EP2894709B1 - Filtre avec résonateurs coaxiales - Google Patents

Filtre avec résonateurs coaxiales Download PDF

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Publication number
EP2894709B1
EP2894709B1 EP14305032.6A EP14305032A EP2894709B1 EP 2894709 B1 EP2894709 B1 EP 2894709B1 EP 14305032 A EP14305032 A EP 14305032A EP 2894709 B1 EP2894709 B1 EP 2894709B1
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EP
European Patent Office
Prior art keywords
conductive
frequency band
conductive resonance
signal
resonance
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EP14305032.6A
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German (de)
English (en)
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EP2894709A1 (fr
Inventor
Efstratios Doumanis
Florian Pivit
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Alcatel Lucent SAS
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Alcatel Lucent SAS
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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
    • 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
    • H01P1/205—Comb or interdigital filters; Cascaded coaxial cavities
    • H01P1/2053—Comb or interdigital filters; Cascaded coaxial cavities the coaxial cavity resonators being disposed parall to each other

Definitions

  • the present invention relates to a resonant assembly.
  • Resonant devices are known. In low-frequency electronics, a resonant circuit contains a capacitor and a coil. The capacitor is used to store electrical energy and the coil stores magnetic energy. At resonance, energy stored in the resonant circuit is continuously converted between two states, swapping between capacitor and coil over time. At higher frequencies, transmission lines can resonate. A quarter-wavelength transmission line with one end grounded and the other end open can be seen as a combination of a capacitor and coil. Increasing the permittivity of the transmission line by using, for example, ceramic materials reduces the size of the resonant device. Resonant devices are often used in radio-frequency (RF) front ends. Each resonant device has its own characteristics, including its own resonance frequency. The resonance frequency is dependent on the characteristics of the device and, in particular, on the characteristics of the mixtures of various materials making up the device.
  • RF radio-frequency
  • US 2003/0137368 A1 discloses a multi-mode resonator device. Coupling between a TEM mode as a resonance mode of the semi-coaxial resonator and a TM mode as another resonance mode can be facilitated, which enables coupling between the resonators at a predetermined coupling strength.
  • a conductive rod and a dielectric core are disposed so as to substantially equalize a quasi-TEM mode resonant frequency generated by the cavity and the conductive rod and a quasi-TM-mode resonant frequency generated by the cavity and the dielectric core.
  • a coupling adjusting block is arranged at a place where the magnetic field of one of two coupling modes generated by the quasi-TEM and quasi-TM modes is strong and that of the other mode is weak.
  • US 7,327,210 B2 discloses a microwave filter and method for remotely tuning a microwave filter from one sub-band to another sub-band using metallic rings to adjust the capacitance or inductance of the resonator
  • a plurality of metallic rings are disposed in the upper section or end of the resonator.
  • Each ring has an RF switch that connects or disconnects each ring to ground, thereby varying the capacitance of the resonator.
  • a plurality of metallic rings are disposed perpendicular to the magnetic field of the resonator.
  • Each ring has an RF switch disposed within the electrical path of the ring that opens or closes the electrical path of each ring. By opening and closing each ring, the magnetic field of the resonator is altered, thereby varying the inductance of the resonator
  • WO 2009/067056 A1 discloses a filter which is adapted for use in a wireless communications network, the filter comprising a housing enclosing two or more filter rods. At least two separate rods inside the housing are arranged essentially orthogonal relative to each other, forming part of a resonator adapted to filter radio frequency signals
  • a resonator assembly comprising: a resonator having a conductive resonance post surrounded by a conductive enclosure defining a cavity, the conductive resonance post being operable to filter a signal within a first frequency band, and a conductive resonance ring element positioned around the conductive resonance post, the conductive resonance ring element being operable to filter a signal within a second frequency band concurrently with the conductive resonance post filtering the signal within the first frequency band.
  • the first aspect recognizes that conventional resonators such as, for example, a transverse electromagnetic (TEM) combline resonator consist of a metallic cavity enclosure (with a generally circular shaped or rectangular shaped cross section) with a cylindrically-shaped metallic post at the centre of the circular/rectangular cavity grounded at one side and open-circuit at the opposite side.
  • TEM transverse electromagnetic
  • Each of these resonators is dimensioned to provide a resonance at a particular desired frequency.
