EP2071660A1 - Filtre passe-haut - Google Patents

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Publication number
EP2071660A1
EP2071660A1 EP08017065A EP08017065A EP2071660A1 EP 2071660 A1 EP2071660 A1 EP 2071660A1 EP 08017065 A EP08017065 A EP 08017065A EP 08017065 A EP08017065 A EP 08017065A EP 2071660 A1 EP2071660 A1 EP 2071660A1
Authority
EP
European Patent Office
Prior art keywords
pass filter
filter according
inner conductor
series
impedance
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP08017065A
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German (de)
English (en)
Inventor
Wolfgang Beerwerth
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Telegaertner Karl Gaertner GmbH
Original Assignee
Telegaertner Karl Gaertner GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Telegaertner Karl Gaertner GmbH filed Critical Telegaertner Karl Gaertner GmbH
Publication of EP2071660A1 publication Critical patent/EP2071660A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01P—WAVEGUIDES; RESONATORS, LINES, OR OTHER DEVICES OF THE WAVEGUIDE TYPE
    • 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
    • H01P1/2007—Filtering devices for biasing networks or DC returns

Definitions

  • the invention relates to a high-pass filter comprising a signal line with a plurality of capacitors connected in series and a ground line, wherein a plurality of inductances are connected between the signal line and the ground line.
  • Such high-pass filters are used, for example, in communications technology, in particular in mobile radio technology.
  • they may be connected between an antenna and a signal processor and ensure that signals within a first frequency range of relatively low frequency are very much attenuated, whereas signals within a relatively high frequency second frequency range experience only minimal attenuation.
  • the signals of the first frequency range can be virtually hidden.
  • High-frequency signals are usually transmitted by means of coaxial cables, which have an inner conductor and an outer conductor surrounding the inner conductor, an insulation layer being arranged between the inner conductor and the outer conductor.
  • a low-pass filter in which therefore signals with a relatively low frequency experience only a very low attenuation, whereas signals with a high frequency are subject to a very strong attenuation and are therefore practically hidden, was in the DE 32 07 422 A1 already proposed to postpone the distance between the inner conductor of the insulating layer determining additional elements on the inner conductor, which increase its capacity and thereby between the inner conductor and the outer conductor form a capacitor, whereas the inner conductor itself forms an inductance in the region between two capacity-increasing additional elements.
  • a low pass can be formed in a structurally simple manner in coaxial design.
  • Object of the present invention is to design a high-pass filter of the type mentioned in coaxial design.
  • a high-pass filter of the generic type in that the signal line forms an inner conductor and the ground line forms an outer conductor of a coaxial conductor, between which an insulation layer is arranged, and in that the inductors are configured as discrete components spaced apart from one another at least one impedance is switched.
  • At least two inductors are used in the high-pass filter according to the invention, which are formed as discrete electrical components, via which the inner conductor is in electrical connection with the outer conductor. To ensure that the inductors do not significantly affect each other, they are spaced apart with the interposition of at least one impedance.
  • at least two capacitors are used, which are connected in series with one another in the inner conductor.
  • the high-pass filter according to the invention thus has at least two LC elements connected in series and additionally at least one impedance which ensures a decoupling of the two inductances and in series with the capacitances is switched. It has been found that this can be configured in a structurally simple manner, a high-pass filter in a coaxial design.
  • At least one inductance is designed as a spiral-shaped coil. This can extend from the inner conductor radially outwards in the direction of the outer conductor. It can be provided that the outer end of the spiral coil is directly connected to the outer conductor, so that there is a galvanic connection between the spiral coil and the outer conductor.
  • the at least one impedance arranged between the inductors is preferably designed as a line section of the inner conductor. Discrete electrical components for providing impedance can thereby be dispensed with.
  • capacitors connected in series to one another in the inner conductor are identical in terms of their electrical and / or mechanical properties.
  • Pipe capacitors have at least one tubular or sleeve-shaped, electrically conductive layer as well as a likewise tubular or sleeve-shaped dielectric surrounding a further electrically conductive layer.
  • the high-pass filter has at least one pi-element with a pair of inductances, which are connected between the inner and the outer conductor, wherein between the two inductances in the inner conductor, a first capacitance, an impedance and a second Capacitance are connected in series with each other.
