Calculation of complex permeability and permittivity on Lanthanum barium manganite materials at X-band frequency

Abstract

The synthesis and electromagnetic wave absorbing characterization of La1−yBayMnO3 (y = 0−1, 0) magnetic material through a mechanical milling process have been performed. The La1−yBayMnO3 (y = 0−1, 0) magnetic material was made from La2O3, BaCO3, dan MnCO3 materials. The mix was milled for 10 hours and then sintered at 1000 oC for 10 hours. The results of the the hysteresis curve indicated that that La1−yBayMnO3 (y = 0−1, 0) samples are anti-ferromagnetic, and after a barium ion substituted system, this material undergoes a magnetic phase transformation becomes ferromagnetic. At y = 0, the characteristic impedance as a function of frequency is worth more than 2000 ohms, and when y = 0.2, Z characteristics began to change falls below 2000 ohms. Test results obtained by absorption of microwaves that have occurred absorption of electromagnetic waves in the frequency range between 9–15 GHz, frequency absorption peak is ∼ 7 dB at 14.4 GHz. At the peak frequency of the electromagnetic wave absorption were calculated magnitude reaches 50% with a thickness of 1.5 mm. We concluded that the La1−yBayMnO3 (y = 0−1,0) magnetic material has been made successfully and able to absorb a microwave in the frequency range 9–15 GHz.