| 摘要: |
| 设计了一副改进的非对称平衡对拓Vivaldi天线。辐射贴片外边缘用3阶多项式曲线修正，以实现很宽的阻抗带宽。在天线口径处嵌入一个金属贴片作引向器以改善天线的辐射特性。对辐射贴片引入非对称性，使得E面波束偏离得到进一步补偿。实测结果表明，该天线具有极宽的工作带宽，在2~40 GHz内的增益大于0 dBi，且在15~30 GHz内的增益大于14 dBi；E面的波束偏离在6~40 GHz频率范围内小于3°。该天线具有结构简单、尺寸紧凑（44 mm×98 mm）以及方向图稳定等优点。该天线能够较好地应用于相控阵、超宽带系统等。 |
| 关键词: 宽带天线 非对称平衡Vivaldi天线 辐射贴片 边缘修正 引向器 |
| DOI： |
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| 基金项目:四川省乐山市科技局重点项目(16GZD028) |
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| Design of an asymmetric balanced antipodal Vivaldi antenna with a director |
| WANG Qiong,SHI Chunhui,XIA Xinlin,WANG Zhong,LI Yong |
| () |
| Abstract: |
| A modified asymmetric balanced antipodal Vivaldi antenna is designed. The outer edges of the radiation patches are modified by a 3-order polynomial curve to achieve an extremely large impedance bandwidth. A metal patch is inserted in the antenna aperture to enhance the radiation characteristics. The beam tilts in E-plane are further compensated by introducing structure asymmetry on radiation patches. The measured results show that the proposed antenna achieves a very wide bandwidth from 2 to more than 40 GHz with peak gain >0 dBi and >14 dBi over the 15~30 GHz frequency range. Moreover,the squinted beam of E-plane is less than 3° from 6 to 40 GHz.The proposed antenna has advantages of simple structure,compact size(44 mm×98 mm),and stable radiation patterns. This antenna can be a good candidate for phased array,ultra-wideband（UWB） system and so on. |
| Key words: wideband antenna asymmetric balanced antipodal Vivaldi antenna radiation flare edge modification director |
