EP3105814B1 - Filtre haute fréquence à structure coaxiale - Google Patents

Filtre haute fréquence à structure coaxiale Download PDF

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Publication number
EP3105814B1
EP3105814B1 EP15703873.8A EP15703873A EP3105814B1 EP 3105814 B1 EP3105814 B1 EP 3105814B1 EP 15703873 A EP15703873 A EP 15703873A EP 3105814 B1 EP3105814 B1 EP 3105814B1
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EP
European Patent Office
Prior art keywords
inner conductor
frequency filter
filter according
conductor
sheathing material
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EP15703873.8A
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German (de)
English (en)
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EP3105814A1 (fr
Inventor
Jens Nita
Martin Skiebe
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Kathrein SE
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Kathrein Werke KG
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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
    • H01P7/04—Coaxial resonators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
    • H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
    • H01B3/44—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins
    • H01B3/441—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins from alkenes
    • 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
    • H01P1/202—Coaxial 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
    • H01P1/2084—Cascaded cavities; Cascaded resonators inside a hollow waveguide structure with dielectric 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 invention relates to a high-frequency filter in coaxial design, in particular in the manner of a high-frequency filter (such as duplexer) or a band-pass filter or band-stop filter.
  • a high-frequency filter such as duplexer
  • a band-pass filter or band-stop filter such as duplexer
  • a common antenna is often used for transmit and receive signals.
  • the transmit and receive signals each use different frequency ranges, and the antenna must be suitable for transmitting and receiving in both frequency ranges.
  • a suitable frequency filtering is required, with the one hand, the transmission signals from the transmitter to the antenna and on the other hand, the received signals are forwarded from the antenna to the receiver.
  • inter alia high-frequency filters in coaxial design are used today.
  • a pair of high frequency filters may be used, both of which pass a particular frequency band (bandpass filter).
  • a pair of high frequency filters may be used, both of which block a particular frequency band (bandstop filter).
  • a pair of high frequency filters may be used, one of which passes frequencies below a frequency between transmit and receive bands and blocks frequencies above that frequency (low pass filter), and the other filter locks frequencies below a frequency between transmit and receive bands and overlying Passing frequencies (high pass filter).
  • High frequency filters are often manufactured in the form of coaxial TEM resonators. These resonators can be inexpensively and economically manufactured from milling or castings and they ensure a high electrical quality and a relatively high temperature stability.
  • a coaxial single resonator in milling or casting technique consists for example of a cylindrical inner conductor and a cylindrical outer conductor. It is also possible that the inner conductor and / or the outer conductor has a regular n-polygonal cross section in cross section transverse to the inner conductor.
  • the inner and outer conductors are at one end (usually on the bottom or bottom side) over a large area connected by an electrically conductive layer (usually short-circuited by an electrically conductive bottom). Between the inner and the outer conductor is usually air as a dielectric.
  • the mechanical length of such a resonator corresponds to one fourth of the electrical wavelength.
  • the resonant frequency of the coaxial resonator is determined by its mechanical length. The longer the inner conductor, the larger the wavelength and the lower the resonance frequency.
  • the electrical coupling between the resonators is the weaker the farther the inner conductors of two resonators are from each other and the smaller the coupling opening of the diaphragm between the inner conductors.
  • the inner conductor of the resonator is designed as a hollow cylinder and in the inner conductor an axially adjustable tuning element is provided, which consists of a dielectric material.
  • the beats EP 1 596 463 A1 in the formed as a hollow cylinder inner conductor adjustable tuning element made of ceramic, which, however, is coated at its above the inner conductor protruding front end and a far into the hollow cylindrical inner conductor far immersed area with a sleeve or pot-like tuning body, which made of metal consists.
  • WO 2004/084340 A1 which depicts and describes slidable dielectric tuning elements in coaxial filters.
  • a hollow cylindrical inner conductor in a coaxial resonator at its upper annular end face a hollow cylindrical ring of the same dimensions as the hollow cylindrical inner conductor is placed, wherein the patch hollow cylindrical ring made of ceramic with a high dielectric constant.
  • This ceramic ring with high dielectric constant and low dielectric losses should also be used without gaps between the open inner conductor end of the coaxial resonator and the underside of the lid. This should be feasible at the same resonant frequency smaller sizes.
