The Fabrication And Design Of Multi-layer Structure Absorbing Composite

Main work in this paper includes four parts. Firstly, the program according as transmission line theory is compiled to calculate the absorbing property of the material. Secondly, the single layer absorbing material is made and researched. Thirdly, the analogue circuit screen absorbing material is done and studied. Fourthly, the multi-layer material which has good absorbing property at 2-4GHz.is made. Main results include:1. The designs according as the program are viable. The calculating result is almost the same as the measuring result.2. The material whose thickness is 1.56mm included 3wt% CNTs filled filled with Co has -10dB at 6GHz. The material includes 70wt% CIP 5mm, 5wt% impure CNTs 1mm has -5dB at 2-4GHz, especially-10dB at 2 GHz. The material includes 70 wt%CIP 1.5m, 5wt% CNTs filled with Nd 0.5mm, 50wt% ferrite 2mm,has -5dB at 2-4GHz, -10dB at 10-18GHz.3. The analogue circuit screen which has holistic symmetry and locally abnormity has better absorbing property than the screen that is periodical.4. The analogue circuit screen using the electroless-nickel-plated carbon fiber has -2～-4dB at 2-8GHz.5. The main factor influences the absorbing property of the material is the effect of transmitted wave and reflected wave.