Yuav ua li cas Aluminium Foil Shields Electronic Cheebtsam
Aluminium foil shields los ntawm kev xav thiab nqus. Ib qho kev cuam tshuam kev cuam tshuam ntawm lub suab nrov thiab qhov hluav taws xob rhiab cuam tshuam feem ntau qhov xwm txheej electromagnetic zog ntawm qhov chaw, thiab qhov seem me me yog attenuated thaum nws dhau los ntawm cov ntawv ci. Rau kev thaiv kev ua haujlwm, cov ntawv ci yuav tsum yog hluav taws xob txuas ntxiv thiab txuas nrog hauv av lossis rau lub chassis siv dav hlau; ib daim ntawv uas tsis muaj av tsuas yog ib feem ntawm daim thaiv thiab tuaj yeem ua ob peb lub suab nrov rau hauv ib puag ncig.
Rau kev sib dhos ua haujlwm hauv hluav taws xob, 1xxx-series cov ntawv muag muag (piv txwv li 1235, 1145, thiab 1100) hauv cov tuab ntawm 0.008 txog 0.05 hli yog qhov raug. Lub O lossis annealed temper ua rau cov ntawv ci hloov tau txaus los qhwv ib ncig ntawm cov cables, cov khoom sib txuas, thiab cov duab tsis sib xws, thiab qhov siab -purity nto oxidizes mus rau qhov ruaj khov, tsis yog -cov yeeb yaj kiab uas tiv thaiv tsis xav tau luv luv.
Kev Tiv Thaiv Kev Cia Siab
Nrog rau kev kho av thiab seam kom raug, aluminium ntawv ci hauv 0.01-0.05 hli feem ntau muab 60-100 dB ntawm attenuation los ntawm 30 MHz mus txog 1 GHz, uas suav nrog feem ntau cov teeb meem ua thiab hluav taws xob emissions hauv kev lag luam thiab cov khoom siv hluav taws xob. Saum toj no 1 GHz cov nyhuv ntawm daim tawv nqaij txo qhov kev nkag mus ntawm lub teb, yog li kev ua tau zoo poob raws li qhov zaus nce; saum toj no 10 GHz ib txheej nyias nyias feem ntau tsis txaus thiab cov ntawv tuab tuab, hlau mesh, lossis coated conductive films tau teev tseg.
Installation Cov kev coj ua zoo tshaj plaws
Seams thiab overlaps yog qhov uas thaiv tsis tau. Sib tshooj ntawm cov ntawv ci los ntawm yam tsawg kawg 25-30 hli thiab sib koom ua ke nrog cov ntaub nplaum nplaum kom tsis txhob muaj qhov sib txawv ntawm huab cua. Rau cable shielding, siv kauv wrapping nrog kwv yees li 50% sib tshooj ntawm lub kaum sab xis ntawm 45-55 degrees, uas muab ob npaug - txheej thaiv raws kab axis. Ntawm cov ntsiab lus hauv av, siv cov nplaum nplaum uas ua rau 360-degree kev sib cuag nyob ib ncig ntawm lub pluaj, thiab qhov chaw uas cov ntawv ci ua tau raws li cov xim pleev xim los yog anodized chassis, siv lub hnub qub ntxhua khaub ncaws lossis cov khoom siv tus kheej tapping uas tom los ntawm txheej oxide kom ncav cuag hlau liab qab. Nyob rau hauv vibrating ib puag ncig xws li tsheb, ntawv ci-laminated polyester composites yog nyiam vim lub laminate tiv taus qaug zog tawg ntawm lub folds.
Ib puag ncig, siab -Frequency, thiab 5G kev txiav txim siab
Aluminium ntawv ci khaws nws cov khoom tiv thaiv nyob rau hauv ib txwm siv hluav taws xob ua haujlwm ntawm li -40C txog +150C. Tshaj li kwv yees li 150C, oxide kev loj hlob nrawm thiab tiv thaiv kev sib cuag ntawm cov pob qij txha nce, uas tuaj yeem degrade shielding efficiency los ntawm 10-15% nyob rau hauv ntev- raug. High-purity 1xxx foils yog nyiam nyob rau hauv xws li daim ntaub ntawv vim hais tias lawv ntom, uniform oxide muab tus cwj pwm zoo tshaj plaws. Nyob rau hauv qhov chaw ntub dej, ntawv ci feem ntau ruaj khov, tsis zoo li qee cov ntaub qhwv uas nws cov fiber ntau degrade nrog cov dej noo. Rau cov huab cua corrosive, qhia cov txheej txheem corrosion-resistant los yog cov nickel-plated conductive txheej es tsis yog ntawv ci.
