A Modified Leaf Shaped Antipodal Vivaldi Antenna for UWB with WLAN Band-Notched Characteristics

This paper features about compact and efficient modified leaf shaped antipodal Vivaldi antenna for UWB (3.1-10.6 GHz) and Band-notched characteristics for WLAN (5.15-5.725 GHz) applications, with the help of EBG structures in the form of square split ring resonators (SSRR). As a result of it, a dual-operation is achieved for WLAN notching with coverage of WiMAX and Terrestrial applications. Further, the proposed antenna is interpreted with EM based optimization techniques. Genetic Algorithm was implemented for optimizing dimensions of SSRR, in perspective of achieving band-notching at WLAN. The proposed antenna is fed by a 50 Omega microstrip line and low cost FR-4 substrate is used, with the volumetric antenna size of 36 x 28 x 1.6 mm(3). All the evaluation metrics of the antenna are evaluated using ANSYS-HFSS, their corresponding outcomes are reported in the corresponding sections. The input reflection coefficient (S-11) is <= -10 dB from 3.1-10.6 GHz except at 4.5-6 GHz, covering the WLAN Band (5.15-5.725 GHz). MLSAVA shows flatness in acceptable realized gain, wide bandwidth and omnidirectional radiation pattern over WLAN & UWB bands.