CN1794514A - Ultra width band wave filter - Google Patents
Ultra width band wave filter Download PDFInfo
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- CN1794514A CN1794514A CN 200510019474 CN200510019474A CN1794514A CN 1794514 A CN1794514 A CN 1794514A CN 200510019474 CN200510019474 CN 200510019474 CN 200510019474 A CN200510019474 A CN 200510019474A CN 1794514 A CN1794514 A CN 1794514A
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Abstract
This invention relates to a super-broad band filter used in a shield chamber with 10KHz-110GHz of filter band and not less than 80dB stopband interpolation loss including a low frequency LC filter and a HF absorption filter including a metallic shell and a shield cavity set in the shell, high performance wave absorbing medium is filled in the shield cavity and said low frequency LC filter is buried in the medium of the shield cavity, which further enlarges the filter bandwidth of the high frequency band, combines filters of high and low frequencies and isolates the inductors to reduce the couple effect of the high frequency interference signals and applies a through condenser to optimize the HF performance.
Description
Technical field
The present invention relates to a kind of ultra-wide band filter that is applicable to shielded enclosure, its filtering frequency range is 10kHz～110GHz, and the resistance in-band insertion loss is not less than 80dB.
Background technology
In recent ten years, as the shielded enclosure of microwave experiment basis facility, the frequency range of its use is constantly expanded, and frequency is high-end to be increased to 20GHz by 1GHz, is increased to 40GHz in recent years again, estimates that following trend also can be increased to 60GHz, even 100GHz.For guaranteeing the shielding properties of shielded enclosure, filter is installed for power line and holding wire in whole working frequency range scope.The filter that is used for shielded enclosure need all have higher insertion loss in the whole working frequency range of shielded enclosure, generally be not less than 80dB.Existing filter adopts elements such as inductance and electric capacity to form the LC filter circuit usually, when operating frequency is higher than 10GHz, because the high-frequency effects in the lc circuit cause such filter filtering decreased performance, the above high filtering requirements of inserting loss of 80dB can't be realized, thereby the instructions for use of radioshielding chamber can not be satisfied.
In Chinese patent " 01266173.2 ", announced a kind of " ultra-wide-band power supply filter that is used for shielded enclosure ", this filter is made up of low frequency LC filter and high frequency absorption formula filter two parts, its filtering frequency range is 10kHz～40GHz, and the higher insertion loss of tool, but its structure is comparatively complicated and loose, volume is big, and the filtering frequency range also remains further to be widened.
Summary of the invention
Technical problem to be solved by this invention is to propose a kind of ultra-wide band filter for the shielded enclosure use at the deficiency of above-mentioned prior art existence, and it has simple and compact for structure, and volume is little, the characteristics that filtered band is wide and serviceability is more excellent.
The present invention for the technical scheme that problem adopted of the above-mentioned proposition of solution is: include low frequency LC filter and high frequency absorption formula filter, described high frequency absorption formula filter comprises metal shell and is located at the interior shielding cavity of housing, filling high-performance electromagnetic wave absorption medium in the shielding cavity, its difference are that described low frequency LC filter is embedded in the high-performance electromagnetic wave absorption medium of shielding cavity.
Press such scheme, described shielding cavity constitutes by installing metal partion (metp) in the metal shell; Described low frequency LC filter is combined by series inductance and shunt capacitance, and the inductance of series connection is provided with 2～6, at each inductance two ends and connect shunt capacitance.Number by inductance in the LC filter is divided into a plurality of shielding cavities with metal casing body metal partion (metp) correspondence, and an inductance is installed in the shielding cavity; Wherein inductance can be common mode inductance, and electric capacity can be feedthrough capacitor.Described high-performance electromagnetic wave absorption medium is evenly mixed to make by high conductive carbon powder, polyaniline, metallic fiber and epoxy resin and forms.
Operation principle of the present invention is as follows: low frequency end is realized the purpose of its low pass by the lc circuit structure of " string sense also hold ", is used for the interference signal of filtering 10kHz～10GHz.Front end is to utilize high-performance electromagnetic wave absorption medium that the high frequency of the 10GHz～110GHz of radiation is attenuated on its transmission path, thereby realizes the purpose of High frequency filter.Realize the filtering requirements of the high loss of ultra broadband by the acting in conjunction of low frequency end and front end.
