EP1169747A1 - Hochfrequenzfilter - Google Patents
HochfrequenzfilterInfo
- Publication number
- EP1169747A1 EP1169747A1 EP00925207A EP00925207A EP1169747A1 EP 1169747 A1 EP1169747 A1 EP 1169747A1 EP 00925207 A EP00925207 A EP 00925207A EP 00925207 A EP00925207 A EP 00925207A EP 1169747 A1 EP1169747 A1 EP 1169747A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- frequency filter
- immersion
- tuning element
- filter according
- dielectric
- 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
- 239000004020 conductor Substances 0.000 claims abstract description 50
- 239000003989 dielectric material Substances 0.000 claims abstract description 8
- 238000007654 immersion Methods 0.000 claims description 12
- 239000000919 ceramic Substances 0.000 claims description 2
- 229910010293 ceramic material Inorganic materials 0.000 claims 1
- 229910052751 metal Inorganic materials 0.000 claims 1
- 239000002184 metal Substances 0.000 claims 1
- 229910052574 oxide ceramic Inorganic materials 0.000 claims 1
- 239000011224 oxide ceramic Substances 0.000 claims 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims 1
- 230000008859 change Effects 0.000 description 7
- 239000000463 material Substances 0.000 description 3
- 230000004323 axial length Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 238000004873 anchoring Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
-
- 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 filter in a coaxial design according to the preamble of claim 1.
- a generic high-frequency filter can consist of one or more individual resonators in coaxial technology.
- Such coaxially constructed high-frequency filters are generally used in radio engineering systems, for example in the mobile radio field. You can e.g. are used in base stations for mobile radio, specifically for the selection of defined transmission and reception bands.
- a known coaxial resonator be ⁇ which comprises a cylindrical sealed housing with a bottom and an inner conductor tube, which is seated coaxially to the outer conductor.
- the cylindrically shaped inner conductor tube takes a cylindrical inner conductor section that slides in the inner conductor tube. By displacing the end section of this inner conductor section relative to the inner conductor tube, resonance tuning is carried out with respect to the respective frequency.
- the inner conductor is designed in the form of a sleeve which is closed at the end and which is held and anchored at the upper open end of the outer conductor tube in the region of a cover to be attached.
- a further high-frequency filter which uses a screw element to tune the frequency band in question, which is arranged on the cover of the individual resonator with a cylindrical structure, and penetrates to different depths into the inner conductor of the coaxial individual resonator by screwing in and out .
- This also results in a change in capacitance of the resonator, as in DE 21 36 728, and a change in frequency as a result of the change in capacitance.
- a high-frequency resonator is also known in principle from EP 0 068 919 A1, which has a setting device which runs transversely to the longitudinal axis of the resonator and can be radially screwed in and out differently from the outside through the wall of the resonator.
- this adjusting device has a pin made of dielectric material running transversely to the axial direction of the resonator, so that by adjusting the adjusting device and radial displacement of the pin made of dielectric material, a capacitance and Frequency change is feasible.
- a disadvantage of the tuning configuration explained is that components for tuning the resonance frequency impair the homogeneity of the electrically conductive surface in the interior of the filter (for example sliding contacts, solder joints, transition areas of different materials, etc.) and that there is a disadvantageous change in the frequency response due to undefined contacts at the relevant contact points is (intermodulation).
- the tuning device requires a not insignificant space requirement.
- Another disadvantage is that a change in temperature affects the frequency response.
- the object of the present invention is to provide an improved high-frequency filter in a coaxial design.
- the present invention provides simple means a significant improvement over conventional high-frequency filters or coaxial filters.
- a problem-free frequency tuning can be carried out without indefinite contacts resulting in undesired passive intermodulation.
- the tuning element consisting of a dielectric material and immersed in the coaxial inner conductor is not anchored to the cover of the high-frequency filter device as in the prior art.
- the anchoring is preferably carried out in such a way that the resulting capacitance between the open end of the inner conductor and the housing cover decreases when the temperature rises and thus results in frequency-related temperature compensation of the filter.
