended thickness is at least 30 ⁇ m for a resonance frequency of 1 GHz.
  • the two-wire electrodes can be produced by means of a metal frame which can be deposited as a layer as above, but which will preferably be added. The frame will then appear in the form of a jumper typically made of copper or silver or gold metal. The section of dielectric material can then be shortened. Typically, the length 1 of the section will be approximately half the length of the electrodes.
  • Figure 8 is an isometric view of a two-wire resonator according to the invention.
  • the resonator comprises a dielectric rod 50 having the shape of a rectangular parallelepiped of length 1 and of section a x b as shown in the figure.
  • the resonator also includes the jumper or armature 51 of length L which encloses the rod 50 by embedding and which constitutes both the two electrodes of the resonator and their short-circuit.
  • the jumper 51 can have different shapes, for example in the shape of a U as shown in FIG. 8.
  • the resonant frequency and the overvoltage coefficient Q are mainly determined by the length L of the electrodes, the distance between these electrodes and the nature of the dielectric.
  • the length 1 of the bar 50 can be reduced up to approximately x without appreciable alteration of the main characteristics of the resonator.
  • the first method leads to poor overvoltage coefficients and unstable resonance frequencies due to the thickness of the adhesive joint and the dielectric losses of the insulating adhesive.
  • the second method provides better performance because the joint is thinner and the dielectric losses of this kind of glue are weaker.
  • the sintered conductive adhesive of the third method ensures excellent contact and therefore good frequency stability. However, due to its poor conductivity, it is difficult to obtain a very low surface resistance and the overvoltage is degraded.
  • the size of the glue affects the value of the resonant frequency. If the glued area increases, the resonant frequency decreases. We can take advantage of this property and increase the conductive bonded surface taking into account the influences of the external metal parts (case, cover) to lower the resonant frequency by a factor of 2 or 3 without increasing the bulk.
  • the embedding technique of the fourth method makes it possible to obtain the highest overvoltages.
  • the frequency stability depends a lot on the quality of the embedding.
  • the best results are obtained by hot punching under a neutral atmosphere, for example at 500 ° C. under nitrogen, optionally followed by an aging stage carried out under the same conditions.
  • the duration of the landing can be of the order of one hour.
  • Figure 9 shows the same resonator as that shown in Figure 8 but seen at one of its ends.
  • the jumper 51 is placed in a housing 52 intended to receive it and made in the bar 50.
  • the punches 53 act on the jumper 51 in the direction indicated by the arrows in order to embed the jumper.
  • Figure 10 shows the result obtained after punching.
  • the fifth method, in situ molding, requires the use of dielectric parts forming the negative impression of the metal part. This can be preformed and placed in the dielectric. The whole is brought to a temperature slightly higher than the melting temperature of the metal and then cooled slowly. Silver works particularly well.
  • the jumper is made of copper and is embedded by punching. Under these conditions, the overvoltage coefficient Q is equal to 1000 at the frequency of 950 MHz. This is a very good result given the size of the resonator.
  • FIG. 13 schematically represents the arrangement envisaged for a filter with three resonators 70, 73 and 76. These are quarter-wave resonators with two resonances. They are formed as for FIG. 12 of metallic reinforcements enclosing a dielectric bar not shown and situated in planes perpendicular to one another.
  • the resonator 70 includes the pairs of frames 71 and 72, the resonator 73 includes the couples 74 and 75 and the resonator 76 includes the couples 77 and 78.
  • the resonators are placed in the extension of each other as shown in Figure 13.
  • the armatures 71 and 74 located in the same plane or in parallel planes provide a preponderant magnetic coupling between the resonators 70 and 73.
  • the value of these couplings is adjusted by the distances between resonators.
  • the input signal is injected via a coupling loop at the pole P 1 .
  • the output signal is extracted in the same way at the P6 pole. Couplings of the intra-resonator type are rather ensured by the electric fields in the dielectric and are regulated by the defects of symmetry of the resonator (defect of orthogonality of two armatures, influence of the case, etc.).
  • the resonators which can be used in this type of filter can be produced using techniques described for the manufacture of biruban or bifilar resonators.
  • the very section of the dielectric is determined by additional considerations (heat dissipation, convenience of fixing) and can be square, round, octagonal.
  • FIG. 14 represents the octagonal section of a dielectric bar 80 equipped with two armatures 83 and 84 placed in perpendicular planes. The resonator thus formed can be placed without inconvenience between two metal surfaces 81 and 82.
  • FIGS. 17 and 18 represent front and side views of a quarter wave resonator formed by a dielectric bar 95 covered with a metallization 96 on two opposite faces and one end.
  • the resonator includes sections of different surfaces.
  • the inter-electrode width remains constant but it is the transverse dimension of the bar which changes. This dimension which is worth b near the open circuit, is worth b ' ⁇ b near the short circuit. This has the consequence of increasing the inductance and therefore of decreasing the resonant frequency.
  • the dielectric material it is essential to choose the dielectric material so as to compensate for thermal drifts.
  • the coefficient expressing the first order drift in temperature equal to 0 ppm / ° C.
  • the reinforcement is only partially secured to the dielectric, it is necessary to compensate for the expansion of the metal by choosing coefficients typically between + 10 and + 20 ppm / ° C. Dielectrics having these characteristics The techniques have been described in the French patent published under the number FR-A-2 477 823.

