Title :
Development of an EMI shielding ferrite: a case study
Author :
Chandran, R. Gopi ; Cursetji, Rm
Author_Institution :
Res. & Consultancy Directorate, The Assoc. Cement Companies Ltd., Thane, India
Abstract :
Ni-Zn EMI shielding spinel ferrite of the composition Ni0.30Zn0.60M0.10Fe2O4, where M=Cu, have been synthesized by the conventional ceramic route and the properties were tailored for its use in ribbon flat cables of digital equipments in the operating frequency range of 30-200 MHz. These highly dense soft ferrites were obtained by the incorporation of sintering aids such as Cu. The microstructure of the ferrite showed angular grains of size ∼20 μm and inter/intragranular porosity. The spinel ferrite was lossy in nature and had a Curie temperature of ∼170°C and possessed impedance of 23.3, 59.6 and 121.5 Ohms at 30, 100 and 200 MHz respectively.
Keywords :
Curie temperature; ceramics; copper compounds; electric impedance; electromagnetic shielding; ferrites; grain size; nickel compounds; porosity; sintering; zinc compounds; 30 to 200 MHz; Curie temperature; EMI shielding ferrite; Ni-Zn EMI shielding spinel ferrite; Ni0.30Zn0.60Cu0.10Fe2O4; Ni0.30Zn0.60M0.10Fe2O4; ceramic route; digital equipments; grain size; highly dense soft ferrites; impedance; intergranular porosity; intragranular porosity; microstructure; ribbon flat cables; sintering; Cables; Ceramics; Electromagnetic interference; Ferrites; Frequency synthesizers; Impedance; Iron; Microstructure; Temperature; Zinc;
Conference_Titel :
Electromagnetic Interference and Compatibility '99. Proceedings of the International Conference on
Print_ISBN :
81-900652-0-3
DOI :
10.1109/ICEMIC.1999.871666
