A printed miniature antenna for UWB applications

Miniaturised UWB antennas have attracted considerable research interests due to their applications in indoor localisation, Wireless Universal Serial Bus (WUSB), biomedical implant and Wireless Body Area Networks (WBANs) [1–3]. Various miniaturisation techniques have been therefore attempted in the design of small UWB antennas [4–7]. For example, a compact UWB antenna employing a half circular quasi-self-complementary structure along with a triangular cut on microstrip feedline has been proposed and investigated in [6]. It has achieved an ultra wide 10 dB impedance bandwidth of 2.86 GHz – 10.7 GHz with a rather small size, 25mm×16mm in physical dimension, corresponding to electrical dimension of 0.24λ. A Coplanar Waveguide (CPW)-Fed tapered slot UWB antenna for body-centric wireless communications has also been studied in [7]. This type of antenna features inseperable CPW and tapered radiating slot and has demonstrated an enormous return loss bandwidth with a compact physical size of 27mm×16mm and electrical size of 0.27λ, respectively.