CN101567478B - Quarter-wave line terminal open circuit radio frequency lightning protection device for compensation - Google Patents
Quarter-wave line terminal open circuit radio frequency lightning protection device for compensation Download PDFInfo
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- CN101567478B CN101567478B CN 200910107730 CN200910107730A CN101567478B CN 101567478 B CN101567478 B CN 101567478B CN 200910107730 CN200910107730 CN 200910107730 CN 200910107730 A CN200910107730 A CN 200910107730A CN 101567478 B CN101567478 B CN 101567478B
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Abstract
The invention provides a quarter-wave line terminal open circuit radio frequency lightning protection device for compensation, which solves the lightning protection technical problem in multiband and boradband radio frequency microwave system, and problems of power feed protection and low intermodulation value or the like. The invention includes a external conductor, in which an input end 50 ohm coaxial line, an input end insulator, an input end compensation coaxial line, a quarter-wave branch line, an output end compensation coaxial line, an output end insulator, and an output end 50 ohm coaxial line; a clearance or a gaseous discharge lamp is equipped between the end of the quarter-wave branch line and the external conductor. The invention can provide power feed protection and guarantee high intermodulation value.
Description
Technical field
The invention belongs to the lightning protection device field, be specifically related to a kind of quatrter-wavelength line radio frequency lightning protection device.
Background technology
Radio frequency lightning protection device is the overvoltage crowbar for radio frequency microwave system (such as communication system), can make in the system valuable equipment to voltage-sensitive, exempts from the infringement of thunderbolt or surge such as low noise amplifier, frequency mixer and receiver etc.Simultaneously can provide protection for the power supply of system.
The frequency microwave antenna-feedback system is outdoor geographical position higher position because need of work is installed in more, be easy to be struck by lightning or the induction lightening surge voltage, as long as these transient overvoltages, overcurrent enter system, receiving equipment can be burnt immediately, causes equipment even personal casualty loss.Along with the modern communication career development; people more and more pay attention to the protection of communication equipment; International Telecommunications Union and China have formulated corresponding standard successively; require telecommunication apparatus must be designed with the measure that anti-lightning strike, surge, power induction and power line touch, only have and passed through relevant criterion and could use by network access.
The quatrter-wavelength line radio frequency lightning protection device is a kind of traditional lightning protection device.For many years, it bears the power height with simple in structure, and lightning protection effect is good, dependable performance, and non-maintaining characteristics extensively are used in a large number various radio-frequency receiving-transmittings and penetrate system.In recent years, along with developing rapidly of communication science and technology and market, radio system has not been some frequency or narrowband systems in the past, generation be multiband and broadband system, the high power feed system.Like this, the weakness of traditional quatrter-wavelength line radio frequency lightning protection device just shows especially out.Because the present transmitting-receiving conllinear of communication system, cause up and downstream signal between can produce intermodulation product.Conventional filter construction lightning protection device is difficult to accomplish low intermodulation value.Most-(43dBm*2) below the 150dBc, the product price that reaches this value is very high, and the product percent of pass is only less than 80%, along with the rising of communication frequency, the more difficult raising of intermodulation value.
Present existing product technology is can't feed, causes the antenna-feedback system with low noise amplifier to use.But and use other structure feed-type lightning protection device can not satisfy the requirement of the low intermodulation of system.
Summary of the invention
The objective of the invention is in order to solve the shocking preventing technology problem in multiband and the broadband radio frequency microwave system, and the problems such as feed protection, low intermodulation value, a kind of quarter-wave line terminal open circuit radio frequency lightning protection device for compensation is provided.
The object of the present invention is achieved like this: the present invention includes outer conductor, in described outer conductor, be provided with 50 ohm of coaxial lines of input, the input insulator, input compensating coaxial line, the quarter-wave branch line, the reference-junction compensation coaxial line, 50 ohm of coaxial lines of output insulator and output, 50 ohm of coaxial lines of described input link to each other through the support of input insulator and with input compensating coaxial line, the other end of input compensating coaxial line is connected with the reference-junction compensation coaxial line with the quarter-wave branch line respectively, 50 ohm of coaxial lines of the other end of reference-junction compensation coaxial line and output link to each other, 50 ohm of coaxial lines of output support through the output insulator, are provided with gap or gas discharge tube between the other end of described quarter-wave branch line and the outer conductor.
