Study On Electromagnetic Absorption Characteristics Of Planar Metamaterials

With increasingly requirements of military stealth techniques under severe electromagnetic (EM) pollution background, break through the limitation of traditional materials application in low frequency range, design and fabricate broadband microwave absorbing materials become one of the most important technology in the world. The main research contents in this thesis is metamaterials highly absorption characteristic research, and feasibility analysis of metamaterials applications in military stealth techniques.In this thesis we designed, simulated and finally realized "short and long wires" metamaterials structures with 100% perfect absorption property. Referred to "short and long wires" structure, we developed "short and long wires" numerical analysis model to analyze the relationship between geometry design and relative electromagnetic properties, so that we could interpret electromagnetic responses in "short and long wires"We mainly focused on researches of internal physical absorption mechanism metamaterials, in terms of information provided by simulation methods like S parameter and field distributions, we proposed two modes of metamaterials high absorption characteristics. Meanwhile, we also developed "planar reflection" model to make a deep understanding of absorption mechanism. Finally, we proved our hypothesis of highly absorption property: 1)Ohmic and dielectronic losses; 2)Interference.At the same time, we also researched on methods of preparing metamateirals samples and microwave measuring systems. We researched optical lithography process and laser marking technique, and realized these two ways for experiments; we developed free space measuring system to get S parameters, used NRL-arc method to investigate reflection property of metamaterials.