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A novel compact coplanar stripline (CPS) fed antenna for ultra-wideband (UWB) application is investigated. The proposed antenna consists of a stair-case shaped radiator along with a shorted strip. The prototype is designed on a substrate of dielectric constant 4.4, with an overall dimension of 25mm x7mm x1.6mm. The antenna offers a 2:1 VSWR bandwidth from 3.1-11.4 GHz, with an average gain of 3dBi and average radiation efficiency of 75% throughout the band. Measured group delay and transmission characteristics show that the proposed antenna is a good candidate for UWB communication systems.

A compact planar ultra‐wideband (UWB) antenna for multiple‐input–multiple‐output /diversity applications is proposed in this study. The proposed antenna consists of three staircase‐shaped radiating elements, and is fabricated on a single 45 mm × 25 mm substrate of dielectric constant 4.3 and thickness 1.588 mm. It offers a 2:1 voltage standing wave ratio impedance matching in the entire UWB band, as specified by the Federal Communications Commission. Spatial, polarisation and pattern diversities within the antenna elements ensure an average isolation of 25 dB throughout the operating band. Moreover, the antennas have directional radiation patterns with stable gain and favourable radiation efficiencies. Good pattern diversity with better transient responses, low envelope correlation coefficient and ample mean effective gain within the UWB band, are the attractive features of this antenna.

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