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为了缩减天线带内雷达散射截面(radar cross section,RCS),在双频带完美吸波材料的基础上,通过缩小两吸波率峰值之间的距离,设计出了一种频带较宽的超薄完美吸波体.该吸波体由两层金属及其中间的有耗介质组成,底面金属不刻蚀,顶面由方形贴片和绕其四周的开口方环组成,该结构具有低频点LC谐振和高频点偶极子谐振的特征.仿真和实验结果表明:该吸波体具有极化不敏感和宽入射角的特征,其在厚度小于0.01λ的条件下,具有8.2%的半波功率相对带宽,最大吸波率的峰值为91.6%和96.5%.将吸波体用于圆极化的倾斜波束(tilted beam,TB)天线,仿真和测试结果表明:该天线在保持增益不变的条件下,不仅轴比得到改善,有效带宽得到拓展,且在5.5—6.5GHz范围内TB天线的RCS缩减至少在3dBsm以上,在谐振频点处最大缩减幅度分别为11dBsm和8dBsm;在两谐振点处鼻锥方向36°—+36°范围内,TB天线的RCS缩减均有明显效果.
In order to reduce the radar cross section (RCS) in the antenna, based on the dual-band perfect absorbing material, by narrowing the distance between two peaks of the absorbing rate, a wide-band ultra-thin Perfect absorbing body.The absorbing body consists of two layers of metal and the middle of the lossy medium composition, the bottom of the metal is not etching, the top of the square patch and around the opening around the square ring composition, the structure has a low frequency point LC Resonance and high-frequency point dipole resonance.The simulation and experimental results show that the wave absorber has the characteristics of polarization insensitivity and wide angle of incidence, and has a half-wave of 8.2% at a thickness of less than 0.01λ The maximum relative power absorption bandwidth of the antenna is 91.6% and 96.5%, respectively. The wave absorber is applied to a circularly polarized tilted beam (TB) antenna. The simulation and test results show that the antenna maintains constant gain , Not only the axial ratio is improved but the effective bandwidth is expanded. The RCS reduction of TB antenna in the range of 5.5-6.5GHz is at least over 3dBsm, and the maximum reduction amplitude at the resonance frequency point is 11dBsm and 8dBsm respectively. Point nose cone direction 36 ° - + 36 ° range, TB antenna RCS were significantly reduced effect.