COMPACT TOP-LOADED ULTRA-WIDEBAND BICONICAL ANTENNA FOR INDOOR BASE-STATION APPLICATIONS

A biconical antenna employing the top-loaded technique is proposed for ultra-band (UWB) operation. The antenna is composed of a small cone mounted on a top-loaded disc and a conical ground plane, with both cones electrically connected together using four shorting pins to reduce the lower cutoff frequency. The antenna is investigated using computer simulation and measurement. Results show that the antenna has an impedance bandwidth from 0.8 Oils to over 11.2 GHz, dipole-like omnidirectional radiation pattern, average gain of about 4.2 dBi, and average radiation efficiency of over 88%. The antenna has the advantageous features of compact size, low profile, simple structure, and ultra-wideband characteristic and so is suitable for indoor base-station applications of many existing and future wireless and UWB systems. (C) 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2594-2598, 2010; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25540