CN1347578A - High-frequency filter - Google Patents
High-frequency filter Download PDFInfo
- Publication number
- CN1347578A CN1347578A CN00806248A CN00806248A CN1347578A CN 1347578 A CN1347578 A CN 1347578A CN 00806248 A CN00806248 A CN 00806248A CN 00806248 A CN00806248 A CN 00806248A CN 1347578 A CN1347578 A CN 1347578A
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- CN
- China
- Prior art keywords
- high frequency
- inner wire
- frequency filter
- tuned cell
- dielectric
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- 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
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- 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)
Abstract
The invention relates to an improved high-frequency coaxial-type filter which consists of one or more resonators or coaxial filters and which is characterised by: an electrically conductive external conductor (1); an electrically conductive internal conductor (3); a floor (5) which electrically connects the external and internal conductors (1, 3); a housing cover (25) which is opposite the floor (5) and which covers the high frequency filter; and an adjusting or modulating element (17) which is located in or is plunged into the internal conductor (3) at different relative heights in relation thereto; the adjusting element (7) comprises a plunger or modulating element (17), consisting of dielectric material and the plunger or modulating element (17) is supported at a point which is offset in relation to the housing cover (25).
Description
The present invention relates to a kind of high frequency filter of coaxial configuration as described in the preamble as claimed in claim 1.
This high frequency filter can be made of the single resonator of the coaxial technology of one or more employings.
The high frequency filter of this class coaxial configuration for example is applied to radiotechnics equipment usually in the mobile wireless field.At this, they be such as can being applied among the mobile radio base station, and are used to select the frequency band that transmits and receives be scheduled to.
DE 21 36 728 A1 disclosed a kind of coaxial resonator, and it comprises that a cylinder blanket that links to each other with base and one and outer conductor are the inner conductor pipe of coaxial setting.Described columniform inner conductor pipe has held an inner wire section columniform, that slide in this inner conductor pipe.Carry out tuning by the end of moving described inner wire section with respect to described inner conductor pipe at correspondent frequency.To this, described inner wire is built in the tube-in-tube structure that links to each other with described end, and this sleeve then is held and is anchored on the open end place, top of described outer conductor pipe in the zone of the cover plate that need are installed.
In addition, also known another kind of high frequency filter, it adopts the tuning relevant frequency band of screw element, described screw element is disposed on the cover plate that its basic structure is columniform single resonator, and is inserted in the inner wire of described coaxial single tuner by screwing in screwing out with the different degree of depth.Thus also can be as in DE 21 36 728, making resonator change electric capacity, and utilize this capacitance variations to realize the change of frequency.
Also disclosed a kind of high-frequency reonsator at last in EP 0 068 919 A1, it has a kind of and the perpendicular adjusting device of longitudinal axis resonator, among this adjusting device can radially screw in and screw out the next door of described resonator from the outside with the different degree of depth.Simultaneously, also have in the inside of described adjusting device one with the axial perpendicular of described resonator and the probe that constitutes by dielectric material so that by regulating described adjusting device and realizing the variation of electric capacity and frequency by moving radially the described probe that constitutes by dielectric material.
Yet the existing high frequency filter of described coaxial configuration all has some shortcomings.
The shortcoming of described tuning scheme is, the component damage of tuned frequency the uniformity on filter inner conductive surface (such as the transmission range of sliding contact, welding position, different materials, or the like), and the uncertain contact on the relevant contact position can cause frequency characteristic to produce disadvantageous variation (internal modulation).
In addition, this tuner also needs very important area.
Another shortcoming that it may be noted that is that variations in temperature also can exert an influence to frequency characteristic.
Task of the present invention is to create a kind of high frequency filter of improved relatively coaxial configuration.
According to the present invention, this task is solved by the characteristic of claim 1.Preferred extension of the present invention is provided by dependent claims.
The present invention utilizes simple device to realize vast improvement with respect to conventional high frequency filter.
By using a kind of can being adjusted to axially to be inserted into dielectric tuning element in the inner wire of described coaxial filter with different height and positions, can carry out frequency tuning without a doubt, thereby and can therefore not produce uncertain contact and cause unfavorable passive internal modulation.