  • the first aspect recognizes that it is possible to reuse the cavity in order to provide a resonator which resonates at more than one particular desired frequency so that more than one resonance can be achieved concurrently or simultaneously.
  • the resonator assembly comprises a resonator.
  • the resonator comprises a conductive resonance post.
  • the conductive resonance post is surrounded by a conductive enclosure which defines a cavity.
  • the conductive resonance post filters a signal at a first frequency band. That is to say, the conductive resonance post resonates at a frequency within a first frequency band, thereby attenuating frequencies of the signal outside of the first frequency band.
  • the resonator also has a conductive resonance ring element.
  • the conductive resonance ring element is positioned or located around the conductive resonance post.
  • the conductive resonance ring filters a signal within a second frequency band.
  • the second conductive resonance ring resonates at a frequency within the second frequency band, thereby attenuating frequencies of the signal which fall outside of the second frequency band.
  • the filtering of the signals within the first frequency band and the second frequency band occurs simultaneously or concurrently so that the filtering within the two frequency bands occurs at the same time using a single resonator.
  • the conductive resonance ring element is electrically isolated from the conductive enclosure.
  • the conductive resonance ring element may be insulated from the conductive enclosure. This facilitates the resonance of the conductive resonance ring element.
  • the resonator comprises an insulating mounting operable to retain the conductive resonance ring element within the conductive enclosure. It will be appreciated that a variety of different mounting structures may be utilized to retain the conductive resonance ring element in place.
  • the conductive resonance ring element has a length corresponding to a wavelength and/or less at a frequency within the second frequency band. Accordingly, the conductive resonance ring element is dimensioned to have an effective electrical length of a single wavelength at a selected frequency within the second frequency band. This enables a stationary standing wave at the selected frequency to be established within the conductive enclosure for the conductive resonance ring element. The length can be adjusted to less than a wavelength by capacitively loading the conductive resonance post.
  • the conductive resonance post upstands from a first face of the conductive enclosure, other faces of the conductive enclosure upstand from the first face and the conductive resonance ring element extends between the other faces. Accordingly, the conductive resonance post may extend from one face of the conductive enclosure. The conductive resonance post may be electrically connected to the conductive enclosure. Other faces of the conductive enclosure may also upstand from the first face and the conductive resonance ring may extend or be dimensioned between those other faces.
  • the conductive resonance post upstands from a first face of the conductive enclosure, other faces of the conductive enclosure upstand from the first face and the conductive resonance ring element extends between the other faces. Accordingly, the conductive resonance ring element may be orientated or positioned transversely to the elongate access of the conductive resonance post.
  • the plane is orientated orthogonally to the first axis.
  • the conductive resonance ring may be positioned or orientated orthogonally with respect to the elongate axis of the conductive resonance post. It will be appreciated that the orientation may not need to be completely normal to the elongate axis but may also be orientated at non-normal angles.
  • the conductive resonance ring element is located concentrically with the conductive resonance post. Accordingly, the conductive resonance ring element may at least partially surround the conductive resonance post. In one embodiment, the conductive resonance ring element is located coaxially with the conductive resonance post.
  • the conductive resonance ring element comprises at least a portion of one of an annulus, a torus and a polyhedron. Accordingly, the conductive resonance ring element may comprise a portion, sector or segment of an annulus, a torus or other ring-shaped polyhedron structure.
  • the conductive resonance post is electrically connected with the conductive enclosure.
  • the conductive resonance post has a length corresponding to a quarter-wavelength and/or less at a frequency within the first frequency band. Accordingly, the conductive resonance post is dimensioned to have an effective electrical length of a quarter wavelength at a selected frequency within the first frequency band. This enables a stationary standing wave at the selected frequency to be established within the conductive enclosure for the conductive resonance post. The length can be adjusted to less than a quarter wavelength by capacitively loading the conductive resonance post.
  • frequencies within the second frequency band are greater than frequencies within the first frequency band. Accordingly, the second frequency band encompasses frequencies which are higher than the frequencies in the first frequency band.
  • harmonics of the frequencies within the first frequency band fail to coincide with the frequencies within the second frequency band.
  • the harmonics of the different frequency bands are reduced. This helps to improve isolation between the two filtered signals.
