High-Frequency PCB tsim thiab sib dhos: Cov ntaub ntawv tseem ceeb

High-frequency printed circuit boards(PCBs) yog cov khoom tseem ceeb hauv ntau yam kev siv, suav nrog kev sib txuas lus, radar systems, kev sib txuas lus wireless, thiab kev ua cov ntaub ntawv ceev. Qhov kev ua tau zoo ntawm cov PCBs no hnyav heev los ntawm cov ntaub ntawv uas tau xaiv rau lawv cov qauv tsim thiab sib dhos. Kab lus no tshawb txog cov ntaub ntawv tseem ceeb uas siv hauv high-frequency PCB tsim thiab sib dhos, hais txog lawv cov yam ntxwv thiab qhov zoo.

• Cov ntaub ntawv hauv paus: Cov khoom siv hauv paus tsim lub hauv paus ntawm PCB ntau zaus thiab ua lub luag haujlwm tseem ceeb hauv kev txiav txim siab nws cov khoom hluav taws xob. Qee yam ntawm cov khoom siv hauv paus siv hauv high-frequency PCBs suav nrog:
• FR-4: Kev lag luam thiab siv dav siv epoxy cob fiberglass composite, FR-4 muab cov neeg kho tshuab zoo thiabthermal stability.Txawm li cas los xij, nwsdielectric tsis tu ncua(Dk) thiabdissipation factor(Df) tej zaum yuav tsis zoo rau cov ntawv thov ntau zaus.
• Rogers cov ntaub ntawv: Rogers muaj npe nrov rau nws cov khoom siv hluav taws xob ua haujlwm siab, xws li RT / Duroid. Cov ntaub ntawv no muaj qhov zoo tshaj plaws dielectric tsis tu ncua (Dk) thiab dissipation factor (Df) qhov tseem ceeb, ua rau lawv zoo rau kev siv PCB ntau zaus.
• Cov khoom siv taconic: Taconic muab ntau yam kev ua tau zoo ntawm cov khoom siv hluav taws xob, xws li PEEK (Polyether Ether Ketone) thiab polyimide, muab cov thermal stability zoo heev thiab tsis tshua muaj nqi Df, ua rau lawv zoo haum rau high-frequency circuits.

• Cov khoom siv hluav taws xob: Kev xaiv ntawm cov khoom siv hluav taws xob yog qhov tseem ceeb hauv kev tsim PCB ntau zaus raws li lawv txiav txim siab lub voj voog hluav taws xob, kev tiv thaiv, thiab teeb pom kev ncaj ncees. Qee cov ntaub ntawv siv hluav taws xob ntau hauv PCBs muaj xws li:
• Copper: tooj liab yog cov khoom siv dav siv ntau tshaj plaws vim nws qhov tshwj xeeb conductivity thiabkev ua tau zoo. Txawm li cas los xij, nws qhov kev tiv thaiv nce nrog zaus, yog li cov txheej tooj liab nyias tuaj yeem siv rau hauv cov ntawv thov ntau zaus.
• Kub: Kub tau lees paub rau nws qhov zoo tshaj plaws conductivity thiab tsis tshua muaj kev tiv thaiv, ua rau nws zoo haum rau high-frequency PCBs. Nws kuj muab qhov zoocorrosion kujthiab durability. Txawm li cas los xij, kub yog kim dua tooj liab, txwv nws siv hauv daim ntawv thov raug nqi.
• Aluminium: Aluminium yog ib qho kev xaiv tsawg dua rau cov PCBs ntau zaus tab sis tuaj yeem ua haujlwm hauv cov ntawv thov tshwj xeeb uas qhov hnyav thiab tus nqi yog qhov kev txhawj xeeb tseem ceeb. Nws cov conductivity qis dua tooj liab thiab kub, uas yuav tsum tau xav txog ntxiv hauv kev tsim.
• Cov khoom siv Dielectric: Cov ntaub ntawv dielectric yog qhov tseem ceeb rau kev thaiv cov kab hluav taws xob ntawm PCB thiab yog qhov tseem ceeb hauv kev txiav txim siab PCB cov khoom hluav taws xob. Qee yam ntawm cov khoom siv hluav taws xob sab saum toj siv hauv cov PCBs muaj xws li:
• Huab cua: Huab cua yog cov khoom siv dielectric tshaj plaws thiab xa cov hluav taws xob zoo heev ntawm cov zaus siab. Txawm li cas los xij, nws cov thermal stability yog txwv, thiab nws yuav tsis haum rau cov ntawv thov kub.
• Polyimide: Polyimide yog ibhigh-performance dielectric khoomrenowned rau nws tshwj xeeb thermal stability thiab tsawg Df qhov tseem ceeb. Nws yog nquag siv nyob rau hauv high-frequency PCBs uas yuav tsum tau tiv taus kub.
• Epoxy: Epoxy-based dielectric cov ntaub ntawv muab cov khoom siv zoo thiab thermal stability. Lawv feem ntau ua hauj lwm hauv FR-4 cov khoom siv hauv paus thiab muab hluav taws xob ua tau zoo mus txog rau qee zaus.

Kev xaiv ntawm cov ntaub ntawv rau high-frequency PCB tsim thiab sib dhos yog ib qho tseem ceeb rau kev ua tiav kev ua tau zoo. Cov khoom siv hauv paus, cov khoom siv hluav taws xob, thiab cov khoom siv hluav taws xob tag nrho ua lub luag haujlwm tseem ceeb hauv kev txiav txim siab PCB cov khoom hluav taws xob, teeb liab kev ncaj ncees, thiab kev ntseeg tau. Cov neeg tsim qauv yuav tsum ua tib zoo xaiv cov ntaub ntawv no raws li kev thov tshwj xeeb kom ntseeg tau tias kev ua tau zoo thiab kev ua haujlwm zoo. Raws li thev naus laus zis txuas ntxiv mus, cov ntaub ntawv tshiab thiab kev txhim kho hauv cov ntaub ntawv uas twb muaj lawm yuav tshwm sim ntxiv, ntxiv dag zog rau lub peev xwm ntawm PCBs siab.