Simultaneously, in a kind of preferred embodiment of the present invention, described tuned cell that be made up of dielectric material, that be inserted among the coaxial inner conductor is not to be anchored on the cover plate of high frequency filter as prior art.Therefore this grappling of the present invention can advantageously realize: when temperature raise, formed electric capacity had been lowered between the open end of described inner wire and cover plate of outer casing, can make the described filter generation temperature-compensating relevant with frequency thus.
At this advantageously, described electrically conductive tuning elements is supported on different height and positions in the described inner wire adjustablely, preferably is supported in the base area of described coaxial filter element, so that realize above-mentioned temperature-compensating.
At this, adopt dielectric material to be proved to be very favorable with as far as possible little temperature expansion coefficient.The following material of preferred employing, its dielectric constant has negative temperature coefficient.
Elaborate the present invention by accompanying drawing below.Wherein:
Fig. 1 shows the axial section of the high frequency filter of the present invention of single tuner form; And
Fig. 2 shows along the horizontal sectional drawing of the II-III line among Fig. 1.
Fig. 1 and 2 shows single resonator in the coaxial technology with the form of axial sectional side elevation and cross-sectional figure respectively, and it is called coaxial resonator or coaxial filter hereinafter for short.
Described resonator by outer conductor 1, be inner wire 3 and base 5 concentric or that arrange coaxially with this outer conductor 1 in an illustrated embodiment and form, the outer conductor 1 of wherein said conduction and the inner wire 3 of conduction by this base 5 mutually electrical connections get up.
In an illustrated embodiment, the inside of described inner wire 3 is provided with an adjustment element 7 that is positioned at base area, should adjust element in an illustrated embodiment and be made of spiral shell dish or plug screw 7 '.This spiral shell dish or plug screw 7 ' have a kind of external screw thread 9 in its exterior circumferential, described external screw thread is meshed with corresponding internal thread 11, and this internal thread 11 is installed in the inboard of inner wire 3 at least and/or is installed in the inboard of axially being located at the opening 13 in the base 5 with enough axial length.In an illustrated embodiment, described spiral shell dish or plug screw 7 ' have a rotation or driven accessary 15, so that for example rotate described adjustment element 7 by screwdriver, move this adjustment element with respect to inner wire thus, wherein described in an illustrated embodiment rotation or driven accessary 15 are a kind of notch.
Installed a kind of insertion or tuned cell 17 of needle-like on described adjustment element 7 regularly, it is configured to needle-like or cylindrical in an illustrated embodiment.At this, so select length, external diameter, dielectric constant and the fixing point of this dielectric tuning element or cylinder 17, make can in required frequency range, adjust required resonance frequency thus.
At this moment, realize the adjustment of frequency and tuning by rotating described adjustment element 7, thus can be according to the direction shown in the double-head arrow 21 in the inside of inner wire 3 to regulate described adjustment element 7 with respect to the different axial heights of inner wire 3 with dielectric tuning element 17.
From shown in embodiment as can be seen, compare with the height of outer conductor 1, the upper end of described inner wire 3 is lower than the top edge 23 of outer conductor 1 with about 10～20% of described outer conductor axial length, and is lower than conductive cover plate 25 thus.At this, dielectric tuning element 17 for example exceeds the top edge 27 of described inner wire 3 with less size and is positioned at above it.
Adjust element 7 and change the position of adjusting element 17 thus by rotation, can change at the open end of described inner wire and the electric capacity between the cover plate of outer casing, and change resonance frequency thus, thereby realize best adjustment and tuning.
From shown in embodiment it can also be seen that dielectric tuning element 17 does not contact with inner wire 3 itself.If the fixing of described tuned cell only utilizes the set screw-threaded engagement of there to realize by adjusting element 7, so just can not produce on contact position brings the uncertain of adverse effect to contact to electric capacity and frequency characteristic, in an illustrated embodiment, described screw-threaded engagement is to realize in the lower area of described inner wire 3, but it in addition can be preferably only in base area or realization in the zone of adjacent with it inner wire 3.