  • 700MHz and 2100 MHz are used, the harmonics of the 700 MHz can coincide with the usable second frequency band.
  • coupling between the first frequency band elements and the second frequency band elements can occur.
  • the conductive resonance ring element is operable to filter two signals within a second frequency band concurrently with the conductive resonance post filtering the signal within the first frequency band. Accordingly, the conductive resonance ring may filter one signal in a first mode, whilst concurrently filtering another signal at a second mode. Hence, three signals can be filtered concurrently.
  • the resonator comprises a pair of feeds positioned orthogonally with respect to each other, each operable to convey one of the two signals to the conductive resonance ring element.
  • the resonator comprises at least one further conductive resonance ring element positioned around the first conductive resonance post, each further conductive resonance ring element being operable to filter a signal within a respective frequency band concurrently with the conductive resonance post filtering the signal within the first frequency band.
  • the additional conductive resonance ring elements may be provided, each of which may also filter signals concurrently within associated frequency bands. This enables yet more filtering to occur within the same resonator space.
  • each further conductive resonance ring element is operable to filter a signal within one of the second frequency band and another frequency band concurrently with the conductive resonance post filtering the signal within the first frequency band.
  • the resonator assembly comprises a plurality of the resonators adjacently located and having shared portions of the conductive enclosure. Accordingly, individual resonators may be positioned together to provide a resonant assembly having desired filtering characteristics.
  • the shared portions of the conductive enclosure comprise at least one aperture to facilitate coupling between adjacent resonators.
  • one of the plurality of resonators comprises a first signal feed operable to convey its signal to the resonance post of that resonator and another of the plurality of resonators comprises a second signal feed operable to convey its signal to the conductive resonance ring element.
  • Embodiments provide a resonator assembly having one or more resonators or filters.
  • Each of the resonators or filters is a dual-frequency resonator or filter which is able to concurrently or simultaneously filter signals within different frequency bands.
  • the same or different signals maybe provided to the resonator and the signals are filtered to exclude or reject all but a first frequency band which passes through, whilst the same or another signal is filtered simultaneously or concurrently to exclude or reject all but another frequency band which passes through.
  • the resonator comprises a conductive enclosure within which is provided with a conductive resonance post which filters within the first frequency band as well as a conductive resonant ring element which filters within a second frequency band.
  • the conductive resonance post may have any suitable cross-section which need not be circular.
  • the conductive resonance post is dimensioned to have a length which matches a quarter of the wavelength of a frequency within the first frequency band such that a standing wave is established within the structure at the selected resonant frequency.
  • the conductive resonance ring element is typically positioned around the first conductive resonance post in order to re-use the same space within the conductive enclosure to perform the dual-frequency filtering, which provides for a smaller and more lightweight arrangement than would be required if two different resonator or filter assemblies were provided, one for each filtering function.
  • the conductive resonance ring element is dimensioned to have a length which matches the wavelength of a frequency within the second frequency band such that a standing wave is established within the structure at the selected resonant frequency. This length of the conductive resonance ring element provides for an improved Q-factor of the device compared to other arrangements, which significantly reduces insertion losses resulting from use of the device.
  • the opportunity for coupling between adjacent resonators is increased, which simplifies the construction of the device and provides increased opportunities for the location of tuning mechanisms which are used to calibrate the resonance characteristics of the conductive resonance structures and control the resultant filtering characteristics.
  • Figure 1 illustrates the arrangement of a resonator, generally 10, according to one embodiment.
  • An enclosure 20 is provided which defines a cavity 30.
  • the enclosure 20 is a cuboid having six faces.
  • the enclosure 20 may have any suitable configuration and may be a non-cuboid.
  • the enclosure 20 is made of a conductive material, such as a metal, or may be made of another material which is then coated with a conductive material.
  • a conductive resonance post 40 is provided which extends into the cavity 30 from a face of the conductive enclosure 20.
  • the conductive resonance post 40 is electrically connected to the conductive enclosure 20.
  • the conductive resonance post 40 is dimensioned to have a length b1 which corresponds with a half wavelength of a frequency within the frequency band to be filtered and may have any suitable cross-section. In other words, the length b1 is selected to have an effective electrical length which corresponds to a quarter of the wavelength of a frequency within the frequency band to be filtered.
