一种基于接收天线阵列的宽带吸波层设计

A wideband absorber screen design method based on receiving antenna array

提出了一种基于宽频带天线设计吸波层的方法.根据接收天线与吸波结构工作原理的相似性,选取了一种磁电偶极子宽频带天线为原始模型,以吸波层的吸波原理为理论依据,对宽频带接收天线进行改进,并运用HFSS软件对其几何参数进行仿真与优化,得到了一种厚度薄且吸波频段宽的吸波层.加工与测试结果表明:6×6单元吸波层10dB吸波带宽为1.54~3.31GHz,相对带宽为73%,其厚度低于工作频段中心频点自由波长的1/9.由于所设计的吸波层结构具有对称性,它可以工作在双极化条件下.

This paper designs a method of wideband absorber screen based on the receiving antenna technique. A dual-polarized magneto-electric dipole antenna is selected as original model according to the similarities of working principle between the receiving antenna and absorber. The antenna is improved by the wave-absorbing mechanism to the original absorber. The geometric parameters of the absorber cells are simulated and optimized by the HFSS software to accomplish the thin profile and broadband absorber screen. The measured results show that the finite 6）〈 6 array absorber screen provides a 10 dB RCS reduc- tion over the entire frequency range of 1.54--3.31GHz, which is equivalent to a relative bandwidth of 73%. The thickness of substrate is below 1/9 wavelength of the center frequency in free space. The ab- sorber screen can also be used in dual polarization because of its symmetrical property.