Polypyrrole based microwave absorbers

被引:140
作者
Truong, VT [1 ]
Riddell, SZ [1 ]
Muscat, RF [1 ]
机构
[1] Aeronaut & Maritime Res Lab, Maritime Platforms Div, Melbourne, Vic 3001, Australia
关键词
D O I
10.1023/A:1004498705776
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Reflection of microwave radiations from single layer and two-layer materials is calculated. Microwave absorbing materials are formulated by mixing a commercially available paint or rubber with the conducting polypyrrole (PPy) powder. The reflection loss strongly depends on thickness and complex permittivity of the material. For a single layer material, optimum values of the real part, epsilon', and imaginary part, epsilon ", of the complex permittivity are found by calculations which lead to a minimum reflectivity at a given sample thickness. The ability to readily tailor the conductivity of the PPy powder enables the design of microwave absorbers according to theoretical desired values of epsilon' and epsilon ". A paint panel containing 2 wt % of PPy powder with a thickness of 2.5 mm exhibits a reflectivity < -10 dB (i.e. at least 90% absorption of the incident radiation) over 12 to 18 GHz. Blending and milling during the manufacturing process can destroy the original fibrous shape of PPy aggregates leading to low radiation absorption. In an attempt to achieve a broadband absorber, a two-layer system consisting of a first layer containing PPy powder and a second layer containing carbonyl iron has been fabricated. (C) 1998 Kluwer Academic Publishers.
引用
收藏
页码:4971 / 4976
页数:6
相关论文
共 15 条
[1]  
AMIET A, DEFERENCE SCI TECHNO
[2]  
Amin M. B., 1981, Radio and Electronic Engineer, V51, P209, DOI 10.1049/ree.1981.0032
[3]  
BIGG DM, 1986, METAL FILLED POLYM, P165
[4]   CONDUCTOMETRIC AND HIGH-FREQUENCY DIELECTRIC-PROPERTIES OF THE POLY(PHENYLACETYLENE) IODINE SYSTEM IN TETRAHYDROFURAN SOLUTIONS [J].
CAMETTI, C ;
FURLANI, A ;
IUCCI, G ;
RUSSO, MV .
SYNTHETIC METALS, 1992, 51 (1-3) :45-54
[5]   MICROWAVE PROPERTIES OF LOW-DENSITY POLYACETYLENE [J].
FELDBLUM, A ;
PARK, YW ;
HEEGER, AJ ;
MACDIARMID, AG ;
WNEK, G ;
KARASZ, F ;
CHIEN, JCW .
JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS, 1981, 19 (01) :173-179
[6]   PERMEABILITY AND PERMITTIVITY MEASUREMENT AND REFLECTIVITY CALCULATION FOR A MICROWAVE-ABSORBING COMPOSITE-MATERIAL CONTAINING A RESONATOR AND AN ELECTROMAGNETIC LOSS SUBSTANCE [J].
GAN, YX ;
WANG, FH ;
YIH, P ;
CHEN, CQ .
COMPOSITES, 1992, 23 (06) :435-439
[7]   INFLUENCE OF STRUCTURAL PARAMETERS OF CONDUCTING POLYMERS ON THEIR MICROWAVE PROPERTIES [J].
HOURQUEBIE, P ;
OLMEDO, L .
SYNTHETIC METALS, 1994, 65 (01) :19-26
[8]   THICKNESS CRITERION FOR SINGLE-LAYER RADAR ABSORBENTS [J].
KNOTT, EF .
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION, 1979, 27 (05) :698-701
[9]  
Lederer PG., 1986, 85016 ROYAL SIGN RAD
[10]   BROAD-BAND DIELECTRIC AND CONDUCTING PROPERTIES OF POLY(N-ALKYLANILINES) [J].
LIAN, AQ ;
BESNER, S ;
DAO, LH .
SYNTHETIC METALS, 1995, 74 (01) :21-27