Ultra–Wideband Antenna Enhancement with Reconfiguration and Notching Techniques Evaluation

Many researchers have proposed notches and strips for band ‎enhancement or ‎interference reduction of ultra‎–‎wideband (UWB) antenna. Previous studies ‎illustrated the ‎advantage of using slot technologies and strips to change the ‎antenna impedance matching. ‎This study presents a comprehensive overview of ‎the performances of reconfiguration techniques on UWB ‎antennas based on filtering ‎and matching band. Several studies are considered, and ‎the performance of ‎antennas designs that applied slot, strips, parasitic ‎stubs, and spiral loop ‎resonators are compared. Unwanted bands, ‎such as WLAN and WiMAX ‎systems, are interfered with UWB communications. ‎The notches are used for ‎either band rejection or bandwidth enhancement. ‎Moreover, a hexagonal UWB ‎patch antenna with the coplanar waveguide is demonstrated in this paper. The ‎improvement of the UWB antenna bandwidth is realised by incising the patch ‎size. Loading two L-shape strips on the radiation patch achieved band rejection at 5.15 GHz. The simulated parametric study represents different results achieved with ‎different side–‎patch lengths. The best achievements of the proposed design are the ‎UWB bandwidth from 2.8 GHz to 11.5 GHz, and the radiation gain of 4 dB at ‎‎5.8 GHz. Good omnidirectional radiation patterns observe on E-plane by ‎bidirectional patterns provide on H-plane. Finally, the performance and ‎implementing the studied UWB antennas are discussed in details.‎