  • the harmonics capable of propagating in the resonators should shift to higher frequencies.
  • both the outer conductor and the cylindrical inner conductor each consist of a dielectric as a carrier material.
  • a conductive layer is provided to form the inner conductor as well as to form the outer conductor.
  • the coaxial resonator is formed.
  • the dielectric of the outer conductor has an axial bore into which the inner conductor, which is applied to the inner dielectric, is formed, forming a radial spacer gap.
  • the US 4,268,809 describes a filter using several coaxial resonators.
  • a dielectric layer is proposed which covers together all the free ends of the inner conductors.
  • a conductive structure is then formed opposite the inner conductors, which is mechanically and galvanically connected to the inner conductor by means of electrically conductive screws which pass through the dielectric layer.
  • the conductive structures formed on the dielectric layer each terminate at a distance from each other, whereby a capacitive coupling is effected.
  • a resonator having a housing and a resonator inner conductor to be seen, which ends opposite to the housing bottom at a distance in front of the opposite housing wall and is coated on its free end face and optionally also on the circumferential adjacent portion of the resonator inner conductor with a dielectric layer.
  • This dielectric layer may have an ⁇ r value of 37.
  • the resonator inner conductor has an inner conductor head which is coated with the mentioned dielectric, this dielectric head having a diameter which corresponds approximately to three times the portion of the resonator inner conductor located therebelow.
  • the dielectric layer itself has a thickness which corresponds at least to the order of magnitude of the thickness of the resonator inner conductor in the region below the resonator inner conductor head, which is provided with a larger diameter.
  • a cavity filter is also out of the US 2009/167464 A1 refer to.
  • a resonator chamber provided with an axial bore resonator inner conductor is provided, which ends at a distance relative to the housing cover.
  • the peripheral wall of the resonator inner conductor provided with the axial bore, as well as a slight remaining end-side material portion at the free end of the resonant inner conductor, are coated with an insulating layer.
  • This publication also describes a resonator with a resonator inner conductor, wherein the resonator inner conductor provided with an axial bore has a circumferential flange at its free end, on which an annular dielectric material is provided.
  • the thickness of this dielectric material parallel to the direction of extension of the hollow resonator inner conductor is a multiple of the material thickness of the resonator inner conductor.
  • a resonator element made of a dielectric material (the axial height of which is smaller than its diameter) is fastened to the housing base made of metal.
  • the JP 2002 016411 A teaches in contrast to previously known solutions, for example, by the resonator has been fixed by plastic, to use a threaded rod, which is inserted into a blind hole on the underside of the dielectric resonator element, and then attached to the threaded rod dielectric resonator element until it stops at the bottom of the housing Screw housing of the filter assembly into a bore provided with an internal thread.
  • the resonator element itself should have an overall diameter which is in the order of about 0.6 mm to 0.7 mm.
  • the maximum power handling capacity is considered as one of the limiting factors for the reduction of the filter assemblies.
  • the power handling is essentially determined by the distance between the open center conductor end and the generally grounded covers and / or sidewalls, tuning elements, etc. A larger distance leads to higher possible powers. Depending on the required minimum performance, minimum distances must not be fallen below, as otherwise destructive flashovers (microwave break down) may occur inside the filter. Further reductions the filter assemblies are not possible.
  • the enclosing can be done with the help of one or more attached moldings. It has also proved to be favorable to encase the inner conductor or the essential parts of the inner conductor completely or partially with corresponding plastic material which has the desired or suitable dielectric values.
  • the maximum power handling capability can be controlled via the thickness of the dielectric layer.
  • Thinner layers mean lower dielectric losses and thus lower transmission loss for the filter.
  • the maximum power handling can of course also be influenced by the choice of the dielectric material and its specific properties.
  • the solution according to the invention makes it possible to implement the invention in the smallest space.
  • the corresponding dielectric coating in relation to the prior art has particularly low layer thicknesses or the sheathing material consists of a very specific material, namely consists of one or more cyclic olefin copolymers (COC) or one or more cyclic olefin copolymers (COC).
