Abstract
In this article, a 3D top-loaded low profile sleeve antenna for unmanned aerial vehicle (UAV) applications is proposed. By loading a 3D disc cone structure on the top of a sleeve antenna, the overall height of the antenna can be significantly reduced compared with the height of a traditional quarter-wavelength monopole antenna. In addition, adding shorted columns between the top plate of the disc cone and the ground can generate a new resonant point at lower frequency, so that the frequency bandwidth can be effectively extended. Finally, in order to further achieve the miniaturization of the antenna, an annular slot ring structure was etched on the upper surface of the top plate. Under the conditions of $S_{11} , the designed antenna with a total size of $160mm\times 160mm\times 26.6mm\,\,(0.44\lambda \times 0.44\lambda \times 0.07\lambda)$ has a wide band covering from 840MHz to 1.69GHz (67.2%), while the height of the proposed antenna is only $0.07\lambda $ (where $\lambda $ is the wavelength of the lowest frequency point). Moreover, omnidirectional radiation performances through the operating band can be achieved for both the measured and simulated results.
Highlights
Unmanned aerial vehicles (UAVs) have attracted lots of attentions for scientific, industrial and military applications [1]
The antenna should be compact in size to satisfy the highly limited space in unmanned aerial vehicle (UAV), light weight to prolong the endurance of the whole UAV system, and low profile to minimize air resistance for aerodynamic requirements [2]
Antenna miniaturization can be realized, they were not designed for wide bandwidth applications, and the radiation efficiency changes according to the dielectric performance of the material, a carefully choose is essential
Summary
Unmanned aerial vehicles (UAVs) have attracted lots of attentions for scientific, industrial and military applications [1]. In [6], a Co2Z hexaferrite-glass composite was used as a helical antenna core, while in [7], conductive strip was helically wound on Co2Z hexaferrite substrate For both designs, antenna miniaturization can be realized, they were not designed for wide bandwidth applications, and the radiation efficiency changes according to the dielectric performance of the material, a carefully choose is essential. A super wide band monocone antenna is proposed in [15], by using dielectric loading, flexible impedance matching through wider bandwidth can be achieved. In [16], bent shorting strips together with parasitic and circular sleeves were used to minimize the conventional monocone antenna, a 147.3% fractional impedance bandwidth can be obtained with a low-profile.
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