But shown in structure also have some other significant advantage because it can realize temperature-compensating.
For this reason, can select a kind of dielectric tuning element with following temperature coefficient of expansion, this coefficient is less than the outer conductor of described coaxial filter and/or the temperature coefficient of inner wire 1,3.So under the situation that temperature raises, it is more longer that described inner wire and outer conductor will become, and that is to say that their change intensity is greater than the length variations of described dielectric tuning element.At this, when temperature raises, the electric capacity that is produced between the open end of inner wire and cover plate of outer casing has been lowered, because the elongation of described dielectric tuning device 17 does not have described inner wire/outer conductor severe like that, like this, the frequency that causes because of the strong elongation of described inner wire/outer conductor reduces to reduce by the electric capacity that is produced simultaneously and compensates.Therefore, this characteristic can be by selecting suitable dielectric material to obtain optimization for described tuned cell 17.At this, the dielectric material of being made up of pottery is very suitable.Simultaneously, it is proper having the material that very low temperature expansion coefficient and its relative dielectric constant have a lower temperature coefficient.
Claims (11)
1. the high frequency filter of coaxial configuration, it is made up of one or more resonators, and has following feature:
-have an outer conductor (1) of conduction,
-have an inner wire (3) of conduction,
-have described outer conductor and inner wire (1,3) are electrically connected the base (5) of getting up,
-the cover plate of outer casing (25) that described high frequency filter covered with respect to described base (5),
-but also have a kind of insertion or tuned cell (17) that changes resonance frequency, described insertion or tuned cell with respect to described inner wire (3) with different axial locations or height and position and be inserted in this inner wire or be positioned at this inner wire,
It is characterized in that following further feature:
-described adjustment element (7) comprises a kind of insertion or tuned cell (17) that is made of dielectric material, and
-described insertion or tuned cell (17) are supported on a kind of can carrying out on the Support Position of displacement with respect to described cover plate of outer casing (25).
2. high frequency filter as claimed in claim 1 is characterized in that:
Described insertion or tuned cell (17) are held and are supported on the inside of described inner wire (3), and/or are held and are supported in opening (13) zone of described base (5).
3. high frequency filter as claimed in claim 1 or 2 is characterized in that:
Described adjustment element (7) has a kind of spiral shell dish or plug screw (7 ') that is provided with external screw thread (9), utilizes internal thread (11) that described adjustment element (7) is connected thus and remains on the inside of described inner wire (3) and/or opening (13) inside of described base (5).
4. as each described high frequency filter in the claim 1～3, it is characterized in that:
The insertion of described conduction or tuned cell (17) are installed on the described adjustment element (7), and can adjust element (7) with this and be fixed together and regulate.
5. as each described high frequency filter in the claim 1～4, it is characterized in that:
The insertion of described dielectric or tuned cell (17) are higher than the top edge (27) of described inner wire (3) with small size at least or thereunder stop.
6. as each described high frequency filter in the claim 1～5, it is characterized in that:
The temperature expansion coefficient of the insertion of described dielectric or tuned cell (17) is different from the temperature expansion coefficient of described inner wire or outer conductor (3,1).
7. high frequency filter as claimed in claim 6 is characterized in that:
The temperature expansion coefficient of the insertion of described dielectric or tuned cell (17) is less than the temperature expansion coefficient of described inner wire or outer conductor (3,1).
8. as claim 6 or 7 described high frequency filters, it is characterized in that:
The temperature coefficient of the dielectric constant of described insertion or tuned cell (17) is a negative value.
9. as each described high frequency filter in the claim 1～8, it is characterized in that:
The insertion of described dielectric or tuned cell (17) are made up of ceramic material.
10. as each described high frequency filter in the claim 1～9, it is characterized in that:
The insertion of described dielectric or tuned cell (17) are by aluminium oxide ceramics, especially Al
2O
3Pottery is formed.
