See se bolela eng bakeng sa indasteri e potlakileng ea PCB?
Pele ho tsohle, ha o rala le ho aha mekotla ea PCB, lintlha tsa thepa li tlameha ho etelletsoa pele.Li-PCB tsa 5G li tlameha ho finyella lintlha tsohle ha li jara le ho amohela phetiso ea matšoao, ho fana ka likhokahano tsa motlakase, le ho fana ka taolo bakeng sa mesebetsi e itseng.Ntle le moo, liphephetso tsa moralo oa PCB li tla hloka ho rarolloa, joalo ka ho boloka botsitso ba matšoao ka lebelo le holimo, taolo ea mocheso, le mokhoa oa ho thibela tšitiso ea motlakase (EMI) lipakeng tsa data le liboto.
Letšoao le tsoakiloeng le amohelang moralo oa boto ea potoloho
Kajeno, litsamaiso tse ngata li sebetsana le 4G le 3G PCBs.Sena se bolela hore sebaka sa ho fetisa le ho amohela maqhubu a karolo ke 600 MHz ho 5.925 GHz, 'me kanale ea bandwidth ke 20 MHz, kapa 200 kHz bakeng sa litsamaiso tsa IoT.Ha o rala li-PCB bakeng sa litsamaiso tsa marang-rang tsa 5G, likarolo tsena li tla hloka maqhubu a millimeter wave a 28 GHz, 30 GHz kapa 77 GHz, ho latela ts'ebeliso.Bakeng sa liteishene tsa bandwidth, litsamaiso tsa 5G li tla sebetsa 100MHz ka tlase ho 6GHz le 400MHz kaholimo ho 6GHz.
Mabelo ana a phahameng le maqhubu a phahameng a tla hloka tšebeliso ea lisebelisoa tse loketseng ho PCB ho tšoara ka nako e le 'ngoe le ho fetisa matšoao a tlase le a holimo ntle le tahlehelo ea matšoao le EMI.Bothata bo bong ke hore lisebelisoa li tla ba bobebe, li nkehe habonolo, 'me li be nyane.Ka lebaka la boima bo thata, boholo le mathata a sebaka, lisebelisoa tsa PCB li tlameha ho fetoha habonolo le ho ba bobebe ho amohela lisebelisoa tsohle tsa microelectronic boto ea potoloho.
Bakeng sa mesaletsa ea koporo ea PCB, ho tlameha ho lateloe mesaletsa e mesesane le taolo e thata ea impedance.Ts'ebetso ea setso ea subtractive etching e sebelisetsoang li-PCB tsa 3G le 4G tsa lebelo le phahameng e ka fetoloa ts'ebetsong ea semi-additive e fetotsoeng.Ts'ebetso tsena tse ntlafalitsoeng tsa semi-additive li tla fana ka mesaletsa e nepahetseng le mabota a otlolohileng.
Thepa ea motheo e boetse e ntse e etsoa bocha.Likhamphani tsa boto ea potoloho tse hatisitsoeng li ithuta lisebelisoa tse nang le dielectric constant tse tlase joalo ka 3, hobane lisebelisoa tse tloaelehileng tsa li-PCB tse lebelo le tlase hangata ke 3.5 ho isa ho 5.5.Khalase e thata ea fiber braid, tahlehelo e tlase ea tahlehelo ea thepa le koporo ea boemo bo tlaase e tla boela e be khetho ea PCB e potlakileng bakeng sa matšoao a digital, kahoo e thibela tahlehelo ea matšoao le ho ntlafatsa botšepehi ba matšoao.
Bothata ba ho sireletsa EMI
EMI, crosstalk le parasitic capacitance ke mathata a ka sehloohong a liboto tsa potoloho.E le ho sebetsana le crosstalk le EMI ka lebaka la maqhubu a analog le digital ka boto, ho kgothaletswa ka matla ho arola mesaletsa.Tšebeliso ea liboto tsa multilayer e tla fana ka mekhoa e metle ea ho tseba hore na ho ka behoa litselana tsa lebelo le phahameng joang e le hore litsela tsa li-analog le lipontšo tsa ho khutla tsa digital li lule li le hōle, ha li ntse li boloka lipotoloho tsa AC le DC li arohane.Ho kenyelletsa ho sireletsa le ho sefa ha ho behoa likaroloana ho boetse ho lokela ho fokotsa palo ea EMI ea tlhaho ho PCB.
E le ho etsa bonnete ba hore ha ho na bofokoli le lipotoloho tse khutšoanyane tse tebileng kapa li-circuits tse bulehileng holim'a koporo, ho tla sebelisoa mokhoa o tsoetseng pele oa optical optical inspection system (AIO) o nang le mesebetsi e phahameng le 2D metrology ho hlahloba litsela tsa conductor le ho li lekanya.Theknoloji ena e tla thusa baetsi ba PCB ho batla likotsi tse ka bang teng tsa ho senyeha ha matšoao.
Mathata a tsamaiso ea mocheso
Lebelo le phahameng la pontšo le tla etsa hore hona joale ka PCB e hlahise mocheso o mongata.Lisebelisoa tsa PCB bakeng sa lisebelisoa tsa dielectric le likarolo tsa mantlha tsa substrate li tla hloka ho sebetsana ka mokhoa o lekaneng lebelo le phahameng le hlokoang ke theknoloji ea 5G.Haeba thepa e sa lekana, e ka baka mesaletsa ea koporo, ho ebola, ho honyela le ho putlama, hobane mathata ana a tla etsa hore PCB e senyehe.
E le ho sebetsana ka katleho le lithemparetjha tsena tse phahameng, bahlahisi ba tla hloka ho tsepamisa mohopolo tabeng ea khetho ea thepa e sebetsanang le conductivity ea mocheso le litaba tsa coefficient tsa mocheso.Lisebelisoa tse nang le conductivity e phahameng ea mocheso, phetisetso e babatsehang ea mocheso, le kamehla e tsitsitseng ea dielectric e tlameha ho sebelisoa ho etsa PCB e ntle ho fana ka likarolo tsohle tsa 5G tse hlokahalang bakeng sa kopo ena.