  • COC cyclic olefin copolymers
  • COC cyclic olefin copolymers
  • One of the main advantages of the invention is therefore based on the fact that the volume of the resonator chamber, ie the size of the filter assemblies, can be reduced, which leads to an overall lower construction cost. Nevertheless, within the scope of the invention, a higher power handling capacity of the filters can be achieved, and this with an overall simple manufacturing process.
  • the patched or overmolded inner conductors form an independent part.
  • the full-surface or partial coating or the full-surface or partial casing formed there with the corresponding dielectric material, at least in the area of the free inner conductor end, can be realized for all imaginable inner conductor shapes.
  • the internal conductors used in the present resonators in the invention can consist of both metal and dielectric, for example of ceramic.
  • the encapsulation in one or more or all internal conductors of a corresponding high-frequency filter can be performed.
  • the enclosing, in particular in the form of investment or Umgie wets both in home-made inner conductors or even insertable inner conductors perform that are screwed, for example, in the resonator, screwed, pressed or otherwise mechanically attached and galvanically connected. This also leads to a simple handling, since the over-molded with the corresponding sheath material inner conductor forms an independent component.
  • plastic molded parts can also be manufactured separately and then placed on the inner conductor.
  • the moldings may be provided with corresponding holders and locking devices, which are designed like a finger and, for example, in the radial direction or predominantly in the radial direction of the housing inner wall or support the walls and / or are attached with one or more finger-like spacers on the inside or underside of the lid.
  • FIG. 1 is in axial section parallel to the axial axis X and in FIG. 2 in horizontal section along the line II-II in FIG. 1 a first embodiment of a coaxial resonator, shown here in the form of a single resonator.
  • a plurality of such resonators can be assembled into filter groups, for example in the form of a bandpass filter or a blocking filter, etc. In this respect, reference is made here to known solutions.
  • the coaxial filter comprises an outer conductor housing 1 with an outer conductor 1 ', a in the embodiment shown concentrically and coaxially arranged inner conductor 3 and a bottom or housing bottom 5, in which the electrically conductive outer conductor 1 and the electrically conductive inner conductor 3 are electrically connected to each other.
  • FIG. 1 The basis of Figures 1 and 2 shown resonator has a square cross-section, wherein the outer conductor housing 1 comprises a cover or housing cover 7, with which the resonator interior 19 is closed.
  • the inner conductor 3 shown in the drawings can be integral with the outer conductor housing 1, i. in particular connected to the bottom 5 or attached and attached there as a separate component and be galvanically connected to the ground. This can be done for example by using appropriate screws, which can be screwed, for example via a bore in the housing bottom in an internal thread in the inner conductor 3 or screwed in using a mother sitting there.
  • FIG. 3 is in deviation to the illustration according to FIG. 1 merely shown that - as is also common - a corresponding adjustment of the resonant frequency by adjusting an example in the housing cover 7 rotatably accommodated adjusting or tuning element 9 can take place, which can be different degrees on the inner conductor 3 to or away from this twisted.
  • this adjusting element 9 is seated in a threaded bushing 17, which is galvanically connected thereto, while the lid 7 axially and concentrically passes through the inner conductor 3 or directly in a threaded hole in the lid itself.
  • the aforementioned, on the lid 7 different in the resonator 19 and on releasable adjustment element 9 can be configured by its diameter and diameter shape so that it 3c in a corresponding and ending at the end face 3a axial bore in the Inner conductor 3 can intervene.
  • the mentioned adjusting elements 9 may consist of metal or for example of a dielectric. It is also referred to known solutions so far.
  • the inner conductor as a hollow, ie, in the embodiment shown may be formed as a hollow cylindrical inner conductor, for example, in the bottom region, an actuating element 109 may be provided, which in the embodiment shown from a Threaded plate or threaded pot is made.
  • This threaded plate or threaded pot has an outer thread on its outer circumference, which engages with a corresponding internal thread on the inner side 3b of the inner conductor 3c provided with an inner bore 3c.
  • the aforementioned inner conductor 3 may be integrally connected, optionally materially and thus galvanically connected to the housing bottom of the outer conductor walls.
  • a resonator can be produced, for example, by milling from a metal block, wherein it has already been noted that the inner conductor 3, for example, subsequently mechanically and galvanically connected to the ground, for example by using screws.
  • FIG. 5a Based on FIG. 5a is now in spatial Axialschnittdar ein and in FIG. 5b in axial section, a first and second embodiment of a resonator according to the invention with a correspondingly adapted, inventive inner conductor shown.
