Abstract

A wideband monoconical antenna with a null-filled radiation pattern for airborne applications is presented. A rotating current distribution, which radiates an electric field at the null point (<i>&theta;</i> &#x003D; <i>&phi;</i> &#x003D; 0&#x00B0;) of an omnidirectional radiation pattern of a conventional monoconical antenna, is formed using the proposed slotted structure in a monoconical radiator. In the proposed design, the null point is effectively filled over the 1:12 impedance-matched frequencies, while the size of the reference monoconical antenna is maintained. A figure of merit composed of the electric field intensity in the main radiation area (0&#x00B0; &#x2264; <i>&theta;</i> &#x2264; 45&#x00B0; and 0&#x00B0; &#x2264; <i>&phi;</i> &#x2264; 360&#x00B0;) and the profile of the antenna shows that the proposed antenna performs better than a conventional monoconical antenna or a fan-dipole antenna used in airborne applications. The impedance and radiation performances of the proposed antenna are verified experimentally from a 5.85:1 scaled built prototype.

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