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Cantor, Mater. , 40 (1998) 97–109. A. Legadevi1, A. , Samarium (Sm) and Dysprosium (Dy) showed the n-type semiconductor, was synthesized by sol- gel technique and sintered in a microwave furnace in order to enhance the electrical and magnetic behavior of this material as per the requirement of Microstrip patch antenna. The structural, surface morphological and chemical compositional properties of this material were investigated by X-ray diffraction (XRD), SEM and E-DAX. E-DAX was used for the quantification of elements (Mg, Dy, Sm and Fe) near the detection limit.

2 represents the relation between α parameter and Gd doping ratio at different sintering temperatures. The values at each curve of Fig. 1 are Gd doping % and non-linearity coefficient α. Clear from Figs. 1 and 2 that α is maximum (78) at 6% doping ratio and sintering temperature 1200oC. Moreover the leakage current Lg and the breakdown electric field Eo are improved at the low sintering temperature 1200oC as shown in Fig. 3. XRD spectra of the samples 94% ZnO - 6% Gd2O3 sintered at 1200oC, 1300oC and 1400oC are shown in Fig.

8). 03. and then start increases. It can be seen that anisotropy constant and initial permeability show an inverse trend with increase in Dy3+–Sm2+ doping concentration. This indicates that, the initial permeability is inversely proportional to magneto crystalline anisotropy constant, obeying μ3 α 1/K/ . DC Resistivity Studies: DC electrical resistivity is an important property for microstrip patch antenna design. Resistivity deceases with increasing the Dy3+– Sm2+ doping concentration according to Arrhenius equation [37].

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