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A novel miniature antenna design for ultra-wideband (UWB) applications is presented. The proposed compact antenna is achieved by exploiting a quasi-self-complementary structure along with a tapered radiating slot. The optimal design of this type of antenna can offer an ultra-wide 10 dB impedance bandwidth with reasonable radiation properties. It also exhibits very small dimensions, 19 × 16 mm in physical size, and 0.19 λ in electrical size. Good agreement is obtained between simulated and measured antenna characteristics.
Introduction: Small and miniaturised UWB antennas are of great interest nowadays and in high demand for various applications such as Wireless Universal Serial Bus (WUSB), Wireless Body Area Network (WBAN), indoor localisation and biomedical implants [1-5]. Consequently, considerable research efforts have been made towards the miniaturisation of UWB antennas and various miniaturisation techniques have been thus tried to design compact UWB antennas [6-10]. For example, a small UWB antenna adopting a half circular quasiself- complementary structure together with a notch on the microstrip feedline has been proposed and studied [9]. It has demonstrated an ultra-wide 10 dB return loss bandwidth of 2.86-10.7 GHz with fairly compact dimensions, 25 × 16 mm in physical size, and 0.24 l in electrical size. A coplanar waveguide (CPW)-fed tapered slot UWB antenna for body-centric wireless communications has also been developed recently [10]. This type of antenna features an inseperable CPW and tapered radiating slot and has presented an enormous return loss bandwidth with a small physical size of 27 × 16 mm, corresponding to an electrical size of 0.27 l. By investigating the two above-mentioned compact UWB antenna designs, it is found that an even smaller size could be achieved by combining these two miniaturisation techniques.
In this Letter, a novel design of printed compact antenna is proposed and studied...