Study of a microwave ferrite resonator antenna, based on a ferrimagnetic composite (Gd3Fe5O12)GdIGX-(Y3Fe5O12)YIG1-X

The authors report a study on microwave properties of a ferrimagnetic ceramic composite (Gd₃Fe₅O₁₂)GdIG_x-(Y₃Fe₅O₁₂)YIG_1-x. The magnetic and dielectric measurements at microwave frequency were made through the Hakki-Coleman-s procedure and through the excitation of a cylindrical ferrite resonator antenna (FRA). The hysteresis loops of the GdIG_xYIG_1-x ferrimagnetic composite were obtained. The numerical simulation study was performed using Ansoft´s High Frequency Structure Simulator (HFSS´) software. The agreement between the experimental data and the simulated results is very good. These results demonstrated that, by varying the material composition of the resonator, ferrimagnetic composite GdIG_xYIG_1-xcould operate as a magneto-dielectric antenna with bandwidth in the range of 7.5-11- and in the frequency range of 4.4-5.3-GHz. Additionally, all FRAs presented a low negative value of tau _f, which indicates suitability for microwave applications such as mobile communication systems or satellite broadcast systems.