- the electrical tuning elements in the inner conductor preferably in the region of the bottom of the coaxial filter element, are supported so as to be adjustable at different heights in order to enable the temperature compensation explained above.
- a dielectric material which has a thermal expansion coefficient that is as low as possible.
- FIG. 1 shows a schematic axial cross section through a high-frequency filter according to the invention in the form of a single resonator
- FIG. 2 a schematic horizontal cross section along the line II-III in FIG. 1.
- an individual resonator in coaxial technology is shown in axial longitudinal section or in cross section thereto, which is also referred to below as a coaxial resonator or coaxial filter.
- This consists of an outer conductor 1, an inner conductor 3 arranged concentrically or coaxially thereto in the exemplary embodiment shown, and a base 5, via which the electrically conductive outer conductor 1 and the electrically conductive inner conductor 3 are electrically connected to one another.
- an adjusting element 7 is provided, which in the embodiment shown consists of a threaded plate or pot 7 '.
- This thread The plate or threaded pot 7 'has an external thread 9 in its outer circumference, which is in engagement with a corresponding internal thread 11, which has at least a sufficient axial length on the inside of the inner conductor 3 and / or on the inside of one axially in the bottom 5 provided recess 13 is provided.
- the threaded plate or pot 7 ' has a twisting or driving attachment 15, in the exemplary embodiment shown in the form of a slot, for example in order to twist the adjusting element 7 and thus axially shift the same with respect to the inner conductor by means of a screwdriver.
- a pin-shaped immersion or tuning element 17 is fixedly arranged on this adjusting element 7, which is designed in the form of a pin or a cylinder in the exemplary embodiment shown.
- the length, the diameter, the dielectric constant and the attachment point of the dielectric tuning element or cylinder 17 are selected so that the desired resonance frequency can be set in the desired frequency range.
- the frequency is now set and tuned by rotating the setting element 7, as a result of which the setting element 7 with the dielectric tuning element 17 can be set in the interior of the inner conductor 3 at different axial heights relative to the inner conductor 3 in accordance with the double arrow position 21.
- the upper end of the inner conductor 3, based on the height of the outer conductor 1, comes to lie about 10 to 20% of the axial length of the outer conductor below the upper edge 23 of the outer conductor 1 and thus below the electrically conductive cover 25.
- the dielectric tuning element 17 projects, for example, slightly beyond the upper edge 27 of the inner conductor 3.
- the capacitance between the open end of the inner conductor and the housing cover and thus the resonance frequency can be changed and optimally adjusted and adjusted.
- the dielectric tuning element 17 does not touch the inner conductor 3 itself. If the tuning element is only attached via the adjusting element 7 via the thread engagement provided there, which in the exemplary embodiment shown takes place in the lower region of the inner conductor 3, preferably even only in the bottom region or in the region of the inner conductor 3 adjoining it, no capacities become undefined - And thus the frequency behavior adversely affecting undefined contacts created at the points of contact.
- the structure shown comprises yet another materiality ⁇ handy advantage since temperature compensation is possible.
- a dielectric tuning element is selected with an expansion temperature coefficient that is smaller than the temperature coefficient of the outer and / or inner conductor 1, 3 of the coaxial filter.
- the inner and outer conductors become longer, to a greater extent than the length of the dielectric tuning element changes.
- the resulting capacitance between the open end of the inner conductor on the housing cover decreases when the temperature rises, since the dielectric tuning element 17 does not expand to the same extent in terms of an increase in length as the inner and / or outer conductor that the frequency reduction resulting from the greater length increase of the inner and / or outer conductor can be compensated for by the simultaneous reduction in capacity.
- This behavior can be optimized by selecting a suitable dielectric material for the tuning element 17.
- Dielectric materials consisting of ceramic are particularly suitable for this. Materials that have a very low coefficient of thermal expansion and a low temperature coefficient of the relative dielectric constant are suitable.
