An Improved Vivaldi Antenna Design for Through- Wall Radar Imaging

Abstract

This paper presents an improved Vivaldi antenna design for Through Wall Radar Imaging (TWRI). It is one of the most emerging radar technologies that has different applications in real-life situations. Radar uses EM waves to penetrate through the wall, and then detects the objects behind the wall. Antenna plays a very important role in TWRI system. Vivaldi antenna can be used as an ideal candidate for this system. The antenna presented here operates from the frequency 2.5 GHz to 11.3 GHz and shows a constant radiation pattern in the operating bandwidth. The gain obtained is around 6 dBi. The effect of various antenna parameters are also studied in this paper. Furthermore, corrugations and grating elements are added to analyze the effects on gain and bandwidth. With the above enhancements in design, a bandwidth of 8.8 GHz and an improved gain of around 9.6 dBi has been achieved.