Trong dien thoai thong minh, thiet bi cay ghep y te va module ADAS, PCB linh hoat thuc hien cac ket noi tin hieu quan trong. Nhieu dien tu (EMI) khong duoc kiem soat co the lam hong tin hieu va gay ra loi he thong.
Ba phuong phap chan chinh
1. Lop dong
Mat phang dong dac: 60-80 dB, phuong phap duy nhat co kiem soat tro khang.
| Thong so | Dong dac | Dong cheo | Muc bac | Mang chan |
|---|---|---|---|---|
| Chan (dB) | 60-80 | 40-60 | 20-40 | 40-60 |
| Kiem soat tro khang | Co | Han che | Khong | Khong |
| Linh hoat | Thap | Trung binh | Tot | Xuat sac |
| Chi phi them | +40-60% | +30-45% | +20-35% | +15-30% |
2. Muc bac
Lop in lua 10-25 um, 20-40 dB.
3. Mang chan EMI
Cau truc ba lop, 10-20 um, 40-60 dB, 200.000-500.000+ chu ky uon.
"Lua chon phuong phap chan anh huong den ban kinh uon, tro khang, do day va chi phi — phai la mot phan cua dac ta thiet ke ban dau."
— Hommer Zhao, Giam doc Ky thuat, FlexiPCB
Quy tac thiet ke
- Xac dinh yeu cau truoc khi thiet ke stack-up
- Tinh ban kinh uon bao gom chan (Tinh: 6x, Dong: 12-15x)
- Khoang cach via < lambda/20
- Lien tuc tai chuyen tiep rigid-flex
- Su dung may tinh tro khang
Ung dung
- Dien tu tieu dung — Mang, 30-40 dB. Xem huong dan wearable.
- Y te — Dong cho cay ghep. Xem huong dan y te.
- O to — Radar 77 GHz. Xem kiem tra do tin cay.
- Hang khong — MIL-STD-461. Xem huong dan da lop.
Chi phi (2 lop, 100x50mm, 1000 cai)
| Khong chan | Mang | Muc | Dong | |
|---|---|---|---|---|
| Tong | $3,20 | $3,95 | $4,35 | $5,40 |
Yeu cau bao gia hoac lien he de duoc xem xet DFM mien phi.
Cau hoi thuong gap
Phuong phap tot nhat cho PCB flex?
Tuy thuoc yeu cau. Dong: bao ve toi da. Mang: can bang tot nhat.
Tai lieu tham khao
Thẻ:
EMI shielding
flex PCB shielding
electromagnetic interference
shielding film
copper shielding
silver ink shielding
RF shielding
