CN104483553B - A kind of RF impedance test device of electromagnetic shielding material - Google Patents
A kind of RF impedance test device of electromagnetic shielding material Download PDFInfo
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- CN104483553B CN104483553B CN201410843174.4A CN201410843174A CN104483553B CN 104483553 B CN104483553 B CN 104483553B CN 201410843174 A CN201410843174 A CN 201410843174A CN 104483553 B CN104483553 B CN 104483553B
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- screw rod
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- electromagnetic shielding
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Abstract
The invention provides a kind of RF impedance test device of electromagnetic shielding material, including screw rod, screw rod lower outside is provided with shielding outer cover, and bearing is fixed on screw rod, and pressure sensor is connected on bearing；Upper shielding cavity is connected with shielding shield base, and lower shielding cavity is fixed with upper shielding cavity, is provided with upper and lower metal crimp piece in the shielding cavity between upper and lower shielding cavity, upper metal crimp piece is connected with pressure sensor；Electromagnetic shielding material to be tested is located between upper and lower metal crimp piece, the upper test probe being fixed on shielding cavity is connected by cable with adapter, the adapter other end is connected by cable with the tester for reading RF impedance value, tester is connected by cable with lower test probe, and lower test probe penetrates lower metal crimp piece and contacted with upper metal crimp piece.The present apparatus can monitor the electromagnetic shielding material overlap joint RF impedance under different compression corresponds in real time, and applicability is high, and easy to operate.
Description
Technical field
The present invention relates to a kind of RF impedance test device of electromagnetic shielding material, is mainly used in testing electromagnetic shielding material
In 30~1000MHz radio frequency bond impedance, the radio frequency overlap joint resistance of testee can be known in real time by vector network analyzer
It is anti-, and the electromagnetic shielding material RF impedance different in different compression can be reflected, belong to EMC Design technology
Field.
Background technology
Currently on the market to electromagnetic shielding conductive material, such as conducting foam, conductive gasket, metal spring leaf, impedance is carried out
All it is to use universal meter during test, the result measured is DC impedance, does not consider the impedance in the case of different frequency.
Radio frequency resistance is carried out in the electromagnetic shielding conductive material that product arrived used in the process of EMC Design or rectification
During anti-test, electromagnetic shielding conductive material can often occur supplier's offer material in actually rectification application and be measured with universal meter
When impedance it is good, and go wrong when importeding into product, electromagnetic screen used when the design phase product design also occurring
Conductive material is covered, has no idea to measure the radio frequency of material when can be designed that required preferable RF impedance, and processing
Impedance, and shielding material can just meet RF impedance requirement in the case of how many decrement.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of electromagnetic screen that can be monitored in real time under different compression corresponds to
Cover the test device of material overlap joint RF impedance.
In order to solve the above-mentioned technical problem, the technical scheme is that providing a kind of RF impedance of electromagnetic shielding material
Test device, it is characterised in that：Including screw rod, screw tip is provided with rotary handle, and screw rod lower outside is provided with shielding outer cover, axle
Hold and be fixed on screw rod and be connected to located at shielding outer cover inner side, pressure sensor on bearing；
Upper shielding cavity is connected with shielding shield base, and lower shielding cavity is fixed with upper shielding cavity, upper and lower shielding cavity
Between shielding cavity in be provided with upper metal crimp piece and lower metal crimp piece, upper metal crimp piece passes through plastics connecting shaft and pressure
Sensor connects；
Electromagnetic shielding material to be tested is located between upper and lower metal crimp piece, the upper survey being fixed on shielding cavity
Sound out pin to be connected with the adapter being fixed on shielding outer cover by cable, the adapter other end is by cable with penetrating for reading
The tester connection of frequency impedance value, tester are connected by cable with lower test probe, and lower test probe penetrates lower metal
Compressing piece contacts with upper metal crimp piece.
Preferably, the screw rod is provided with the scale for being used for observing displacement.
Preferably, the screw rod, which is provided with, is used to prevent lower position block of the rotary handle infinitely toward backspin.
Preferably, it is provided with the screw rod fixed block for being used for limiting screw rod zone of action between the screw rod and shielding outer cover.
Preferably, the shielding outer cover is provided with hand handle.
Preferably, the lower shielding cavity is fixed by hasp and upper shielding cavity.
Preferably, the material of the upper and lower metal crimp piece is copper.
Preferably, the lower shielding cavity bottom is provided with lower probe fixture, and the lower test probe is located at lower probe
In fixing device.
Preferably, the plastics connecting shaft is connected through the upper shielding cavity with the pressure sensor.
