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Magneto‐dielectric properties of the Y 3 Fe 5 O 12 and Gd 3 Fe 5 O 12 dielectric ferrite resonator antennas
Author(s) -
Fechine P. B. A.,
Moretzsohn R. S. T.,
Costa R. C. S.,
Derov J.,
Stewart J. W.,
Drehman A. J.,
Junqueira C.,
Sombra A. S. B.
Publication year - 2008
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.23824
Subject(s) - ferrite (magnet) , materials science , resonator , dielectric resonator antenna , dielectric , microwave , dielectric resonator , ferrite core , directivity , magnetic field , electrical engineering , optoelectronics , antenna (radio) , telecommunications , composite material , physics , engineering , quantum mechanics , electromagnetic coil
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