I placed an order for an FPCB last year (Product No. W965426AS1F3).
At that time, the base material was selected as polyimide flex.
I would like to know the permittivity and loss tangent (tan delta) of this dielectric material.
Additionally, if a datasheet for the polyimide material is available, I would appreciate it if you could provide it.
The frequencies of interest are 13.56 MHz and 9.2 MHz.