The compensating coaxial line of input described in the present invention and reference-junction compensation coaxial line can adopt two joints or more piece transmission line section to compose in series.With the raising of complex structure degree, exchange bandwidth of operation for and further widen, simultaneously can feeding DC.
The present invention can be provided with structure interval electric capacity at described reference-junction compensation coaxial line.Level of protection can be reduced, but feed can not be led to.
The present invention can be provided with at the end of described quarter-wave branch line the direct current output interface, thereby can lead to feed when described output is repaid coaxial line and is provided with structure interval electric capacity.
Technique effect of the present invention is: the present invention can provide on the basis of feed protection, guarantees high intermodulation value, reaches-160dBc, and percent of pass can reach more than 98%.Conventional quatrter-wavelength line radio frequency lightning protection device but can't be the power consumption equipment feed on top, base station, and this product has also increased the function that can lead to feed except the characteristics that contain conventional quatrter-wavelength line radio frequency lightning protection device.Can reduce the system wiring cost with protection radio-frequency apparatus and power supply unit, improve device sensitivity.The advantage of present two class lightning protection devices has been merged in the present invention, but has broadband low-intermodulation and feed-type lightning protection device now, both can not satisfy simultaneously the demand of antenna-feedback system.And the present invention has satisfied the lightning protection demand of antenna-feedback system needs feed and low intermodulation with high cost performance, both are indispensable, if can not feed, low noise amplifier can not be worked, then receiving system can not be received signal, if the intermodulation value is too poor, can produce inter-modulated signal because transmitting power is excessive and fall into receiving belt, thus the EVAC (Evacuation Network Computer Model) normal operation.
Description of drawings
Fig. 1 is the structural representation of embodiment one.
Fig. 2 is the circuit theory diagrams of embodiment one.
Fig. 3 is the structural representation of embodiment two.
The circuit theory diagrams of Fig. 4 embodiment two.
The structural representation of Fig. 5 embodiment three.
Fig. 6 executes the circuit theory diagrams of example three.
Fig. 7 is the practical function figure of embodiment one to embodiment three.
Embodiment
Referring to Fig. 2, the circuit of present embodiment is reciprocity, for convenient narration, has artificially increased direction.Circuit types shown in Figure 2 is the coaxial line circuit.Referring to Fig. 1, the lightning protection device of embodiment one comprises outer conductor 2, in outer conductor 2, be provided with 50 ohm of coaxial lines 1 of input, input insulator 3, input compensating coaxial line 4, quarter-wave branch line 8, reference-junction compensation coaxial line 5,50 ohm of coaxial lines 7 of output insulator 6 and output, 50 ohm of coaxial lines 1 of input link to each other through 3 supports of input insulator and with input compensating coaxial line 4, the other end of input compensating coaxial line 4 is connected with the reference-junction compensation coaxial line with quarter-wave branch line 8 respectively and is connected, 50 ohm of coaxial lines 7 of the other end of reference-junction compensation coaxial line 5 and output link to each other, 50 ohm of coaxial lines 7 of output support through output insulator 6, the other end of quarter-wave branch line 8 links to each other with gap 9, gap 9 joins with outer conductor 2 again, and gap 9 also can be substituted by gas discharge tube.
Referring to Fig. 2, operation principle of the present invention is as follows: the present invention increases outside the gap (or gas discharge tube) except utilizing the compensating coaxial line segment that adds to expand the working band of circuit, and other characteristic and traditional quatrter-wavelength line lightning protection device are identical.Reasonable design calculates two compensator sections and quarter-wave branch line, can obtain surpassing the above bandwidth of operation of an octave (relative bandwidth 66.6%).Fig. 7 is exactly the characteristic of Fig. 1, Fig. 3 and circuit embodiment illustrated in fig. 5, and circuit is used for 0.8 ~ 2.5GHz multi-frequency radio network system, and the relative bandwidth of its VSWR=1.2 reaches 103%, much larger than an octave.
Referring to Fig. 3; embodiment two implements the DC-isolation structure; the difference of it and embodiment one is: the lightning protection device of embodiment two changes input compensating coaxial line 402 and reference-junction compensation coaxial line 502 by two joint transmission line section into forms; and be provided with the capacity plate antenna 10 of structural formula at reference-junction compensation coaxial line 502; isolate feed with structure; utmost point under-voltage protection level can be provided again in the identical product of function, reach the effect that reduces protection voltage, thereby improve the degree of reliability of system.The capacity plate antenna 10 of structural formula also can adopt other structure interval electric capacity such as dielectric capacitance of structural formula to substitute.Input compensating coaxial line and reference-junction compensation coaxial line are on quarter-wave branch line punishment circle among the present invention, the quarter-wave branch line is connected with an end of input compensating coaxial line, is the reference-junction compensation coaxial line at the opposite side of quarter-wave branch line.
