Design and Analysis of a UWB Slotted Vivaldi Antenna for Microwave Imaging Applications
Liton Chandra Paul, Majumder Akash, Rani Tithi, Hossain Najmul, Rahim Abdur, Jungpil Shin, Keun Soo Yun
Abstract
An ultra-wideband (UWB) slotted compact Vivaldi antenna with a microstrip line feed was evaluated for microwave imaging (MI) applications. The recommended FR4 substrate-based Vivaldi antenna is 50×50×1.5 ㎣ in size. The proposed compact Vivaldi antenna showed good radiation characteristics and spanned an ultra-wide bandwidth of 10 GHz, ranging from 3.6 to 13.6 GHz, using a microstrip line feed with a radial stub, tapered slots, and resonant cavities. After analyzing the simulation findings, the proposed compact slotted UWB Vivaldi antenna was compared with the basic Vivaldi antenna. The maximum gain and efficiency were 7.35 dB and 82%, respectively. The antenna was simulated in the time domain using the computer simulation technology (CST) microwave studio. The frequency domain solver was also used for crossvalidation, and the results were equally good. In conclusion, the proposed compact Vivaldi antenna is a good option for microwave imaging applications.