A Compact Asymmetrically Slotted Antipodal Vivaldi Antenna for MIMO Imaging Systems.

Abstract

In this paper, we propose a Compact Asymmetrically Slotted Antipodal Vivaldi Antenna (CAS-AVA) design for MIMO imaging systems. The structure has the ability to extend the antenna bandwidth in low-end frequencies achieving a fractional bandwidth of 123,32 % (4.743-20 GHz). Good results are obtained in term of return loss, radiation pattern and gain. A time-domain study has been also performed to characterize the antenna behavior in case of an UWB pulse is used. To further validate our design, an application for MIMO imaging system is also proposed and evaluated. The antenna performances demonstrate that it is a good candidate for microwave imaging applications.

An improved gain and directivity design of an antipodal Vivaldi antenna for ultra‐wideband detection

“…An exponential slot AVA was designed in Guo et al 10 and Paul et al 11 However, the bandwidth was discontinuous after slotting. Similarly, AVAs with corrugations for microwave imaging, 12 AVA with several rectangular slots for radar, 13 an AVA with corrugations and elliptical‐shaped slots for microwave and millimeter‐wave applications, 14 an AVA with petal‐shaped slots, 15 a VA with electromagnetic band gap slots, 16 asymmetrically slotted AVA, 17 VA with quarter‐oval narrow slits, 18 AVA with single semicircular slot, 19 and a palm tree‐shaped VA 20 were proposed to enable. Another way to improve the bandwidth characteristics is to load resistors, such as AVAs in Xie et al 21 and Zhao et al 22 …”