Mechanical and Electromagnetic Analysis of Flexible Fractal Interconnect Structures under High Frequency

Fractal flexible interconnect structure is an important aspect of flexible printed circuit and wearable electronics. However, with the scale reduction of flexible chip and the increase of working frequency for 5G communication technology, high frequency transmission characteristics of interconnects under mechanical deformation become an important influence factor to flexible devices. In this paper, ⊔-shape fractal structure is adopted for interconnect lines. Fractal structures with different fractal orders, and with different unit numbers at same length are simulated respectively. Then, electromagnetic characteristics of fractal flexible interconnects under bending and twisting are analyzed from 0.01GHz to 12GHz. Different fractal flexible interconnects are manufactured on Polyimide. Comparing with the straight states, variety of transmission lines in bending and twisting states are tested and analyzed.