CN1259748C - Band-rejection microwave interference suppression filter of power cord - Google Patents
Band-rejection microwave interference suppression filter of power cord Download PDFInfo
- Publication number
- CN1259748C CN1259748C CN 200410014520 CN200410014520A CN1259748C CN 1259748 C CN1259748 C CN 1259748C CN 200410014520 CN200410014520 CN 200410014520 CN 200410014520 A CN200410014520 A CN 200410014520A CN 1259748 C CN1259748 C CN 1259748C
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- transmission line
- oscillator
- line oscillator
- filter
- transmission lines
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- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Abstract
The present invention relates to a band-rejection microwave interference suppression filter of a power cord, which is an interference suppression filter of a power cord with favorable performance of insertion loss in frequency range of 8GHz to 40GHz. The present invention is suitable for filtering the power cord in fields of electromagnetic compatibility and microwave. The filter is composed of conductors and oscillators of transmission lines. An inner conductor is used as the axle center of the filter, the external circumference in the middle part of the inner conductor forms a multistage step shape, and external diameters are increased in sequence. A first oscillator of the transmission lines, a second oscillator of the transmission lines, a third oscillator of the transmission lines, a fourth oscillator of the transmission line and a fifth oscillator of the transmission lines are sheathed on each step correspondingly. Insulated positioning sleeves are arranged on the external circumferences of the first oscillator and the second oscillator of the transmission lines, and insulated sleeves are arranged on the external circumferences of the third oscillator, the fourth oscillator and the fifth oscillator of the transmission lines. Outer conductors are arranged on the external circumferences of the insulated positioning sleeves and the insulated sleeves. A left filling and sealing cover and a right filling and sealing cover are arranged among both heads of the outer conductor and the inner conductor.
Description
Technical field
The present invention is a kind of power line interference suppression filter that has good insertion drain performance in 8GHz～40GHz frequency range, is applicable to the power line filtering of electromagnetic compatibility and microwave regime, the technical field of affiliated electromagnetic compatibility and microwave.
Background technology
In order to prevent that external interference from influencing the operate as normal of electronic system by power line, must take strict filtering measures to suppress extraneous electromagnetic interference.Traditional power supply interference suppression filter has following two kinds: the 1. LC filter that is formed by electric capacity and inductor combination is applicable to the frequency range that 1GHz is following.Influenced by the distributed constant of lumped elements electric capacity and inductance, the insertion drain performance of LC filter obviously descends when frequency surpasses 1GHz.2. utilize the loss line filter of lossy medium decay interference signal, suitable frequency range is 1GHz～10GHz.When interfering frequency surpasses 10GHz, more than the filter of two kinds of versions all powerless.
Along with the fast development of electronics and information technology, the frequency of electromagnetic interference signal is also more and more higher, and has a large amount of emc issues relevant with power line.Therefore in electromagnetic compatibility and microwave regime, it is that a urgent need puts the axe in the helve that the power line in 10GHz～40GHz frequency range disturbs.
Summary of the invention
Technical problem: the power line that the purpose of this invention is to provide a kind of frequency coverage 8GHz～40GHz hinders the wave interference rejects trap that declines with band, and the power line that can effectively solve in 10GHz～40GHz frequency range disturbs an inhibition difficult problem.
Technical scheme: for the power line that solves in 10GHz ~ 40GHz frequency range disturbs, the utility model is developed the band resistance formula filter based on λ/4 (" 1/4 wavelength ") short circuit and open circuited transmission line principle.This filter is the coaxial line structure, shows in the test result under the 50 Ω systems: the insertion loss of filter in 8GHz～40GHz frequency range is better than 40dB.In addition, the utility model current carrying capacity can reach 50A, and volume is little in light weight, and it is reliable and stable, easy to install to insert drain performance.
The technical solution adopted in the present invention is: utilize λ/4 open-circuit lines and λ/4 short-circuit lines to design band resistance formula power supply interference suppression filter, its basic thought is at the fixing every interval λ of a pair of transmission line
j/ 4 (λ connects for j=1,3...n-1) distance
i/ 4 (i=2,4...n) the short circuit oscillator is similar to λ
i/ 4 short-circuit lines and λ
i/ 4 open-circuit lines polyphone to cause wave reflection, makes the interference signal in this frequency range be subjected to intercepting and can not pass through.