  • a tuning screw 50 is provided which is coaxially located, aligned with an elongate access of the conductive resonance post 40, and retained by and protruding from a face of the conductive enclosure 20. Rotation of the tuning screw 50 adjusts its length LSI within the cavity 30, which provides for fine-tuning of the resonance frequency of the conductive resonance post 40.
  • a conductive resonance ring 60 is provided which is placed around the conductive post 40.
  • the conductive resonance ring 60 again may be metallic or coated with a conductive coating.
  • the conductive resonance ring 60 is dimensioned to have a circumference which matches a wavelength of a frequency within a second frequency band. Typically, the second frequency band encompasses frequencies which are higher than those of the first frequency band.
  • a tuning screw is provided (not shown) which is used to provide fine adjustment of the resonance frequency of the conductive resonance ring 60.
  • a mounting (not shown) is provided in order to retain the conductive resonance ring 60 in place. This is typically achieved by a non-conductive pin or clip which mounts the conductive resonance ring 60 using either or both of a face of the conductive enclosure 20 or the conductive post 40. Alternatively, the conductive ring 60 may be mounted on plastic and the plastic may be retained as mentioned above.
  • this arrangement utilises the physical space provided by the single rectangular cavity 30 of a coaxially cavity resonator to include an additional metallic torus which operates at a full-wavelength resonance at the middle of the rectangular cavity 30. It will be appreciated that the vertical position of the conductive resonance ring 60 can be varied. Providing the conductive resonance ring 60 introduces an additional electromagnetic resonance at a higher frequency.
  • the conductive resonance ring 60 is shown as a torus, it will be appreciated that other configurations are possible, such as a ring of fixed thickness (an annular ring), or even a square, rectangular, hexagonal or other (typically regular) polyhedral ring may be provided. Also, although a complete ring is shown it will be appreciated that less than a complete ring may be provided. For example, a segment of the ring may be omitted, provided that the resultant structure was still dimensioned to resonate at a full wavelength.
  • additional conductive resonant rings may be provided, each of which is positioned around the conductive post 40.
  • Those additional conductive resonant rings may be dimensioned identically or differently to the conductive resonant ring mentioned above. This enables additional frequencies to be filtered (where the conductive rings are dimensioned differently) or multiple signals to be simultaneously filtered at the same frequency (where the conductive rings are identical). Again, appropriate apertures and feeds will be provided in order to achieve a filter having the desired characteristics.
  • the structural arrangement of the resonator 10 undergoes two electromagnetic resonances at two distinct frequency bands.
  • the conductive resonance post 40 resonates at a lower frequency band (f1) and the conductive resonance ring 60 resonates at a higher frequency band (f2).
  • the combination of the conductive resonance post 40 and the conductive resonance ring 60 means that the conductive post resonance 40 and the conductive resonance ring 60 resonate at slightly different frequencies than if they were alone within the cavity 30. However, this slight change in frequency can be accommodated by the dimensioning of these structures and by the tuning screws.
  • This basic structure is able to receive one or more signals to be filtered concurrently.
  • a signal may be provided which is coupled to the conductive resonance post 40 which then filters that signal to reject those frequencies which are outside of its resonant frequency or its harmonics.
  • the same or one or more different signals may be provided to the conductive resonance ring 60 which again rejects those frequencies which are outside of its resonant frequency or its harmonics.
  • the conductive resonance ring 60 is able to receive two signals (provided that the signal feeds are located orthogonally with respect to each other) in order to operate the conductive resonance ring 60 in a dual mode. This enables the conductive resonance ring 60 to receive two independent signals and to filter them concurrently.
  • FIGs 2A to 2C illustrate the electric field intensity distribution at resonance at the lower frequency (shown in Figure 2A ) and at the two degenerate modes (mode 1 and mode 2) at the higher frequency ( Figures 2B and 2C ).
  • the electric fields for the two higher frequency modes are orthogonal and so this can be exploited to provide simultaneous dual-mode filtering using a single conductive resonance ring 60.
  • Figures 3A and 3B illustrate the surface current density distribution at resonance at the higher frequency wavelength.
  • Figure 3A illustrates mode 1
  • Figure 3B illustrates mode 2. Again, it can be seen that the current density distribution is again orthogonal for the two modes.
