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Abstract
A wideband vertically polarised omni-directional antenna, which is characterised with a height of 0.1 λ L ( λ L: the wavelength at low frequency), a relative operating bandwidth of 48% (1.25-2.04 GHz), stable gains and improved cross-polarisation, is presented. A pair of λ /4 resonators is introduced to broaden the bandwidth; a symmetrical hook-shaped probe is employed to improve the cross-polarisation; the shorting pins between the patch radiator and ground plane are used to reduce the dimension of the antenna. To clarify the improved cross-polarisation, a comparison between the radiation patterns in asymmetrically and novel symmetrically feeding antennas is shown. Measured and simulated results agree well with each other, indicating good performance of wide bandwidth, low profile, stable radiation patterns and gains. Moreover, the polarisation purity of the proposed antenna has been significantly improved compared with that of the asymmetrically feeding antenna.
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