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J Mater Sci: Mater Electron (2014) 25:560572 DOI 10.1007/s10854-013-1624-1
The behavior of high frequency tunable dielectric resonator antenna (DRA) with the addition of excess Fe2O3 in Y3Fe5O12 (YIG) formulation
Wan Fahmin Faiz Wan Ali Mohamadariff Othman
Mohd Fadzil Ain Norazharuddin Shah Abdullah
Zainal Arin Ahmad
Received: 9 September 2013 / Accepted: 14 November 2013 / Published online: 22 November 2013 Springer Science+Business Media New York 2013
Abstract This manuscript discusses the potential of yttrium iron garnet (YIG) with various amounts of Fe2O3
excess, as a tunable dielectric resonator antenna. The exploration of YIGs antenna microwave properties is a key to determine stability of the antenna radiation pattern and frequency shifting. YIG with various amounts of excess Fe2O3 is
prepared through a mixed oxide powder technique. Through X-ray diffraction analysis, it was found that addition of 5 wt% excess Fe2O3 to YIG stoichiometric formulation has depleted YIP phases in YIG ceramics. However, increasing amount of excess Fe2O3 in excess of 15 wt% led to increase in the Fe2O3 residue in YIG ceramics. The grains observed using high resolution electron microscopy displayed a well-packed structure. The size of the grains became bigger when the percentage of Fe2O3 increased to 20 % but accompanied with signicant changes in electrical properties. This change has led to a frequency shift from 14.14 to 17.32 GHz, which cover applications within the Ku-band (12.0018.00 GHz) together with radiation stability. These results imply that inclusion of excess Fe2O3 can be used for tunable DRA.
1 Introduction
High-performance antenna is regarded as one of the important devices to be used in latest communication
technologies. The trend of wireless devices is moving towards miniaturization so as to accommodate limited space and smaller designs. It is also capable of adjusting itself to unexpected change in frequency [1]. Thus, dielectric resonator antenna (DRA) has been an ideal candidate to improve the antenna performance in wireless technologies [2, 3]. DRA offers quite a lot of advantages which ranges from its portability, lightweight and exibility. The latter property of DRA makes it to be a better choice in the design of antenna over others such as microstrip antenna, wire antenna, reector antenna, aperture antenna [46].
Indeed, current DRA literatures are focused on compact designs to address portable wireless applications...