EP2920840B1 - Filtre de coupure de haute fréquence - Google Patents

Filtre de coupure de haute fréquence Download PDF

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Publication number
EP2920840B1
EP2920840B1 EP13792597.0A EP13792597A EP2920840B1 EP 2920840 B1 EP2920840 B1 EP 2920840B1 EP 13792597 A EP13792597 A EP 13792597A EP 2920840 B1 EP2920840 B1 EP 2920840B1
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EP
European Patent Office
Prior art keywords
radio
blocking filter
coupling
frequency
frequency blocking
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Not-in-force
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EP13792597.0A
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German (de)
English (en)
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EP2920840A1 (fr
Inventor
Wolfgang Haeupler
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Kathrein Mobilcom Austria GmbH
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Kathrein Austria GmbH
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Publication of EP2920840A1 publication Critical patent/EP2920840A1/fr
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • H01P1/00—Auxiliary devices
    • H01P1/20—Frequency-selective devices, e.g. filters
    • H01P1/201—Filters for transverse electromagnetic waves
    • H01P1/202—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
    • H01P1/201—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
    • 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

Definitions

  • the invention relates to a high-frequency cut filter in coaxial design according to the preamble of claim 1.
  • 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.
  • 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, of which a filter passes frequencies below a frequency between transmit and receive bands and blocks frequencies above that frequency (low pass filter) and blocks the other filter frequencies below a frequency between transmit and receive bands and passes frequencies thereabove (high pass filter).
  • Other combinations of the just mentioned filter types are conceivable.
  • High-frequency filters are often constructed from coaxial resonators because they consist of milling or castings, making them easy to manufacture. In addition, these resonators ensure a high electrical quality and a relatively high temperature stability.
  • a high-frequency filter known from the prior art comprises an input terminal and an output terminal, which are galvanically connected to one another via a connecting line. Furthermore, the high-frequency filter comprises at least two coaxial resonators, which are each capacitively coupled to the connecting line, so that the resonators are also capacitively coupled to the input terminal and the output terminal.
  • the coupling points of the resonators with the connecting line must have on the connecting line a distance of one quarter of the wavelength of the high-frequency filter to be filtered center frequency signal, so that the individual resonators are resonantly coupled to each other.
  • E-GSM signals used in mobile radio use the frequency range of 880-915 MHz for the so-called uplink and the frequency range of 925-960 MHz for the so-called downlink. Due to the omission of television programs transmitted analogously via satellites, the so-called "digital dividend" in the frequency range of 790-862 MHz is accessible to mobile radio.
  • the frequency band of 791-821 MHz is used for the uplink, whereas the frequency band of 832-862 MHz is used for the downlink.
  • a high-frequency filter is for example from the US 4,276,525 known.
  • This is a conventional bandpass filter in which capacitive coupling elements are provided, coming from an input up to an output at the level of the free ends of the inner conductors (which are designed as coaxial resonators). Therefore, in such bandpass filters, the signal transmission takes place directly via the resonators, ie the resonance frequencies are within the useful frequency range.
  • a coaxial resonator is further example of the EP 0 576 273 A1 known.
  • This is a different type of resonator differs from the aforementioned prior art filter assembly.
  • the from the EP 0 576 273 A1 known type of filter comprises a dielectric block, which is longitudinally penetrated centrally by a hollow cylindrical space which is formed as a cylindrical hollow inner conductor tube.
  • a dielectric filter is also from the GB 2 234 399 A known.
  • the filter preferably comprises a plurality of resonators, which are electrically coupled to the at least one strip conductor. Spaced apart from the strip conductor, a ground surface is provided, wherein at least one resonator in the form of a coaxial resonator with an outer conductor pot and a rod-shaped inner conductor arranged coaxially in the outer conductor pot is galvanically connected to the ground surface.
  • notch filters are also known which, when constructed in a coaxial design similar to the above-explained filters, usually comprise a plurality of coaxial resonators coupled together, with a signal line from one input adjacent to the internal conductors of these resonators goes to an exit.
  • blocking filters of this type the smaller the blocking frequency, the longer the signal line between two adjacent resonators must be.
  • the length of the signal line between two resonators is often supposed to be one quarter of the wavelength of the blocking frequency. For a signal with a frequency of 790 MHz, a quarter of this wavelength is 0.1 m.
  • the distance between two inner conductors of two adjacent resonators is usually about 2 cm to 3 cm, so that the approximately 10 cm long connecting lines between adjacent resonators must be folded consuming.
  • the production of a correspondingly constructed high-frequency filter is complicated and expensive.
  • the object of the present invention is, starting from the generic state of the art, to realize an improved and simpler high-frequency filter in the form of a high-frequency blocking filter which requires no complicated laying of a connecting line through the high-frequency blocking filter and can be realized in a space-saving and cost-effective manner.
  • a high-frequency notch filter is different from a high-frequency band-pass filter by its signal transmission path.