Landscapes
- Control Of Motors That Do Not Use Commutators (AREA)
- Filters And Equalizers (AREA)
- Surgical Instruments (AREA)
- Superconductors And Manufacturing Methods Therefor (AREA)
- Non-Reversible Transmitting Devices (AREA)
Description
Claims
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19917087A DE19917087C2 (de) | 1999-04-15 | 1999-04-15 | Hochfrequenzfilter |
| DE19917087 | 1999-04-15 | ||
| PCT/EP2000/003302 WO2000064001A1 (de) | 1999-04-15 | 2000-04-13 | Hochfrequenzfilter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1169747A1 true EP1169747A1 (de) | 2002-01-09 |
| EP1169747B1 EP1169747B1 (de) | 2002-06-26 |
Family
ID=7904702
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP00925207A Expired - Lifetime EP1169747B1 (de) | 1999-04-15 | 2000-04-13 | Hochfrequenzfilter |
Country Status (12)
| Country | Link |
|---|---|
| EP (1) | EP1169747B1 (de) |
| JP (1) | JP2002542695A (de) |
| KR (1) | KR20010112362A (de) |
| CN (1) | CN1166027C (de) |
| AT (1) | ATE219862T1 (de) |
| AU (1) | AU769264B2 (de) |
| BR (1) | BR0009723A (de) |
| CA (1) | CA2370133A1 (de) |
| DE (2) | DE19917087C2 (de) |
| DK (1) | DK1169747T3 (de) |
| NZ (1) | NZ514485A (de) |
| WO (1) | WO2000064001A1 (de) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7728700B2 (en) | 2006-07-20 | 2010-06-01 | Kathrein-Werke Kg | High frequency filter in a coaxial construction, in particular in the manner of a high frequency separating filter (for example a duplex separating filter) or a bandpass filter or band-stop filter |
| US8947179B2 (en) | 2010-12-23 | 2015-02-03 | Kathrein-Werke Kg | Tunable high-frequency filter |
| US10644376B2 (en) | 2014-02-13 | 2020-05-05 | Kathrein-Werke Kg | High-frequency filter having a coaxial structure |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FI119207B (fi) | 2003-03-18 | 2008-08-29 | Filtronic Comtek Oy | Koaksiaaliresonaattorisuodatin |
| DE10320620B3 (de) | 2003-05-08 | 2004-11-04 | Kathrein-Werke Kg | Hochfrequenzweiche |
| DE102004010683B3 (de) | 2004-03-04 | 2005-09-08 | Kathrein-Werke Kg | Hochfrequenzfilter |
| FI20041546A7 (fi) * | 2004-11-30 | 2006-05-31 | Filtronic Comtek Oy | Lämpötilakompensoitu resonaattori |
| DE602005022864D1 (de) * | 2005-09-06 | 2010-09-23 | Panasonic Corp | Temperaturkompensation von Kammleitungsformresonatoren mit zusammentgesetztem Innenleiter |
| GB2456738B (en) * | 2007-01-15 | 2011-08-10 | Isotek Electronics Ltd | TEM mode resonator |
| KR101012776B1 (ko) * | 2010-08-26 | 2011-02-08 | 주식회사 이너트론 | 다단 공진기 및 그를 이용한 하우징 필터 |
| DE102012020979A1 (de) | 2012-10-25 | 2014-04-30 | Kathrein-Werke Kg | Abstimmbares Hochfrequenzfilter |
| KR101730084B1 (ko) | 2015-04-20 | 2017-04-25 | 주식회사 케이엠더블유 | 캐비티 구조를 가진 무선 주파수 필터 |
| KR101906464B1 (ko) * | 2017-01-11 | 2018-10-10 | (주)웨이브텍 | 마이크로웨이브 공진기 |
| WO2019024082A1 (en) * | 2017-08-04 | 2019-02-07 | Nokia Solutions And Networks Oy | BANDPASS FILTERS AND ASSOCIATED METHODS |
| KR101927956B1 (ko) | 2017-11-06 | 2018-12-12 | 주식회사 이엠따블유 | 가변 공진소자를 구비한 캐비티 필터 |