  • the resonant frequency of the conductive resonance post 40 remains virtually unchanged at 694.778 MHz, whilst the first mode of the conductive resonance ring 60 resonates at 1796.65 MHz, with the second mode of the conductive resonance ring 60 resonating at 1796.84 MHz.
  • the resonant frequency of the conductive resonance ring 60 (around 1.8 GHz) differs sufficiently from the harmonic frequency of the conductive resonance post 40 (around 2 GHz) sufficiently enough to prevent resonant coupling between the two structures.
  • the results demonstrate that two resonant modes can be supported and that these closely correspond to the resonant modes of the individual standalone resonant modes of the low band and high band resonators.
  • the Q-factor of the low-frequency resonance is decreased (by around 7.7%) the resonance frequency of the conductive resonance post 40 remains substantively unchanged.
  • the Q-factor of the high frequency resonance is very high (almost 8000). This is due to the large electrical size of the cavity and the large area/volume provided by the conductive resonance ring 60 that is used to store energy.
  • Figure 4 illustrates the arrangement of coupling feeding pins used to couple signals to or from the conductive resonance post 40 and the conductive resonance ring 60.
  • a capacitive coupling 70 is provided to couple the signal to the conductive resonance post 40.
  • a capacitive coupling 80 is provided to couple the signal to the conductive resonance ring 60.
  • a direct coupling 90 is provided to couple the signal to the conductive resonance post 40.
  • a direct coupling 100 may be provided alternatively or in addition to the capacitive coupling 80, in order to couple the same or another signal to the conductive resonance ring 60 which will then resonate in the alternate mode to that caused by the signal coupled from the capacitive coupling 80.
  • a plurality of resonators may be arranged together, as shown in Figure 5 .
  • four resonators are provided which are arranged adjacent to each other.
  • a first resonator 10A comprises an arrangement similar to that described above, with a conductive resonance post 40 surrounded by a conductive resonance ring 60.
  • a conductive feed 90 couples with the conductive resonance post 40, whilst a capacitive feed 80 couples with the conductive resonance ring 60.
  • a tuning screw (not shown) is provided to control the resonant frequency of the conductive resonance post 40, whilst a tuning screw 110 is provided for controlling the resonant frequency of the conductive resonance ring 60.
  • Another resonator 10A' is provided which has a mirror configuration to that of resonator 10A.
  • resonators 10A and 10A' Interposed between resonators 10A and 10A' are two resonators 10B. These are of identical configuration to the resonators 10A and 10A', but without the couplings 80 and 90.
  • Apertures are formed in the walls of the conductive enclosure to facilitate electromagnetic coupling between adjacent resonators.
  • a signal can be provided to one of the two capacitive feeds 80 and a filtered signal is provided by the other.
  • the signal couples from the capacitive feed 80 into the adjacent conductive resonance ring 60 and this induces resonance in the conductive resonance ring 60 of the adjacent resonator 10B, which induces resonance in the conductive ring of the adjacent resonator 10B, which induces resonance in the conductive ring of the adjacent resonator 10A' and a filtered signal is provided out of the capacitive feed 80.
  • a signal may be provided via the conductive feed 90 to the conductive resonance post 40 and a filtered signal is provided by the other conductive feed 90.
  • the filter may be bi-directional, in that the signal may be fed into either coupling and the filtered signal obtained from the other coupling. This arrangement enables simultaneous filtering at two frequency bands to be achieved either on the same or different signals.
  • Figure 6 illustrates an example arrangement of a high order filter. This arrangement illustrates how the resonators can be arranged as an array and shows how the filtered signals can follow different paths through the high order filter.
  • the signal to be filtered at the low frequency is provided via the conductive feed 90 to the conductive resonant post labelled 1
  • apertures are formed in the conductive enclosure so that coupling occurs in the sequence illustrated by the numbering of the conductive posts; namely, that the signal passes from the conductive resonant post labelled 1 to the conductive resonant post labelled 2, then 3, then 4, then 5 and then 6.
  • the filtered signal is then retrieved via the conductive feed 90.
  • a signal is provided by the capacitive feed 80 to the conductive ring labelled 1, and then apertures in the conductive enclosure then facilitate coupling in the order 1, 2, 3, 4, 5, with the filtered signal being provided via the capacitive feed 80.