  • the signal transmission path takes place directly via the resonators. That is, the resonance frequencies are within the useful frequency range of the high-frequency filter. In other words, the resonators oscillate with those frequencies that are to be transmitted.
  • high-frequency cutoff filters have a completely different signal transmission path.
  • the useful signal transmission takes place via a separately provided line, which usually runs continuously from an input to an output of the blocking filter according to the prior art.
  • this connecting line also referred to below as a signal line, can be brought closer to the resonators, i. an approximation to the inner conductors of the capacitive resonators is capacitively coupled. In this case, the resonators thus oscillate at a frequency which is outside the transmission frequency range which is to be transmitted via the connecting line.
  • the connecting or signal line which is continuous in the prior art in the case of a high-frequency blocking filter now has at least one or more galvanic separation points, which are designed as capacitive separation points in this line. These capacitive separation points are also capacitively coupled to individual resonators. As a result, a significant reduction in the size of corresponding high-frequency cut filter in coaxial design is possible. Because of the galvanic separation points in the form of the aforementioned coupling capacitance, a phase shift of the signal on the connecting line is made possible, which corresponds to the effect of a shortened continuous connecting line.
  • the invention thus comprises a signal line running through the high-frequency cutoff filter, which is provided with at least one or more galvanic separation points (corresponding to the number of resonators), wherein the resonators are arranged by means of one each at the separation point and with two free ends the connecting line connected coupling capacity are interconnected. It is therefore sometimes spoken of capacitive separation points.
  • the signal line thus comprises two galvanically separated line sections.
  • the input terminal and the output terminal are through the connected between the line sections coupling capacitance connected to each other.
  • the capacitive coupling of the respective resonators with the signal line and thus with the input terminal and the output terminal is realized in that the signal line in the region of the respective inner conductor of the respective resonators each having a further coupling surface.
  • the length of the signal line between the coupling points of the at least two resonators with the signal line be shortened, since the coupling capacitance leads to a phase shift of the signal to be filtered, wherein the phase shift of the signal has the same effect as transmitting the signal to be filtered via a corresponding long connection line, ie a correspondingly long signal line.
  • the inventive compound of the resonators on the coupling capacitance, which is arranged at the separation point of the connecting line, thus not only reduces the length of the necessary signal line but the high-frequency cut filter according to the invention are made very compact and yet simple and therefore inexpensive.
  • the inner conductors preferably extend from the housing bottom perpendicularly in the direction of the housing cover.
  • the inner conductors are preferably designed as inner conductor tubes. This makes it possible that in the correspondingly formed cavity of the inner conductor tube, a tuning element can be introduced distance variable, so that the high-frequency filter is tuned.
  • the connecting line comprises at least two line sections, which are galvanically separated from one another at the separation point of the connecting line.
  • a first line section is galvanically connected to the input terminal and / or capacitively coupled and comprises a first coupling surface
  • a second line section is galvanically connected to the output terminal and / or capacitively coupled and comprises a second coupling surface.
  • the first coupling surface and the second coupling surface are at least one another partially opposite such that the first coupling surface and the second coupling surface form the coupling capacity.
  • a correspondingly constructed high-frequency filter is particularly simple in its construction.
  • the coupling surfaces of the respective line sections may be aligned parallel to the longitudinal extent of the high-frequency filter and parallel to the height extent of the respective inner conductors of the resonators. This makes the geometry of a correspondingly constructed high-frequency filter particularly simple.
  • the size of the respective coupling surfaces of the respective line sections can be easily adapted by simply replacing the corresponding line sections, wherein the line sections have at their respective ends adapted to the requirements large coupling surfaces.
  • the line sections are offset parallel to each other and the first coupling surfaces and the second coupling surfaces arranged offset parallel to each other.
  • the positioning of the respective coupling surfaces with each other is particularly easy.
  • the distance of the coupling surfaces to each other is easily adjustable.
  • a partition wall comprising a dielectric material is arranged between the first coupling surface and the second coupling surface.
  • the capacitance of a correspondingly formed coupling capacitance can be influenced by selecting the dielectric material.
  • the high-frequency filter further comprises a holding and / or receiving device, which is supported on the inner conductor and / or fastened to the inner conductor and has two pocket-shaped receiving spaces, which are separated by a partition wall.
  • the first coupling surface is arranged in a first receiving space of the holding and / or receiving device
  • the second coupling surface is arranged in a second receiving space of the holding and / or receiving device.
  • the attachment of the respective line sections to the inner conductor is particularly simple. Furthermore, the arrangement of the respective line sections and consequently the respective coupling surfaces to each other by the holding and / or receiving device is particularly simple, since the corresponding coupling surfaces must be easily inserted into the space provided receiving spaces or receiving pockets of the holding and / or receiving device.
  • the holding and / or receiving device can either be easily supported on the respective inner conductors of the resonators. Furthermore, it is also possible that the holding and / or receiving device is connected, for example, by a bond with the inner conductors or attached thereto.
