Dual-Polarized Microstrip Yagi Antenna Based on Coaxial Back Feed

This paper proposes a dual-polarized microstrip Yagi antenna based on coaxial back feed. Two truncated microstrip dipoles are placed orthogonally on the same plane as the driving elements, and shortened probes are applied to eliminate the feed balun, which greatly simplifies the antenna structure and the manufacturing complexity. The simulated results show that the proposed antenna has an impedance bandwidth of 12.5% (S11<; -10dB), radiates a tilted beam of 26° with a good polarization purity.