CAJ | 학술논문

微米级粉体吸收剂性能指标已经达到理论极限，纳米结构金属薄膜由于具有更高的磁导率有望成为一种新型的微波吸收材料，但目前受限于界面匹配性能，必须控制其介电常数使其适合界面匹配。本文主要讨论金属薄膜的介电机制以及对其介电常数调控的可能性。基于重整化有效媒质理论的计算结果表明，可以通过相应技术途径使连续金属膜变成不连续，并控制不连续金属膜单元尺寸，当单元尺寸处于微米量级范围内时，金属膜的有效介电常数可以降到微波可匹配范围内。
미미급분체흡수제성능지표이경체도이론겁한，납미결구금속박막유우구유경고적자도솔유망성위일충신형적미파흡수재료，단목전수한우계면필배성능，필수공제기개전상수사기괄합계면필배。본문주요토론금속박막적개전궤제이급대기개전상수조공적가능성。기우중정화유효매질이론적계산결과표명，가이통과상응기술도경사련속금속막변성불련속，병공제불련속금속막단원척촌，당단원척촌처우미미량급범위내시，금속막적유효개전상수가이강도미파가필배범위내。
The microwave properties of the micron absorbent have reached the theoretical limit,for its three dimension structer and have no further promotion spaces.Meanwhile,too high planar density also limits its applications in more filed, e.g.all kinds of aircraft.The metal film has a two dimension structure with magnetic moments lying on the plane.And the nano-structure of films also benefits higher microwave permeability.The permeability of magnetic films usually is above 100 at 2GHz,which could give excellent microwave properties with very low thickness and planar density,and the film has a potential to be the excellent microwave absorption material.The metal film usually has the good conductivity,which leads to the high microwave reflection and the bad interfacial microwave match.The complex permittivity of the metal film must been controlled to be suitable for the interfacial microwave match,so that the incident microwave could be easy to penetrate into films and be transformed into heat.Patterned films possess the discontinuous structure and could be regarded as the effective medium composed of metal and air.Low permittivity of metal films could be achieved by this way.The dielectric mechanism of patterned metal films,and how to manipulate it,are discussed in the paper.The calculation work has been conducted based on re-generalized effective medium theory.The results indicate patterned films with cell size in the micron range could suppress the effect of eddy current,and reduce the permittivity of films below 1000.The permittivity of patterned films combined their high permeability would give a perfect interfacial match property for the microwave absorption application.Based on the calculation result,a new type film microwave absorption material will be realized.The further preparation process should be tried to tailor the metal film.