  • the respective second coupling surfaces of the line sections are preferably arranged opposite the respective inner conductors, so that the respective resonators are capacitively coupled to the respective line sections. Between the respective second coupling surfaces and the respective inner conductors while a support wall of the holding and / or receiving device is arranged.
  • the capacitive coupling of the resonators with the respective line sections is achieved in a structurally particularly simple manner. Furthermore, by selecting the material of the support wall, which is arranged between the inner conductors and the second coupling surfaces, the capacitive coupling between the coupling surfaces and the inner conductors can be adjusted.
  • the high-frequency filter further comprises a further connection.
  • This additional connection can also be referred to as the send / receive connection.
  • the further connection is arranged between the input connection and the output connection and is galvanically connected to the connection line.
  • the further connection between coupling points of the resonators is arranged with the connecting line.
  • this can form a duplex switch in a corresponding embodiment of the resonators.
  • the input terminal may be provided for a transmitter, whereas the output terminal may be provided for a receiver.
  • the further connection or the transmission / reception connection can then be connected to an antenna which is provided and designed for the transmission and reception of signals.
  • At least two resonators are capacitively coupled to the connection line between the further connection and the input connection. Furthermore, at least two resonators are also capacitively coupled to the connecting line between the further connection and the output connection.
  • the high-frequency blocking filter By means of a corresponding design of the high-frequency blocking filter, it can have a high attenuation over a wide frequency range, so that a wider frequency range can be blocked by the correspondingly constructed high-frequency blocking filter.
  • the high-frequency cutoff filter according to the invention preferably operates in the range between 790 MHz to 862 MHz and / or in the range between 880 MHz to 960 MHz and / or in the range of the 1800 MHz mobile frequency and / or the 2000 MHz mobile frequency.
  • This high-frequency filter 1 is hereinafter referred to above all as high-frequency blocking filter 1, since it is a blocking filter. It comprises an outer conductor housing with a housing bottom 11 and a housing cover 11 which is at a distance from the housing bottom 11 and arranged opposite to it, and which is only in the housing cover 11 FIG. 7 is shown.
  • the outer conductor housing in this case comprises the so-called resonator interior 10a.
  • the high frequency blocking filter is shown with the housing cover 12 removed. Between the housing bottom 11 and the housing cover 12, a housing wall 13 is provided circumferentially. That in the FIGS. 1 to 8 shown high-frequency cutoff filter 1 comprises six resonators 10, which are separated from each other by partitions 14.
  • the six resonators 10 each comprise an inner conductor 16, wherein the inner conductors 16 are each electrically connected to the housing bottom 11 and extend perpendicularly from the housing bottom 11 in the direction of the housing cover 12.
  • the outer conductor housing may be formed integrally with the inner conductors 16, for example as a milling, turning or casting.
  • the respective inner conductors 16 end in each case at a distance in front of Housing cover 12.
  • the respective inner conductor 16 may extend to the housing cover 12, which then have to be electrically isolated from the housing cover 12 by an insulating layer.
  • the high-frequency cutoff filter 1 comprises an input terminal 20, an output terminal 30 and a further terminal 40 in the form of a transmitting / receiving terminal 40.
  • This transmitting and receiving port thus has a dual function as the output and input port.
  • the input terminal 20, the output terminal 30 and the transmitting / receiving terminal 40 are coupled to each other via a (continuous) connection line 50, that is connected, which is also referred to below as the signal line 50. Via this signal line corresponding high-frequency signals are transmitted in the passband, whereby the so-called passband is ultimately defined or defined.
  • the so-called high-frequency blocking frequency is also generated by the resonators, that is to say that band-stop filter in whose frequency range a signal transmission can not take place.
  • the transmission / reception port 40 is disposed between the input port 20 and the output port 30.
  • the input terminal 20, the output terminal 30 and the transmitting / receiving port 40 are each formed as a coaxial connection, wherein the respective outer conductor to the outer conductor housing and the respective inner conductor to the connecting line 50 are electrically connected.
  • the resonators are usually not directly coupled, but only about the signal line 50.
  • the individual resonators are each preferably in the correct phase, for example coupled capacitively. In an optimal arrangement, it is then possible to detune or change the individual Sperrpolfrequenzen a respective resonator without affecting the remaining Sperrpole (resonators).
  • the signal line 50 passes from the one end of the input terminal 20 closer to the high-frequency notch filter 1 to the output terminal 30 adjacent the opposite end of the notch filter 1, passing through all the resonators 10, ie through all the resonator interiors 10a.
  • recesses or openings 14a are formed in the partition walls 40 separating the individual resonators from one another in the area and at the height of the connecting line, through which the connecting line 50 extends (electrically isolated from the partitions 40).
  • the line section 51 comprises a first coupling surface 51.1 facing the output connection 30 and a second coupling surface 51.2 facing the input connection 20.
  • the line section 52 comprises a first coupling surface 52.1 facing the output connection 30 and a second coupling surface facing the input connection 20 52.2.
