Analysis of Stair-Like 3-D-Printed Layers for Suppression of Conduction Noise on Microstrip Line

Unwanted high-frequency electromagnetic interference from signal transmission lines or electromagnetic waves adversely affects the performance of electronic systems. Due to electromagnetic wave interference, filters and shields need to be designed to reduce noise and avoid damage to electronic devices. In this letter, 3-D printing is used to create stair-like layers on a microstrip line, which is utilized as a high-frequency power noise attenuator. Polylactic acid with added carbon is used in 3-D printing to prepare the conduction noise suppression layers. The effect of the stair-like 3-D-printed layers on power absorption, which enables high-frequency devices to function correctly, is discussed. The experimental results reveal that the power absorption range of the stair-like 3-D-printed layers is 80%–95% in the frequency range of 1.3–4.5 GHz for 1.21/3.23 mm specimens.