  • the inner conductor 3 In the exemplary embodiment shown, provision is made for the inner conductor 3 to have an inner conductor end face 3a which extends in the radial direction beyond the other outer diameter of the inner conductor 3, to form a disk-shaped inner surface, which is not absolutely necessary in the context of the invention.
  • Conductor extension region 33 This inner conductor extension region 33 has an outer diameter 3e, which usually corresponds to 1.01 to 4 times the other outer diameter 3d of the inner conductor 3, for example, 1.75 to 2.25 times.
  • the thickness 35 of this inner conductor extension region 33 can also be chosen differently. It can, for example, move between 0.5 mm to 6 mm, for example be greater than 1 mm, 1.5 mm, 2 mm or 2.5 mm. It can also be smaller than 5.5 mm, 5 mm, 4.5 mm, 4 mm or 3.5 mm. Values around 3 mm are often suitable.
  • the end face 3a thus formed with the associated end face region 3'a can be completely or partially coated with a suitable dielectric material in a partial height, preferably starting from the end face 3a in the direction of the bottom 5.
  • a corresponding cladding material 21 is provided here, which on the surface 23 of the inner conductor 3, for example, to the in FIG. 5a or FIG. 5b formed Provision provided, arranged, placed, overmoulded or molded, so generally the sheath material 21, the inner conductor 3, for example, at the points shown in the drawings completely or partially sheathed.
  • the sheath material 21 may rest directly on the surface 23 of the inner conductor 3, for example at the points shown (but also at other locations), but optionally also indirectly with the formation of intermediate layers, eg air, between the surface 23 and the adjacent layer of the Sheath material 21.
  • this sheath material 21 in this embodiment inter alia on the end face 3a of the disc-shaped extension region 33, also in the inner or axial bore 3c on the inner wall formed there 3f (which is part of the entire surface 23 of the inner conductor 3) in an axial height 36, on the outer circumference 3g of the disk-shaped enlargement region 33 and partly on the underside 3h of this extension region 33 is formed.
  • this sheathing material 21 or this layered sheath material 21 may be applied to the corresponding inner conductor at the described locations, so that at the points where the sheath stops, one of the layer thickness corresponding paragraph 25 is formed, such as on the underside 3h of the disk-shaped enlargement region 33.
  • the embodiment according to FIG. 5a also, that where the sheath material 21 is provided, the material of the inner conductor 3 may be prepared accordingly.
  • a corresponding material recess 3i is provided, for example, in the region of the inner axial bore 3c of the inner conductor 3, and here corresponding to the inner axial height 36.
  • the inner bore 3c, ie the surface (inner wall) 3f of the inner conductor bore 3c is free of stepped shoulders can transition from the material of the inner conductor to the sheath material 21 in the region of the inner axial height 36, as can be seen from FIG. 5a can be seen.
  • FIG. 5b is to be shown in deviation that the material recess 3i (to form a first drill section 3.1 with a larger diameter drill) with greater depth than the layer thickness of the sheath material 21 in the region of the central bore section 3.2 of the inner axial bore 3c can be worked out so that still another Stepped shoulder 37 is generated, at which the inner axial bore 3c merges with the bore section with a smaller inner diameter.
  • the middle drill section with a medium bore diameter then passes into a lower drill section 3.3 or can pass over, which has the smallest drill diameter.
  • the inner conductor bore 3c is introduced to form a shoulder 3j at the lower end, that is, under a taper of the bore diameter. This allows the inner conductor to be mechanically anchored and galvanically connected to the bottom 5 of the resonator using screws and nuts.
  • FIG. 5b are opposite to the variant FIG. 5a made small modifications.
  • the embodiment according to FIG. 5b is at the transition from the inner conductor hole 3c to the upper end face 3a of the inner conductor 3 each incorporated a conical chamfer 3k through which the bore 3c extends quasi upwards.
  • chamfers 3l and 3m are also machined on the upper peripheral edge 33a and the lower circumferential edge 33b of the inner conductor extension region 33, preferably 45 ° bevels, whereby a transition from one boundary surface to the next on the inner conductor extension region 33 respectively in a 135 ° angle is made possible.
