Volume 77, Number 6, March 2007
|Number of page(s)
|Interdisciplinary Physics and Related Areas of Science and Technology
|07 March 2007
Design, fabrication and characteristic of two-layer microwave absorbers composed of magnetic micropowder-rubber composites in X-band frequency range
Department of Electronic Science and Technology, Huazhong University of Science and Technology, Wuhan 430074, PRC
Corresponding author: email@example.com
Accepted: 30 January 2007
Both experimentally and theoretically, a two-layer microwave absorber exhibits the possibility of meeting the demand for effective radar absorbing materials. The design methodology is based on the modulus of permittivity (permeability) which obeys a logarithmic law of mixtures, and the loss tangent is related through a linear law of mixtures. A linear regression analysis performed on the data points provides constants that can be used to predict the effective parameters at different frequencies, and a program is presented that computes the optimum amount of magnetic micropowder and the required thickness for each layer. A two-step sulfur treatment is then applied to preparation of the two-layer absorber, vulcanized firstly by heating at for 15 min and then at for 4 h. Finally, tensile strength is experimentally investigated as well as power reflection coefficient. Test results indicate the two-layer absorber has excellent mechanical and microwave attenuation properties for X-band frequency.
PACS: 81.05.-t – Specific materials: fabrication, treatment, testing, and analysis / 75.50.-y – Studies of specific magnetic materials / 07.05.Tp – Computer modeling and simulation
© Europhysics Letters Association, 2007
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