Ultra‐broadband function‐integrated stealth antenna based on asymmetric transmission metasurface

Abstract

Integration and stealth performance of the antenna system can meet the requirements of modern warfare for communication systems, and significantly improve the survivability of equipment. However, there are still huge difficulties in function-integrated stealth antennas design. In this article, an ultrabroadband function-integrated stealth antenna system is designed based on asymmetric transmission metasurface (ATMS). By the 45 inclined horn antenna exciting the ATMS, the antenna system achieves stable ultrabroadband high-gain directional radiation and frequency scanning function in transmission and the reflection mode respectively. And the ATMS can scatter the y-polarized reflected wave to achieve in-band stealth of the antenna system when y-polarized wave illuminates the ATMS from backside. The experimental results show that the RCS of the antenna system can be reduced more than 10 dB between 11.6 and 20 GHz (relative bandwidth is 53.2%). In addition, the 3 dB gain relative bandwidth of the directional antenna is 57.1% (10-18 GHz). And the 3 dB gain relative bandwidth of the frequency scanning antenna is 62.3% . This strategy has broad application prospects in communication systems and large-scale integrated devices.