CN102914701B - Anti-interference measuring device for environmental electromagnetic radiation of mobile communication base station - Google Patents
Anti-interference measuring device for environmental electromagnetic radiation of mobile communication base station Download PDFInfo
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- CN102914701B CN102914701B CN201210380875.XA CN201210380875A CN102914701B CN 102914701 B CN102914701 B CN 102914701B CN 201210380875 A CN201210380875 A CN 201210380875A CN 102914701 B CN102914701 B CN 102914701B
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Abstract
An anti-interference measuring device for environmental electromagnetic radiation of a mobile communication base station comprises a square or cuboid shield body, wherein a square opening is formed in one side surface of the square or cuboid shield body; other five surfaces of the square or cuboid shield body are metal shielding surfaces; and wave-absorbing materials are paved on the surface of the whole inner cavity of the shield body. The width and the height of a net cavity of the shield body are two times of the longest wavelength of a downlink signal of the mobile communication; and the length of the net cavity is two times greater than or equal to the longest wavelength of the downlink signal of the mobile communication. The wave-absorbing materials comprise two kinds, wherein one kind of the wave-absorbing materials is paved at the center at the inner sides of the shielding surfaces and the wave-absorbing performance of the wave-absorbing material for a 1GHz frequency signal can reach or exceed -25dB; and the other kind of the wave-absorbing materials is paved on remaining gaps at the periphery of the inner sides of the shielding surfaces and the wave-absorbing performance of the wave-absorbing material for the 1GHz frequency signal can reach or exceed -12dB. The anti-interference measuring device further comprises a radio-frequency integrated field intensity indicator arranged on the wave-absorbing material on the bottom surface of an inner cavity of the shield body; and a measuring signal of the radio-frequency integrated field intensity indicator is output by optical fibers and is connected with a portable computer through a photoelectric conversion head. The anti-interference measuring device disclosed by the invention can be used for carrying out accurate anti-interference measurement on the environmental electromagnetic radiation level of the mobile communication base station.
Description
Technical field
The invention belongs to electromagnetic radiation from environment measurement, electromagnetic compatibility, electromangnetic spectrum field, be specifically related to a kind of device that can carry out anti-interference accurate measurement to the electromagnetic radiation from environment level of mobile communication base station.
Background technology
Electromagnetic radiation pollution has become the fourth-largest pollution after air, water and noise pollution.Mobile communication base station is the major electromagnetic radiation source in city, can reach every 0.09km in urban population compact district
2just there is 1 base station, the public is concerned about the electromagnetic radiation that antenna for base station produces very much, correspondingly environmental monitoring department has also carried out a large amount of networks, and main monitoring means is rf integration field intensity meter and spectrum analyzer, and these two kinds of instruments respectively have pluses and minuses in environmental monitoring.
The major advantage of rf integration field intensity meter: be swift in response, does not carry out with frequency sweep form, can the electromagnetic radiation level of all signals in measuring probe frequency range; Shortcoming: can not carry out frequency-division section measurement, when measuring special object (in certain frequency range), in the signal of other frequency range is also included within environment, causes measurement result bigger than normal.The major advantage of spectrum analyzer: can carry out Measurement accuracy to a certain frequency, not by the interference of non-measured frequency; Shortcoming: measure and carry out with the form of frequency sweep, for the object of this (μ s level) conversion frequency fast of mobile communication, is difficult to survey accurate survey entirely, is difficult to provide the total electromagnetic radiation level of a certain frequency range.
Based on above analysis, from ambient influnence overall control angle, rf integration field intensity meter is more suitable for for electromagnetic environment monitor, in order to overcome its inherent defect and realize frequency spectrograph certain advantages, the anti-interference measurement mechanism of a kind of mobile communication base station electromagnetic radiation from environment need be invented, this device can shield and absorb interfering signal, only allows the measuring-signal expected enter test environment, thus reaches the object of Measurement accuracy.
Summary of the invention
Object of the present invention is just to provide the anti-interference measurement mechanism of a kind of mobile communication base station electromagnetic radiation from environment, accurately can measure the electromagnetic radiation from environment level of mobile communication base station.
For achieving the above object, the anti-interference measurement mechanism of mobile communication base station of the present invention electromagnetic radiation from environment, comprise the shield of square or cuboid, one side of this shield is square openings, all the other five for having the metal screen lee-side of excellent conductive performance, the whole surface of internal cavity of this shield lays absorbing material.
The width in described shield headroom chamber is 2 times of the most long wavelength of mobile communication downlink signal, is highly 2 times of the most long wavelength of mobile communication downlink signal, and length is 2 times that are more than or equal to the most long wavelength of mobile communication downlink signal.
Described absorbing material the best is divided into two kinds, be lay ground plane inner central, absorbing property a meets or exceeds-25dB absorbing material to 1GHz frequency signal, another kind be lay surrounding residue space inside ground plane, absorbing property meets or exceeds-12dB absorbing material to 1GHz frequency signal.Special case is: the absorbing material of described laying ground plane inner central is hollow rubber pyramid absorbing material, and the absorbing material laying surrounding residue space inside ground plane is rubber flat plate absorbing material.
