1,Core txwv
Lub 77GHz wavelength tsuas yog hais txog 3.9mm, thiab PCB tau dhau los ua ib feem ntawm RF txuas. Hauv qab kab rau xaiv:
Dk kam rau ua Tsawg dua lossis sib npaug ± 0.02 ~ 0.05- ncaj qha hloov mus rau hauv kav hlau txais xov theem yuam kev, uas yog thawj qhov txwv;
Df Tsawg dua los yog sib npaug rau 0.0025 @ 77GHz (nyiam dua Tsawg dua lossis sib npaug rau 0.0015) - txiav txim siab qhov ntsuas qhov deb;
Z-axis CTE<50 ppm/° C - prevents through hole temperature cycling cracking;
Copper ntawv ci Rz<2 μ m (preferably VLP/HVLP) - skin depth is only 0.24 μ m, roughness directly affects wear and tear;
Impedance tswj ± 5%, nyiam dua ± 3%.
2, Cov nodes tseem ceeb hauv kev tsim khoom
Graphics: LDI ncaj qha sau + nqus etching, kab dav qhov tseeb ± 5 μ m;
Qhov: Backdrill kom tshem tawm cov seem seem (qhov tob tob ± 0.05mm), siv CO ₂ laser rau ntau txheej qhov muag tsis pom qhov;
Metalization: Lub zog saum npoo ntawm PTFE tsuas yog kwv yees li 18 dynes / cm ², thiab nws yuav tsum tau ua kom cov ntshav ua kom siab tshaj 52, nrog rau qhov pore tooj liab sib txuas ntawm ntau dua lossis sib npaug ntawm 1.5N / hli;
Kev kho deg: kub deposition ntawm 2-3 μ m, fluctuation ntawm ± 0.5 μ m;
Alignment: Interlayer offset Tsawg dua lossis sib npaug ± 25 μ m, impedance TDR tag nrho kev tshuaj xyuas.
3, Validation thiab Trends
Tsheb specification: -40 ↔ 125/150℃kub lub voj voog 1000 zaug, 85/85 humid cua sov 1000h; lub kaw lus yuav tsum tau IATF 16949 thiab ua raws li ISO 26262;
Localization: Plaub kauj ruam - Parameter Benchmarking → Me me Batch Verification (nrog ± 5% Impedance kam rau ua) → Compression Re Calibration → Xauv Batch kom ruaj khov;
Txoj Kev: Lub 4th txheej yog hloov mus rau 6th / 8th txheej, thiab cov zaus band hloov ntawm 77GHz mus rau 79GHz (nrog bandwidth ntawm 4GHz).