  • all bevels can be formed at arbitrary angles. Instead of bevels and radii or curves in any designs are conceivable.
  • the outgoing shoulder of the sheath material 21 provided on the underside 3h of the disc-shaped inner conductor widening region 33 (which may also be referred to as widening platform 33) is provided with an obliquely tapering chamfer 3n. This is aligned in the embodiment shown at a 45 ° angle to the orientation of the disk-shaped extension region 33, so that overall, as in FIG. 5b is shown, an opening angle ⁇ of 90 ° between the opposite tapered chamfers 3n results.
  • An inner conductor 3 designed in this way according to the invention can be produced by appropriate preprocessing of the inner conductor material - if this is necessary at all - and then applied or encapsulated with a corresponding sheath material 21 provided in the context of the invention, namely already with a correspondingly prefabricated resonator in which the inner conductor, the bottom and the housing outer walls are made, for example, of a one-piece metal block.
  • the inner conductor can be molded separately and subsequently connected, for example, with a screw to the bottom of the resonator.
  • the sheath material 21 consists of a cast-on sheath layer 21a.
  • the corresponding sheathing material 21 it is also possible for the corresponding sheathing material 21 to be produced separately, for example cast and subsequently placed on the inner conductor 3. So here is the sheath material 21 in the form of a molded part 21b before, in particular a plastic molded part 21b, generally a dielectric molded part 21b, which may be formed in one or more parts, so one or more pieces and then placed on the inner conductor.
  • FIGS. 6 to 13 schematic Axialmaledarwolfen by a resonator comparable to FIG. 1 reproduced, in each of which the resonator housing is indicated in section, with inner inner conductor.
  • the inner conductor is shown as a solid block.
  • the sheathing material 21 is cup-shaped here and placed in the manner of an inverted pot or a reverse box from above on the inner conductor 3 according to the pot height of this sheath material 21, so for example using a molded part 21b.
  • the sheath material 21 may be formed as a molded sprue 21 a on the inner conductor 3.
  • the inner conductor in a certain axial extent an inner conductor bore 3c, in which - as explained - a housed in the lid, different far on and auspitbaren threaded element for adjusting the resonant frequency can be screwed.
  • the sheath material 21 can be sprayed or placed in prefabricated form accordingly.
  • the sheathing material 21 is at a certain axial height from the end face of the inner conductor on the outer circumference 3g of the inner conductor 3 and on the inner wall 3b of the inner conductor bore 3c provided to the bottom 30 of the inner conductor bore and formed there.
  • FIG. 8 corresponds to that FIG. 6 , with the difference that, for example, a correspondingly manufactured separately and subsequently attached plastic molded part 21b on its upper side, which rests on the end face of the inner conductor, with an integrally formed support 31, for example in the form of a slightly elastic finger-shaped extension 31a, provided is ultimately supported on the bottom 7a of the housing cover 7 and rests under at least slight (elastic) bias.
  • a correspondingly manufactured separately and subsequently attached plastic molded part 21b on its upper side which rests on the end face of the inner conductor, with an integrally formed support 31, for example in the form of a slightly elastic finger-shaped extension 31a, provided is ultimately supported on the bottom 7a of the housing cover 7 and rests under at least slight (elastic) bias.
  • the sheathing material 21 is held captive on the inner conductor 3 in the form of a separately produced and attached plastic molded part 21 b.
  • FIG. 9 shows an embodiment in which the basis of FIG. 7 shown plastic molding 21b at two or more offset in the circumferential direction lying points (or even more places) with correspondingly shaped supports 31, for example in the form of two finger-shaped elevations 31a may be formed, which - as explained above - under bias supported on the underside of the lid 7.
  • two or more circumferentially offset molded supports 31 also provided again in the form of finger-shaped elevations 31 a, but not in the direction of the lid, but rather run in the radial direction with at least greater radial than axial component and are supported on the inner side 1 a of the outer conductor 1, preferably also again under at least slight bias.
  • FIGS. 11 to 13 Based on the embodiments according to the FIGS. 11 to 13 Among other things, it is shown that a plurality of different plastic molded parts or different sheathing materials 21 and thus different sheath material layers can be used.
