CN109640608A - A kind of rectangular opening metal cavity improving shield effectiveness - Google Patents
A kind of rectangular opening metal cavity improving shield effectiveness Download PDFInfo
- Publication number
- CN109640608A CN109640608A CN201811251789.2A CN201811251789A CN109640608A CN 109640608 A CN109640608 A CN 109640608A CN 201811251789 A CN201811251789 A CN 201811251789A CN 109640608 A CN109640608 A CN 109640608A
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- Prior art keywords
- rectangular opening
- cavity
- shield effectiveness
- metal
- metal cavity
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Classifications
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0007—Casings
- H05K9/0049—Casings being metallic containers
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/08—Measuring electromagnetic field characteristics
- G01R29/0807—Measuring electromagnetic field characteristics characterised by the application
- G01R29/0814—Field measurements related to measuring influence on or from apparatus, components or humans, e.g. in ESD, EMI, EMC, EMP testing, measuring radiation leakage; detecting presence of micro- or radiowave emitters; dosimetry; testing shielding; measurements related to lightning
- G01R29/0835—Testing shielding, e.g. for efficiency
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/001—Measuring interference from external sources to, or emission from, the device under test, e.g. EMC, EMI, EMP or ESD testing
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Abstract
The present invention provides a kind of rectangular opening metal cavity for improving shield effectiveness.The metal cavity includes: a rectangular opening, can be located at the arbitrary face of the metal cavity, and the center of aperture is overlapped with the center in cavity face where it, and each parallel to ground, the thickness of aperture is equal to the thickness of wire chamber body wall on two sides up and down of aperture；Metal mesh, it is equal with bore size, it is mounted at rectangular opening；Two suction wave dieelctric sheets, one is mounted on the inner wall of aperture opposite face, another is mounted on the inner wall in wherein any one face in 4 faces adjacent with aperture face.Metal mesh is installed in tapping by the metal cavity to rectangular opening, and the method for wave dieelctric sheet is inhaled in wall installation in the cavity, improve field strength loss inside metal cavity, influence of the metal cavity resonance effect to shield effectiveness is reduced, so that metal cavity has a distinct increment in the shield effectiveness of high and low frequency section.
Description
Technical field
The present invention relates to the EMC Design fields in wireless communication, and in particular to a kind of raising rectangular opening wire chamber
The technology of body shield effectiveness.
Background technique
Electromagnet shield effect refers under the same level of drive, the power or field strength and have screen that when unshielded body receives
The ratio between received power or field strength when material are covered, and expressed in logarithmic.Shield effectiveness be reflection shield performance important performance it
One, it is mainly guard shield body internal unit or system not by external electromagnetic wave interference.Metal cavity is preferable due to having
Effectiveness and be widely used in various shielding occasions.Since equipment or system have the demands such as ventilation, cabling, metal cavity is logical
Aperture often can be artificially set, and electromagnetic signal can enter internal unit or system from aperture, reduce the shielding effect of metal cavity
Energy.Meanwhile metal cavity has resonance effect, causes to enhance in certain frequency range electromagnetic signals, equally reduces metal cavity
Shield effectiveness.
For improving the research of rectangular opening Shielding Effectiveness of Metal Enclosure, relevant patent and paper are less.Central Plains engineering
A kind of " seam mark structure for improving electromagnetic shielding clothing shield effectiveness " patent (publication number: CN206324264U) of institute, discloses
A kind of seam mark structure improving electromagnetic shielding clothing shield effectiveness, the sewing thread including suturing fabric and metallic conduction, stylolite
At least two layers of material, suture fabric include top layer's fabric and lowest level fabric, and sewing thread is sewn on suture fabric and forms seam
Mark and pin hole, the seam mark are single seam mark or compound seam mark.Seam mark structure type multiplicity by adopting the above technical scheme, technique
Simply, low in cost, effectively improve shield effectiveness.A kind of " wide-band screen of small-sized shielding case of Xian Electronics Science and Technology University
Cover performance testing device and method " small-sized screen of the patent (publication number: CN105116249A) to unilateral side length less than 4U (177mm)
Cover cabinet carry out shield effectiveness test, test device include small-sized receiving antenna, bi-directional RF connector, amplifier, signal source,
Receiver etc..Since small-sized machine box itself has resonance frequency point, by selecting corresponding magnetic loss after calculating acquisition resonance frequency point
Type absorbing material is pasted at cabinet lumen centers, meets the test to its wide-band shield effectiveness.Believe new material section in Jiangsu five
Skill Co., Ltd " a method of improve multipath cable sealing device electromagnet shield effect " patent (publication number:
CN105071321A) be related to it is a kind of improve multipath cable sealing device electromagnet shield effect method, by make whole device at
For a continuous conduction body and magnetic conductor, the promotion of electromagnet shield effect is realized.Compared with common metal foil, electromagnet shield effect
It greatly improves, and can realize effective shielding of full frequency band electromagnetic wave.