11., it is characterized in that as each described high frequency filter in the claim 2～10:
Described spiral shell dish or plug screw (7 ') are made of metal.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19917087.8 | 1999-04-15 | ||
| DE19917087A DE19917087C2 (en) | 1999-04-15 | 1999-04-15 | High frequency filter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1347578A true CN1347578A (en) | 2002-05-01 |
| CN1166027C CN1166027C (en) | 2004-09-08 |
Family
ID=7904702
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB00806248XA Expired - Lifetime CN1166027C (en) | 1999-04-15 | 2000-04-13 | High-frequency filter |
Country Status (13)
| Country | Link |
|---|---|
| EP (1) | EP1169747B1 (en) |
| JP (1) | JP2002542695A (en) |
| KR (1) | KR20010112362A (en) |
| CN (1) | CN1166027C (en) |
| AT (1) | ATE219862T1 (en) |
| AU (1) | AU769264B2 (en) |
| BR (1) | BR0009723A (en) |
| CA (1) | CA2370133A1 (en) |
| DE (2) | DE19917087C2 (en) |
| DK (1) | DK1169747T3 (en) |
| HK (1) | HK1044633A1 (en) |
| NZ (1) | NZ514485A (en) |
| WO (1) | WO2000064001A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103262338A (en) * | 2010-12-23 | 2013-08-21 | 凯瑟雷恩工厂两合公司 | Tunable high-frequency filter |
| WO2019024082A1 (en) * | 2017-08-04 | 2019-02-07 | Nokia Solutions And Networks Oy | Bandpass filters and associated methods. |
Families Citing this family (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FI119207B (en) * | 2003-03-18 | 2008-08-29 | Filtronic Comtek Oy | Koaxialresonatorfilter |
| DE10320620B3 (en) | 2003-05-08 | 2004-11-04 | Kathrein-Werke Kg | High crossover |
| KR100769657B1 (en) * | 2003-08-23 | 2007-10-23 | 주식회사 케이엠더블유 | Radio frequency band variable filter |
| DE102004010683B3 (en) | 2004-03-04 | 2005-09-08 | Kathrein-Werke Kg | High frequency filter in coaxial resonator configuration, used in mobile telephone, includes dielectric layer between cover and free end of inner conducting tube |
| FI20041546A (en) * | 2004-11-30 | 2006-05-31 | Filtronic Comtek Oy | Temperature compensated resonator |
| DE602005022864D1 (en) * | 2005-09-06 | 2010-09-23 | Panasonic Corp | Temperature compensation of comb line form resonators with assembled inner conductor |
| DE102006033704B3 (en) | 2006-07-20 | 2008-01-03 | Kathrein-Werke Kg | High frequency coaxial type filter comprises one or multiple resonators, which has housing with inner space, and housing has two rear walls, which lies together and offset in axial direction |
| GB2456738B (en) * | 2007-01-15 | 2011-08-10 | Isotek Electronics Ltd | TEM mode resonator |
| KR101012776B1 (en) * | 2010-08-26 | 2011-02-08 | 주식회사 이너트론 | Multi-stage resonator and housing filter using the same |
| DE102012020979A1 (en) | 2012-10-25 | 2014-04-30 | Kathrein-Werke Kg | Tunable high frequency filter |
| DE102014001917A1 (en) | 2014-02-13 | 2015-08-13 | Kathrein-Werke Kg | High frequency filter in coaxial design |
| KR101730084B1 (en) | 2015-04-20 | 2017-04-25 | 주식회사 케이엠더블유 | Radio frequency filter with cavity structure |
| KR101906464B1 (en) * | 2017-01-11 | 2018-10-10 | (주)웨이브텍 | Microwave Resonator |
| KR101927956B1 (en) | 2017-11-06 | 2018-12-12 | 주식회사 이엠따블유 | Tunable cavity filter having variable resonance element |