  • the embodiments according to FIGS. 11 to 13 show that the most varied trained inner conductor can be used, with or without protruding disc-shaped extension adjacent to their free end face 3a, with or without different far inside the inner conductor engaging inner or axial bore 3c etc. restrictions exist insofar as regards the design of the inner conductor not ,
  • the inner conductor 3 according to its shape outside as in the region of its inner bore 3c and its end face 3a with a cladding material 21, ie here a first cladding material 21 'layered surrounded.
  • This layer can be cast or formed in the form of a plastic molding and subsequently attached.
  • this second cladding material 21 "could also be and / or be placed from above in the form of a second plastic molded part 21b.
  • FIG. 13 shows only a modified embodiment whose principles in principle with the principles according to the embodiment according to FIG. 11 to match.
  • first and second sheath materials 21 ', 21 can be formed even with an inner conductor 3 with or without inner conductor hole 3c, especially if the inner conductor at its upper inner conductor end below the housing cover 7 with a the Inner conductor otherwise radially superior disk-shaped plateau 33, so the so-called.
  • Inner conductor extension region 33 is provided.
  • the inner conductor 3 shown there is formed as a screwed inner conductor. That is, he has a design as based on FIG. 5a shown or similar.
  • Such an inner conductor 3 can then be placed on an underlying and with the bottom, that is, the housing bottom 5 of the resonator firmly connected inner conductor base 103 and mechanically by means of fürgecardten in the interior of the inner conductor screws on the resonator firmly anchored, preferably for producing a galvanic connection.
  • the mentioned cladding material 21, for example in the form of the first and / or the first and second cladding material 21, has a relative permittivity ⁇ r which is greater than 1.2.
  • Preferred values for the dielectric constant ⁇ r are greater than 1.3, in particular greater than 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2, 2.1, 2.2, 2, 3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9 and 3.0.
  • the aforementioned cladding material 21, 21 ', 21 consists, as explained, of a dielectric material, whereby typical and preferred dielectric materials in the context of the invention are so-called cyclic olefin copolymers (COC).
  • COC cyclic olefin copolymers
  • the layer thickness for the cladding material 21, in the case of a multi-part layer structure, also with regard to the layer thickness of each of the individual layers, can be selected in different ranges. It is possible that the thickness of the cladding material 21 is at least 0.05 mm, in particular more than 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm and more, and preferably has a thickness of 3 mm and less.
  • cyclic olefin copolymers are materials which are amorphous and thus transparent. Cyclic olefin copolymers are characterized by good thermoplastic flowability, high rigidity, strength and hardness as well as low density and high transparency with good acid alkali resistance.
  • the described filters and the described coaxial resonator can be used in broad areas, in particular in mobile radio technology, for example for coaxial bandpass filters, coaxial bandstop filters, asymmetric bandstop filters, high-pass filters, duplexers, combiners and / or low-pass filters.
  • Typical applications are in the mobile sector in frequency ranges from 380 MHz to 4,000 MHz.
  • the frequency ranges above 700 MHz, 800 MHz, 900 MHz, 1,500 MHz, 1,700 MHz, 1,800 MHz, 1,900 MHz, 2,000 MHz, 2,100 MHz, 2,500 MHz, 2,600 MHz or above 3,500 MHz are of particular importance.
  • a coaxial resonator and filter or filter assemblies can be realized, which by the whole or partial enclosure of the inner conductor, especially in the region of its free end face and the adjacent areas with dielectric material, a higher power handling and dielectric strength of the individual resonators and thus the filter achieve, compared with the previously known solutions.
  • This filter can be realized with higher maximum transmission power.
  • the enclosing of the invention with the explained dielectric material allows smaller distances between the inner conductor and the side walls and / or the housing cover and / or tuning elements 9, 9 'provided in the interior of the resonators.
  • This filter can be realized with smaller dimensions, which nevertheless have the same power handling.
  • the invention leads to a reduction in size and ultimately contributes to a reduction in costs.
  • the dielectric used or proposed in the context of the invention makes it possible to use tuning elements a large tuning range or a large frequency deviation.

