Abstract
In this paper, a FPC which has high flexibility and low insertion losses was investigated. We made several kinds of our original FPC which are constructed with Microstrip-Lines or Strip-Lines when changing various factors. These factors are the shape of the GND pattern, the width of the signal pattern, the thickness of the copper, and the thickness of the resin. We confirmed that the stability of the characteristic impedance and the S-parameter change form the shape of the GND pattern. An equilateral triangle GND pattern causes a circuit resonance. We concluded from the characteristic impedance and S-parameter data that a square is the best shape for the GND pattern and it is better to make the resin thicker and to extend the pattern width.