Kev soj ntsuam kev tiv thaiv kev ua tau zoo: tus qauv kuaj txoj hauv kev rau cov ntaub ntawv tiaj tus yog ASTM D4935, uas siv cov coaxial kis tau tus mob -kab fixture los ntsuas kev tiv thaiv kev ua tau zoo ntawm cov nplooj ntawv planar hla ib pawg zaus. Rau kev sib sau ua ke, IEEE 299 piav qhia txog chav tsev -raws li kev ntsuas kev tiv thaiv kev ua tau zoo ntawm cov chav ua tiav thiab cov thawv. Hauv kev tsim khoom, nyob ze - cov kev sojntsuam tuaj yeem nrhiav cov ntsiab lus xau nrog sub- millimeter daws teeb meem, thiab lub sijhawm-domain reflectometry txheeb xyuas impedance discontinuities hauv shielded cable los ua ke. Thov ntsuas cov ntaub ntawv los ntawm cov txheej txheem no thaum tiv thaiv kev ua tau zoo yog qhov kev cog lus yuav tsum tau ua.
Rau cov ntawv thov saum toj no 1 GHz, ntau txoj cai siv: khaws txhua lub seam luv thiab sib txuas, hauv av ntawm ntau lub ntsiab lus kom tsis txhob muaj kab noj hniav, thiab suav rau cov nyhuv ntawm daim tawv nqaij los ntawm kev xaiv cov ntawv ci nyias uas tseem ua tau raws li lub hom phiaj attenuation ntawm qhov txaus siab tshaj plaws. Anodized los yog pleev xim rau ntawm qhov chaw yuav tsum tau npog los yog abraded ntawm cov ntsiab lus sib cuag, vim hais tias cov insulating oxide txheej nce kev tiv thaiv ntawm RF pob qij txha. Qhov twg xav tau kev tswj xyuas thermal thiab kev tiv thaiv, ntawv ci - cov ntaub ntawv laminated nrog thermally conductive adhesives muab ob qho tib si ua haujlwm hauv ib txheej.
Cov lus nug nquag
Puas yog txhuas ntawv ci thaiv EMI nrog rau cov hlau thaiv?Rau cov zaus hauv qab no txog 1 GHz, cov ntawv ci hauv av kom zoo ua tiav qhov txo qis piv rau nyias - ntsuas cov hlau enclosures, thiab nws yooj yim dua rau siv rau cables thiab cov rooj sib txoos uas twb muaj lawm. Rigid enclosures tseem yeej qhov twg muaj kev tiv thaiv txhua yam, thermal paths, thiab siab heev - yuav tsum muaj kev ua haujlwm zaus.
Vim li cas cov ntawv ci yuav tsum tau grounded?Grounding muab reflected thiab absorbed zog ib txoj kev rov qab mus rau qhov chaw. Yog tsis muaj qhov qis -impedance hauv av daim ntawv cog lus, cov ntawv ci ua haujlwm raws li tus neeg xyuas pib ntab uas tuaj yeem rov ua suab nrov thiab tuaj yeem ua suab nrov ntawm qee zaus, ua rau emissions zuj zus.
Cov ntawv ci tuaj yeem tiv taus qhov kub thiab txias?Standard aluminium foil ciaj sia luv luv reflow raug, tab sis cov oxide zaj duab xis thiab tsawg melting point (kwv yees li 660C rau ntshiab txhuas) txwv nws siv nyob ze cov pob qij txha. Khaws cov ntawv ci kom tsis txhob muaj hluav taws xob ncaj qha, kub -bar soldering, thiab cov khoom uas khiav saum 150C tsis tu ncua.
Qhov twg aluminium foil qib yog qhov zoo tshaj rau kev tiv thaiv?High-purity 1xxx foils xws li 1235, 1145, thiab 1100 yog qhov kev xaiv niaj hnub vim yog kev coj ua, softness, thiab cov oxide tsis zoo. Alloy 8011 yog tus nqi qis dua - lwm txoj hauv kev uas cov kev xav tau ductility yog nruab nrab.
Cov ntawv ci yuav tsum tuab npaum li cas rau 2-5 GHz daim ntawv thov?Daim tawv nqaij tob hauv txhuas ntawm 2 GHz yog kwv yees li 2 microns, yog li cov ntawv ci tuab (8 microns lossis ntau dua) tshaj li ob peb daim tawv nqaij tob. Qhov kev txwv ntawm qhov siab zaus tsis yog ntawv ci thickness tab sis seam kev ncaj ncees, grounding, thiab qhov loj ntawm apertures; hais cov thawj.
Puas yog aluminium foil shielding kuaj tiv thaiv cov qauv tsim?Yog lawm. ASTM D4935 npog coaxial- ntsuas qhov ntsuas ntawm cov ntaub thaiv npog cov ntaub ntawv, thiab IEEE 299 npog tiv thaiv kev ua haujlwm ntawm cov ntaub thaiv npog. Ntau qhov kev qhia tshwj xeeb OEM siv cov qauv no ntxiv rau kev ntsuas ib puag ncig xws li tshuaj tsuag ntsev rau cov khoom siv hauv hiav txwv.