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  • Spectroscopy & Molecular Physics (AREA)
  • Electromagnetism (AREA)
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Claims (14)

  1. Filtre haute fréquence comportant au moins un résonateur coaxial, présentant les caractéristiques suivantes :
    - le résonateur coaxial comprend un boîtier conducteur extérieur (1) formant un conducteur extérieur (1'),
    - un conducteur intérieur (3) est disposé dans le boîtier conducteur extérieur (1) et est relié de manière mécanique et galvanique, sur un de ses côtés, au boîtier conducteur extérieur et, sur son côté opposé, se termine à une certaine distance du boîtier conducteur extérieur (1) ou d'un couvercle de boîtier (7) qui y est prévu et qui appartient au boîtier conducteur extérieur (1),
    - le boîtier conducteur extérieur (1) et le conducteur intérieur (3) se composent d'un matériau électriquement conducteur ou sont recouverts d'un matériau électriquement conducteur,
    - le conducteur intérieur (3) comprend une face frontale (3a) et une autre surface (23) adjacente à celle-ci, la face frontale (3a) et l'autre surface (23) adjacente à celle-ci étant complètement ou partiellement recouvertes d'un matériau de revêtement (21),
    - le matériau de revêtement (21) se compose d'un matériau diélectrique, et
    - le matériau diélectrique présente une constante diélectrique εr supérieure à 1,2, l'épaisseur du matériau de revêtement (21) est supérieure à 0,05 mm et inférieure à 3 mm,
    caractérisé par les caractéristiques supplémentaires suivantes :
    - le matériau de revêtement (21) se compose d'un matériau diélectrique sous forme d'un ou plusieurs copolymères de cyclo-oléfine (COC) ou comprend un matériau diélectrique sous forme d'un ou plusieurs copolymères de cyclo-oléfine (COC), et
    - le matériau de revêtement (21) est
    a) espacé par rapport à la face inférieure du couvercle de boîtier (7) et au côté intérieur (la) du conducteur extérieur (1), ou
    b) muni d'au moins un ou de préférence de plusieurs appuis (31) qui s'étendent dans le sens axial et/ou radial à partir du matériau de revêtement (21) et sont en appui, de préférence de manière élastique, sur la paroi intérieure du boîtier conducteur extérieur et/ou du couvercle de boîtier (7).
  2. Filtre haute fréquence selon la revendication 1, caractérisé en ce que la constante diélectrique pour le matériau diélectrique est supérieure à 1,3, notamment supérieure à 1,4, 1,5, 1,6, 1,7, 1,8, 1,9, 2, 2,1, 2,2, 2,3, 2,4, 2,5, 2,6, 2,7, 2,8, 2,9 et 3,0.
  3. Filtre haute fréquence selon la revendication 1 ou 2, caractérisé en ce que le matériau de revêtement (21) est constitué sous la forme d'une pièce moulée par injection (21a) ou d'une pièce moulée par aspersion directe et/ou surmoulée sur le conducteur intérieur (3).
  4. Filtre haute fréquence selon la revendication 1 ou 2, caractérisé en ce que le matériau de revêtement (21) est constitué sous la forme d'une pièce façonnée (21b), qui est placée sur le conducteur intérieur (3).
  5. Filtre haute fréquence selon l'une des revendications 1 à 4, caractérisé en ce que le matériau de revêtement (21) est constitué de plusieurs parties et comprend au moins un ou deux matériaux, qui sont formés par aspersion directe et/ou surmoulés sur le conducteur intérieur (3) et/ou placés sur le conducteur intérieur (3) sous la forme d'une pièce moulée séparée (21b).
  6. Filtre haute fréquence selon l'une des revendications 1 à 5, caractérisé en ce que le matériau de revêtement (21) est formé sur la face frontale (3a) et sur la périphérie extérieure et/ou, au moins sur une hauteur axiale (3b), sur la périphérie intérieure à proximité d'un alésage axial intérieur (3c) du conducteur intérieur (3).
  7. Filtre haute fréquence selon l'une des revendications 1 à 6, caractérisé en ce que le conducteur intérieur (3) présente, sur son extrémité frontale (3a), une région élargie (33) circulaire faisant saillie dans le sens radial, de préférence sous forme d'une région élargie (33) en forme de disque.
  8. Filtre haute fréquence selon la revendication 7, caractérisé en ce que la région élargie (33) présente un diamètre extérieur (3e) qui correspond à 1,01 à 4 fois le diamètre extérieur restant (3d) du conducteur intérieur (3).