Beneficial effect of the present invention is:
1, strengthened the filtering performance of 10GHz～110GHz, made the filtering bandwidth of high band further strengthen, the insertion loss of this frequency range reaches more than the 80dB, this be existing filter can't realize.
2, low frequency and high frequency filter are united two into one, not only simple and compact for structure, dwindle volume, and used installation more convenient.
3, the High frequency filter performance is further enhanced, number according to common mode inductance in the LC filter is divided into a plurality of shielding cavities with metal casing body metal partion (metp) correspondence, each inductance is isolated mutually, can reduce the coupling effect of high-frequency interferencing signal, because feedthrough capacitor has very little stray inductance, adopt feedthrough capacitor can help the further optimization of high frequency performance simultaneously.
4, both be suitable for the filtering of holding wire, also can be used for the filtering of power line.
Description of drawings
Fig. 1 is the low frequency LC filter circuit schematic diagram of one embodiment of the invention.
Fig. 2 is the stereochemical structure cutaway view of one embodiment of the invention.
Embodiment
Further specify embodiments of the invention below in conjunction with accompanying drawing, include low frequency LC filter and high frequency absorption formula filter, described low frequency LC filter is combined by series inductance 4 and shunt capacitance 6, the inductance of series connection is provided with 3～4 usually, the inductance of present embodiment is provided with 3 L1, L2, L3, inductance is a common mode inductance, is made of the coil that is wound on the amorphous magnet ring, and its function is to stop interference signal to be passed through; At each inductance two ends and connect shunt capacitance, in the present embodiment between 3 L1, L2, L3 other 8 (4 pairs) capacitor C 1, C2, C3, C4, C5, C6, C7, the C8 of connecing, wherein C1 is connected in series mutually with C2 and the appearance value equates, C3 is connected in series mutually with C4 and the appearance value equates, C5 is connected in series mutually with C6 and the appearance value equates, C7 is connected in series mutually with C8 and the appearance value equates, 4 pairs of other respectively two ends that are connected to 3 inductance of electric capacity, the interlude ground connection of every pair of electric capacity; Described high frequency absorption formula filter comprises a rectangular metal shell 2, longitudinally a plurality of shielding cavities are set in the housing by metal partion (metp) 3, present embodiment is provided with 5 shielding cavities, two ends be respectively input, output shielding cavity, middle 3 is the inductor shield chamber, filling high-performance electromagnetic wave absorption medium 5 in the inductor shield chamber; Above-mentioned low frequency LC filter is embedded in the high-performance electromagnetic wave absorption medium of shielding cavity, common mode inductance L1, L2 wherein, L3 are installed in respectively in middle 3 inductor shield chambeies, and 8 capacitor C 1, C2, C3, C4, C5, C6, C7, C8 are feedthrough capacitor, install the both sides in metal partion (metp).Described high-performance electromagnetic wave absorption medium evenly mixes system curing by high conductive carbon powder, polyaniline, metallic fiber and epoxy resin and forms, and its mixed proportion can be by weight: high conductive carbon powder: polyaniline: metallic fiber: epoxy resin=1: 1: 1: 10.In addition, be outside equipped with erection column 7 at metal shell, be used to hang and be connected to the wall of shielded enclosure outside, the wiring at filter two ends is lead-in and lead-out wire, and wherein lead-in 1 is connected with the circuit of shielded enclosure outside, as input; Lead-out wire 8 enters shielded enclosure, is connected with the circuit of shielded enclosure inside, as output.
The parameter of present embodiment low frequency LC filter inductance electric capacity is: C1=C2=115nF, C3=C4=175nF, C5=C6=175nF, C7=C8=115nF, L1=30mH, L2=32mH, L3=30mH.Be configured for the low pass mode filter of telephone wire, have following technical indicator: input impedance is 600 Ω, and cut-off frequecy of passband is 3.4kHz, and the filtering frequency range is 10kHz～110GHz, and the resistance in-band insertion loss is not less than 80dB.
