A hybrid thin film multilayer antenna for automotive radar is presented in this work. A 2×8 aperture coupled stacked patch antenna array is realized on a single layer printed circuit board (PCB) using a novel thin film based approach. Using a compact 180 • phase difference power divider, interelement spacing in a 2×2 sub-array is reduced. Measurement results show a 19% (67.9-82.5 GHz) impedance bandwidth and a wideband broadside radiation pattern, with a maximum gain of 15.4 dBi realized gain at 72 GHz. The antenna can be employed in mid-range automotive radar applications. Index Terms-Aperture-coupled antenna, millimeter-wave antennas, microstrip antennas, grounded coplanar waveguide, biphase power divider