Title :
Transmission line modeling (TLM) for evaluation of absorption in ferrite based multi layer microwave absorber
Author :
Meshram, R. ; Agrawal, Nawal K. ; Sinha, Bharoti ; Misra, P.S.
Author_Institution :
Dept. of Electron. & Comput. Eng., Indian Inst. of Technol., Roorkee, India
Abstract :
We present the development and design analysis of a multi layer microwave absorber. Three samples of M type hexagonal ferrite powders, namely [Ba(MnTi)δFe(12-2δ)O19] for δ = 1.6, 1.7 and 1.8, have been developed using the dry attrition and sintering process. On the basis of the transmission line model, the microwave absorption for a three layer microwave absorber with different combinations of ferrite for an overall coating thickness of 1.5 mm have been computed. It has been found that the three layer microwave absorber with each layer of different composition provides broad band characteristics with a minimum of 10 dB absorption from 12.5 to 18 GHz. This type of microwave absorber is very useful in military application for reducing the radar cross section of the target.
Keywords :
barium compounds; electromagnetic wave absorption; ferrite devices; ferrites; magnetic multilayers; manganese compounds; paints; titanium compounds; transmission line theory; 1.5 mm; 12.5 to 18 GHz; Ba(MnTi)1.6Fe8.8O19; Ba(MnTi)1.7Fe8.6O19; Ba(MnTi)1.8Fe8.4O19; broad band characteristics; dry attrition process; ferrite based paint; hexagonal ferrite powders; multi layer microwave absorber; sintering process; transmission line modeling; Composite materials; Dielectric materials; Electromagnetic wave absorption; Ferrites; Magnetic materials; Microwave technology; Permeability; Radar cross section; Surface impedance; Transmission lines;
Conference_Titel :
TENCON 2003. Conference on Convergent Technologies for the Asia-Pacific Region
Print_ISBN :
0-7803-8162-9
DOI :
10.1109/TENCON.2003.1273246