| KR102285497B1 (en) | 2020-05-14 | 2021-08-03 | 주식회사 엘트로닉스 | Coaxial microwave filter and communication device with the same |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL137559C (en) * | 1959-06-30 | |||
| US3443244A (en) * | 1967-08-23 | 1969-05-06 | Varian Associates | Coaxial resonator structure for solid-state negative resistance devices |
| DE2136728A1 (en) * | 1971-07-22 | 1973-02-01 | Spinner Georg | COUPLING OF A COAXIAL RESONATOR |
| FR2488056A1 (en) * | 1980-07-29 | 1982-02-05 | Thomson Csf | TUNABLE RESONATOR AND MICROWAVE CIRCUIT COMPRISING AT LEAST ONE SUCH RESONATOR |
| FR2507018A1 (en) * | 1981-06-02 | 1982-12-03 | Thomson Csf | MICROWAVE RESONATOR OF THE VARIABLE TO DIELECTRIC CAPACITOR TYPE |
-
1999
- 1999-04-15 DE DE19917087A patent/DE19917087C2/en not_active Expired - Fee Related
-
2000
- 2000-04-13 AT AT00925207T patent/ATE219862T1/en not_active IP Right Cessation
- 2000-04-13 CA CA002370133A patent/CA2370133A1/en not_active Abandoned
- 2000-04-13 EP EP00925207A patent/EP1169747B1/en not_active Expired - Lifetime
- 2000-04-13 KR KR1020017012113A patent/KR20010112362A/en not_active Application Discontinuation
- 2000-04-13 AU AU44004/00A patent/AU769264B2/en not_active Ceased
- 2000-04-13 BR BR0009723-3A patent/BR0009723A/en not_active IP Right Cessation
- 2000-04-13 JP JP2000613031A patent/JP2002542695A/en active Pending
- 2000-04-13 DE DE50000248T patent/DE50000248D1/en not_active Expired - Lifetime
- 2000-04-13 NZ NZ514485A patent/NZ514485A/en not_active IP Right Cessation
- 2000-04-13 WO PCT/EP2000/003302 patent/WO2000064001A1/en not_active Application Discontinuation
- 2000-04-13 DK DK00925207T patent/DK1169747T3/en active
- 2000-04-13 CN CNB00806248XA patent/CN1166027C/en not_active Expired - Lifetime
-
2002
- 2002-08-19 HK HK02106039A patent/HK1044633A1/en unknown
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103262338A (en) * | 2010-12-23 | 2013-08-21 | 凯瑟雷恩工厂两合公司 | Tunable high-frequency filter |
| US8947179B2 (en) | 2010-12-23 | 2015-02-03 | Kathrein-Werke Kg | Tunable high-frequency filter |
| CN103262338B (en) * | 2010-12-23 | 2016-02-03 | 凯瑟雷恩工厂两合公司 | Tunable high frequency filter |
| WO2019024082A1 (en) * | 2017-08-04 | 2019-02-07 | Nokia Solutions And Networks Oy | Bandpass filters and associated methods. |
Also Published As
| Publication number | Publication date |
|---|---|
| KR20010112362A (en) | 2001-12-20 |
| EP1169747B1 (en) | 2002-06-26 |
| ATE219862T1 (en) | 2002-07-15 |
| WO2000064001A1 (en) | 2000-10-26 |
| BR0009723A (en) | 2002-01-02 |
| DE50000248D1 (en) | 2002-08-01 |
| EP1169747A1 (en) | 2002-01-09 |
| AU4400400A (en) | 2000-11-02 |
| CA2370133A1 (en) | 2000-10-26 |
| DK1169747T3 (en) | 2002-10-14 |
| CN1166027C (en) | 2004-09-08 |
| DE19917087A1 (en) | 2000-11-02 |
| NZ514485A (en) | 2003-09-26 |
| AU769264B2 (en) | 2004-01-22 |
| DE19917087C2 (en) | 2001-07-26 |
| JP2002542695A (en) | 2002-12-10 |
| HK1044633A1 (en) | 2002-10-25 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20191220 Address after: Rosenheim, Germany Patentee after: Kaiserlin Europe Co., Ltd. Address before: Rosenheim, Germany Patentee before: Kathrein-Werke Kg |
|
| TR01 | Transfer of patent right | ||
| CX01 | Expiry of patent term |
Granted publication date: 20040908 |
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| CX01 | Expiry of patent term |