  • the line section 53 comprises a first coupling 53.1 facing the outlet connection 30 and a second coupling surface 53.2 facing the inlet connection 20.
  • the line section 54 in turn comprises three second coupling surfaces 54.2.
  • first coupling surfaces 51.1, 52.1, 53.1 and second coupling surfaces 51.2, 52.2, 53.2 and 54.2 run parallel to a longitudinal extent of the outer conductor housing of the high-frequency blocking filter 1.
  • the line sections 51, 52, 53, 54 are parallel to one another and offset relative to one another such that the first coupling surface 51.1 of the line section 51 faces the second coupling surface 52.2 of the line section 52.
  • first coupling surface 51.1 faces the second coupling surface 52.2, these two coupling surfaces form a capacitive separation point 60 'in the form of a first coupling capacitance 60, which is arranged at this capacitive separation point between the two line sections 51 and 52, and which are shown in FIGS the leftmost two resonators 10 capacitively interconnects.
  • FIG. 8 upper side housing wall 13 smaller by the same amount. But since the coupling distances between the individual line sections and the respective inner conductor 16 remain the same (should be the same), is off FIG. 8 It can also be seen that the inner conductor from the first to the fourth resonator in different relative position between the two parallel housing walls 13 extending in the longitudinal direction. In this case, the inner conductors perform the same lateral offset, with which the successive line sections are arranged with respect to each other in question, caused by the coupling section lateral offset.
  • the first coupling surface 52.1 of the line section 52 faces the second coupling surface 53.2 of the line section 53 in such a way that the first coupling surface 52.1 and the second coupling surface 53.2 form a further coupling capacitance 60 capacitively interconnecting the second and third resonators 10 counted in the figures from the left coupled.
  • first coupling surface 53.1 of the line section 53 of the second coupling surface 54.2 of the line section 54 is arranged opposite, so that the first coupling surface 53.1 and the second coupling surface 54.2 form a further coupling capacitance 60 which corresponds to the on the left of counted third and fourth resonators 10 capacitively coupled with each other.
  • the fourth, fifth and sixth resonators 10 counted from the left in the figures are not coupled to one another via separate coupling capacitances 60, but the individual resonators 10 are coupled to one another only via the line section 54.
  • the line sections 51, 52, 53, 54 each have second coupling surfaces 51.2, 52.2, 53.2, 54.2, which are arranged opposite the respective inner conductors 16 of the resonators 10, so that the respective resonators 10 or the inner conductor 16 with the corresponding line sections 51 , 52, 53, 54 are capacitively coupled, namely via the so-called capacitive internal conductor or resonator coupling 65.
  • the high-frequency blocking filter 1 comprises a number of holding and / or receiving devices 70 corresponding to the number of resonators 10.
  • the positioning of the holding and / or receiving devices 70 with respect to the respective inner conductors 16 of the resonators 10 is exemplary in the FIGS. 4a and 4b shown.
  • the holding and / or receiving device 70 comprises a support wall 74, by means of which the holding and / or receiving device 70 is in direct contact with the inner conductor 16, or which is arranged at a small distance from the inner conductor 16 spaced.
  • the corresponding line sections 51, 52, 53, 54 and the respective associated coupling surfaces 51.2, 52.2, 53.2, 54.2 of the signal line 50 in the lateral distance are arranged to the respective inner conductors 16 of the resonators 10. Since the corresponding line sections 51, 52, 53, 54 are designed strip-shaped, ie transverse to the longitudinal direction of the lines have a more or less rectangular cross-section (ie at least two parallel side surfaces 50, which are aligned in the embodiment shown also parallel to the inner conductors), be formed by the correspondingly dimensioned cooperating coupling surfaces on the galvanic separation points without additional measures.
  • the line sections form at the galvanic separation points, the so-called capacitive separation points 60 'with the respectively associated end portions of the line sections, which form the coupling surfaces of a coupling capacitance formed thereby.
  • the mentioned holding and / or receiving device 70 is supported on the upper free end 16 a of the inner conductor 16 and / or fixed to the inner conductor 16.
  • the attachment of the holding and / or receiving device 70 to the inner conductor 16 may be realized, for example by gluing.
  • the holding and / or receiving device 70 has two receiving spaces 72, 73, which are separated from one another by a partition wall 71.
  • the first coupling surface 52.1 of the line section 52 is arranged in a first receiving space 72 of the holding and / or receiving device 70
  • the second coupling surface 53.2 of the line section 53 is arranged in a second receiving space 73 of the holding and / or receiving device 70.
  • the line sections 51, 52, 53, 54 are each arranged in the region of the upper free ends 16 a of the corresponding inner conductor 16. It can be seen from the drawings that extend the line sections with their parallel to the inner conductor height sections then also from the upper free end 16a of the inner conductor 16, starting over a certain vertical distance parallel to the inner conductor 16 down toward housing bottom 11, but preferably only in a range of not more than 10% or 20% or up to 30% of the axial length of the inner conductor 16. In this height range relative to the inner conductor 16 and the aforementioned recesses or openings 14a are then formed at the partitions 14, about which Connecting line at the same height or at the same distance from the housing cover 12 and the housing bottom runs.
