  In this work, a method is presented to maximize the obtained gain from
millimeter-wave (mm-wave) lens antennas using phase center analysis. Commonly,
for designing a lens antenna, the lens is positioned just on top of the antenna
element which is not capable of providing the maximum gain/aperture efficiency.
A novel solution method is proposed where the lens will be placed at a distance
calculated using phase center analysis to produce the maximum gain from the
system. A mm-wave microstrip antenna array is designed and the proposed method
is applied for the gain enhancement. Simulation results suggest that the
propose scheme obtains around 25% gain enhancement compared to the traditional
method.
