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January 4, 2017

I-EMI Shielding and Testing njengoba kuhlobene ne-Mobile Technology

RF Power Capacitors
ngo h080

I-EMI Shielding and Testing njengoba kuhlobene ne-Mobile Technology

Ingxenye yokuthi omakhalekhukhwini basebenza kanjani incike ekwehliseni ukuthikamezeka kazibuthe okungaba nomthelela ekucaceni kwezingcingo phakathi kwabasebenzisi. Lokhu kwenziwa ngezindlela ezihlukahlukene zokuvikela i-EMI ezingxenyeni ezenza ifoni isebenze, isikhwama sefoni esingaphandle, kanye nasezintini ezisetshenziselwa ukudlulisa isignali kunethiwekhi yonkana. Indlela i-electromagnetic shieding ekwenza ngayo lokhu kungokunciphisa indawo kazibuthe ezungeze izingxenye kanye nento ngokwayo ukuze kuthuthukiswe ukucaca uma isignali yamukelwa futhi idluliswa. Lokhu kuvikela kuhlobene nokuvikela kwe-RF nakho, okuvimbela amaza omsakazo ku-electromagnetic spectrum. Ngokuvamile ukuvikela kwe-EMI kwakhiwa ngezinto eziqhutshwayo kanye/noma kazibuthe futhi kusetshenziswe ezindaweni ezivalekile, izintambo, nezinye izindawo ezidinga ukuvikelwa ekuphazamisekeni.

Ukuvikela i-RF kuklanyelwe ukunciphisa ukuhlangana kwamaza omsakazo ngokuqondile, kuyilapho ukuvikela kwe-EMI kungasetshenziswa kulesi siqeshana kanye nalezo zihlangu ezisika izinkundla zikagesi kanye ne-electrostatic (indlela eyodwa eyenza lokhu ikheji ye-Faraday) futhi. I-static inducing evamile noma izinkundla kazibuthe ezivama kancane azivinjwanga yilezi zinhlobo zezihlangu nokho. Izinto ezimbalwa zihlobene ngqo nokuthi izihlangu zisebenza ngempumelelo kangakanani, okuhlanganisa uhlobo lwempahla, ukujiya kwempahla, ivolomu evikelekile, imvamisa yezinkambu, usayizi wezinkambu, kanye nokuma kanye nokuma kwezikhala eziyisivikelo esehlakalweni.

Okokuvikela i-EMI ye-antenna yeselula kungadalwa ngezinto eziningi, njengeshidi lensimbi, isikrini sensimbi, negwebu lensimbi. Usayizi wemeshi kusihlangu sesikrini kumele ube mncane bese ubude begagasi buvikelwe. Izinhlangothi zangaphakathi zamakesi epulasitiki adinga ukuvikelwa kwe-EMI zingagcotshwa ngoyinki wensimbi noma izinto ezifanayo ukuze kudalwe isivikelo esifanele ngokumelene nokuphazamiseka. Izinsimbi ezivame ukusetshenziswa kulokhu zihlanganisa ithusi ne-nickel. Amakhebuli avikelekile, njengoba umuntu angase athole njengamadivayisi kagesi, ngokuvamile anemeshi yocingo ezungeze ingqikithi yangaphakathi egcina isignali ukuthi ingaphumi ku-conductor futhi ivimbele imisebe yangaphandle ukuthi ithinte ikhwalithi yesiginali. Ukuvikela i-RF kusetshenziswa inani elibanzi lezinhlelo zokusebenza ezihlanganisa ukuvikela ama-RFID chips afakwe kumaphasipoti, ikhompuyutha namakhibhodi asetshenziswa amasosha, imishini yezokwelapha neyaselabhorethri, kanye nezindawo zokusakaza ze-AM, FM, ne-TV.

