Dab tsi yog cov khoom siv tiv thaiv?
Shielding yog ib qho cuab yeej siv los thaiv kev thaiv lossis txo qhov kev sib kis ntawm hluav taws xob hluav taws xob, thiab yog ib qho tseem ceeb ntawm kev cuam tshuam electromagnetic cuam tshuam. Electromagnetic shielding feem ntau yuav muab faib ua peb hom: electrostatic shielding, magnetostatic shielding thiab high-frequency electromagnetic teb shielding. Lub hom phiaj ntawm peb hom kev tiv thaiv yog los tiv thaiv sab nraud electromagnetic teb los ntawm kev nkag mus rau qee qhov chaw uas yuav tsum tau tiv thaiv. Lub hauv paus ntsiab lus yog siv cov nyhuv ntawm shielding induction ntawm sab nraud teb los offset lub zog ntawm sab nraud teb. Txawm li cas los xij, vim muaj cov yam ntxwv sib txawv ntawm daim teb yuav tsum tau tiv thaiv, qhov yuav tsum tau ua rau cov khoom siv shielding thiab shielding nyhuv kuj txawv.
Cov ntaub ntawv sib txawv thiab cov khoom sib txawv thicknesses muaj qhov sib txawv ntawm qhov nqus ntawm electromagnetic tsis
Aluminium ntawv nyiaj Mylar: Aluminium ntawv nyiaj Mylar siv cov ntawv txhuas mos thiab polyester zaj duab xis ua cov ntaub ntawv raw, thiab yog sib xyaw los ntawm gravure txheej. Tom qab aluminium ntawv nyiaj Mylar yog matured, nws yog txiav thiab dov. Nws tuaj yeem tsim thiab nplaum, thiab cov ntawv txhuas txhuas Mylar tuaj yeem siv los sib sau ua ke tiv thaiv thiab hauv av tom qab txiav tuag. Aluminium foil Mylar daim kab xev yog tsuas yog siv nyob rau hauv kev cuam tshuam screen ntawm kev sib txuas lus cables. Aluminium ntawv nyiaj Mylar muaj xws li: ib leeg-sab txhuas ntawv ci, ob-sided aluminium ntawv ci, tis aluminium ntawv ci, kub-melt aluminium ntawv ci, aluminium ntawv ci daim kab xev, aluminium-yas composite daim kab xev; aluminium txheej muab kev ua tau zoo heev, kev tiv thaiv kev ua haujlwm thiab kev tiv thaiv corrosion tuaj yeem hloov mus rau ntau yam kev xav tau, kev tiv thaiv ntau yam yog 100K-3GHz, thiab tom qab ntawd cov kub-melt aluminium ntawv nyiaj Mylar yog coated nrog ib txheej ntawm cov nplaum kub yaj. nyob rau ntawm qhov chaw uas cov ntawv txhuas txhuas thiab cov kab sib txuas. Nyob rau hauv cov ntaub ntawv ntawm kub preheating, kub yaj nplaum nplaum yuav nruj nreem qhwv nrog lub cable core rwb thaiv tsev, uas yuav pab tau rau lub shielding kev ua tau zoo ntawm lub cable, thaum lub zoo tib yam aluminium ntawv ci tsis nplaum, nws tsuas yog qhwv ntawm lub cable core. rwb thaiv tsev, cable Lub shielding kev ua tau zoo tsis zoo.
