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A Novel Broadband Modified Monopole by the Use of a Parasitic Conical Skirt

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3 Author(s)
C. A. B. Saunders Filho ; Center for Communications and Electronic Warfare of the Brazilian Army, Brasília, Brazil ; M. H. C. Dias ; J. C. A. Santos

Parasitic structures around a narrowband antenna may lead to significant bandwidth broadening. For instance, staircase metallic rings around a monopole antenna have been successfully used recently, yielding an impedance bandwidth increase by a factor of close to 10. In this letter, a conical metallic skirt is proposed as the parasite instead. The technique has been assessed with the aid of electromagnetic analysis software. A prototype for operation at the 1.5-4.5-GHz band was assembled and measured. The bandwidth increase is around 0.4 GHz greater than the one obtained with parasitic rings.

Published in:

IEEE Antennas and Wireless Propagation Letters  (Volume:11 )