Experimental and numerical investigation of a magnetic resonator antenna based on the M-type hexaferrite (BaxSr1-xFe12O19).

In this work is reported an experimental and numerical investigation of magnetic resonator antennas (MRA) of magnetic the alloy Ba_xSr_1-xFe₁₂O₁₉ obtained in a new procedure in the solid-state method. The experimental and theoretical characteristics of the antenna like return loss, bandwidth, input impedance, and radiation patterns are in good agreement. Numerical validation is done, taking into account the air gaps between the dielectric resonator and the metallic conductors. Frequency response bandwidth in the range of 9–10% was obtained for frequency operation around 4 GHz. The alloys Ba_xSr_1-xFe₁₂O₁₉ showed a dielectric constant around 8, with loss in the range 10^-2–10^-3. The temperature coefficient of resonant frequency (τ_f) was also measured for magnetic alloys Ba_xSr_1-xFe₁₂O₁₉. The values obtained were in the range of 44.90–87.83 ppm/°C. These results obtained confirm the potential use of those materials for small dielectric MRA. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52: 452–458, 2010; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24931 [ABSTRACT FROM AUTHOR]