Abstract

In this paper, a compact, mechanically rugged, DC grounded 45° slant polarized antenna having very low gain ripple in omnidirectional pattern is proposed. The antenna is based on the coaxial cylinder structures, which consists of oversize coaxial cylinders, slots and their feeding assembly and a matching unit. The slant polarization property is realized by four angular slots surrounding the axis of coaxial cylinder in the outer conductor. The antenna is dc ground which eliminates the electrostatic discharge ESD problems. Simulation results show that the antenna bandwidth is of 8.1% (2.56GHz to 2.78 GHz), gain variation in the horizontal plane is less than ±0.14 dB while the cross-polarization level is below 14dB over the whole bandwidth (2.56–2.78 GHz).

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