Abstract
A coated conical antenna capable of wideband or dual band operation is here proposed and experimented. The antenna is intended for vehicular applications, where robustness and height reduction are a premium. Dielectric and magnetic coating of the radiating cone allows a two octave band operation, but only moderate size reduction. A more compact conical antenna, capable of dual-band operation, can be implemented at the expense of little reduction of radiation efficiency and gain by introducing distributed capacitive loading, a grounding strip and a proper matching network. The design procedure of the isolated antenna was essentially based on an analytical method, while the radiation behavior of the device mounted over a car roof was analyzed using a full-wave numerical approach based on the method of moments.
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