Magneto-dielectric properties of the Y3Fe5O12 and Gd3Fe5O12 dielectric ferrite resonator antennas

✍ Scribed by P. B. A. Fechine; R. S. T. Moretzsohn; R. C. S. Costa; J. Derov; J. W. Stewart; A. J. Drehman; C. Junqueira; A. S. B. Sombra

• Publisher: John Wiley and Sons
• Year: 2008
• Tongue: English
• Weight: 329 KB
• Volume: 50
• Category: Article
• ISSN: 0895-2477
• DOI: 10.1002/mop.23824

✦ Synopsis

Abstract

The main objective of this work was to study the magnetic and dielectric properties of Y~3~Fe~5~O~12~ and Gd~3~Fe~5~O~12~ garnets resonator antennas obtained from a new procedure in the solid state ceramic technique. These ferrite resonator antennas (FRAs) had the ability to change their characteristics as a function of the applied magnetic field. The Y~3~Fe~5~O~12~ resonator was able to increase the antenna frequency range with application of external magnetic field. Some of the properties of dielectric resonator antennas (DRAs) can be actively controlled by using low‐loss ferrite materials. When unbiased, these ferrite resonator antennas (FRAs) exhibit similar behavior to DRAs. However, when a DC magnetic bias is applied, the tensor nature of the ferrite permeability is invoked, and various parameters can be controlled electronically. We also studied the magnetic behavior of the antennas and did a numerical study of the gain and directivity of the ferrite resonator antennas. These results can be important to develop wideband third‐generation (3G) cellular phones and other wireless products. © 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 50: 2852–2857, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.23824