  • the two capacitances of the at least one Pi element are identical in their electrical and / or mechanical properties.
  • the two capacitances of the at least one Pi element are designed as plate or tube capacitors.
  • the impedance connected between the two capacitances of the at least one pi-element is preferably designed as a line section of the inner conductor.
  • the line section of the inner conductor interconnecting the two capacitances of the Pi element carries a front and a rear, electrically conductive contact sleeve which receives a dielectric insulating sleeve, into which an end section of a further line section of the inner conductor is inserted.
  • a contact sleeve in combination with an insulating sleeve and an end piece of a further line section forms one of the two series-connected capacitances of the Pi element.
  • this has two Pi elements which are connected to one another via an impedance.
  • Each of the two Pi elements has two inductances each, which are connected to each other via two capacitors and one impedance.
  • the impedance connecting the two pi-members together is favorably designed as a line section of the inner conductor.
  • the two Pi elements are identical in terms of their electrical and / or mechanical properties, because this can reduce the manufacturing and assembly costs of the high-pass filter.
  • a capacitor is connected in series between at least one inductance and the outer conductor.
  • the inductance forms a series resonant circuit in combination with the series connected capacitance. This makes it possible to attenuate signals in the range of the resonant frequency of the resonant circuit very strong.
  • a capacitor is connected in series between each inductance and the outer conductor. This allows a galvanic connection between the inductors and the outer conductor are avoided. This in turn results in a simplification of the mechanical construction of the high-pass filter.
  • the avoidance of a galvanic connection between the inductors and the outer conductor has the additional advantage that between at least one inductor and the capacitor connected in series with this a connection for feeding and / or tapping a supply or control voltage can be provided.
  • a high-frequency information signal in particular a communication or data signal
  • a supply voltage in particular a DC voltage or else a control voltage can be fed or tapped.
  • a signal for the digital remote control of an antenna can be used as the control voltage.
  • Such a signal may be fed and / or tapped at a node between an inductor and the capacitor connected in series with it.
  • the capacitance connected in series with the inductance in such a way that it represents a high resistance between the inductance and the outer conductor with regard to the supply and / or control voltage which is low compared to the information signals.
  • the high-pass filter for example by means of connectors or by means of cable connections or a combination of both, be inserted into a coaxial transmission line.
  • the high-pass filter according to the invention preferably has a rigid housing part, which is formed by the outer conductor.
  • the housing part is made of metal.
  • the insulation layer arranged between the inner conductor and the outer conductor in a preferred embodiment, the housing part on the inside at least partially lined.
  • the insulation layer can be made, for example, from a PTFE material (polytetrafluoroethylene material).
  • the insulating layer forms a dielectric of at least one capacitance, which is connected in series with an inductance.
  • At least one inductance of the high-pass filter forms a spacer between the inner conductor and the outer conductor.
  • the high-pass filter according to the invention is preferably used for the transmission of mobile radio signals. It can be provided that by means of the high-pass filter signals in the range of 800 MHz to about 960 MHz are subject to an attenuation of more than 30 dB, in particular an attenuation of at least 40 dB, whereas mobile radio signals in the range of 1700 MHz and 2700 MHz are practically not attenuated ,
  • FIG. 1 schematically shows a longitudinal section of a total occupied by the reference numeral 10 high-pass filter having a central filter part 12 and an input-side connector 14 and an output-side connector 16.
  • the input-side connector 14 is connected to the in FIG. 3 shown signal input 18 of the filter part 12 is connected, and the output-side connector 16 is connected to the in FIG. 3 shown signal output 20 of the filter part 12 connected.
  • the two connectors 14 and 16 have a central contact socket 22 and 24, which is surrounded by a contact sleeve 26 and 28, respectively.
  • the filter part 12 can be connected to a known per se and therefore not shown in the drawing input line, for example, can connect between a mobile phone antenna and the filter part 12. With the help of the filter part 12, the received signal filtered and then fed via the output-side connector 16 and a connectable to this in the usual way output line, for example, a signal receiver.
  • the filter part 12 has a sleeve-shaped housing 30, which is screwed on the one hand to the input-side contact sleeve 26 and on the other hand to the output-side contact sleeve 28.
  • a sleeve-shaped housing 30 which is screwed on the one hand to the input-side contact sleeve 26 and on the other hand to the output-side contact sleeve 28.
