超宽带榕树天线阵列设计

传统的超宽带天线体积大、重量沉、成本高、需要复杂的巴伦，为了设计一种2~7 GHz的低剖面低成本的超宽带侦察天线阵列，文中采用新型的榕树天线形式，对无限大的榕树天线阵列进行仿真优化。阵元采用SMA接头馈电，通过调整阵元尺寸，无限大榕树天线阵列工作带宽达到1.7~7.3 GHz。构造一个8×8有限大阵列，对最内部两层阵元馈电，增益的方向性相对单天线增强较多。仿真结果证明，榕树天线阵列可以实现2~7 GHz的超宽带，并且剖面高度只有最大波长的1/2，适合制作超宽带侦察天线阵列。

Design of Ultra-wideband Banyan Tree Antenna Array

Conventional ultra-wideband antenna is large, heavy, costly, and need complicated Barron. In order to design a 2~7 GHz low-profile, low-cost, ultra-wideband reconnaissance array, we need to adopt new forms of banyan tree antenna (BTA). Firstly, infinite BTA array is simulated and optimized. Array elements are feed by SMA connectors. Operating bandwidth of the infinite BTA array can reach 1.7~7.3 GHz, by adjusting the size of the array elements. An 8×8 finite array is configured. And two internal layers of elements are fed. Directivity of gain of 8×8 finite array is stronger than single antenna. Eventually come to the conclusion: BTA array can achieve ultra-wide band of 2~7 GHz .And BTA array is easy to implement , low-profile, and suitable for the production of ultra-wideband reconnaissance array.