A Printed High Gain UWB Vivaldi Antenna Design Using Tapered Corrugation and Grating Elements

摘要

A compact Vivaldi antenna is proposed with high gain over the ultrawidebandrn(UWB) using novel combination of corrugation and grating elements. As it is very intricaternto improve the radiation characteristics such as gain throughout the UWB using single technique,rntherefore, corrugation at the flares and grating elements in the area of tapered slotrnare used to improve gain over the UWB. Due to the corrugation, the gain and front-to-backrnratio improved significantly over 3–8 GHz whereas the effect of grating elements isrnobserved over 8 GHz. The antenna operates for 2.9 GHz to more than 12 GHz withrnS_11 <10 dB and is designed on 0.8-mm thick low cost FR4 substrate (40 mm × 45 mm).rnThe proposed antenna shows nearly stable unidirectional radiation patterns, peak realizedrngain more than 5 dBi, and front-to-back ratio better than 10 dB over the UWB. Furthermore,rnthe time domain study of the antenna is carried out which shows good pulse handlingrncapability with nearly flat group delay.