Size by the choose reasonable transmission line, the covering band limits of each transmission line oscillator of optimum division, make the band limits of a broad of covering of each transmission line oscillator, 5 the transmission line oscillators of having contacted have in the conductor promptly covered the frequency range of 8GHz～40GHz.
Structurally this filter is the axle center with the inner wire, the excircle at inner wire middle part is multistage stepped, external diameter increases successively, correspondence is with the first transmission line oscillator on the step of each grade, the second transmission line oscillator, the 3rd transmission line oscillator, the 4th transmission line oscillator, the 5th transmission line oscillator, at the first transmission line oscillator, the excircle of the second transmission line oscillator is provided with the insulation abutment sleeve, at the 3rd transmission line oscillator, the 4th transmission line oscillator, the excircle of the 5th transmission line oscillator is provided with insulating sleeve, at the insulation abutment sleeve, the excircle of insulating sleeve is provided with outer conductor, is provided with left embedding lid between the two of outer conductor and inner wire, right embedding lid.
The structure of the first transmission line oscillator, the second transmission line oscillator is the pipe shape, is provided with the one-level circle ladder that inwardly dwindles in the central authorities of round tube inner wall; The structure of the 3rd transmission line oscillator, the 4th transmission line oscillator, the 5th transmission line oscillator is the pipe shape, is provided with the two-stage circle ladder that inwardly dwindles in the central authorities of round tube inner wall.
Beneficial effect:
1, this filter has good insertion drain performance in 8GHz～40GHz frequency range, satisfies the power line filtering requirements of association area;
2, filter is based on the operation principle of microwave transmission line, and its filter effect is only relevant with the physical dimension of oscillator, compares with conventional filter, and it is simple in structure, and is stable and reliable for performance and be not subjected to the influence of working temperature and operating current;
3, filter is made of λ/4 short circuits and open circuited transmission line section, does not adopt filter elements such as electric capacity and inductance.Compare its current carrying capacity height with conventional filter;
4, by to this filter construction optimized dimensions, make each transmission line oscillator cover the band limits of a broad, 5 the transmission line oscillators of contacting have in the conductor promptly covered the frequency range of 8GHz～40GHz.This filter construction compactness, volume is little in light weight;
Description of drawings
The present invention is further described below in conjunction with drawings and Examples.
Fig. 1 is a general structure schematic diagram of the present invention.Inner wire 1, left embedding lid 2, outer conductor 3, transmission line oscillator 4,5,7,9,10, insulation abutment sleeve 6, insulating sleeve 8, right embedding lid 11 are arranged among the figure.
Fig. 2 is the structural representation of the first transmission line oscillator 4, the second transmission line oscillator 5.One-level circle ladder 41 is arranged among the figure.
Fig. 3 is the structural representation of the 3rd transmission line oscillator 7, the 4th transmission line oscillator 9, the 5th transmission line oscillator 10.Two-stage circle ladder 71 is arranged among the figure.
Embodiment
Power supply tape of the present invention hinders the wave interference rejects trap that declines, formed by internal and external conductor and transmission line oscillator, this filter is the axle center with inner wire 1, the excircle at inner wire 1 middle part is multistage stepped, external diameter increases successively, correspondence is with the first transmission line oscillator 4 on the step of each grade, the second transmission line oscillator 5, the 3rd transmission line oscillator 7, the 4th transmission line oscillator 9, the 5th transmission line oscillator 10, at the first transmission line oscillator 4, the excircle of the second transmission line oscillator 5 is provided with insulation abutment sleeve 6, at the 3rd transmission line oscillator 7, the 4th transmission line oscillator 9, the excircle of the 5th transmission line oscillator 10 is provided with insulating sleeve 8, at insulation abutment sleeve 6, the excircle of insulating sleeve 8 is provided with outer conductor 3, is provided with left embedding lid 2 between the two of outer conductor 3 and inner wire 1, right embedding lid 11.The structure of the first transmission line oscillator 4, the second transmission line oscillator 5 is the pipe shape, and the central authorities of an ancient piece of jade, round, flat and with a hole in its centre are provided with the one-level circle ladder 41 that inwardly dwindles in pipe; The structure of the 3rd transmission line oscillator 7, the 4th transmission line oscillator 9, the 5th transmission line oscillator 10 is the pipe shape, and the central authorities of an ancient piece of jade, round, flat and with a hole in its centre are provided with the two-stage circle ladder 71 that inwardly dwindles in pipe.
