Organic Substrate Based D-Band Vivaldi Antenna for End-Fire Applications

Vivaldi antennas with relatively wide bandwidth and reasonable radiation characteristics can find the applications for D band. This paper shows the characteristics of single unit cell of Vivaldi antenna, fed by stripline, having two radiating flares with organic dielectric in between them contrary to anti-podal configuration. In addition to dual radiating fins, a hexagonal director and uniform cylindrical slots were added to enhance the directive performance of the antenna. Antenna shows a broad matching characteristics with bandwidth of 110–166 GHz, with a peak gain of 9.47 dBi at 166 GHz. Effects of thickening the substrate and excitation with <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$100-\mu \mathrm{m}$</tex> ground-signal-ground (GSG) probe pads are studied using printed circuit board (PCB) technology. Single unit shows a promising potential for the D-band antenna array applications.