Research paper " the shadow of the inner window structure to aperture rectangular cavities near field shield effectiveness of 2013 " Acta Physica Sinica "
Ring " in, researcher considers the practical structures of electronic equipment, and in conjunction with the transmission line method of extension, analysis is discussed in aperture cavity
Influence of portion's window structure to cavity shield effectiveness.Different partition shapes and the width that cracks under being irradiated by analytical calculation electric dipole
Degree finds the near field shield effectiveness of window structure cavity built in aperture to the equivalent impedance of window and the influence of cavity shield effectiveness
It is inferior to far-field shielding efficiency, and that the shield effectiveness of cavity and the first resonance frequency are occurred is larger for different metal window structure
Change.By carrying out CST computer sim- ulation to identical electromagnetic problem, it was demonstrated that the equivalent circuit method of use is correctly feasible, this
Consider that the equivalent circuit method of near-field effect compensates for the too low drawback of full wave analysis computational efficiency, can be research and engineering people
Member's analysis complicated cavity near field shield effectiveness provides guidance and reference.
Research paper " the electromagnet shield effect of the metal cavity of medium conductive material covering of 2014 " Acta Physica Sinica "
Research " in, researcher is based on transmission line and waveguide theory, proposes a kind of for calculating the gold for covering medium conductive material
Belong to the analytic theory model of cavity electromagnet shield effect, and by and the comparing check of the full-wave electromagnetic analog result model
Validity.The position effect and resonance effect for analyzing shield shield effectiveness are calculated, a kind of evaluation conductive material electricity is established
The method of magnetic screen efficiency can weaken the influence of resonance effect and position effect well, directly reflect the electricity of material itself
Magnetic screen efficiency.
The research paper of 2014 " Hebei Normal University Journal (natural science edition) " is " with tapping machine under complex electromagnetic environment
The shield effectiveness of case " in, researcher utilizes reverberation chamber technical modelling complex electromagnetic environment, studies band under complex electromagnetic environment and opens
The shield effectiveness of hole chassis shell body.Perforated area, hole shape, a timing the number of openings are had studied respectively to aperture shielding case body
The influence of shield effectiveness.Researcher is in the certain situation of the aperture gross area, by way of increasing the number of openings, in radio-frequency head
Divide the shield effectiveness for improving metal cavity, there is certain reference value to the electromagnetic protection design with aperture cabinet.
Summary of the invention
The purpose of the present invention is provide a kind of rectangular opening metal cavity that can improve shield effectiveness.By pacifying in tapping
The metal mesh with the same size of aperture is set, and in the multiple modes for inhaling wave medium of metal cavity positioned inside, reduces wire chamber
Intracorporal EMR electromagnetic resonance effect.By comparative analysis, in special frequency channel (100MHz~2GHz), rectangular opening is significantly improved
The electromagnet shield effect of metal cavity.
In order to achieve the above object, the present invention provides a kind of rectangular opening metal cavity for improving shield effectiveness, include:
One rectangular opening, positioned at the arbitrary face of the metal cavity, the center of rectangular opening is overlapped with the center in cavity face where it；
Metal mesh is mounted at the rectangular opening；At least one inhales wave dieelctric sheet, is mounted on the inner wall of cavity.
The thickness of the rectangular opening is equal to the thickness of the wire chamber body wall, and two sides up and down of rectangular opening are parallel
In ground.
The metal mesh and the rectangular opening are equal sized.
The metal cavity also includes two suction wave dieelctric sheets, and one is mounted on the inner wall of aperture opposite face, another peace
Inner wall mounted in wherein any one face in 4 faces adjacent with aperture face.
