EP1721359A1 - Hochfrequenzfilter - Google Patents
HochfrequenzfilterInfo
- Publication number
- EP1721359A1 EP1721359A1 EP05715703A EP05715703A EP1721359A1 EP 1721359 A1 EP1721359 A1 EP 1721359A1 EP 05715703 A EP05715703 A EP 05715703A EP 05715703 A EP05715703 A EP 05715703A EP 1721359 A1 EP1721359 A1 EP 1721359A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- dielectric layer
- frequency filter
- filter according
- inner conductor
- conductor tube
- 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 description 63
- 239000000853 adhesive Substances 0.000 claims description 4
- 230000001070 adhesive effect Effects 0.000 claims description 4
- 229910010293 ceramic material Inorganic materials 0.000 claims description 2
- 230000001419 dependent effect Effects 0.000 claims description 2
- 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
- 239000000463 material Substances 0.000 description 6
- 239000003989 dielectric material Substances 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
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
- H01P1/205—Comb or interdigital filters; Cascaded coaxial cavities
-
- 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
- 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
- H01P7/00—Resonators of the waveguide type
- H01P7/04—Coaxial resonators
Definitions
- the invention relates to a high-frequency filter in a coaxial design, in particular in the manner of a high-frequency filter (such as a duplex filter) or a bandpass filter or band-stop filter.
- a high-frequency filter such as a duplex filter
- a bandpass filter or band-stop filter such as a duplex filter
- a common antenna is often used for transmit and receive signals in radio-technical systems, in particular in the mobile radio sector.
- the transmit and receive signals each use different frequency ranges, and the antenna must be suitable for sending and receiving in both frequency ranges.
- a suitable frequency filtering is therefore necessary, with which the transmit signals are passed on from the transmitter to the antenna on the one hand and the receive signals from the antenna to the receiver on the other.
- high-frequency filters in a coaxial construction are used to divide the transmit and receive signals. For example, a pair of high-frequency filters can be used, both of which pass a certain frequency band (band-pass filter). Alternatively, a pair of high-frequency filters can be used, both of which block a certain frequency band (band-stop filter).
- a pair of high-frequency filters can be used, one of which passes frequencies below a frequency between the transmitting and receiving bands and blocks frequencies above this frequency (low-pass filter), and the: other filters blocks frequencies below a frequency between the transmitting and receiving bands and above Passes frequencies (high pass filter).
- low-pass filter passes frequencies below a frequency between the transmitting and receiving bands and blocks frequencies above this frequency
- high pass filter blocks frequencies below a frequency between the transmitting and receiving bands and above Passes frequencies
- High-frequency filters are often constructed from coaxial resonators because they consist of milled or cast parts, which makes them easy to manufacture. In addition, these resonators ensure high electrical quality and relatively high temperature stability.
- This filter comprises a resonator with a cylindrical inner conductor and a cylindrical outer conductor, a capacitance being formed between a free end of the inner conductor and a cover fastened to the outer conductor, which has an influence on the resonance frequency.
- the resonator comprises a tuning element made of dielectric material, with which the resonance frequency of the filter can be adjusted.
- the tuning element is movable in the inner conductor • of the resonator, which means that the capacitance between the free end of the inner conductor and the. Lid of the resonator is changed and thereby the Resonance frequency varies.
- Coaxial resonator filters with a large number of coupled individual resonators are known from the publication "Theory and Design of Microveve Filters", Ian Hunter, IEE Electromagnetic Waves Series 48, Section 5.8.
- the object of the present invention is therefore to provide a high-frequency filter in a coaxial design, which has a high dielectric strength with a small overall volume.
- the high-frequency filter according to the invention comprises an electrically conductive inner conductor configured as an inner conductor tube, an electrically conductive outer conductor and an electrically conductive bottom which electrically connects the inner conductor and the outer conductor to one another. Furthermore, a cover is provided which covers the high-frequency filter from the floor. The cover has an inside and an outside, the inside pointing to a free end of the inner conductor tube. A dielectric layer with a relative dielectric constant greater than 2 is arranged in the high-frequency filter between the outside of the cover and the free end of the inner conductor tube. The radial expansion of the dielectric layer essentially covers the cross section of the inner conductor tube at its free end.
- such a dielectric layer achieves an increase in the capacitance and thus a reduction in the resonance frequency without increasing the construction volume. Since the dielectric layer essentially covers the entire cross section of the inner conductor tube, the dielectric strength between the inner conductor tube and the cover is also improved.