  • the holding and / or receiving device 70 is preferably made of a dielectric material, in particular a plastic. After attaching the respective holding and / or receiving devices 70 to the respective inner conductors 16, the respective line sections 51, 52, 53, 54 with demounted housing cover 12 from above into the corresponding receiving spaces 72, 73, which are formed as receiving pockets, are pushed. Thereby, the positioning of the line sections 51, 52, 53, 54 to each other and to the inner conductors 16 in a very simple manner possible, so that the desired resonance properties of the respective resonators 10 and thus the filter characteristics of the high-frequency blocking filter 1 are always relatively easily achieved because the positions of the line sections through the holding and / or receiving device 70 are determined.
  • the respective second coupling surfaces 51.2, 52.2, 53.2 and 54.2 are arranged opposite the respective inner conductors 16.
  • the resonators 10 and / or the inner conductors 16
  • the respective line sections 51, 52, 53, 54 capacitive inner conductor and / or resonator coupling 65.
  • the upper end 16a of an inner conductor 16 partially overlapping support wall 74 (FIG. FIG. 4b ) of a corresponding holding and / or receiving device 70.
  • the capacitive coupling 65 (ie, the so-called capacitive inner conductor coupling 65, which is sometimes called capacitive resonator coupling 65) of the respective second coupling surface 51.2, 52.2, 53.2, 54.2 with the Inner conductors 16 influenced by the material selection of the support wall 74.
  • the mutual coupling of the resonators 10 used in the notch filter is not effected by a direct coupling between the resonators, but only via the signal line 50. Therefore, no otherwise conventional coupling window or coupling diaphragms are provided between the individual resonators.
  • the coupling of the resonators via the signal line 50 is preferably carried out in each case in the correct phase, for example by the capacitive coupling. With optimal arrangement then the individual Sperrpolfrequenzen detuned or changed without affecting the remaining locking poles.
  • the explained inventive construction of the high-frequency cut filter usually includes a plurality of coaxial resonators 10, wherein adjacent and z. B. capacitive coupled to the inner conductor 10 of these resonators, the signal line 50 between two terminals 20, 30, 40 extends.
  • FIG. 10 shows an equivalent circuit diagram of the in FIGS. 1 to 8 shown high frequency blocking filter 1.
  • the transmitting / receiving port 40 is connectable to an antenna, not shown in the figures. Via the antenna, not shown, output signals can both be sent and received signals can be received.
  • a transmitter not shown in the figures can be connected, and to the output terminal 30, a receiver not shown in the figures can be connected.
  • E-GSM signals used in mobile radio use the frequency range from 880 to 915 MHz for the so-called uplink and the frequency range from 925 to 960 MHz for the so-called downlink.
  • the transmitter operates in the frequency range 880-915 MHz.
  • the duplexer 1 is then designed such that the three resonators 10 between the input terminal 20 and the transmitting / receiving terminal 40 are designed in their size and their geometry such that these three coupled resonators 10 signals in the frequency domain from 880 to 915 MHz, but strongly attenuate signals in the frequency range of 925 to 960 MHz.
  • the three resonators 10 between the output terminal 30 and the transmitting / receiving terminal 40 in turn are designed in size and geometry such that these signals in the frequency range of 925 to 960 MHz pass, whereas signals in the frequency range from 880 to 915 MHz strongly attenuated, So be locked.
  • a signal introduced from the transmitter into the duplex switch 1 via the input terminal 20 is forwarded to the transmitting / receiving terminal 40, whereas this signal is attenuated by the three resonators 10 between the transmitting / receiving terminal 40 and the output terminal 30, so that the signal does not reach the output terminal 30.
  • the signal fed from the transmitter into the duplexer 1 is emitted via the antenna (not shown), but does not pass via the output terminal 30 to the receiver (not shown) of the high-frequency blocking filter 1 thus formed.
  • the receiving branch is separated from the transmitting branch by the corresponding high-frequency blocking bands or blocking regions, so that over-coupling is avoided.
  • Signals received by the antenna in the range of 925 to 960 MHz are fed to the duplex switch 1 via the transmission / reception port 40. These signals are forwarded via the three resonators 10 between the transmit / receive port 40 and the output port 30 to the receiver. However, these signals are so much attenuated by the three resonators between the transmit / receive port 40 and the input port 20 that they do not pass through the input port 20 to the transmitter.
  • the transmitter operates in the frequency range 880-915 MHz.
  • the spacing of the coupling points of adjacent resonators to the connecting line 50 must be a distance of ⁇ / 4 of the center frequency of this frequency band.