Nta thiab daim ntawv thov teb:
Aluminium ntawv nyiaj Mylar feem ntau yog siv los tiv thaiv cov hluav taws xob hluav taws xob ntau zaus, tiv thaiv cov hluav taws xob hluav taws xob tsis zoo los ntawm kev tiv tauj cov neeg siv hluav taws xob ntawm cov cables, thiab tom qab ntawd tsim cov hluav taws xob cuam tshuam thiab nce crosstalk. Thaum lub high-frequency electromagnetic yoj kov lub txhuas ntawv ci, raws li Faraday txoj cai ntawm electromagnetic induction, lub electromagnetic yoj yuav nyiam mus rau saum npoo ntawm txhuas ntawv ci thiab tsim ib tug induced tam sim no. Nyob rau lub sijhawm no, tus neeg xyuas pib yuav tsum tau coj cov induced tam sim no mus rau hauv av, kom tsis txhob muaj qhov cuam tshuam tam sim no los ntawm kev cuam tshuam nrog lub teeb liab. Cov hlau uas siv aluminium ntawv ci raws li cov txheej thaiv thaiv feem ntau xav tau tias qhov rov ua dua ntawm cov ntawv txhuas yuav tsum tsis txhob qis dua 25 feem pua. Cov ntawv thov ntau tshaj plaws yog tam sim no nyob rau hauv kev sib txuas network. Hom kab hluav taws xob network no feem ntau yog siv hauv tsev kho mob, cov chaw tsim khoom thiab lwm qhov chaw uas muaj hluav taws xob hluav taws xob muaj zog lossis cov khoom siv hluav taws xob muaj zog ntau; Tsis tas li ntawd, nws kuj tseem siv rau hauv tsoomfwv thiab lwm qhov chaw uas muaj kev xav tau siab rau kev ruaj ntseg network.
Tooj / txhuas-magnesium kub hlau thiab lwm yam braided nets (hlau shielding): hlau shielding yog tsim los ntawm braiding hlau nyob rau hauv ib tug tej yam weaving qauv los ntawm braiding khoom. Cov ntaub thaiv npog feem ntau yog tooj liab xov hlau (tinned tooj liab xov hlau), aluminium alloy xov hlau, tooj liab-clad aluminium, tooj liab daim kab xev (tooj liab-yas daim kab xev), txhuas daim kab xev (aluminium-yas daim kab xev), steel daim kab xev thiab lwm yam ntaub ntawv, sib xws rau hlau braiding. , cov txheej txheem sib txawv muaj cov khoom tiv thaiv sib txawv, thiab kev tiv thaiv zoo ntawm cov txheej braided tsis tsuas yog txawv ntawm cov hlau nws tus kheej. Cov hluav taws xob conductivity thiab sib nqus permeability muaj feem xyuam rau cov txheej txheem tsis xws li, thiab cov txheej txheem ntau dua, qhov ntau dua qhov kev pab cuam, qhov me dua lub braiding lub kaum sab xis, qhov zoo dua qhov kev tiv thaiv ntawm cov txheej braiding, lub braiding lub kaum sab xis yuav tsum tau tswj ntawm {{4} } degree, rau ib txheej txheej weaving, qhov kev pab them nqi yog nyiam dua 80 feem pua, yog li nws tuaj yeem hloov mus rau hauv lub zog kub, lub zog muaj peev xwm thiab lwm yam ntawm lub zog los ntawm cov txheej txheem xws li hysteresis poob, dielectric poob, tsis kam poob, thiab lwm yam., siv lub zog tsis tsim nyog, thiab ua tiav kev tiv thaiv thiab nqus ntawm electromagnetic tsis cuam tshuam. Cov woven mesh feem ntau yog woven los ntawm tinned round tooj liab hlau los yog txhuas-magnesium kub hlau, feem ntau yog los tiv thaiv tsawg zaus electromagnetic yoj cuam tshuam, thiab nws txoj kev ua hauj lwm yog tib yam li txhuas ntawv ci. Lub shielded network cable siv braided mesh xav kom qhov ceev ntawm braided mesh feem ntau ntau dua 80 feem pua tsawg kawg. Hom braided mesh no tsuas yog siv nyob rau hauv qhov chaw uas muaj coob tus network cables tau nteg nyob rau hauv tib lub qhov, uas yuav txo tau cov sab nraud crosstalk generated ntawm ib tug loj tus naj npawb ntawm network cables. Tsis tas li ntawd, nws tseem tuaj yeem siv los tiv thaiv kev sib tw ntawm cov hlua hlau, txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau txhuam, nws, nws raug nquahu kom siv cov tshuaj tua kab.