- high dielectric material with a relative dielectric constant of greater than or equal to 5, preferably greater than or equal to 8, particularly preferably greater than or equal to 9 is used as the dielectric layer.
- Materials with a much higher dielectric constant can also be used, for example materials with a relative dielectric constant greater than or equal to 40.
- the constant can be between 40 and 80 or between 60 and 80.
- materials with high di- electricity constants are used for the dielectric layer e.g. B. ceramic materials used, especially alumina ceramic.
- the area of the radial extension of the dielectric layer is preferably at least twice the area of the cross section of the inner conductor tube at its free end. In this way, a large covering of the inner conductor tube with dielectric material is achieved, so that a very high dielectric strength is ensured.
- the cross section of the inner conductor tube is essentially circular at its free end.
- the radial extent of the dielectric layer can be essentially circular. If both the cross section of the inner conductor tube at its free end and the radial extension of the dielectric layer are circular, in a preferred variant of the invention the diameter of the radial extension is at least as large as the diameter of the cross section. The diameter of the radial extension is preferably at least 1.5 times the diameter of the cross section.
- the outer conductor can also have a substantially circular cross section, the diameter of which is preferably at least twice the diameter of the radial extension of the dielectric layer.
- the dielectric layer is arranged on the cover of the high-frequency filter, in particular attached to the cover.
- the dielectric layer can be inserted in a receptacle in the inside of the cover.
- the dielectric layer can be held in the receptacle by a positive fit, in particular by an edge protruding beyond the edge of the dielectric layer on the inside of the cover.
- the dielectric layer can be held on the inside of the cover by adhesive means, in particular adhesive.
- the dielectric layer closes with the inside of the cover.
- the Hocfr frequency filter has a plurality of resonators, a single continuous, at least partially strip-shaped dielectric layer being provided for all resonators.
- the high-frequency filter according to the invention is preferably designed such that a duplex filter is formed by the design and coupling of the resonators.
- a duplex filter is formed by the design and coupling of the resonators.
- an embodiment as a bandpass filter or bandstop filter is also conceivable.
- FIG. 1 the side view of an embodiment of a resonator used in the high-frequency filter according to the invention
- Figure 2 is a plan view of the resonator of Figure 1;
- Figure 3 is a plan view of a modification of the resonator of Figure 2;
- Figure 4 is a plan view of the inside of the resonator cover according to an embodiment of the invention.
- FIG. 5 shows a plan view of a bandpass filter in which several resonators according to FIG. 3 are used.
- FIG. 6 shows a sectional view along the line I-I of the bandpass filter of FIG.
- FIG. 1 shows the side view of a resonator for use in a high-frequency filter according to the invention. It is a resonator in a coaxial design, which extends along the axis A.
- the resonator comprises an electrically conductive cylindrical inner conductor tube 1, the lower end 1b of which is inserted in a base 3.
- the bottom 3 is also cylindrical and is connected at its outer edge to a cylindrical outer conductor tube 2.
- An electrically conductive connection between the outer conductor tube 2 and the inner conductor tube 1 is established via the base 3.
- a cover 5 with the inside 5a and the outside 5b is located on the outer conductor tube.
- a dielectric 6 shown in black is inserted in a receptacle on the inside 5a.
- the dielectric lies opposite a free end 1 a of the inner conductor tube 1.
- the distance 4 between the cover 5 and the free end 1 a of the inner conductor tube 1 is usually 3 to 4 mm and can be reduced to up to 0.5 mm.
- the dielectric layer closes with the inside of the Cover. It is also possible for the dielectric layer to protrude from the inside of the cover or for the inside of the cover to protrude beyond the dielectric layer.
- the top of the free end of the inner conductor tube 1 and the inside 5a of the cover form a plate capacitor, whose capacitance C D a c is directly proportional to the relative dielectric constant ⁇ r of the material between the capacitor.
- high-dielectric material 6 with a relative dielectric constant ⁇ r is used, which is well above air.
- the relative dielectric constant preferably has values above 40. This means that the capacity C roof - in contrast to conventional resonators - is very high.
- the capacitance C roof represents a parallel capacitance to the actual resonator and is related to the resonance frequency of the resonator as follows:
- f represents the resonance frequency of the resonator
- L the inductance of the resonator
- C the capacitance of the resonator
- C roof the described parallel capacitance at the top of the resonator.
