||Design and Analysis of a UWB Slotted Vivaldi Antenna for Microwave Imaging Applications
||(Liton Chandra Paul) ; (Akash Majumder) ; (Tithi Rani) ; (Md. Najmul Hossain) ; (Md. Abdur Rahim) ; (Jungpil Shin) ; (Keun Soo Yun)
|| Compact Vivaldi antenna; UWB; Microwave imaging; Resonant cavity; Radial stub
||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 mm3 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 cross-validation, and the results were equally good. In conclusion, the proposed compact Vivaldi antenna is a good option for microwave imaging applications.