求牛人翻译，不要糊弄我，好歹还能看懂，关于准八木天线的，最好是专业点的，谢谢

八木天线在上个世纪二十年代由日本东北大学的 HidetsuguYagi 和 Shintaro Uda 率先研制，这种天线随即被命名为“八木-宇田天线”，简称“八木天线”。是由一有源振子和若干平行无源振子构成。有源振子可以是谐振长度的半波振子或折合振子，无源振子又称为寄生单元，通过有源振子的近场耦合得到激励。八木天线具有结构简单、造价低廉、重量轻、能提供高增益等特点，是高频-甚高频-超高频波段最通用天线之一，但其频带较窄，只能实现端射辐射，无法直接与载体表面共面安装。Qian等人提出了利用微带技术的准八木天线，天线背面截断的接地面既作为微带本身的反射面，又起到发射振子的作用。这种天线展宽了阻抗带宽，结构紧凑，易于构成阵列和集成到微波电路中，应有前景广阔。 可以实现定向远距离地面宽带通信。准八木型微带天线具有结构简单而紧凑，可以使用微带电路来实现的特点，大大减小了天线单元的体积和重量，扩大了八木天线的应用范围。

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.