  • the three resonators 10 facing the output terminal 30, which are arranged between the transmitting / receiving terminal 40 and the output terminal 30, have a passband of 925 to 960 MHz, so that the distance between the coupling point of adjacent resonators 10 to the connecting line 50 is smaller, so that the connecting lines or the corresponding line sections between the respective resonators can be made shorter than in the case of the three resonators 10 facing the transmitter.
  • the coupling capacitances described above are between them 60 arranged. These coupling capacitances 60 cause a phase shift of the signal.
  • the sum of this phase shift with the phase shift corresponding to the transit time of the signal via the line sections 51, 52, 53 corresponds to the phase shift of an electrical line with a length of, for example, ⁇ / 4 of the center frequency signal.
  • the line section 54 which couples the three resonators 10 between the transmit / receive port 40 and the output port 30, has no corresponding coupling capacitances 60, since the distance between the coupling point of two adjacent resonators 10 to the line section 54 is smaller, so that no coupling capacity 60 must be used for effective extension of the line section 54. From the FIGS. 1 . 3 and 5 to 7 However, it can be seen that the line section 54 is not straight but meander-shaped, so that the distances of the coupling points of two adjacent resonators 10 are just ⁇ / 4 for center frequency signals in the band from 925 to 960 MHz.
  • FIG. 9 shows an equivalent circuit diagram of a high-frequency cutoff filter according to the invention with a continuous signal line 50 (and the switched in the continuous signal line 50 coupling capacitor 60), which has only two resonators 10 which are capacitively connected to each other via a coupling capacitance 60.
  • a corresponding high-frequency blocking filter 1 or a corresponding duplexer 1 has narrower blocking regions for the uplink and downlink, since only one resonator 10 is provided for the uplink and the downlink.
  • shown high-frequency cut filter 1 is identical to the operation of the reference to the FIGS. 1 to 8 and 10 described high-frequency blocking filter. 1
  • the desired blocking poles which are located outside the transmission frequency range, then arise in the case of phase-correct coupling.
  • the in-phase Sperrpolkopplung can be adjusted by an optimized combination between the individual cable lengths between the capacitive separation points and the size of the capacitance at the separation points themselves.

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Claims (19)

  1. Filtre de coupure de haute fréquence à structure coaxiale, le filtre de coupure de haute fréquence présentant les caractéristiques suivantes :
    - le filtre de coupure de haute fréquence (1) comprend un boîtier pour conducteurs externes présentant un fond de boîtier (11) et un couvercle de boîtier (12) disposé à l'opposé du fond de boîtier (11) en étant espacé de celui-ci, une paroi de boîtier (13) périphérique étant prévue entre eux ;
    - le filtre de coupure de haute fréquence (1) comprend au moins deux résonateurs (10), comprenant chacun un conducteur interne (16) ;
    - les conducteurs internes (16) sont chacun reliés par voie galvanique au fond de boîtier (11) et s'étendent en direction du couvercle de boîtier (12) à partir du fond de boîtier (11) ;
    - les conducteurs internes (16) se terminent chacun à quelque distance du couvercle de boîtier (12) et/ou sont séparés du couvercle de boîtier (12) par voie galvanique ;
    - le filtre de coupure de haute fréquence (1) comprend une borne d'entrée (20, 40) et une borne de sortie (30, 40), le fil de signaux (50) étant relié par voie galvanique ou bien couplé de manière capacitive à la borne d'entrée (20, 40) d'une part et à la borne de sortie (30, 40) d'autre part,
    caractérisé en ce que :
    - le fil de signaux (50) s'étend en formant un couplage capacitif de conducteur interne et/ou de résonateur (65) respectif sur le conducteur interne (16) respectif en traversant les résonateurs (10) du filtre de coupure de haute fréquence (1),
    - le fil de signaux (50) présente au moins un point de séparation galvanique sous la forme d'un point de séparation capacitif (60'),
    - le point de séparation capacitif (60') est situé à distance des conducteurs internes (16) et est couplé de manière capacitive avec ceux-ci,
    - les résonateurs (10) ou conducteurs internes (16) sont respectivement couplés au fil de signaux (50) de manière capacitive,
    - le filtre de coupure de haute fréquence (1) comprend en outre un dispositif de support et/ou de réception (70) en appui sur le conducteur interne (16) et/ou fixé sur le conducteur interne (16) et présente deux espaces de réception (72, 73) séparés l'un de l'autre par une paroi de séparation (71) ; et
    - une première surface de couplage (51.1, 52.1, 53.1) est disposée dans un premier espace de réception (72) du dispositif de support et/ou de réception (70), et une deuxième surface de couplage (51.2, 52.2, 53.2, 54.2) est disposée dans un deuxième espace de réception (73) du dispositif de support et/ou de réception (70).
  2. Filtre de coupure de haute fréquence selon la revendication 1, caractérisé en ce que l'au moins un point de séparation capacitif (60') est prévu dans le fil de signaux (50) avec un écart latéral par rapport au conducteur interne (16), de préférence à proximité de l'extrémité supérieure (16a) du conducteur interne (16).