Following table is inserted the test data of loss for the present embodiment ultra-wide band filter.In the scope of filtering frequency range 10kHz～110GHz, insert loss value as can be seen all greater than 80dB.
| Test frequency/Hz | Insert loss/dB |
| 10k | 83 |
| 20k | 98 |
| 50k | 95 |
| 100k | 102 |
| 500k | 93 |
| 1M | 98 |
| 5M | 103 |
| 10M | 96 |
| 50M | 92 |
| 100M | 95 |
| 500M | 99 |
| 1G | 102 |
| 2G | 95 |
| 5G | 88 |
| 10G | 98 |
| 15G | 103 |
| 20G | 95 |
| 25G | 101 |
| 30G | 100 |
| 35G | 98 |
| 40G | 102 |
| 45G | 105 |
| 50G | 93 |
| 60G | 95 |
| 70G | 95 |
| 80G | 98 |
| 90G | 96 |
| 100G | 101 |
| 110G | 98 |
Claims (10)
1, a kind of ultra-wide band filter, include low frequency LC filter and high frequency absorption formula filter, described high frequency absorption formula filter comprises metal shell and is located at the interior shielding cavity of housing, filling high-performance electromagnetic wave absorption medium in the shielding cavity is characterized in that described low frequency LC filter is embedded in the high-performance electromagnetic wave absorption medium of shielding cavity.
2, by the described ultra-wide band filter of claim 1, it is characterized in that described shielding cavity constitutes by installing metal partion (metp) in the metal shell.
3, by claim 1 or 2 described ultra-wide band filters, it is characterized in that described low frequency LC filter is combined by series inductance and shunt capacitance, the inductance of series connection is provided with 2～6, at each inductance two ends and connect shunt capacitance.
4, by the described ultra-wide band filter of claim 3, it is characterized in that by the number of inductance in the LC filter metal casing body metal partion (metp) correspondence being divided into a plurality of shielding cavities, an inductance is installed in the shielding cavity.
5, by the described ultra-wide band filter of claim 3, it is characterized in that described inductance is a common mode inductance, electric capacity is feedthrough capacitor.
6,, it is characterized in that high-performance electromagnetic wave absorption medium is formed by the evenly mixed system of high conductive carbon powder, polyaniline, metallic fiber and epoxy resin by claim 1 or 2 described ultra-wide band filters.
7, by the described ultra-wide band filter of claim 5, it is characterized in that described common mode inductance is made of the coil that is wound on the amorphous magnet ring.
8,, it is characterized in that described feedthrough capacitor installs the both sides in metal partion (metp) by the described ultra-wide band filter of claim 5.
9, by claim 4 or 5 described ultra-wide band filters, it is characterized in that inductance is provided with 3 L1, L2, L3, inductance is a common mode inductance, the side connects 8 capacitor C 1 between 3 inductance, C2, C3, C4, C5, C6, C7, C8, wherein C1 is connected in series mutually with C2 and the appearance value equates, C3 is connected in series mutually with C4 and the appearance value equates, C5 is connected in series mutually with C6 and the appearance value equates, C7 is connected in series mutually with C8 and the appearance value equates, 4 pairs of other respectively two ends that are connected to 3 inductance of electric capacity, the interlude ground connection of every pair of electric capacity, metal shell is a rectangular metal shell, longitudinally 5 shielding cavities are set in the housing by metal partion (metp), two ends be respectively input, the output shielding cavity, middle 3 is the inductor shield chamber, inductance L 1, L2, L3 is installed in respectively in middle 3 inductor shield chambeies, 8 electric capacity are feedthrough capacitor, install the both sides in metal partion (metp).
