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A very low‐profile conical antenna with a simple structure and wideband characteristic is proposed in this article. The antenna structure consists of a monoconical conducting body, a parasitic ring shorted to a finite‐sized ground plate to achieve low‐profile characteristic (Nakano et al., IEEE Trans Antennas Propag 56 (2008) 1187‐1192), and a sleeve attached to the ground for yielding an extreme wide VSWR bandwidth. The experimental result shows that the proposed antenna, with a height of only 0.0625 wavelength at the lower edge frequency of the bandwidth, exhibits a 7.9:1 impedance bandwidth from 747 to 5900 MHz with VSWR below 2.5.
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Ma et al. (2009) studied this question.
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