  • the high-pass filter 10 is designed in a coaxial design, wherein the input and output side contact sleeves 26 and 28 in conjunction with the housing 30 form an outer conductor, which can be grounded, for example, and represents a ground line.
  • the input and output side contact sleeves 26, 28 and the housing 30 receive a central inner conductor 32, which connects the input-side contact socket 22 with the output-side contact socket 24 and is electrically isolated from the contact sleeves 26, 28 and the housing 30.
  • the inner conductor 32 in the adjoining the contact sockets 22 and 24 areas each by means of a support sleeve 34 and 36, which is made of an electrically insulating material, kept at a distance from the input-side contact sleeve 26 and the housing 30.
  • a support sleeve 34 and 36 which is made of an electrically insulating material, kept at a distance from the input-side contact sleeve 26 and the housing 30.
  • additional spacers in the form of spiral coils 38, 39, 40, 41 are used, which will be described in more detail below.
  • FIG. 3 an electrical circuit diagram of the filter part 12 is shown. It can be seen that the inner conductor 32 connects the signal input 18 to the signal output 20, wherein in the inner conductor 32, a first and a second capacitance 43 and 44 and a third and a fourth capacitance 45 and 46 are connected in series and between the first capacitor 43 and the second capacitor 44, a first impedance 48, between the second capacitor 44 and the third capacitor 45, a second impedance 49 and between the third capacitor 45 and the fourth capacitor 46, a third impedance 50 is connected.
  • a second inductor 56 branches off in the region between the second capacitor 44 and the second impedance 49 from the inner conductor 32 and is connected via a sixth capacitor 57 to the outer conductor acting as a housing 30 in electrical connection.
  • a fourth inductor 62 branches off in the region between the fourth capacitor 46 and the signal output 20 from the inner conductor 32 and is connected via an eighth capacitor 63 to the grounded housing 30 in electrical connection.
  • the filter part 12 thus forms a first pi-member 65 and a second pi-member 66, which are connected to each other via the second impedance 49.
  • the first pi-member 65 is controlled by the first and second inductors 52, 56 and the in Row to these switched fifth and sixth capacitances 54, 57 and from the first and second capacitances 43, 44 and the first impedance 48 connected between them.
  • the second pi-gate 66 is constituted by the third and fourth inductors 59, 62 and the seventh and eighth capacitors 60, 63 connected in series therewith, and the third and fourth capacitors 45, 46 connected in series and the third connected between them Impedance 50 is formed.
  • the first to fourth capacitances 43, 44, 45, 46 are configured identically in electrical terms and also in mechanical terms - which will be discussed in greater detail below. They each have a value of a few pF. Also, the first to fourth inductors 52, 56, 59 and 62 are identical in both electrical and mechanical respects. They each have a value of a few nH.
  • a high-frequency signal is applied to the signal input 18, it experiences a different attenuation as a function of its frequency.
  • FIG. 4 schematically illustrating the transmission loss between the signal input 18 and the signal output 20 in dependence on the frequency of the signal. It is clear that signals with a frequency of more than 1.4 GHz experience virtually no attenuation, whereas signals with a frequency of less than 1.4 GHz are subject to very high attenuation. Thus, for example, signals with frequencies in the range of 0.8 to 1.0 GHz can be practically masked out, whereas signals with frequencies in the range of 1.7 to 2.7 GHz, the high-pass filter 10 can pass unhindered.
  • the inductors 52, 56, 59 and 62 are formed by the spiral coils 38, 39, 40 and 41 already mentioned above with respect to their distance-maintaining function. These are designed identically and each form discrete electrical components, which are arranged at a distance to each other in order to avoid mutual electrical interference.
  • the structure of the coils 38 to 41 is particularly made FIG. 2 clear. Starting from an inner sleeve 68 surrounding the inner conductor 32 in the circumferential direction, they extend spirally up to an outer sleeve 69, wherein they extend in a plane oriented perpendicular to the inner conductor 32.
  • the outer sleeve 69 not only forms the outer contact of the spiral coils 38, 39, 40 and 41, but also simultaneously provides a first contact electrode of the capacitors 54, 57, 60 connected in series with the respective coils 38, 39, 40 and 41, respectively
  • These capacitors are in each case configured as tube capacitors 71, 72, 73 and 74, the inner contact electrode of the tube capacitors 71, 72, 73, 74 being formed by the outer sleeve 69 and the outer contact electrode being formed by the housing 30.
  • a housing 30 lining the insulating layer 76, which thus represents the dielectric of the tube capacitors 71 to 74.
  • the inner sleeve 68 of the first coil 38 is penetrated by a rear end piece 78 of an input section 79 of the inner conductor 32 which faces away from the input-side contact socket 22 and electrically connects the input-side contact socket 22 to the inner sleeve 68 of the first coil 38.
