Yagi antenna in last centuries twenty time by Tohoku University Japan's HidetsuguYagi and Shintaro Uda took the lead in research, the antenna was named" Yagi-Uda antenna", referred to as" Yagi antenna". Is composed of an active vibrator and a plurality of parallel passive dipoles. An active vibrator can be resonant length of the half wave vibrator or folding vibrator, passive dipoles also known as parasitic unit, through the active oscillator in the near field coupling inspired. Yagi antenna has the advantages of simple structure, low cost, light weight, can provide high gain and other characteristics, is the high frequency VHF UHF band antenna - the most common one, but the band is narrow, can only achieve the end-fire radiation, not directly with the carrier surface coplanar mounting. Qian et al proposed using microstrip technology Quasi-Yagi antenna, antenna back truncated ground itself both as microstrip reflective surface, but also plays a role of transmitting oscillator. The antenna impedance bandwidth broadening, compact structure, easy to constitute array and integrated into the microwave circuit, should have broad prospects. Can achieve directional distance ground broadband communication. Quasi Yagi type microstrip antenna has simple and compact structure, can use the microstrip circuit to achieve the characteristics, greatly reducing the volume and the weight of the antenna unit, expanded the Yagi antenna applications. Yagi antenna in last centuries twenty time by Tohoku University Japan's HidetsuguYagi and Shintaro Uda took the lead in research, the antenna was named" Yagi-Uda antenna", referred to as" Yagi antenna". Is composed of an active vibrator and a plurality of parallel passive dipoles. An active vibrator can be resonant length of the half wave vibrator or folding vibrator, passive dipoles also known as parasitic unit, through the active oscillator in the near field coupling inspired. Yagi antenna has the advantages of simple structure, low cost, light weight, can provide high gain and other characteristics, is the high frequency VHF UHF band antenna - the most common one, but the band is narrow, can only achieve the end-fire radiation, not directly with the carrier surface coplanar mounting. Qian et al proposed using microstrip technology Quasi-Yagi antenna, antenna back truncated ground itself both as microstrip reflective surface, but also plays a role of transmitting oscillator. The antenna impedance bandwidth broadening, compact structure, easy to constitute array and integrated into the microwave circuit, should have broad prospects. Can achieve directional distance ground broadband communication. Quasi Yagi type microstrip antenna has simple and compact structure, can use the microstrip circuit to achieve the characteristics, greatly reducing the volume and the weight of the antenna unit, expanded the Yagi antenna applications.