Preferably, the lower shielding cavity bottom is provided with support feet.
The present invention is in use, upper and lower shielding cavity will overlap completely is electrically overlapped with forming Low ESR, determinand electromagnetism
Shielding material is placed on lower metal crimp piece, and tester exports electric signal and is connected by coaxial cable with lower test probe,
Lower test probe penetrates lower metal crimp piece, and rotary handle causes metal crimp piece and lower test probe and electromagnetic shielding material
Contact, and displacement is produced by pressure electromagnetic shielding conductive material, electromagnetic shielding material and metal crimp piece are produced with this
On radio frequency bond impedance, by tester read signal can obtain radio frequency bond impedance.
Compared with prior art, the RF impedance test device of electromagnetic shielding material provided by the invention has following beneficial
Effect：
1st, the present apparatus uses shielding outer cover, upper shielding cavity, lower shielding cavity are integrally formed for metal material, energy
Shielding external interference well so that test device is easier to realize and tested under the presence electromagnetic environment of harshness, without costliness
Shielding indoor test, substantially increase applicability.
2nd, the present apparatus employs scale, pressure sensor double technique, it is ensured that under monitoring different compression is corresponding in real time
Electromagnetic shielding material overlap joint RF impedance.
3rd, mistake proofing design is employed in device, such as lower position block, bearing, pilot pin.Lower position block ensure that personnel's maloperation
Also the damage for testing probe will not be caused.Design and installation has connection litter by bearing, and guarantee will not rock.Shield outer cover with
Pilot pin is provided between upper shielding cavity, upper shielding cavity and lower shielding cavity, ensures that during installation wrong position, Yi Jishi will not be put
Now preferably align.
4th, upper golden, the lower metal crimp piece that the present apparatus uses can change unlike material, to simulate service condition in practice.
Such as need to change electromagnetic shielding material, such as use electronic hoisting device, upper shielding cavity need to only be taken with what lower shielding cavity was fixed
Button unclamps, and the rotary handle sling on shielding outer cover is i.e. conveniently replaced.
Brief description of the drawings
Fig. 1 is the RF impedance test device structural representation of electromagnetic shielding material；
Fig. 2 is the RF impedance test device actual test electrical schematics of electromagnetic shielding material.
Embodiment
To become apparent the present invention, hereby with a preferred embodiment, and accompanying drawing is coordinated to be described in detail below.
Fig. 1 be electromagnetic shielding material provided by the invention RF impedance test device structural representation, described electromagnetism
The RF impedance test device of shielding material includes rotary handle 1, and screw rod 3 is fixed together with rotary handle 1, and scale 2 is bonded at
On screw rod 3, to observe displacement, lower position block is screwed on screw rod 3, and position is adjustable.The lower outside of screw rod 3 is set
There is shielding outer cover 10, shielding outer cover 10 can shield the electromagnetic interference of free surrounding space.Screw rod fixed block 5 is threaded, and outer with shielding
The connection of cover 10, play a part of limiting the zone of action of screw rod 3.Hand handle 6 is welded on shielding outer cover 10, is changed electromagnetic shielding and is led
Hand handle 6 need to only be lifted during electric material.
Bearing 7 is fixed on screw rod 3 by thread, and bearing 7 is positioned at the inner side of shielding outer cover 10, in the side design and installation of bearing 7
There is connection litter, guarantee will not rock.Pressure sensor 9 is connected on bearing 7, and plastics connecting shaft 11, which is opened, is threadedly secured in pressure
On sensor 9, upper metal crimp piece 15 is fixed in plastics connecting shaft 11 by sunk screw, therefore during the rotation of rotary handle 1,
Upper metal crimp piece 15 is understood therewith or is moved upwardly or downwardly, and upper shielding cavity 12 passes through screw and connected with shielding outer cover 10 bottom
Connecing, lower shielding cavity 13 is fixed by hasp and upper shielding cavity 12, and upper test probe 14 is fixed on shielding cavity 12, under
Limited block can prevent rotary handle 1 infinitely toward backspin, protection test probe.
Upper test probe 14 is connected by coaxial cable with the SMA types adapter 8 being fixed on shielding outer cover 10, SMA types
The other end of adapter 8 is connected reading signal by coaxial cable with tester vector network analyzer can obtain bond impedance,
Certain premise also needs to tester transmission signal and is connected by coaxial cable with lower test probe 17, and lower test probe 17 is installed
On lower probe fixture 18, lower probe fixture 18 is located at the lower bottom of shielding cavity 13, and lower metal crimp piece 16 is located at
On lower shielding cavity 13, the probe of lower test probe 17 will penetrate lower metal crimp piece 16, will be with upper metal crimp during test
Piece 15 is contacted, and electromagnetic shielding material is placed between metal crimp piece 15 and lower metal crimp piece 16, and complete electricity is formed with this
Gas test path.Support feet 19 is fixed with lower shielding cavity 13, forms a single unit system.
