关键词: 超宽带天线, 榕树天线, 共模谐振, 不平衡馈电锥削偶极子阵元, 榕树天线阵列

Abstract:

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.

Key words: ultra wideband antenna;banyan tree antenna;common mode resonance;unbalanced excitation of balanced tapered dipole element;banyan tree antenna array