Dual-Band Notched Wide-Slot UWB Antenna For Low-Cost RFID Applications

A dual-band notched wide-slot UWB antenna is presented. The proposed structure has an impedance bandwidth of 10.5 GHz, starting from 2.03 GHz to 12.5 GHz -covering the entire UWB range of frequencies (3.1 GHz to 10.6 GHz). Along with the UWB response, two notch bands are incorporated using H-shaped stepped impedance resonators to minimize interference from the free license bands (namely the WLAN, and the NATO frequencies) of operations and to ensure a better applicability for the industries. The gain of the structure was found to remain invariant over the operating frequencies except at the notch bands where it suffered a sharp decrement. The surface currents and the input impedance of the proposed configuration were analyzed to comment on the band-notched characteristics and to explain the role of the H-shaped resonators in the context. The simplicity of the design geometry and the reduced space requirements, qualify the proposed structure for low-cost RFID applications as well as for other UWB systems.