IOSR Journal of Electrical and Electronics Engineering (IOSR-JEEE) e-ISSN: 2278-1676,p-ISSN: 2320-3331, Volume 10, Issue 6 Ver. I (Nov – Dec. 2015), PP 35-43 www.iosrjournals.org DOI: 10.9790/1676-10613543 www.iosrjournals.org 35 | Page Design of Integrated LC Filter Using Multilayer Flexible Ferrite Sheets S. Coulibaly 1 , G. Loum 1 , K.A. Diby 2 1 Institut National Polytechnique, UMRI EEA (LARIT – SISE), Yamoussoukro, Ivory Coast 2 Université Félix Houphouët-Boigny, SSMT (LPMCT), Abidjan, Ivory Coast Abstract: Dielectric and magnetic materials were developed for use as integrated passive component design. The integrated LC component to be investigated in this paper uses ferrite material which combines both magnetic and dielectric properties. Because of this double property, the ferrite sheet will be used in this design as magnetic core for the inductor and dielectric substrate for the capacitor. The fabrication is simplified by using PCB inductor and adhesive flexible ferrite sheet. To evaluate the inductance, the capacitance including the parasitic resistance, a fabricated prototype of the LC component was simulated and measured. It was confirmed that simulated values were very close to the measured values and the integrated LC component behaves as low-pass filter. Keywords: Integrated passive, Flexible Ferrite, PCB Inductor, Multilayer Capacitor, L-C filter. I. Introduction In Power Electronic Converters such as DC-DC, output signal filter capacitor and inductor are relatively the largest components. They contribute to increase the size of the whole converter. Size reduction of these components is still a major challenge in low power converters where small and/or low profile systems are expected. Two ways are explored for those works. The first way is related to the switching frequency of the converter. If it is increased, capacitor and inductor can be reduced while keeping the same equivalent impedance. However, this working frequency has an upper limit imposed by the switching losses in the semiconductors and conductors. The second way of reducing the size is oriented toward new fabrication technologies which are to build integrated passive component structures (LC, LCL or LCT) to perform an electronic function (low-pass, resonant filter or transformer) [1], [2], [3]. This way gets more attention and has become the subject of research over the last few years. Both ways can be combined to reach high power-density converter when they are correctly used. The design of the integrated LC component in this paper is based on Ni-Zn flexible ferrite sheet used as magnetic core for PCB planar spiral inductor and as dielectric substrate for multilayer capacitor design because of the magnetic and dielectric properties of these materials. With the use of printed circuit board (PCB) windings, the cost of complex fabrication process is eliminated and also it offers the flexibility of winding geometry, shape, size. The specific permittivity and resistivity value of the Ni-Zn ferrite are 10 – 20 and more than 1MΩ·m respectively, with permeability of 125 – 2000 [4]. An integrated LC component using multilayer structure of materials is built. Commercially adhesive flexible ferrite sheets [5] are used to make design simplified and cost reduced. The resulting integrated LC component performances (cut-off frequency, input impedance and filter attenuation) will then be estimated in order to provide useful information to propose a final filter design having sufficiently good performances to be integrated in the same board of a switching converter. II. Structure Of The Integrated Lc Component The goal of this design is to explore the possibility of using ferrite material that has both magnetic and dielectric properties for integrating inductor and capacitor in multilayer structure which behaves as low-pass filter for switching power electronic converter output signal filtering. The construction of the integrated LC component is shown in Fig. 1. It is composed of spiral inductor sandwiched between two ferrite layers [6] and multilayer ferrite capacitor.