Referring to Fig. 5, embodiment three implements the direct current isolating construction, it is provided with direct current output interface 11 at the end of quarter-wave branch line 803 on the basis of the lightning protection device of embodiment two, thereby the feed path is changed to direct current output interface 11 outputs by quarter-wave branch line 803 ends.The voltage that can satisfy like this system separates with radiofrequency signal.
Claims (2)
1. quarter-wave line terminal open circuit radio frequency lightning protection device for compensation, comprise outer conductor, in described outer conductor, be provided with 50 ohm of coaxial lines of input, the input insulator, input compensating coaxial line, the quarter-wave branch line, the reference-junction compensation coaxial line, 50 ohm of coaxial lines of output insulator and output, 50 ohm of coaxial lines of described input link to each other through the support of input insulator and with input compensating coaxial line, the other end of input compensating coaxial line is connected with the reference-junction compensation coaxial line with the quarter-wave branch line respectively, 50 ohm of coaxial lines of the other end of reference-junction compensation coaxial line and output link to each other, 50 ohm of coaxial lines of output support through the output insulator, it is characterized in that: be provided with gap or gas discharge tube between the other end of described quarter-wave branch line and the outer conductor; Be provided with structure interval electric capacity at described reference-junction compensation coaxial line; End at described quarter-wave branch line also is provided with the direct current output interface.
2. quarter-wave line terminal open circuit radio frequency lightning protection device for compensation according to claim 1 is characterized in that: described input compensating coaxial line and reference-junction compensation coaxial line adopt the more piece transmission line section to compose in series.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910107730 CN101567478B (en) | 2009-05-27 | 2009-05-27 | Quarter-wave line terminal open circuit radio frequency lightning protection device for compensation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910107730 CN101567478B (en) | 2009-05-27 | 2009-05-27 | Quarter-wave line terminal open circuit radio frequency lightning protection device for compensation |
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| Publication Number | Publication Date |
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| CN101567478A CN101567478A (en) | 2009-10-28 |
| CN101567478B true CN101567478B (en) | 2013-03-20 |
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| CN 200910107730 Active CN101567478B (en) | 2009-05-27 | 2009-05-27 | Quarter-wave line terminal open circuit radio frequency lightning protection device for compensation |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102738617B (en) * | 2011-04-13 | 2014-01-08 | 江苏荣联科技发展股份有限公司 | Direct current feeding type lightning protection cable assembly |
| CN102354967B (en) * | 2011-09-28 | 2014-08-06 | 株洲普天中普防雷科技有限公司 | Circular helical-line radio-frequency lightning protection method and lightning protection device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10308211A1 (en) * | 2003-02-25 | 2004-09-09 | Shf Communication Technologies Ag | DC block coaxial cable unit for microwave transmission has passive bridge component in bores in end faces of small gap in inner conductor |
| CN201063440Y (en) * | 2007-07-10 | 2008-05-21 | 深圳市麦克海鹏信电子有限公司 | Broadband compensation quarter-wave line RF lightning arrester |
| CN201378679Y (en) * | 2009-03-25 | 2010-01-06 | 深圳市海鹏信电子股份有限公司 | Compensating quarter-wave line tail-end open-circuit radio-frequency lightning arrester |
-
2009
- 2009-05-27 CN CN 200910107730 patent/CN101567478B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10308211A1 (en) * | 2003-02-25 | 2004-09-09 | Shf Communication Technologies Ag | DC block coaxial cable unit for microwave transmission has passive bridge component in bores in end faces of small gap in inner conductor |
| CN201063440Y (en) * | 2007-07-10 | 2008-05-21 | 深圳市麦克海鹏信电子有限公司 | Broadband compensation quarter-wave line RF lightning arrester |
| CN201378679Y (en) * | 2009-03-25 | 2010-01-06 | 深圳市海鹏信电子股份有限公司 | Compensating quarter-wave line tail-end open-circuit radio-frequency lightning arrester |
Non-Patent Citations (1)
| Title |
|---|
| JP特开2002-25745A 2002.01.25 |
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