CN104483553A - Radio frequency impedance testing device for electromagnetic shielding materials - Google Patents
Radio frequency impedance testing device for electromagnetic shielding materials Download PDFInfo
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- CN104483553A CN104483553A CN201410843174.4A CN201410843174A CN104483553A CN 104483553 A CN104483553 A CN 104483553A CN 201410843174 A CN201410843174 A CN 201410843174A CN 104483553 A CN104483553 A CN 104483553A
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Abstract
The invention provides a radio frequency impedance testing device for electromagnetic shielding materials. The radio frequency impedance testing device comprises a screw, a shielding outer cover is arranged on the outer side of the lower portion of the screw, a bearing is fixed to the screw, and a pressure sensor is connected to the bearing; an upper shielding cavity is connected with the bottom of the shielding outer cover, a lower shielding cavity and the upper shielding cavity are fixed, an upper metal pressure connection sheet and a lower metal pressure connection sheet are arranged in a shielding cavity between the upper shielding cavity and the lower shielding cavity, and the upper metal pressure connection sheet is connected with the pressure sensor; the to-be-tested electromagnetic shielding materials are arranged between the upper metal pressure connection sheet and the lower metal pressure connection sheet, an upper testing probe fixed to the upper shielding cavity is connected with an adapter through a cable, the other end of the adapter is connected with a testing instrument used for reading a radio frequency impedance value through a cable, the testing instrument is connected with a lower testing probe through a cable, and the lower testing probe penetrates through the lower metal pressure connection sheet to be in contact with the upper metal pressure connection sheet. By means of the radio frequency impedance testing device, the lap joint radio frequency impedance of the electromagnetic shielding materials corresponding to different compression amounts can be monitored in real time, and the radio frequency impedance testing device is high in applicability and convenient to operate.
Description
Technical field
The present invention relates to a kind of radio-frequency (RF) impedance proving installation of electromagnetic shielding material, be mainly used in testing the radio frequency bond impedance of electromagnetic shielding material at 30 ~ 1000MHz, the radio frequency bond impedance of testee is known in real time by vector network analyzer, and can reflect and the radio-frequency (RF) impedance that electromagnetic shielding material is different when different decrements belong to EMC Design technical field.
Background technology
Now commercially to electromagnetic shielding conductive material, as conducting foam, conductive gasket, metal spring leaf etc., when carrying out testing impedance, be all adopt multimeter, the result recorded is DC impedance, does not consider the impedance in different frequency situation.
When the electromagnetic shielding conductive material used by product carries out in EMC Design or rectification process carries out radio-frequency (RF) impedance test, when electromagnetic shielding conductive material often can occur that supplier provides material multimeter to measure in reality rectification application, impedance is good, and go wrong when importing in product, electromagnetic shielding conductive material is used when the design phase also there will be product design, required desirable radio-frequency (RF) impedance can be designed, and during processing, have no idea to record the radio-frequency (RF) impedance of material, and shielding material just can meet radio-frequency (RF) impedance requirement when how many decrement.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of proving installation of the electromagnetic shielding material overlap joint radio-frequency (RF) impedance can monitored in real time under different decrement correspondences.
In order to solve the problems of the technologies described above, technical scheme of the present invention is to provide a kind of radio-frequency (RF) impedance proving installation of electromagnetic shielding material, it is characterized in that: comprise screw rod, screw tip is provided with rotary handle, screw rod lower outside is provided with shielding outer cover, bearing to be fixed on screw rod and to be located at inside shielding outer cover, and pressure transducer is connected on bearing;
Upper shielding cavity is connected with shielding shield base, and lower shielding cavity and upper shielding cavity are fixed, and are provided with metal crimp contact pin and lower metal crimp contact pin in the shielding cavity between upper and lower shielding cavity, and upper metal crimp contact pin is connected with pressure transducer by plastics coupling shaft;
Electromagnetic shielding material to be tested is located between upper and lower metal crimp contact pin, be fixed on upper test probe on shielding cavity by cable be fixed on the adapter shielded on outer cover and be connected, the adapter other end is connected with the testing tool for reading radio-frequency (RF) impedance value by cable, testing tool is connected with lower test probe by cable, and lower test probe penetrates lower metal crimp contact pin and contacts with upper metal crimp contact pin.