  3. Filtre de coupure de haute fréquence selon la revendication 1 ou 2, caractérisé en ce que, au niveau du point de séparation capacitif (60'), le fil de signaux (50) à séparation galvanique présente respectivement une première surface de couplage (51.1, 52.1, 53.1) et une deuxième surface de couplage (52.2, 53.2, 54.2), moyennant quoi les deux sections à séparation galvanique du fil de signaux (50) sont couplées l'une à l'autre de manière capacitive.
  4. Filtre de coupure de haute fréquence selon l'une des revendications 1 à 3, caractérisé en ce que le fil de signaux (50) est conçu en forme de bande en présentant une section transversale rectangulaire par rapport au sens de son étendue.
  5. Filtre de coupure de haute fréquence selon l'une des revendications 1 à 4, caractérisé en ce que les conducteurs internes (16) sont respectivement conçus sous la forme de tubes conducteurs internes (16).
  6. Filtre de coupure de haute fréquence selon l'une des revendications précédentes, caractérisé en ce que :
    - le fil de signaux (50) comprend au moins deux sections conductrices (51, 52, 53, 54) qui sont séparées l'une de l'autre par voie galvanique au niveau du point de séparation capacitif (60') du fil de signaux (50) ;
    - une première section conductrice (51, 52, 53) est reliée par voie galvanique et/ou couplée de manière capacitive avec la borne d'entrée (20, 40) et comprend une première surface de couplage (51.1, 52.1, 53.1) ;
    - une deuxième section conductrice (52, 53, 54) est reliée par voie galvanique et/ou couplée de manière capacitive avec la borne de sortie (30, 40) et comprend une deuxième surface de couplage (52.2, 53.2, 54.2) ; et
    - la première surface de couplage (51.1, 52.1, 53.1) et la deuxième surface de couplage (52.2, 53.2, 54.2) du point de séparation capacitif (60') sont au moins partiellement en vis-à-vis l'une de l'autre de manière que la première surface de couplage (51.1, 52.1, 53.1) et la deuxième surface de couplage (52.2, 53.2, 54.2) constituent la capacité de couplage (60).
  7. Filtre de coupure de haute fréquence selon la revendication 6, caractérisé en ce que les sections conductrices (51, 52, 53, 54) sont disposées parallèlement les unes aux autres de manière décalée et les premières surfaces de couplage (51.1, 52.1, 53.1) et les deuxièmes surfaces de couplage (52.2, 53.2, 54.2) sont disposées parallèlement les unes aux autres de manière décalée.
  8. Filtre de coupure de haute fréquence selon la revendication 6 ou 7, caractérisé en ce qu'une paroi de séparation (71) comprenant un matériau diélectrique est disposée entre la première surface de couplage (51.1, 52.1, 53.1) et la deuxième surface de couplage (52.2, 53.2, 54.2).
  9. Filtre de coupure de haute fréquence selon l'une des revendications 1 à 8, caractérisé en ce que :
    - les deuxièmes surfaces de couplage (51.2, 52.2, 53.2, 54.2) respectives sont disposées en face des conducteurs internes (16) respectifs, si bien que les conducteurs internes (16) et/ou résonateurs (10) respectifs sont couplés de manière capacitive aux sections conductrices (51, 52, 53, 54) respectives en formant un couplage capacitif de conducteur interne et/ou de résonateur (65), et
    - une paroi de portée (74) du dispositif de support et/ou de réception (70) est disposée entre les deuxièmes surfaces de couplage (51.2, 52.2, 53.2, 54.2) respectives et les conducteurs internes respectifs.
  10. Filtre de coupure de haute fréquence selon l'une des revendications précédentes, caractérisé en ce que les résonateurs (10) présentent des tailles différentes.
  11. Filtre de coupure de haute fréquence selon l'une des revendications précédentes, caractérisé en ce qu'au moins certains des conducteurs internes (16) des résonateurs (10) respectifs présentent des écarts différents par rapport à la paroi de boîtier (13).
  12. Filtre de coupure de haute fréquence selon l'une des revendications précédentes, caractérisé en ce que les sections conductrices (52, 53, 54) du fil de signaux (50) sont orientées parallèles aux parois de boîtier (13) dirigées dans le sens longitudinal, et en ce qu'au moins deux sections conductrices (52, 53, 54) successives sont disposées selon un décalage latéral l'une par rapport à l'autre en formant un écart de couplage à proximité du point de séparation capacitif (60'), et en ce que les conducteurs internes (16) qui y sont couplés sont disposés avec un décalage latéral correspondant par rapport aux parois de boîtier (13).
  13. Filtre de coupure de haute fréquence selon l'une des revendications précédentes, caractérisé en ce que le couvercle de boîtier (12) est conçu sous la forme d'une platine dont le côté intérieur de résonateur est métallisé.
  14. Filtre de coupure de haute fréquence selon l'une des revendications précédentes, caractérisé en ce que le boîtier pour conducteurs externes est conçu d'un seul tenant avec les conducteurs internes (16), notamment sous la forme d'une pièce fraisée, tournée ou moulée.
