Evaluation of Transmission Characteristics of the Flexible Printed Circuit Board(FPC)
As electronic devices, such as mobile phones, use frequencies in the GHz range, there are calls for materials that have no effect on signal transmission. This is especially true with respect to the flexible printed circuit boards (FPCs), etc., used as circuit materials to transmit signals. Precisely measuring and evaluating high frequency characteristics (dielectric loss tangent, relative dielectric constant, transmission characteristics and characteristic impedance) is extremely important as even the slightest change has the potential to affect signal transmission.
In particular, scattering parameters (S Parameters) are an important factor to be measured in circuit boards. S parameters are elements that determine circuit characteristics according to the size and phase of incoming and outgoing transmission circuit voltage and can be measured in the MHz to GHz range using a vector network analyzer. Transmittivity (Transmissivity) characteristic |S21| shows output power, which can be used to evaluate the degree of transmission loss, etc., while reflection characteristic |S11| shows reflected power, which can be used to evaluate the size and influence of reflected waves. By measuring such S parameters it is possible to determine transmittable signal frequencies and evaluate changes in transmission loss.
Measuring overview, S parameters that can be evaluated and an evaluation example of transmission characteristics of FPC
Space Charge Evaluation
Using our proprietary space charge evaluation technology it is possible to observe the dispersion, transfer and accumulation of space charge (ion carriers) within polymer film in real-time.
In particular, the diffusion, movement, and accumulation of space charges (ion carriers) existing within polymer film can be observed in real time using a unique space charge evaluation technique.
Space charge observation overview and examples for adhesive tape space charge measurement