小型宽频带双极化电磁兼容性测试天线的设计与实现

Design and Implementation of the Compact Wideband Dual-polarized Antenna for Electromagnetic Compatibility Test

为解决飞行器舱段等特定狭小空间内的电磁兼容性(Electromagnetic Compatibility,EMC)现场测试需求,设计与实现一款新型的小型宽频带双极化EMC测试天线。基于传统Vivaldi天线性能分析,采用修型设计并优化天线表面电流分布,设计一款新型宽频带单极化天线;运用非对称双极化设计方法,并组合两幅新型单极化天线,设计一款高隔离度的双极化EMC测试天线。仿真分析和实测结果表明:双极化EMC测试天线的工作频带为0.33~3.40 GHz(电压驻波比小于2),工作频带内天线方向图无裂瓣且增益平坦,天线系数达到17~36 dB/m,双端口隔离度优于35 dB;双极化EMC测试天线的尺寸为450 mm×450 mm×450 mm,适用于飞行器舱段等狭小空间内EMC辐射发射现场测试,有助于测试效率提升。

In order to solve the electromagnetic compatibility(EMC)testing problem in specific scenarios such as aircraft cabin,a novel compact wideband dual-polarized antenna is designed and implemented to meet the requirements of EMC test in a small space.Based on the performance analysis of the traditional Vivaldi antenna,a new wideband single-polarized antenna is designed by improving the shape and optimizing the surface current distribution of the traditional antenna.A high isolation dual-polarized EMC test antenna is designed by combining two single-polarized antennas and adopting an asymmetric dual-polarized design method.The simulated and measured results show that the operating frequency band of the antenna is 0.33-3.40 GHz(VSWR<2),the directional pattern has no split lobe,the gain is flat in the whole frequency band,the antenna factor reaches 17-36 dB/m and the 2-port isolation is above 35 dB.The dimension of the combined antenna is 450×450×450 mm 3,which meets the requirements of the system-level EMC radiation emission test and contributes to enhancing the test efficiency.