Microwave Absorber Design of Nanocomposites with electromagnetic parameters function

• Main Authors: Fan Kang-Hsien, 范綱賢
• Other Authors: Sze Jia-Yi
• Format: Others
• Language: zh-TW
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/59520296095970621699

碩士 === 國防大學中正理工學院 === 電子工程研究所 === 94 === In this thesis, a design method of single-layer planar absorbers constructed by a back metal plate and having good absorbing characteristics in radar operating bands is proposed. Moreover, to verify the feasibility of this method, several prototype absorbers consisted of nano materials were fabricated and their design progress was discussed. To find out the proposed design method, the formula describing the relationship between reflection coefficient, operating frequencies, electromagnetic and constructed parameters of the absorber is firstly obtained by theoretical calculation. Secondly, several absorber samples made of predetermined compound materials with different consistency were fabricated and their S-parameters were measured by free-space measurement. Based on these measured information, corresponding electromagnetic parameters versus frequencies were calculated. From these calculated results, an experimental function describing the relationship between electromagnetic parameters, material consistency, and frequencies can be found. Thus, the optimal choice of material consistency, operating frequencies and thickness of absorber can be predicted by simultaneously solving the abovementioned formula and experimental function with the aid of computer calculation. Finally, with several successful absorber designs made of different nano compound materials, it is proved that the design method can find application in different compound materials. Most important, this method can predict the better values of design parameters of absorbers before fabrication, which can result in a minimum waste of time and money.