CN204314346U - Electromagnetic screen in radio frequency testing - Google Patents
Electromagnetic screen in radio frequency testing Download PDFInfo
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- CN204314346U CN204314346U CN201420503862.1U CN201420503862U CN204314346U CN 204314346 U CN204314346 U CN 204314346U CN 201420503862 U CN201420503862 U CN 201420503862U CN 204314346 U CN204314346 U CN 204314346U
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- radio frequency
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- shielded box
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- frequency testing
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Abstract
The utility model relates to the electromagnetic screen in a kind of radio frequency testing, and comprising shielded box, the inner side of described shielded box is provided with metal grill film; Equipment to be shielded is arranged in described shielded box, in described metal grill film, the aperture of each grid cell is 1/4th of described electromagnetic wavelength, metal grill film is the honeycomb metal grid film that Polygonal arrays is interconnected to constitute, the Polygonal arrays forming honeycomb metal grid film is regular hexagon array, described shielded box is hexahedron shielded box, and the side of hexahedron shielded box is cabinet baffle.Adopt the electromagnetic screen in radio frequency testing of the present utility model, the electromagnetic wave of correlated frequency in testing apparatus can be limited pass through in radio frequency testing, thus prevent electromagnetic leakage, solve the shielding problem of current radio frequency test device for the frequency of 13.5M ~ 2.4G, not only ensure the shielding properties of radio frequency test device, be convenient to install simultaneously, be easy to produce, cost is very low, has wide range of applications.
Description
Technical field
The utility model relates to communication technical field, particularly relates to radio frequency, specifically refers to the electromagnetic screen in a kind of radio frequency testing.
Background technology
In electronic equipment and electronic product, electromagnetic interference (EMI) (Electromagnetic Interference) energy is transmitted by conduction coupling and radiativity coupling.For meeting EMC Requirements, filtering technique need be adopted to be suppressed conduction coupling; Then need to adopt shield technology to be suppressed to radiativity coupling.
Shielding is exactly to the isolation carrying out metal between two area of space, to control electric field, magnetic field and electromagnetic wave by a region to the induction in another region and radiation.Specifically, be surrounded with the interference source of shield by component, circuit, subassembly, cable or whole system exactly, prevent interfere with electromagnetic field to external diffusion; With shield, receiving circuit, equipment or system are surrounded, prevent them to be subject to the impact of external electromagnetic field.Because shield absorbs energy (eddy current loss), reflected energy (boundary reflection of electromagnetic wave on shield) and counteracting energy to all playing from the outside interference electromagnetic wave such as wire, cable, component, circuit or system and internal electrical magnetic wave (electromagnetic induction produces reverse electromagnetic field on the shielding layer, can offset part disturb electromagnetic wave) effect, so shield has the function weakening interference.
The continuous rising of computer speed, the transmission speed of the digital signal of computing machine associated components is more and more faster, and electromagnetic radiation intensity is to external world also increasing simultaneously.In, unit volume increasingly intensive at current electromagnetic frequency spectrum electromagnetic power density sharply increase, low and high level device or equipment in a large number the factor such as used in combination and cause equipment and system electromagnetic environment to go from bad to worse, electromagnetic screen importance just seems more outstanding.
Utility model content
The purpose of this utility model is the shortcoming overcoming above-mentioned prior art, provide a kind of can electromagnetic interference (EMI), the electromagnetic screen prevented in electromagnetic leakage, structure are simple, cost is low, have wide range of applications radio frequency testing of testing apparatus in shielded radio frequency test.
To achieve these goals, the electromagnetic screen in radio frequency testing of the present utility model has following formation:
Electromagnetic screen in this radio frequency testing, its principal feature is, described structure comprises shielded box, and the inner side of described shielded box is provided with metal grill film; Described equipment to be shielded is arranged in described shielded box.
Further, in described metal grill film, the aperture of each grid cell is 1/4th of described electromagnetic wavelength.
Further, in described wire netting barrier film, the aperture of each grid cell is 0.0356mm.
Further, described metal grill film is the honeycomb metal grid film that Polygonal arrays is interconnected to constitute.
Further, the Polygonal arrays forming honeycomb metal grid film is regular hexagon array.
Again further, described orthohexagonal aperture is the distance between two relative summits, and the distance between these two relative summits is 1/4th of described electromagnetic wavelength.
Further, described shielded box is hexahedron shielded box, and the side of described hexahedron shielded box is cabinet baffle.