Fig. 2 is the RF impedance test device actual test electrical schematics of electromagnetic shielding material provided by the invention, from
It can be seen that upper metal crimp piece 15 is fixed in plastics connecting shaft 11 in Fig. 2, and plastics connecting shaft 11 will penetrate shielding cavity
Body 12 so that can be connected with pressure sensor 9, upper shielding cavity 12 will overlap to be formed completely when being tested with lower shielding cavity 13
Low ESR electrically overlaps.During test, determinand electromagnetic shielding conductive materials conductive foam is placed on lower metal crimp piece 16,
Instrument exports electric signal and is connected by coaxial cable with lower test probe 17, and lower test probe 17 penetrates lower metal crimp piece 16,
Rotary handle 1 causes upper metal crimp piece 15 and lower test probe 17 and electromagnetic shielding conductive material, and is made by pressure
Obtain electromagnetic shielding conductive material and produce displacement, electromagnetic shielding material and the radio frequency bond impedance on metal crimp piece are produced with this.
Completely to measure impedance value also needs test probe 14 to be contacted with upper metal crimp piece 15 well, upper test probe 14 and SMA types
Adapter 8 connects, and SMA types adapter 8 returns to electric signal on tester by coaxial cable.Electrically flowed through by haveing suffered
Tester is with regard to that can measure electromagnetic shielding material and the bond impedance on compressing piece behind path.
Upper and lower metal crimp piece material can select according to the actual requirements, and lower metal crimp piece passes through internal notches energy
It is fully immersed in lower shielding cavity, realizes that low-resistance overlaps.Upper and lower metal crimp piece material typically uses copper, from it is copper be because
For most product casings be used to selecting when EMI is shielded for copper, therefore the RF impedance now measured is led for electromagnetic shielding
Bond impedance between electric material and print copper.
Upper test probe 14 is placed on the position of shielding cavity 12 by emulation, 50 ohmages when being tested with realizing
Connection.Pressure sensor 9 coordinates by can accurately show the pressure being applied on electromagnetic shielding material after calibration, and with scale 2,
Monitoring bond impedance in real time.
The present apparatus can use under the electromagnetic space environment of harshness, and applicability is very good, and employs very hommization
Mistake proofing design so that different personnel's misoperations also will not generating means internal components damage, test when, in order to simulate
The needs of actual design person, crimping the material of plate can change, to obtain electromagnetic shielding material and different metal materials overlap joint
Different radio frequency impedance, while the present apparatus is also devised with scale, pressure sensor, can obtain the overlap joint RF impedance measured in real time
Value, and the decrement corresponding to design ideal impedance value is obtained, the decrement easily can be read from scale.
Claims (10)
- A kind of 1. RF impedance test device of electromagnetic shielding material, it is characterised in that：Including screw rod (3), set at the top of screw rod (3) There is rotary handle (1), screw rod (3) lower outside is provided with shielding outer cover (10), and bearing (7) is fixed on screw rod (3) and located at screen Cover on the inside of outer cover (10), pressure sensor (9) is connected on bearing (7)；Upper shielding cavity (12) is connected with shielding outer cover (10) bottom, and lower shielding cavity (13) is fixed with upper shielding cavity (12), Upper metal crimp piece (15) and lower metal crimp piece (16), upper metal crimp are provided with shielding cavity between upper and lower shielding cavity Piece (15) is connected by plastics connecting shaft (11) with pressure sensor (9)；Electromagnetic shielding material to be tested is located between upper and lower metal crimp piece, the upper survey being fixed on shielding cavity (12) Sound out pin (14) to be connected with the adapter (8) being fixed on shielding outer cover (10) by cable, adapter (8) other end passes through electricity Cable is connected with the tester for reading RF impedance value, and tester is connected by cable with lower test probe (17), under Test probe (17) penetrates lower metal crimp piece (16) and contacted with upper metal crimp piece (15).
- A kind of 2. RF impedance test device of electromagnetic shielding material as claimed in claim 1, it is characterised in that：The screw rod (3) it is provided with the scale (2) for being used for observing displacement.
- A kind of 3. RF impedance test device of electromagnetic shielding material as claimed in claim 1, it is characterised in that：The screw rod (3) it is provided with the lower position block for being used for preventing the rotary handle (1) infinitely toward backspin.