  • conductive couplings may be provided to the conductive rings in order to support the second mode, thereby enabling a further signal to be filtered at the high frequency concurrently with the other two signals.
  • these arrangements enable two electromagnetic resonances to be achieved concurrently at distinct frequencies in a single physical volume within a single metallic enclosure using coaxial cavity filter technology.
  • a conductive post and conductive ring are provided in a single cavity.
  • the centre post resonates at a quarter wavelength for the low frequency resonance, and the conductive ring resonates at full wavelength for the high frequency resonance.
  • the spatial separation of the resonance field distribution allows for independent control of input/output coupling/tuning/inter-resonator coupling.
  • the arrangement is fully symmetric in two orthogonal planes which provides for full physical symmetry of the structure which provides for increased flexibility when building a filter by locating individual resonant devices adjacent each other.
  • program storage devices e.g., digital data storage media, which are machine or computer readable and encode machine-executable or computer-executable programs of instructions, wherein said instructions perform some or all of the steps of said above-described methods.
  • the program storage devices may be, e.g., digital memories, magnetic storage media such as a magnetic disks and magnetic tapes, hard drives, or optically readable digital data storage media.
  • the embodiments are also intended to cover computers programmed to perform said steps of the above-described methods.
  • processors may be provided through the use of dedicated hardware as well as hardware capable of executing software in association with appropriate software.
  • the functions may be provided by a single dedicated processor, by a single shared processor, or by a plurality of individual processors, some of which may be shared.
  • processor or “controller” or “logic” should not be construed to refer exclusively to hardware capable of executing software, and may implicitly include, without limitation, digital signal processor (DSP) hardware, network processor, application specific integrated circuit (ASIC), field programmable gate array (FPGA), read only memory (ROM) for storing software, random access memory (RAM), and non-volatile storage. Other hardware, conventional and/ or custom, may also be included.
  • DSP digital signal processor
  • ASIC application specific integrated circuit
  • FPGA field programmable gate array
  • ROM read only memory
  • RAM random access memory
  • non-volatile storage Other hardware, conventional and/ or custom, may also be included.
  • any switches shown in the Figures are conceptual only. Their function may be carried out through the operation of program logic, through dedicated logic, through the interaction of program control and dedicated logic, or even manually, the particular technique being selectable by the implementer as more specifically understood from the context.
  • any block diagrams herein represent conceptual views of illustrative circuitry embodying the principles of the invention.
  • any flow charts, flow diagrams, state transition diagrams, pseudo code, and the like represent various processes which may be substantially represented in computer readable medium and so executed by a computer or processor, whether or not such computer or processor is explicitly shown.

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Claims (15)

  1. Ensemble résonateur, comprenant :
    un résonateur (10 ; 10A ; 10A' ; 10B) ayant un pilier de résonance conducteur (40) entouré par une enceinte conductrice (20) définissant une cavité (30), ledit pilier de résonance conducteur étant utilisable pour filtrer un signal à l'intérieur d'une première bande de fréquence (f1) ;
    caractérisé par un élément de résonance annulaire conducteur (60) positionné autour dudit pilier de résonance conducteur, ledit élément de résonance annulaire conducteur étant utilisable pour filtrer un signal à l'intérieur d'une deuxième bande de fréquence (f2) simultanément au filtrage par ledit pilier de résonance conducteur dudit signal à l'intérieur de ladite première bande de fréquence.
  2. Ensemble résonateur de la revendication 1, dans lequel ledit élément de résonance annulaire conducteur a une longueur correspondant à pas plus d'une longueur d'onde à une fréquence à l'intérieur de ladite deuxième bande de fréquence.
  3. Ensemble résonateur de la revendication 1 ou 2, dans lequel ledit pilier de résonance conducteur comprend un élément allongé s'étendant le long d'un premier axe et ledit élément de résonance annulaire conducteur comprend au moins une partie d'un élément en forme d'anneau s'étendant dans un plan, ledit plan étant orienté transversalement audit premier axe.
  4. Ensemble résonateur d'une quelconque revendication précédente, dans lequel ledit élément de résonance annulaire conducteur est positionné concentriquement avec ledit pilier de résonance conducteur.
