EP2009732A1 - Composant de filtre quart d'onde réglable - Google Patents
Composant de filtre quart d'onde réglable Download PDFInfo
- Publication number
- EP2009732A1 EP2009732A1 EP08010853A EP08010853A EP2009732A1 EP 2009732 A1 EP2009732 A1 EP 2009732A1 EP 08010853 A EP08010853 A EP 08010853A EP 08010853 A EP08010853 A EP 08010853A EP 2009732 A1 EP2009732 A1 EP 2009732A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- contact
- short
- filter assembly
- conductor
- tunable
- 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.)
- Granted
Links
Images
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
- H01P1/24—Terminating devices
- H01P1/28—Short-circuiting plungers
Definitions
- the invention relates to a tunable ⁇ / 4 filter assembly having a signal-carrying electrical conductor and a lying on a reference potential electrically conductive element, which may be in particular a lying on ground housing.
- ⁇ / 4 filters are used as bandpass filters in high-frequency technology, for example.
- such filters have a short-circuit line of fixed length between a signal-carrying conductor and a ground.
- the bandpass character of such a filter results from the particular wave characteristic at high frequencies, since at high frequencies the short circuit at the center frequency f 0 is hidden, so that signals with frequencies distributed within a certain bandwidth around the center frequency, the conductor can happen.
- Such filters are also used as overvoltage protection, for example in mobile communications.
- an overvoltage protection connector for a coaxial cable having an inner and an outer conductor, wherein a spiral short-circuiting Blind tail of fixed length shorts the inner conductor to the outer conductor.
- an overvoltage protection device in which an inner conductor is arranged in a housing which together form a coaxial line.
- a fixed length helical conductor serves as a shorting element to transfer energy to a ground connection during an overvoltage event.
- a disadvantage of the known filter is the fact that, as a result of the fixed short-circuit length, the center frequency is fixed. Consequently, a separate filter must be used for each different frequency response.
- the present invention is therefore an object of the invention to provide a ⁇ / 4 filter assembly, which is universal and can be used for a variable frequency range.
- a key idea of the invention is to provide a tunable ⁇ / 4 filter whose frequency response is variable by the length of a short-circuiting device is adjustable.
- a tunable ⁇ / 4 filter assembly comprising a signal carrying electrical conductor and an electrically conductive element located at a reference potential.
- at least one short-circuit device is provided, which electrically contacts the electrical conductor.
- an electrical coupling device is provided which the Short-circuit device coupled to the electrically conductive element at an adjustable contact point, wherein the electrical coupling device and the short-circuiting device are movable relative to each other, so as to be able to adjust the length of the short-circuiting device.
- the length of the short-circuit device is preferably continuously adjustable within a predeterminable length range, whereby the center frequency of the tunable ⁇ / 4 filter assembly is also continuously adjustable. In this way, a ⁇ / 4 filter with variable bandpass performance is achieved.
- the short-circuit device expediently has a first contact section, which is connected to the electrical conductor, and a second contact section adjoining the first contact section, to which the electrical coupling device electrically engages.
- a compact design with a large adjustment range results when the second contact portion of the short-circuiting means forms a substantially circular conductor element, which is arranged concentrically and substantially at a distance r around the electrical conductor, the circumference of which is smaller than 2 ⁇ r.
- the electrical element is preferably an electrically conductive housing which at least partially surrounds the conductor and the at least one short-circuiting device.
- the housing is preferably cylindrical.
- the coupling device has a first rotatable, electrically conductive actuating element with a contact element.
- the contact element acts on an adjustable contact point on the short-circuit device.
- a slot having a predetermined length is provided in the housing, which allows a displacement of the contact element by means of the adjusting element along the short-circuiting device.
- the actuator is applied to the housing and thus, on the housing potential.
- At least one further short-circuit device is provided, which is arranged offset axially relative to the first short-circuit device with respect to the longitudinal axis of the electrical conductor. It has a first contact section, which is connected to the electrical conductor, and a second adjoining the first contact section contact section, to which the coupling device electrically engages.
- the ⁇ / 4 filter assembly has two center frequencies that increase its bandwidth.
- the second contact section of the further short-circuit device also forms a circular conductor element, which is arranged substantially concentrically and essentially at a distance r around the electrical conductor, the circumference of which is again smaller than 2 ⁇ r.
- the electrical element is in turn formed as a conductive housing, which at least partially surrounds the conductor and the short-circuiting devices.
- the coupling device has a second rotatable electrically conductive rotatable actuating element with a contact element.
- the contact element acts on an adjustable contact point on the further short-circuit device, wherein in the housing a slot for displacing the contact element is provided.
- the actuating element in turn rests on the housing, so that the actuating element and the housing are at the same potential.
- the adjusting elements are annular.