| KR102285497B1 (ko) | 2020-05-14 | 2021-08-03 | 주식회사 엘트로닉스 | 동축 고주파 필터 및 이를 구비하는 통신 기기 |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL137559C (de) * | 1959-06-30 | |||
| US3443244A (en) * | 1967-08-23 | 1969-05-06 | Varian Associates | Coaxial resonator structure for solid-state negative resistance devices |
| DE2136728A1 (de) * | 1971-07-22 | 1973-02-01 | Spinner Georg | Ankopplung eines koaxialen resonators |
| FR2488056A1 (fr) * | 1980-07-29 | 1982-02-05 | Thomson Csf | Resonateur accordable et circuit hyperfrequence comportant au moins un tel resonateur |
| FR2507018A1 (fr) * | 1981-06-02 | 1982-12-03 | Thomson Csf | Resonateur hyperfrequence du type condensateur variable a dielectrique |
-
1999
- 1999-04-15 DE DE19917087A patent/DE19917087C2/de not_active Expired - Fee Related
-
2000
- 2000-04-13 AU AU44004/00A patent/AU769264B2/en not_active Ceased
- 2000-04-13 DK DK00925207T patent/DK1169747T3/da active
- 2000-04-13 BR BR0009723-3A patent/BR0009723A/pt not_active IP Right Cessation
- 2000-04-13 NZ NZ514485A patent/NZ514485A/en not_active IP Right Cessation
- 2000-04-13 KR KR1020017012113A patent/KR20010112362A/ko not_active Ceased
- 2000-04-13 AT AT00925207T patent/ATE219862T1/de not_active IP Right Cessation
- 2000-04-13 DE DE50000248T patent/DE50000248D1/de not_active Expired - Lifetime
- 2000-04-13 JP JP2000613031A patent/JP2002542695A/ja active Pending
- 2000-04-13 CA CA002370133A patent/CA2370133A1/en not_active Abandoned
- 2000-04-13 WO PCT/EP2000/003302 patent/WO2000064001A1/de not_active Ceased
- 2000-04-13 CN CNB00806248XA patent/CN1166027C/zh not_active Expired - Lifetime
- 2000-04-13 EP EP00925207A patent/EP1169747B1/de not_active Expired - Lifetime
Non-Patent Citations (1)
| Title |
|---|
| See references of WO0064001A1 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7728700B2 (en) | 2006-07-20 | 2010-06-01 | Kathrein-Werke Kg | High frequency filter in a coaxial construction, in particular in the manner of a high frequency separating filter (for example a duplex separating filter) or a bandpass filter or band-stop filter |
| US8947179B2 (en) | 2010-12-23 | 2015-02-03 | Kathrein-Werke Kg | Tunable high-frequency filter |
| US10644376B2 (en) | 2014-02-13 | 2020-05-05 | Kathrein-Werke Kg | High-frequency filter having a coaxial structure |
Also Published As
| Publication number | Publication date |
|---|---|
| DE19917087A1 (de) | 2000-11-02 |
| AU769264B2 (en) | 2004-01-22 |
| HK1044633A1 (en) | 2002-10-25 |
| BR0009723A (pt) | 2002-01-02 |
| KR20010112362A (ko) | 2001-12-20 |
| AU4400400A (en) | 2000-11-02 |
| DE50000248D1 (de) | 2002-08-01 |
| CA2370133A1 (en) | 2000-10-26 |
| CN1166027C (zh) | 2004-09-08 |
| JP2002542695A (ja) | 2002-12-10 |
| DE19917087C2 (de) | 2001-07-26 |
| ATE219862T1 (de) | 2002-07-15 |
| CN1347578A (zh) | 2002-05-01 |
| DK1169747T3 (da) | 2002-10-14 |
| WO2000064001A1 (de) | 2000-10-26 |
| NZ514485A (en) | 2003-09-26 |
| EP1169747B1 (de) | 2002-06-26 |
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