  • a first intermediate portion 81 of the inner conductor 32 connects with the interposition of a tube capacitor 83, which forms the first capacitor 43 and its structure explained in more detail below becomes.
  • a further tube capacitor 84 which forms the second capacitor 44 and is configured identically to the tube capacitor 83, connects to the first intermediate portion 81, a connecting portion 86 of the inner conductor 32, and the connecting portion 86 is connected via a tube capacitor 87, which is the third Capacitance 45 is formed and identical as the tube capacitors 83 and 84 is formed, with a second intermediate portion 89 of the inner conductor 32 in electrical connection.
  • the second intermediate section 89 is adjoined by an additional tubular capacitor 90, which forms the fourth capacitor 46 and has the same design as the tubular capacitors 83, 84 and 87, an output section 92 of the inner conductor 32.
  • the output-side contact socket 24 is connected.
  • the first intermediate portion 81 of the inner conductor 32 forms the first impedance 48 and is integrally connected to a front contact sleeve 94 and a rear contact sleeve 95 which receive a front insulating sleeve 97 and a rear insulating sleeve 98.
  • the front insulating sleeve 97 the rear end portion 78 of the input portion 79 dives, and in the rear insulating sleeve 98 dives a front end portion 100 of the connecting portion 86 a.
  • the rear end portion 78 of the input portion 79 in combination with the front insulating sleeve 97 and the front contact sleeve 94, forms the tube capacitor 83, which constitutes the first capacitor 43.
  • the connecting portion 86 has a front end piece 100 facing the first intermediate portion 81 and a rear end piece 101 facing the second intermediate portion 89.
  • the front end 100 dips into the rear insulating sleeve 98, which is surrounded by the rear contact sleeve 95 is.
  • the front end 100 thus forms, in combination with the rear insulating sleeve 98 and the rear contact sleeve 95, the tube capacitor 84, which constitutes the second capacitor 44.
  • the second intermediate portion 89 is configured identically as the first intermediate portion 81 of the inner conductor 32. Also, the second intermediate portion 89 is integrally connected to a front contact sleeve 102 and a rear contact sleeve 103 which receive a front insulating sleeve 105 and a rear insulating sleeve 106. In the front insulating sleeve 105 dives the rear end portion 101 of the connecting portion 86, which thus forms in combination with the front insulating sleeve 105 and the front contact sleeve 102, the tube capacitor 87, which is the third capacitor 45.
  • a front end portion 108 of the output portion 92 Inserted into the rear insulating sleeve 106 is a front end portion 108 of the output portion 92 which, in combination with the rear insulating sleeve 106 and the rear contact sleeve 103, forms the tube capacitor 90, which constitutes the fourth capacitor 46.
  • the first intermediate portion 81 forms the first impedance 48
  • the connecting portion 86 forms the second impedance 49
  • the second intermediate portion 89 forms the third impedance 50.
  • the high-pass filter 10 can thus be manufactured and assembled in a structurally simple manner, it being ensured that the inductors 52, 56, 59 and 62 in the form of spiral coils 38, 39, 40 and 41, which are formed as discrete electrical components, are spaced apart from one another between the coils 38, 39, 40, 41 in each case one of a line section of the inner conductor 32 formed impedance 48, 49 and 50 is arranged.
  • the high-pass filter 10 can be formed in this way in a coaxial design, wherein signals be passed with a frequency greater than 1.4 GHz practically unattenuated from the signal input 18 to the signal output 20, whereas signals with a frequency less than 1.4 GHz are subject to a strong attenuation.
  • dash-dot is still a supplement of the circuit diagram shown according to a further advantageous embodiment of the high-pass filter by a node 110 is provided between the first inductor 52 and connected in series with this fifth capacitor 54, to which a terminal 111 can be connected to feed and / or picking up a supply or control voltage.
  • a node 113 is provided between the fourth inductor 62 and the eighth capacitor 63 connected in series with it, to which a terminal 114 can be connected, via which a supply or control voltage can also be fed or tapped.
  • a supply voltage can be connected or tapped at the terminals 111 and / or 114, which is supplied to an amplifier.
  • control signals in particular signals for controlling an antenna, can be fed or tapped by means of the terminals 111 and 114. This is possible because it is ensured by means of each connected in series with an inductor 52, 56, 59, 62 capacitance 54, 57, 60 and 63 that no galvanic connection between the inner conductor 32 and the grounded housing 30, the Function of an external conductor takes over.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Filters And Equalizers (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)
EP08017065A 2007-12-11 2008-09-27 Filtre passe-haut Withdrawn EP2071660A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102007061413A DE102007061413A1 (de) 2007-12-11 2007-12-11 Hochpassfilter