- the two adjusting elements can be connected to one another. However, in order to be able to set the length of the two short-circuit devices individually, the two adjusting elements can be moved independently of one another.
- a further short-circuit device which lies in the same plane as the first short-circuit device.
- the further short-circuit device has a first contact section, which is connected to the electrical conductor, and a second contact section adjoining the first contact section, which electrically engages the electrical coupling device.
- the second contact portions of the two short-circuit devices each form a circular segment-shaped conductor element, which is arranged in each case substantially at a distance r around the electrical conductor, wherein the two second contact portions are arranged substantially diametrically opposite one another.
- each second contact section is smaller than ⁇ r.
- the electrical element may again be a conductive housing that at least partially surrounds the conductor and the shorting device.
- the coupling device can have a rotatable, electrically conductive actuating element with two contact elements, wherein the one contact element acts on an adjustable contact point on the second contact section of the first short-circuit device and the other contact element acts on an adjustable contact point on the second contact section of the other short-circuit device.
- a slot for displacing the contact elements by means of the adjusting element is provided in the housing, wherein the actuating element is in electrical contact with the housing and thus lies on the housing potential.
- a more flexible and efficient coupling device has a first and a second rotatable electrically conductive actuating element, each with a contact element, wherein the actuating elements are movable independently of each other.
- the contact element of the first control element engages an adjustable contact point on the second contact section of the first short-circuit device, while the contact element of the second control element acts on an adjustable contact point on the second contact section of the other short-circuit device.
- at least one slot for moving the contact elements by means of the adjusting elements may be provided in the housing, wherein the adjusting elements to abut the housing, so that the control elements and the housing are at the same potential.
- the contact elements are designed as sliding contacts.
- the coupling device instead of carrying out the coupling device movably and firmly connecting the short-circuiting device to the conductor, it is conceivable to form the coupling device statically and to mount the at least one short-circuiting device movably.
- the short-circuit devices can be freely movably connected to the electrical conductor, wherein an electrical connection must be ensured.
- the short-circuiting device could be connected to a dielectric adjusting element, which rests movably on the housing.
- the coupling device could be designed so that it is axially movable to the conductor, in which case the at least one short-circuiting device at least partially parallel to the conductor and the coupling device electrically engages the short-circuiting device.
- Fig. 1 shows an exemplary ⁇ / 4 filter assembly 10, the center frequency and thus the bandwidth of which is adjustable by means of two short-circuit devices 40 and 50 of variable length.
- the ⁇ / 4 filter assembly 10 shown schematically in longitudinal section has an inner signal-carrying conductor 20 having terminals 25 at its two ends.
- the electrical conductor 20 is preferably held centrally in an electrically conductive housing 30.
- the housing 30 has a circular cross-section, wherein the diameter in the vicinity of the two line ends is smaller than in the middle region of the electrical conductor 20.
- the two short-circuit devices 40 and 50 are soldered, the design of which Fig. 2 is shown in more detail.
- a coupling device 70 which has two electrically conductive rings 73 and 75 as adjusting elements.
- the electrical housing may include two parallel grooves in which the rings are rotatably guided.
- a sliding contact 72 is formed, which electrically contacts the short-circuiting device 40, while on the ring 75, a sliding contact 77 is integrally formed, which contacts the short-circuiting device 50 electrically.
- slots are provided so that the sliding contacts along the respective short-circuiting device can be moved by means of the rings.
- Fig. 2 shows in cross section the filter assembly 10 and in particular the electrically conductive housing 30, which at least partially surrounds the electrical conductor 20 and the two short-circuiting devices 40 and 50.
- the short-circuiting device 40 has a first conductor-shaped contact portion 40a, one end of which is electrically connected to the electrical conductor 20 at a predetermined location.
- the ladder-shaped contact portion 40a extends perpendicularly away from the electrical conductor 20 and has a length r.
- a circular segment-shaped contact portion 40b is formed at the outer end of the contact portion 40a.
- the electrical conductor 20 forms the center of the circular segment-shaped contact section 40b, wherein the radius of curvature of the contact section 40b substantially corresponds to the length r.
- the sliding contact 72 of the annular adjusting element 73 engages at a contact point 80 on the circular segment-shaped contact portion 40b.
- the sliding contact 72 moves along the circular segment-shaped contact portion 40b, whereby the contact point 80 and thus the length of the short-circuiting device 40 can be changed continuously.
- the short-circuit connection extends from the conductor 20, via the Konatktabroughe 40 a and 40 b, the contact point 80, the sliding contact 72, the actuator 73 to the electrically conductive housing 30th
- the in the Fig. 2 illustrated second short-circuit device 50 is similar to the short-circuit device 40 constructed.
- a ladder-shaped contact portion 50a is electrically connected to the electrical conductor 20 at one location, so that both short-circuiting devices 40, and 50 are in the same plane.