  9. Filtre haute fréquence selon la revendication 7 ou 8, caractérisé en ce que le matériau de revêtement (21) est également formé sur la face inférieure (3h) de la région élargie (33) du conducteur intérieur (3).
  10. Filtre haute fréquence selon l'une des revendications 1 à 9, caractérisé en ce que l'épaisseur du matériau de revêtement (21) est supérieure à 0,1 mm, 0,2 mm, 0,3 mm, 0,4 mm, 0,5 mm et plus.
  11. Filtre haute fréquence selon l'une des revendications 7 à 9, caractérisé en ce que la région élargie (33) présente un chanfrein (3k, 31, 3m) vers la périphérie extérieure, de la périphérie extérieure jusqu'à la face inférieure et/ou au niveau de la transition vers un alésage axial intérieur (3c).
  12. Filtre haute fréquence selon la revendication 11, caractérisé en ce que lesdits un ou plusieurs appuis (31) sont constitués sous la forme d'un ou plusieurs prolongements en forme de doigt ou saillies en forme de doigt (31a).
  13. Filtre haute fréquence selon l'une des revendications 1 à 12, caractérisé en ce que le matériau de revêtement (21) est une pièce moulée (21b) en une ou plusieurs parties, qui vient s'encliqueter sur le conducteur intérieur (3) de préférence doté de contre-dépouilles.
  14. Filtre haute fréquence selon l'une des revendications précédentes, caractérisé en ce que le conducteur intérieur (3) et/ou le matériau de revêtement (21) sont constitués d'une seule pièce et/ou en ce que moins de 80 %, de préférence moins de 60 %, de manière davantage préférée moins de 50 %, de manière encore davantage préférée moins de 30 % de l'autre surface (23) du conducteur intérieur (3) adjacente à la face frontale (3a) du conducteur intérieur (3) sont recouverts par le matériau de revêtement (21).
EP15703873.8A 2014-02-13 2015-02-05 Filtre haute fréquence à structure coaxiale Active EP3105814B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014001917.9A DE102014001917A1 (de) 2014-02-13 2014-02-13 Hochfrequenzfilter in koaxialer Bauweise
PCT/EP2015/000226 WO2015120964A1 (fr) 2014-02-13 2015-02-05 Filtre haute fréquence à structure coaxiale

Publications (2)

Publication Number Publication Date
EP3105814A1 EP3105814A1 (fr) 2016-12-21
EP3105814B1 true EP3105814B1 (fr) 2018-06-13

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EP15703873.8A Active EP3105814B1 (fr) 2014-02-13 2015-02-05 Filtre haute fréquence à structure coaxiale

Country Status (6)

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US (1) US10644376B2 (fr)
EP (1) EP3105814B1 (fr)
KR (1) KR101938345B1 (fr)
CN (1) CN105993096B (fr)
DE (1) DE102014001917A1 (fr)
WO (1) WO2015120964A1 (fr)

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GB201511325D0 (en) * 2015-06-29 2015-08-12 Radio Design Ltd Filter apparatus and method of use thereof
US10122061B2 (en) 2015-12-04 2018-11-06 Telefonaktiebolaget Lm Ericsson (Publ) Coaxial resonator with dielectric tip
EP3331093A1 (fr) 2016-12-01 2018-06-06 Nokia Technologies Oy Résonateur et filtre le comprenant
KR101906464B1 (ko) * 2017-01-11 2018-10-10 (주)웨이브텍 마이크로웨이브 공진기
US11114994B2 (en) 2018-12-20 2021-09-07 Avx Corporation Multilayer filter including a low inductance via assembly
WO2024145844A1 (fr) * 2023-01-04 2024-07-11 思摩尔国际控股有限公司 Appareil de génération d'aérosol et ensemble de chauffage par micro-ondes associé

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Also Published As

Publication number Publication date
KR20160120737A (ko) 2016-10-18
DE102014001917A1 (de) 2015-08-13
KR101938345B1 (ko) 2019-01-14
US10644376B2 (en) 2020-05-05
EP3105814A1 (fr) 2016-12-21
US20190036195A1 (en) 2019-01-31
CN105993096B (zh) 2021-04-09
CN105993096A (zh) 2016-10-05
WO2015120964A1 (fr) 2015-08-20

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