Preparation method of gradient impedance thin film and product thereof

The invention discloses a preparation method of a gradient impedance film and a product thereof, and relates to the technical field of functional materials. The invention relates to a preparation method of a gradient impedance film, which comprises the following steps of: determining laser direct writing process parameters matched with different impedance values through a process test according to the material type of a film substrate; setting pattern distribution of impedance strips in the laser direct-writing processing system, and setting matched laser direct-writing process parameters in the laser direct-writing processing system according to different impedance values; the thin film substrate is placed on a processing platform of a laser direct writing processing system for laser direct writing, a plurality of impedance strips with different impedance values are prepared on the surface of the thin film substrate, and the gradient impedance thin film is formed. The gradient impedance effect is achieved by