Abstract
The design of a novel low proflle antenna is presented in this paper. By a cross-shaped structure shorted to the ground plane through shorting probes, the size reduction is achieved. A top-loading ring-disc is successfully employed to broaden the impedance bandwidth. Moreover, with the uniformly-arranged shorting pins and a circular sleeve structure placed on the ground, a good omnidirectional performance in the horizontal plane is obtained. An antenna prototype has been implemented and characterized. A measured impedance bandwidth for VSWR • 2 of about 135% ranging from 1500 to 7800MHz is achieved, and a monopole-like radiation pattern is also produced. The height of the proposed antenna is very low with 0:07‚ tall. The proposed antenna is very suitable for indoor base station and the UWB applications.
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