Preferably, described screw rod is provided with the scale for observing displacement.
Preferably, described screw rod is provided with for preventing the unlimited lower position block toward backspin of described rotary handle.
Preferably, the screw rod fixed block for limiting screw rod zone of action is provided with between described screw rod and shielding outer cover.
Preferably, described shielding outer cover is provided with hand handle.
Preferably, described lower shielding cavity is fixed by hasp and upper shielding cavity.
Preferably, the material of described upper and lower metal crimp contact pin is copper.
Preferably, be provided with lower probe fixture bottom described lower shielding cavity, described lower test probe is located on lower probe fixture.
Preferably, described plastics coupling shaft is connected with described pressure transducer through described upper shielding cavity.
Preferably, feet is provided with bottom described lower shielding cavity.
When the present invention uses, on, lower shielding cavity will overlap to form Low ESR completely and electrically overlap, determinand electromagnetic shielding material is placed in lower metal crimp contact pin, testing tool is exported electric signal and is connected with lower test probe by concentric cable, lower test probe penetrates lower metal crimp contact pin, rotary handle makes metal crimp contact pin contact with lower test probe and electromagnetic shielding material, and make electromagnetic shielding conductive material produce displacement by pressure, the radio frequency bond impedance in electromagnetic shielding material and metal crimp contact pin is produced with this, by testing tool read signal radio frequency bond impedance.
Compared with prior art, the radio-frequency (RF) impedance proving installation of electromagnetic shielding material provided by the invention has following beneficial effect:
1, this device adopts shielding outer cover, upper shielding cavity, lower shielding cavity are metal material, and it is one-body molded, well can shield external interference, make proving installation more easily realize harshness there is electromagnetic environment under test, without the need to the screened room build-in test of costliness, substantially increase applicability.
2, this device have employed scale, pressure transducer double technique, guarantees the electromagnetic shielding material overlap joint radio-frequency (RF) impedance under the decrement correspondence that monitoring is different in real time.
3, have employed mistake proofing design in device, as lower position block, bearing, pilot pin.Lower position block ensure that personnel's maloperation also can not cause the damage of test probe.Have connection litter in the other design and installation of bearing, guarantee can not be rocked.Shield outer cover and upper shielding cavity, between upper shielding cavity and lower shielding cavity, be provided with pilot pin, ensure can not put wrong position when installing, and realize better aligning.
4, this device uses upper gold, lower metal crimp contact pin can change unlike material, to simulate the service condition in reality.As need electromagnetic shielding material be changed, as adopted electric crane lifting device, only the hasp that upper shielding cavity is fixing with lower shielding cavity need be unclamped, slinging and shielding rotary handle on outer cover and conveniently replaced.
Accompanying drawing explanation
Fig. 1 is the radio-frequency (RF) impedance proving installation structural representation of electromagnetic shielding material;
Fig. 2 is the actual detecting electric schematic diagram of radio-frequency (RF) impedance proving installation of electromagnetic shielding material.
Embodiment
For making the present invention become apparent, hereby with a preferred embodiment, and accompanying drawing is coordinated to be described in detail below.
Fig. 1 is the radio-frequency (RF) impedance proving installation structural representation of electromagnetic shielding material provided by the invention, the radio-frequency (RF) impedance proving installation of described electromagnetic shielding material comprises rotary handle 1, screw rod 3 and rotary handle 1 are fixed together, scale 2 is bonded on screw rod 3, to observe displacement, lower position block is screwed on screw rod 3, and position is adjustable.Screw rod 3 lower outside is provided with shielding outer cover 10, and shielding outer cover 10 can shield the electromagnetic interference (EMI) of free surrounding space.Screw rod fixed block 5 is threaded, and is connected with shielding outer cover 10, plays the effect of restriction screw rod 3 zone of action.Hand is be welded on shielding outer cover 10 6, only need mention hand 6 when changing electromagnetic shielding conductive material.