Publications (1)

Publication Number Publication Date
EP2071660A1 true EP2071660A1 (fr) 2009-06-17

Family

ID=40351555

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08017065A Withdrawn EP2071660A1 (fr) 2007-12-11 2008-09-27 Filtre passe-haut

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US (1) US7952451B2 (fr)
EP (1) EP2071660A1 (fr)
DE (1) DE102007061413A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011056710A1 (de) 2011-12-20 2013-06-20 Telegärtner Karl Gärtner GmbH Koaxiales elektrisches Übertragungselement

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009031373A1 (de) * 2009-07-01 2011-01-05 Kathrein-Werke Kg Hochfrequenzfilter
US8487717B2 (en) 2010-02-01 2013-07-16 Ppc Broadband, Inc. Multipath mitigation circuit for home network
US8742871B2 (en) * 2011-03-10 2014-06-03 Taiwan Semiconductor Manufacturing Co., Ltd. Devices and bandpass filters therein having at least three transmission zeroes
US8830011B2 (en) * 2011-10-27 2014-09-09 Taiwan Semiconductor Manufacturing Co., Ltd. Band-pass filter using LC resonators
EP3123556A4 (fr) * 2014-03-24 2017-11-22 Telefonaktiebolaget LM Ericsson (publ) Filtre coaxial et procédé de fabrication de ce dernier

Citations (8)

