Wearable printed monopole antenna for UWB and ISM applications

Summary form only given. A great deal of attention has been focused recently towards the development and optimization of Ultra Wide Band (UWB) wireless systems due to their outstanding features which include: low power requirement, configuration simplicity, and very high data rate. This technology can be deployed in a wide spectrum of fields such as: medical devices, entertainment and multimedia connectivity, and personal communication. For most modern consumer devices, WiFi connectivity is required. Hence, the antenna is required to have an omnidirectional radiation characteristics. A printed monopole antennas would serve as a good candidate for such systems due to its compactness, high efficiency, simple fabrication process, and cost effectiveness. Moreover, the emerging wearable electronics technology require low profile, light weight and compact antennas.A flexible, compact and low profile antenna printed on a 50.8-m Kapton polyimide Substrate is proposed in this paper. The half-eliptical based radiating element gives rise to the UWB behavior (3.1 - 10.6 GHz, in this design up to 14 GHz) and is fed by a linearly tapered coplanar waveguide (CPW) which provides continuous transitional impedance for enhanced matching (H. Khaleel, H. AlRizzo, D. Rucker, S. Mohan, Antennas and Wireless Propagation Letters, IEEE, vol.11, no., pp.564-567, 2012). An arm structure is added to give rise to a resonance at 2.45 GHz which encompasses the Industrial, Scientific, Medical (ISM) band which includes WLAN. The radiating element and ground plane are printed on a 32 mm x 42 mm kapton polyimide substrate with a thickness of 50.8 m and a dielectric constant of 3.4. A parametric study is conducted to optimize the notch behavior between 2.65 and 3.1 GHz. Excellent radiation characteristics, improved impedance matching, and high efficiency suggest that the antenna is a good candidate for applications that require the integration of cost effective, low profile antennas with UWB and ISM c- nnectivity. The figure below depicts the antenna geometry, all dimensions in millimeter, and the reflection coefficient S11.