Bearing 7 is fixed on screw rod 3 by thread, and bearing 7 is positioned at inside shielding outer cover 10, and have connection litter in the other design and installation of bearing 7, guarantee can not be rocked.Pressure transducer 9 is connected on bearing 7; plastics coupling shaft 11 is opened screw thread and is fixed on pressure transducer 9; upper metal crimp contact pin 15 is fixed on plastics coupling shaft 11 by sunk screw; therefore when rotary handle 1 rotates; upper metal crimp contact pin 15 can be moved thereupon or up or down; upper shielding cavity 12 is connected with bottom shielding outer cover 10 by screw; lower shielding cavity 13 is fixed by hasp and upper shielding cavity 12; upper test probe 14 is fixed on shielding cavity 12; lower position block can prevent rotary handle 1 unlimited toward backspin, relay testing probe.
Upper test probe 14 by concentric cable be fixed on the SMA type adapter 8 shielded on outer cover 10 and be connected, SMA type adapter 8 other end by concentric cable to be connected with testing tool vector network analyzer read signal bond impedance, certain prerequisite also needs testing tool to transmit to be connected with lower test probe 17 by concentric cable, lower test probe 17 is arranged on lower probe fixture 18, lower probe fixture 18 is located at bottom lower shielding cavity 13, lower metal crimp contact pin 16 is located on lower shielding cavity 13, the probe of lower test probe 17 will penetrate lower metal crimp contact pin 16, to contact with upper metal crimp contact pin 15 during test, electromagnetic shielding material is placed between metal crimp contact pin 15 and lower metal crimp contact pin 16, complete electrical test path is formed with this.Feet 19 is fixed with lower shielding cavity 13, forms a single unit system.
Fig. 2 is the actual detecting electric schematic diagram of radio-frequency (RF) impedance proving installation of electromagnetic shielding material provided by the invention, going up metal crimp contact pin 15 is as can see from Figure 2 fixed on plastics coupling shaft 11, and plastics coupling shaft 11 will penetrate shielding cavity 12, make to be connected with pressure transducer 9, will overlap to form Low ESR completely when upper shielding cavity 12 is tested with lower shielding cavity 13 and electrically overlap.During test, determinand electromagnetic shielding conductive materials conductive foam is placed in lower metal crimp contact pin 16, instrument is exported electric signal and is connected with lower test probe 17 by concentric cable, lower test probe 17 penetrates lower metal crimp contact pin 16, rotary handle 1 makes metal crimp contact pin 15 and lower test probe 17 and electromagnetic shielding conductive material, and make electromagnetic shielding conductive material produce displacement by pressure, produce the radio frequency bond impedance in electromagnetic shielding material and metal crimp contact pin with this.Want the complete resistance value that measures also to need test probe 14 to contact well with upper metal crimp contact pin 15, upper test probe 14 is connected with SMA type adapter 8, and SMA type adapter 8 is turned back to electric signal on testing tool by concentric cable.The bond impedance on electromagnetic shielding material and compressing piece just can be recorded by haveing suffered electric souffle testing tool behind path.
Upper and lower metal crimp sheet material can be selected according to the actual requirements, and lower metal crimp contact pin can be immersed in lower shielding cavity completely by internal notches, realizes low-resistance overlap joint.Upper and lower metal crimp sheet material generally uses copper, and selecting copper is that the radio-frequency (RF) impedance therefore now recorded is the bond impedance between electromagnetic shielding conductive material and print copper because most product casing selects when shield for EMI is copper.
Upper test probe 14 is placed on the position of shielding cavity 12 through emulation, the connection of 50 ohmages during to realize testing.Pressure transducer 9 by can accurately show the pressure be applied on electromagnetic shielding material after calibration, and coordinates with scale 2, monitors bond impedance in real time.
This device can use under the electromagnetic space environment of harshness, applicability is very good, and have employed the mistake proofing design of very hommization, make different personnel's misoperation also can not the damage of generating means internal components, when testing, in order to simulate the needs of actual design person, the material of crimping plate can be changed, to obtain the different radio frequency impedance that electromagnetic shielding material and different metal materials overlap, this device is also designed with scale simultaneously, pressure transducer, the overlap joint radio-frequency (RF) impedance value that energy Real-time Obtaining records, and the decrement obtained corresponding to design ideal resistance value, this decrement can easily read from scale.
