Small and internal UWB chip antenna for mobile handset

Ultra-wideband (UWB) technique has become one of the most fascinating technologies with various antennas. It has the merits of high speed transmission rate, low power consumption and simple hardware configuration over conventional wireless communication systems. The research and development of the UWB systems including antennas have been widely performed [1-5]. Recently, UWB systems have focused on USB dongles and wireless USB for mobile handsets with development of mobile communications [6-7]. In order to transmit and receive UWB signals, antennas for various terminals of mobile handsets using UWB technique is required. However, previous UWB antennas for USB dongles or wireless USB for mobile handsets have large size or high height to be inserted in terminals of mobile handsets [6-8]. In this paper, we propose a small and internal UWB chip antenna for wireless USB of mobile handsets. Various coupling among radiators is used to achieve wide band characteristic and miniaturization of the proposed antenna. A tapered feed line and folded feed line is also used to obtain an enhanced impedance matching characteristic. After all, it has very compact size as all radiators are is 6.4 x 6 x 3 mm and the antenna clearance is 14 x 16 mm. The proposed antenna can cover ultra wide bandwidth of 3.1 ~ 10.2 GHz for VSWR less than 2. It also achieves good radiation and gain performance across the operating bandwidth. All simulations are in this work were carried out using CST Microwave Studio and a design example of the proposed antenna is demonstrated.