For the metal cavity with aperture, portion has apparent resonance effect to electromagnetic signal in the cavity, in certain frequencies
Electromagnetic energy signal enhancing is had at section, leads to the decline of Shielding Effectiveness of Metal Enclosure.Compared with prior art, of the invention to mention
The rectangular opening metal cavity of high shield effectiveness and its beneficial effect of screen method are: by tapping placement and aperture
The metal mesh of same size, and in the multiple modes for inhaling wave media of metal cavity positioned inside, it is equal with high band in low-frequency range
The shield effectiveness of metal cavity can be significantly improved.
Detailed description of the invention
In order to illustrate more clearly of technical solution of the present invention, attached drawing needed in description will be made simply below
It introduces, it should be apparent that, the accompanying drawings in the following description is one embodiment of the present of invention, and those of ordinary skill in the art are come
It says, without creative efforts, is also possible to obtain other drawings based on these drawings:
Fig. 1 installs metal mesh and inhales the rectangular opening metal cavity of wave dieelctric sheet.
Fig. 2 metal mesh.
Fig. 3 rectangular opening metal cavity.
Fig. 4 rectangular opening Shielding Effectiveness of Metal Enclosure figure.
Fig. 5 rectangular opening metal cavity installs the shield effectiveness figure after metal mesh.
Fig. 6 rectangular opening metal cavity installs metal mesh and inhales the shield effectiveness figure after wave dieelctric sheet.
Fig. 7 rectangular opening metal cavity is not installing any substance, installation metal mesh, installation metal mesh and is inhaling wave medium
Shield effectiveness comparison diagram in the case of three kinds of piece.
In figure: wave dieelctric sheet, 4 suction wave dieelctric sheets, 5 external sources, 6, electric field, 7 are inhaled in 1 metal cavity, 2 metal meshes, 3
Strong monitoring point, 8, rectangular opening.
Specific embodiment
The technical features, objects and effects for a better understanding of the present invention with reference to the accompanying drawing carry out more the present invention
To describe in detail.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not used to limit this
Patent of invention.It should be noted that being all made of very simplified form in these attached drawings and using non-accurate ratio, only use
In convenience, clearly aid in illustrating the invention patent.
Please refer to Fig. 1 and Fig. 3, the rectangular opening metal cavity 1 of raising shield effectiveness of the invention, the metal cavity 1 is excellent
It is selected as rectangular parallelepiped structure, includes: a rectangular opening 8, positioned at the arbitrary face of the metal cavity 1, the central point of rectangular opening 8
N and cavity face AA where it1D1The center of D is overlapped；Metal mesh 2 is mounted at the rectangular opening 8；At least one inhales wave medium
Piece 3 or 4 is mounted on the inner wall of metal cavity 1.
Referring to Fig. 1, in a specific embodiment of the present invention, the long D of the metal cavity 11C1For 0.6m, width A1D1For
0.5m, high DD1For 0.5m；Wire chamber dignity AA where rectangular opening 81D1D size be 0.5m × 0.5m, cavity wall with a thickness of
0.5mm。
Referring to Fig. 3, the thickness of the rectangular opening 8 be equal to the wire chamber body wall thickness, rectangular opening 8 up and down
Two sides are each parallel to ground, and the size of rectangular opening 8 is 0.2m × 0.2m in specific embodiments of the present invention；
Referring to Fig. 2, the metal mesh 2, equal sized with the rectangular opening 8.In a specific embodiment of the present invention,
The metal mesh 2 is the square of 0.2m × 0.2m, and inside is uniform grid, and each grid is the square of 10mm × 10mm.
Referring to Fig. 1, described two suction wave dieelctric sheets 3 and 4, one is mounted on the inner wall of 8 opposite face of rectangular opening, another
The inner wall in a wherein any one face for being mounted on 4 faces adjacent with aperture face.It is opposite that suction wave dieelctric sheet 3 is mounted on aperture
Face BB1C1The inner wall of C inhales the inner wall that wave dieelctric sheet 4 is mounted on wherein any one face in 4 faces adjacent with aperture face, this
Wave dieelctric sheet 4 is inhaled in embodiment is mounted on DD1C1The inner wall in the face C.