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Publication number Priority date Publication date Assignee Title
FR888760A (fr) 1941-12-13 1943-12-22 Telefunken Gmbh Perfectionnements aux filtres pour ondes décimétriques
FR53848E (fr) 1944-10-25 1946-09-09 Telefunken Gmbh Perfectionnements aux filtres pour ondes décimétriques
US3167729A (en) * 1962-10-29 1965-01-26 Sylvania Electric Prod Microwave filter insertable within outer wall of coaxial line
US3238469A (en) 1962-04-05 1966-03-01 Microdot Inc Electronic assembly
US3602848A (en) * 1969-08-13 1971-08-31 Varian Associates High frequency coaxial filter
DE3207422A1 (de) 1982-03-02 1983-09-08 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Koaxiales tiefpassfilter oder kontaktloser kurzschlussschieber
EP0521739A1 (fr) * 1991-07-05 1993-01-07 Nec Corporation Circuit de polarisation à micro-ondes
WO1994028592A1 (fr) 1993-05-27 1994-12-08 E.I. Du Pont De Nemours And Company Circuits hyperfrequence accordables supraconducteurs/ferroelectriques a coefficient de temperature eleve

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US3506936A (en) * 1967-04-03 1970-04-14 Motorola Inc Parallel plate feed-through capacitor
JP3739858B2 (ja) 1996-06-14 2006-01-25 松下電器産業株式会社 高周波フィルタ
FI115331B (fi) * 2000-09-22 2005-04-15 Filtronic Comtek Oy Ylipäästösuodatin
DE102004010683B3 (de) 2004-03-04 2005-09-08 Kathrein-Werke Kg Hochfrequenzfilter

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR888760A (fr) 1941-12-13 1943-12-22 Telefunken Gmbh Perfectionnements aux filtres pour ondes décimétriques
FR53848E (fr) 1944-10-25 1946-09-09 Telefunken Gmbh Perfectionnements aux filtres pour ondes décimétriques
US3238469A (en) 1962-04-05 1966-03-01 Microdot Inc Electronic assembly
US3167729A (en) * 1962-10-29 1965-01-26 Sylvania Electric Prod Microwave filter insertable within outer wall of coaxial line
US3602848A (en) * 1969-08-13 1971-08-31 Varian Associates High frequency coaxial filter
DE3207422A1 (de) 1982-03-02 1983-09-08 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Koaxiales tiefpassfilter oder kontaktloser kurzschlussschieber
EP0521739A1 (fr) * 1991-07-05 1993-01-07 Nec Corporation Circuit de polarisation à micro-ondes
WO1994028592A1 (fr) 1993-05-27 1994-12-08 E.I. Du Pont De Nemours And Company Circuits hyperfrequence accordables supraconducteurs/ferroelectriques a coefficient de temperature eleve

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
"International Journal of Infrared and Millimeter Waves", 11 November 1992, SPRINGER, article "Low-pass and high-pass filters using coaxial-type dielectric resonators"
SACHIHIRO TOYODA: "LOW-PASS AND HIGH-PASS FILTERS USING COAXIAL-TYPE DIELECTRIC RESONATORS", INTERNATIONAL JOURNAL OF INFRARED AND MILLIMETER WAVES, SPRINGER, DORDRECHT, NL, vol. 13, no. 11, 1 November 1992 (1992-11-01), pages 1745 - 1755, XP000307007, ISSN: 0195-9271 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011056710A1 (de) 2011-12-20 2013-06-20 Telegärtner Karl Gärtner GmbH Koaxiales elektrisches Übertragungselement
EP2608312A1 (fr) 2011-12-20 2013-06-26 Telegärtner Karl Gärtner Gmbh Élément de transmission électrique coaxial

Also Published As

Publication number Publication date
US20090153270A1 (en) 2009-06-18
US7952451B2 (en) 2011-05-31
DE102007061413A1 (de) 2009-06-25

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