Have employed the electromagnetic screen in the utility model radio frequency testing, compared with prior art, there is following beneficial effect:
Electromagnetic screen in the utility model radio frequency testing can limit the electromagnetic wave of correlated frequency in testing apparatus in radio frequency testing to be passed through, thus prevents electromagnetic leakage, solves the electromagnetic-wave leakage problem of radio frequency test device inside; Electromagnetic screen in the utility model radio frequency testing solves the shielding problem of current radio frequency test device for the frequency of 13.5M ~ 2.4G; Electromagnetic screen in the utility model radio frequency testing is convenient to install, and be easy to produce, cost is very low, has wide range of applications.
Accompanying drawing explanation
Fig. 1 is the structural representation of the metal grill film of electromagnetic screen in radio frequency testing of the present utility model.
Embodiment
In order to more clearly describe technology contents of the present utility model, conduct further description below in conjunction with specific embodiment.
Primary processor is contained in radio frequency test device, the device of the different frequencies such as data collecting card, and the function of electromagnetic screen in this radio frequency testing is mainly in the radio frequency card function test of 13.5M ~ 2.4G wave band, effectively avoid the impact of electromagnetic interference (EMI) on test result of radio frequency test device itself.
Refer to shown in Fig. 1, the electromagnetic screen in the utility model radio frequency testing comprises shielded box, and the inner side of described shielded box is provided with metal grill film; Described equipment to be shielded is arranged in described shielded box.
In described metal grill film, the aperture of each grid cell is 1/4th of described electromagnetic wavelength.Wherein electromagnetic wavelength is cT.
Described metal grill film is the honeycomb metal grid film that Polygonal arrays is interconnected to constitute.
The Polygonal arrays forming honeycomb metal grid film is regular hexagon array.
In described wire netting barrier film, the aperture of each grid cell is 0.0356mm.Preferably, phosphor-copper net 80 orders/inch generally selected by material, string diameter 0.173mm, aperture 0.0356mm.
Phosphor-copper, adds degasser phosphorus P content 0.03 ~ 0.35% by bronze, Theil indices 5 ~ 8%, and other trace element is as iron Fe, zinc Zn etc. form ductility, and fatigue durability is all good be can be used for electrically and mechanical material, fiduciary level is higher than general copper alloy products, and phosphor-copper limit of elasticity is high, good conductivity.
Described orthohexagonal aperture is the distance between two relative summits, and the distance between these two relative summits is 1/4th of described electromagnetic wavelength.
Described shielded box is hexahedron shielded box, and the side of described hexahedron shielded box is cabinet baffle.
The area of described metal grill film equals the gross area of the inside surface of described shielded box.
Equipment to be shielded is at cabinet inside, the power supply of equipment to be shielded is also at cabinet inside, what the present invention adopted is medical specification power supply, and its external radiation interference is minimum in all kinds of power supply, can meet project demands, wire netting barrier film is at shielded box inwall, pore size is tested by reality and is determined, what metal grill film general in the market met similar specification has 10 kinds, through actual test mode, determine most suitable metal grill film, can reduce costs like this.
Described equipment to be shielded is radio frequency test device.
Described electromagnetic wave shielding device is 13.5M ~ 2.4G electromagnetic wave shielding device.Particularly frequency is the electromagnetic wave of 1G.Adjustment associated metal grid membrane aperture size, can make HFS obtain good shielding properties.If adopt this film structure of the present utility model in a large number in the inside of radio frequency test device, then radio frequency test device can be made to obtain good capability of electromagnetic shielding.
Suppress to cause the effective ways of interference to be electromagnetic screen with the form of field.Electromagnetic screen to conduct electricity or shield that permeability magnetic material is made is closed needing the region of shielding, forms electromagnetic isolation, make the electromagnetic field of its inside can not run off this region, and external radiation field can not enter this region.Electromagnetic screen can be divided into electric field shielding, magnetic field shielding and electromagnetic-field-shielded by its shielding principle.The electromagnetic screen referred generally to, shielded Electric and magnetic fields, electromagnetic screen is mainly used in the impact preventing electromagnetic field of high frequency simultaneously.
In near field region, the leakage of hole is also relevant with the characteristic of radiation source.When radiation source is electric field source, the leakage of hole is than little during far field (shield effectiveness is high), and when radiation source is Magnetic Field Source, the leakage of hole is than large (shield effectiveness is low) during far field.
When N number of measure-alike hole is arranged together, and during close proximity (distance is less than λ/2), the shield effectiveness caused drops to 20lgN1/2.Hole on not coplanar can not increase leakage, because its radiation direction is different, this feature can be used for avoiding some by force irradiated in the design.Except making the size of hole much smaller than electromagnetic wavelength, reduce beyond hole leakage away from methods such as holes with radiation source, the degree of depth increasing hole also can reduce the leakage of hole as far as possible.