- FIG. 2 shows a plan view of the resonator of FIG. 1. It can be seen here in particular that the inner conductor tube 1 and the outer conductor tube 2 are cylindrical. In addition, there is the radial expansion of the dielectric layer 6, the circular edge of which is denoted by 6 'in FIG. 2. So that there is a high dielectric strength even with small distances between the free end la of the inner conductor tube and the cover 5, the diameter d x of the dielectric layer is larger than the diameter d 2 of the cross section of the inner conductor tube. The diameter ⁇ t is preferably 1.5 times the diameter d 2 . The diameter d 3 of the outer conductor tube is significantly larger than the diameters d x and d 2 .
- the diameter d 3 is twice as large as the diameter
- FIG. 3 shows a plan view of a modification of the resonator of FIG. 2.
- the outer conductor 2 is not cylindrical, but essentially square with rounded corners.
- the shape of the inner conductor 1 and the dielectric layer 6 is also cylindrical or circular. However, it is also conceivable for the inner conductor tube or the dielectric layer to have other shapes, in particular they can also be square. It is only necessary to ensure that the radial expansion of the dielectric layer has at least a size which corresponds to the cross-sectional area of the inner conductor tube.
- FIG. 4 shows a plan view of a possible configuration of the inside 5a of the cover 5 from FIG. 1.
- the inside of the cover is shown hatched. It can be seen that an inner edge 5 ′ of the cover protrudes over the dielectric layer 6. This ensures that the dielectric layer is held in the receptacle of the cover 5 by means of a positive connection.
- a variety of other holding mechanisms for holding the dielectric layer 6 in the cover 5 are also possible.
- the dielectric layer 6 can be glued into the receptacle.
- FIG. 5 shows the top view of a bandpass filter in which four of the resonators of FIG. 3 are used, the cover of the resonators not being shown.
- the outer conductors of the individual resonators are connected to one another via diaphragms 7, so that an entire circumferential housing 2 'is formed.
- the degree of coupling is determined by the distance between the resonators and by the size of the aperture.
- the center frequency of the bandpass filter is proportional to the length of the inner conductor tube 1.
- FIG. 6 shows a sectional view of the bandpass filter according to FIG. 5 along the line I-I, the lid of the bandpass filter being attached to the top. It can be seen that a continuous cover 5 "rests on the top of the housing 2 '.
- a dielectric layer 6 is again provided opposite the free end 1 a of the respective inner conductor 1, through which the dielectric strength and the size of the bandpass filter Alternatively, a single continuous dielectric layer in the form of a strip can be provided, the strip extending in the longitudinal direction of the housing 2 'and having a width such that each inner conductor tube is covered by the strip.
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102004010683A DE102004010683B3 (de) | 2004-03-04 | 2004-03-04 | Hochfrequenzfilter |
| PCT/EP2005/002248 WO2005086275A1 (de) | 2004-03-04 | 2005-03-03 | Hochfrequenzfilter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1721359A1 true EP1721359A1 (de) | 2006-11-15 |
| EP1721359B1 EP1721359B1 (de) | 2007-06-13 |
Family
ID=34833100
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP05715703A Expired - Lifetime EP1721359B1 (de) | 2004-03-04 | 2005-03-03 | Hochfrequenzfilter |
Country Status (8)
| Country | Link |
|---|---|
| US (1) | US7486162B2 (de) |
| EP (1) | EP1721359B1 (de) |
| KR (1) | KR101157689B1 (de) |
| AT (1) | ATE364909T1 (de) |
| DE (2) | DE102004010683B3 (de) |
| DK (1) | DK1721359T3 (de) |
| ES (1) | ES2285684T3 (de) |
| WO (1) | WO2005086275A1 (de) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
