【作者】 周媛媛； 苏凯； 惠政桥； 徐云学；

【Author】 ZHOU yuanyuan;SU kai;HUI zhengqiao;XU yunxue;XIDIAN UNIVERSITY;

【机构】 西安电子科技大学；

【摘要】 针对Vivaldi天线小型化时导致天线的方向性减弱及前后比降低的问题,本文通过引入引向器和反射器的方法提高了Vivaldi天线的方向性和前后比。反射器是曲折线结构,设置在Vivaldi天线的侧后方,能够有效地提升低频段及高频段的FTBR。引向器设置在Vivaldi天线的开口槽处,进一步提高天线的方向性。结果表明,所提出的天线在0.7～4GHz(相对带宽为140%)范围内驻波比小于3。在最低工作频率处,峰值增益从2.2 dBi增加至3.9 dBi,FTBR从3.6 dB提升至11.6 dB。在最高工作频率处,FTBR从7.9 dB提升至12.9 dB,平均FTBR提升3 dB。更多还原

【Abstract】 When the Vivaldi antenna is miniaturized,its directivity is weakened,and the front-to-back ratio(FTBR)is reduced.To address this problem,a new Vivaldi antenna using a director and a reflector is proposed.The reflector adopts a zigzag line structure and is positioned at the rear sides of the Vivaldi antenna,effectively enhancing the FTBR in both the low and high frequency bands.The director is placed at the aperture of the Vivaldi antenna,further enhancing the directivity.The results demonstrate that the proposed antenna achieves a voltage standing wave ratio of less than 3 over the frequency range of 0.7～4 GHz(140%).At the lowest operating frequency,the peak gain increases from 2.2 to 3.9 dBi,while the FTBR improves from 3.6 to 11.6 dB.At the highest operating frequency,the FTBR increases from 7.9 to 12,9 dB,with an average FTBR improvement of 3 dB.更多还原