Have employed the electromagnetic screen in the utility model radio frequency testing, compared with prior art, there is following beneficial effect:
Electromagnetic screen in the utility model radio frequency testing can limit the electromagnetic wave of correlated frequency in testing apparatus in radio frequency testing to be passed through, thus prevents electromagnetic leakage, solves the electromagnetic-wave leakage problem of radio frequency test device inside; Electromagnetic screen in the utility model radio frequency testing solves the shielding problem of current radio frequency test device for the frequency of 13.5M ~ 2.4G; Electromagnetic screen in the utility model radio frequency testing is convenient to install, and be easy to produce, cost is very low, has wide range of applications.
Above-described embodiment is this patent preferred embodiment; not be used for limiting practical range of the present utility model; those skilled in the art is under the prerequisite not departing from the utility model principle; the improvement done, change, combination, substitute etc., all belong within the utility model claim scope required for protection.
In this description, the utility model is described with reference to its specific embodiment.But, still can make various amendment and conversion obviously and not deviate from spirit and scope of the present utility model.Therefore, instructions and accompanying drawing are regarded in an illustrative, rather than a restrictive.
Claims (6)
1. the electromagnetic screen in radio frequency testing, is characterized in that, described device comprises shielded box, and the inner side of described shielded box is provided with metal grill film; Equipment to be shielded is arranged in described shielded box, and in described metal grill film, the aperture of each grid cell is 1/4th of described electromagnetic wavelength, and described electromagnetic frequency is 13.5M ~ 2.4G.
2. the electromagnetic screen in radio frequency testing according to claim 1, is characterized in that, in described wire netting barrier film, the aperture of each grid cell is 0.0356mm.
3. the electromagnetic screen in radio frequency testing according to claim 1, is characterized in that, described metal grill film is the honeycomb metal grid film that Polygonal arrays is interconnected to constitute.
4. the electromagnetic screen in radio frequency testing according to claim 3, is characterized in that, the Polygonal arrays forming honeycomb metal grid film is regular hexagon array.
5. the electromagnetic screen in radio frequency testing according to claim 4, it is characterized in that, described orthohexagonal aperture is the distance between two relative summits, and the distance between these two relative summits is 1/4th of described electromagnetic wavelength.
6. the electromagnetic screen in radio frequency testing according to claim 1, is characterized in that, described shielded box is hexahedron shielded box, and the side of described hexahedron shielded box is cabinet baffle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420503862.1U CN204314346U (en) | 2014-09-03 | 2014-09-03 | Electromagnetic screen in radio frequency testing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420503862.1U CN204314346U (en) | 2014-09-03 | 2014-09-03 | Electromagnetic screen in radio frequency testing |
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| Publication Number | Publication Date |
|---|---|
| CN204314346U true CN204314346U (en) | 2015-05-06 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420503862.1U Expired - Fee Related CN204314346U (en) | 2014-09-03 | 2014-09-03 | Electromagnetic screen in radio frequency testing |
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| CN (1) | CN204314346U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107221754A (en) * | 2017-05-24 | 2017-09-29 | 北京计算机技术及应用研究所 | A kind of electromagnetic energy adaptive surface for communication system Spark gap |
| CN110662409A (en) * | 2019-08-29 | 2020-01-07 | 北京邮电大学 | Electromagnetic interference shielding film of cardiac pacemaker |
| CN113838610A (en) * | 2021-10-11 | 2021-12-24 | 国网河北省电力有限公司邢台供电分公司 | Electromagnetic shielding cable for spanning high-speed railway overhead |
| WO2022110565A1 (en) * | 2020-11-24 | 2022-06-02 | 季华实验室 | Structure for suppressing electromagnetic interference and leaky waves, and radio frequency power supply and plasma etching apparatus |
-
2014
- 2014-09-03 CN CN201420503862.1U patent/CN204314346U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107221754A (en) * | 2017-05-24 | 2017-09-29 | 北京计算机技术及应用研究所 | A kind of electromagnetic energy adaptive surface for communication system Spark gap |
| CN110662409A (en) * | 2019-08-29 | 2020-01-07 | 北京邮电大学 | Electromagnetic interference shielding film of cardiac pacemaker |
| WO2022110565A1 (en) * | 2020-11-24 | 2022-06-02 | 季华实验室 | Structure for suppressing electromagnetic interference and leaky waves, and radio frequency power supply and plasma etching apparatus |
| CN113838610A (en) * | 2021-10-11 | 2021-12-24 | 国网河北省电力有限公司邢台供电分公司 | Electromagnetic shielding cable for spanning high-speed railway overhead |
| CN113838610B (en) * | 2021-10-11 | 2024-03-19 | 国网河北省电力有限公司邢台供电分公司 | Electromagnetic shielding cable line crossing high-speed railway overhead |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150506 Termination date: 20200903 |
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| CF01 | Termination of patent right due to non-payment of annual fee |