Also comprise the rf integration field intensity meter be located on the absorbing material of shield inner chamber bottom surface.The square openings of described shield is front, and the clear distance inside the probe of described rf integration field intensity meter and left surface, right flank, end face, bottom surface is more than or equal to 1 measured band wavelength, is 10cm with the clear distance inside the back side.The measurement data signals of described rf integration field intensity meter exports through optical fiber, and this fiber-optic output connects portable computer through opto-electronic conversion head.
Described metal screen lee-side is copper coin, aluminium sheet or corrosion resistant plate etc.
Described shield shell connects drop bar by ground wire.
The present invention utilizes metal pair electromagnetic wave to have shielding action and absorbing material has stronger absorption to incident electromagnetic wave, realizing accurately measuring mobile communication base station electromagnetic radiation from environment level by rf integration field intensity meter, is a kind of desirable anti-interference measurement mechanism of mobile communication base station electromagnetic radiation from environment.
Accompanying drawing explanation
Fig. 1 is the structural representation of embodiment;
Fig. 2 be embodiment ground plane inside lay the schematic diagram of absorbing material.
In figure: 1. aluminium sheet 2. aluminium sheet 3. aluminium sheet 4. aluminium sheet 5. aluminium sheet 6. interface of the ground wire 7. angle bar frame 8. ground wire 9. drop bar 10. rf integration field intensity meter is popped one's head in 11. rf integration field intensity meter 12. signal output optical fibre 13. plastics three-legged support 14. opto-electronic conversion, 15. portable computer 16. hollow rubber pyramid absorbing material 17. rubber flat plate absorbing material 18. square openings.
Detailed description of the invention
Below in conjunction with accompanying drawing, preferred embodiment is described in detail.
As shown in Figure 1, utilize solid rivet respectively by aluminium sheet 1, aluminium sheet 2, aluminium sheet 3, aluminium sheet 4, aluminium sheet 5 impermeable riveting on the angle bar frame 7 through welding, form the square that has five aluminium sheets.This square is shield, and five aluminium sheets form five metal screen lee-sides, and the one side without aluminium sheet forms square openings 18.The pattern pressing Fig. 2 respectively inside aluminium sheet 1, aluminium sheet 2, aluminium sheet 3, aluminium sheet 4, aluminium sheet 5 pastes hollow rubber pyramid absorbing material 16, rubber flat plate absorbing material 17.Rf integration field intensity meter 11 with plastics three-legged support 13 to be placed on inside bottom surface aluminium sheet 2 on hollow rubber pyramid absorbing material 16 by diagonal, the square openings 18 of shield is front, the probe 10 of rf integration field intensity meter 11 is more than or equal to 1 measured band wavelength with the clear distance inside left surface aluminium sheet 3, right flank aluminium sheet 1, end face aluminium sheet 4, bottom surface aluminium sheet 2, be 10cm with the clear distance inside back side aluminium sheet 5, clear distance refers to the distance inside probe 10 and aluminium sheet between absorbing material.The measurement data signals of rf integration field intensity meter 11 spreads out of through optical fiber 12, and is received by portable computer 15 after opto-electronic conversion 14 conversion, and optical fiber 12 is drawn by the square openings 18 of shield.
At present, domestic mobile communication comprises 2G, 3G, 4G network, and the most long wavelength of mobile communication downlink signal is 2G(GSM) net is 33cm.
Embodiment is by five pieces of 76cm*76cm*1cm(length and widths, thick) aluminium sheet become the square shield of 76cm*76cm*76cm with atresia rivet by angle steel, this shield be square openings 18 without aluminium sheet face, all the other five is aluminium sheet ground plane, paste 64cm*64cm*5cm(length at the inner central of each aluminium sheet) hollow rubber pyramid absorbing material 16, inside aluminium sheet surrounding (remainder) to paste 6cm*0.5cm(wide, thick) rubber flat plate absorbing material 17 to be to fill up whole shield surface of internal cavity.
The wave-absorbing effect of hollow rubber pyramid absorbing material 16 and rubber flat plate absorbing material 17 pairs of 1GHz frequency signals is-25dB and-12dB respectively.
The shield of embodiment is square, length, the width in its headroom chamber, is highly:
Height=76cm-2 × the 5cm=66cm of width-2 × hollow rubber pyramid absorbing material of aluminium sheet,
For 2 times of the most long wavelength 33cm of mobile communication downlink signal.
The headroom chamber of shield refer to the surface of internal cavity of shield lay absorbing material after cavity.
The present invention, before measurement starts, is needed the interface of the ground wire 7 of shield shell to be communicated with drop bar 9 by ground wire 8, and drop bar 9 is squeezed into ground 50cm.
When carrying out mobile communication base station electromagnetic radiation from environment in-site measurement, the present invention is placed in overhead that 1.7m is high, during condition license, also the present invention can be elevated to and the position of intending measuring the contour or certain height difference of antenna of mobile communication base station, adjust the Ang Jiao that bows of the present invention, make square openings 18 and plan measure antenna of mobile communication base station transmit direction vertical.At this moment the direct signal that the present invention only allows antenna of mobile communication base station launch arrives the probe 10 of rf integration field intensity meter 11, intends the reflection of measurement mobile communication base station, diffraction, scattered signal and other electromagnetic radiation source signal and all can be shielded by shield of the present invention or absorb.