In a specific embodiment of the present invention, the medium electromagnetic parameter of selected suction wave dieelctric sheet 3 and 4 are as follows: opposite to be situated between
Electric constant εrIt is 10, relative permeability μrIt is 4, dielectric loss angle tan (δe) it is 0.2, magnetic loss angle tan (δm) it is 0.5.Inhale wave
The size of dieelctric sheet 3 is 0.498m × 0.498m, with a thickness of 0.005m.The size for inhaling wave dieelctric sheet 4 is 0.598m × 0.498m,
With a thickness of 0.005m.
Fig. 1 and Fig. 3 are please referred to, it, can also structure using the rectangular opening metal cavity provided by the invention for improving shield effectiveness
A Shielding Effectiveness of Metal Enclosure analysis system is built, which includes: the horizontal positioned metal cavity 1 with rectangular opening 8,
The central point N of the rectangular opening 8 and cavity face AA where it1D1The center of D is overlapped, and the thickness of the rectangular opening 8 is equal to institute
The thickness of wire chamber body wall is stated, two sides up and down of the rectangular opening 8 are each parallel to ground；Field strength monitoring point 7 is arranged at this
The inside of metal cavity 1, and be located at the center of metal cavity 1, i.e., it is contour with the central point N of rectangular opening 8；External source 5,
The outside of the metal cavity 1 is set, it is contour with the field strength monitoring point 7, and it is greater than institute at a distance from the field strength monitoring point 7
State the maximum value of the length of metal cavity 1；The aperture face AA1D1D is located at the external source 5 and field strength prison
Between measuring point 7, and the central point N of the external source 5, the rectangular opening, the field strength monitoring point 7 are in straight line
On；The external source 5 sends plane wave excitation in certain frequency range, by certain frequency to the field strength monitoring point 7；Electric field
6, it is arranged at the external source 5, and the direction of an electric field is vertical with the direction of the launch of the external drive 5；
The Shielding Effectiveness of Metal Enclosure analysis system also includes: metal mesh 2, equal with bore size 8, is mounted on described
At the aperture 8 of rectangular opening metal cavity；Two suction wave dieelctric sheets 3 and 4 inhale wave dieelctric sheet 3 and are mounted on aperture opposite face BB1C1C
The inner wall in face inhales the inner wall that wave dieelctric sheet 4 is mounted on wherein any one face in 4 faces adjacent with aperture face, this implementation
Wave dieelctric sheet 4 is inhaled in example is mounted on DD1C1The inner wall in the face C.
The present invention utilizes above-mentioned Shielding Effectiveness of Metal Enclosure analysis system, additionally provides a kind of Shielding Effectiveness of Metal Enclosure
Measurement method, the measurement method the following steps are included:
The value of S1, measurement 1 length of rectangular opening metal cavity；
S2, setting field strength monitoring point 7, are highly the 8 place cavity face AA of rectangular opening1D1The length of D or wide half；
S3, setting external source 5, it is contour with the field strength monitoring point 7 and big at a distance from the field strength monitoring point 7
In the maximum value of 1 length of metal cavity；
S4, setting electric field 6, the electric field is arranged at the external source 5, and the direction of an electric field and the outside
Motivate the direction of the launch vertical；
S5, the electric field 6 and the external drive 5 are started to work, and the external source 5 is to the field strength monitoring point 7
It irradiates, records under different frequency range, the EMV electromagnetic value of the field strength monitoring point 7 by certain frequency, with the uniform plane wave of different frequency range
Eo；
S6, it keeps the field strength monitoring point 7, the external source 5, the electric field 6 constant, is horizontally arranged the rectangle
The metal cavity 1 of aperture, so that the aperture face AA1D1D between the external source 5 and the field strength monitoring point 7,
And the central point N of the external source 5, the rectangular opening, the field strength monitoring point 7 are point-blank, the field strength
Monitoring point 7 is overlapped with the center of the metal cavity 1；
S7, the electric field 6 and the driving source 5 are started to work, and the external source 5 uses the field strength monitoring point 7
The uniform plane wave of different frequency range irradiates, and irradiates frequency range and frequency is identical as step S5, record the field under different excitation frequency ranges
The EMV electromagnetic value E of strong monitoring points；
S8, the shield effectiveness SE calculated under different excitation frequency ranges, calculation formulaAnd to motivate frequency
Section is abscissa, and the value of SE is ordinate, establishes two-dimentional shield effectiveness figure；
S9, at the aperture 8 of the metal cavity 1 of the rectangular opening, installation one piece with the bore size size
Identical metal mesh 2 repeats S7, S8, obtains under different excitation frequency ranges, the new EMV electromagnetic value E of field strength monitoring points1, according to Es1Meter
The shield effectiveness for calculating field strength monitoring point, establishes new shield effectiveness figure, as shown in Figure 5；
S10, further increase by two suction wave dieelctric sheets 3 and 4 inside the metal cavity 1 of the rectangular opening, inhale wave and be situated between
Matter piece 3 is mounted on aperture opposite face BB1C1The inner wall of C is inhaled wave dieelctric sheet 4 and is mounted in addition to one of other 4 faces in aperture face
Inner wall inhales wave dieelctric sheet 4 in the present embodiment and is mounted on DD1C1The inner wall in the face C repeats S7, S8, obtains under different excitation frequency ranges, field
The new EMV electromagnetic value E of strong monitoring points2, according to Es2The shield effectiveness for calculating field strength monitoring point, establishes new shield effectiveness figure, such as
Shown in Fig. 6.
