A Polarization Reconfigurable Beam Scanning Antenna Based on Stacked Microstrip Antenna Array

This paper presents a polarization reconfigurable beam scanning antenna based on stacked microstrip antenna. The feed antenna is a three-dimensional stacked microstrip-Yagi antenna array. The structural parameters and the number of directors can be rationally designed by using the coupling between the directors and the microstrip antenna. The final design of the microstrip-Yagi antenna with three directors achieves a remarkable extension of the relative bandwidth from 4.6% of the original patch antenna to 21.2%. The gain is in the range of 8.7 dB–10.4 dB over the entire operating band. On this basis, the layout of the feed array is designed. The current distribution analysis reveals a weak coupling between the array units. Furthermore, the radiation pattern performance with different ports is simulated and analyzed. Finally, according to the principle of reflector antenna, the reflector structure is designed, and the beam scanning is realized by the feeding mode of deflection.