5 oscillators are realized axial location by the step on the inner wire 1, connect by soldering between oscillator and the inner wire, inner wire 1 is realized axial location by insulation abutment sleeve 6 and transmission line short circuit oscillator 7, insulation abutment sleeve 6 and insulating sleeve 8 are used for the insulation of oscillator and outer conductor 3, the embedding lid at filter two ends is used for the radial location of inner conductor of filter and the insulation between the internal and external conductor, external screw thread on the outer conductor 3 is used for installing and fixing of filter, and the external screw thread at inner wire 1 two ends is used for the connection of power supply turnover line.
The present invention is that a kind of power line hinders the wave interference rejects trap that declines with band, operation principle based on λ/4 short circuits and open circuited transmission line, oscillator of connecting on the inner wire and inner wire constitute λ/4 short-circuit lines, the short circuit oscillator is divided into some joints with inner wire and outer conductor, each joint constitutes one section λ/4 open-circuit line, λ/4 short-circuit lines and λ/4 open-circuit lines polyphone to cause wave reflection, makes the interior interference signal of a certain frequency range be subjected to intercepting and can not pass through.By 5 the transmission line oscillators of connecting, each joint transmission line covers a frequency range, guarantees that the covering frequency range of filter reaches 8GHz～40GHz.
This filter has good insertion loss characteristic in 8GHz～40GHz frequency range, can satisfy the power line filtering demand of association area, and this is that conventional LC filter is incompetent.This filter construction compactness, stable and reliable for performance, and have higher current carrying capacity.
Claims (2)
1, a kind of power supply tape hinders the wave interference rejects trap that declines, formed by conductor and transmission line oscillator, it is characterized in that this filter is the axle center with inner wire (1), the excircle at inner wire (1) middle part is multistage stepped, external diameter increases successively, correspondence is with the first transmission line oscillator (4) on the step of each grade, the second transmission line oscillator (5), the 3rd transmission line oscillator (7), the 4th transmission line oscillator (9), the 5th transmission line oscillator (10), at the first transmission line oscillator (4), the excircle of the second transmission line oscillator (5) is provided with insulation abutment sleeve (6), at the 3rd transmission line oscillator (7), the 4th transmission line oscillator (9), the excircle of the 5th transmission line oscillator (10) is provided with insulating sleeve (8), at insulation abutment sleeve (6), the excircle of insulating sleeve (8) is provided with outer conductor (3), is provided with left embedding lid (2) between the two of outer conductor (3) and inner wire (1), right embedding lid (11).
2, power supply tape according to claim 1 hinders the wave interference rejects trap that declines, the structure that it is characterized in that the first transmission line oscillator (4), the second transmission line oscillator (5) is the pipe shape, and the central authorities of an ancient piece of jade, round, flat and with a hole in its centre are provided with the one-level circle ladder (41) that inwardly dwindles in pipe; The structure of the 3rd transmission line oscillator (7), the 4th transmission line oscillator (9), the 5th transmission line oscillator (10) is the pipe shape, and the central authorities of an ancient piece of jade, round, flat and with a hole in its centre are provided with the two-stage circle ladder (71) that inwardly dwindles in pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410014520 CN1259748C (en) | 2004-04-02 | 2004-04-02 | Band-rejection microwave interference suppression filter of power cord |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410014520 CN1259748C (en) | 2004-04-02 | 2004-04-02 | Band-rejection microwave interference suppression filter of power cord |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1564373A CN1564373A (en) | 2005-01-12 |
| CN1259748C true CN1259748C (en) | 2006-06-14 |
Family
ID=34478414
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200410014520 Expired - Fee Related CN1259748C (en) | 2004-04-02 | 2004-04-02 | Band-rejection microwave interference suppression filter of power cord |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1259748C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101950640B (en) * | 2010-08-25 | 2012-05-23 | 武汉凡谷电子技术股份有限公司 | Insulating sleeve bulging tool |
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2004
- 2004-04-02 CN CN 200410014520 patent/CN1259748C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1564373A (en) | 2005-01-12 |
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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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20060614 Termination date: 20180402 |