Claims (8)
1. the anti-interference measurement mechanism of mobile communication base station electromagnetic radiation from environment, it is characterized in that: the shield and the rf integration field intensity meter that comprise square or cuboid, the front of this shield is square openings, all the other five for having the metal screen lee-side of excellent conductive performance, the whole surface of internal cavity of this shield lays absorbing material, described rf integration field intensity meter is located on the absorbing material of shield inner chamber bottom surface, the width in described shield headroom chamber is 2 times of the most long wavelength of mobile communication downlink signal, it is highly 2 times of the most long wavelength of mobile communication downlink signal, length is 2 times that are more than or equal to the most long wavelength of mobile communication downlink signal, the probe of described rf integration field intensity meter and left surface, right flank, end face, clear distance inside bottom surface is more than or equal to 1 measured band wavelength.
2. anti-interference measurement mechanism according to claim 1, it is characterized in that: described absorbing material is divided into two kinds, be lay ground plane inner central, absorbing property a meets or exceeds-25dB absorbing material to 1GHz frequency signal, another kind be lay surrounding residue space inside ground plane, absorbing property meets or exceeds-12dB absorbing material to 1GHz frequency signal.
3. anti-interference measurement mechanism according to claim 2, is characterized in that: the absorbing material of described laying ground plane inner central is hollow rubber pyramid absorbing material, and the absorbing material laying surrounding residue space inside ground plane is rubber flat plate absorbing material.
4. anti-interference measurement mechanism according to claim 1, is characterized in that: the probe of described rf integration field intensity meter with the back side inside clear distance be 10cm.
5. anti-interference measurement mechanism according to claim 1, is characterized in that: the measurement data signals of described rf integration field intensity meter exports through optical fiber.
6. anti-interference measurement mechanism according to claim 5, is characterized in that: described fiber-optic output connects portable computer through opto-electronic conversion head.
7. anti-interference measurement mechanism according to claim 1, is characterized in that: described metal screen lee-side is copper coin, aluminium sheet or corrosion resistant plate.
8. anti-interference measurement mechanism according to claim 1, is characterized in that: described shield shell connects drop bar by ground wire.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210380875.XA CN102914701B (en) | 2012-10-10 | 2012-10-10 | Anti-interference measuring device for environmental electromagnetic radiation of mobile communication base station |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210380875.XA CN102914701B (en) | 2012-10-10 | 2012-10-10 | Anti-interference measuring device for environmental electromagnetic radiation of mobile communication base station |
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| CN102914701A CN102914701A (en) | 2013-02-06 |
| CN102914701B true CN102914701B (en) | 2015-03-25 |
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| CN112298525B (en) * | 2020-09-29 | 2021-11-02 | 中国电子科技集团公司第七研究所 | Platform load electromagnetic compatibility method based on solar unmanned aerial vehicle and solar unmanned aerial vehicle |
| CN113156223B (en) * | 2021-05-21 | 2022-11-22 | 张金帆 | Method and device for detecting electromagnetic radiation pollution of electromagnetic radiation source |
| CN117081698B (en) * | 2023-07-05 | 2024-03-29 | 盐城工学院 | Intelligent automobile external interference processing method |
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| JP2001074797A (en) * | 1999-09-01 | 2001-03-23 | Fuji Elelctrochem Co Ltd | Portable radio wave measuring instrument |
| JP4440002B2 (en) * | 2004-06-03 | 2010-03-24 | 株式会社図研 | Anechoic chamber |
| CN101207881A (en) * | 2006-12-19 | 2008-06-25 | 中兴通讯股份有限公司 | Apparatus and method for testing mobile terminal near field radiation |
| CN101750549B (en) * | 2008-12-15 | 2012-06-27 | 北方设计研究院 | Electromagnetic measurement comprehensive darkroom for electromagnetic compatibility test and antenna measurement |
| CN202837411U (en) * | 2012-10-10 | 2013-03-27 | 广东省辐射防护协会 | Environment electromagnetic radiation anti-interference measurement device for movable communication station |
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Owner name: GUANGDONG ENVIRONMENT RADIATION MONITORING CENTER Free format text: FORMER OWNER: GUANGDONG ENVIRONMENT RADIATION MONITORING CENTER Effective date: 20130608 |
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Effective date of registration: 20130608 Address after: 510300 No. 860, Guangzhou Avenue, Haizhuqu District, Guangdong, Guangzhou Applicant after: Radiation Protection Association of Guangdong Province Applicant after: Guangdong Environment Radiation Monitoring Center Applicant after: Guangzhou Xiehe Radiation Detection Service Co., Ltd. Address before: 510300 No. 860, Guangzhou Avenue, Haizhuqu District, Guangdong, Guangzhou Applicant before: Radiation Protection Association of Guangdong Province Applicant before: Guangdong Environment Radiation Monitoring Center |
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