On the Absorption Mechanism of Ultra Thin Absorbers

被引：36

作者：

Kazemzadeh, Alireza ^{[1
]}

Karlsson, Anders ^{[1
]}

机构：

[1] Lund Univ, Elect & Informat Technol Dept, SE-22100 Lund, Sweden

来源：

IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION | 2010年 / 58卷 / 10期

基金：

瑞典研究理事会;

关键词：

Cavity resonators; frequency selective surfaces; microwave absorbers; radar cross section; DESIGN; SCREEN;

D O I：

10.1109/TAP.2010.2055779

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

Ultra thin absorbers are studied in detail to provide a comprehensive model for their absorption mechanism. It is shown that the transmission line (TML) approach is not able to model the absorber frequency response correctly. It results in large errors when the thickness to wavelength (d/lambda) ratio is below a certain level. It is explained that large amplitudes of high order Floquet modes and excitation of non-transverse component of the scattered field at the absorption frequency are the reasons for the TML model inaccuracy. It is illustrated that at small d/lambda ratios, the structure becomes a localized lossy resonator which exhibits absorption even in a finite size array configuration. For a resistive squared patch periodic array, the resonant frequency can be estimated fairly accurately by the cavity model of a single perfect conductor patch antenna.

引用

页码：3310 / 3315

页数：6

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