Hom thiab daim ntawv thov tiam sis ntawm cable shielding cov ntaub ntawv
Muaj ob lub ntsiab ntawm cov khoom siv tiv thaiv cable. Ib qho yog tias peb feem ntau hu cov khoom siv nrog qee theem ntawm kev tiv thaiv kev ua tau zoo nyob rau hauv qee qhov kev tiv thaiv ib qho khoom siv polymer semi-conductive. Cov txheej txheem kev faib tawm yog lub hauv paus ntsiab lus ntawm cov khoom siv sab hauv. Cov khoom nws tus kheej muaj hluav taws xob conductivity yog hu ua hom qauv, thaum lub shielding cuam tshuam yog hu ua composite hom los ntawm txoj kev muab tub lim. Ob qho tib si cov qauv thiab cov khoom sib xyaw ib nrab ntawm cov khoom siv polymer yog cov ntaub ntawv tseem ceeb tshaj plaws uas siv rau hauv cov qauv cable. Qhov no yog vim tias cov khoom siv polymer semi-conductive tuaj yeem tsis tsuas yog tiv thaiv electromagnetic cuam tshuam, tab sis kuj muaj zog tiv thaiv lwm yam kev puas tsuaj ntuj. Tshwj xeeb, muaj peev xwm tiv thaiv xob laim tuaj yeem ua rau nws siv dav hauv cov ntawv thov tshwj xeeb xws li cov dav hlau cables. Cov txheej txheem tsim khoom ntawm cov khoom siv polymer semi-conductive yog qhov nyuaj thiab tus nqi kuj tseem siab. Yog li ntawd, cov khoom siv polymer semi-conductive xav tau cov nqi siab. Qhov thib ob hom yog hlau hlau weaving, uas feem ntau yog hais txog kev siv cov hlau hlau ua cov khoom tseem ceeb los tsim cov ntaub thaiv npog. Cable shielding khoom rau kev tiv thaiv kev sib nqus cuam tshuam. Hauv cov cables xws li HDMI2.1 thiab USB4 uas yuav tsum tau muaj kev tiv thaiv, cov hlau xaim siv rau cov khoom siv tiv thaiv braided feem ntau yog tinned tooj liab xov hlau. Txoj kev xaiv cov khoom no tsuas yog txhawm rau txhim kho kev tiv thaiv kev ua haujlwm ntawm cable. Nyob rau tib lub sijhawm, cables rau qhov sib txawv daim ntawv thov scenarios Tus tsim qauv weaving tus nqi ntawm cov hlau weaving siv kuj txawv. Feem ntau hais lus, cov nyhuv ntawm ntau txheej weaving yog zoo dua li ntawm ib txheej txheej, thiab qhov kev pab them nqi yog inversely proportional rau lub weaving lub kaum sab xis. Qhov ntawd yog hais tias, txhawm rau txhim kho qhov kev tiv thaiv kev ua tau zoo, peb yuav tsum txo qis lub kaum sab xis thiab ua kom cov cheeb tsam npog. Nyob rau hauv luv luv, daim ntawv thov zoo ntawm hlau shielding tuaj yeem ua lub luag haujlwm zoo hauv kev tiv thaiv electromagnetic cuam tshuam.