10, by claim 1 or 2 described ultra-wide band filters, it is characterized in that described high-performance electromagnetic wave absorption medium evenly mixes system curing by high conductive carbon powder, polyaniline, metallic fiber and epoxy resin and forms, its mixed proportion can be by weight: high conductive carbon powder: polyaniline: metallic fiber: epoxy resin=1: 1: 1: 10.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB2005100194741A CN100495813C (en) | 2005-09-22 | 2005-09-22 | Ultra width band wave filter |
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| CNB2005100194741A CN100495813C (en) | 2005-09-22 | 2005-09-22 | Ultra width band wave filter |
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| CN1794514A true CN1794514A (en) | 2006-06-28 |
| CN100495813C CN100495813C (en) | 2009-06-03 |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101630765B (en) * | 2009-08-25 | 2012-10-17 | 华为技术有限公司 | Coaxial low-pass filter and amplitude-frequency characteristic improving method |
| CN102969998A (en) * | 2012-11-22 | 2013-03-13 | 西安开容电子技术有限责任公司 | Multiple-telephone line filter |
| CN103269210A (en) * | 2013-06-16 | 2013-08-28 | 国家电网公司 | VFTO (Very Fast Transient Overvoltage) filter suitable for GIS (Gas Insulated Switchgear) body type digital collecting device |
| CN103337336A (en) * | 2012-06-15 | 2013-10-02 | 杭州祺来电子有限公司 | Broadband common mode inductor and isolating circuit comprising broadband common mode inductor |
| WO2015027563A1 (en) * | 2013-08-24 | 2015-03-05 | 中国北车集团大同电力机车有限责任公司 | Auxiliary filtering cabinet |
| CN106571209A (en) * | 2016-07-27 | 2017-04-19 | 宁夏银利电气股份有限公司 | High-frequency inductor with embedded radiator |
| CN108604889A (en) * | 2016-02-05 | 2018-09-28 | 阿莫泰克有限公司 | Differential mode and common mode dual-purpose filter |
| CN112786411A (en) * | 2020-12-30 | 2021-05-11 | 广东美的白色家电技术创新中心有限公司 | Magnetron filtering component, magnetron and household appliance |
| CN113098014A (en) * | 2021-04-20 | 2021-07-09 | 中国人民解放军军事科学院国防工程研究院工程防护研究所 | High-power broadband power filter |
-
2005
- 2005-09-22 CN CNB2005100194741A patent/CN100495813C/en active Active
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101630765B (en) * | 2009-08-25 | 2012-10-17 | 华为技术有限公司 | Coaxial low-pass filter and amplitude-frequency characteristic improving method |
| CN103337336A (en) * | 2012-06-15 | 2013-10-02 | 杭州祺来电子有限公司 | Broadband common mode inductor and isolating circuit comprising broadband common mode inductor |
| CN103337336B (en) * | 2012-06-15 | 2016-04-27 | 杭州祺来电子有限公司 | A kind of broadband common mode inductor and comprise the buffer circuit of broadband common mode inductor |
| CN102969998A (en) * | 2012-11-22 | 2013-03-13 | 西安开容电子技术有限责任公司 | Multiple-telephone line filter |
| CN103269210A (en) * | 2013-06-16 | 2013-08-28 | 国家电网公司 | VFTO (Very Fast Transient Overvoltage) filter suitable for GIS (Gas Insulated Switchgear) body type digital collecting device |
| CN103269210B (en) * | 2013-06-16 | 2015-09-02 | 国网吉林省电力有限公司电力科学研究院 | A kind of VFTO filter being applicable to GIS body type digital acquisition device |
| WO2015027563A1 (en) * | 2013-08-24 | 2015-03-05 | 中国北车集团大同电力机车有限责任公司 | Auxiliary filtering cabinet |
| CN108604889A (en) * | 2016-02-05 | 2018-09-28 | 阿莫泰克有限公司 | Differential mode and common mode dual-purpose filter |
| CN106571209A (en) * | 2016-07-27 | 2017-04-19 | 宁夏银利电气股份有限公司 | High-frequency inductor with embedded radiator |
| CN112786411A (en) * | 2020-12-30 | 2021-05-11 | 广东美的白色家电技术创新中心有限公司 | Magnetron filtering component, magnetron and household appliance |
| CN113098014A (en) * | 2021-04-20 | 2021-07-09 | 中国人民解放军军事科学院国防工程研究院工程防护研究所 | High-power broadband power filter |
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| Publication number | Publication date |
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| CN100495813C (en) | 2009-06-03 |
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| C14 | Grant of patent or utility model | ||
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| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Wuhan Ship Development & Design Institute Assignor: China Ship Research and Design Center Contract fulfillment period: 2009.9.1 to 2014.9.1 contract change Contract record no.: 2009420010071 Denomination of invention: Small wide-frequency filter restraining WLAN signal interference Granted publication date: 20090603 License type: Exclusive license Record date: 20091218 |
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Free format text: EXCLUSIVE LICENSE; TIME LIMIT OF IMPLEMENTING CONTACT: 2009.9.1 TO 2014.9.1; CHANGE OF CONTRACT Name of requester: WUHAN INSTITUTE OF SHIP DESIGN Effective date: 20091218 |