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A Low-Profile Omnidirectional Antenna for WAIC System Application

In this paper, an omnidirectional antenna with low-profile characteristic is proposed for wireless communication in the cabin. The antenna can well operate in the band assigned for the Wireless Avionics Intra-Communications (WAIC) for wide signal-coverage inside the cabin. The antenna is evolved from a short monopole antenna but having a top-loading hemisphere and surrounded by folded spherical helices to achieve good impedance matching and symmetric radition patterns, as well as reduce the height of the antenna. Results show that the antenna owns a low-profile of only one seventh wavelength with satisfactory omnidirectional radiation patterns. Particularly, the antenna possesses the capability of resistance to the ground effect on omnidirectional radiation. The low-profile and omnidirectional radiation characteristic make the proposed antenna be a promising candidate for WAIC system applications.