Tsawg-frequency cables account rau qhov feem ntau ntawm cov khoom siv cable. Yog tias cov cables ntawm ntau zaus ntsib ntau lub ntsiab lus hauv av, lub suab nrov tam sim no yuav raug tsim tawm, uas tsis yog qhov zoo rau kev cuam tshuam zoo ntawm tag nrho cov txheej thaiv thaiv. Yog tias txoj kev tiv thaiv ntawm ib qho taw tes hauv av yuav tsum tau saws, nws yuav tsum tau ua kom ntseeg tau tias tam sim no tuaj yeem raug tshem tawm ntawm nws tus kheej hauv cov txheej txheem tiv thaiv, thiaj li ua kom ntseeg tau tias qhov cuam tshuam tam sim no nyob twj ywm hauv cov txheej thaiv thaiv, yog li tsis txhob cuam tshuam electromagnetic. . Vim muaj kev cuam tshuam ntawm lwm txoj hauv kev hauv av ntawm cov khoom siv, cov txheej txheem tiv thaiv sab hauv ntawm qee cov cables feem ntau siv ob txoj hauv kev hauv av. Qhov no feem ntau yog vim hais tias ob-point grounding shielding txoj kev tuaj yeem xa tawm tam sim no rov qab los ntawm cov hlau nplaum hauv lub cable, yog li txo qhov tam sim no. Lub zog ntawm kev cuam tshuam. Stray capacitance feem ntau yuav tshwm sim nyob rau hauv high-frequency cables, uas cuam tshuam rau lub cev tam sim no kis tau tus mob nyob rau hauv high-frequency cables, thiab ib-point grounding thiab ob-point grounding txoj kev yuav daws tau qhov teeb meem no. Yog li ntawd, nyob rau hauv high-frequency cables txoj kev shielding ntawm multi-point grounding yuav tsum tau saws nyob rau hauv lub system. Nyob rau hauv high-frequency cables, qhov cuam tshuam tam sim no nyob rau hauv kab muaj ntau zaus thiab muaj cov yam ntxwv ntawm qhov chaw concentration, uas ncaj qha doubles nws cuam tshuam cov nyhuv thiab tsis conducive rau ib txwm ua hauj lwm ntawm tag nrho cov kab. Multi-point grounding txoj kev tuaj yeem txo qhov impedance nyob rau hauv lub shielding txheej, txo qhov cuam tshuam ntawm lub suab nrov tam sim no, yog li txhim kho tag nrho cov shielding nyhuv.
Cov txheej thaiv ntawm cov ntaub ntawv kab yog tsuas yog ua los ntawm cov ntaub ntawv tsis sib nqus xws li tooj liab thiab txhuas, feem ntau braided tooj liab mesh (aluminium-magnesium braided mesh) los yog tooj liab mooring (aluminium mooring, thiab lwm yam), thiab lawv thickness yog nyias nyias, ntau me dua li cov ntaub ntawv hlau ntawm qhov zaus ntawm kev siv. daim tawv nqaij tob. Ib lub ntsiab lus uas yuav tsum tau piav qhia yog qhov kawg ntawm nws yuav tsum tau txuas nrog lub teeb liab hauv av ntawm lub voj voog, vim tias cov nyhuv ntawm cov txheej thaiv thaiv tsis yog vim qhov kev xav thiab nqus ntawm cov hluav taws xob thiab cov hlau nplaum ntawm cov hlau. nws tus kheej, tab sis vim yog grounding ntawm shielding txheej. Cov ntawv sib txawv yuav cuam tshuam ncaj qha rau cov nyhuv thaiv. Txoj kev txhim kho yav tom ntej ntawm cov khoom siv hluav taws xob tiv thaiv hluav taws xob yuav yog los txhim kho cov kev taw qhia ntawm kev tiv thaiv kev tiv thaiv ntau dua, kev tiv thaiv ntau zaus, thiab kev ua haujlwm zoo dua. Txoj kev thov tshiab ntawm ntau yam ntaub ntawv tshiab hauv electromagnetic shielding yuav tau txais kev txhim kho ntxiv. Nyob rau hauv lub neej yav tom ntej technologies txoj kev loj hlob, electromagnetic shielding yuav tsim nyob rau hauv cov nqe lus ntawm zoo conductivity, yooj yim ua technology, siab nqi zog, thiab haum rau loj ntau lawm. Plaub yam yuav tsum tau txiav txim siab hauv kev xaiv yam khoom siv hluav taws xob tiv thaiv hluav taws xob siv li cas: kev tiv thaiv kev ua tau zoo, thiab seb puas muaj kev sib khi ib puag ncig, kev tsim qauv tsim nyog, cov nqi yuav tsum tau, raws li cov txheej txheem tuaj yeem muab faib ua hluav taws xob tiv thaiv hluav taws xob, tiv thaiv kev sib nqus. thiab electromagnetic teb shielding.