|---|---|---|---|---|
| US7853325B2 (en) * | 2001-04-13 | 2010-12-14 | Greatbatch Ltd. | Cylindrical bandstop filters for medical lead systems |
| DE102006033704B3 (de) | 2006-07-20 | 2008-01-03 | Kathrein-Werke Kg | Hochfrequenzfilter in koaxialer Bauweise, insbesondere nach Art einer Hochfrequenzweiche (z.B. einer Duplex-Weiche) oder eines Bandpassfilters oder Bandsperrfilters |
| US7911297B2 (en) * | 2006-08-31 | 2011-03-22 | Panasonic Corporation | Filter device and method for manufacturing the same |
| US7570136B2 (en) * | 2006-09-20 | 2009-08-04 | Alcatel-Lucent Usa Inc. | Re-entrant resonant cavities, filters including such cavities and method of manufacture |
| DE102007061413A1 (de) | 2007-12-11 | 2009-06-25 | Telegärtner Karl Gärtner GmbH | Hochpassfilter |
| US8362853B2 (en) | 2009-06-19 | 2013-01-29 | Qualcomm Incorporated | Tunable MEMS resonators |
| WO2013129817A1 (ko) * | 2012-02-27 | 2013-09-06 | 주식회사 케이엠더블유 | 캐비티 구조를 가진 무선 주파수 필터 |
| KR101869757B1 (ko) | 2012-02-27 | 2018-06-21 | 주식회사 케이엠더블유 | 캐비티 구조를 가진 무선 주파수 필터 |
| KR20160118667A (ko) | 2015-04-02 | 2016-10-12 | 한국전자통신연구원 | 공진기 필터 |
| DE102016104608A1 (de) | 2016-03-14 | 2017-09-14 | Kathrein-Werke Kg | Koaxialfilter in Rahmenbauweise |
| DE102017119907A1 (de) | 2017-08-30 | 2019-02-28 | Kathrein Se | Koaxialfilter |
| KR101939989B1 (ko) * | 2018-08-01 | 2019-01-18 | 주식회사 엘트로닉스 | 고주파 필터 |
| DE102023203996A1 (de) * | 2023-04-28 | 2024-10-31 | Bruker Switzerland Ag | Hochfrequenz-Bandpassfilter für eine MR-Apparatur mit Spulenkörper mit einem Hohlraum, MR-Apparatur |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62123801A (ja) * | 1985-11-25 | 1987-06-05 | Matsushita Electric Ind Co Ltd | 同軸型フイルタ |
| JPH04332202A (ja) * | 1991-05-08 | 1992-11-19 | Kyocera Corp | 分布定数型2分割方式の誘電体共振単位体 |
| DE19917087C2 (de) | 1999-04-15 | 2001-07-26 | Kathrein Werke Kg | Hochfrequenzfilter |
| EP1077514A3 (de) * | 1999-08-19 | 2001-10-24 | FILTEC FILTERTECHNOLOGIE FUR DIE ELEKTRONIKINDUSTRIE GmbH | Mehrfachfilter |
| JP4527924B2 (ja) * | 2000-01-31 | 2010-08-18 | ゼネラル・エレクトリック・カンパニイ | コネクタ支持ブロック |
| SE520203C2 (sv) * | 2000-03-30 | 2003-06-10 | Allgon Ab | En koaxiell kavitetsresonator, filter och användning av resonatorkomponent i ett filter |
| US6452465B1 (en) * | 2000-06-27 | 2002-09-17 | M-Squared Filters, Llc | High quality-factor tunable resonator |
| US6778042B2 (en) * | 2000-10-30 | 2004-08-17 | Kabushiki Kaisha Toshiba | High-frequency device |
| US20060255888A1 (en) * | 2005-05-13 | 2006-11-16 | Kathrein Austria Ges.M.B.H | Radio-frequency filter |
-
2004
- 2004-03-04 DE DE102004010683A patent/DE102004010683B3/de not_active Expired - Fee Related
-
2005
- 2005-03-03 WO PCT/EP2005/002248 patent/WO2005086275A1/de not_active Ceased
- 2005-03-03 DK DK05715703T patent/DK1721359T3/da active
- 2005-03-03 EP EP05715703A patent/EP1721359B1/de not_active Expired - Lifetime
- 2005-03-03 DE DE502005000873T patent/DE502005000873D1/de not_active Expired - Lifetime
- 2005-03-03 KR KR1020067015104A patent/KR101157689B1/ko not_active Expired - Fee Related
- 2005-03-03 ES ES05715703T patent/ES2285684T3/es not_active Expired - Lifetime
- 2005-03-03 US US10/591,637 patent/US7486162B2/en not_active Expired - Lifetime
- 2005-03-03 AT AT05715703T patent/ATE364909T1/de not_active IP Right Cessation
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2005086275A1 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
|---|---|
| KR20060129320A (ko) | 2006-12-15 |
| US20070194865A1 (en) | 2007-08-23 |
| DK1721359T3 (da) | 2007-10-08 |
| ES2285684T3 (es) | 2007-11-16 |
| WO2005086275A1 (de) | 2005-09-15 |
| DE102004010683B3 (de) | 2005-09-08 |
| ATE364909T1 (de) | 2007-07-15 |
| US7486162B2 (en) | 2009-02-03 |
| KR101157689B1 (ko) | 2012-06-20 |
| EP1721359B1 (de) | 2007-06-13 |
| DE502005000873D1 (de) | 2007-07-26 |
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