It is known in two-dimentional shield effectiveness figure, the value of shield effectiveness SE is higher, and to reflect shield effectiveness better；The curve of SE
Figure is gentler, illustrates that shield effectiveness is better.When SE is negative value, illustrate without shield effectiveness；
Fig. 4 is the shield effectiveness figure of rectangular opening metal cavity 1, as shown in figure 4, being situated between not disposing metal mesh 2 and inhaling wave
In the case where matter piece 3,4, the curve fluctuation of shield effectiveness SE is larger, illustrates that the 1 interior resonance effect of cavity is obvious, when excitation frequency
When section is more than 0.3GHZ, the shield effectiveness of cavity is negative substantially, has not had the effect of shielding, this illustrates the rectangular opening
Effective frequency range of metal cavity 1 is in low-frequency range, and effective range is relatively narrow.
Fig. 5 is that rectangular opening metal cavity 1 installs the shield effectiveness figure after metal mesh 2.Compared with Fig. 4, shield effectiveness has
The promotion of one entirety especially has a raising of 30dB or so at low frequency, when excitation frequency range 0.3GHZ~
When 1.3GHZ, the shield effectiveness of cavity is no longer negative value, still there is certain shield effectiveness.This explanation passes through to the rectangular opening
Metal cavity 1 installs metal mesh 2, so that the shield effectiveness at 1 low frequency of the metal cavity has larger promotion, and effective range
Further expansion.From fig. 5, it can be seen that the curve of shield effectiveness SE still fluctuation range is larger, this illustrates in metal cavity 1 also
There are resonance effect, cause to enhance in certain frequency point electromagnetic energies.When motivating frequency range to be more than 1.3GHZ, the shield effectiveness of cavity
Substantially it is negative, illustrates that, in high band, shielding action is still undesirable.
Fig. 6 is that rectangular opening metal cavity installs metal mesh and inhales the shield effectiveness figure after wave dieelctric sheet.It installs simultaneously
Metal mesh 2 and inhale wave dieelctric sheet 3,4 after, entirely analysis frequency range 0.1GHZ~2GHZ within the scope of, the value of SE reach 40dB with
On.Compared to Fig. 4, the raising at low frequency reaches 55dB.Compared with Fig. 4, Fig. 5, the curve of shield effectiveness SE is obviously gentle.
Fig. 7 is that rectangular opening metal cavity 1 is not being installed any substance, installation metal mesh 2, installation metal mesh 2 and inhaled
Wave dieelctric sheet 3,4, the shield effectiveness comparison diagram in the case of above-mentioned three kinds.Pass through the comparison of three curves in Fig. 7, it is evident that energy
Find out and metal mesh 2 is installed by the metal cavity 1 to the rectangular opening and inhales wave dieelctric sheet 3,4, further improves gold
Belong to the loss of 1 inside field strength of cavity, reduces influence of the metal cavity resonance effect to shield effectiveness, this method makes the wire chamber
Body 1 all has a distinct increment in the shield effectiveness of low frequency and high band.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto.This hair
The suction contour structures of wave dieelctric sheet of bright middle use, quantity, installation site, electromagnetic parameter, scanning range, metal grill size,
Shape and mesh size, the shape of metal cavity and size etc. are not limited solely to the specific descriptions in embodiment.This hair
The method of the bright raising metal cavity shielding properties is not limited solely to the metal cavity with rectangular opening.It is any to be familiar with sheet
Those skilled in the art in the technical scope disclosed by the present invention, can readily occur in various equivalent modifications or substitutions, this
A little modifications or substitutions should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be with claim
Protection scope subject to.