Ukuvikela kungasebenza ngezindlela ezimbalwa, ngokukhansela inkambu engaphakathi kuyo ngokukhokhiswa okuphikisayo, noma ngokudala inkambu ehlukahlukene ekhiqiza ama-eddy currents abonisa ukude kwemisebe. Izihlangu ze-RF zikhawulelwe ngenxa yokuthi isici esimelana nogesi sikakhondakta sivimbela ukukhanselwa ngokuphelele kwenkambu yengozi, impendulo ye-ferromagnetic kumaza aphansi ivimbela ukuncipha okugcwele, futhi izikhala noma izimbobo ezikhona ku-material zibangela ukugeleza kwamanje ngakuzo, ngaleyo ndlela. ukudala izimbobo kusihlangu ngokwaso kumafrikhwensi adinga ukuboniswa.

Izinhlobo ze-EMI ubuchwepheshe beselula okudingeka zivikelwe kuzo ziningi futhi ziyahlukahluka. Izingxenye zangaphakathi azidingi nje kuphela ukuvinjwa ukusuka kwenye, isistimu idinga ukuvikelwa kumasiginali angase aphazamise ukucaca kwamakholi acutshungulwayo. Ukuphazamiseka okuvela emisebeni yangaphandle kungabangela ukwehla okukhulu kwekhwalithi nokusebenza uhlelo lwamaselula olunikeza umthengi. Imithombo yalokhu ingavela kunoma yini ethwala imisinga kagesi eshintsha ngokushesha kuhlanganise nelanga ngokwalo.

Uma ubheka izinhlobo ze-EMI noma i-RFI evikelwe noma ehlolelwa umuntu kufanele aqaphele amafomu amabili ebonakala ngawo. I-Narrowband EMI ngokuvamile ivela emithonjeni yokudlulisa ngamabomu njengeziteshi zomsakazo ne-TV, ama-pager, omakhalekhukhwini, namadivayisi afanayo. Ukuphazamiseka kwebroadband kuhlobene nezikhithi zengozi ezifana nezintambo zamandla kagesi, amamotho, ama-thermostat, ama-bug zappers namanye amadivaysi anamaphethini okuvula/avaliwe ngokushesha. I-RFI eyi-broadband ingaba nzima kakhulu ukuyihluza uma isingene eketangoni lomamukeli.

Lapho izingxenye zangaphakathi zithinteka khona umuntu uzothola ukuthi amasekhethi ahlanganisiwe asebenzisa i-bypass of decoupling capacitor ukunciphisa i-EMI abangase bayidlulise Kungase futhi kube nokulawula isikhathi sokukhuphuka kwamasignali anesivinini esikhulu ngokusebenzisa izihlungi zochungechunge nokuhlunga kwe-Vcc. Lezi zisetshenziswa kuqala ngokuvikela kwangempela zisetshenziswa kuphela njengendlela yokugcina ngenxa yezindleko ezengeziwe isivikelo esinazo. Noma kunjalo singathola kalula izibonelo zemishini yedijithali eklanywe ngensimbi noma amakesi epulasitiki anama-conductive asebenza njengezihlangu ze-EMI. Ukuze uhlole imvelo esebenzayo yalabo baklami abavikelayo kudingeka bahlole ama-prototypes amasha wokungavikeleki kwe-RF ngaphakathi kwamagumbi ane-anechoic anemvelo ye-RF elawulwayo ukuze bathole ukufundwa okufanele kwekhono lamasekethe ahlanganisiwe okwenqaba i-RF.

Ukusetshenziswa Ukuvikela i-EMI kuyadingeka ukuze kuhlolwe futhi kuzuze ngokugcwele kubuchwepheshe beselula. Kunamanye amagama amaningi asetshenziswa kule nqubo ahlanganisa ukuhlolwa kwe-EMC/EMI, ukuhlolwa komkhawulokudonsa kanye nolwazi lwalokho ukuphazamiseka kwe-electromagnetic. Ukuba nolwazi oluphusile lwayo yonke le migomo kuzokuvumela ukuthi usebenzise isevisi yakho yeselula ngendlela engcono kakhulu.
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