基于多模态超表面的无天线罩隐身阵列天线

Aiming at the difficult problem that satellite-borne antennas cannot achieve stealth through radomes, this paper innovatively proposes a satellite-borne radome-free self-stealth antenna. By using the principle of multimode resonance and the differentiated excitation method, a multimodal electromagnetic hypersurface with single-modal broadband stealth, dual-modal stealth-reflection and dual-modal stealth-radiation characteristics is constructed, and then a radiation-stealth integrated antenna is designed. The measured results show that significant reduction in radar cross section (RCS) is achieved in the out-of-band absorption bands of 3.05 — 4. 95 GHz and 6. 4—10. 5 GHz; within the frequency ränge of 5. 7 — 6. 15 GHz, the axial ratio is lower than 3 dB, and the gain of the antenna is 15. 3 dBi. The designed radome-free integrated stealth circularly polarized array antenna has the characteristics of out-of-band RCS reduction characteristics and good in-band circularly polarized radiation Performance.