- the ladder-shaped contact portion 50a again extends perpendicularly away from the electrical conductor 20.
- At its outer end a circular segment-shaped contact portion 50b is formed.
- the ladder-shaped contact portion 50a may, but need not, have the same length r as the ladder-shaped contact portion 40a.
- both of the circular-segment-shaped contact portions 40b and 50b have a circumference smaller than ⁇ r. In this way results in a setting angle for the adjusting elements 73 and 75, which is smaller than 180 °.
- the setting angle can be, for example, 150 °.
- the sliding contact 77 of the actuating element 75 engages a variable contact point 85 on the circular segment-shaped contact portion 50b, whereby the length of the short-circuiting device 50 is adjustable.
- the in Fig. 2 illustrated circular segment-shaped contact portions 40b and 50b may be formed as a linear contact portions, which are arranged parallel to the conductor 20.
- the adjusting elements 73 and 75 are not formed as rotatable rings, but as adjusting elements, the can be moved along the electrical conductor, in which case the sliding contacts 72 and 75 at the elongated contact portions which extend parallel to the electrical conductor, attack.
- Fig. 3 shows a plan view of in Fig. 1 shown filter assembly 10 with the two annular control elements 73 and 75, wherein the housing 30 marks or detent points may be present in order to set predefined bandwidths for the ⁇ / 4 filter assembly 10 can.
- Fig. 4 shows an alternative ⁇ / 4 filter assembly 100, in which two short-circuiting devices 140 and 150 with respect to an electrical conductor 120 are axially displaced from each other and thus form a parallel circuit.
- An electrical housing 130 is disposed at least partially around the electrical conductor 120 and the short-circuiting devices 140 and 150 and has a similar shape as the electrical housing 30 according to FIG Fig. 1 on.
- a coupling device 170 is provided which, with respect to the conductor 120, comprises two axially displaced annular adjusting elements 173 and 125.
- the annular control element 173 has a sliding contact 172, which acts to change the length of the short-circuiting device 140 thereto, while a sliding contact 177 of the annular control element 175 acts on the short-circuiting device 150.
- FIG. 5 is schematically the cross section of in Fig. 4 shown filter assembly 100 shown.
- the circular electrical enclosure 130 surrounds the electrical conductor 130 and the shorting devices 140 and 150 electrically connected to the conductor 130.
- the short-circuit device 140 is shaped similar to the short-circuit device 140 and is concealed by it in the illustration shown.
- the short-circuiting device 140 has a ladder-shaped contact section 140a, which is soldered to a contact point of the electrical conductor 120, for example.
- the ladder-shaped contact portion 140a extends perpendicularly away from the electrical conductor 120.
- the length of the contact portion 140a is r.
- At the outer end of the ladder-shaped contact portion 140a is followed by a circular contact portion 140b which extends substantially at a distance r concentrically around the electrical conductor 120.
- the circumference of the circular contact portion 140b is smaller than 2 ⁇ r, so that there is a setting angle for the actuator 173, which is smaller than 360 ° but larger than the setting angle of in Fig. 1 and 2 shown adjusting elements.
- the sliding contact 172 of the adjusting element 173 engages a contact point 180 on the circular contact section 140b, thereby forming an electrical connection between the electrical conductor 120 and the housing 130, via the contact section 140a, the circular contact section 140b, the loop contact 172 the electrically conductive actuator 173 and the housing 130 is formed.
- the actuator 175 and the short-circuiting device 150 At an axial distance to the actuator 175 and the short-circuiting device 150 is arranged.
- Control element 173 and control element 175 can be moved independently of each other, so that the bandwidth of the ⁇ / 4 filter assembly 100 is variably adjustable.
- Fig. 6 are the waveforms of the VSWR versus frequency for a single short-circuit ⁇ / 4 filter and for the in Fig. 4 shown ⁇ / 4 filter assembly shown with a parallel connection of two short-circuiting devices. It can clearly be seen that the bandwidth of a ⁇ / 4 filter assembly as shown in FIG Fig. 4 shown has a greater bandwidth than a ⁇ / 4 filter assembly, which uses only a single short-circuit device. This is because the two shorting devices 140 and 150 each specify a center frequency for the ⁇ / 4 filter, as shown in FIG Fig. 6 can be seen at the marked with 1 and 2 places.