  15. Filtre de coupure de haute fréquence selon l'une des revendications précédentes, caractérisé en ce que le boîtier pour conducteurs externes et/ou le conducteur interne (16) sont conçus en plastique, les différentes surfaces internes étant métallisées.
  16. Filtre de coupure de haute fréquence selon l'une des revendications précédentes, caractérisé en ce que :
    - le filtre de coupure de haute fréquence (1) comprend en outre une borne supplémentaire (40) ;
    - la borne supplémentaire (40) est située entre la borne d'entrée (20) et la borne de sortie (30) et est reliée par voie galvanique au fil de signaux (50) ; et
    - la borne supplémentaire (40) est agencée entre des points de couplage des conducteurs internes (16) ou résonateurs (10) avec le fil de signaux (50).
  17. Filtre de coupure de haute fréquence selon la revendication 16, caractérisé en ce que les résonateurs (10) sont conçus et couplés de manière à former un duplexeur.
  18. Filtre de coupure de haute fréquence selon la revendication 16 ou 17, caractérisé en ce que :
    - au moins deux résonateurs (10) sont couplés de manière capacitive avec le fil de signaux (50) entre la borne supplémentaire (40) et la borne d'entrée (20) ; et
    - au moins deux résonateurs (10) sont couplés de manière capacitive avec le fil de signaux (50) entre la borne supplémentaire (40) et la borne de sortie (30).
  19. Filtre de coupure de haute fréquence selon l'une des revendications précédentes, caractérisé en ce que le filtre de coupure de haute fréquence (1) fonctionne, avec sa région de coupure et sa bande passante, entre 790 MHz et 862 MHz et/ou dans la plage située entre 880 MHz et 960 MHz et/ou dans la plage de fréquence de téléphonie mobile de 1800 MHz et/ou dans la plage de fréquence de téléphonie mobile de 2000 MHz.
EP13792597.0A 2012-11-15 2013-11-14 Filtre de coupure de haute fréquence Not-in-force EP2920840B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102012022433.8A DE102012022433A1 (de) 2012-11-15 2012-11-15 Hochfrequenzfilter
PCT/EP2013/003438 WO2014075805A1 (fr) 2012-11-15 2013-11-14 Filtre de coupure de haute fréquence

Publications (2)

Publication Number Publication Date
EP2920840A1 EP2920840A1 (fr) 2015-09-23
EP2920840B1 true EP2920840B1 (fr) 2016-10-05

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Application Number Title Priority Date Filing Date
EP13792597.0A Not-in-force EP2920840B1 (fr) 2012-11-15 2013-11-14 Filtre de coupure de haute fréquence

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US (1) US9923254B2 (fr)
EP (1) EP2920840B1 (fr)
DE (1) DE102012022433A1 (fr)
WO (1) WO2014075805A1 (fr)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112768862A (zh) * 2020-12-30 2021-05-07 罗森伯格技术有限公司 耦合结构、合路器、双工器以及滤波器

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4276525A (en) * 1977-12-14 1981-06-30 Murata Manufacturing Co., Ltd. Coaxial resonator with projecting terminal portion and electrical filter employing a coaxial resonator of that type
JPS5535560A (en) * 1978-09-04 1980-03-12 Matsushita Electric Ind Co Ltd Coaxial type filter
GB2234399B (en) 1989-06-21 1993-12-15 Murata Manufacturing Co Dielectric filter
FI911798A (fi) * 1991-04-12 1992-10-13 Lk Products Oy Keramisk filterkonstruktion
DE69323660T2 (de) 1992-06-26 1999-10-21 Sanyo Electric Co., Ltd. Koaxialer Resonator und dielektrisches Filter mit einem derartigen Resonator
US5329687A (en) * 1992-10-30 1994-07-19 Teledyne Industries, Inc. Method of forming a filter with integrally formed resonators
JPH098506A (ja) * 1995-06-21 1997-01-10 Matsushita Electric Ind Co Ltd 帯域阻止フィルタ
JPH1065467A (ja) 1996-08-22 1998-03-06 Matsushita Electric Ind Co Ltd フィルタ付き低雑音増幅器
FI113578B (fi) * 1999-03-03 2004-05-14 Filtronic Lk Oy Resonaattorisuodatin
DE102004045006B4 (de) 2004-09-16 2006-09-28 Kathrein-Austria Ges.M.B.H. Hochfrequenzfilter
JP4395100B2 (ja) * 2005-05-25 2010-01-06 八木アンテナ株式会社 Ｔｅｍモード誘電体フィルタ

Also Published As

Publication number Publication date
EP2920840A1 (fr) 2015-09-23
US9923254B2 (en) 2018-03-20
US20150303543A1 (en) 2015-10-22
WO2014075805A1 (fr) 2014-05-22
DE102012022433A1 (de) 2014-05-15

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