Claims (4)
1. a kind of rectangular opening metal cavity for improving shield effectiveness, which is characterized in that the cavity includes:
One rectangular opening, positioned at the arbitrary face of the metal cavity, the center at the center of rectangular opening and cavity face where it
It is overlapped；
Metal mesh is mounted at the rectangular opening；
At least one inhales wave dieelctric sheet, is mounted on the inner wall of cavity.
2. a kind of rectangular opening metal cavity for improving shield effectiveness as described in claim 1, which is characterized in that the rectangle
The thickness of aperture is equal to the thickness of the wire chamber body wall, and two sides up and down of rectangular opening are each parallel to ground.
3. a kind of rectangular opening metal cavity for improving shield effectiveness as described in claim 1, which is characterized in that the metal
Net and the rectangular opening are equal sized.
4. a kind of rectangular opening metal cavity for improving shield effectiveness as described in claim 1, which is characterized in that the cavity is also
Comprising two suction wave dieelctric sheets, one is mounted on the inner wall of aperture opposite face, another is mounted on 4 adjacent with aperture face
The inner wall in wherein any one face in face.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811251789.2A CN109640608B (en) | 2018-10-25 | 2018-10-25 | Rectangular perforated metal cavity capable of improving shielding efficiency |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811251789.2A CN109640608B (en) | 2018-10-25 | 2018-10-25 | Rectangular perforated metal cavity capable of improving shielding efficiency |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109640608A true CN109640608A (en) | 2019-04-16 |
| CN109640608B CN109640608B (en) | 2020-06-23 |
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ID=66066548
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811251789.2A Active CN109640608B (en) | 2018-10-25 | 2018-10-25 | Rectangular perforated metal cavity capable of improving shielding efficiency |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111259521A (en) * | 2020-01-09 | 2020-06-09 | 华北电力大学 | Equivalent impedance extraction method and system for opening on shielding box with rectangular metal cavity |
| CN111372436A (en) * | 2020-05-25 | 2020-07-03 | 广东电网有限责任公司佛山供电局 | Method for improving electromagnetic shielding effectiveness of local region of shielding body |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201429632Y (en) * | 2009-07-06 | 2010-03-24 | 北京邮电大学 | Portable electromagnetic shielded box |
| CN205566977U (en) * | 2016-03-31 | 2016-09-07 | 上海神添实业有限公司 | Wire chamber body opening seam circuit composite construction |
| CN108055819A (en) * | 2017-12-22 | 2018-05-18 | 广电计量检测（北京）有限公司 | Screen unit, shielding case body and shielded box |
-
2018
- 2018-10-25 CN CN201811251789.2A patent/CN109640608B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201429632Y (en) * | 2009-07-06 | 2010-03-24 | 北京邮电大学 | Portable electromagnetic shielded box |
| CN205566977U (en) * | 2016-03-31 | 2016-09-07 | 上海神添实业有限公司 | Wire chamber body opening seam circuit composite construction |
| CN108055819A (en) * | 2017-12-22 | 2018-05-18 | 广电计量检测（北京）有限公司 | Screen unit, shielding case body and shielded box |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111259521A (en) * | 2020-01-09 | 2020-06-09 | 华北电力大学 | Equivalent impedance extraction method and system for opening on shielding box with rectangular metal cavity |
| CN111259521B (en) * | 2020-01-09 | 2022-03-04 | 华北电力大学 | Equivalent impedance extraction method and system for opening on shielding box with rectangular metal cavity |
| CN111372436A (en) * | 2020-05-25 | 2020-07-03 | 广东电网有限责任公司佛山供电局 | Method for improving electromagnetic shielding effectiveness of local region of shielding body |
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| Publication number | Publication date |
|---|---|
| CN109640608B (en) | 2020-06-23 |
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