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Filters And Equalizers (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
- Oscillators With Electromechanical Resonators (AREA)
- Networks Using Active Elements (AREA)
- Semiconductor Lasers (AREA)
- Coupling Device And Connection With Printed Circuit (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102007030157A DE102007030157A1 (de) | 2007-06-27 | 2007-06-27 | Abstimmbare λ/4 Filterbaugruppe |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2009732A1 true EP2009732A1 (fr) | 2008-12-31 |
EP2009732B1 EP2009732B1 (fr) | 2011-03-23 |
Family
ID=39765233
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08010853A Not-in-force EP2009732B1 (fr) | 2007-06-27 | 2008-06-14 | Assemblage de filtre quart-lambda réglable |
Country Status (4)
Country | Link |
---|---|
US (1) | US7826194B2 (fr) |
EP (1) | EP2009732B1 (fr) |
AT (1) | ATE503286T1 (fr) |
DE (2) | DE102007030157A1 (fr) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8456789B2 (en) * | 2010-12-15 | 2013-06-04 | Andrew Llc | Tunable coaxial surge arrestor |
CN109643834B (zh) * | 2016-07-18 | 2020-10-30 | 康普公司意大利有限责任公司 | 适于蜂窝应用的管状直列式滤波器及相关方法 |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2438912A (en) | 1942-06-29 | 1948-04-06 | Sperry Corp | Impedance transformer |
US3264584A (en) | 1961-11-15 | 1966-08-02 | Bell Telephone Labor Inc | Adjustable impedance matching transformers |
DE1541960A1 (de) | 1967-02-01 | 1970-11-26 | Philips Patentverwaltung | Schmalbandige Filteranordnung |
US4544984A (en) * | 1982-06-23 | 1985-10-01 | Hirose Electric Co., Ltd. | Coaxial lightning arresting structure |
DE19520974A1 (de) | 1995-06-08 | 1996-12-12 | Spinner Gmbh Elektrotech | Überspannungsschutz für HF-Leitungen |
DE9422171U1 (de) * | 1993-10-07 | 1998-09-17 | Andrew AG, Bachenbulach, Zürich | Überspannungsschutz-Steckverbindung |
US6061223A (en) | 1997-10-14 | 2000-05-09 | Polyphaser Corporation | Surge suppressor device |
WO2004004064A1 (fr) | 2002-06-26 | 2004-01-08 | Huber & Suhner Ag | Dispositif parafoudre et filtre antiparasite |
EP1772931A2 (fr) | 2005-10-07 | 2007-04-11 | Andrew Corporation | Suppresseur de surtension coaxial à inductivité plane multiple |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE87341C (fr) | ||||
EP0840404B1 (fr) * | 1993-10-07 | 2000-12-27 | Andrew A.G. | Protecteur de surtension |
DE19936869C1 (de) | 1999-08-05 | 2001-03-08 | Spinner Gmbh Elektrotech | Koaxialer Überspannungsableiter |
WO2002103875A1 (fr) * | 2001-06-15 | 2002-12-27 | Kauffman George M | Dispositif de protection |
-
2007
- 2007-06-27 DE DE102007030157A patent/DE102007030157A1/de not_active Withdrawn
-
2008
- 2008-06-14 AT AT08010853T patent/ATE503286T1/de active
- 2008-06-14 DE DE502008002925T patent/DE502008002925D1/de active Active
- 2008-06-14 EP EP08010853A patent/EP2009732B1/fr not_active Not-in-force
- 2008-06-25 US US12/146,028 patent/US7826194B2/en not_active Expired - Fee Related
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2438912A (en) | 1942-06-29 | 1948-04-06 | Sperry Corp | Impedance transformer |
US3264584A (en) | 1961-11-15 | 1966-08-02 | Bell Telephone Labor Inc | Adjustable impedance matching transformers |
DE1541960A1 (de) | 1967-02-01 | 1970-11-26 | Philips Patentverwaltung | Schmalbandige Filteranordnung |
US4544984A (en) * | 1982-06-23 | 1985-10-01 | Hirose Electric Co., Ltd. | Coaxial lightning arresting structure |
DE9422171U1 (de) * | 1993-10-07 | 1998-09-17 | Andrew AG, Bachenbulach, Zürich | Überspannungsschutz-Steckverbindung |
DE19520974A1 (de) | 1995-06-08 | 1996-12-12 | Spinner Gmbh Elektrotech | Überspannungsschutz für HF-Leitungen |
US6061223A (en) | 1997-10-14 | 2000-05-09 | Polyphaser Corporation | Surge suppressor device |
WO2004004064A1 (fr) | 2002-06-26 | 2004-01-08 | Huber & Suhner Ag | Dispositif parafoudre et filtre antiparasite |
EP1772931A2 (fr) | 2005-10-07 | 2007-04-11 | Andrew Corporation | Suppresseur de surtension coaxial à inductivité plane multiple |
Also Published As
Publication number | Publication date |
---|---|
US7826194B2 (en) | 2010-11-02 |
DE502008002925D1 (de) | 2011-05-05 |
EP2009732B1 (fr) | 2011-03-23 |
ATE503286T1 (de) | 2011-04-15 |
US20090002103A1 (en) | 2009-01-01 |
DE102007030157A1 (de) | 2009-01-08 |
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