Title :
Planar Annular Ring Antennas With Multilayer Self-Biased NiCo-Ferrite Films Loading
Author :
Yang, Guo-Min ; Xing, Xing ; Daigle, Andrew ; Obi, Ogheneyunume ; Liu, Ming ; Lou, Jing ; Stoute, S. ; Naishadham, Krishna ; Sun, Nian X.
Author_Institution :
Dept. of Electr. & Comput. Eng., Northeastern Univ., Boston, MA, USA
fDate :
3/1/2010 12:00:00 AM
Abstract :
With their high relative permeability, magneto-dielectric materials show great potential in antenna miniaturization. This paper presents an annular ring antenna with self-biased magnetic films loading in the gigahertz frequency range. The annular ring antenna was realized by cascading a microstrip ring and a tuning stub. Self-biased NiCo-ferrite films were adopted to load an annular ring antenna on a commercially available substrate that operates at 1.7 GHz. Novel antenna designs with self-biased NiCo-ferrite films on one side and both sides of the substrate were investigated. Antennas with self-biased magnetic films loading working at 1.7 GHz showed a down shift of 2-71 MHz of the central resonant frequency. An antenna gain enhancement of up to 0.8 dB was observed over the non-magnetic antenna.
Keywords :
dielectric materials; loop antennas; magnetic thin films; permeability; planar antennas; antenna gain enhancement; antenna miniaturization; magneto-dielectric materials; multilayer self-biased NiCo-ferrite films; planar annular ring antennas; relative permeability; self-biased magnetic films; Ferrites; Frequency; Loaded antennas; Magnetic fields; Magnetic films; Magnetic materials; Magnetic resonance; Nonhomogeneous media; Patch antennas; Permeability; Substrates; Annular ring antennas; antenna miniaturization; magnetic films; self-biased ferrite films;
Journal_Title :
Antennas and Propagation, IEEE Transactions on
DOI :
10.1109/TAP.2009.2039295
