CAI ZhongPing wrote:
>
> Dear experts,
>
> Thanks for your reply. I am sorry that I did not explain my question clearly.
>
> Here the flexible PCB has not a ground plane. The transmission line is made from only two parallel traces, just like twisted pair wire.
>
Is your pair of TLs edge-side or broadside coupled ?
Reference: "Transmission Line Design Handbook" / Brian C. Wadell
1)If broadside coupled: here that is called a "Paired Strips" construction.
Wadell, p.71
2)If edge-side coupled:
a) if width of strips is equal: "Coplanar Strips" / Wadell, p. 83
b) if width of strips is different: "Asymetrical Coplanar Strips" / Wadell,
p.85
For the "Paired Strip" construction I have a test coupon with 4 different widths
as check for the calculation.
CU :-)
Georg
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