- A kind of 4. RF impedance test device of electromagnetic shielding material as claimed in claim 1, it is characterised in that：The screw rod (3) the screw rod fixed block (5) for being used for limiting screw rod (3) zone of action is provided between shielding outer cover (10).
- A kind of 5. RF impedance test device of electromagnetic shielding material as claimed in claim 1, it is characterised in that：The shielding Outer cover (10) is provided with hand handle (6).
- A kind of 6. RF impedance test device of electromagnetic shielding material as claimed in claim 1, it is characterised in that：The lower screen It is fixed by hasp and upper shielding cavity (12) to cover cavity (13).
- A kind of 7. RF impedance test device of electromagnetic shielding material as claimed in claim 1, it is characterised in that：On described, The material of lower metal crimp piece is copper.
- A kind of 8. RF impedance test device of electromagnetic shielding material as claimed in claim 1, it is characterised in that：The lower screen Cover cavity (13) bottom and be provided with lower probe fixture (18), the lower test probe (17) is located at lower probe fixture (18) On.
- A kind of 9. RF impedance test device of electromagnetic shielding material as claimed in claim 1, it is characterised in that：The plastics Connecting shaft (11) is connected through the upper shielding cavity (12) with the pressure sensor (9).
- A kind of 10. RF impedance test device of electromagnetic shielding material as claimed in claim 1, it is characterised in that：Under described Shielding cavity (13) bottom is provided with support feet (19).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410843174.4A CN104483553B (en) | 2014-12-25 | 2014-12-25 | A kind of RF impedance test device of electromagnetic shielding material |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410843174.4A CN104483553B (en) | 2014-12-25 | 2014-12-25 | A kind of RF impedance test device of electromagnetic shielding material |
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| CN104483553A CN104483553A (en) | 2015-04-01 |
| CN104483553B true CN104483553B (en) | 2017-12-12 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104914311A (en) * | 2015-06-09 | 2015-09-16 | 隆扬电子（昆山）有限公司 | Compression impedance test device |
| CN109425787B (en) * | 2017-08-23 | 2020-12-11 | 中车株洲电力机车研究所有限公司 | Radio frequency lap joint impedance measuring device and manufacturing and measuring method thereof |
| CN112147410B (en) * | 2020-09-15 | 2021-11-30 | 海宁利伊电子科技有限公司 | Multi-frequency point radio frequency impedance and current testing system |
| CN116819180B (en) * | 2023-08-30 | 2023-11-21 | 山东劲拓新材料科技有限公司 | Device for testing ground impedance of electromagnetic shielding film of single FPC (flexible printed circuit) |
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| CN2896294Y (en) * | 2006-03-31 | 2007-05-02 | 汉达精密电子(昆山)有限公司 | High-frequency wire characteristic impedance detection board |
| CN101782609A (en) * | 2009-10-21 | 2010-07-21 | 芯通科技（成都）有限公司 | Low radio frequency impedance measuring equipment |
| KR20110065817A (en) * | 2009-12-10 | 2011-06-16 | 대구대학교 산학협력단 | Impedance measuring device and method of rfid tag antenna |
| CN204439718U (en) * | 2014-12-25 | 2015-07-01 | 上海电器科学研究所（集团）有限公司 | The radio-frequency (RF) impedance proving installation of electromagnetic shielding material |
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| CN2896294Y (en) * | 2006-03-31 | 2007-05-02 | 汉达精密电子(昆山)有限公司 | High-frequency wire characteristic impedance detection board |
| CN101782609A (en) * | 2009-10-21 | 2010-07-21 | 芯通科技（成都）有限公司 | Low radio frequency impedance measuring equipment |
| KR20110065817A (en) * | 2009-12-10 | 2011-06-16 | 대구대학교 산학협력단 | Impedance measuring device and method of rfid tag antenna |
| CN204439718U (en) * | 2014-12-25 | 2015-07-01 | 上海电器科学研究所（集团）有限公司 | The radio-frequency (RF) impedance proving installation of electromagnetic shielding material |
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Effective date of registration: 20190620 Address after: 2000 63 No. 9 Building, 505 Wuning Road, Putuo District, Shanghai Co-patentee after: Shanghai Electrical Apparatus Research Institute (Group) Co., Ltd. Patentee after: Shanghai robotics Industrial Technology Research Institute Co., Ltd. Co-patentee after: Shanghai Electrical Apparatus Research Institute Address before: No. 505 Wuning Road, Putuo District, Shanghai 200043 Co-patentee before: Shanghai Electrical Apparatus Research Institute Patentee before: Shanghai Electrical Apparatus Research Institute (Group) Co., Ltd. |
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