  5. Ensemble résonateur d'une quelconque revendication précédente, dans lequel ledit pilier de résonance conducteur est relié électriquement à ladite enceinte conductrice.
  6. Ensemble résonateur d'une quelconque revendication précédente, dans lequel ledit pilier de résonance conducteur a une longueur correspondant à pas plus d'un quart de longueur d'onde à une fréquence à l'intérieur de ladite première bande de fréquence.
  7. Ensemble résonateur d'une quelconque revendication précédente, dans lequel les fréquences à l'intérieur de ladite deuxième bande de fréquence sont supérieures aux fréquences à l'intérieur de ladite première bande de fréquence.
  8. Ensemble résonateur d'une quelconque revendication précédente, dans lequel les harmoniques desdites fréquences à l'intérieur de ladite première bande de fréquence ne coïncident pas avec lesdites fréquences à l'intérieur de ladite deuxième bande de fréquences.
  9. Ensemble résonateur d'une quelconque revendication précédente, dans lequel ledit élément de résonance annulaire conducteur est utilisable pour filtrer deux signaux à l'intérieur d'une deuxième bande de fréquence simultanément au filtrage par ledit pilier de résonance conducteur dudit signal à l'intérieur de ladite première bande de fréquence.
  10. Ensemble résonateur d'une quelconque revendication précédente, comprenant une paire de sources (80, 100) positionnées orthogonalement l'une à l'autre, chacune utilisable pour acheminer un desdits deux signaux jusqu'audit élément de résonance annulaire conducteur.
  11. Ensemble résonateur d'une quelconque revendication précédente, comprenant au moins un autre élément de résonance annulaire conducteur positionné autour dudit premier pilier de résonance conducteur, chaque autre élément de résonance annulaire conducteur étant utilisable pour filtrer un signal à l'intérieur d'une bande de fréquence respective simultanément au filtrage par ledit pilier de résonance conducteur dudit signal à l'intérieur de ladite première bande de fréquence.
  12. Ensemble résonateur de la revendication 11, dans lequel chaque autre élément de résonance annulaire conducteur est utilisable pour filtrer un signal à l'intérieur de ladite deuxième bande de fréquence ou d'une autre bande de fréquence simultanément au filtrage par ledit pilier de résonance conducteur dudit signal à l'intérieur de ladite première bande de fréquence.
  13. Ensemble résonateur d'une quelconque revendication précédente, comprenant une pluralité desdits résonateurs positionnés de façon adjacente et ayant des parties partagées de ladite enceinte conductrice.
  14. Ensemble résonateur de la revendication 13, dans lequel lesdites parties partagées de ladite enceinte conductrice comprennent au moins une ouverture pour faciliter le couplage entre résonateurs adjacents.
  15. Ensemble résonateur de l'une quelconque des revendications 13 ou 14, dans lequel un de ladite pluralité de résonateurs comprend une première source de signal utilisable pour acheminer son signal jusqu'audit pilier de résonance de ce résonateur et un autre de ladite pluralité de résonateurs comprend une deuxième source de signal utilisable pour acheminer son signal jusqu'audit élément de résonance annulaire conducteur.
EP14305032.6A 2014-01-10 2014-01-10 Filtre avec résonateurs coaxiales Active EP2894709B1 (fr)

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EP2894709A1 EP2894709A1 (fr) 2015-07-15
EP2894709B1 true EP2894709B1 (fr) 2019-05-01

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DE1108824B (de) * 1956-06-18 1961-06-15 Siemens Ag Durchstimmbares, mehrkreisiges Filter fuer sehr kurze elektromagnetische Wellen
US5909159A (en) * 1996-09-19 1999-06-01 Illinois Superconductor Corp. Aperture for coupling in an electromagnetic filter
JP3633520B2 (ja) * 2001-04-04 2005-03-30 株式会社村田製作所 共振器装置、フィルタ、デュプレクサおよび通信装置
US7327210B2 (en) * 2004-06-15 2008-02-05 Radio Frequency Systems, Inc. Band agile filter
WO2009067056A1 (fr) * 2007-11-20 2009-05-28 Telefonaktiebolaget Lm Ericsson (Publ) Filtre s'utilisant dans un réseau de communication sans fil

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