Full-wave analysis microstrip resonator using magnetized ferrite

The studies on the magnetic tunability of microstrip linear resonator using bulk polycrystalline ferrite substrate have been experimentally and theoretically (full-wave analysis) demonstrated. To study magnetic tunability we have chosen the half-wavelength microstrip linear resonator designed at 2 GHz resonant frequency. A tunability of 370 MHz for above and below cutoff has been achieved for direction normal to substrate magnetization (field from 0 to 5000 Gauss). For the theoretical analysis of fabricated microstrip resonator spectral domain approach used from dispersion curves resonant frequencies have been computed for different values of applied field. Comparisons of experimental and theoretical results show good agreement. Approach used for analysis is general and can be extended to different classes of resonators.