Claims (10)
1. the radio-frequency (RF) impedance proving installation of an electromagnetic shielding material, it is characterized in that: comprise screw rod (3), screw rod (3) top is provided with rotary handle (1), screw rod (3) lower outside is provided with shielding outer cover (10), bearing (7) is fixed on screw rod (3) and goes up and be located at shielding outer cover (10) inner side, and pressure transducer (9) is connected on bearing (7);
Upper shielding cavity (12) is connected with shielding outer cover (10) bottom, lower shielding cavity (13) is fixed with upper shielding cavity (12), be provided with metal crimp contact pin (15) and lower metal crimp contact pin (16) in shielding cavity between upper and lower shielding cavity, upper metal crimp contact pin (15) is connected with pressure transducer (9) by plastics coupling shaft (11);
Electromagnetic shielding material to be tested is located between upper and lower metal crimp contact pin, be fixed on upper test probe (14) on shielding cavity (12) by cable be fixed on the adapter (8) shielded on outer cover (10) and be connected, adapter (8) other end is connected with the testing tool for reading radio-frequency (RF) impedance value by cable, testing tool is connected with lower test probe (17) by cable, and lower test probe (17) penetrates lower metal crimp contact pin (16) and contacts with upper metal crimp contact pin (15).
2. the radio-frequency (RF) impedance proving installation of a kind of electromagnetic shielding material as claimed in claim 1, is characterized in that: described screw rod (3) is provided with the scale (2) for observing displacement.
3. the radio-frequency (RF) impedance proving installation of a kind of electromagnetic shielding material as claimed in claim 1, is characterized in that: described screw rod (3) is provided with for preventing the unlimited lower position block toward backspin of described rotary handle (1).
4. the radio-frequency (RF) impedance proving installation of a kind of electromagnetic shielding material as claimed in claim 1, is characterized in that: be provided with the screw rod fixed block (5) for limiting screw rod (3) zone of action between described screw rod (3) and shielding outer cover (10).
5. the radio-frequency (RF) impedance proving installation of a kind of electromagnetic shielding material as claimed in claim 1, is characterized in that: described shielding outer cover (10) is provided with hand (6).
6. the radio-frequency (RF) impedance proving installation of a kind of electromagnetic shielding material as claimed in claim 1, is characterized in that: described lower shielding cavity (13) is fixed by hasp and upper shielding cavity (12).
7. the radio-frequency (RF) impedance proving installation of a kind of electromagnetic shielding material as claimed in claim 1, is characterized in that: the material of described upper and lower metal crimp contact pin is copper.
8. the radio-frequency (RF) impedance proving installation of a kind of electromagnetic shielding material as claimed in claim 1, it is characterized in that: described lower shielding cavity (13) bottom is provided with lower probe fixture (18), and described lower test probe (17) is located on lower probe fixture (18).
9. the radio-frequency (RF) impedance proving installation of a kind of electromagnetic shielding material as claimed in claim 1, is characterized in that: described plastics coupling shaft (11) is connected with described pressure transducer (9) through described upper shielding cavity (12).
10. the radio-frequency (RF) impedance proving installation of a kind of electromagnetic shielding material as claimed in claim 1, is characterized in that: described lower shielding cavity (13) bottom is provided with feet (19).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| 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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| 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 true CN104483553A (en) | 2015-04-01 |
| CN104483553B CN104483553B (en) | 2017-12-12 |
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Cited By (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 |
| CN109425787A (en) * | 2017-08-23 | 2019-03-05 | 中车株洲电力机车研究所有限公司 | A kind of radio frequency bond impedance measuring device and its production and measurement method |
| CN112147410A (en) * | 2020-09-15 | 2020-12-29 | 海宁利伊电子科技有限公司 | Multi-frequency point radio frequency impedance and current testing system |
| CN116819180A (en) * | 2023-08-30 | 2023-09-29 | 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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Cited By (5)
| 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 |
| CN109425787A (en) * | 2017-08-23 | 2019-03-05 | 中车株洲电力机车研究所有限公司 | A kind of radio frequency bond impedance measuring device and its production and measurement method |
| CN112147410A (en) * | 2020-09-15 | 2020-12-29 | 海宁利伊电子科技有限公司 | Multi-frequency point radio frequency impedance and current testing system |
| CN116819180A (en) * | 2023-08-30 | 2023-09-29 | 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) |
| 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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| CN104483553B (en) | 2017-12-12 |
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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. |