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EP19850402432 1984-12-06 1985-12-06 Elektromagnetische Resonatoren und Filter mit solchen Resonatoren Expired EP0187579B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8418640A FR2568414B1 (fr) 1984-05-25 1984-12-06 Resonateurs electromagnetiques et filtres realises a partir de ces resonateurs.
FR8418640 1984-12-06

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EP0187579A1 true EP0187579A1 (de) 1986-07-16
EP0187579B1 EP0187579B1 (de) 1989-05-10

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2093750A (en) * 1934-07-09 1937-09-21 Philips Nv Doubly-folded lecher wire system
DE940052C (de) * 1952-10-01 1956-03-08 Siemens Ag Anordnung zur mechanischen Abstuetzung von Schwingspulen von hochfrequenten Kreisen
FR1131919A (fr) * 1954-04-20 1957-03-01 Patelhold Patentverwertung Dispositif pour le couplage variable de deux lignes de lecher
US2832892A (en) * 1954-12-24 1958-04-29 Du Mont Allen B Lab Inc Tuning device for ultra-high frequency circuits
US2838736A (en) * 1953-03-20 1958-06-10 Erie Resistor Corp High dielectric constant cavity resonator
US2894225A (en) * 1956-10-29 1959-07-07 Jr James Elmer Myers Tuning apparatus
EP0108003A1 (de) * 1982-10-29 1984-05-09 Thomson-Csf Doppelstreifen-Resonator und nach dieser Art gestaltetes Filter

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2093750A (en) * 1934-07-09 1937-09-21 Philips Nv Doubly-folded lecher wire system
DE940052C (de) * 1952-10-01 1956-03-08 Siemens Ag Anordnung zur mechanischen Abstuetzung von Schwingspulen von hochfrequenten Kreisen
US2838736A (en) * 1953-03-20 1958-06-10 Erie Resistor Corp High dielectric constant cavity resonator
FR1131919A (fr) * 1954-04-20 1957-03-01 Patelhold Patentverwertung Dispositif pour le couplage variable de deux lignes de lecher
US2832892A (en) * 1954-12-24 1958-04-29 Du Mont Allen B Lab Inc Tuning device for ultra-high frequency circuits
US2894225A (en) * 1956-10-29 1959-07-07 Jr James Elmer Myers Tuning apparatus
EP0108003A1 (de) * 1982-10-29 1984-05-09 Thomson-Csf Doppelstreifen-Resonator und nach dieser Art gestaltetes Filter

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DE3570156D1 (en) 1989-06-15
EP0187579B1 (de) 1989-05-10

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