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Planar Annular Ring Antennas With Multilayer Self-Biased NiCo-Ferrite Films Loading

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9 Author(s)
Guo-Min Yang ; Dept. of Electr. & Comput. Eng., Northeastern Univ., Boston, MA, USA ; Xing, Xing ; Daigle, Andrew ; Obi, O.
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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.

Published in:

Antennas and Propagation, IEEE Transactions on  (Volume:58 ,  Issue: 3 )