Study of a microwave ferrite resonator antenna, based on a ferrimagnetic composite (Gd ₃ Fe ₅ O ₁₂ )GdIG _<i>X</i> –(Y ₃ Fe ₅ O ₁₂ )YIG _{1− <i>X</i>}

Abstract

The authors report a study on microwave properties of a ferrimagnetic ceramic composite (Gd3Fe5O12)GdIGX–(Y3Fe5O12)YIG1−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 GdIGXYIG1−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 GdIGXYIG1−X could 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 τf, which indicates suitability for microwave applications such as mobile communication systems or satellite broadcast systems.