Ultra - Wideband antenna enhancement with reconfiguration and notching techniques evaluation

Abstract

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 2.8GHz 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.