Antipodal Vivaldi Array for Reconfigurable Aperture-Level In-Band Full-Duplex

This paper presents an 8-element linear Antipodal Vivaldi antenna array from 8 to 18 G Hz designed for aperture-level in-band full-duplex operation. The array is designed to be manufactured from a single substrate, with separate feed lines at each element to allow for a completely reconfigurable system. At 10 GHz the antenna element has a width of <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$3\lambda/4$</tex>, corresponding to the spacing between elements, allowing for scanning up to 20°. For <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$\vert S_{11}\vert &lt; -10\mathbf{dB}$</tex> or better with a width below <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$\lambda$</tex> for the antenna element, corrugations are added. With all 8-elements, the simulated array demonstrates a gain of 15 dB to 18 dB, and a front-to-back ratio of 16.5 dB or better.